#!/usr/bin/python3

from PyQt6.QtCore import pyqtSignal
from PyQt6.QtGui import QDropEvent, QIcon
from PyQt6.QtWidgets import QTreeWidget, QAbstractItemView

from .track import TrackItem


class PlaylistView(QTreeWidget):
    itemDropped = pyqtSignal(QTreeWidget, list)

    def __init__(self, playlist, parent=None):
        super().__init__(parent)

        self.playlist = playlist
        self.app = playlist.app

        playlist.view = self

        self.setDragDropMode(QAbstractItemView.DragDropMode.InternalMove)
        #self.setAcceptDrops(True)
        self.setSelectionMode(QAbstractItemView.SelectionMode.ExtendedSelection)

        self.setColumnCount(4)

        self.play_icon = QIcon.fromTheme(QIcon.ThemeIcon.MediaPlaybackStart)

        headers = [
            "",
            "#",
            "Title",
            "Artist",
            "Album",
            "# Custom Sorting"
        ]

        self.setHeaderLabels(headers)

        self.load_tracks()

        self.itemActivated.connect(self.on_track_activation)

    def on_user_sort(self):
        num_tracks = self.topLevelItemCount()

        i = 0

        while i < num_tracks:
            track_item = self.topLevelItem(i)
            track = track_item.track

            track_item.index_user_sort = i
            track_item.setText(5, str(i + 1))

            self.playlist.tracks[i] = track

            i += 1

        self.app.player.cache_next_track()

    def dropEvent(self, event: QDropEvent):
        # receive items that were dropped and create new items from its tracks (new items bc. widgets can only have
        # one parent)
        if event.source() == self:
            items = self.selectedItems()  # dragged items are always selected items

            self.itemDropped.emit(self, items)

        else:
            items = self.app.gui.dropped

            i = 0

            for item in items:
                track = item.track

                self.playlist.tracks.append(track)

                track_item = TrackItem(track, i, self)

                i += 1

        super().dropEvent(event)

        event.accept()

        self.on_user_sort()

    def dragEnterEvent(self, event):
        # store dragged items in gui.dropped, so the other playlist can receive it
        if event.source() == self:
            items = self.selectedItems()

            self.app.gui.dropped = items

        super().dragEnterEvent(event)

        event.accept()

    def load_tracks(self):
        i = 0

        for track in self.playlist.tracks:
            track_item = TrackItem(track, i, self)

            i += 1

        if not self.topLevelItemCount() == 0:
            self.topLevelItem(0).setIcon(0, self.play_icon)

    def on_track_activation(self, item, column):
        if not self.app.player.current_playlist == self.playlist:
            self.app.player.current_playlist = self.playlist

        index = self.indexOfTopLevelItem(item)
        self.app.player.play_track_in_playlist(index)

    def on_track_change(self, previous_track, track):
        # unmark the previous track and mark the current track as playing
        if previous_track:
            previous_track.item.setIcon(0, QIcon(None))

        if track:
            track.item.setIcon(0, self.play_icon)