import argparse
import os
import sys

import symuid
import symuid.library.cmus
from symuid._datetime import datetime_utc_now

# TODO rename module to cmus.py
# after ImportMismatchError on `pytest --doctest-modules` was fixed

_PLAYER_NAME = 'cmus'
_LIBRARY_ID_LENGTH_MIN = 8

def symuid_import_cmus(library_id, cache_path):
    assert len(library_id) >= _LIBRARY_ID_LENGTH_MIN, library_id
    lib = symuid.library.cmus.Cache(cache_path)
    for cmus_track in lib.get_tracks():
        if not os.path.exists(cmus_track.path):
            sys.stderr.write('{!r}: not found\n'.format(cmus_track.path))
        elif cmus_track.play_count > 0:  # check before symuid.Track to improve performance
            symuid_track = symuid.Track(path=cmus_track.path.decode())
            last_count = symuid_track.get_latest_play_count(
                player=_PLAYER_NAME,
                library_id=library_id,
            )
            assert last_count is None or last_count.count <= cmus_track.play_count, \
                (symuid_track.path, last_count.count, cmus_track.play_count)
            if last_count is None or last_count.count != cmus_track.play_count:
                symuid_track.register_play_count(
                    symuid.PlayCount(
                        player=_PLAYER_NAME,
                        library_id=library_id,
                        register_dt=datetime_utc_now(),
                        count=cmus_track.play_count,
                    ),
                    tag_set_cb=lambda track, tag:
                    print('{!r}: set tag {!r}'.format(track.path, tag)),
                )


def _main():
    argparser = argparse.ArgumentParser(description="Import play counts from cmus' cache")
    argparser.add_argument('library_id')
    argparser.add_argument(
        'cache_path',
        nargs='?',
        default=os.path.expanduser('~/.config/cmus/cache'),
        help='(default: %(default)r)',
    )
    args = argparser.parse_args()
    symuid_import_cmus(**vars(args))