import QtQuick
import QtQml.Models
import Quickshell
import Quickshell.Io
import Quickshell.Services.Mpris
pragma Singleton
pragma ComponentBehavior: Bound

/**
 * A service that provides easy access to the active Mpris player.
 */
Singleton {
    id: root
    property MprisPlayer trackedPlayer: null
    property MprisPlayer activePlayer: trackedPlayer ?? Mpris.players.values[0] ?? null
    signal trackChanged(reverse: bool)

    property bool __reverse: false

    property var activeTrack

    Instantiator {
        model: Mpris.players

        Connections {
            required property MprisPlayer modelData
            target: modelData

            Component.onCompleted: {
                if (root.trackedPlayer == null || modelData.isPlaying) {
                    root.trackedPlayer = modelData
                }
            }

            Component.onDestruction: {
                if (root.trackedPlayer == null || root.trackedPlayer.playbackState !== MprisPlaybackState.Playing) {
                    for (const player of Mpris.players.values) {
                        if (player.playbackState === MprisPlaybackState.Playing) {
                            root.trackedPlayer = player
                            break
                        }
                    }

                    if (trackedPlayer == null && Mpris.players.values.length != 0) {
                        trackedPlayer = Mpris.players.values[0]
                    }
                }
            }

            function onPlaybackStateChanged() {
                if (root.trackedPlayer !== modelData) root.trackedPlayer = modelData
            }
        }
    }

    Connections {
        target: activePlayer

        function onPostTrackChanged() {
            root.updateTrack()
        }

        function onTrackArtUrlChanged() {
            if (root.activePlayer.uniqueId == root.activeTrack.uniqueId && root.activePlayer.trackArtUrl != root.activeTrack.artUrl) {
                const r = root.__reverse
                root.updateTrack()
                root.__reverse = r
            }
        }
    }

    onActivePlayerChanged: this.updateTrack()

    function updateTrack() {
        this.activeTrack = {
            uniqueId: this.activePlayer?.uniqueId ?? 0,
            artUrl: this.activePlayer?.trackArtUrl ?? "",
            title: this.activePlayer?.trackTitle || "Unknown Title",
            artist: this.activePlayer?.trackArtist || "Unknown Artist",
            album: this.activePlayer?.trackAlbum || "Unknown Album",
        }

        this.trackChanged(__reverse)
        this.__reverse = false
    }

    property bool isPlaying: this.activePlayer && this.activePlayer.playbackState === MprisPlaybackState.Playing
    property bool canTogglePlaying: this.activePlayer?.canTogglePlaying ?? false
    function togglePlaying() {
        if (this.canTogglePlaying) this.activePlayer.togglePlaying()
    }

    property bool canGoPrevious: this.activePlayer?.canGoPrevious ?? false
    function previous() {
        if (this.canGoPrevious) {
            this.__reverse = true
            this.activePlayer.previous()
        }
    }

    property bool canGoNext: this.activePlayer?.canGoNext ?? false
    function next() {
        if (this.canGoNext) {
            this.__reverse = false
            this.activePlayer.next()
        }
    }

    property bool canChangeVolume: this.activePlayer && this.activePlayer.volumeSupported && this.activePlayer.canControl

    property bool loopSupported: this.activePlayer && this.activePlayer.loopSupported && this.activePlayer.canControl
    property var loopState: this.activePlayer?.loopState ?? MprisLoopState.None
    function setLoopState(loopState) {
        if (this.loopSupported) {
            this.activePlayer.loopState = loopState
        }
    }

    property bool shuffleSupported: this.activePlayer && this.activePlayer.shuffleSupported && this.activePlayer.canControl
    property bool hasShuffle: this.activePlayer?.shuffle ?? false
    function setShuffle(shuffle) {
        if (this.shuffleSupported) {
            this.activePlayer.shuffle = shuffle
        }
    }

    function setActivePlayer(player) {
        const targetPlayer = player ?? Mpris.players[0]

        if (targetPlayer && this.activePlayer) {
            this.__reverse = Mpris.players.indexOf(targetPlayer) < Mpris.players.indexOf(this.activePlayer)
        } else {
            this.__reverse = false
        }

        this.trackedPlayer = targetPlayer
    }

    // Seeking support
    property bool canSeek: this.activePlayer?.canSeek ?? false
    property real position: this.activePlayer?.position ?? 0
    property real length: this.activePlayer?.length ?? 0
    
    function seek(offsetUs) {
        if (this.canSeek && this.activePlayer) {
            this.activePlayer.seek(offsetUs)
        }
    }
    
    function setPosition(trackId, positionUs) {
        if (this.canSeek && this.activePlayer && typeof this.activePlayer.setPosition === "function") {
            this.activePlayer.setPosition(trackId, positionUs)
        } else if (this.canSeek && this.activePlayer) {
            // Fallback to setting position property
            this.activePlayer.position = positionUs
        }
    }

}