import QtQuick
import QtQuick.Controls

import clide.module 1.0

Rectangle {
    id: root
    signal fileClicked(string filePath)

    TreeView {
        id: fileSystemTreeView

        // rootIndex: FileSystem.rootIndex
        property int lastIndex: -1

        // model: FileSystem
        anchors.fill: parent
        boundsBehavior: Flickable.StopAtBounds
        boundsMovement: Flickable.StopAtBounds
        clip: true

        Component.onCompleted: fileSystemTreeView.toggleExpanded(0)

        // The delegate represents a single entry in the filesystem.
        delegate: TreeViewDelegate {
            id: treeDelegate
            indentation: 8
            implicitWidth: fileSystemTreeView.width > 0 ? fileSystemTreeView.width : 250
            implicitHeight: 25

            // Since we have the 'ComponentBehavior Bound' pragma, we need to
            // require these properties from our model. This is a convenient way
            // to bind the properties provided by the model's role names.
            required property int index
            required property url filePath
            required property string fileName

            indicator: Image {
                id: directoryIcon

                x: treeDelegate.leftMargin + (treeDelegate.depth * treeDelegate.indentation)
                anchors.verticalCenter: parent.verticalCenter
                source: treeDelegate.hasChildren ? (treeDelegate.expanded
                        ? "../icons/folder_open.svg" : "../icons/folder_closed.svg")
                    : "../icons/generic_file.svg"
                sourceSize.width: 20
                sourceSize.height: 20
                fillMode: Image.PreserveAspectFit

                smooth: true
                antialiasing: true
                asynchronous: true
            }

            contentItem: Text {
                text: treeDelegate.fileName
                color: RustColors.editor_text
            }

            background: Rectangle {
                color: (treeDelegate.index === fileSystemTreeView.lastIndex)
                    ? RustColors.editor_highlight
                    : (hoverHandler.hovered ? RustColors.active : "transparent")
            }

            // We color the directory icons with this MultiEffect, where we overlay
            // the colorization color ontop of the SVG icons.
            // MultiEffect {
            //     id: iconOverlay
            //
            //     anchors.fill: directoryIcon
            //     source: directoryIcon
            //     colorization: 1.0
            //     brightness: 1.0
            //     colorizationColor: {
            //         const isFile = treeDelegate.index === fileSystemTreeView.lastIndex
            //             && !treeDelegate.hasChildren;
            //         if (isFile)
            //             return Qt.lighter(RustColors.explorer_folder, 3)
            //
            //         const isExpandedFolder = treeDelegate.expanded && treeDelegate.hasChildren;
            //         if (isExpandedFolder)
            //             return RustColors.explorer_forder_open
            //         else
            //             return RustColors.explorer_folder
            //     }
            // }

            HoverHandler {
                id: hoverHandler
            }

            TapHandler {
                acceptedButtons: Qt.LeftButton | Qt.RightButton
                onSingleTapped: (eventPoint, button) => {
                    switch (button) {
                        case Qt.LeftButton:
                            fileSystemTreeView.toggleExpanded(treeDelegate.row)
                            fileSystemTreeView.lastIndex = treeDelegate.index
                            // If this model item doesn't have children, it means it's
                            // representing a file.
                            if (!treeDelegate.hasChildren)
                                root.fileClicked(treeDelegate.filePath)
                            break;
                        case Qt.RightButton:
                            if (treeDelegate.hasChildren)
                                contextMenu.popup();
                            break;
                    }
                }
            }

            Menu {
                id: contextMenu
                Action {
                    text: qsTr("Set as root index")
                    onTriggered: {
                        // fileSystemTreeView.rootIndex = fileSystemTreeView.index(treeDelegate.row, 0)
                    }
                }
                Action {
                    text: qsTr("Reset root index")
                    // onTriggered: fileSystemTreeView.rootIndex = undefined
                }
            }
        }

        // Provide our own custom ScrollIndicator for the TreeView.
        ScrollIndicator.vertical: ScrollIndicator {
            active: true
            implicitWidth: 15

            contentItem: Rectangle {
                implicitWidth: 6
                implicitHeight: 6

                color: RustColors.scrollbar
                opacity: fileSystemTreeView.movingVertically ? 0.5 : 0.0

                Behavior on opacity {
                    OpacityAnimator {
                        duration: 500
                    }
                }
            }
        }
    }
}