// 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('Open video or tags')
        nameFilters: [qsTr('all files (*)'), qsTr('fuzbal files (*.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: [tags, video]

    // 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.
        Frame {
            Layout.fillWidth: true
            Layout.maximumHeight: 100
            padding: 1

            ScrollView {
                anchors.fill: parent
                contentWidth: parent.availableWidth
                padding: 0

                visible: description.enabled
                background: Frame { }
                ScrollBar.horizontal.policy: ScrollBar.AlwaysOff

                TextArea {
                    id: description

                    placeholderText: qsTr('Description')
                    background: Rectangle { color: palette.base }
                    leftPadding: padding
                    selectByMouse: true
                    wrapMode: Text.Wrap

                    onTextChanged: modified = true
                    KeyNavigation.priority: KeyNavigation.BeforeItem
                    KeyNavigation.tab: events
                }
            }
        }

        TextField {
            id: filter
            Layout.fillWidth: true
            placeholderText: qsTr('Filter')
            onTextChanged: eventFilter.setFilter(text)
            Keys.onEscapePressed: text = ''
        }

        Events {
            id: events

            Layout.fillWidth: true
            Layout.fillHeight: true
            Layout.rightMargin: -control.padding

            focus: true
            model: eventFilter
            tags: eventList.tags

            onEditingChanged: video.pause(editing)
            onCurrentItemChanged: {
                if (currentItem)
                    video.seek(currentItem.time)
            }

            Rectangle {
                anchors { left: parent.left; right: parent.right; top: parent.top }
                implicitHeight: 1
                color: palette.mid
            }

            Rectangle {
                anchors { left: parent.left; right: parent.right; bottom: parent.bottom }
                implicitHeight: 1
                color: palette.mid
            }

            Keys.onPressed: {
                switch (event.key) {
                case Qt.Key_Home:
                    currentIndex = 0
                    break
                case Qt.Key_End:
                    currentIndex = count-1
                    break
                case Qt.Key_Enter:
                case Qt.Key_Return:
                    if (editing) {
                        currentItem.store()
                        editing = false
                    } else {
                        if (currentItem.fields.length > 0)
                            editing = true
                    }
                    break
                case Qt.Key_Escape:
                    if (editing) {
                        currentItem.reset()
                        editing = false
                    }
                    break
                case Qt.Key_Delete:
                    editing = false
                    eventFilter.remove(currentIndex)
                    break
                case Qt.Key_Tab:
                case Qt.Key_Backtab:
                    // swallow tabs so we don’t lose focus when editing
                    break
                default:
                    return
                }
                event.accepted = true
            }
        }

        Flow {
            id: tags

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

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

            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: {
                        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
                        const event = events.currentItem
                        if (event.fields.length > 0)
                            events.editing = true
                    }

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