import math

from pathlib import Path
from mutagen.mp3 import MP3
from mutagen.flac import FLAC
from datetime import datetime
from dateutil.parser import parse as dateparse


class Track:
    def __init__(
        self,
        file: Path,
        bitrate: int = None,
        file_size: int = None,
        creation_date: int = None,
        modification_date: int = None,
        length: int = None,
        title: str = None,
        artists: list[str] = None,
        album: str = None,
        genre: str = None,
        bpm: int = None,
        release_date: datetime = None,
        label: str = None,
        cover: bytes = None,
        filetype: str = None,
        explicit: bool = False,
        engine_id: int = None,
    ):
        self.file = file
        self.bitrate = bitrate
        self.file_size = file_size
        self.creation_date = creation_date
        self.modification_date = modification_date
        self.length = length
        self.title = title
        self.artists = artists
        self.album = album
        self.genre = genre
        self.bpm = bpm
        self.release_date = release_date
        self.label = label
        self.cover = cover
        self.filetype = filetype
        self.explicit = explicit
        self.engine_id = engine_id

    def fill_empty(self):

        if self.title is None:
            self.title = ""

        if self.artists is None:
            self.artists = [""]

        if self.album is None:
            self.album = ""

        if self.genre is None:
            self.genre = ""

        if self.release_date is None:
            self.release_date = datetime.now()

        if self.label is None:
            self.label = ""

        if self.explicit is None:
            self.explicit = False

    def load_from_metadata(self):
        """
        Try to fill up non-defined fields from file metadata.
        """
        if self.file.suffix == ".flac":
            self.load_from_metadata_flac()

    def load_from_metadata_flac(self):
        """
        Try to fill up non-defined fields from file metadata.
        Loads the fields from a FLAC file.
        """

        tags = FLAC(self.file)

        if self.bitrate is None:
            self.bitrate = int(tags.info.bitrate / 1000)

        if self.file_size is None:
            self.file_size = self.file.stat().st_size

        if self.creation_date is None:
            self.creation_date = int(self.file.stat().st_ctime)

        if self.modification_date is None:
            self.modification_date = int(self.file.stat().st_mtime)

        if self.length is None:
            self.length = int(math.ceil(tags.info.length))

        if self.title is None:
            try:
                self.title = tags["title"][0]
            except KeyError:
                pass

        if self.artists is None:
            try:
                self.artists = tags["artist"]
            except KeyError:
                pass

        if self.album is None:
            try:
                self.album = tags["album"][0]
            except KeyError:
                pass

        if self.genre is None:
            try:
                self.genre = tags["genre"][0]
            except KeyError:
                pass

        if self.bpm is None:
            try:
                self.bpm = int(tags["bpm"][0])
            except KeyError:
                pass

        if self.release_date is None:
            try:
                self.release_date = dateparse(tags["date"][0])
            except KeyError:
                pass

        if self.label is None:
            try:
                self.label = tags["publisher"][0]
            except KeyError:
                pass

        if self.cover is None:
            pictures = tags.pictures

            if pictures is not None and len(pictures) > 0:
                self.cover = tags.pictures[0].data

        if self.explicit is None:
            try:
                self.explicit = bool(tags["itunesadvisory"])
            except KeyError:
                self.explicit = False

    def __str__(self) -> str:
        st = (
            "'"
            + self.title
            + "' by "
            + ", ".join(self.artists)
            + " in album '"
            + self.album
            + "', released "
            + str(self.release_date.date())
        )

        if self.label is not None:
            st += " by " + self.label + ". "
        else:
            st += ". "

        st += "Song is "

        if self.bpm is not None:
            st += "at " + str(self.bpm) + " BPM, "

        st += "Explicit " + str(self.explicit)

        if self.genre is not None:
            st += ", Genre " + self.genre

        st += (
            ", Runtime "
            + str(self.length)
            + ", Bitrate "
            + str(self.bitrate)
            + ", File size "
            + str(self.file_size)
            + ", Created "
            + str(self.creation_date)
            + ", Last modified "
            + str(self.modification_date)
        )

        if self.engine_id is not None:
            st += ", Engine ID " + str(self.engine_id)

        if self.cover is None:
            st += ", No cover."
        else:
            st += ", Cover attached."

        return st