# Copyright 2021 (c) Anna Schumaker.
import datetime
import mutagen
import re

class Metadata:
    def __init__(self, filepath):
        self.path = filepath
        self.file = None

    def __enter__(self):
        self.file = mutagen.File(self.path)
        return self if self.file else None

    def __exit__(self, exp_type, exp_value, traceback):
        self.file = None
        return (exp_type == None) or (exp_type == AttributeError)

    def album(self):
        return self.file.get("album", [ "Unknown Album" ])[0]

    def artist(self):
        artist = self.file.get("artist", [ "Unknown Artist" ])
        return self.file.get("albumartist", artist)[0]

    def artistsort(self):
        sort = self.file.get("artistsort", [ self.artist() ])
        return self.file.get("albumartistsort", sort)[0]

    def decade(self):
        return (self.year() // 10) * 10

    def discnumber(self):
        return int(self.file.get("discnumber", [ 1 ])[0])

    def discsubtitle(self):
        return self.file.get("discsubtitle", [ None ])[0]

    def genres(self):
        genre = self.file.get("genre", [ "" ])[0]
        return [ g.strip() for g in re.split(",|;|/|:", genre) ]

    def length(self):
        return int(self.file.info.length)

    def release(self):
        date = self.file.get("date", [ "0" ])
        date = self.file.get("originalyear", date)[0].split("-")
        year = int(date[0]) if len(date) > 0 else 1
        month = int(date[1]) if len(date) > 1 else 1
        day = int(date[2]) if len(date) > 2 else 1
        return datetime.date(max(year, 1), month, day)

    def title(self):
        return self.file.get("title", [ "" ])[0]

    def tracknumber(self):
        return int(self.file.get("tracknumber", [ 0 ])[0])

    def year(self):
        year = self.file.get("date", [ "0" ])
        year = self.file.get("originalyear", year)[0]
        return int(re.match("\d+", year).group(0))