import QtQuick
import QtQuick.Controls as QQC2
import QtQuick.Dialogs
import QtQuick.Layouts
import org.kde.kirigami as Kirigami
import org.kde.ki18n

Kirigami.Page {
    id: page

    property url initialUrl
    readonly property alias mediaTitle: mpv.mediaTitle
    readonly property alias translator: translator

    signal aboutRequested()
    signal settingsRequested()
    signal fullScreenToggled()

    title: KI18n.i18nc("@title", "Player")
    padding: 0

    actions: [
        Kirigami.Action {
            icon.name: "document-open"
            text: KI18n.i18nc("@action", "Open File…")
            shortcut: StandardKey.Open
            onTriggered: fileDialog.open()
        },
        Kirigami.Action {
            icon.name: "view-fullscreen"
            text: KI18n.i18nc("@action", "Full Screen")
            displayHint: Kirigami.DisplayHint.IconOnly
            shortcut: "F"
            onTriggered: page.fullScreenToggled()
        },
        Kirigami.Action {
            icon.name: "configure"
            text: KI18n.i18nc("@action", "Settings")
            displayHint: Kirigami.DisplayHint.AlwaysHide
            shortcut: StandardKey.Preferences
            onTriggered: page.settingsRequested()
        },
        Kirigami.Action {
            icon.name: "help-about"
            text: KI18n.i18nc("@action", "About QtPotato")
            displayHint: Kirigami.DisplayHint.AlwaysHide
            onTriggered: page.aboutRequested()
        }
    ]

    Component.onCompleted: {
        if (page.initialUrl.toString().length > 0) {
            mpv.loadFile(page.initialUrl)
        }
    }

    function formatTime(totalSeconds: real): string {
        const s = Math.max(0, Math.floor(totalSeconds))
        const h = Math.floor(s / 3600)
        const m = Math.floor((s % 3600) / 60)
        const sec = String(s % 60).padStart(2, "0")
        return h > 0 ? `${h}:${String(m).padStart(2, "0")}:${sec}` : `${m}:${sec}`
    }

    Shortcut {
        sequence: "Space"
        onActivated: mpv.togglePause()
    }
    Shortcut {
        sequence: "Left"
        onActivated: mpv.seek(mpv.position - 5)
    }
    Shortcut {
        sequence: "Right"
        onActivated: mpv.seek(mpv.position + 5)
    }
    // Same keys as mpv: z shows subtitles earlier, x later.
    Shortcut {
        sequence: "Z"
        enabled: mpv.fileLoaded
        onActivated: page.nudgeSubtitleDelay(-0.1)
    }
    Shortcut {
        sequence: "X"
        enabled: mpv.fileLoaded
        onActivated: page.nudgeSubtitleDelay(0.1)
    }

    function nudgeSubtitleDelay(seconds: real) {
        const delay = mpv.subtitleDelay + seconds
        mpv.subtitleDelay = delay
        mpv.showText(KI18n.i18nc("@info:osd", "Subtitle delay: %1 ms", Math.round(delay * 1000)))
    }

    TranslationService {
        id: translator
        onTranslated: (subtitleUrl, fromCache) => {
            mpv.showSecondarySubtitleFile(subtitleUrl,
                KI18n.i18nc("@item:inlistbox subtitle track, %1 is a language", "%1 (translated)", QtPotatoSettings.targetLanguage))
            mpv.showText(fromCache
                ? KI18n.i18nc("@info:osd", "Loaded the saved translation")
                : KI18n.i18nc("@info:osd", "Translation ready"))
        }
    }

    Connections {
        target: mpv
        // A translation belongs to the file it was started for.
        function onCurrentUrlChanged() {
            translator.cancel()
        }
    }

    function isSubtitleFile(url: url): bool {
        return /\.(srt|ass|ssa|vtt|sub|sup)$/i.test(url.toString())
    }

    FileDialog {
        id: fileDialog
        title: KI18n.i18nc("@title:window", "Open Video")
        nameFilters: [
            KI18n.i18nc("@item:inlistbox file filter", "Video files (*.mkv *.mp4 *.webm *.avi *.mov *.m4v *.ts *.flv *.wmv)"),
            KI18n.i18nc("@item:inlistbox file filter", "All files (*)")
        ]
        onAccepted: mpv.loadFile(selectedFile)
    }

    ColumnLayout {
        anchors.fill: parent
        spacing: 0

        MpvItem {
            id: mpv
            Layout.fillWidth: true
            Layout.fillHeight: true

            Rectangle {
                anchors.fill: parent
                color: "black"
                visible: !mpv.fileLoaded
                z: -1
            }

            Kirigami.PlaceholderMessage {
                anchors.centerIn: parent
                width: parent.width - Kirigami.Units.gridUnit * 4
                visible: !mpv.fileLoaded
                icon.name: "video-symbolic"
                text: KI18n.i18nc("@info:placeholder", "No video open")
                explanation: KI18n.i18nc("@info:placeholder", "Open a file or drop one here")
                helpfulAction: page.actions[0]
            }

            MouseArea {
                anchors.fill: parent
                onClicked: mpv.togglePause()
                onDoubleClicked: page.fullScreenToggled()
            }

            DropArea {
                anchors.fill: parent
                onDropped: drop => {
                    if (!drop.hasUrls) {
                        return
                    }
                    const url = drop.urls[0]
                    if (mpv.fileLoaded && page.isSubtitleFile(url)) {
                        mpv.addSubtitleFile(url)
                    } else {
                        mpv.loadFile(url)
                    }
                }
            }
        }

        QQC2.ToolBar {
            Layout.fillWidth: true
            position: QQC2.ToolBar.Footer

            RowLayout {
                anchors.fill: parent
                spacing: Kirigami.Units.smallSpacing

                QQC2.ToolButton {
                    enabled: mpv.fileLoaded
                    focusPolicy: Qt.NoFocus
                    icon.name: mpv.paused || !mpv.fileLoaded ? "media-playback-start" : "media-playback-pause"
                    text: mpv.paused || !mpv.fileLoaded ? KI18n.i18nc("@action:button", "Play") : KI18n.i18nc("@action:button", "Pause")
                    display: QQC2.AbstractButton.IconOnly
                    onClicked: mpv.togglePause()

                    QQC2.ToolTip.text: text
                    QQC2.ToolTip.visible: hovered
                    QQC2.ToolTip.delay: Kirigami.Units.toolTipDelay
                }

                QQC2.Label {
                    text: page.formatTime(seekBar.pressed ? seekBar.value : mpv.position)
                    font.features: { "tnum": 1 }
                }

                QQC2.Slider {
                    id: seekBar
                    Layout.fillWidth: true
                    enabled: mpv.fileLoaded && mpv.duration > 0
                    focusPolicy: Qt.NoFocus
                    from: 0
                    to: Math.max(mpv.duration, 1)
                    onMoved: mpv.seek(value)

                    // Follow playback, but not while the user is dragging the handle.
                    Binding on value {
                        value: mpv.position
                        when: !seekBar.pressed
                        restoreMode: Binding.RestoreNone
                    }
                }

                QQC2.Label {
                    text: page.formatTime(mpv.duration)
                    font.features: { "tnum": 1 }
                }

                QQC2.ToolButton {
                    id: subtitleButton
                    enabled: mpv.fileLoaded
                    focusPolicy: Qt.NoFocus
                    checkable: true
                    checked: subtitlePopup.visible
                    icon.name: "media-view-subtitles-symbolic"
                    text: KI18n.i18nc("@action:button", "Subtitles")
                    display: QQC2.AbstractButton.IconOnly
                    onClicked: subtitlePopup.visible ? subtitlePopup.close() : subtitlePopup.open()

                    QQC2.ToolTip.text: text
                    QQC2.ToolTip.visible: hovered && !subtitlePopup.visible
                    QQC2.ToolTip.delay: Kirigami.Units.toolTipDelay

                    SubtitlePopup {
                        id: subtitlePopup
                        objectName: "subtitlePopup"
                        mpv: mpv
                        translator: translator
                        onSettingsRequested: page.settingsRequested()
                        x: subtitleButton.width - width
                        y: -height - Kirigami.Units.smallSpacing
                    }
                }
            }
        }
    }
}