const API_BASE_URL = window.location.origin + '/api';
let currentUser = null;
let currentMatch = null;

// Fonction API
async function apiCall(endpoint, method = 'GET', data = null) {
    const options = {
        method: method,
        headers: {
            'Content-Type': 'application/json'
        }
    };
    
    const token = localStorage.getItem('authToken');
    if (token) {
        options.headers['Authorization'] = `Bearer ${token}`;
    }
    
    if (data && (method === 'POST' || method === 'PUT')) {
        options.body = JSON.stringify(data);
    }
    
    try {
        const response = await fetch(`${API_BASE_URL}/${endpoint}`, options);
        const result = await response.json();
        
        if (!response.ok) {
            throw new Error(result.error || 'Erreur serveur');
        }
        
        return result;
    } catch (error) {
        console.error('API Error:', error);
        throw error;
    }
}

// Vérification de la session au chargement
window.onload = async function() {
    const token = localStorage.getItem('authToken');
    if (!token) {
        window.location.href = 'index.html';
        return;
    }
    
    try {
        const result = await apiCall('auth.php?action=me');
        currentUser = result.user;
        document.getElementById('userName').textContent = currentUser.username;
        document.getElementById('userPoints').textContent = `${currentUser.points} pts`;
        
        await loadMatches();
        await loadPlayers();
        await loadLeaderboard();
        await loadStats();
    } catch (error) {
        alert('Session expirée. Veuillez vous reconnecter.');
        localStorage.removeItem('authToken');
        localStorage.removeItem('currentUser');
        window.location.href = 'index.html';
    }
};

function logout() {
    localStorage.removeItem('authToken');
    localStorage.removeItem('currentUser');
    window.location.href = 'index.html';
}

function showSection(sectionId) {
    document.querySelectorAll('.section').forEach(s => s.classList.remove('active'));
    document.querySelectorAll('.sidebar li').forEach(l => l.classList.remove('active'));
    document.getElementById(sectionId).classList.add('active');
    event.target.classList.add('active');
}

// Chargement des matches depuis la BDD
async function loadMatches() {
    try {
        const result = await apiCall('matches.php');
        const container = document.getElementById('matchesList');
        container.innerHTML = '';
        
        result.matches.forEach(match => {
            const matchCard = document.createElement('div');
            matchCard.className = 'match-card';
            matchCard.onclick = () => openPredictionModal(match);
            
            matchCard.innerHTML = `
                <div class="player-info">
                    <img src="${match.player1.photo}" alt="${match.player1.name}" class="player-photo" onerror="this.src='https://via.placeholder.com/60?text=${encodeURIComponent(match.player1.name.charAt(0))}'">
                    <div class="player-details">
                        <h3>${match.player1.name}</h3>
                        <p>${match.player1.nationality} - ${match.player1.handedness}</p>
                        <p>Ranking: #${match.player1.ranking}</p>
                    </div>
                </div>
                <div class="vs">VS</div>
                <div class="player-info" style="flex-direction: row-reverse; text-align: right;">
                    <img src="${match.player2.photo}" alt="${match.player2.name}" class="player-photo" onerror="this.src='https://via.placeholder.com/60?text=${encodeURIComponent(match.player2.name.charAt(0))}'">
                    <div class="player-details">
                        <h3>${match.player2.name}</h3>
                        <p>${match.player2.nationality} - ${match.player2.handedness}</p>
                        <p>Ranking: #${match.player2.ranking}</p>
                    </div>
                </div>
                <div class="match-info">
                    <span class="round">${match.round}</span>
                    <p class="date">${new Date(match.date).toLocaleDateString('fr-FR')}</p>
                    <p>${match.court}</p>
                    ${match.status === 'completed' ? `<p class="score">${match.score}</p>` : ''}
                </div>
            `;
            
            container.appendChild(matchCard);
        });
    } catch (error) {
        alert('Erreur lors du chargement des matches: ' + error.message);
    }
}

// Chargement des joueurs depuis la BDD
async function loadPlayers() {
    try {
        const result = await apiCall('players.php');
        const container = document.getElementById('playersGrid');
        container.innerHTML = '';
        
        result.players.forEach(player => {
            const card = document.createElement('div');
            card.className = 'player-card';
            
            const strengthsHtml = player.strengths.map(s => `<span class="tag strength">${s}</span>`).join('');
            const weaknessesHtml = player.weaknesses.map(w => `<span class="tag weakness">${w}</span>`).join('');
            
            card.innerHTML = `
                <div class="player-header">
                    <img src="${player.photo_url}" alt="${player.name}" onerror="this.src='https://via.placeholder.com/120?text=${encodeURIComponent(player.name.charAt(0))}'">
                    <h3>${player.name}</h3>
                    <p>#${player.ranking} Mondial</p>
                </div>
                <div class="player-body">
                    <div class="stat-row">
                        <span>Âge</span>
                        <strong>${player.age} ans</strong>
                    </div>
                    <div class="stat-row">
                        <span>Nationalité</span>
                        <strong>${player.nationality}</strong>
                    </div>
                    <div class="stat-row">
                        <span>Handedness</span>
                        <strong>${player.handedness}</strong>
                    </div>
                    <div class="stat-row">
                        <span>Terre battue</span>
                        <strong>${(player.clay_win_rate * 100).toFixed(0)}%</strong>
                    </div>
                    <div class="strengths">
                        <h4>Points forts</h4>
                        ${strengthsHtml}
                    </div>
                    <div class="weaknesses">
                        <h4>Points faibles</h4>
                        ${weaknessesHtml}
                    </div>
                </div>
            `;
            
            container.appendChild(card);
        });
    } catch (error) {
        alert('Erreur lors du chargement des joueurs: ' + error.message);
    }
}

// Modal de pronostic avec analyse depuis la BDD
async function openPredictionModal(match) {
    if (match.status === 'completed') return;
    
    currentMatch = match;
    
    try {
        // Récupérer l'analyse du matchup
        const result = await apiCall(`players.php?action=matchup&player1=${match.player1.id}&player2=${match.player2.id}`);
        
        const modal = document.getElementById('predictionModal');
        const details = document.getElementById('matchDetails');
        
        details.innerHTML = `
            <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-bottom: 2rem;">
                <div style="text-align: center;">
                    <img src="${match.player1.photo}" style="width: 100px; height: 100px; border-radius: 50%; border: 3px solid #e85d04;" onerror="this.src='https://via.placeholder.com/100?text=${encodeURIComponent(match.player1.name.charAt(0))}'">
                    <h3>${match.player1.name}</h3>
                    <p>${match.player1.nationality}</p>
                </div>
                <div style="text-align: center;">
                    <img src="${match.player2.photo}" style="width: 100px; height: 100px; border-radius: 50%; border: 3px solid #e85d04;" onerror="this.src='https://via.placeholder.com/100?text=${encodeURIComponent(match.player2.name.charAt(0))}'">
                    <h3>${match.player2.name}</h3>
                    <p>${match.player2.nationality}</p>
                </div>
            </div>
            <p style="text-align: center; color: #666;">${match.round} - ${match.court}</p>
        `;
        
        // Afficher les probabilités
        document.getElementById('prob1').style.width = `${result.probabilities.player1}%`;
        document.getElementById('prob2').style.width = `${result.probabilities.player2}%`;
        document.getElementById('probText1').textContent = `${result.probabilities.player1}%`;
        document.getElementById('probText2').textContent = `${result.probabilities.player2}%`;
        
        // Afficher l'analyse
        const analysisDiv = document.getElementById('matchupAnalysis');
        analysisDiv.innerHTML = `
            <h3>Analyse du Matchup</h3>
            <div class="analysis-grid">
                <div class="advantage">
                    <h4>Avantages ${match.player1.name}</h4>
                    <ul>
                        ${result.analysis.player1_advantages.map(a => `<li>${a}</li>`).join('')}
                    </ul>
                </div>
                <div class="advantage">
                    <h4>Avantages ${match.player2.name}</h4>
                    <ul>
                        ${result.analysis.player2_advantages.map(a => `<li>${a}</li>`).join('')}
                    </ul>
                </div>
            </div>
        `;
        
        modal.style.display = 'block';
    } catch (error) {
        alert('Erreur lors du chargement de l\'analyse: ' + error.message);
    }
}

function closePredictionModal() {
    document.getElementById('predictionModal').style.display = 'none';
    currentMatch = null;
}

// Faire un pronostic via l'API
async function makePrediction(playerNum) {
    if (!currentMatch || !currentUser) return;
    
    const winnerId = playerNum === 1 ? currentMatch.player1.id : currentMatch.player2.id;
    const winnerName = playerNum === 1 ? currentMatch.player1.name : currentMatch.player2.name;
    
    try {
        const result = await apiCall('predictions.php', 'POST', {
            match_id: currentMatch.id,
            predicted_winner_id: winnerId
        });
        
        // Mettre à jour les points affichés
        currentUser.points += result.points_earned;
        document.getElementById('userPoints').textContent = `${currentUser.points} pts`;
        localStorage.setItem('currentUser', JSON.stringify(currentUser));
        
        alert(`Pronostic enregistré! Vous avez choisi ${winnerName}\n+${result.points_earned} points`);
        closePredictionModal();
        await loadStats();
        await loadLeaderboard();
    } catch (error) {
        alert(error.message);
    }
}

// Charger le classement depuis la BDD
async function loadLeaderboard() {
    try {
        const result = await apiCall('predictions.php?action=leaderboard');
        const tbody = document.getElementById('leaderboardBody');
        tbody.innerHTML = '';
        
        result.leaderboard.forEach(user => {
            const row = document.createElement('tr');
            const isCurrentUser = user.user_id === currentUser.id;
            
            row.innerHTML = `
                <td>${user.rank}</td>
                <td>${user.username} ${isCurrentUser ? '(Vous)' : ''}</td>
                <td>${user.points}</td>
                <td>${user.correct_predictions}</td>
            `;
            
            if (isCurrentUser) {
                row.style.background = '#faf3e0';
                row.style.fontWeight = 'bold';
            }
            
            tbody.appendChild(row);
        });
    } catch (error) {
        console.error('Erreur leaderboard:', error);
    }
}

// Charger les stats utilisateur depuis la BDD
async function loadStats() {
    try {
        const result = await apiCall('predictions.php?action=stats');
        document.getElementById('totalPredictions').textContent = result.stats.total_predictions;
        document.getElementById('successRate').textContent = `${result.stats.success_rate}%`;
        document.getElementById('bestStreak').textContent = result.stats.correct_predictions;
    } catch (error) {
        console.error('Erreur stats:', error);
    }
}

// Fermer modal en cliquant dehors
window.onclick = function(event) {
    const modal = document.getElementById('predictionModal');
    if (event.target === modal) {
        closePredictionModal();
    }
}