// SPDX-License-Identifier: Unlicense

import QtQuick 2.12
import QtQuick.Controls 2.13
import QtQuick.Layouts 1.6
import Qt.labs.platform 1.1

import fuzbal 1
import 'util.js' as Util

Page {
    id: control

    required property Video video
    property bool modified: false

    EventList {
        id: eventList
        onDataChanged: modified = true
        onRowsInserted: modified = true
        onRowsRemoved: modified = true
    }

    EventFilter {
        id: eventFilter
        sourceModel: eventList
    }

    FileDialog {
        id: dialog

        title: qsTr('Load video or tags')
        nameFilters: [qsTr('all files (*)'), qsTr('events and tags (*.events *.json)')]

        onAccepted: {
            const path = file.toString()
            if (path.endsWith('.json')) {
                eventList.load({ 'tags': JSON.parse(io.read(file)) })
                modified = true
            } else {
                video.source = path.endsWith('.events') ? path.substr(0, path.length-7) : path
                const json = JSON.parse(io.read(video.source+'.events') || '{}')
                eventList.load(json)
                description.text = json['description'] || ''
                modified = false
            }
        }
    }

    Keys.forwardTo: [video, tags]

    // Save / load buttons.
    header: ToolBar {
        horizontalPadding: 0
        RowLayout {
            anchors.fill: parent
            spacing: 0

            Label {
                text: video.loaded ? video.source : qsTr('(no video)')
                elide: Text.ElideLeft
                leftPadding: 5
                Layout.fillWidth: true
            }

            ToolButton {
                action: Action {
                    icon.name: 'document-save'
                    shortcut: StandardKey.Save
                    enabled: video.loaded && control.modified
                    onTriggered: {
                        var json = eventList.save()
                        json['description'] = description.text
                        json['video'] = video.source
                        json['version'] = Qt.application.version
                        io.write(video.source+'.events', JSON.stringify(json))
                        modified = false
                    }
                }
                visible: video.loaded
                opacity: enabled ? 1 : 0.25
                focusPolicy: Qt.NoFocus
            }

            ToolButton {
                action: Action {
                    icon.name: 'document-open'
                    shortcut: StandardKey.Open
                    onTriggered: dialog.open()
                }
                focusPolicy: Qt.NoFocus
            }
        }
    }

    ColumnLayout {
        anchors.fill: parent

        // Description box.
        Rectangle {
            Layout.fillWidth: true
            Layout.maximumHeight: 100
            Layout.preferredHeight: description.implicitHeight

            border.color: description.activeFocus ? palette.highlight : palette.dark
            color: palette.base
            radius: 2

            ScrollView {
                anchors.fill: parent
                ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
                padding: 0

                TextArea {
                    id: description

                    placeholderText: qsTr('Description')
                    padding: filter.padding
                    leftPadding: filter.leftPadding
                    selectByMouse: true
                    wrapMode: Text.Wrap

                    onTextChanged: modified = true
                    KeyNavigation.priority: KeyNavigation.BeforeItem
                    KeyNavigation.tab: nextItemInFocusChain()
                }
            }

            Hotkey {
                control: description
                sequence: qsTr('Ctrl+D')
                anchors { right: parent.right; bottom: parent.bottom; margins: 4 }
                font.pixelSize: description.font.pixelSize * 0.75
            }
        }

        // Filter box.
        TextField {
            id: filter

            Layout.fillWidth: true
            placeholderText: qsTr('Filter')
            background: Rectangle {
                border.color: parent.activeFocus ? palette.highlight : palette.dark
                color: palette.base
                radius: 2
            }

            onTextChanged: eventFilter.setFilter(text)
            Keys.onEscapePressed: text = ''

            Hotkey {
                control: filter
                sequence: StandardKey.Find
                anchors { right: parent.right; bottom: parent.bottom; margins: 4 }
                font.pixelSize: filter.font.pixelSize * 0.75
            }
        }

        // Event list.
        Frame {
            Layout.fillWidth: true
            Layout.fillHeight: true
            Layout.rightMargin: -control.padding // fill to window edge for easier scrolling

            focusPolicy: Qt.StrongFocus

            padding: 1
            rightPadding: 0
            background: Rectangle {
                border.color: parent.activeFocus ? palette.highlight : palette.dark
                color: 'transparent'
                radius: 2
            }

            Events {
                id: events

                model: eventFilter
                tags: eventList.tags

                anchors.fill: parent
                focus: true

                onEditingChanged: video.pause(editing)
                onSelected: {
                    video.pause(true)
                    video.seek(event.time)
                }
                Keys.forwardTo: control
            }

            Hotkey {
                control: events
                sequence: qsTr('Ctrl+E')
                anchors {
                    right: parent.right
                    top: parent.top
                    margins: 4
                    rightMargin: control.padding + anchors.margins
                }
                font.pixelSize: filter.font.pixelSize * 0.75
            }
        }

        // Tags box.
        Flow {
            id: tags

            Layout.fillWidth: true
            enabled: video.loaded && !events.editing

            // Try passing key to each tag button in order.
            Keys.forwardTo: Array.from({ length: buttons.count }, (_, i) => buttons.itemAt(i))
            Keys.enabled: enabled

            spacing: 5

            Label {
                text: qsTr('(no tags)')
                visible: buttons.count === 0
            }

            Repeater {
                id: buttons
                model: eventList.tagsOrder.map(name => eventList.tags[name])
                delegate: Button {
                    readonly property string name: modelData.name || modelData.tag

                    text: Util.addShortcut(name, modelData.key)
                    focusPolicy: Qt.NoFocus
                    implicitWidth: implicitContentWidth + 2*padding

                    onClicked: {
                        // Create a new event with this tag and current time.
                        const index = eventList.insert(name, video.time)
                        // Reset filter if new event doesn’t match.
                        var row = eventFilter.mapFromSource(eventList.index(index, 0)).row
                        if (row === -1) {
                            filter.text = ''
                            row = index
                        }
                        events.currentIndex = row
                        events.forceActiveFocus()
                        const event = events.currentItem
                        if (event.fields.length > 0)
                            events.editing = true
                    }

                    Keys.onPressed: {
                        if (event.text === modelData.key) {
                            clicked()
                            event.accepted = true
                        }
                    }
                }
            }
        }
    }
}