# Standard library imports
from __future__ import annotations

from dataclasses import dataclass, field
from enum import auto, Enum
import functools
from typing import NamedTuple

# Third party imports

# PyQt imports
from PyQt6.QtCore import (
    pyqtSignal,
    QObject,
)

# App imports


class Col(Enum):
    START_GAP = 0
    TITLE = auto()
    ARTIST = auto()
    INTRO = auto()
    DURATION = auto()
    START_TIME = auto()
    END_TIME = auto()
    LAST_PLAYED = auto()
    BITRATE = auto()
    NOTE = auto()


def singleton(cls):
    """
    Make a class a Singleton class (see
    https://realpython.com/primer-on-python-decorators/#creating-singletons)
    """

    @functools.wraps(cls)
    def wrapper_singleton(*args, **kwargs):
        if not wrapper_singleton.instance:
            wrapper_singleton.instance = cls(*args, **kwargs)
        return wrapper_singleton.instance

    wrapper_singleton.instance = None
    return wrapper_singleton


class FileErrors(NamedTuple):
    path: str
    error: str


class ApplicationError(Exception):
    """
    Custom exception
    """

    pass


class AudioMetadata(NamedTuple):
    start_gap: int = 0
    silence_at: int = 0
    fade_at: int = 0


@singleton
@dataclass
class MusicMusterSignals(QObject):
    """
    Class for all MusicMuster signals. See:
     - https://zetcode.com/gui/pyqt5/eventssignals/
     - https://stackoverflow.com/questions/62654525/
        emit-a-signal-from-another-class-to-main-class
    and Singleton class at
    https://refactoring.guru/design-patterns/singleton/python/example#example-0
    """

    begin_reset_model_signal = pyqtSignal(int)
    enable_escape_signal = pyqtSignal(bool)
    end_reset_model_signal = pyqtSignal(int)
    next_track_changed_signal = pyqtSignal()
    resize_rows_signal = pyqtSignal(int)
    search_songfacts_signal = pyqtSignal(str)
    search_wikipedia_signal = pyqtSignal(str)
    show_warning_signal = pyqtSignal(str, str)
    span_cells_signal = pyqtSignal(int, int, int, int, int)
    status_message_signal = pyqtSignal(str, int)
    track_ended_signal = pyqtSignal()

    def __post_init__(self):
        super().__init__()


class Tags(NamedTuple):
    artist: str = ""
    title: str = ""
    bitrate: int = 0
    duration: int = 0


class TrackInfo(NamedTuple):
    track_id: int
    row_number: int