"""Chess game - full chess implementation.

This is a basic stub. Full version would include:
- All chess pieces and movement rules
- Castling, en passant, promotion
- Check and checkmate detection
- Chess engine (minimax or neural network)
"""

from __future__ import annotations

from typing import List, Optional

from common.game_engine import GameEngine, GameState


class ChessGame(GameEngine[tuple, str]):
    def __init__(self) -> None:
        # 8x8 board, pieces represented as strings
        self._board = [["" for _ in range(8)] for _ in range(8)]
        self._setup_board()
        self._current_player = "white"
        self._state = GameState.IN_PROGRESS

    def _setup_board(self) -> None:
        # Simplified setup - just pawns for now
        for i in range(8):
            self._board[1][i] = "wp"  # white pawn
            self._board[6][i] = "bp"  # black pawn
        # Add other pieces in full implementation

    def reset(self) -> None:
        self._board = [["" for _ in range(8)] for _ in range(8)]
        self._setup_board()
        self._current_player = "white"
        self._state = GameState.IN_PROGRESS

    def is_game_over(self) -> bool:
        return self._state == GameState.FINISHED

    def get_current_player(self) -> str:
        return self._current_player

    def get_valid_moves(self) -> List[tuple]:
        # Would return all legal moves in full implementation
        moves = []
        for r in range(8):
            for c in range(8):
                if self._board[r][c].startswith(self._current_player[0]):
                    # Simplified - just allow forward pawn moves
                    if "p" in self._board[r][c]:
                        dr = -1 if self._current_player == "white" else 1
                        if 0 <= r + dr < 8 and self._board[r + dr][c] == "":
                            moves.append(((r, c), (r + dr, c)))
        return moves

    def make_move(self, move: tuple) -> bool:
        from_pos, to_pos = move
        fr, fc = from_pos
        tr, tc = to_pos

        piece = self._board[fr][fc]
        if not piece or not piece.startswith(self._current_player[0]):
            return False

        self._board[tr][tc] = piece
        self._board[fr][fc] = ""

        self._current_player = "black" if self._current_player == "white" else "white"
        return True

    def get_winner(self) -> Optional[str]:
        return None  # Would check for checkmate

    def get_game_state(self) -> GameState:
        return self._state

    def get_state_representation(self) -> dict:
        return {"board": [row.copy() for row in self._board]}


class ChessCLI:
    def __init__(self) -> None:
        self.game = ChessGame()

    def run(self) -> None:
        print("Chess - Basic Implementation")
        print("Full implementation coming soon!")
        print("This version has simplified pawn movement only.")
        print("A complete chess engine would include:")
        print("- All pieces with proper movement")
        print("- Castling, en passant, promotion")
        print("- Check and checkmate detection")
        print("- AI opponent with minimax/neural network")
