musicmuster/app/musicmuster.py

#!/usr/bin/env python

import webbrowser
import os
import sys
import urllib.parse


from datetime import datetime, timedelta
from log import DEBUG, EXCEPTION
from slugify import slugify

from PyQt5.QtCore import Qt, QTimer
from PyQt5.QtWidgets import (
    QApplication,
    QDialog,
    QFileDialog,
    QInputDialog,
    QListWidgetItem,
    QMainWindow,
    QMessageBox,
)

import helpers
import music

from config import Config
from model import (Notes, Playdates, Playlists, Session, Settings, Tracks)
from playlists import Playlist
from songdb import create_track_from_file
from ui.dlg_search_database_ui import Ui_Dialog
from ui.dlg_SelectPlaylist_ui import Ui_dlgSelectPlaylist
from ui.main_window_ui import Ui_MainWindow


class Window(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setupUi(self)

        self.timer = QTimer()
        self.even_tick = True
        self.playing = False
        self.connect_signals_slots()
        self.disable_play_next_controls()

        self.music = music.Music()
        self.current_track = None
        self.current_track_playlist = None
        self.next_track = None
        self.next_track_playlist = None
        self.previous_track = None
        self.previous_track_position = None
        self.spnVolume.setValue(Config.VOLUME_VLC_DEFAULT)

        self.menuTest.menuAction().setVisible(Config.TESTMODE)
        self.set_main_window_size()

        self.visible_playlist = self.tabPlaylist.currentWidget

        self.load_last_playlists()
        self.enable_play_next_controls()
        self.timer.start(Config.TIMER_MS)

    def add_file(self):
        dlg = QFileDialog()
        dlg.setFileMode(QFileDialog.ExistingFiles)
        dlg.setViewMode(QFileDialog.Detail)
        dlg.setDirectory(Config.ROOT)
        dlg.setNameFilter("Music files (*.flac *.mp3)")

        if dlg.exec_():
            with Session() as session:
                for fname in dlg.selectedFiles():
                    track = create_track_from_file(session, fname)
                    # Add to playlist on screen
                    # If we don't specify "repaint=False", playlist will
                    # also be saved to database
                    self.visible_playlist().insert_track(session, track)

    def set_main_window_size(self):
        "Set size of window from database"

        with Session() as session:
            record = Settings.get_int(session, "mainwindow_x")
            x = record.f_int or 1
            record = Settings.get_int(session, "mainwindow_y")
            y = record.f_int or 1
            record = Settings.get_int(session, "mainwindow_width")
            width = record.f_int or 1599
            record = Settings.get_int(session, "mainwindow_height")
            height = record.f_int or 981
            self.setGeometry(x, y, width, height)

    def clear_selection(self):
        if self.visible_playlist():
            self.visible_playlist().clearSelection()

    def closeEvent(self, event):
        "Don't allow window to close when a track is playing"

        if self.music.playing():
            DEBUG("closeEvent() ignored as music is playing")
            event.ignore()
            # TODO notify user
        else:
            DEBUG("closeEvent() accepted")

            with Session() as session:
                record = Settings.get_int(session, "mainwindow_height")
                if record.f_int != self.height():
                    record.update(session, {'f_int': self.height()})

                record = Settings.get_int(session, "mainwindow_width")
                if record.f_int != self.width():
                    record.update(session, {'f_int': self.width()})

                record = Settings.get_int(session, "mainwindow_x")
                if record.f_int != self.x():
                    record.update(session, {'f_int': self.x()})

                record = Settings.get_int(session, "mainwindow_y")
                if record.f_int != self.y():
                    record.update(session, {'f_int': self.y()})

            event.accept()

    def connect_signals_slots(self):
        self.actionAdd_file.triggered.connect(self.add_file)
        self.action_Clear_selection.triggered.connect(self.clear_selection)
        self.actionClosePlaylist.triggered.connect(self.close_playlist)
        self.actionExport_playlist.triggered.connect(self.export_playlist)
        self.actionFade.triggered.connect(self.fade)
        self.actionMoveSelected.triggered.connect(self.move_selected)
        self.actionNewPlaylist.triggered.connect(self.create_playlist)
        self.actionOpenPlaylist.triggered.connect(self.open_playlist)
        self.actionPlay_next.triggered.connect(self.play_next)
        self.actionSearch_database.triggered.connect(self.search_database)
        self.actionSelect_next_track.triggered.connect(self.select_next_track)
        self.actionSelect_previous_track.triggered.connect(
            self.select_previous_track)
        self.actionSetNext.triggered.connect(self.set_next_track)
        self.actionSkip_next.triggered.connect(self.play_next)
        self.actionSkipToEnd.triggered.connect(self.test_skip_to_end)
        self.actionSkipToFade.triggered.connect(self.test_skip_to_fade)
        self.actionStop.triggered.connect(self.stop)
        self.actionTestFunction.triggered.connect(self.test_function)
        self.btnAddFile.clicked.connect(self.add_file)
        self.btnAddNote.clicked.connect(self.insert_note)
        self.btnDatabase.clicked.connect(self.search_database)
        self.btnFade.clicked.connect(self.fade)
        self.btnPlay.clicked.connect(self.play_next)
        self.btnSetNext.clicked.connect(self.set_next_track)
        self.btnSongInfo.clicked.connect(self.song_info_search)
        self.btnStop.clicked.connect(self.stop)
        self.spnVolume.valueChanged.connect(self.change_volume)
        self.tabPlaylist.currentChanged.connect(self.tab_change)

        self.timer.timeout.connect(self.tick)

    def create_playlist(self):
        "Create new playlist"

        dlg = QInputDialog(self)
        dlg.setInputMode(QInputDialog.TextInput)
        dlg.setLabelText("Playlist name:")
        dlg.resize(500, 100)
        ok = dlg.exec()
        if ok:
            with Session() as session:
                playlist = Playlists.new(session, dlg.textValue())
                self.load_playlist(session, playlist)

    def change_volume(self, volume):
        "Change player maximum volume"

        DEBUG(f"change_volume({volume})")

        self.music.set_volume(volume)

    def close_playlist(self):
        with Session() as session:
            self.visible_playlist().db.close(session)
            index = self.tabPlaylist.currentIndex()
            self.tabPlaylist.removeTab(index)

    def create_note(self, session, text):
        """
        Create note

        If a row is selected, set note row to be rows above. Otherwise,
        set note row to be end of playlist.

        Return note.
        """

        row = self.visible_playlist().get_selected_row()
        if row is None:
            row = self.visible_playlist().rowCount()
        DEBUG(f"musicmuster.create_note(text={text}): row={row}")

        note = Notes.add_note(
            session, self.visible_playlist().id, row, text)

        return note

    def disable_play_next_controls(self):
        DEBUG("disable_play_next_controls()")
        self.actionPlay_next.setEnabled(False)

    def enable_play_next_controls(self):
        DEBUG("enable_play_next_controls()")
        self.actionPlay_next.setEnabled(True)

    def export_playlist(self):
        "Export the current playlist to an m3u file"

        if not self.visible_playlist():
            return

        # Get output filename
        pathspec = QFileDialog.getSaveFileName(
            self, 'Save Playlist',
            directory=f"{self.visible_playlist().name}.m3u",
            filter="M3U files (*.m3u);;All files (*.*)"
        )
        if not pathspec:
            return

        path = pathspec[0]

        if not path.endswith(".m3u"):
            path += ".m3u"

        # Get playlist db object
        with Session() as session:
            p = Playlists.get_playlist(session, self.visible_playlist().id)
            with open(path, "w") as f:
                # Required directive on first line
                f.write("#EXTM3U\n")
                for track in p.get_tracks():
                    f.write(
                        "#EXTINF:"
                        f"{int(track.duration / 1000)},"
                        f"{track.title} - "
                        f"{track.artist}"
                        "\n"
                        f"{track.path}"
                        "\n"
                    )

    def fade(self):
        "Fade currently playing track"

        if not self.current_track:
            return

        self.enable_play_next_controls()
        self.previous_track = self.current_track
        self.previous_track_position = self.music.fade()

    def insert_note(self):
        "Add non-track row to playlist"

        dlg = QInputDialog(self)
        dlg.setInputMode(QInputDialog.TextInput)
        dlg.setLabelText("Note:")
        dlg.resize(500, 100)
        ok = dlg.exec()
        if ok:
            with Session() as session:
                note = self.create_note(session, dlg.textValue())
                self.visible_playlist().insert_note(session, note)

    def load_last_playlists(self):
        "Load the playlists that we loaded at end of last session"

        with Session() as session:
            for playlist in Playlists.get_last_used(session):
                DEBUG(
                    f"load_last_playlists(), playlist.name={playlist.name}, "
                    f"playlist.id={playlist.id}")
                self.load_playlist(session, playlist)

    def load_playlist(self, session, playlist_db):
        """
        Take the passed database object, create a playlist display, attach
        the database object, get it populated and then add tab.
        """

        playlist_table = Playlist(self)
        playlist_table.populate(session, playlist_db)
        idx = self.tabPlaylist.addTab(playlist_table, playlist_db.name)
        self.tabPlaylist.setCurrentIndex(idx)

    def move_selected(self):
        "Move selected rows to another playlist"

        with Session() as session:
            playlists = list(
                set(Playlists.get_all_playlists(session)) -
                {self.visible_playlist().db}
            )
            dlg = SelectPlaylistDialog(self, playlists=playlists)
            dlg.exec()
            if not dlg.plid:
                return

            # If destination playlist is visible, we need to add the moved
            # tracks to it. If not, they will be automatically loaded when
            # the playlistis opened.
            destination_playlist = None
            for tab in range(self.tabPlaylist.count()):
                if self.tabPlaylist.widget(tab).db.id == dlg.plid:
                    destination_playlist = self.tabPlaylist.widget(tab)
                    break

            rows = []
            for (row, track_id) in (
                    self.visible_playlist().get_selected_rows_and_tracks()):
                rows.append(row)
                # Update database
                PlaylistTracks.move_track(
                    session, self.visible_playlist().db.id, row, dlg.plid)
                # Update destination playlist if visible
                if destination_playlist:
                    destination_playlist.add_track(
                        session, Tracks.track_from_id(session, track_id))

        # Update source playlist
        self.visible_playlist().remove_rows(rows)

    def play_next(self):
        """
        Play next track.

        If there is no next track set, return.
        If there's currently a track playing, fade it.
        Move next track to current track.
        Play (new) current.
        Update playlist "current track" metadata
        Cue up next track in playlist if there is one.
        Tell database to record it as played
        Remember it was played for this session
        Update metadata and headers, and repaint
        """

        # If there is no next track set, return.
        if not self.next_track:
            return

        DEBUG(
            "play_next(), "
            f"next_track={self.next_track.title if self.next_track else None} "
            "current_track="
            f"{self.current_track.title if self.current_track else None}"
        )

        with Session() as session:
            # Stop current track, if any
            self.stop_playing()

            # Play next track
            self.current_track = self.next_track
            self.current_track_playlist = self.next_track_playlist
            self.next_track = None
            self.next_track_playlist = None
            self.music.play(self.current_track.path)

            # Update metadata
            next_track_id = self.current_track_playlist.play_started()

            if next_track_id is not None:
                self.next_track = Tracks.get_track(session, next_track_id)
                self.next_track_playlist = self.current_track_playlist
                # Check we can read it
                if not os.access(self.next_track.path, os.R_OK):
                    self.show_warning(
                        "Can't read next track",
                        self.next_track.path)
            else:
                self.next_track = self.next_track_playlist = None

            # Tell database to record it as played
            self.current_track.update_lastplayed()
            Playdates.add_playdate(session, self.current_track)

            self.disable_play_next_controls()
            self.update_headers()

            # Set time clocks
            now = datetime.now()
            self.label_start_tod.setText(now.strftime("%H:%M:%S"))
            silence_at = self.current_track.silence_at
            silence_time = now + timedelta(milliseconds=silence_at)
            self.label_silent_tod.setText(silence_time.strftime("%H:%M:%S"))
            self.label_fade_length.setText(helpers.ms_to_mmss(
                silence_at - self.current_track.fade_at
            ))

    def play_previous(self):
        "Resume playing last track"

        # TODO
        pass

    def search_database(self):
        with Session() as session:
            dlg = DbDialog(self, session)
            dlg.exec()

    def open_playlist(self):
        with Session() as session:
            playlists = Playlists.get_all_closed_playlists(session)
            dlg = SelectPlaylistDialog(self, playlists=playlists)
            dlg.exec()
            if dlg.plid:
                playlist = Playlists.open(session, dlg.plid)
                self.load_playlist(session, playlist)

    def select_next_track(self):
        "Select next or first track in playlist"

        self.visible_playlist().select_next_track()

    def select_previous_track(self):
        "Select previous or first track in playlist"

        self.visible_playlist().select_previous_track()

    def set_next_track(self, next_track_id=None):
        "Set selected track as next"

        with Session() as session:
            if not next_track_id:
                next_track_id = self.visible_playlist().set_selected_as_next()
            if next_track_id:
                if self.next_track_playlist != self.visible_playlist():
                    if self.next_track_playlist:
                        self.next_track_playlist.clear_next()
                    self.next_track_playlist = self.visible_playlist()
                self.next_track = Tracks.get_track(session, next_track_id)
            self.update_headers()

    def show_warning(self, title, msg):
        "Display a warning to user"

        QMessageBox.warning(None, title, msg, buttons=QMessageBox.Cancel)

    def song_info_search(self):
        """
        Open browser tabs for Wikipedia and Songfacts, searching for
        the first that exists of:
            - selected track
            - current track
            - next track
        """

        title = self.visible_playlist().get_selected_title()
        if not title:
            if self.current_track:
                title = self.current_track.title
        if not title:
            if self.next_track:
                title = self.next_track.title
        if title:
            # Wikipedia
            str = urllib.parse.quote_plus(title)
            url = f"https://www.wikipedia.org/w/index.php?search={str}"
            webbrowser.open(url, new=2)
            # Songfacts
            slug = slugify(title, replacements=([["'", ""]]))
            url = f"https://www.songfacts.com/search/songs/{slug}"
            webbrowser.open(url, new=2)

    def stop(self):
        "Stop playing immediately"

        DEBUG("musicmuster.stop()")

        self.stop_playing(fade=False)
        self.enable_play_next_controls()

    def stop_playing(self, fade=True):
        "Stop playing current track"

        DEBUG("musicmuster.stop_playing()")

        if not self.music.playing():
            return

        self.previous_track_position = self.music.get_position()
        if fade:
            self.music.fade()
        else:
            self.music.stop()
        self.current_track_playlist.clear_current()

        # Shuffle tracks along
        self.previous_track = self.current_track

        self.update_headers()

    def tab_change(self):
        "User has changed tabs"

        pass

    def test_function(self):
        "Placeholder for test function"

        import ipdb
        ipdb.set_trace()

    def test_skip_to_end(self):
        "Skip current track to 1 second before silence"

        if not self.playing():
            return

        self.music.set_position(self.get_current_silence_at() - 1000)

    def test_skip_to_fade(self):
        "Skip current track to 1 second before fade"

        if not self.music.playing():
            return

        self.music.set_position(self.get_current_fade_at() - 1000)

    def tick(self):
        """
        Update screen

        The Time of Day clock is updated every tick (500ms).

        All other timers are updated every second. As the timers have a
        one-second resolution, updating every 500ms can result in some
        timers updating and then, 500ms later, other timers updating. That
        looks odd.
        """

        now = datetime.now()

        self.lblTOD.setText(now.strftime("%H:%M:%S"))

        self.even_tick = not self.even_tick
        if not self.even_tick:
            return

        if self.music.playing():
            self.playing = True
            playtime = self.music.get_playtime()
            time_to_fade = (self.current_track.fade_at - playtime)
            time_to_silence = (self.current_track.silence_at - playtime)
            time_to_end = (self.current_track.duration - playtime)

            # Elapsed time
            if time_to_end < 500:
                self.label_elapsed_timer.setText(
                    helpers.ms_to_mmss(self.current_track.duration)
                )
            else:
                self.label_elapsed_timer.setText(helpers.ms_to_mmss(playtime))

            # Time to fade
            self.label_fade_timer.setText(helpers.ms_to_mmss(time_to_fade))

            # Time to silence
            if time_to_silence < 5000:
                self.frame_silent.setStyleSheet(
                    f"background: {Config.COLOUR_ENDING_TIMER}"
                )
                self.enable_play_next_controls()
            elif time_to_fade < 500:
                self.frame_silent.setStyleSheet(
                    f"background: {Config.COLOUR_WARNING_TIMER}"
                )
                self.enable_play_next_controls()
            else:
                self.frame_silent.setStyleSheet("")

            self.label_silent_timer.setText(
                helpers.ms_to_mmss(time_to_silence)
            )

            # Time to end
            self.label_end_timer.setText(helpers.ms_to_mmss(time_to_end))

        else:
            if self.playing:
                self.label_end_timer.setText("00:00")
                self.frame_silent.setStyleSheet("")
                self.current_track_playlist.play_stopped()
                self.playing = False
                self.previous_track = self.current_track
                self.current_track = None
                self.current_track_playlist = None
                self.previous_track_position = 0
                self.update_headers()
                # Release player
                self.music.stop()

    def update_headers(self):
        "Update last / current / next track headers"

        try:
            self.hdrPreviousTrack.setText(
                f"{self.previous_track.title} - "
                f"{self.previous_track.artist}"
            )
        except AttributeError:
            self.hdrPreviousTrack.setText("")

        try:
            self.hdrCurrentTrack.setText(
                f"{self.current_track.title} - "
                f"{self.current_track.artist}"
            )
        except AttributeError:
            self.hdrCurrentTrack.setText("")

        try:
            self.hdrNextTrack.setText(
                f"{self.next_track.title} - "
                f"{self.next_track.artist}"
            )
        except AttributeError:
            self.hdrNextTrack.setText("")


class DbDialog(QDialog):
    def __init__(self, parent, session):
        super().__init__(parent)
        self.session = session
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)
        self.ui.searchString.textEdited.connect(self.chars_typed)
        self.ui.matchList.itemDoubleClicked.connect(self.double_click)
        self.ui.btnAdd.clicked.connect(self.add_selected)
        self.ui.btnAddClose.clicked.connect(self.add_selected_and_close)
        self.ui.btnClose.clicked.connect(self.close)
        self.ui.matchList.itemSelectionChanged.connect(self.selection_changed)

        record = Settings.get_int(self.session, "dbdialog_width")
        width = record.f_int or 800
        record = Settings.get_int(self.session, "dbdialog_height")
        height = record.f_int or 600
        self.resize(width, height)

    def __del__(self):
        record = Settings.get_int(self.session, "dbdialog_height")
        if record.f_int != self.height():
            record.update(self.session, {'f_int': self.height()})

        record = Settings.get_int(self.session, "dbdialog_width")
        if record.f_int != self.width():
            record.update(self.session, {'f_int': self.width()})

    def add_selected(self):
        if not self.ui.matchList.selectedItems():
            return

        item = self.ui.matchList.currentItem()
        track_id = item.data(Qt.UserRole)
        self.add_track(track_id)

    def add_selected_and_close(self):
        self.add_selected()
        self.close()

    def chars_typed(self, s):
        if len(s) > 0:
            matches = Tracks.search_titles(self.session, s)
            self.ui.matchList.clear()
            if matches:
                for track in matches:
                    t = QListWidgetItem()
                    t.setText(
                        f"{track.title} - {track.artist} "
                        f"[{helpers.ms_to_mmss(track.duration)}]"
                    )
                    t.setData(Qt.UserRole, track.id)
                    self.ui.matchList.addItem(t)

    def double_click(self, entry):
        track_id = entry.data(Qt.UserRole)
        self.add_track(track_id)
        # Select search text to make it easier for next search
        self.select_searchtext()

    def add_track(self, track_id):
        track = Tracks.track_from_id(self.session, track_id)
        # Add to playlist on screen
        # If we don't specify "repaint=False", playlist will
        # also be saved to database
        self.parent().visible_playlist().insert_track(
            self.session, track)
        # Select search text to make it easier for next search
        self.select_searchtext()

    def select_searchtext(self):
        self.ui.searchString.selectAll()
        self.ui.searchString.setFocus()

    def selection_changed(self):
        if not self.ui.matchList.selectedItems():
            return

        item = self.ui.matchList.currentItem()
        track_id = item.data(Qt.UserRole)
        self.ui.dbPath.setText(Tracks.get_path(self.session, track_id))


class SelectPlaylistDialog(QDialog):
    def __init__(self, parent=None, playlists=None):
        super().__init__(parent)

        if playlists is None:
            return
        self.ui = Ui_dlgSelectPlaylist()
        self.ui.setupUi(self)
        self.ui.lstPlaylists.itemDoubleClicked.connect(self.list_doubleclick)
        self.ui.buttonBox.accepted.connect(self.open)
        self.ui.buttonBox.rejected.connect(self.close)
        self.plid = None

        with Session() as session:
            record = Settings.get_int(session, "select_playlist_dialog_width")
            width = record.f_int or 800
            record = Settings.get_int(session, "select_playlist_dialog_height")
            height = record.f_int or 600
            self.resize(width, height)

        for (plid, plname) in [(a.id, a.name) for a in playlists]:
            p = QListWidgetItem()
            p.setText(plname)
            p.setData(Qt.UserRole, plid)
            self.ui.lstPlaylists.addItem(p)

    def __del__(self):
        with Session() as session:
            record = Settings.get_int(session, "select_playlist_dialog_height")
            if record.f_int != self.height():
                record.update(session, {'f_int': self.height()})

            record = Settings.get_int(session, "select_playlist_dialog_width")
            if record.f_int != self.width():
                record.update(session, {'f_int': self.width()})

    def list_doubleclick(self, entry):
        self.plid = entry.data(Qt.UserRole)
        self.accept()

    def open(self):
        if self.ui.lstPlaylists.selectedItems():
            item = self.ui.lstPlaylists.currentItem()
            self.plid = item.data(Qt.UserRole)
            self.accept()


def main():
    try:
        app = QApplication(sys.argv)
        win = Window()
        win.show()
        sys.exit(app.exec())
    except Exception:
        EXCEPTION("Unhandled Exception caught by musicmuster.main()")


if __name__ == "__main__":
    main()