diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5207860..dff1e76 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,8 @@ set(MODULE_VERSION_MINOR 0)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
+set(CMAKE_CXX_STANDARD 23)
+
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Release)
 endif()
@@ -23,15 +25,28 @@ endif()
 
 configure_file(WallReel/version.h.in ${CMAKE_BINARY_DIR}/generated/version.h)
 
-find_package(Qt6 REQUIRED COMPONENTS Quick Widgets QuickControls2 Concurrent)
+find_package(Qt6 REQUIRED COMPONENTS Quick Widgets QuickControls2 Concurrent Test)
 
 qt_standard_project_setup(REQUIRES 6.5)
 
 qt_policy(SET QTP0004 NEW)
 
+option(BUILD_TESTING "Build the testing tree." ON)
+option(ADDRESS_SANITIZER "Enable Address Sanitizer for debugging." OFF)
+
 add_subdirectory(WallReel/Core)
 add_subdirectory(WallReel/UI)
 
+if(BUILD_TESTING)
+    enable_testing()
+    add_subdirectory(Tests)
+endif()
+
+if(ADDRESS_SANITIZER)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address -g")
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=address")
+endif()
+
 add_executable(${EXECUTABLE_NAME}
     WallReel/main.cpp
 )
diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
new file mode 100644
index 0000000..fe77169
--- /dev/null
+++ b/Tests/CMakeLists.txt
@@ -0,0 +1,40 @@
+
+project(Tests LANGUAGES CXX)
+
+find_package(Qt6 REQUIRED COMPONENTS Core Test)
+
+add_executable(tst_configmgr
+    tst_configmgr.cpp
+)
+
+add_executable(tst_imagemodel
+    tst_imagemodel.cpp
+)
+
+add_test(NAME tst_configmgr COMMAND tst_configmgr)
+add_test(NAME tst_imagemodel COMMAND tst_imagemodel)
+
+target_link_libraries(tst_configmgr PRIVATE
+    Qt6::Core
+    Qt6::Test
+    Qt6::Gui
+    wallreel-core
+)
+
+target_link_libraries(tst_imagemodel PRIVATE
+    Qt6::Core
+    Qt6::Test
+    Qt6::Gui
+    Qt6::Quick
+    wallreel-core
+)
+
+target_include_directories(tst_configmgr PRIVATE
+    ${CMAKE_SOURCE_DIR}/WallReel/Core
+    ${CMAKE_BINARY_DIR}/generated
+)
+
+target_include_directories(tst_imagemodel PRIVATE
+    ${CMAKE_SOURCE_DIR}/WallReel/Core
+    ${CMAKE_BINARY_DIR}/generated
+)
diff --git a/Tests/tst_configmgr.cpp b/Tests/tst_configmgr.cpp
new file mode 100644
index 0000000..91a674e
--- /dev/null
+++ b/Tests/tst_configmgr.cpp
@@ -0,0 +1,396 @@
+#include <QtGui/qcolor.h>
+
+#include <QFile>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QSignalSpy>
+#include <QTemporaryDir>
+#include <QTest>
+
+#include "configmgr.hpp"
+
+class TestConfigMgr : public QObject {
+    Q_OBJECT
+
+  private slots:
+    void initTestCase();
+    void cleanupTestCase();
+
+    void testDefaults();
+    void testFullConfigParsing();
+    void testInvalidConfigValues();
+    void testWallpaperScanRecursive();
+    void testWallpaperScanNonRecursive();
+    void testWallpaperExcludes();
+    void testExplicitPaths();
+    void testImageExtensions();
+    void testSortTypes();
+
+  private:
+    QTemporaryDir m_tempDir;
+    QString m_configPath;
+    QString m_wallpaperRoot;
+
+    void writeConfig(const QJsonObject& json);
+    void createDummyFile(const QString& relPath);
+};
+
+void TestConfigMgr::initTestCase() {
+    QVERIFY(m_tempDir.isValid());
+    m_configPath    = m_tempDir.path() + "/config.json";
+    m_wallpaperRoot = m_tempDir.path() + "/wallpapers";
+    QDir().mkpath(m_wallpaperRoot);
+}
+
+void TestConfigMgr::cleanupTestCase() {
+}
+
+void TestConfigMgr::writeConfig(const QJsonObject& json) {
+    QFile configFile(m_configPath);
+    QVERIFY(configFile.open(QIODevice::WriteOnly));
+    configFile.write(QJsonDocument(json).toJson());
+    configFile.close();
+}
+
+void TestConfigMgr::createDummyFile(const QString& relPath) {
+    QString absPath = m_wallpaperRoot + "/" + relPath;
+    QFileInfo fi(absPath);
+    QDir().mkpath(fi.absolutePath());
+    QFile file(absPath);
+    QVERIFY(file.open(QIODevice::WriteOnly));
+    file.write("foobar");
+    file.close();
+}
+
+void TestConfigMgr::testDefaults() {
+    // Empty config file
+    writeConfig(QJsonObject());
+
+    Config config(m_tempDir.path(), {}, m_configPath);
+
+    // Check Style Defaults
+    QCOMPARE(config.getImageWidth(), 320);
+    QCOMPARE(config.getImageHeight(), 200);
+    QCOMPARE(config.getImageFocusScale(), 1.5);
+    QCOMPARE(config.getWindowWidth(), 750);
+    QCOMPARE(config.getWindowHeight(), 500);
+
+    // Check Sort Defaults
+    QCOMPARE(config.getSortConfig().type, Config::SortType::Name);
+    QCOMPARE(config.getSortConfig().reverse, false);
+
+    // Check Action Defaults
+    QCOMPARE(config.getActionConfig().previewDebounceTime, 300);
+    QCOMPARE(config.getActionConfig().printSelected, false);
+    QCOMPARE(config.getActionConfig().printPreview, false);
+    QVERIFY(config.getActionConfig().onSelected.isEmpty());
+    QVERIFY(config.getActionConfig().onPreview.isEmpty());
+    QVERIFY(config.getActionConfig().onRestore.isEmpty());
+    QVERIFY(config.getActionConfig().saveState.isEmpty());
+}
+
+void TestConfigMgr::testFullConfigParsing() {
+    QJsonObject root;
+
+    // Wallpaper settings
+    QJsonObject wallpaperObj;
+    QJsonArray dirsArray;
+    QJsonObject dir1;
+    dir1["path"]      = "/tmp/w1";
+    dir1["recursive"] = true;
+    dirsArray.append(dir1);
+    wallpaperObj["dirs"] = dirsArray;
+
+    QJsonArray pathsArray;
+    pathsArray.append("/tmp/p1.jpg");
+    wallpaperObj["paths"] = pathsArray;
+
+    QJsonArray excludesArray;
+    excludesArray.append(".*bad.*");
+    wallpaperObj["excludes"] = excludesArray;
+
+    root["wallpaper"] = wallpaperObj;
+
+    // Palette
+    QJsonArray palettesArray;
+    QJsonObject palette1;
+    palette1["name"] = "Default";
+    QJsonArray colorsArray;
+    QJsonObject color1;
+    color1["name"]  = "Red";
+    color1["value"] = "#FF0000";
+    colorsArray.append(color1);
+    palette1["colors"] = colorsArray;
+    palettesArray.append(palette1);
+    root["palettes"] = palettesArray;
+
+    // Action
+    QJsonObject actionObj;
+    actionObj["printSelected"] = true;
+    actionObj["onSelected"]    = "echo {{ path }}";
+    root["action"]             = actionObj;
+
+    // Style
+    QJsonObject styleObj;
+    styleObj["image_width"]  = 100;
+    styleObj["image_height"] = 100;
+    root["style"]            = styleObj;
+
+    // Sort
+    QJsonObject sortObj;
+    sortObj["type"]    = "date";
+    sortObj["reverse"] = true;
+    root["sort"]       = sortObj;
+
+    writeConfig(root);
+    Config config(m_tempDir.path(), {}, m_configPath);
+
+    // Assertions
+    QCOMPARE(config.getWallpaperConfig().dirs.size(), 1);
+    QCOMPARE(config.getWallpaperConfig().dirs[0].path, "/tmp/w1");
+    QCOMPARE(config.getWallpaperConfig().dirs[0].recursive, true);
+
+    QCOMPARE(config.getWallpaperConfig().paths.size(), 1);
+    QCOMPARE(config.getWallpaperConfig().paths[0], "/tmp/p1.jpg");
+
+    QCOMPARE(config.getWallpaperConfig().excludes.size(), 1);
+    QCOMPARE(config.getWallpaperConfig().excludes[0].pattern(), ".*bad.*");
+
+    QCOMPARE(config.getPaletteConfig().palettes.size(), 1);
+    QCOMPARE(config.getPaletteConfig().palettes[0].name, "Default");
+    QCOMPARE(config.getPaletteConfig().palettes[0].colors.size(), 1);
+    QCOMPARE(config.getPaletteConfig().palettes[0].colors[0].name, "Red");
+    QCOMPARE(config.getPaletteConfig().palettes[0].colors[0].value.name().toLower(), "#ff0000");
+
+    QCOMPARE(config.getActionConfig().printSelected, true);
+    QCOMPARE(config.getActionConfig().onSelected, "echo {{ path }}");
+
+    QCOMPARE(config.getImageWidth(), 100);
+    QCOMPARE(config.getImageHeight(), 100);
+
+    QCOMPARE(config.getSortConfig().type, Config::SortType::Date);
+    QCOMPARE(config.getSortConfig().reverse, true);
+}
+
+void TestConfigMgr::testInvalidConfigValues() {
+    QJsonObject root;
+    QJsonObject styleObj;
+    styleObj["image_width"] = "not a number";  // Should be ignored
+    root["style"]           = styleObj;
+
+    QJsonObject sortObj;
+    sortObj["type"] = "invalid_type";
+    root["sort"]    = sortObj;
+
+    writeConfig(root);
+    Config config(m_tempDir.path(), {}, m_configPath);
+
+    // Should retain defaults
+    QCOMPARE(config.getImageWidth(), 320);
+    QCOMPARE(config.getSortConfig().type, Config::SortType::Name);
+}
+
+void TestConfigMgr::testWallpaperScanRecursive() {
+    // Setup files
+    createDummyFile("rec/root.jpg");
+    createDummyFile("rec/sub/deep.png");  // should be found
+    createDummyFile("rec/ignore.txt");    // should be ignored
+
+    QJsonObject root;
+    QJsonObject wallpaperObj;
+    QJsonArray dirsArray;
+    QJsonObject dirConfig;
+    dirConfig["path"]      = m_wallpaperRoot + "/rec";
+    dirConfig["recursive"] = true;
+    dirsArray.append(dirConfig);
+    wallpaperObj["dirs"] = dirsArray;
+    root["wallpaper"]    = wallpaperObj;
+
+    writeConfig(root);
+    Config config(m_tempDir.path(), {}, m_configPath);
+
+    QStringList wallpapers = config.getWallpapers();
+    QCOMPARE(wallpapers.size(), 2);
+
+    // Sort to verify presence
+    wallpapers.sort();
+    // Paths are absolute
+    QVERIFY(wallpapers[0].endsWith("root.jpg"));
+    QVERIFY(wallpapers[1].endsWith("deep.png"));
+}
+
+void TestConfigMgr::testWallpaperScanNonRecursive() {
+    createDummyFile("nonrec/root.jpg");
+    createDummyFile("nonrec/sub/deep.png");
+
+    QJsonObject root;
+    QJsonObject wallpaperObj;
+    QJsonArray dirsArray;
+    QJsonObject dirConfig;
+    dirConfig["path"]      = m_wallpaperRoot + "/nonrec";
+    dirConfig["recursive"] = false;
+    dirsArray.append(dirConfig);
+    wallpaperObj["dirs"] = dirsArray;
+    root["wallpaper"]    = wallpaperObj;
+
+    writeConfig(root);
+    Config config(m_tempDir.path(), {}, m_configPath);
+
+    QStringList wallpapers = config.getWallpapers();
+    QCOMPARE(wallpapers.size(), 1);
+    QVERIFY(wallpapers[0].endsWith("root.jpg"));
+}
+
+void TestConfigMgr::testWallpaperExcludes() {
+    createDummyFile("excl/good.jpg");
+    createDummyFile("excl/bad.jpg");
+
+    QJsonObject root;
+    QJsonObject wallpaperObj;
+    QJsonArray dirsArray;
+    QJsonObject dirConfig;
+    dirConfig["path"]      = m_wallpaperRoot + "/excl";
+    dirConfig["recursive"] = false;
+    dirsArray.append(dirConfig);
+    wallpaperObj["dirs"] = dirsArray;
+
+    QJsonArray excludes;
+    excludes.append(".*bad\\.jpg$");
+    wallpaperObj["excludes"] = excludes;
+
+    root["wallpaper"] = wallpaperObj;
+
+    writeConfig(root);
+    Config config(m_tempDir.path(), {}, m_configPath);
+
+    QStringList wallpapers = config.getWallpapers();
+    QCOMPARE(wallpapers.size(), 1);
+    QVERIFY(wallpapers[0].endsWith("good.jpg"));
+}
+
+void TestConfigMgr::testExplicitPaths() {
+    createDummyFile("explicit/a.jpg");
+    QString absPath = m_wallpaperRoot + "/explicit/a.jpg";
+
+    QJsonObject root;
+    QJsonObject wallpaperObj;
+    QJsonArray pathsArray;
+    pathsArray.append(absPath);
+    wallpaperObj["paths"] = pathsArray;
+    root["wallpaper"]     = wallpaperObj;
+
+    writeConfig(root);
+    Config config(m_tempDir.path(), {}, m_configPath);
+
+    QStringList wallpapers = config.getWallpapers();
+    QCOMPARE(wallpapers.size(), 1);
+    QCOMPARE(wallpapers[0], absPath);
+}
+
+void TestConfigMgr::testImageExtensions() {
+    createDummyFile("ext/image1.jpg");
+    createDummyFile("ext/image2.jpeg");
+    createDummyFile("ext/image3.png");
+    createDummyFile("ext/image4.bmp");
+    createDummyFile("ext/text.txt");
+    createDummyFile("ext/script.sh");
+    createDummyFile("ext/noext");
+
+    QJsonObject root;
+    QJsonObject wallpaperObj;
+    QJsonArray dirsArray;
+    QJsonObject dirConfig;
+    dirConfig["path"]      = m_wallpaperRoot + "/ext";
+    dirConfig["recursive"] = false;
+    dirsArray.append(dirConfig);
+    wallpaperObj["dirs"] = dirsArray;
+    root["wallpaper"]    = wallpaperObj;
+
+    writeConfig(root);
+    Config config(m_tempDir.path(), {}, m_configPath);
+
+    QStringList wallpapers = config.getWallpapers();
+
+    int imageCount = 0;
+    for (const auto& w : wallpapers) {
+        if (w.endsWith(".txt") || w.endsWith(".sh") || w.endsWith("noext")) {
+            QFAIL(qPrintable("Found non-image file: " + w));
+        }
+        imageCount++;
+    }
+    QVERIFY(imageCount >= 3);
+}
+
+void TestConfigMgr::testSortTypes() {
+    // 1. None sort
+    {
+        QJsonObject root;
+        QJsonObject sortObj;
+        sortObj["type"]    = "none";
+        sortObj["reverse"] = false;
+        root["sort"]       = sortObj;
+
+        writeConfig(root);
+        Config config(m_tempDir.path(), {}, m_configPath);
+        QCOMPARE(config.getSortConfig().type, Config::SortType::None);
+        QCOMPARE(config.getSortConfig().reverse, false);
+    }
+    // 2. Name sort (default)
+    {
+        QJsonObject root;
+        QJsonObject sortObj;
+        sortObj["type"]    = "name";
+        sortObj["reverse"] = true;
+        root["sort"]       = sortObj;
+        writeConfig(root);
+        Config config(m_tempDir.path(), {}, m_configPath);
+        QCOMPARE(config.getSortConfig().type, Config::SortType::Name);
+        QCOMPARE(config.getSortConfig().reverse, true);
+    }
+    // 3. Size sort
+    {
+        QJsonObject root;
+        QJsonObject sortObj;
+        sortObj["type"] = "size";
+        root["sort"]    = sortObj;
+        writeConfig(root);
+        Config config(m_tempDir.path(), {}, m_configPath);
+        QCOMPARE(config.getSortConfig().type, Config::SortType::Size);
+    }
+    // 4. Date sort
+    {
+        QJsonObject root;
+        QJsonObject sortObj;
+        sortObj["type"] = "date";
+        root["sort"]    = sortObj;
+        writeConfig(root);
+        Config config(m_tempDir.path(), {}, m_configPath);
+        QCOMPARE(config.getSortConfig().type, Config::SortType::Date);
+    }
+    // 5. Invalid sort -> fallback to default (Name)
+    {
+        QJsonObject root;
+        QJsonObject sortObj;
+        sortObj["type"] = "invalid_blah";
+        root["sort"]    = sortObj;
+        writeConfig(root);
+        Config config(m_tempDir.path(), {}, m_configPath);
+        // Default initialized in Config constructor is Name
+        // But warning is logged
+        QCOMPARE(config.getSortConfig().type, Config::SortType::Name);
+    }
+    // 6. Case insensitivity for type string
+    {
+        QJsonObject root;
+        QJsonObject sortObj;
+        sortObj["type"] = "DaTe";
+        root["sort"]    = sortObj;
+        writeConfig(root);
+        Config config(m_tempDir.path(), {}, m_configPath);
+        QCOMPARE(config.getSortConfig().type, Config::SortType::Date);
+    }
+}
+
+QTEST_MAIN(TestConfigMgr)
+#include "tst_configmgr.moc"
diff --git a/Tests/tst_imagemodel.cpp b/Tests/tst_imagemodel.cpp
new file mode 100644
index 0000000..60b1077
--- /dev/null
+++ b/Tests/tst_imagemodel.cpp
@@ -0,0 +1,218 @@
+#include <QDate>
+#include <QSignalSpy>
+#include <QTemporaryDir>
+#include <QtTest>
+
+#include "configmgr.hpp"
+#include "imagemodel.hpp"
+#include "imageprovider.hpp"
+
+class TestImageModel : public QObject {
+    Q_OBJECT
+
+  private slots:
+    void initTestCase();
+    void testSortName();
+    void testSortDate();
+    void testSortSize();
+
+  private:
+    QTemporaryDir m_tempDir;
+    QString m_pathA;
+    QString m_pathB;
+    QString m_pathC;
+
+    void createTestFiles();
+    void waitForModel(ImageModel* model);
+};
+
+// clang-format off
+// xxd <file> -i
+static const unsigned char smallGIF[] = {
+    0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x01, 0x00, 0x01, 0x00, 0xf0, 0x00,
+    0x00, 0xcd, 0xcf, 0xd2, 0x00, 0x00, 0x00, 0x21, 0xf9, 0x04, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x2c, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00,
+    0x00, 0x02, 0x02, 0x44, 0x01, 0x00, 0x3b
+};
+static const unsigned char mediumGIF[] = {
+  0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x02, 0x00, 0x02, 0x00, 0xf1, 0x00,
+  0x00, 0xb0, 0xb8, 0xc0, 0xb7, 0xbc, 0xc2, 0xd8, 0xdb, 0xda, 0xe2, 0xdd,
+  0xdb, 0x21, 0xf9, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2c, 0x00, 0x00,
+  0x00, 0x00, 0x02, 0x00, 0x02, 0x00, 0x00, 0x02, 0x03, 0xd4, 0x10, 0x05,
+  0x00, 0x3b
+};
+static const unsigned char largeGIF[] = {
+  0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x03, 0x00, 0x03, 0x00, 0xf3, 0x00,
+  0x00, 0x80, 0x8b, 0x9c, 0xa9, 0xad, 0xac, 0xcf, 0xd5, 0xd6, 0xc9, 0xd2,
+  0xdc, 0xde, 0xd7, 0xd8, 0xdf, 0xdf, 0xdf, 0xd3, 0xda, 0xe0, 0xe9, 0xea,
+  0xeb, 0xf8, 0xf0, 0xee, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x21, 0xf9, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2c, 0x00, 0x00,
+  0x00, 0x00, 0x03, 0x00, 0x03, 0x00, 0x00, 0x04, 0x07, 0xf0, 0x14, 0x24,
+  0x02, 0x19, 0xc0, 0x44, 0x00, 0x3b
+};
+// clang-format on
+
+void TestImageModel::initTestCase() {
+    createTestFiles();
+}
+
+void TestImageModel::createTestFiles() {
+    QVERIFY(m_tempDir.isValid());
+
+    // Create files with specific names, sizes, dates
+    // a.gif: medium size, medium date
+    // c.gif: small size, old date
+    // b.gif: big size, new date
+    // Note: Names are a.gif, b.gif, c.gif for name sort.
+
+    m_pathA = m_tempDir.path() + "/a.gif";
+    m_pathB = m_tempDir.path() + "/b.gif";
+    m_pathC = m_tempDir.path() + "/c.gif";
+
+    {
+        QFile f(m_pathA);
+        QVERIFY(f.open(QIODevice::WriteOnly));
+        f.write(reinterpret_cast<const char*>(mediumGIF), sizeof(mediumGIF));
+        f.close();
+    }
+
+    {
+        QFile f(m_pathB);
+        QVERIFY(f.open(QIODevice::WriteOnly));
+        f.write(reinterpret_cast<const char*>(largeGIF), sizeof(largeGIF));
+        f.close();
+    }
+
+    {
+        QFile f(m_pathC);
+        QVERIFY(f.open(QIODevice::WriteOnly));
+        f.write(reinterpret_cast<const char*>(smallGIF), sizeof(smallGIF));
+        f.close();
+    }
+
+    // Set times
+
+    QDateTime now     = QDateTime::currentDateTime();
+    QDateTime timeOld = now.addDays(-10);
+    QDateTime timeMid = now.addDays(-5);
+    QDateTime timeNew = now;
+
+    {
+        QFile f(m_pathC);
+        QVERIFY(f.open(QIODevice::ReadWrite));
+        QVERIFY(f.setFileTime(timeOld, QFileDevice::FileModificationTime));
+    }
+    {
+        QFile f(m_pathA);
+        QVERIFY(f.open(QIODevice::ReadWrite));
+        QVERIFY(f.setFileTime(timeMid, QFileDevice::FileModificationTime));
+    }
+    {
+        QFile f(m_pathB);
+        QVERIFY(f.open(QIODevice::ReadWrite));
+        QVERIFY(f.setFileTime(timeNew, QFileDevice::FileModificationTime));
+    }
+}
+
+void TestImageModel::waitForModel(ImageModel* model) {
+    if (!model->isLoading()) {
+        return;
+    }
+    QSignalSpy spy(model, &ImageModel::isLoadingChanged);
+    while (model->isLoading()) {
+        if (!spy.wait(5000)) {
+            qWarning() << "Timeout waiting for model to load";
+            break;
+        }
+    }
+}
+
+void TestImageModel::testSortName() {
+    Config::SortConfigItems sortConfig;
+    sortConfig.type    = Config::SortType::Name;
+    sortConfig.reverse = false;
+
+    ImageProvider provider;
+    ImageModel model(provider, sortConfig, QSize(100, 100));
+
+    QStringList paths = {m_pathB, m_pathA, m_pathC};  // Unordered input
+    model.loadAndProcess(paths);
+    waitForModel(&model);
+
+    QCOMPARE(model.rowCount(), 3);
+
+    // Expected: a.gif, b.gif, c.gif
+    QCOMPARE(model.data(model.index(0), ImageModel::NameRole).toString(), "a.gif");
+    QCOMPARE(model.data(model.index(1), ImageModel::NameRole).toString(), "b.gif");
+    QCOMPARE(model.data(model.index(2), ImageModel::NameRole).toString(), "c.gif");
+
+    // Reverse
+    sortConfig.reverse = true;
+    model.sortUpdate();
+
+    QCOMPARE(model.rowCount(), 3);
+
+    // Expected: c.gif, b.gif, a.gif
+    QCOMPARE(model.data(model.index(0), ImageModel::NameRole).toString(), "c.gif");
+    QCOMPARE(model.data(model.index(1), ImageModel::NameRole).toString(), "b.gif");
+    QCOMPARE(model.data(model.index(2), ImageModel::NameRole).toString(), "a.gif");
+}
+
+void TestImageModel::testSortDate() {
+    Config::SortConfigItems sortConfig;
+    sortConfig.type    = Config::SortType::Date;
+    sortConfig.reverse = false;
+
+    ImageProvider provider;
+    ImageModel model(provider, sortConfig, QSize(100, 100));
+
+    QStringList paths = {m_pathA, m_pathC, m_pathB};
+    model.loadAndProcess(paths);
+    waitForModel(&model);
+
+    QCOMPARE(model.rowCount(), 3);
+
+    // Expected: c (old), a (mid), b (new)
+    QCOMPARE(model.data(model.index(0), ImageModel::NameRole).toString(), "c.gif");
+    QCOMPARE(model.data(model.index(1), ImageModel::NameRole).toString(), "a.gif");
+    QCOMPARE(model.data(model.index(2), ImageModel::NameRole).toString(), "b.gif");
+
+    // Reverse (Newest first)
+    sortConfig.reverse = true;
+    model.sortUpdate();
+
+    QCOMPARE(model.data(model.index(0), ImageModel::NameRole).toString(), "b.gif");
+    QCOMPARE(model.data(model.index(1), ImageModel::NameRole).toString(), "a.gif");
+    QCOMPARE(model.data(model.index(2), ImageModel::NameRole).toString(), "c.gif");
+}
+
+void TestImageModel::testSortSize() {
+    Config::SortConfigItems sortConfig;
+    sortConfig.type    = Config::SortType::Size;
+    sortConfig.reverse = false;
+
+    ImageProvider provider;
+    ImageModel model(provider, sortConfig, QSize(100, 100));
+
+    QStringList paths = {m_pathB, m_pathC, m_pathA};
+    model.loadAndProcess(paths);
+    waitForModel(&model);
+
+    QCOMPARE(model.rowCount(), 3);
+
+    QCOMPARE(model.data(model.index(0), ImageModel::NameRole).toString(), "c.gif");
+    QCOMPARE(model.data(model.index(1), ImageModel::NameRole).toString(), "a.gif");
+    QCOMPARE(model.data(model.index(2), ImageModel::NameRole).toString(), "b.gif");
+
+    // Reverse
+    sortConfig.reverse = true;
+    model.sortUpdate();
+
+    QCOMPARE(model.data(model.index(0), ImageModel::NameRole).toString(), "b.gif");
+    QCOMPARE(model.data(model.index(1), ImageModel::NameRole).toString(), "a.gif");
+    QCOMPARE(model.data(model.index(2), ImageModel::NameRole).toString(), "c.gif");
+}
+
+QTEST_MAIN(TestImageModel)
+#include "tst_imagemodel.moc"
diff --git a/WallReel/Core/CMakeLists.txt b/WallReel/Core/CMakeLists.txt
index f172e1c..64cb752 100644
--- a/WallReel/Core/CMakeLists.txt
+++ b/WallReel/Core/CMakeLists.txt
@@ -8,6 +8,9 @@ qt_add_qml_module(${CORELIB_NAME}
     configmgr.hpp configmgr.cpp
     imagemodel.hpp imagemodel.cpp
     imageprovider.hpp imageprovider.cpp
+    wallpaperservice.hpp wallpaperservice.cpp
+    palette/data.hpp
+    palette/manager.hpp palette/manager.cpp
 )
 
 target_link_libraries(${CORELIB_NAME} PRIVATE
diff --git a/WallReel/Core/configmgr.cpp b/WallReel/Core/configmgr.cpp
index 182d716..dca62dd 100644
--- a/WallReel/Core/configmgr.cpp
+++ b/WallReel/Core/configmgr.cpp
@@ -28,7 +28,9 @@ Config::Config(
     }
     if (!searchDirs.isEmpty()) {
         info(QString("Additional search directories: %1").arg(searchDirs.join(", ")));
-        m_wallpaperConfig.dirs.append(searchDirs);
+        for (const auto& dir : searchDirs) {
+            m_wallpaperConfig.dirs.append({dir, false});
+        }
     }
 
     debug("Loading wallpapers ...");
@@ -56,117 +58,227 @@ void Config::_loadConfig(const QString& configPath) {
 
     const auto jsonObj = jsonDoc.object();
 
-    struct ConfigMapping {
-        QString path;
-        QString key;
-        std::function<void(const QJsonValue&)> parser;
-    };
+    _loadWallpaperConfig(jsonObj);
+    _loadPaletteConfig(jsonObj);
+    _loadActionConfig(jsonObj);
+    _loadStyleConfig(jsonObj);
+    _loadSortConfig(jsonObj);
+}
 
-    static const auto parseJsonArray = [](const QJsonValue& val, QStringList& list) {
-        if (val.isArray()) {
-            for (const auto& item : val.toArray()) {
-                if (item.isString()) {
-                    list.append(::expandPath(item.toString()));
+void Config::_loadWallpaperConfig(const QJsonObject& root) {
+    if (!root.contains("wallpaper") || !root["wallpaper"].isObject()) {
+        return;
+    }
+    const QJsonObject& config = root["wallpaper"].toObject();
+
+    if (config.contains("paths") && config["paths"].isArray()) {
+        for (const auto& item : config["paths"].toArray()) {
+            if (item.isString()) {
+                m_wallpaperConfig.paths.append(::expandPath(item.toString()));
+            }
+        }
+    }
+
+    if (config.contains("dirs") && config["dirs"].isArray()) {
+        for (const auto& item : config["dirs"].toArray()) {
+            if (item.isObject()) {
+                QJsonObject obj = item.toObject();
+                if (obj.contains("path") && obj["path"].isString()) {
+                    WallpaperConfigItems::WallpaperDirConfigItem dirConfig;
+                    dirConfig.path = ::expandPath(obj["path"].toString());
+                    if (obj.contains("recursive") && obj["recursive"].isBool()) {
+                        dirConfig.recursive = obj["recursive"].toBool();
+                    } else {
+                        dirConfig.recursive = false;
+                    }
+                    m_wallpaperConfig.dirs.append(dirConfig);
                 }
             }
         }
-    };
+    }
 
-    std::vector<ConfigMapping>
-        mappings = {
-            {"wallpaper.paths", "paths", [this](const QJsonValue& val) {
-                 parseJsonArray(val, m_wallpaperConfig.paths);
-             }},
-            {"wallpaper.dirs", "dirs", [this](const QJsonValue& val) {
-                 parseJsonArray(val, m_wallpaperConfig.dirs);
-             }},
-            {"wallpaper.excludes", "excludes", [this](const QJsonValue& val) {
-                 parseJsonArray(val, m_wallpaperConfig.excludes);
-             }},
-            {"action.confirm", "confirm", [this](const QJsonValue& val) {
-                 if (val.isString()) {
-                     m_actionConfig.confirm = ::expandPath(val.toString());
-                     debug(QString("Action confirm: %1").arg(m_actionConfig.confirm));
-                 }
-             }},
-            {"style.aspect_ratio", "aspect_ratio", [this](const QJsonValue& val) {
-                 if (val.isDouble() && val.toDouble() > 0) {
-                     m_styleConfig.aspectRatio = val.toDouble();
-                     debug(QString("Aspect ratio: %1").arg(m_styleConfig.aspectRatio));
-                 }
-             }},
-            {"style.image_width", "image_width", [this](const QJsonValue& val) {
-                 if (val.isDouble() && val.toDouble() > 0) {
-                     m_styleConfig.imageWidth = val.toInt();
-                     debug(QString("Image width: %1").arg(m_styleConfig.imageWidth));
-                 }
-             }},
-            {"style.image_focus_width", "image_focus_width", [this](const QJsonValue& val) {
-                 if (val.isDouble() && val.toDouble() > 0) {
-                     m_styleConfig.imageFocusWidth = val.toInt();
-                     debug(QString("Image focus width: %1").arg(m_styleConfig.imageFocusWidth));
-                 }
-             }},
-            {"style.window_width", "window_width", [this](const QJsonValue& val) {
-                 if (val.isDouble() && val.toDouble() > 0) {
-                     m_styleConfig.windowWidth = val.toInt();
-                     debug(QString("Window width: %1").arg(m_styleConfig.windowWidth));
-                 }
-             }},
-            {"style.window_height", "window_height", [this](const QJsonValue& val) {
-                 if (val.isDouble() && val.toDouble() > 0) {
-                     m_styleConfig.windowHeight = val.toInt();
-                     debug(QString("Window height: %1").arg(m_styleConfig.windowHeight));
-                 }
-             }},
-            {"sort.type", "type", [this](const QJsonValue& val) {
-                 if (val.isString()) {
-                     QString type = val.toString().toLower();
-                     if (type == "none") {
-                         m_sortConfig.type = SortType::None;
-                     } else if (type == "name") {
-                         m_sortConfig.type = SortType::Name;
-                     } else if (type == "date") {
-                         m_sortConfig.type = SortType::Date;
-                     } else if (type == "size") {
-                         m_sortConfig.type = SortType::Size;
-                     } else {
-                         warn(QString("Unknown sort type: %1").arg(type));
-                     }
-                 }
-                 debug(QString("Sort type: %1").arg(static_cast<int>(m_sortConfig.type)));
-             }},
-            {"sort.reverse", "reverse", [this](const QJsonValue& val) {
-                 if (val.isBool()) {
-                     m_sortConfig.reverse = val.toBool();
-                     debug(QString("Sort reverse: %1").arg(m_sortConfig.reverse));
-                 }
-             }},
-        };
-
-    for (const auto& mapping : mappings) {
-        ([&mapping, &jsonObj]() {
-            auto pathParts = mapping.path.split('.');
-
-            QJsonObject currentObj = jsonObj;
-            QJsonValue targetValue;
-
-            for (int i = 0; i < pathParts.size() - 1; ++i) {
-                if (currentObj.contains(pathParts[i]) && currentObj[pathParts[i]].isObject()) {
-                    currentObj = currentObj[pathParts[i]].toObject();
+    if (config.contains("excludes") && config["excludes"].isArray()) {
+        for (const auto& item : config["excludes"].toArray()) {
+            if (item.isString()) {
+                auto regex = QRegularExpression(item.toString());
+                if (!regex.isValid()) {
+                    warn(QString("Invalid regular expression in config: %1").arg(item.toString()));
                 } else {
-                    debug(QString("Path '%1' not found").arg(pathParts.mid(0, i + 1).join('.')));
-                    return;
+                    m_wallpaperConfig.excludes.append(regex);
                 }
             }
+        }
+    }
+}
 
-            const QString& finalKey = pathParts.last();
-            if (currentObj.contains(finalKey)) {
-                mapping.parser(currentObj[finalKey]);
-            } else {
-                debug(QString("Key '%1' not found in '%2'").arg(finalKey).arg(mapping.path));
+void Config::_loadPaletteConfig(const QJsonObject& root) {
+    if (!root.contains("palettes") || !root["palettes"].isArray()) {
+        return;
+    }
+    const QJsonArray& palettes = root["palettes"].toArray();
+
+    for (const auto& palItem : palettes) {
+        if (palItem.isObject()) {
+            QJsonObject palObj = palItem.toObject();
+            PaletteConfigItems::PaletteConfigItem palette;
+            if (palObj.contains("name") && palObj["name"].isString()) {
+                palette.name = palObj["name"].toString();
             }
-        })();
+            if (palObj.contains("colors") && palObj["colors"].isArray()) {
+                for (const auto& colorItem : palObj["colors"].toArray()) {
+                    PaletteConfigItems::PaletteColorConfigItem colorConfig;
+                    if (colorItem.isObject()) {
+                        QJsonObject colorObj = colorItem.toObject();
+                        if (colorObj.contains("name") && colorObj["name"].isString()) {
+                            colorConfig.name = colorObj["name"].toString();
+                        }
+                        if (colorObj.contains("value") && colorObj["value"].isString()) {
+                            QColor color(colorObj["value"].toString());
+                            if (color.isValid()) {
+                                colorConfig.value = color;
+                            } else {
+                                warn(QString("Invalid color string in config: %1").arg(colorObj["value"].toString()));
+                            }
+                        }
+                    } else if (colorItem.isString()) {
+                        QColor color(colorItem.toString());
+                        if (color.isValid()) {
+                            colorConfig.value = color;
+                        } else {
+                            warn(QString("Invalid color string in config: %1").arg(colorItem.toString()));
+                        }
+                    }
+                    if (colorConfig.value.isValid()) {
+                        palette.colors.append(colorConfig);
+                    }
+                }
+            }
+            m_paletteConfig.palettes.append(palette);
+        }
+    }
+}
+
+void Config::_loadActionConfig(const QJsonObject& root) {
+    if (!root.contains("action") || !root["action"].isObject()) {
+        return;
+    }
+    const QJsonObject& config = root["action"].toObject();
+
+    if (config.contains("previewDebounceTime")) {
+        const auto& val = config["previewDebounceTime"];
+        if (val.isDouble() && val.toDouble() >= 0) {
+            m_actionConfig.previewDebounceTime = val.toInt();
+        }
+    }
+    if (config.contains("printSelected")) {
+        const auto& val = config["printSelected"];
+        if (val.isBool()) {
+            m_actionConfig.printSelected = val.toBool();
+        }
+    }
+    if (config.contains("printPreview")) {
+        const auto& val = config["printPreview"];
+        if (val.isBool()) {
+            m_actionConfig.printPreview = val.toBool();
+        }
+    }
+    if (config.contains("saveState")) {
+        const auto& val = config["saveState"];
+        if (val.isObject()) {
+            QJsonObject obj = val.toObject();
+            for (const auto& key : obj.keys()) {
+                if (obj[key].isString()) {
+                    m_actionConfig.saveState.insert(key, obj[key].toString());
+                }
+            }
+        }
+    }
+    if (config.contains("onRestore")) {
+        const auto& val = config["onRestore"];
+        if (val.isString()) {
+            m_actionConfig.onRestore = val.toString();
+        }
+    }
+    if (config.contains("onSelected")) {
+        const auto& val = config["onSelected"];
+        if (val.isString()) {
+            m_actionConfig.onSelected = val.toString();
+        }
+    }
+    if (config.contains("onPreview")) {
+        const auto& val = config["onPreview"];
+        if (val.isString()) {
+            m_actionConfig.onPreview = val.toString();
+        }
+    }
+}
+
+void Config::_loadStyleConfig(const QJsonObject& root) {
+    if (!root.contains("style") || !root["style"].isObject()) {
+        return;
+    }
+    const QJsonObject& config = root["style"].toObject();
+
+    if (config.contains("image_width")) {
+        const auto& val = config["image_width"];
+        if (val.isDouble() && val.toDouble() > 0) {
+            m_styleConfig.imageWidth = val.toInt();
+        }
+    }
+    if (config.contains("image_height")) {
+        const auto& val = config["image_height"];
+        if (val.isDouble() && val.toDouble() > 0) {
+            m_styleConfig.imageHeight = val.toInt();
+        }
+    }
+    if (config.contains("image_focus_scale")) {
+        const auto& val = config["image_focus_scale"];
+        if (val.isDouble() && val.toDouble() > 0) {
+            m_styleConfig.imageFocusScale = val.toDouble();
+        }
+    }
+    if (config.contains("window_width")) {
+        const auto& val = config["window_width"];
+        if (val.isDouble() && val.toDouble() > 0) {
+            m_styleConfig.windowWidth = val.toInt();
+        }
+    }
+    if (config.contains("window_height")) {
+        const auto& val = config["window_height"];
+        if (val.isDouble() && val.toDouble() > 0) {
+            m_styleConfig.windowHeight = val.toInt();
+        }
+    }
+}
+
+void Config::_loadSortConfig(const QJsonObject& root) {
+    if (!root.contains("sort") || !root["sort"].isObject()) {
+        return;
+    }
+    const QJsonObject& config = root["sort"].toObject();
+
+    if (config.contains("type")) {
+        const auto& val = config["type"];
+        if (val.isString()) {
+            QString type = val.toString().toLower();
+            if (type == "none") {
+                m_sortConfig.type = SortType::None;
+            } else if (type == "name") {
+                m_sortConfig.type = SortType::Name;
+            } else if (type == "date") {
+                m_sortConfig.type = SortType::Date;
+            } else if (type == "size") {
+                m_sortConfig.type = SortType::Size;
+            } else {
+                warn(QString("Unknown sort type: %1").arg(type));
+            }
+        }
+    }
+    if (config.contains("reverse")) {
+        const auto& val = config["reverse"];
+        if (val.isBool()) {
+            m_sortConfig.reverse = val.toBool();
+        }
     }
 }
 
@@ -181,22 +293,42 @@ void Config::_loadWallpapers() {
     }
 
     debug(QString("Loading wallpapers from %1 specified directories...").arg(m_wallpaperConfig.dirs.size()));
-    for (const QString& dirPath : std::as_const(m_wallpaperConfig.dirs)) {
-        QDir dir(dirPath);
-        if (checkDir(dirPath)) {
-            QStringList files = dir.entryList(QDir::Files | QDir::NoDotAndDotDot);
-            for (const QString& file : std::as_const(files)) {
-                QString filePath = dir.filePath(file);
-                paths.insert(expandPath(filePath));
-            }
+    for (const auto& dirConfig : std::as_const(m_wallpaperConfig.dirs)) {
+        if (checkDir(dirConfig.path)) {
+            std::function<void(const QDir&)> scanDir;
+            scanDir = [&](const QDir& d) {
+                QStringList files = d.entryList(QDir::Files | QDir::NoDotAndDotDot);
+                for (const QString& file : std::as_const(files)) {
+                    QString filePath = d.filePath(file);
+                    paths.insert(expandPath(filePath));
+                }
+
+                if (dirConfig.recursive) {
+                    QStringList subDirs = d.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
+                    debug(QString("Scanning directory '%1' for subdirectories... Found %2").arg(d.absolutePath()).arg(subDirs.size()));
+                    for (const QString& subDir : std::as_const(subDirs)) {
+                        scanDir(QDir(d.filePath(subDir)));
+                    }
+                }
+            };
+            scanDir(QDir(dirConfig.path));
         } else {
-            warn(QString("Directory '%1' does not exist").arg(dirPath));
+            warn(QString("Directory '%1' does not exist").arg(dirConfig.path));
         }
     }
 
     debug(QString("Excluding %1 specified paths...").arg(m_wallpaperConfig.excludes.size()));
-    for (const QString& exclude : std::as_const(m_wallpaperConfig.excludes)) {
-        paths.remove(exclude);
+    QStringList toRemove;
+    for (const auto& exclude : std::as_const(m_wallpaperConfig.excludes)) {
+        for (const QString& path : std::as_const(paths)) {
+            if (exclude.match(path).hasMatch()) {
+                toRemove.append(path);
+                debug(QString("Excluded path '%1' matched by regex '%2'").arg(path).arg(exclude.pattern()));
+            }
+        }
+    }
+    for (const auto& path : toRemove) {
+        paths.remove(path);
     }
 
     m_wallpapers.reserve(paths.size());
diff --git a/WallReel/Core/configmgr.hpp b/WallReel/Core/configmgr.hpp
index cc7fe35..ce5bc6d 100644
--- a/WallReel/Core/configmgr.hpp
+++ b/WallReel/Core/configmgr.hpp
@@ -1,37 +1,55 @@
 #ifndef WALLREEL_CONFIGMGR_HPP
 #define WALLREEL_CONFIGMGR_HPP
 
+#include <qregularexpression.h>
+
+#include <QColor>
 #include <QObject>
-#include <QQmlEngine>
+#include <QRegularExpression>
 #include <QSize>
 #include <QString>
 #include <QStringList>
 
 // Config entries:
 //
-// wallpaper.paths          array       image paths
-// wallpaper.dirs           array       directories to search for images.
-//                                      all images in these directories will be added.
-//                                      NOT recursive.
-// wallpaper.excludes       array       exclude patterns
+// wallpaper.paths              array   []      List of paths to images.
+// wallpaper.dirs               array   []      Directories to search for images.
+// wallpaper.dirs[].path        string  ""      Path to the directory.
+// wallpaper.dirs[].recursive   boolean false   Whether to search the directory recursively.
+// wallpaper.excludes           array   []      Exclude patterns (regex)
 //
-// action.confirm           string      command to execute on confirm
+// palettes                     array   []
+// palettes[].name              string  ""      Name of the palette
+// palettes[].colors            array   []      List of colors in the palette
+// palettes[].colors[].name     string  ""      Name of the color
+// palettes[].colors[].value    string  ""      Color value in hex format, e.g. "#ff0000" for red
 //
-// style.aspect_ratio       number      (width / height) of each image
-// style.image_width        number      width of each image
-// style.image_focus_width  number      width of focused image
-// style.window_width       number      fixed window width
-// style.window_height      number      fixed window height
+// action.previewDebounceTime   number  300     Minimum debounce time for preview action in milliseconds
+// action.printSelected         boolean false   Whether to print the selected wallpaper path to stdout on confirm
+// action.printPreview          boolean false   Whether to print the previewed wallpaper path to stdout on preview
+// action.saveState             object  {}      Key-value pairs to save the state, useful for restore command
+// action.onRestore             string  ""      Command to execute on restore ({{ key }} -> value in saveState)
+// action.onSelected            string  ""      Command to execute on confirmation ({{ path }} -> full path)
+// action.onPreview             string  ""      Command to execute on preview ({{ path }} -> full path)
 //
-// sort.type                string      sorting type: "none", "name", "date", "size"
-// sort.reverse             boolean     whether to reverse the sorting order
+// style.image_width            number  320     Width of each image
+// style.image_height           number  200     Height of each image
+// style.image_focus_scale      number  1.5     Scale of the focused image (relative to unfocused image)
+// style.window_width           number  750     Initial window width
+// style.window_height          number  500     Initial window height
+//
+// sort.type                    string  "name"  Sorting type: "none", "name", "date", "size"
+// sort.reverse                 boolean false   Whether to reverse the sorting order
+//                                              Normal order: name: lexicographical, e.g. "a.jpg" before "b.jpg"
+//                                                            date: older before newer
+//                                                            size: smaller before larger
 
 class Config : public QObject {
     Q_OBJECT
 
-    Q_PROPERTY(double aspectRatio READ getAspectRatio CONSTANT)
     Q_PROPERTY(int imageWidth READ getImageWidth CONSTANT)
-    Q_PROPERTY(int imageFocusWidth READ getImageFocusWidth CONSTANT)
+    Q_PROPERTY(int imageHeight READ getImageHeight CONSTANT)
+    Q_PROPERTY(double imageFocusScale READ getImageFocusScale CONSTANT)
     Q_PROPERTY(int windowWidth READ getWindowWidth CONSTANT)
     Q_PROPERTY(int windowHeight READ getWindowHeight CONSTANT)
 
@@ -44,30 +62,56 @@ class Config : public QObject {
     };
 
     struct WallpaperConfigItems {
-        QStringList paths;     // "wallpaper.paths"
-        QStringList dirs;      // "wallpaper.dirs"
-        QStringList excludes;  // "wallpaper.excludes"
+        struct WallpaperDirConfigItem {
+            QString path;
+            bool recursive;
+        };
+
+        QStringList paths;
+        QList<WallpaperDirConfigItem> dirs;
+        QList<QRegularExpression> excludes;
+    };
+
+    struct PaletteConfigItems {
+        struct PaletteColorConfigItem {
+            QString name;
+            QColor value;
+        };
+
+        struct PaletteConfigItem {
+            QString name;
+            QList<PaletteColorConfigItem> colors;
+        };
+
+        QList<PaletteConfigItem> palettes;
     };
 
     struct ActionConfigItems {
-        QString confirm;  // "action.confirm"
+
+        QHash<QString, QString> saveState;
+        QString onSelected;
+        QString onPreview;
+        QString onRestore;
+        int previewDebounceTime = 300;  // milliseconds
+        bool printSelected      = false;
+        bool printPreview       = false;
     };
 
     struct StyleConfigItems {
-        double aspectRatio  = 1.6;  // "style.aspect_ratio"
-        int imageWidth      = 320;  // "style.image_width"
-        int imageFocusWidth = 480;  // "style.image_focus_width"
-        int windowWidth     = 750;  // "style.window_width"
-        int windowHeight    = 500;  // "style.window_height"
+        double imageFocusScale = 1.5;
+        int imageWidth         = 320;
+        int imageHeight        = 200;
+        int windowWidth        = 750;
+        int windowHeight       = 500;
     };
 
     struct SortConfigItems {
-        SortType type = SortType::Name;  // "sort.type"
-        bool reverse  = false;           // "sort.reverse"
+        SortType type = SortType::Name;
+        bool reverse  = false;
     };
 
     Config(
-        const QString& configDir,  // Fixed, usually "~/.config/wallpaper-carousel"
+        const QString& configDir,
         const QStringList& searchDirs = {},
         const QString& configPath     = "",  // Override the default config path
         QObject* parent               = nullptr);
@@ -80,26 +124,26 @@ class Config : public QObject {
 
     const WallpaperConfigItems& getWallpaperConfig() const { return m_wallpaperConfig; }
 
+    const PaletteConfigItems& getPaletteConfig() const { return m_paletteConfig; }
+
     const ActionConfigItems& getActionConfig() const { return m_actionConfig; }
 
     const StyleConfigItems& getStyleConfig() const { return m_styleConfig; }
 
     const SortConfigItems& getSortConfig() const { return m_sortConfig; }
 
-    double getAspectRatio() const { return m_styleConfig.aspectRatio; }
-
     int getImageWidth() const { return m_styleConfig.imageWidth; }
 
-    int getImageFocusWidth() const { return m_styleConfig.imageFocusWidth; }
+    int getImageHeight() const { return m_styleConfig.imageHeight; }
+
+    double getImageFocusScale() const { return m_styleConfig.imageFocusScale; }
 
     int getWindowWidth() const { return m_styleConfig.windowWidth; }
 
     int getWindowHeight() const { return m_styleConfig.windowHeight; }
 
     QSize getFocusImageSize() const {
-        int width  = m_styleConfig.imageFocusWidth;
-        int height = static_cast<int>(width / m_styleConfig.aspectRatio);
-        return {width, height};
+        return QSize{m_styleConfig.imageWidth, m_styleConfig.imageHeight} * m_styleConfig.imageFocusScale;
     }
 
     static const QString s_DefaultConfigFileName;
@@ -108,9 +152,15 @@ class Config : public QObject {
   private:
     void _loadConfig(const QString& configPath);
     void _loadWallpapers();
+    void _loadWallpaperConfig(const QJsonObject& config);
+    void _loadPaletteConfig(const QJsonObject& config);
+    void _loadActionConfig(const QJsonObject& config);
+    void _loadStyleConfig(const QJsonObject& config);
+    void _loadSortConfig(const QJsonObject& config);
 
   private:
     WallpaperConfigItems m_wallpaperConfig;
+    PaletteConfigItems m_paletteConfig;
     ActionConfigItems m_actionConfig;
     StyleConfigItems m_styleConfig;
     SortConfigItems m_sortConfig;
diff --git a/WallReel/Core/imagedata.cpp b/WallReel/Core/imagedata.cpp
index e0712fa..9d1ded5 100644
--- a/WallReel/Core/imagedata.cpp
+++ b/WallReel/Core/imagedata.cpp
@@ -16,7 +16,7 @@ ImageData* ImageData::create(const QString& path, const QSize& size) {
 }
 
 ImageData::ImageData(const QString& path, const QSize& targetSize)
-    : file(path) {
+    : m_file(path) {
     QImageReader reader(path);
     if (!reader.canRead()) {
         warn(QString("Failed to load image from path: %1").arg(path));
@@ -38,27 +38,27 @@ ImageData::ImageData(const QString& path, const QSize& targetSize)
         }
     }
 
-    if (!reader.read(&image)) {
+    if (!reader.read(&m_image)) {
         warn(QString("Failed to load image from path: %1").arg(path));
         return;
     }
 
-    if (image.width() > processSize.width() || image.height() > processSize.height()) {
-        image = image.scaled(processSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+    if (m_image.width() > processSize.width() || m_image.height() > processSize.height()) {
+        m_image = m_image.scaled(processSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
     }
 
     // Crop to target size if necessary
-    if (image.size() != targetSize) {
-        int x = (image.width() - targetSize.width()) / 2;
-        int y = (image.height() - targetSize.height()) / 2;
-        image = image.copy(x, y, targetSize.width(), targetSize.height());
+    if (m_image.size() != targetSize) {
+        int x   = (m_image.width() - targetSize.width()) / 2;
+        int y   = (m_image.height() - targetSize.height()) / 2;
+        m_image = m_image.copy(x, y, targetSize.width(), targetSize.height());
     }
 
     // Convert to GPU-friendly format
-    if (image.format() != QImage::Format_ARGB32_Premultiplied) {
-        image = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
+    if (m_image.format() != QImage::Format_ARGB32_Premultiplied) {
+        m_image = m_image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
     }
 
     // Create ID
-    id = QString::number(qHash(file.absoluteFilePath()));
+    m_id = QString::number(qHash(m_file.absoluteFilePath()));
 }
diff --git a/WallReel/Core/imagedata.hpp b/WallReel/Core/imagedata.hpp
index 512a907..429a365 100644
--- a/WallReel/Core/imagedata.hpp
+++ b/WallReel/Core/imagedata.hpp
@@ -5,30 +5,30 @@
 #include <QImage>
 
 class ImageData {
-    QString id;
-    QFileInfo file;
-    QImage image;
+    QString m_id;
+    QFileInfo m_file;
+    QImage m_image;
 
     ImageData(const QString& path, const QSize& size);
 
   public:
     static ImageData* create(const QString& path, const QSize& size);
 
-    const QImage& getImage() const { return image; }
+    const QImage& getImage() const { return m_image; }
 
-    const QString& getId() const { return id; }
+    const QString& getId() const { return m_id; }
 
-    bool isValid() const { return !image.isNull(); }
+    bool isValid() const { return !m_image.isNull(); }
 
-    QString getFullPath() const { return file.absoluteFilePath(); }
+    QString getFullPath() const { return m_file.absoluteFilePath(); }
 
-    QString getFileName() const { return file.fileName(); }
+    QString getFileName() const { return m_file.fileName(); }
 
-    QDateTime getLastModified() const { return file.lastModified(); }
+    QDateTime getLastModified() const { return m_file.lastModified(); }
 
-    qint64 getSize() const { return file.size(); }
+    qint64 getSize() const { return m_file.size(); }
 
-    const QFileInfo& getFileInfo() const { return file; }
+    const QFileInfo& getFileInfo() const { return m_file; }
 
   private:
 };
diff --git a/WallReel/Core/imagemodel.cpp b/WallReel/Core/imagemodel.cpp
index c6af735..eaeb854 100644
--- a/WallReel/Core/imagemodel.cpp
+++ b/WallReel/Core/imagemodel.cpp
@@ -7,7 +7,7 @@
 #include "imagedata.hpp"
 
 ImageModel::ImageModel(
-    ImageProvider* provider,
+    ImageProvider& provider,
     const Config::SortConfigItems& sortConfig,
     QSize thumbnailSize,
     QObject* parent)
@@ -19,7 +19,7 @@ ImageModel::ImageModel(
         &m_watcher,
         &QFutureWatcher<ImageData*>::finished,
         this,
-        &ImageModel::onProcessingFinished);
+        &ImageModel::_onProcessingFinished);
     connect(
         &m_progressUpdateTimer,
         &QTimer::timeout,
@@ -33,6 +33,7 @@ ImageModel::~ImageModel() {
     m_watcher.cancel();
     m_watcher.waitForFinished();
     qDeleteAll(m_data);
+    m_data.clear();
 }
 
 int ImageModel::rowCount(const QModelIndex& parent) const {
@@ -67,16 +68,10 @@ void ImageModel::loadAndProcess(const QStringList& paths) {
     m_isLoading = true;
     emit isLoadingChanged();
 
-    beginResetModel();
-    if (!m_data.isEmpty()) {
-        qDeleteAll(m_data);
-    }
-    m_data.clear();
-    m_provider->clear();
-    endResetModel();
+    _clearData();
 
     m_processedCount = 0;
-    m_progressUpdateTimer.start(s_progressUpdateInterval);
+    m_progressUpdateTimer.start(s_ProgressUpdateIntervalMs);
     const auto thumbnailSize   = m_thumbnailSize;
     const auto counterPtr      = &m_processedCount;
     QFuture<ImageData*> future = QtConcurrent::mapped(paths, [thumbnailSize, counterPtr](const QString& path) {
@@ -94,12 +89,12 @@ void ImageModel::stop() {
     }
 }
 
-void ImageModel::onProgressValueChanged(int value) {
+void ImageModel::_onProgressValueChanged(int value) {
     Q_UNUSED(value);
     emit progressChanged();
 }
 
-void ImageModel::onProcessingFinished() {
+void ImageModel::_onProcessingFinished() {
     auto results = m_watcher.future().results();
     for (auto& data : results) {
         if (data && data->isValid()) {
@@ -116,7 +111,7 @@ void ImageModel::onProcessingFinished() {
     m_progressUpdateTimer.stop();
     emit progressChanged();
     // emit isLoadingChanged();
-    QTimer::singleShot(s_isLoadingUpdateInterval, this, [this]() {
+    QTimer::singleShot(s_IsLoadingUpdateIntervalMs, this, [this]() {
         emit isLoadingChanged();
     });
 }
@@ -128,27 +123,29 @@ void ImageModel::sortUpdate() {
         if (!a || !b) {
             return false;
         }
-        bool result = false;
+        if (a == b) {
+            return false;
+        }
+
+        ImageData* first  = reverse ? b : a;
+        ImageData* second = reverse ? a : b;
+
         switch (type) {
             case Config::SortType::Name:
-                result = QString::compare(a->getFileName(), b->getFileName(), Qt::CaseInsensitive) < 0;
-                break;
+                return QString::compare(first->getFileName(), second->getFileName(), Qt::CaseInsensitive) < 0;
             case Config::SortType::Date:
-                result = a->getLastModified() < b->getLastModified();
-                break;
+                return first->getLastModified() < second->getLastModified();
             case Config::SortType::Size:
-                result = a->getSize() < b->getSize();
-                break;
+                return first->getSize() < second->getSize();
             default:
-                break;
+                return false;
         }
-        return reverse ? !result : result;
     });
 
     beginResetModel();
-    m_provider->clear();
+    m_provider.clear();
     for (const auto& item : m_data) {
-        m_provider->insert(item);
+        m_provider.insert(item);
     }
     endResetModel();
 }
@@ -169,3 +166,31 @@ QVariant ImageModel::dataAt(int index, const QString& roleName) const {
         return QVariant();
     }
 }
+
+void ImageModel::_clearData() {
+    beginResetModel();
+    m_provider.clear();
+    qDeleteAll(m_data);
+    m_data.clear();
+    endResetModel();
+}
+
+void ImageModel::selectImage(int index) {
+    if (index < 0 || index >= m_data.count()) {
+        return;
+    }
+    const auto& item = m_data[index];
+    if (item) {
+        emit imageSelected(*item);
+    }
+}
+
+void ImageModel::previewImage(int index) {
+    if (index < 0 || index >= m_data.count()) {
+        return;
+    }
+    const auto& item = m_data[index];
+    if (item) {
+        emit imagePreviewed(*item);
+    }
+}
diff --git a/WallReel/Core/imagemodel.hpp b/WallReel/Core/imagemodel.hpp
index 2aa09f3..7987a2d 100644
--- a/WallReel/Core/imagemodel.hpp
+++ b/WallReel/Core/imagemodel.hpp
@@ -32,7 +32,7 @@ class ImageModel : public QAbstractListModel {
     }
 
     ImageModel(
-        ImageProvider* provider,
+        ImageProvider& provider,
         const Config::SortConfigItems& sortConfig,
         QSize thumbnailSize,
         QObject* parent = nullptr);
@@ -57,30 +57,38 @@ class ImageModel : public QAbstractListModel {
 
     Q_INVOKABLE QVariant dataAt(int index, const QString& roleName) const;
 
+    Q_INVOKABLE void selectImage(int index);
+
+    Q_INVOKABLE void previewImage(int index);
+
+  private:
+    void _clearData();
+
   signals:
     void isLoadingChanged();
     void progressChanged();
     void totalCountChanged();
-    void imageSelected(const QString& path);
+    void imageSelected(const ImageData& imageData);
+    void imagePreviewed(const ImageData& imageData);
 
   private slots:
-    void onProgressValueChanged(int value);
-    void onProcessingFinished();
+    void _onProgressValueChanged(int value);
+    void _onProcessingFinished();
 
   private:
-    ImageProvider* m_provider;
+    ImageProvider& m_provider;
     const Config::SortConfigItems& m_sortConfig;
     QSize m_thumbnailSize;
 
-    QList<ImageData*> m_data;
+    QVector<ImageData*> m_data;
 
     QFutureWatcher<ImageData*> m_watcher;
     bool m_isLoading = false;
 
     std::atomic<int> m_processedCount{0};
     QTimer m_progressUpdateTimer;
-    static constexpr int s_progressUpdateInterval  = 30;
-    static constexpr int s_isLoadingUpdateInterval = 50;
+    static constexpr int s_ProgressUpdateIntervalMs  = 30;
+    static constexpr int s_IsLoadingUpdateIntervalMs = 50;
 };
 
 #endif  // WALLREEL_IMAGEMODEL_HPP
diff --git a/WallReel/Core/palette/data.hpp b/WallReel/Core/palette/data.hpp
new file mode 100644
index 0000000..59e00e4
--- /dev/null
+++ b/WallReel/Core/palette/data.hpp
@@ -0,0 +1,43 @@
+#ifndef WALLREEL_PALETTE_DATA_HPP
+#define WALLREEL_PALETTE_DATA_HPP
+
+#include <QColor>
+#include <QList>
+#include <QObject>
+#include <QString>
+
+struct ColorItem {
+    Q_GADGET
+    Q_PROPERTY(QString name MEMBER name CONSTANT)
+    Q_PROPERTY(QColor color MEMBER color CONSTANT)
+
+  public:
+    QString name;
+    QColor color;
+
+    bool operator==(const ColorItem& other) const {
+        return name == other.name;
+    }
+};
+
+struct PaletteItem {
+    Q_GADGET
+    Q_PROPERTY(QString name MEMBER name CONSTANT)
+    Q_PROPERTY(QList<ColorItem> colors MEMBER colors CONSTANT)
+
+  public:
+    QString name;
+    QList<ColorItem> colors;
+
+    Q_INVOKABLE QColor getColor(const QString& colorName) const {
+        for (const auto& entry : colors) {
+            if (entry.name == colorName) return entry.color;
+        }
+        return QColor();
+    }
+};
+
+Q_DECLARE_METATYPE(ColorItem)
+Q_DECLARE_METATYPE(PaletteItem)
+
+#endif  // WALLREEL_PALETTE_DATA_HPP
diff --git a/WallReel/Core/palette/manager.cpp b/WallReel/Core/palette/manager.cpp
new file mode 100644
index 0000000..7c780cc
--- /dev/null
+++ b/WallReel/Core/palette/manager.cpp
@@ -0,0 +1,42 @@
+#include "manager.hpp"
+
+#include "predefined.hpp"
+
+PaletteManager::PaletteManager(
+    const Config::PaletteConfigItems& config,
+    QObject* parent) : QObject(parent) {
+    // The new ones overrides the old ones, use a hashtable to track
+    // the latest index of each palette name, then only insert the
+    // ones whose index matches the latest index in the hashtable
+    QHash<QString, int> lastSeen;
+    lastSeen.reserve(preDefinedPalettes.size() + config.palettes.size());
+
+    for (int i = 0; i < preDefinedPalettes.size(); i++) {
+        lastSeen[preDefinedPalettes[i].name] = i;
+    }
+    for (int i = 0; i < config.palettes.size(); i++) {
+        lastSeen[config.palettes[i].name] = preDefinedPalettes.size() + i;
+    }
+
+    m_palettes.reserve(lastSeen.size());
+    for (int i = 0; i < preDefinedPalettes.size(); i++) {
+        const auto& p = preDefinedPalettes[i];
+        if (lastSeen[p.name] == i) {
+            m_palettes.append({p.name, p.colors});
+        }
+    }
+    for (int i = 0; i < config.palettes.size(); i++) {
+        const auto& p = config.palettes[i];
+        if (lastSeen[p.name] == preDefinedPalettes.size() + i) {
+            auto newP = PaletteItem{p.name, {}};
+            newP.colors.reserve(p.colors.size());
+            for (const auto& c : p.colors) {
+                if (!c.value.isValid()) {
+                    continue;
+                }
+                newP.colors.append({c.name, c.value});
+            }
+            m_palettes.append(newP);
+        }
+    }
+}
diff --git a/WallReel/Core/palette/manager.hpp b/WallReel/Core/palette/manager.hpp
new file mode 100644
index 0000000..9c0fa11
--- /dev/null
+++ b/WallReel/Core/palette/manager.hpp
@@ -0,0 +1,30 @@
+#ifndef WALLREEL_PALETTE_MANAGER_HPP
+#define WALLREEL_PALETTE_MANAGER_HPP
+
+#include "../configmgr.hpp"
+#include "data.hpp"
+
+class PaletteManager : public QObject {
+    Q_OBJECT
+    Q_PROPERTY(QList<PaletteItem> availablePalettes READ availablePalettes CONSTANT)
+
+  public:
+    PaletteManager(const Config::PaletteConfigItems& config,
+                   QObject* parent = nullptr);
+
+    const QList<PaletteItem>& availablePalettes() const {
+        return m_palettes;
+    }
+
+    Q_INVOKABLE PaletteItem getPalette(const QString& name) const {
+        for (const auto& p : m_palettes) {
+            if (p.name == name) return p;
+        }
+        return PaletteItem();
+    }
+
+  private:
+    QList<PaletteItem> m_palettes;
+};
+
+#endif  // WALLREEL_PALETTE_MANAGER_HPP
diff --git a/WallReel/Core/palette/predefined.hpp b/WallReel/Core/palette/predefined.hpp
new file mode 100644
index 0000000..d7589f4
--- /dev/null
+++ b/WallReel/Core/palette/predefined.hpp
@@ -0,0 +1,88 @@
+#ifndef WALLREEL_PALETTES_PREDEFINED_HPP
+#define WALLREEL_PALETTES_PREDEFINED_HPP
+
+#include "data.hpp"
+
+inline const QList<PaletteItem> preDefinedPalettes = {
+
+    {
+        .name   = "Catppuccin Latte",
+        .colors = {
+
+            {"rosewater", "#dc8a78"},
+            {"flamingo", "#dd7878"},
+            {"pink", "#ea76cb"},
+            {"mauve", "#8839ef"},
+            {"red", "#d20f39"},
+            {"maroon", "#e64553"},
+            {"peach", "#fe640b"},
+            {"yellow", "#df8e1d"},
+            {"green", "#40a02b"},
+            {"teal", "#179299"},
+            {"sky", "#04a5e5"},
+            {"sapphire", "#209fb5"},
+            {"blue", "#1e66f5"},
+            {"lavender", "#7287fd"},
+        },
+    },
+    {
+        .name   = "Catppuccin Frappe",
+        .colors = {
+            {"rosewater", "#f2d5cf"},
+            {"flamingo", "#eebebe"},
+            {"pink", "#f4b8e4"},
+            {"mauve", "#ca9ee6"},
+            {"red", "#e78284"},
+            {"maroon", "#ea999c"},
+            {"peach", "#ef9f76"},
+            {"yellow", "#e5c890"},
+            {"green", "#a6d189"},
+            {"teal", "#81c8be"},
+            {"sky", "#99d1db"},
+            {"sapphire", "#85c1dc"},
+            {"blue", "#8caaee"},
+            {"lavender", "#babbf1"},
+        },
+    },
+    {
+        .name   = "Catppuccin Macchiato",
+        .colors = {
+            {"rosewater", "#f4dbd6"},
+            {"flamingo", "#f0c6c6"},
+            {"pink", "#f5bde6"},
+            {"mauve", "#c6a0f6"},
+            {"red", "#ed8796"},
+            {"maroon", "#ee99a0"},
+            {"peach", "#f5a97f"},
+            {"yellow", "#eed49f"},
+            {"green", "#a6da95"},
+            {"teal", "#8bd5ca"},
+            {"sky", "#91d7e3"},
+            {"sapphire", "#7dc4e4"},
+            {"blue", "#8aadf4"},
+            {"lavender", "#b7bdf8"},
+        },
+    },
+    {
+        .name   = "Catppuccin Mocha",
+        .colors = {
+
+            {"rosewater", "#f5e0dc"},
+            {"flamingo", "#f2cdcd"},
+            {"pink", "#f5c2e7"},
+            {"mauve", "#cba6f7"},
+            {"red", "#f38ba8"},
+            {"maroon", "#eba0ac"},
+            {"peach", "#fab387"},
+            {"yellow", "#f9e2af"},
+            {"green", "#a6e3a1"},
+            {"teal", "#94e2d5"},
+            {"sky", "#89dceb"},
+            {"sapphire", "#74c7ec"},
+            {"blue", "#89b4fa"},
+            {"lavender", "#b4befe"},
+        },
+    },
+};
+
+#endif  // WALLREEL_PALETTES_PREDEFINED_HPP
diff --git a/WallReel/Core/utils/colorextractor.hpp b/WallReel/Core/utils/colorextractor.hpp
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/WallReel/Core/utils/colorextractor.hpp
@@ -0,0 +1 @@
+
diff --git a/WallReel/Core/utils/texttemplate.hpp b/WallReel/Core/utils/texttemplate.hpp
new file mode 100644
index 0000000..d045516
--- /dev/null
+++ b/WallReel/Core/utils/texttemplate.hpp
@@ -0,0 +1,138 @@
+#ifndef TEXTTEMPLATE_HPP
+#define TEXTTEMPLATE_HPP
+
+#include <QMap>
+#include <QRegularExpression>
+#include <QString>
+
+/**
+ * @brief Replaces {{ key }} style placeholders in a template string with corresponding values from a map.
+ *
+ * Supports:
+ *   - Whitespace tolerance: {{ key }}, {{key}}, {{  key  }} are all valid.
+ *   - Missing keys are left as-is (no replacement).
+ *   - Nested braces or malformed placeholders are ignored.
+ *   - Empty keys are ignored.
+ *   - Keys are trimmed before lookup.
+ *
+ * @param templateStr The template string containing {{ key }} placeholders.
+ * @param variables   A map of key-value pairs for substitution.
+ * @return The rendered string with placeholders replaced.
+ */
+inline QString renderTemplate(const QString& templateStr, const QMap<QString, QString>& variables) {
+    if (templateStr.isEmpty() || variables.isEmpty()) {
+        return templateStr;
+    }
+
+    // Match {{ ... }} with possible whitespace around the key.
+    // Use a non-greedy match for the content inside braces to handle multiple placeholders correctly.
+    static const QRegularExpression regex(
+        QStringLiteral(R"(\{\{\s*([^{}]+?)\s*\}\})"),
+        QRegularExpression::DontCaptureOption);
+
+    // We need the capture group, so rebuild without DontCaptureOption
+    static const QRegularExpression placeholderRegex(
+        QStringLiteral(R"(\{\{\s*([^{}]+?)\s*\}\})"));
+
+    QString result;
+    result.reserve(templateStr.size());
+
+    qsizetype lastPos                  = 0;
+    QRegularExpressionMatchIterator it = placeholderRegex.globalMatch(templateStr);
+
+    while (it.hasNext()) {
+        const QRegularExpressionMatch match = it.next();
+        const qsizetype matchStart          = match.capturedStart(0);
+        const qsizetype matchLength         = match.capturedLength(0);
+        const QString key                   = match.captured(1).trimmed();
+
+        // Append everything before this match
+        result.append(templateStr.mid(lastPos, matchStart - lastPos));
+
+        if (!key.isEmpty() && variables.contains(key)) {
+            // Replace with the value from the map
+            result.append(variables.value(key));
+        } else {
+            // Key not found or empty — leave the placeholder as-is
+            result.append(match.captured(0));
+        }
+
+        lastPos = matchStart + matchLength;
+    }
+
+    // Append any remaining text after the last match
+    if (lastPos < templateStr.size()) {
+        result.append(templateStr.mid(lastPos));
+    }
+
+    return result;
+}
+
+/**
+ * @brief Overload accepting QHash for convenience.
+ */
+inline QString renderTemplate(const QString& templateStr, const QHash<QString, QString>& variables) {
+    if (templateStr.isEmpty() || variables.isEmpty()) {
+        return templateStr;
+    }
+
+    static const QRegularExpression placeholderRegex(
+        QStringLiteral(R"(\{\{\s*([^{}]+?)\s*\}\})"));
+
+    QString result;
+    result.reserve(templateStr.size());
+
+    qsizetype lastPos                  = 0;
+    QRegularExpressionMatchIterator it = placeholderRegex.globalMatch(templateStr);
+
+    while (it.hasNext()) {
+        const QRegularExpressionMatch match = it.next();
+        const qsizetype matchStart          = match.capturedStart(0);
+        const qsizetype matchLength         = match.capturedLength(0);
+        const QString key                   = match.captured(1).trimmed();
+
+        result.append(templateStr.mid(lastPos, matchStart - lastPos));
+
+        if (!key.isEmpty() && variables.contains(key)) {
+            result.append(variables.value(key));
+        } else {
+            result.append(match.captured(0));
+        }
+
+        lastPos = matchStart + matchLength;
+    }
+
+    if (lastPos < templateStr.size()) {
+        result.append(templateStr.mid(lastPos));
+    }
+
+    return result;
+}
+
+/**
+ * @brief Extracts all placeholder keys from a template string.
+ *
+ * @param templateStr The template string to scan.
+ * @return A list of unique keys found in the template (trimmed).
+ */
+inline QStringList extractTemplateKeys(const QString& templateStr) {
+    static const QRegularExpression placeholderRegex(
+        QStringLiteral(R"(\{\{\s*([^{}]+?)\s*\}\})"));
+
+    QSet<QString> seen;
+    QStringList keys;
+
+    QRegularExpressionMatchIterator it = placeholderRegex.globalMatch(templateStr);
+    while (it.hasNext()) {
+        const QRegularExpressionMatch match = it.next();
+        const QString key                   = match.captured(1).trimmed();
+        if (!key.isEmpty() && !seen.contains(key)) {
+            seen.insert(key);
+            keys.append(key);
+        }
+    }
+
+    return keys;
+}
+
+#endif  // TEXTTEMPLATE_HPP
diff --git a/WallReel/Core/wallpaperservice.cpp b/WallReel/Core/wallpaperservice.cpp
new file mode 100644
index 0000000..206e962
--- /dev/null
+++ b/WallReel/Core/wallpaperservice.cpp
@@ -0,0 +1,133 @@
+#include "wallpaperservice.hpp"
+
+#include <QColor>
+#include <iostream>
+
+#include "utils/logger.hpp"
+#include "utils/texttemplate.hpp"
+
+using namespace GeneralLogger;
+
+WallpaperService::WallpaperService(
+    const Config::ActionConfigItems& actionConfig,
+    QObject* parent)
+    : QObject(parent), m_actionConfig(actionConfig) {
+    m_previewDebounceTimer = new QTimer(this);
+    m_previewDebounceTimer->setSingleShot(true);
+    m_previewDebounceTimer->setInterval(m_actionConfig.previewDebounceTime);
+    connect(m_previewDebounceTimer, &QTimer::timeout, this, [this]() {
+        _doPreview(*m_pendingImageData);
+    });
+
+    m_previewProcess = new QProcess(this);
+    connect(m_previewProcess,
+            QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished),
+            this,
+            [this](int exitCode, QProcess::ExitStatus exitStatus) {
+                Q_UNUSED(exitCode);
+                Q_UNUSED(exitStatus);
+                emit previewCompleted();
+            });
+
+    m_selectProcess = new QProcess(this);
+    connect(m_selectProcess,
+            QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished),
+            this,
+            [this](int exitCode, QProcess::ExitStatus exitStatus) {
+                Q_UNUSED(exitCode);
+                Q_UNUSED(exitStatus);
+                emit selectCompleted();
+            });
+
+    m_restoreProcess = new QProcess(this);
+    connect(m_restoreProcess,
+            QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished),
+            this,
+            [this](int exitCode, QProcess::ExitStatus exitStatus) {
+                Q_UNUSED(exitCode);
+                Q_UNUSED(exitStatus);
+                emit restoreCompleted();
+            });
+}
+
+void WallpaperService::preview(const ImageData& imageData) {
+    m_pendingImageData = &imageData;
+    m_previewDebounceTimer->start();
+}
+
+void WallpaperService::select(const ImageData& imageData) {
+    if (m_selectProcess->state() != QProcess::NotRunning) {
+        warn("Previous select command is still running. Ignoring new command.");
+        return;
+    }
+    _doSelect(imageData);
+}
+
+void WallpaperService::restore() {
+    if (m_restoreProcess->state() != QProcess::NotRunning) {
+        warn("Previous restore command is still running. Ignoring new command.");
+        return;
+    }
+    _doRestore();
+}
+
+void WallpaperService::_doPreview(const ImageData& imageData) {
+    QString path = imageData.getFullPath();
+
+    if (path.isEmpty()) {
+        return;
+    }
+
+    if (m_actionConfig.printPreview) {
+        std::cout << path.toStdString() << std::endl;
+    }
+
+    const QHash<QString, QString> variables{
+        {"path", path},
+        {"name", imageData.getFileName()},
+    };
+    auto command = renderTemplate(m_actionConfig.onPreview, variables);
+    if (command.isEmpty()) {
+        return;
+    }
+
+    if (m_previewProcess->state() != QProcess::NotRunning) {
+        m_previewProcess->kill();
+        m_previewProcess->waitForFinished();
+    }
+    m_previewProcess->start("sh", QStringList() << "-c" << command);
+}
+
+void WallpaperService::_doSelect(const ImageData& imageData) {
+    QString path = imageData.getFullPath();
+
+    if (path.isEmpty()) {
+        return;
+    }
+
+    if (m_actionConfig.printSelected) {
+        std::cout << path.toStdString() << std::endl;
+    }
+
+    const QHash<QString, QString> variables{
+        {"path", path},
+        {"name", imageData.getFileName()},
+    };
+    auto command = renderTemplate(m_actionConfig.onSelected, variables);
+    if (command.isEmpty()) {
+        return;
+    }
+    m_selectProcess->start("sh", QStringList() << "-c" << command);
+}
+
+void WallpaperService::_doRestore() {
+    if (m_actionConfig.onRestore.isEmpty()) {
+        return;
+    }
+
+    const QString command = renderTemplate(m_actionConfig.onRestore, m_actionConfig.saveState);
+    if (command.isEmpty()) {
+        return;
+    }
+    m_restoreProcess->start("sh", QStringList() << "-c" << command);
+}
diff --git a/WallReel/Core/wallpaperservice.hpp b/WallReel/Core/wallpaperservice.hpp
new file mode 100644
index 0000000..ca641d2
--- /dev/null
+++ b/WallReel/Core/wallpaperservice.hpp
@@ -0,0 +1,41 @@
+#ifndef WALLREEL_WALLPAPERSERVICE_HPP
+#define WALLREEL_WALLPAPERSERVICE_HPP
+
+#include <QProcess>
+#include <QTimer>
+
+#include "configmgr.hpp"
+#include "imagedata.hpp"
+
+class WallpaperService : public QObject {
+    Q_OBJECT
+
+  public:
+    WallpaperService(
+        const Config::ActionConfigItems& actionConfig,
+        QObject* parent = nullptr);
+
+  public slots:
+    void preview(const ImageData& imageData);  // execute after 500ms of inactivity
+    void select(const ImageData& imageData);   // execute immediately, ignore if already running
+    void restore();                            // execute immediately, ignore if already running
+
+  signals:
+    void previewCompleted();
+    void selectCompleted();
+    void restoreCompleted();
+
+  private:
+    void _doPreview(const ImageData& imageData);
+    void _doSelect(const ImageData& imageData);
+    void _doRestore();
+
+    const Config::ActionConfigItems& m_actionConfig;
+    QTimer* m_previewDebounceTimer;
+    const ImageData* m_pendingImageData;
+    QProcess* m_previewProcess;
+    QProcess* m_selectProcess;
+    QProcess* m_restoreProcess;
+};
+
+#endif  // WALLREEL_WALLPAPERSERVICE_HPP
diff --git a/WallReel/UI/Pages/CarouselScreen.qml b/WallReel/UI/Pages/CarouselScreen.qml
index 5a21217..85bb6ac 100644
--- a/WallReel/UI/Pages/CarouselScreen.qml
+++ b/WallReel/UI/Pages/CarouselScreen.qml
@@ -19,10 +19,22 @@ Item {
         } else if (e.key === Qt.Key_Escape)
             Qt.quit();
         else if (e.key === Qt.Key_Return || e.key === Qt.Key_Enter)
-            ImageModel.confirm(carousel.currentIndex);
+            ImageModel.selectImage(carousel.currentIndex);
         else
             e.accepted = false;
     }
+    Component.onCompleted: {
+        ImageModel.previewImage(carousel.currentIndex);
+        root.forceActiveFocus();
+    }
+
+    Connections {
+        function onCurrentIndexChanged() {
+            ImageModel.previewImage(carousel.currentIndex);
+        }
+
+        target: carousel
+    }
 
     ColumnLayout {
         anchors.fill: parent
@@ -42,9 +54,9 @@ Item {
             Layout.fillHeight: true
             model: ImageModel
             itemWidth: Config.imageWidth
-            itemHeight: Config.imageWidth / Config.aspectRatio
-            focusedItemWidth: Config.imageFocusWidth
-            focusedItemHeight: Config.imageFocusWidth / Config.aspectRatio
+            itemHeight: Config.imageHeight
+            focusedItemWidth: Config.imageWidth * Config.imageFocusScale
+            focusedItemHeight: Config.imageHeight * Config.imageFocusScale
 
             MouseArea {
                 anchors.fill: parent
diff --git a/WallReel/main.cpp b/WallReel/main.cpp
index 331a804..e97209b 100644
--- a/WallReel/main.cpp
+++ b/WallReel/main.cpp
@@ -1,17 +1,21 @@
-#include <qtypes.h>
+#include <qobject.h>
 
 #include <QApplication>
 #include <QCommandLineParser>
 #include <QDir>
 #include <QQmlApplicationEngine>
+#include <QQmlContext>
 #include <QStandardPaths>
 #include <QTextStream>
 
 #include "Core/configmgr.hpp"
 #include "Core/imagemodel.hpp"
 #include "Core/imageprovider.hpp"
+#include "Core/palette/data.hpp"
+#include "Core/palette/manager.hpp"
 #include "Core/utils/logger.hpp"
 #include "Core/utils/misc.hpp"
+#include "Core/wallpaperservice.hpp"
 #include "version.h"
 
 /**
@@ -145,34 +149,58 @@ int main(int argc, char* argv[]) {
         return s_options.errorText.isEmpty() ? 0 : 1;
     }
 
-    Config config(
-        ::getConfigDir(),
-        s_options.appendDirs,
-        s_options.configPath,
-        &a);
     QQmlApplicationEngine engine;
 
     ImageProvider* imageProvider = new ImageProvider();
     engine.addImageProvider(QLatin1String("processed"), imageProvider);
 
-    ImageModel imageModel(
-        imageProvider,
-        config.getSortConfig(),
-        config.getFocusImageSize(),
+    auto config = new Config(
+        ::getConfigDir(),
+        s_options.appendDirs,
+        s_options.configPath,
+        imageProvider);
+
+    auto paletteMgr = new PaletteManager(
+        config->getPaletteConfig(),
         &a);
+    engine.rootContext()->setContextProperty("PaletteManager", paletteMgr);
+    qRegisterMetaType<PaletteItem>();
+    qRegisterMetaType<ColorItem>();
+
+    auto imageModel = new ImageModel(
+        *imageProvider,
+        config->getSortConfig(),
+        config->getFocusImageSize(),
+        config);
+
+    auto wallpaperService = new WallpaperService(
+        config->getActionConfig(),
+        config);
+
+    QObject::connect(
+        imageModel,
+        &ImageModel::imageSelected,
+        wallpaperService,
+        &WallpaperService::select);
+
+    QObject::connect(
+        imageModel,
+        &ImageModel::imagePreviewed,
+        wallpaperService,
+        &WallpaperService::preview);
 
     qmlRegisterSingletonInstance(
         COREMODULE_URI,
         MODULE_VERSION_MAJOR,
         MODULE_VERSION_MINOR,
         "Config",
-        &config);
+        config);
     qmlRegisterSingletonInstance(
         COREMODULE_URI,
         MODULE_VERSION_MAJOR,
         MODULE_VERSION_MINOR,
         "ImageModel",
-        &imageModel);
+        imageModel);
 
     QObject::connect(
         &engine,
@@ -182,7 +210,7 @@ int main(int argc, char* argv[]) {
         Qt::QueuedConnection);
     engine.loadFromModule(UIMODULE_URI, "Main");
 
-    imageModel.loadAndProcess(config.getWallpapers());
+    imageModel->loadAndProcess(config->getWallpapers());
 
     return a.exec();
 }