"""Player models."""

from dataclasses import dataclass, field
from datetime import datetime
from enum import Enum


class PlayerType(Enum):
    HUMAN = "human"
    AI = "ai"
    GUEST = "guest"


@dataclass
class Player:
    """Represents a player."""

    id: str
    username: str
    player_type: PlayerType = PlayerType.HUMAN
    elo: int = 1200
    games_played: int = 0
    wins: int = 0
    losses: int = 0
    draws: int = 0
    created_at: datetime = field(default_factory=datetime.utcnow)
    last_seen: datetime | None = None

    @property
    def winrate(self) -> float:
        """Calculate win rate percentage."""
        if self.games_played == 0:
            return 0.0
        return (self.wins / self.games_played) * 100

    def update_elo(self, opponent_elo: int, result: float, k: int = 32) -> int:
        """
        Update ELO rating based on game result.
        result: 1.0 for win, 0.5 for draw, 0.0 for loss
        Returns the ELO change.
        """
        expected = 1 / (1 + 10 ** ((opponent_elo - self.elo) / 400))
        change = int(k * (result - expected))
        self.elo += change
        return change

    def record_game(self, won: bool, draw: bool = False) -> None:
        """Record a completed game."""
        self.games_played += 1
        if draw:
            self.draws += 1
        elif won:
            self.wins += 1
        else:
            self.losses += 1
        self.last_seen = datetime.utcnow()


@dataclass
class AIPlayer(Player):
    """AI player with configurable difficulty."""

    difficulty: int = 10  # Stockfish skill level 0-20
    think_time_ms: int = 1000  # Time to think per move

    def __post_init__(self):
        self.player_type = PlayerType.AI