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<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Block Blast Solver</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <style>
        .grid-cell {
            aspect-ratio: 1 / 1;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: white;
            font-size: 1.2rem;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
        }
        .cell-empty { background-color: #e5e7eb; border: 1px solid #d1d5db; }
        .cell-filled { background-color: #4b5563; border: 1px solid #374151; }
        .cell-preview-1 { background-color: #fbbf24; border: 2px solid #d97706; }
        .cell-preview-2 { background-color: #f59e0b; border: 2px solid #b45309; }
        .cell-preview-3 { background-color: #d97706; border: 2px solid #92400e; }
        
        .piece-editor-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 2px;
            width: 120px;
            background-color: #f3f4f6;
            padding: 4px;
            border-radius: 8px;
        }
        .mini-cell {
            aspect-ratio: 1 / 1;
            border-radius: 2px;
            cursor: pointer;
        }
        .mini-empty { background-color: #ffffff; border: 1px solid #e5e7eb; }
        .mini-filled { background-color: #6366f1; border: 1px solid #4338ca; }
    </style>
</head>
<body class="bg-slate-100 min-h-screen p-4 md:p-8 font-sans">

    <div class="max-w-6xl mx-auto bg-white rounded-2xl shadow-xl overflow-hidden">
        <div class="bg-indigo-600 p-6 text-white text-center">
            <h1 class="text-2xl font-bold italic uppercase tracking-wider">BLOCK BLAST SOLVER</h1>
        </div>

        <div class="p-6 grid grid-cols-1 lg:grid-cols-12 gap-8">
            <div class="lg:col-span-7">
                <h2 class="text-lg font-semibold mb-4 flex items-center">
                    <span class="bg-indigo-100 text-indigo-600 w-6 h-6 rounded-full flex items-center justify-center mr-2 text-sm">1</span>
                    ็พๅœจใฎ็›ค้ขใ‚’ๅ…ฅๅŠ›
                </h2>
                <div id="game-grid" class="grid grid-cols-8 gap-1 bg-gray-300 p-2 rounded-xl shadow-inner border-4 border-gray-400">
                    <!-- JS generates 64 cells -->
                </div>
                <div class="flex justify-between mt-4 items-center">
                    <button id="clear-grid" class="px-4 py-2 bg-white border border-gray-300 rounded-lg text-sm font-medium text-gray-600 hover:bg-gray-50">
                        ็›ค้ขใ‚’ใƒชใ‚ปใƒƒใƒˆ
                    </button>
                </div>
            </div>

            <div class="lg:col-span-5 space-y-4">
                <h2 class="text-lg font-semibold mb-2 flex items-center">
                    <span class="bg-indigo-100 text-indigo-600 w-6 h-6 rounded-full flex items-center justify-center mr-2 text-sm">2</span>
                    ๆŒใก้ง’ใ‚’ๅ…ฅๅŠ›
                </h2>
                
                <div class="grid grid-cols-3 lg:grid-cols-1 gap-4">
                    <div class="bg-slate-50 p-3 rounded-xl border border-slate-200 flex flex-col items-center">
                        <span class="text-[10px] font-bold text-slate-400 mb-1 uppercase">Piece A</span>
                        <div id="piece-editor-0" class="piece-editor-grid"></div>
                        <button onclick="clearPiece(0)" class="mt-1 text-[10px] text-indigo-500">CLEAR</button>
                    </div>
                    <div class="bg-slate-50 p-3 rounded-xl border border-slate-200 flex flex-col items-center">
                        <span class="text-[10px] font-bold text-slate-400 mb-1 uppercase">Piece B</span>
                        <div id="piece-editor-1" class="piece-editor-grid"></div>
                        <button onclick="clearPiece(1)" class="mt-1 text-[10px] text-indigo-500">CLEAR</button>
                    </div>
                    <div class="bg-slate-50 p-3 rounded-xl border border-slate-200 flex flex-col items-center">
                        <span class="text-[10px] font-bold text-slate-400 mb-1 uppercase">Piece C</span>
                        <div id="piece-editor-2" class="piece-editor-grid"></div>
                        <button onclick="clearPiece(2)" class="mt-1 text-[10px] text-indigo-500">CLEAR</button>
                    </div>
                </div>

                <div class="pt-4 border-t space-y-3">
                    <button id="solve-btn" class="w-full bg-indigo-600 hover:bg-indigo-700 text-white font-bold py-4 rounded-2xl shadow-lg transition-all transform active:scale-95 text-lg">
                        ๆœ€้ฉใƒซใƒผใƒˆใ‚’็ฎ—ๅ‡บ
                    </button>
                    
                    <button id="apply-btn" disabled class="w-full bg-emerald-600 hover:bg-emerald-700 disabled:bg-gray-300 disabled:cursor-not-allowed text-white font-bold py-4 rounded-2xl shadow-lg transition-all transform active:scale-95 text-lg">
                        ้…็ฝฎใ‚’็ขบๅฎšใ—ใฆๆฌกใธ
                    </button>

                    <div id="status-message" class="p-4 rounded-xl text-center text-sm font-medium border min-h-[80px] flex items-center justify-center leading-relaxed">
                        ็›ค้ขใจๅฐ‘ใชใใจใ‚‚1ใคใฎ้ง’ใ‚’ๆใ„ใฆใใ ใ•ใ„
                    </div>
                </div>
            </div>
        </div>
    </div>

    <script>
        const GRID_SIZE = 8;
        const MINI_SIZE = 5;
        let grid = Array(GRID_SIZE).fill().map(() => Array(GRID_SIZE).fill(0));
        let piecesRaw = Array(3).fill().map(() => Array(MINI_SIZE).fill().map(() => Array(MINI_SIZE).fill(0)));
        let currentBestSequence = null;

        // --- UI ---
        const gridEl = document.getElementById('game-grid');
        function initBoard() {
            gridEl.innerHTML = '';
            for (let r = 0; r < GRID_SIZE; r++) {
                for (let c = 0; c < GRID_SIZE; c++) {
                    const cell = document.createElement('div');
                    cell.className = `grid-cell rounded cursor-pointer ${grid[r][c] ? 'cell-filled' : 'cell-empty'}`;
                    cell.dataset.r = r; cell.dataset.c = c;
                    cell.onclick = () => { grid[r][c] = grid[r][c] ? 0 : 1; renderBoard(); };
                    gridEl.appendChild(cell);
                }
            }
        }

        function renderBoard(previews = []) {
            const cells = gridEl.children;
            for (let i = 0; i < cells.length; i++) {
                const r = parseInt(cells[i].dataset.r);
                const c = parseInt(cells[i].dataset.c);
                cells[i].className = 'grid-cell rounded cursor-pointer';
                cells[i].innerText = '';
                
                if (grid[r][c]) {
                    cells[i].classList.add('cell-filled');
                } else {
                    let pIdx = previews.findIndex(p => p.coords.some(coord => coord[0] === r && coord[1] === c));
                    if (pIdx !== -1) {
                        cells[i].classList.add(`cell-preview-${pIdx + 1}`);
                        cells[i].innerText = (pIdx + 1);
                    } else {
                        cells[i].classList.add('cell-empty');
                    }
                }
            }
        }

        function initPieceEditors() {
            for (let i = 0; i < 3; i++) {
                const container = document.getElementById(`piece-editor-${i}`);
                container.innerHTML = '';
                for (let r = 0; r < MINI_SIZE; r++) {
                    for (let c = 0; c < MINI_SIZE; c++) {
                        const cell = document.createElement('div');
                        cell.className = `mini-cell ${piecesRaw[i][r][c] ? 'mini-filled' : 'mini-empty'}`;
                        cell.onclick = () => { piecesRaw[i][r][c] = piecesRaw[i][r][c] ? 0 : 1; renderPieceEditor(i); };
                        container.appendChild(cell);
                    }
                }
            }
        }

        function renderPieceEditor(index) {
            const container = document.getElementById(`piece-editor-${index}`);
            const cells = container.children;
            for (let i = 0; i < 25; i++) {
                const r = Math.floor(i / 5); const c = i % 5;
                cells[i].className = `mini-cell ${piecesRaw[index][r][c] ? 'mini-filled' : 'mini-empty'}`;
            }
        }

        function clearPiece(index) {
            piecesRaw[index] = Array(MINI_SIZE).fill().map(() => Array(MINI_SIZE).fill(0));
            renderPieceEditor(index);
        }

        function getPiecePoints(index) {
            const pts = []; let minR = 5, minC = 5;
            for (let r = 0; r < 5; r++) {
                for (let c = 0; c < 5; c++) {
                    if (piecesRaw[index][r][c]) {
                        pts.push([r, c]); minR = Math.min(minR, r); minC = Math.min(minC, c);
                    }
                }
            }
            if (pts.length === 0) return null;
            return pts.map(p => [p[0] - minR, p[1] - minC]);
        }

        function canPlace(board, piece, r, c) {
            for (let [pr, pc] of piece) {
                const nr = r + pr, nc = c + pc;
                if (nr < 0 || nr >= 8 || nc < 0 || nc >= 8 || board[nr][nc]) return false;
            }
            return true;
        }

        function applyPlacement(board, piece, r, c) {
            const newBoard = board.map(row => [...row]);
            piece.forEach(([pr, pc]) => newBoard[r + pr][c + pc] = 1);
            let rows = [], cols = [];
            for (let i = 0; i < 8; i++) {
                if (newBoard[i].every(v => v === 1)) rows.push(i);
                let fullCol = true;
                for(let j=0; j<8; j++) if(newBoard[j][i] === 0) { fullCol = false; break; }
                if (fullCol) cols.push(i);
            }
            rows.forEach(ri => newBoard[ri].fill(0));
            cols.forEach(ci => { for(let i=0; i<8; i++) newBoard[i][ci] = 0; });
            return { board: newBoard, lines: rows.length + cols.length };
        }

        function evaluate(board, linesCleared) {
            let score = 0;
            if (linesCleared > 0) {
                score += linesCleared * 1000;
            } else {
                for (let i = 0; i < 8; i++) {
                    let rCount = 0, cCount = 0;
                    for (let j = 0; j < 8; j++) {
                        if (board[i][j]) rCount++;
                        if (board[j][i]) cCount++;
                    }
                    if (rCount === 7) score += 150;
                    if (cCount === 7) score += 150;
                }
            }
            const giantPiece = [[0,0],[0,1],[0,2],[1,0],[1,1],[1,2],[2,0],[2,1],[2,2]];
            let canFitGiantCenter = false;
            for (let r=1; r<=4; r++) {
                for (let c=1; c<=4; c++) {
                    if (canPlace(board, giantPiece, r, c)) { canFitGiantCenter = true; break; }
                }
                if (canFitGiantCenter) break;
            }
            if (canFitGiantCenter) score += 500; else score -= 2000;
            for (let i=0; i<8; i++) {
                if (board[0][i]) score += 5; if (board[7][i]) score += 5;
                if (board[i][0]) score += 5; if (board[i][7]) score += 5;
            }
            let empty = 0;
            board.forEach(row => row.forEach(v => { if(!v) empty++; }));
            score += empty * 10;
            return score;
        }

        // --- Solver Engine (Supports 1-3 pieces) ---
        async function solve() {
            const status = document.getElementById('status-message');
            const applyBtn = document.getElementById('apply-btn');
            applyBtn.disabled = true;
            currentBestSequence = null;

            const available = [];
            for (let i=0; i<3; i++) {
                const p = getPiecePoints(i);
                if (p) available.push({ id: i, shape: p });
            }

            if (available.length === 0) {
                status.innerText = "ๅฐ‘ใชใใจใ‚‚1ใคใฎ้ง’ใ‚’ๆใ„ใฆใใ ใ•ใ„ใ€‚";
                status.className = "p-4 rounded-xl text-center text-sm font-medium border bg-yellow-50 text-yellow-700 border-yellow-200";
                return;
            }

            status.innerText = "่จˆ็ฎ—ไธญ...";
            await new Promise(r => setTimeout(r, 50));

            let maxTotalScore = -Infinity;

            // Generate all permutations of indices 0..n-1
            function getPermutations(arr) {
                if (arr.length <= 1) return [arr];
                let perms = [];
                for (let i = 0; i < arr.length; i++) {
                    let rest = getPermutations(arr.slice(0, i).concat(arr.slice(i + 1)));
                    for (let r of rest) perms.push([arr[i]].concat(r));
                }
                return perms;
            }

            const perms = getPermutations(available.map((_, i) => i));

            // Recursive simulation for n pieces
            function simulate(currentBoard, availableIdxs, currentPath, currentScore) {
                if (availableIdxs.length === 0) {
                    if (currentScore > maxTotalScore) {
                        maxTotalScore = currentScore;
                        currentBestSequence = [...currentPath];
                    }
                    return;
                }

                const piece = available[availableIdxs[0]];
                const nextIdxs = availableIdxs.slice(1);

                for (let r = 0; r < 8; r++) {
                    for (let c = 0; c < 8; c++) {
                        if (canPlace(currentBoard, piece.shape, r, c)) {
                            const result = applyPlacement(currentBoard, piece.shape, r, c);
                            const stepScore = evaluate(result.board, result.lines);
                            
                            currentPath.push({
                                shape: piece.shape,
                                r: r, c: c,
                                coords: piece.shape.map(pt => [r + pt[0], c + pt[1]])
                            });
                            
                            simulate(result.board, nextIdxs, currentPath, currentScore + stepScore);
                            
                            currentPath.pop();
                        }
                    }
                }
            }

            for (let p of perms) {
                simulate(grid, p, [], 0);
            }

            if (currentBestSequence) {
                renderBoard(currentBestSequence);
                applyBtn.disabled = false;
                status.innerHTML = `<b>ๆœ€้ฉใƒซใƒผใƒˆ(${currentBestSequence.length}ๆ‰‹)ใ‚’็ฎ—ๅ‡บ๏ผ</b><br>็ขบๅฎšใƒœใ‚ฟใƒณใง็›ค้ขใ‚’ๆ›ดๆ–ฐใ—ใพใ™ใ€‚`;
                status.className = "p-4 rounded-xl text-center text-sm font-medium border bg-green-50 text-green-700 border-green-200";
            } else {
                status.innerText = "ๆŒ‡ๅฎšใ•ใ‚ŒใŸ้ง’ใ‚’ใ™ในใฆ็ฝฎใ‘ใ‚‹ใƒซใƒผใƒˆใŒ่ฆ‹ใคใ‹ใ‚Šใพใ›ใ‚“ใงใ—ใŸใ€‚";
                status.className = "p-4 rounded-xl text-center text-sm font-medium border bg-red-50 text-red-700 border-red-200";
            }
        }

        function applyBestSequence() {
            if (!currentBestSequence) return;
            let tempBoard = grid;
            for (const step of currentBestSequence) {
                const res = applyPlacement(tempBoard, step.shape, step.r, step.c);
                tempBoard = res.board;
            }
            grid = tempBoard;
            currentBestSequence = null;
            renderBoard();
            for (let i=0; i<3; i++) clearPiece(i);
            document.getElementById('apply-btn').disabled = true;
            document.getElementById('status-message').innerText = "้…็ฝฎใ‚’้ฉ็”จใ—ใพใ—ใŸใ€‚";
            document.getElementById('status-message').className = "p-4 rounded-xl text-center text-sm font-medium border bg-indigo-50 text-indigo-700 border-indigo-200";
        }

        document.getElementById('solve-btn').onclick = solve;
        document.getElementById('apply-btn').onclick = applyBestSequence;
        document.getElementById('clear-grid').onclick = () => {
            grid = Array(GRID_SIZE).fill().map(() => Array(GRID_SIZE).fill(0));
            currentBestSequence = null;
            document.getElementById('apply-btn').disabled = true;
            renderBoard();
            document.getElementById('status-message').innerText = "็›ค้ขใ‚’ใƒชใ‚ปใƒƒใƒˆใ—ใพใ—ใŸ";
        };

        initBoard();
        initPieceEditors();
    </script>
</body>
</html>