import QtQuick
import QtQuick.Controls
import QtQuick.Templates as T
import qs.Constants

T.ScrollView {
    id: root

    property color handleColor: Qt.alpha(Color.mTertiary, 0.8)
    property color handleHoverColor: handleColor
    property color handlePressedColor: handleColor
    property color trackColor: Color.transparent
    property real handleWidth: 6
    property real handleRadius: Style.radiusM
    property int verticalPolicy: ScrollBar.AsNeeded
    property int horizontalPolicy: ScrollBar.AsNeeded
    property bool preventHorizontalScroll: horizontalPolicy === ScrollBar.AlwaysOff
    property int boundsBehavior: Flickable.StopAtBounds
    property int flickableDirection: Flickable.VerticalFlick

    // Function to configure the underlying Flickable
    function configureFlickable() {
        // Find the internal Flickable (it's usually the first child)
        for (var i = 0; i < children.length; i++) {
            var child = children[i];
            if (child.toString().indexOf("Flickable") !== -1) {
                // Configure the flickable to prevent horizontal scrolling
                child.boundsBehavior = root.boundsBehavior;
                if (root.preventHorizontalScroll) {
                    child.flickableDirection = Flickable.VerticalFlick;
                    child.contentWidth = Qt.binding(() => {
                        return child.width;
                    });
                } else {
                    child.flickableDirection = root.flickableDirection;
                }
                break;
            }
        }
    }

    implicitWidth: Math.max(implicitBackgroundWidth + leftInset + rightInset, contentWidth + leftPadding + rightPadding)
    implicitHeight: Math.max(implicitBackgroundHeight + topInset + bottomInset, contentHeight + topPadding + bottomPadding)
    // Configure the internal flickable when it becomes available
    Component.onCompleted: {
        configureFlickable();
    }
    // Watch for changes in horizontalPolicy
    onHorizontalPolicyChanged: {
        preventHorizontalScroll = (horizontalPolicy === ScrollBar.AlwaysOff);
        configureFlickable();
    }

    ScrollBar.vertical: ScrollBar {
        parent: root
        x: root.mirrored ? 0 : root.width - width
        y: root.topPadding
        height: root.availableHeight
        active: root.ScrollBar.horizontal.active
        policy: root.verticalPolicy

        contentItem: Rectangle {
            implicitWidth: root.handleWidth
            implicitHeight: 100
            radius: root.handleRadius
            color: parent.pressed ? root.handlePressedColor : parent.hovered ? root.handleHoverColor : root.handleColor
            opacity: parent.policy === ScrollBar.AlwaysOn || parent.active ? 1 : 0

            Behavior on opacity {
                NumberAnimation {
                    duration: Style.animationFast
                }

            }

            Behavior on color {
                ColorAnimation {
                    duration: Style.animationFast
                }

            }

        }

        background: Rectangle {
            implicitWidth: root.handleWidth
            implicitHeight: 100
            color: root.trackColor
            opacity: parent.policy === ScrollBar.AlwaysOn || parent.active ? 0.3 : 0
            radius: root.handleRadius / 2

            Behavior on opacity {
                NumberAnimation {
                    duration: Style.animationFast
                }

            }

        }

    }

    ScrollBar.horizontal: ScrollBar {
        parent: root
        x: root.leftPadding
        y: root.height - height
        width: root.availableWidth
        active: root.ScrollBar.vertical.active
        policy: root.horizontalPolicy

        contentItem: Rectangle {
            implicitWidth: 100
            implicitHeight: root.handleWidth
            radius: root.handleRadius
            color: parent.pressed ? root.handlePressedColor : parent.hovered ? root.handleHoverColor : root.handleColor
            opacity: parent.policy === ScrollBar.AlwaysOn || parent.active ? 1 : 0

            Behavior on opacity {
                NumberAnimation {
                    duration: Style.animationFast
                }

            }

            Behavior on color {
                ColorAnimation {
                    duration: Style.animationFast
                }

            }

        }

        background: Rectangle {
            implicitWidth: 100
            implicitHeight: root.handleWidth
            color: root.trackColor
            opacity: parent.policy === ScrollBar.AlwaysOn || parent.active ? 0.3 : 0
            radius: root.handleRadius / 2

            Behavior on opacity {
                NumberAnimation {
                    duration: Style.animationFast
                }

            }

        }

    }

}