// === MODULE MEMORY MATCH ===

class MemoryMatchGame {
    constructor(options) {
        this.container = options.container;
        this.content = options.content;
        this.onScoreUpdate = options.onScoreUpdate || (() => {});
        this.onGameEnd = options.onGameEnd || (() => {});
        
        // Game state
        this.cards = [];
        this.flippedCards = [];
        this.matchedPairs = 0;
        this.totalPairs = 8; // 4x4 grid = 16 cards = 8 pairs
        this.moves = 0;
        this.score = 0;
        this.isFlipping = false;
        
        // Extract vocabulary
        this.vocabulary = this.extractVocabulary(this.content);
        
        this.init();
    }

    init() {
        // Check if we have enough vocabulary
        if (!this.vocabulary || this.vocabulary.length < this.totalPairs) {
            console.error('Not enough vocabulary for Memory Match');
            this.showInitError();
            return;
        }
        
        this.createGameInterface();
        this.generateCards();
        this.setupEventListeners();
    }
    
    showInitError() {
        this.container.innerHTML = `
            <div class="game-error">
                <h3>❌ Error loading</h3>
                <p>This content doesn't have enough vocabulary for Memory Match.</p>
                <p>The game needs at least ${this.totalPairs} vocabulary pairs.</p>
                <button onclick="AppNavigation.goBack()" class="back-btn">← Back</button>
            </div>
        `;
    }

    extractVocabulary(content) {
        let vocabulary = [];
        
        console.log('📝 Extracting vocabulary from:', content?.name || 'content');
        
        // Use raw module content if available
        if (content.rawContent) {
            console.log('📦 Using raw module content');
            return this.extractVocabularyFromRaw(content.rawContent);
        }
        
        // Modern format with contentItems
        if (content.contentItems && Array.isArray(content.contentItems)) {
            console.log('🆕 ContentItems format detected');
            const vocabItems = content.contentItems.filter(item => item.type === 'vocabulary');
            if (vocabItems.length > 0) {
                vocabulary = vocabItems[0].items || [];
            }
        }
        // Legacy format with vocabulary array
        else if (content.vocabulary && Array.isArray(content.vocabulary)) {
            console.log('📚 Vocabulary array format detected');
            vocabulary = content.vocabulary;
        }
        
        return this.finalizeVocabulary(vocabulary);
    }
    
    extractVocabularyFromRaw(rawContent) {
        console.log('🔧 Extracting from raw content:', rawContent.name || 'Module');
        let vocabulary = [];
        
        // Check vocabulary object format (key-value pairs)
        if (rawContent.vocabulary && typeof rawContent.vocabulary === 'object' && !Array.isArray(rawContent.vocabulary)) {
            vocabulary = Object.entries(rawContent.vocabulary).map(([english, translation]) => ({
                english: english,
                french: translation
            }));
            console.log(`📝 ${vocabulary.length} vocabulary pairs extracted from object`);
        }
        // Check vocabulary array format
        else if (rawContent.vocabulary && Array.isArray(rawContent.vocabulary)) {
            vocabulary = rawContent.vocabulary;
            console.log(`📚 ${vocabulary.length} vocabulary items extracted from array`);
        }
        
        return this.finalizeVocabulary(vocabulary);
    }
    
    finalizeVocabulary(vocabulary) {
        // Filter and validate vocabulary
        vocabulary = vocabulary.filter(item => 
            item && 
            item.english && 
            (item.french || item.translation || item.chinese)
        ).map(item => ({
            english: item.english,
            french: item.french || item.translation || item.chinese
        }));
        
        if (vocabulary.length === 0) {
            console.error('❌ No valid vocabulary found');
            // Demo vocabulary as fallback
            vocabulary = [
                { english: "cat", french: "chat" },
                { english: "dog", french: "chien" },
                { english: "house", french: "maison" },
                { english: "car", french: "voiture" },
                { english: "book", french: "livre" },
                { english: "water", french: "eau" },
                { english: "food", french: "nourriture" },
                { english: "friend", french: "ami" }
            ];
            console.warn('🚨 Using demo vocabulary');
        }
        
        console.log(`✅ Memory Match: ${vocabulary.length} vocabulary items finalized`);
        return vocabulary;
    }

    createGameInterface() {
        this.container.innerHTML = `
            <div class="memory-match-wrapper">
                <!-- Game Stats -->
                <div class="game-stats">
                    <div class="stat-item">
                        <span class="stat-label">Moves:</span>
                        <span id="moves-counter">0</span>
                    </div>
                    <div class="stat-item">
                        <span class="stat-label">Pairs:</span>
                        <span id="pairs-counter">0 / ${this.totalPairs}</span>
                    </div>
                    <div class="stat-item">
                        <span class="stat-label">Score:</span>
                        <span id="score-counter">0</span>
                    </div>
                </div>

                <!-- Game Grid -->
                <div class="memory-grid" id="memory-grid">
                    <!-- Cards will be generated here -->
                </div>

                <!-- Game Controls -->
                <div class="game-controls">
                    <button class="control-btn secondary" id="restart-btn">🔄 Restart</button>
                    <button class="control-btn secondary" id="hint-btn">💡 Hint</button>
                </div>

                <!-- Feedback Area -->
                <div class="feedback-area" id="feedback-area">
                    <div class="instruction">
                        Click cards to flip them and find matching pairs!
                    </div>
                </div>
            </div>
        `;
    }

    generateCards() {
        // Select random vocabulary pairs
        const selectedVocab = this.vocabulary
            .sort(() => Math.random() - 0.5)
            .slice(0, this.totalPairs);
        
        // Create card pairs
        this.cards = [];
        selectedVocab.forEach((item, index) => {
            // English card
            this.cards.push({
                id: `en_${index}`,
                content: item.english,
                type: 'english',
                pairId: index,
                isFlipped: false,
                isMatched: false
            });
            
            // French card
            this.cards.push({
                id: `fr_${index}`,
                content: item.french,
                type: 'french',
                pairId: index,
                isFlipped: false,
                isMatched: false
            });
        });
        
        // Shuffle cards
        this.cards.sort(() => Math.random() - 0.5);
        
        // Render cards
        this.renderCards();
    }

    renderCards() {
        const grid = document.getElementById('memory-grid');
        grid.innerHTML = '';
        
        this.cards.forEach((card, index) => {
            const cardElement = document.createElement('div');
            cardElement.className = 'memory-card';
            cardElement.dataset.cardIndex = index;
            
            cardElement.innerHTML = `
                <div class="card-inner">
                    <div class="card-front">
                        <span class="card-icon">🎯</span>
                    </div>
                    <div class="card-back">
                        <span class="card-content">${card.content}</span>
                    </div>
                </div>
            `;
            
            cardElement.addEventListener('click', () => this.flipCard(index));
            grid.appendChild(cardElement);
        });
    }

    setupEventListeners() {
        document.getElementById('restart-btn').addEventListener('click', () => this.restart());
        document.getElementById('hint-btn').addEventListener('click', () => this.showHint());
    }

    flipCard(cardIndex) {
        if (this.isFlipping) return;
        
        const card = this.cards[cardIndex];
        if (card.isFlipped || card.isMatched) return;
        
        // Flip the card
        card.isFlipped = true;
        this.updateCardDisplay(cardIndex);
        this.flippedCards.push(cardIndex);
        
        if (this.flippedCards.length === 2) {
            this.moves++;
            this.updateStats();
            this.checkMatch();
        }
    }

    updateCardDisplay(cardIndex) {
        const cardElement = document.querySelector(`[data-card-index="${cardIndex}"]`);
        const card = this.cards[cardIndex];
        
        if (card.isFlipped || card.isMatched) {
            cardElement.classList.add('flipped');
        } else {
            cardElement.classList.remove('flipped');
        }
        
        if (card.isMatched) {
            cardElement.classList.add('matched');
        }
    }

    checkMatch() {
        this.isFlipping = true;
        
        setTimeout(() => {
            const [firstIndex, secondIndex] = this.flippedCards;
            const firstCard = this.cards[firstIndex];
            const secondCard = this.cards[secondIndex];
            
            if (firstCard.pairId === secondCard.pairId) {
                // Match found!
                firstCard.isMatched = true;
                secondCard.isMatched = true;
                this.updateCardDisplay(firstIndex);
                this.updateCardDisplay(secondIndex);
                
                this.matchedPairs++;
                this.score += 100;
                this.showFeedback('Great match! 🎉', 'success');

                // Trigger success animation
                this.triggerSuccessAnimation(firstIndex, secondIndex);

                if (this.matchedPairs === this.totalPairs) {
                    setTimeout(() => this.gameComplete(), 800);
                }
            } else {
                // No match, flip back and apply penalty
                firstCard.isFlipped = false;
                secondCard.isFlipped = false;
                this.updateCardDisplay(firstIndex);
                this.updateCardDisplay(secondIndex);
                
                // Apply penalty but don't go below 0
                this.score = Math.max(0, this.score - 10);
                this.showFeedback('Try again! (-10 points)', 'warning');
            }
            
            this.flippedCards = [];
            this.isFlipping = false;
            this.updateStats();
        }, 1000);
    }

    showHint() {
        if (this.flippedCards.length > 0) {
            this.showFeedback('Finish your current move first!', 'warning');
            return;
        }
        
        // Find first unmatched pair
        const unmatchedCards = this.cards.filter(card => !card.isMatched);
        if (unmatchedCards.length === 0) return;
        
        // Group by pairId
        const pairs = {};
        unmatchedCards.forEach((card, index) => {
            const actualIndex = this.cards.indexOf(card);
            if (!pairs[card.pairId]) {
                pairs[card.pairId] = [];
            }
            pairs[card.pairId].push(actualIndex);
        });
        
        // Find first complete pair
        const completePair = Object.values(pairs).find(pair => pair.length === 2);
        if (completePair) {
            // Briefly show the pair
            completePair.forEach(cardIndex => {
                const cardElement = document.querySelector(`[data-card-index="${cardIndex}"]`);
                cardElement.classList.add('hint');
            });
            
            setTimeout(() => {
                completePair.forEach(cardIndex => {
                    const cardElement = document.querySelector(`[data-card-index="${cardIndex}"]`);
                    cardElement.classList.remove('hint');
                });
            }, 2000);
            
            this.showFeedback('Hint shown for 2 seconds!', 'info');
        }
    }

    updateStats() {
        document.getElementById('moves-counter').textContent = this.moves;
        document.getElementById('pairs-counter').textContent = `${this.matchedPairs} / ${this.totalPairs}`;
        document.getElementById('score-counter').textContent = this.score;
        this.onScoreUpdate(this.score);
    }

    gameComplete() {
        // Calculate bonus based on moves
        const perfectMoves = this.totalPairs;
        if (this.moves <= perfectMoves + 5) {
            this.score += 200; // Efficiency bonus
        }
        
        this.updateStats();
        this.showFeedback('🎉 Congratulations! All pairs found!', 'success');
        
        setTimeout(() => {
            this.onGameEnd(this.score);
        }, 2000);
    }

    showFeedback(message, type = 'info') {
        const feedbackArea = document.getElementById('feedback-area');
        feedbackArea.innerHTML = `<div class="instruction ${type}">${message}</div>`;
    }

    start() {
        console.log('🧠 Memory Match: Starting');
        this.showFeedback('Find matching English-French pairs!', 'info');
    }

    restart() {
        console.log('🔄 Memory Match: Restarting');
        this.reset();
        this.start();
    }

    reset() {
        this.flippedCards = [];
        this.matchedPairs = 0;
        this.moves = 0;
        this.score = 0;
        this.isFlipping = false;
        this.generateCards();
        this.updateStats();
    }

    triggerSuccessAnimation(cardIndex1, cardIndex2) {
        // Get card elements
        const card1 = document.querySelector(`[data-card-index="${cardIndex1}"]`);
        const card2 = document.querySelector(`[data-card-index="${cardIndex2}"]`);

        if (!card1 || !card2) return;

        // Add success animation class
        card1.classList.add('success-animation');
        card2.classList.add('success-animation');

        // Create sparkle particles for both cards
        this.createSparkleParticles(card1);
        this.createSparkleParticles(card2);

        // Remove animation class after animation completes
        setTimeout(() => {
            card1.classList.remove('success-animation');
            card2.classList.remove('success-animation');
        }, 800);
    }

    createSparkleParticles(cardElement) {
        const rect = cardElement.getBoundingClientRect();

        // Create 4 sparkle particles around the card
        for (let i = 1; i <= 4; i++) {
            const particle = document.createElement('div');
            particle.className = `success-particle particle-${i}`;

            // Position relative to card
            particle.style.position = 'fixed';
            particle.style.left = (rect.left + rect.width / 2) + 'px';
            particle.style.top = (rect.top + rect.height / 2) + 'px';
            particle.style.pointerEvents = 'none';
            particle.style.zIndex = '1000';

            document.body.appendChild(particle);

            // Remove particle after animation
            setTimeout(() => {
                if (particle.parentNode) {
                    particle.parentNode.removeChild(particle);
                }
            }, 1200);
        }
    }

    destroy() {
        this.container.innerHTML = '';
    }
}

// Module registration
window.GameModules = window.GameModules || {};
window.GameModules.MemoryMatch = MemoryMatchGame;