// SPDX-License-Identifier: Unlicense

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

Page {
    id: control

    property bool modified: false
    property Video video

    function clear() {
        description.clear()
        events.clear()
    }

    function save() {
        modified = false
        return {
            meta: {
                version: Qt.application.version,
                video: video.source.toString(),
                description: description.text
            },
            tags: tags.model,
            events: events.save()
        }
    }

    function load(data) {
        if (data.meta.description !== undefined)
            description.text = data.meta.description
        if (data.tags !== undefined)
            tags.model = data.tags
        events.load(data.events)
        modified = false
    }

    FileDialog {
        id: videoDialog
        title: qsTr('Open video')
        onAccepted: {
            clear()
            video.source = currentFile
            const events = io.read(video.source+'.events')
            if (events)
                load(JSON.parse(events))
        }
    }

    FileDialog {
        id: tagsDialog
        title: qsTr('Load tags')
        nameFilters: [qsTr('JSON files (*.json)'), qsTr('All files (*)')]
        onAccepted: tags.model = 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: io.write(video.source+'.events', JSON.stringify(save()))
                    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
            Label { text: qsTr('Events') }
            Frame {
                padding: 1
                Layout.fillWidth: true
                Layout.fillHeight: true

                Events {
                    id: events

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

                    onEditingChanged: video.pause(editing)
                    onChanged: modified = true

                    MouseArea {
                        anchors.fill: parent
                        enabled: !parent.editing
                        onPressed: {
                            const index = events.indexAt(mouse.x, mouse.y)
                            if (index !== -1) {
                                events.currentIndex = index
                                video.seek(events.itemAtIndex(index).time)
                            }
                            forceActiveFocus()
                        }
                    }
                }
            }
        }

        Page {
            Layout.fillWidth: true
            Layout.fillHeight: false

            StackLayout {
                currentIndex: bar.currentIndex
                implicitHeight: children[currentIndex].implicitHeight
                width: parent.width

                Frame {
                    padding: 5
                    enabled: visible
                    Layout.fillWidth: true

                    ColumnLayout {
                        width: parent.width
                        spacing: 0

                        RowLayout {
                            Label {
                                text: qsTr('Tags')
                                Layout.fillWidth: true
                            }
                            ToolButton {
                                icon.name: 'document-open'
                                Layout.alignment: Qt.AlignTop
                                onClicked: tagsDialog.open()
                                focusPolicy:Qt.NoFocus
                            }
                        }
                        Tags {
                            id: tags
                            model: JSON.parse(io.read('qrc:/tags.json'))
                            enabled: video.loaded && !events.editing
                            onClicked: events.create(video.time, tag, fields)
                            Layout.fillWidth: true
                        }
                    }
                }

                Frame {
                    padding: 5
                    enabled: visible
                    Layout.fillWidth: true

                    Filter {
                        id: filter
                        tags: tags.model
                        width: parent.width
                        onChanged: print('filter changed')
                    }
                }
            }

            footer: TabBar {
                id: bar
                Layout.fillWidth: true
                ActionGroup { id: tabActions }
                Repeater {
                    model: [
                        { text: qsTr('&Annotate'), shortcut: qsTr('Alt+A') },
                        { text: qsTr('&Filter'), shortcut: qsTr('Alt+F') }
                    ]
                    delegate: TabButton {
                        action: Action {
                            ActionGroup.group: tabActions
                            shortcut: modelData.shortcut
                        }
                        text: modelData.text
                        focusPolicy: Qt.NoFocus
                        padding: 5
                        onClicked: TabBar.tabBar.setCurrentIndex(index)
                    }
                }
            }
        }
    }
}