from __future__ import annotations

from dataclasses import dataclass
from datetime import date


MIN_COMPETITION_HISTORY = 40


@dataclass(frozen=True)
class CompetitionSpec:
    sport_key: str
    football_data_code: str
    label: str
    calendar_season: bool = False


COMPETITIONS: dict[str, CompetitionSpec] = {
    "soccer_epl": CompetitionSpec("soccer_epl", "PL", "Premier League"),
    "soccer_efl_champ": CompetitionSpec("soccer_efl_champ", "ELC", "EFL Championship"),
    "soccer_germany_bundesliga": CompetitionSpec("soccer_germany_bundesliga", "BL1", "Bundesliga"),
    "soccer_italy_serie_a": CompetitionSpec("soccer_italy_serie_a", "SA", "Serie A"),
    "soccer_spain_la_liga": CompetitionSpec("soccer_spain_la_liga", "PD", "La Liga"),
    "soccer_france_ligue_one": CompetitionSpec("soccer_france_ligue_one", "FL1", "Ligue 1"),
    "soccer_brazil_campeonato": CompetitionSpec("soccer_brazil_campeonato", "BSA", "Brasileirão Série A", True),
    "soccer_netherlands_eredivisie": CompetitionSpec("soccer_netherlands_eredivisie", "DED", "Eredivisie"),
    "soccer_portugal_primeira_liga": CompetitionSpec("soccer_portugal_primeira_liga", "PPL", "Primeira Liga"),
    "soccer_uefa_champs_league": CompetitionSpec("soccer_uefa_champs_league", "CL", "UEFA Champions League"),
}


def competition_for_sport_key(sport_key: str) -> CompetitionSpec | None:
    return COMPETITIONS.get(sport_key)


def season_start_year(spec: CompetitionSpec, today: date) -> int:
    if spec.calendar_season:
        return today.year
    # Top European competitions represented here start in the second half
    # of the calendar year. June also covers early UEFA qualification.
    return today.year if today.month >= 6 else today.year - 1


def requested_competitions(sport_keys: tuple[str, ...]) -> tuple[CompetitionSpec, ...]:
    seen: set[str] = set()
    out: list[CompetitionSpec] = []
    for key in sport_keys:
        spec = competition_for_sport_key(key)
        if spec and spec.football_data_code not in seen:
            seen.add(spec.football_data_code)
            out.append(spec)
    return tuple(out)