// 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

Page {
    id: control

    property bool modified: false
    property Video video

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

    EventFilter {
        id: eventFilter
        sourceModel: eventList
    }

    FileDialog {
        id: videoDialog
        title: qsTr('Open video')
        onAccepted: {
            video.source = currentFile
            const json = JSON.parse(io.read(currentFile+'.events') || '{}')
            eventList.load(json)
            description.text = json['description'] || ''
            modified = false
        }
    }

    FileDialog {
        id: tagsDialog
        title: qsTr('Load tags')
        nameFilters: [qsTr('JSON files (*.json)'), qsTr('All files (*)')]
        onAccepted: eventList.load({ 'tags': JSON.parse(io.read(currentFile)) })
    }

    Keys.forwardTo: [tags, video]

    header: ToolBar {
        horizontalPadding: 0
        RowLayout {
            anchors.fill: parent
            ToolButton {
                action: Action {
                    icon.name: 'document-open'
                    shortcut: StandardKey.Open
                    onTriggered: videoDialog.open()
                }
                focusPolicy: Qt.NoFocus
            }
            Label {
                text: video.loaded ? video.source : ''
                elide: Text.ElideLeft
                Layout.fillWidth: true
            }
            ToolButton {
                action: Action {
                    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
                    }
                    shortcut: StandardKey.Save
                    icon.name: 'document-save'
                    enabled: video.loaded && control.modified
                }
                visible: video.loaded
                opacity: enabled ? 1 : 0.25
                focusPolicy: Qt.NoFocus
            }
        }
    }

    ColumnLayout {
        anchors.fill: parent

        // Description box.
        ColumnLayout {
            spacing: 0
            RowLayout {
                Label {
                    text: qsTr('Description')
                    Layout.fillWidth: true
                }
                Label { text: description.enabled ? qsTr('−') : qsTr('+') }
                TapHandler { onTapped: description.enabled = !description.enabled }
            }

            ScrollView {
                Layout.fillWidth: true
                Layout.preferredHeight: 100
                contentWidth: parent.availableWidth
                padding: 1

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

                TextArea {
                    id: description

                    background: Rectangle { color: palette.base }
                    leftPadding: padding
                    selectByMouse: true
                    wrapMode: Text.Wrap

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

        // Events list.
        ColumnLayout {
            spacing: 0

            RowLayout {
                Label {
                    text: qsTr('Events')
                    Layout.fillWidth: true
                }
                Label { text: qsTr('🔍') }
                TapHandler { onTapped: filter.visible = !filter.visible }
            }

            TextField {
                id: filter
                Layout.fillWidth: true
                placeholderText: qsTr('Filter…')
                visible: false
                onTextChanged: eventFilter.setFilter(text)
            }

            Frame {
                padding: 1
                Layout.fillWidth: true
                Layout.fillHeight: true

                Events {
                    id: events

                    anchors.fill: parent
                    focus: true
                    model: eventFilter
                    tags: eventList.tags

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

                    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
                    }
                }
            }
        }

        // Tag list.
        Frame {
            Layout.fillWidth: true
            Layout.fillHeight: false
            padding: 5

            ColumnLayout {
                width: parent.width
                spacing: 0

                RowLayout {
                    Label {
                        text: qsTr('Tags')
                        Layout.fillWidth: true
                        Layout.alignment: Qt.AlignVCenter
                    }
                    ToolButton {
                        icon.name: 'document-open'
                        Layout.alignment: Qt.AlignVCenter
                        onClicked: tagsDialog.open()
                        focusPolicy:Qt.NoFocus
                    }
                }

                Tags {
                    id: tags
                    model: eventList.tagsOrder.map(tag => eventList.tags[tag])
                    enabled: video.loaded && !events.editing
                    onClicked: {
                        const index = eventList.insert(tag, video.time)
                        // Reset filter if new event doesn’t match.
                        var row = eventFilter.mapFromSource(eventList.index(index, 0)).row
                        if (eventFilter.mapFromSource(eventList.index(index, 0)).row === -1) {
                            filter.text = ''
                            row = index
                        }
                        events.currentIndex = row
                        const event = events.currentItem
                        if (event.fields.length > 0)
                            events.editing = true
                    }
                    Layout.fillWidth: true
                }
            }
        }
    }
}