# This file is part of beets.
# Copyright 2019, Rahul Ahuja.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

"""Update library's tags using Beatport."""

from beets import library, ui, util
from beets.autotag.hooks import AlbumMatch, TrackMatch
from beets.plugins import BeetsPlugin, apply_item_changes

from .beatport import BeatportPlugin


class BPSyncPlugin(BeetsPlugin):
    def __init__(self):
        super().__init__()
        self.beatport_plugin = BeatportPlugin()
        self.beatport_plugin.setup()

    def commands(self):
        cmd = ui.Subcommand("bpsync", help="update metadata from Beatport")
        cmd.parser.add_option(
            "-p",
            "--pretend",
            action="store_true",
            help="show all changes but do nothing",
        )
        cmd.parser.add_option(
            "-m",
            "--move",
            action="store_true",
            dest="move",
            help="move files in the library directory",
        )
        cmd.parser.add_option(
            "-M",
            "--nomove",
            action="store_false",
            dest="move",
            help="don't move files in library",
        )
        cmd.parser.add_option(
            "-W",
            "--nowrite",
            action="store_false",
            default=None,
            dest="write",
            help="don't write updated metadata to files",
        )
        cmd.parser.add_format_option()
        cmd.func = self.func
        return [cmd]

    def func(self, lib, opts, args):
        """Command handler for the bpsync function."""
        move = ui.should_move(opts.move)
        pretend = opts.pretend
        write = ui.should_write(opts.write)

        self.singletons(lib, args, move, pretend, write)
        self.albums(lib, args, move, pretend, write)

    def singletons(self, lib, query, move, pretend, write):
        """Retrieve and apply info from the autotagger for items matched by
        query.
        """
        for item in lib.items(query + ["singleton:true"]):
            if not item.mb_trackid:
                self._log.info(
                    "Skipping singleton with no mb_trackid: {}", item
                )
                continue

            if not self.is_beatport_track(item):
                self._log.info(
                    "Skipping non-{.beatport_plugin.data_source} singleton: {}",
                    self,
                    item,
                )
                continue

            # Apply.
            trackinfo = self.beatport_plugin.track_for_id(item.mb_trackid)
            with lib.transaction():
                TrackMatch(0, trackinfo, item).apply_metadata()
                apply_item_changes(lib, item, move, pretend, write)

    @staticmethod
    def is_beatport_track(item):
        return (
            item.get("data_source") == BeatportPlugin.data_source
            and item.mb_trackid.isnumeric()
        )

    def get_album_tracks(self, album):
        if not album.mb_albumid:
            self._log.info("Skipping album with no mb_albumid: {}", album)
            return False
        if not album.mb_albumid.isnumeric():
            self._log.info(
                "Skipping album with invalid {.beatport_plugin.data_source} ID: {}",
                self,
                album,
            )
            return False
        items = list(album.items())
        if album.get("data_source") == self.beatport_plugin.data_source:
            return items
        if not all(self.is_beatport_track(item) for item in items):
            self._log.info(
                "Skipping non-{.beatport_plugin.data_source} release: {}",
                self,
                album,
            )
            return False
        return items

    def albums(self, lib, query, move, pretend, write):
        """Retrieve and apply info from the autotagger for albums matched by
        query and their items.
        """
        # Process matching albums.
        for album in lib.albums(query):
            # Do we have a valid Beatport album?
            items = self.get_album_tracks(album)
            if not items:
                continue

            # Get the Beatport album information.
            albuminfo = self.beatport_plugin.album_for_id(album.mb_albumid)
            if not albuminfo:
                self._log.info(
                    "Release ID {0.mb_albumid} not found for album {0}", album
                )
                continue

            beatport_trackid_to_trackinfo = {
                track.track_id: track for track in albuminfo.tracks
            }
            library_trackid_to_item = {
                int(item.mb_trackid): item for item in items
            }
            item_info_pairs = [
                (item, beatport_trackid_to_trackinfo[track_id])
                for track_id, item in library_trackid_to_item.items()
            ]

            self._log.info("applying changes to {}", album)
            with lib.transaction():
                AlbumMatch(0, albuminfo, dict(item_info_pairs)).apply_metadata()
                changed = False
                # Find any changed item to apply Beatport changes to album.
                any_changed_item = items[0]
                for item in items:
                    item_changed = ui.show_model_changes(item)
                    changed |= item_changed
                    if item_changed:
                        any_changed_item = item
                        apply_item_changes(lib, item, move, pretend, write)

                if pretend or not changed:
                    continue

                # Update album structure to reflect an item in it.
                for key in library.Album.item_keys:
                    album[key] = any_changed_item[key]
                album.store()

                # Move album art (and any inconsistent items).
                if move and lib.directory in util.ancestry(items[0].path):
                    self._log.debug("moving album {}", album)
                    album.move()