import QtQuick
import QtQuick.Controls
import QtQuick.Layouts
import Quickshell
import Quickshell.Io
import qs.modules.common
import qs.modules.common.widgets

Rectangle {
    id: root
    
    readonly property real panelPadding: 20
    property string stickypadContents: ""
    property bool pendingReload: false
    property var copylistEntries: []
    property string lastParsedCopylistText: ""
    property var parsedCopylistLines: []
    // CUSTOM: Track clickthrough state to disable text editing - START
    property bool isClickthrough: false
    // CUSTOM: Track clickthrough state to disable text editing - END
    
    color: Appearance.colors.colLayer0
    radius: Appearance.rounding.windowRounding - 6
    
    Component.onCompleted: {
        stickypadFile.reload()
        updateCopylistEntries()
    }
    
    function saveStickypad() {
        if (!stickypadInput)
            return
        stickypadContents = stickypadInput.text
        stickypadFile.setText(stickypadContents)
    }
    
    function focusStickypadAtEnd() {
        if (!stickypadInput)
            return
        stickypadInput.forceActiveFocus()
        const endPos = stickypadInput.text.length
        applySelection(endPos, endPos)
    }
    
    function applySelection(cursorPos, anchorPos) {
        if (!stickypadInput)
            return
        const textLength = stickypadInput.text.length
        const cursor = Math.max(0, Math.min(cursorPos, textLength))
        const anchor = Math.max(0, Math.min(anchorPos, textLength))
        stickypadInput.select(anchor, cursor)
        if (cursor === anchor)
            stickypadInput.deselect()
    }
    
    function scheduleCopylistUpdate(immediate = false) {
        if (!stickypadInput)
            return
        if (immediate) {
            copylistDebounce.stop()
            updateCopylistEntries()
        } else {
            copylistDebounce.restart()
        }
    }
    
    function updateCopylistEntries() {
        if (!stickypadInput)
            return
        const textValue = stickypadInput.text
        if (!textValue || textValue.length === 0) {
            lastParsedCopylistText = ""
            parsedCopylistLines = []
            copylistEntries = []
            return
        }
        
        if (textValue !== lastParsedCopylistText) {
            const lineRegex = /(.*?)(\r?\n|$)/g
            let match = null
            const parsed = []
            while ((match = lineRegex.exec(textValue)) !== null) {
                const lineText = match[1]
                const newlineText = match[2]
                const lineStart = match.index
                const lineEnd = lineStart + lineText.length
                const bulletMatch = lineText.match(/^\s*-\s+(.*\S)\s*$/)
                if (bulletMatch) {
                    parsed.push({
                        content: bulletMatch[1].trim(),
                        start: lineStart,
                        end: lineEnd
                    })
                }
                if (newlineText === "")
                    break
            }
            lastParsedCopylistText = textValue
            parsedCopylistLines = parsed
            if (parsed.length === 0) {
                copylistEntries = []
                return
            }
        }
        
        updateCopylistPositions()
    }
    
    function updateCopylistPositions() {
        if (!stickypadInput || parsedCopylistLines.length === 0)
            return
        
        const rawSelectionStart = stickypadInput.selectionStart
        const rawSelectionEnd = stickypadInput.selectionEnd
        const selectionStart = rawSelectionStart === -1 ? stickypadInput.cursorPosition : rawSelectionStart
        const selectionEnd = rawSelectionEnd === -1 ? stickypadInput.cursorPosition : rawSelectionEnd
        const rangeStart = Math.min(selectionStart, selectionEnd)
        const rangeEnd = Math.max(selectionStart, selectionEnd)
        
        const entries = parsedCopylistLines.map(line => {
            const caretIntersects = rangeEnd > line.start && rangeStart <= line.end
            if (caretIntersects)
                return null
            const startRect = stickypadInput.positionToRectangle(line.start)
            let endRect = stickypadInput.positionToRectangle(line.end)
            if (!isFinite(startRect.y))
                return null
            if (!isFinite(endRect.y))
                endRect = startRect
            const lineBottom = endRect.y + endRect.height
            const rectHeight = Math.max(lineBottom - startRect.y, stickypadInput.font.pixelSize + 8)
            return {
                content: line.content,
                y: startRect.y,
                height: rectHeight
            }
        }).filter(entry => entry !== null)
        
        copylistEntries = entries
    }
    
    ColumnLayout {
        id: stickypadLayout
        anchors {
            fill: parent
            margins: panelPadding
        }
        spacing: 14
        
        ScrollView {
            id: editorScrollView
            Layout.fillWidth: true
            Layout.fillHeight: true
            Layout.minimumHeight: 200
            clip: true
            ScrollBar.vertical.policy: ScrollBar.AsNeeded
            onWidthChanged: root.scheduleCopylistUpdate(true)
            
            StyledTextArea {
                id: stickypadInput
                wrapMode: TextEdit.Wrap
                placeholderText: Translation.tr("Write...")
                selectByMouse: true
                persistentSelection: true
                textFormat: TextEdit.PlainText
                background: null
                rightPadding: 44
                // Adapt text color to theme (light/dark mode) - START
                color: Appearance.colors.colOnLayer0
                // Adapt text color to theme (light/dark mode) - END
                // Disable text area when clickthrough enabled - START
                enabled: GlobalStates.overlayOpen || !root.isClickthrough
                activeFocusOnTab: GlobalStates.overlayOpen || !root.isClickthrough
                // Disable text area when clickthrough enabled - END
                
                onTextChanged: {
                    if (stickypadInput.activeFocus) {
                        saveDebounce.restart()
                    }
                    root.scheduleCopylistUpdate(true)
                }
                onCursorPositionChanged: root.scheduleCopylistUpdate()
                onSelectionStartChanged: root.scheduleCopylistUpdate()
                onSelectionEndChanged: root.scheduleCopylistUpdate()
                onHeightChanged: root.scheduleCopylistUpdate(true)
                onContentHeightChanged: root.scheduleCopylistUpdate(true)
            }
            
            Item {
                anchors.fill: stickypadInput
                visible: copylistEntries.length > 0
                clip: true
                
                Repeater {
                    model: copylistEntries
                    delegate: Item {
                        readonly property real lineHeight: Math.max(modelData.height, Appearance.font.pixelSize.normal + 6)
                        readonly property real iconSizeLocal: Appearance.font.pixelSize.normal
                        readonly property real hitPadding: 6
                        
                        width: iconSizeLocal + hitPadding * 2
                        height: lineHeight
                        y: modelData.y
                        x: Math.max(stickypadInput.width - width - 8, 0)
                        z: 5
                        
                        Rectangle {
                            id: feedbackFlash
                            anchors.centerIn: iconItem
                            width: iconSizeLocal + hitPadding
                            height: width
                            radius: width / 2
                            color: Appearance.colors.colLayer2
                            opacity: 0
                            z: -1
                        }
                        
                        MaterialSymbol {
                            id: iconItem
                            anchors.centerIn: parent
                            text: "content_copy"
                            iconSize: iconSizeLocal
                            color: Appearance.colors.colOnLayer1
                            opacity: mouseArea.containsMouse ? 1 : 0.85
                            scale: 1
                            Behavior on scale {
                                NumberAnimation {
                                    duration: 120
                                    easing.type: Easing.OutQuad
                                }
                            }
                            Behavior on opacity {
                                NumberAnimation {
                                    duration: 120
                                }
                            }
                        }
                        
                        MouseArea {
                            id: mouseArea
                            anchors.fill: parent
                            anchors.margins: hitPadding
                            hoverEnabled: true
                            cursorShape: Qt.PointingHandCursor
                            onPressed: iconItem.scale = 0.85
                            onReleased: iconItem.scale = 1
                            onCanceled: iconItem.scale = 1
                            onClicked: {
                                feedbackFlash.opacity = 0.6
                                feedbackFade.restart()
                                Quickshell.clipboardText = modelData.content
                            }
                        }
                        
                        NumberAnimation {
                            id: feedbackFade
                            target: feedbackFlash
                            property: "opacity"
                            to: 0
                            duration: 200
                            easing.type: Easing.OutQuad
                        }
                    }
                }
            }
        }
        
        Rectangle {
            Layout.fillWidth: true
            Layout.preferredHeight: 28
            Layout.minimumHeight: 28
            color: "transparent"
            
            StyledText {
                id: statusLabel
                anchors {
                    right: parent.right
                    verticalCenter: parent.verticalCenter
                    rightMargin: 8
                }
                text: saveDebounce.running ? "Saving..." : "Saved"
                color: saveDebounce.running ? Appearance.colors.colAccent : Appearance.colors.colSubtext
                font.pixelSize: Appearance.font.pixelSize.small
                font.weight: Font.Medium
            }
        }
    }
    
    Timer {
        id: saveDebounce
        interval: 500
        repeat: false
        onTriggered: saveStickypad()
    }
    
    Timer {
        id: copylistDebounce
        interval: 100
        repeat: false
        onTriggered: updateCopylistPositions()
    }
    
    FileView {
        id: stickypadFile
        path: Qt.resolvedUrl(Directories.stickypadPath)
        onLoaded: {
            stickypadContents = stickypadFile.text()
            if (stickypadInput && stickypadInput.text !== stickypadContents) {
                const previousCursor = stickypadInput.cursorPosition
                const previousAnchor = stickypadInput.selectionStart
                stickypadInput.text = stickypadContents
                applySelection(previousCursor, previousAnchor)
            }
            if (pendingReload) {
                pendingReload = false
                Qt.callLater(focusStickypadAtEnd)
            }
            Qt.callLater(root.updateCopylistEntries)
        }
        onLoadFailed: (error) => {
            if (error === FileViewError.FileNotFound) {
                stickypadContents = ""
                stickypadFile.setText(stickypadContents)
                if (stickypadInput)
                    stickypadInput.text = stickypadContents
                if (pendingReload) {
                    pendingReload = false
                    Qt.callLater(focusStickypadAtEnd)
                }
                Qt.callLater(root.updateCopylistEntries)
            } else {
                console.log("[Stickypad] Error loading file: " + error)
            }
        }
    }
}