app.py

import os
import random
import uvicorn
from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse
from pydantic import BaseModel
from typing import List, Optional

app = FastAPI()

class GameState(BaseModel):
    board: List[List[int]]
    hand: List[Optional[List[List[int]]]]

def rotate_cw(piece):
    return [[piece[1][0], piece[0][0]], 
            [piece[1][1], piece[0][1]]]

def can_place(board, piece, r, c):
    for ir in range(2):
        for ic in range(2):
            br, bc = r + ir, c + ic
            if br < 0 or br >= 8 or bc < 0 or bc >= 8:
                return False
            if board[br][bc] >= 0:
                return False
    return True

def get_connected_empty_spaces(board):
    visited = [[False]*8 for _ in range(8)]
    small_holes = 0
    for r in range(8):
        for c in range(8):
            if board[r][c] == -1 and not visited[r][c]:
                q = [(r, c)]
                visited[r][c] = True
                size = 1
                while q:
                    cr, cc = q.pop(0)
                    for dr, dc in [(-1, 0), (1, 0), (0, -1), (0, 1)]:
                        nr, nc = cr + dr, cc + dc
                        if 0 <= nr < 8 and 0 <= nc < 8 and board[nr][nc] == -1 and not visited[nr][nc]:
                            visited[nr][nc] = True
                            q.append((nr, nc))
                            size += 1
                # 1〜2マスの孤立した空間は、ブロックが置けなくなる原因になるためカウント
                if size <= 2:
                    small_holes += 1
    return small_holes

def get_color_adjacency(board):
    adj = 0
    for r in range(8):
        for c in range(8):
            color = board[r][c]
            if 0 <= color <= 3:
                for dr, dc in [(1, 0), (0, 1)]:
                    nr, nc = r + dr, c + dc
                    if nr < 8 and nc < 8 and board[nr][nc] == color:
                        adj += 1
    return adj

def simulate_move(board, piece, r, c):
    temp_board = [row[:] for row in board]
    for ir in range(2):
        for ic in range(2):
            temp_board[r + ir][c + ic] = piece[ir][ic]
            
    score = 0
    combo = 0
    
    # 連鎖シミュレーション
    while True:
        visited = [[False]*8 for _ in range(8)]
        to_remove = set()
        
        for br in range(8):
            for bc in range(8):
                color = temp_board[br][bc]
                if 0 <= color <= 3 and not visited[br][bc]:
                    q = [(br, bc)]
                    visited[br][bc] = True
                    group = [(br, bc)]
                    while q:
                        cr, cc = q.pop(0)
                        for dr, dc in [(-1, 0), (1, 0), (0, -1), (0, 1)]:
                            nr, nc = cr + dr, cc + dc
                            if 0 <= nr < 8 and 0 <= nc < 8 and not visited[nr][nc] and temp_board[nr][nc] == color:
                                visited[nr][nc] = True
                                q.append((nr, nc))
                                group.append((nr, nc))
                    if len(group) >= 3:
                        for gr, gc in group:
                            to_remove.add((gr, gc))
                            
        if not to_remove:
            break
            
        combo += 1
        garbage = set()
        for rr, cc in to_remove:
            for dr, dc in [(-1, 0), (1, 0), (0, -1), (0, 1)]:
                nr, nc = rr + dr, cc + dc
                if 0 <= nr < 8 and 0 <= nc < 8 and temp_board[nr][nc] == 4:
                    garbage.add((nr, nc))
        to_remove.update(garbage)
        
        score += len(to_remove) * 10 * combo
        
        for rr, cc in to_remove:
            temp_board[rr][cc] = -1

    # 盤面評価（AIの賢さの要）
    max_height = 0
    for bc in range(8):
        for br in range(8):
            if temp_board[br][bc] != -1:
                max_height = max(max_height, 8 - br)
                break
                
    small_holes = get_connected_empty_spaces(temp_board)
    adjacency = get_color_adjacency(temp_board)

    # 評価値の計算
    eval_score = score * 100               # スコアは最優先
    eval_score -= (max_height ** 2) * 5    # 高く積むことに対するペナルティ（指数関数的）
    eval_score -= small_holes * 30         # 孤立マスに対するペナルティ
    eval_score += adjacency * 3            # 同色ブロックが隣接していることへのボーナス

    return eval_score + random.random() * 0.1 # 同点時の微小なランダム性

@app.post("/api/ai_move")
def ai_move(state: GameState):
    board = state.board
    hand = state.hand
    
    best_score = -float('inf')
    best_move = None
    
    for p_idx, original_piece in enumerate(hand):
        if original_piece is None:
            continue
        piece = original_piece
        for rot in range(4):
            for r in range(7):
                for c in range(7):
                    if can_place(board, piece, r, c):
                        score = simulate_move(board, piece, r, c)
                        if score > best_score:
                            best_score = score
                            best_move = {"piece_idx": p_idx, "rotations": rot, "r": r, "c": c}
            piece = rotate_cw(piece)
            
    if best_move is None:
        best_move = {"piece_idx": 0, "rotations": 0, "r": 0, "c": 0}
        
    return best_move

app.mount("/static", StaticFiles(directory="static"), name="static")

@app.get("/")
def serve_index():
    return FileResponse("static/index.html")

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=7860)