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<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Jeu d'Échecs Flask</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <style>
        /* Pour centrer le SVG et éviter qu'il ne soit trop large sur mobile */
        .board-container svg {
            display: block;
            margin: 0 auto;
            max-width: 100%;
            height: auto;
        }
        /* Simple highlight pour la dernière case jouée par l'IA */
        .highlight-last-move rect.lastmove {
            fill: rgba(255, 255, 0, 0.4) !important; /* Jaune semi-transparent */
        }
    </style>
</head>
<body class="bg-gray-900 text-gray-100 min-h-screen flex flex-col items-center p-4">

    <div class="container mx-auto max-w-4xl">
        <h1 class="text-4xl font-bold text-center my-6 text-teal-400">Jeu d'Échecs</h1>

        <div class="bg-gray-800 p-6 rounded-lg shadow-xl mb-6">
            <h2 class="text-2xl font-semibold mb-3 text-sky-400">Configuration</h2>
            <div class="flex flex-wrap gap-4 items-center">
                <button id="setPvP" class="bg-blue-600 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded focus:outline-none focus:shadow-outline">
                    Humain vs Humain
                </button>
                <div>
                    <button id="setPvAIWhite" class="bg-green-600 hover:bg-green-700 text-white font-bold py-2 px-4 rounded focus:outline-none focus:shadow-outline">
                        Jouer vs IA (Blancs)
                    </button>
                    <button id="setPvAIBlack" class="bg-purple-600 hover:bg-purple-700 text-white font-bold py-2 px-4 rounded focus:outline-none focus:shadow-outline mt-2 sm:mt-0 sm:ml-2">
                        Jouer vs IA (Noirs)
                    </button>
                </div>
                <button id="resetGame" class="bg-red-600 hover:bg-red-700 text-white font-bold py-2 px-4 rounded focus:outline-none focus:shadow-outline">
                    Nouvelle Partie (Reset)
                </button>
            </div>
            <p class="mt-3 text-sm text-gray-400">Mode Actuel: <span id="currentMode" class="font-semibold">{{ game_mode.upper() }}</span></p>
            <p id="playerColorInfo" class="mt-1 text-sm text-gray-400 {% if game_mode != 'ai' %}hidden{% endif %}">
                Vous jouez avec les: <span id="currentPlayerColor" class="font-semibold">{{ player_color.capitalize() if player_color else 'N/A' }}</span>
            </p>
        </div>

        <div class="grid md:grid-cols-3 gap-6">
            <div class="md:col-span-2 bg-gray-800 p-2 sm:p-6 rounded-lg shadow-xl board-container">
                <div id="boardDisplay" class="highlight-last-move">
                    {{ initial_board_svg|safe }}
                </div>
            </div>

            <div class="bg-gray-800 p-6 rounded-lg shadow-xl">
                <h3 class="text-xl font-semibold mb-3 text-sky-400">Informations</h3>
                <p id="turnDisplay" class="mb-2">Tour des: <span class="font-bold">Blancs</span></p>
                <p id="status" class="text-yellow-400 font-semibold mb-4 h-6"></p>
                
                <form id="moveForm" class="space-y-3">
                    <div>
                        <label for="moveInput" class="block text-sm font-medium text-gray-300">Votre coup (ex: e2e4, Nf3):</label>
                        <input type="text" id="moveInput" name="move"
                               class="mt-1 block w-full bg-gray-700 border border-gray-600 rounded-md shadow-sm py-2 px-3 focus:outline-none focus:ring-sky-500 focus:border-sky-500 sm:text-sm text-white"
                               placeholder="e.g., e2e4">
                    </div>
                    <button type="submit"
                            class="w-full bg-teal-600 hover:bg-teal-700 text-white font-bold py-2 px-4 rounded focus:outline-none focus:shadow-outline transition duration-150 ease-in-out">
                        Jouer
                    </button>
                </form>

                <div id="outcomeDisplay" class="mt-4 text-lg font-bold text-center">
                    {% if is_game_over %}
                        <p class="text-green-400">{{ outcome }}</p>
                    {% endif %}
                </div>
                 <div class="mt-4">
                    <p class="text-sm text-gray-400">Dernier coup IA:</p>
                    <p id="lastAIMove" class="text-gray-200 font-mono">-</p>
                </div>
            </div>
        </div>
    </div>

    <script>
        const boardDisplay = document.getElementById('boardDisplay');
        const moveForm = document.getElementById('moveForm');
        const moveInput = document.getElementById('moveInput');
        const statusDisplay = document.getElementById('status');
        const turnDisplay = document.getElementById('turnDisplay').querySelector('span');
        const outcomeDisplay = document.getElementById('outcomeDisplay');
        const lastAIMoveDisplay = document.getElementById('lastAIMove');
        
        const currentModeDisplay = document.getElementById('currentMode');
        const playerColorInfoDisplay = document.getElementById('playerColorInfo');
        const currentPlayerColorDisplay = document.getElementById('currentPlayerColor');

        let currentFEN = "{{ initial_fen }}";
        let gameMode = "{{ game_mode }}";
        let playerColor = "{{ player_color if player_color else 'white' }}"; // Couleur du joueur humain en mode AI
        let isPlayerTurn = true; // Utilisé en mode AI

        function updateBoard(data) {
            if (data.board_svg) {
                boardDisplay.innerHTML = data.board_svg;
            }
            currentFEN = data.fen;
            
            if (data.turn) {
                turnDisplay.textContent = data.turn === 'white' ? 'Blancs' : 'Noirs';
            } else {
                // Déduire du FEN si non fourni explicitement
                const fenTurn = data.fen.split(' ')[1];
                turnDisplay.textContent = fenTurn === 'w' ? 'Blancs' : 'Noirs';
            }

            if (data.ai_move_uci) {
                lastAIMoveDisplay.textContent = data.ai_move_uci;
            } else if (!data.game_over) {
                 // Ne pas effacer si la partie est finie et que le dernier coup était humain
                 // lastAIMoveDisplay.textContent = "-";
            }


            if (data.game_over) {
                statusDisplay.textContent = "Partie terminée!";
                outcomeDisplay.innerHTML = `<p class="text-green-400">${data.outcome}</p>`;
                moveInput.disabled = true;
                moveForm.querySelector('button[type="submit"]').disabled = true;
            } else {
                statusDisplay.textContent = '';
                outcomeDisplay.innerHTML = '';
                moveInput.disabled = false;
                moveForm.querySelector('button[type="submit"]').disabled = false;
            }
            
            // Gérer le tour du joueur en mode AI
            updatePlayerTurnState();
        }

        function updatePlayerTurnState() {
            const fenTurn = currentFEN.split(' ')[1]; // 'w' or 'b'
            if (gameMode === 'ai') {
                const aiIsWhite = (playerColor === 'black');
                const aiIsBlack = (playerColor === 'white');

                if ((aiIsWhite && fenTurn === 'w') || (aiIsBlack && fenTurn === 'b')) {
                    isPlayerTurn = false;
                    moveInput.disabled = true;
                    moveForm.querySelector('button[type="submit"]').disabled = true;
                    statusDisplay.textContent = "L'IA réfléchit...";
                } else {
                    isPlayerTurn = true;
                    if (!currentFEN.split(' ')[0].includes('k') || !currentFEN.split(' ')[0].includes('K')) { // Check si la partie est terminée
                        moveInput.disabled = false;
                        moveForm.querySelector('button[type="submit"]').disabled = false;
                    }
                    statusDisplay.textContent = "À vous de jouer.";
                }
            } else { // PvP mode
                isPlayerTurn = true; // Toujours au tour du joueur en PvP
                moveInput.disabled = false;
                moveForm.querySelector('button[type="submit"]').disabled = false;
            }
        }


        moveForm.addEventListener('submit', async (e) => {
            e.preventDefault();
            const move = moveInput.value.trim();
            if (!move) return;

            statusDisplay.textContent = 'Traitement...';
            lastAIMoveDisplay.textContent = "-"; // Clear last AI move when player submits

            try {
                const response = await fetch('/make_move', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ move: move })
                });
                const data = await response.json();

                if (data.error) {
                    statusDisplay.textContent = `Erreur: ${data.error}`;
                } else {
                    updateBoard(data);
                    moveInput.value = ''; // Clear input on successful move
                }
            } catch (error) {
                console.error("Erreur lors de la communication:", error);
                statusDisplay.textContent = "Erreur de communication avec le serveur.";
            }
        });

        document.getElementById('resetGame').addEventListener('click', async () => {
            statusDisplay.textContent = 'Réinitialisation...';
            try {
                const response = await fetch('/reset_game', { method: 'POST' });
                const data = await response.json();
                updateBoard(data); // data contient fen et board_svg
                lastAIMoveDisplay.textContent = "-";
                 // Réinitialiser l'état du jeu pour une nouvelle partie
                moveInput.disabled = false;
                moveForm.querySelector('button[type="submit"]').disabled = false;
                outcomeDisplay.innerHTML = ''; // Effacer le message de fin de partie
                 // Mettre à jour l'affichage du mode et de la couleur
                currentModeDisplay.textContent = data.game_mode ? data.game_mode.toUpperCase() : 'PVP';
                if (data.game_mode === 'ai' && data.player_color) {
                    currentPlayerColorDisplay.textContent = data.player_color.charAt(0).toUpperCase() + data.player_color.slice(1);
                    playerColorInfoDisplay.classList.remove('hidden');
                } else {
                    playerColorInfoDisplay.classList.add('hidden');
                }
                 // Mettre à jour l'état du tour
                updatePlayerTurnState();

            } catch (error) {
                console.error("Erreur lors de la réinitialisation:", error);
                statusDisplay.textContent = "Erreur lors de la réinitialisation.";
            }
        });

        async function setGameMode(mode, pColor = 'white') {
            statusDisplay.textContent = `Changement de mode vers ${mode.toUpperCase()}...`;
            lastAIMoveDisplay.textContent = "-";
            try {
                const response = await fetch('/set_mode', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ game_mode: mode, player_color: pColor })
                });
                const data = await response.json();
                if (data.error) {
                    statusDisplay.textContent = `Erreur: ${data.error}`;
                } else {
                    gameMode = data.game_mode;
                    playerColor = data.player_color;
                    updateBoard(data); // data contient fen, board_svg, etc.
                    currentModeDisplay.textContent = gameMode.toUpperCase();
                    if (gameMode === 'ai') {
                        currentPlayerColorDisplay.textContent = playerColor.charAt(0).toUpperCase() + playerColor.slice(1);
                        playerColorInfoDisplay.classList.remove('hidden');
                    } else {
                        playerColorInfoDisplay.classList.add('hidden');
                    }
                    statusDisplay.textContent = data.message;
                    if (data.initial_ai_move_uci) {
                        lastAIMoveDisplay.textContent = data.initial_ai_move_uci;
                    }
                }
            } catch (error) {
                console.error("Erreur de changement de mode:", error);
                statusDisplay.textContent = "Erreur de changement de mode.";
            }
        }

        document.getElementById('setPvP').addEventListener('click', () => setGameMode('pvp'));
        document.getElementById('setPvAIWhite').addEventListener('click', () => setGameMode('ai', 'white'));
        document.getElementById('setPvAIBlack').addEventListener('click', () => setGameMode('ai', 'black'));

        // Initialiser l'état du tour au chargement de la page
        updatePlayerTurnState();
        // Afficher la couleur du joueur si en mode AI au chargement
        if (gameMode === 'ai') {
            currentPlayerColorDisplay.textContent = playerColor.charAt(0).toUpperCase() + playerColor.slice(1);
            playerColorInfoDisplay.classList.remove('hidden');
        }

    </script>
</body>
</html>