class KidsCodeApp {
    constructor() {
        this.codeBlocks = [];
        this.character = document.getElementById('character');
        this.dropZone = document.getElementById('drop-zone');
        this.runButton = document.getElementById('run-button');
        this.clearButton = document.getElementById('clear-button');
        this.checkButton = document.getElementById('check-button');
        this.isRunning = false;
        this.currentAssignment = 0;
        this.characterColors = ['🐱', '🦊', '🐰', '🐸', '🐼'];
        this.currentColorIndex = 0;
        
        this.sounds = {
            dance: this.createSound(440, 0.3, 'triangle'),
            jump: this.createSound(660, 0.2, 'square'),
            wave: this.createSound(330, 0.4, 'sine'),
            sound: this.createSound(880, 0.3, 'sawtooth'),
            spin: this.createSound(392, 0.4, 'sine'),
            sleep: this.createSound(220, 0.8, 'triangle'),
            grow: this.createSound(523, 0.3, 'square'),
            shrink: this.createSound(294, 0.3, 'square'),
            color: this.createSound(659, 0.2, 'sawtooth'),
            success: this.createSound(523, 0.2, 'sine'),
            complete: this.createSound([523, 659, 784], 0.5, 'sine')
        };
        
        this.assignments = [
            {
                title: "First Steps!",
                description: "Let's make Cody dance! 🎉",
                goal: "Use the Dance block",
                solution: ["dance"],
                hint: "Drag the 💃 Dance block to your code area and press Play!"
            },
            {
                title: "Jump for Joy!",
                description: "Now make Cody jump up high! 🦘",
                goal: "Use the Jump block",
                solution: ["jump"],
                hint: "Find the 🦘 Jump block and drag it over!"
            },
            {
                title: "Dance Party!",
                description: "Make Cody dance AND jump! 🎊",
                goal: "Use Dance then Jump blocks",
                solution: ["dance", "jump"],
                hint: "Put two blocks together - Dance first, then Jump!"
            },
            {
                title: "Say Hello!",
                description: "Make Cody wave hello to everyone! 👋",
                goal: "Use the Wave block",
                solution: ["wave"],
                hint: "The 👋 Wave block will make Cody friendly!"
            },
            {
                title: "Make Some Noise!",
                description: "Let Cody make a fun sound! 🔊",
                goal: "Use the Make Sound block",
                solution: ["sound"],
                hint: "The 🔊 Make Sound block is waiting for you!"
            },
            {
                title: "Spin Around!",
                description: "Make Cody spin like a tornado! 🌪️",
                goal: "Use the Spin block",
                solution: ["spin"],
                hint: "Find the 🌀 Spin block to make Cody dizzy!"
            },
            {
                title: "Growing Up!",
                description: "Make Cody grow big and then small! 📏",
                goal: "Use Grow Big then Get Small blocks",
                solution: ["grow", "shrink"],
                hint: "First 🔍 Grow Big, then 🔎 Get Small!"
            },
            {
                title: "Colorful Cat!",
                description: "Change Cody's look with colors! 🎨",
                goal: "Use the Change Color block",
                solution: ["color"],
                hint: "The 🎨 Change Color block makes Cody look different!"
            },
            {
                title: "Repeat Magic!",
                description: "Make Cody dance twice using repeat! 🔄",
                goal: "Use Repeat 1 time then Dance",
                solution: ["repeat", "dance"],
                hint: "Put 🔄 Repeat 1 time first, then 💃 Dance after it!"
            },
            {
                title: "Grand Finale!",
                description: "Create an amazing show! Use 4 different blocks! 🌟",
                goal: "Use any 4 different action blocks",
                solution: ["dance", "jump", "spin", "sound"],
                hint: "Mix and match your favorite blocks to create a show!",
                flexible: true
            }
        ];
        
        this.init();
    }
    
    init() {
        this.setupDragAndDrop();
        this.setupButtons();
        this.setupAssignmentPanel();
        this.hideDropHint();
        this.loadAssignment(0);
    }
    
    createSound(frequency, duration, type = 'sine') {
        return () => {
            try {
                const audioContext = new (window.AudioContext || window.webkitAudioContext)();
                
                if (Array.isArray(frequency)) {
                    frequency.forEach((freq, index) => {
                        setTimeout(() => {
                            const oscillator = audioContext.createOscillator();
                            const gainNode = audioContext.createGain();
                            
                            oscillator.connect(gainNode);
                            gainNode.connect(audioContext.destination);
                            
                            oscillator.frequency.setValueAtTime(freq, audioContext.currentTime);
                            oscillator.type = type;
                            
                            gainNode.gain.setValueAtTime(0.2, audioContext.currentTime);
                            gainNode.gain.exponentialRampToValueAtTime(0.01, audioContext.currentTime + duration / 3);
                            
                            oscillator.start(audioContext.currentTime);
                            oscillator.stop(audioContext.currentTime + duration / 3);
                        }, index * (duration * 1000 / 3));
                    });
                } else {
                    const oscillator = audioContext.createOscillator();
                    const gainNode = audioContext.createGain();
                    
                    oscillator.connect(gainNode);
                    gainNode.connect(audioContext.destination);
                    
                    oscillator.frequency.setValueAtTime(frequency, audioContext.currentTime);
                    oscillator.type = type;
                    
                    gainNode.gain.setValueAtTime(0.3, audioContext.currentTime);
                    gainNode.gain.exponentialRampToValueAtTime(0.01, audioContext.currentTime + duration);
                    
                    oscillator.start(audioContext.currentTime);
                    oscillator.stop(audioContext.currentTime + duration);
                }
            } catch (error) {
                console.log('Audio not available');
            }
        };
    }
    
    setupDragAndDrop() {
        const blocks = document.querySelectorAll('.block[draggable="true"]');
        
        blocks.forEach(block => {
            block.addEventListener('dragstart', (e) => {
                e.dataTransfer.setData('text/plain', JSON.stringify({
                    type: block.dataset.blockType,
                    html: block.outerHTML
                }));
            });
        });
        
        this.dropZone.addEventListener('dragover', (e) => {
            e.preventDefault();
            this.dropZone.classList.add('drag-over');
        });
        
        this.dropZone.addEventListener('dragleave', (e) => {
            if (!this.dropZone.contains(e.relatedTarget)) {
                this.dropZone.classList.remove('drag-over');
            }
        });
        
        this.dropZone.addEventListener('drop', (e) => {
            e.preventDefault();
            this.dropZone.classList.remove('drag-over');
            
            try {
                const blockData = JSON.parse(e.dataTransfer.getData('text/plain'));
                this.addBlock(blockData);
            } catch (error) {
                console.error('Error parsing block data:', error);
            }
        });
    }
    
    addBlock(blockData) {
        this.hideDropHint();
        
        const blockElement = document.createElement('div');
        blockElement.innerHTML = blockData.html;
        const block = blockElement.firstChild;
        
        block.classList.add('code-block');
        block.draggable = false;
        
        const deleteBtn = document.createElement('button');
        deleteBtn.className = 'delete-btn';
        deleteBtn.innerHTML = '✕';
        deleteBtn.addEventListener('click', () => {
            this.removeBlock(block);
        });
        
        block.appendChild(deleteBtn);
        
        this.dropZone.appendChild(block);
        this.codeBlocks.push({
            element: block,
            type: blockData.type
        });
        
        this.addBlockConnector();
    }
    
    addBlockConnector() {
        if (this.codeBlocks.length > 1) {
            const connector = document.createElement('div');
            connector.className = 'block-connector';
            connector.innerHTML = '⬇️';
            connector.style.cssText = `
                text-align: center;
                font-size: 20px;
                margin: 5px 0;
                color: #a0aec0;
            `;
            
            const lastBlock = this.codeBlocks[this.codeBlocks.length - 2].element;
            lastBlock.insertAdjacentElement('afterend', connector);
        }
    }
    
    removeBlock(blockElement) {
        const index = this.codeBlocks.findIndex(block => block.element === blockElement);
        if (index !== -1) {
            this.codeBlocks.splice(index, 1);
            
            const nextElement = blockElement.nextElementSibling;
            if (nextElement && nextElement.classList.contains('block-connector')) {
                nextElement.remove();
            }
            
            const prevElement = blockElement.previousElementSibling;
            if (prevElement && prevElement.classList.contains('block-connector') && 
                (!blockElement.nextElementSibling || !blockElement.nextElementSibling.classList.contains('code-block'))) {
                prevElement.remove();
            }
            
            blockElement.remove();
            
            if (this.codeBlocks.length === 0) {
                this.showDropHint();
            }
        }
    }
    
    hideDropHint() {
        const dropHint = this.dropZone.querySelector('.drop-hint');
        if (dropHint) {
            dropHint.style.display = 'none';
        }
    }
    
    showDropHint() {
        const dropHint = this.dropZone.querySelector('.drop-hint');
        if (dropHint) {
            dropHint.style.display = 'block';
        }
    }
    
    setupButtons() {
        this.runButton.addEventListener('click', () => {
            if (!this.isRunning) {
                this.runCode();
            }
        });
        
        this.checkButton.addEventListener('click', () => {
            if (!this.isRunning) {
                this.checkAssignment();
            }
        });
        
        this.clearButton.addEventListener('click', () => {
            this.clearCode();
        });
    }
    
    async runCode() {
        if (this.codeBlocks.length === 0) {
            this.showMessage('Add some blocks first! 🧩');
            return;
        }
        
        this.isRunning = true;
        this.runButton.disabled = true;
        this.runButton.querySelector('.button-text').textContent = 'Running...';
        
        try {
            await this.executeBlocks();
            this.sounds.success();
            this.showMessage('Great job! 🎉');
        } catch (error) {
            console.error('Error running code:', error);
            this.showMessage('Oops! Something went wrong 😅');
        } finally {
            this.isRunning = false;
            this.runButton.disabled = false;
            this.runButton.querySelector('.button-text').textContent = 'Play';
        }
    }
    
    async executeBlocks() {
        for (let i = 0; i < this.codeBlocks.length; i++) {
            const block = this.codeBlocks[i];
            
            block.element.style.outline = '3px solid #4facfe';
            block.element.style.boxShadow = '0 0 20px rgba(79, 172, 254, 0.5)';
            
            await this.executeBlock(block);
            
            block.element.style.outline = '';
            block.element.style.boxShadow = '';
            
            await this.wait(200);
        }
    }
    
    async executeBlock(block) {
        switch (block.type) {
            case 'dance':
                await this.makeDance();
                break;
            case 'jump':
                await this.makeJump();
                break;
            case 'wave':
                await this.makeWave();
                break;
            case 'sound':
                await this.makeSound();
                break;
            case 'spin':
                await this.makeSpin();
                break;
            case 'sleep':
                await this.makeSleep();
                break;
            case 'grow':
                await this.makeGrow();
                break;
            case 'shrink':
                await this.makeShrink();
                break;
            case 'color':
                await this.changeColor();
                break;
            case 'repeat':
                await this.executeRepeat(block);
                break;
            case 'wait':
                await this.wait(1000);
                break;
        }
    }
    
    async executeRepeat(repeatBlock) {
        const repeatCount = 1;
        const startIndex = this.codeBlocks.indexOf(repeatBlock);
        const blocksToRepeat = [];
        
        for (let i = startIndex + 1; i < this.codeBlocks.length; i++) {
            const nextBlock = this.codeBlocks[i];
            if (nextBlock.type === 'repeat') break;
            blocksToRepeat.push(nextBlock);
        }
        
        for (let rep = 0; rep < repeatCount; rep++) {
            for (const blockToRepeat of blocksToRepeat) {
                await this.executeBlock(blockToRepeat);
                await this.wait(200);
            }
        }
    }
    
    async makeDance() {
        this.character.classList.add('dancing');
        this.sounds.dance();
        await this.wait(1000);
        this.character.classList.remove('dancing');
    }
    
    async makeJump() {
        this.character.classList.add('jumping');
        this.sounds.jump();
        await this.wait(600);
        this.character.classList.remove('jumping');
    }
    
    async makeWave() {
        this.character.classList.add('waving');
        this.sounds.wave();
        await this.wait(1000);
        this.character.classList.remove('waving');
    }
    
    async makeSound() {
        this.character.classList.add('bouncing');
        this.sounds.sound();
        await this.wait(500);
        this.character.classList.remove('bouncing');
    }
    
    async makeSpin() {
        this.character.classList.add('spinning');
        this.sounds.spin();
        await this.wait(800);
        this.character.classList.remove('spinning');
    }
    
    async makeSleep() {
        this.character.classList.add('sleeping');
        this.sounds.sleep();
        await this.wait(1200);
        this.character.classList.remove('sleeping');
    }
    
    async makeGrow() {
        this.character.classList.add('growing');
        this.sounds.grow();
        await this.wait(600);
        this.character.classList.remove('growing');
    }
    
    async makeShrink() {
        this.character.classList.add('shrinking');
        this.sounds.shrink();
        await this.wait(600);
        this.character.classList.remove('shrinking');
    }
    
    async changeColor() {
        this.currentColorIndex = (this.currentColorIndex + 1) % this.characterColors.length;
        const characterBody = this.character.querySelector('.character-body');
        characterBody.textContent = this.characterColors[this.currentColorIndex];
        this.sounds.color();
        await this.wait(300);
    }
    
    clearCode() {
        this.codeBlocks.forEach(block => {
            block.element.remove();
        });
        
        const connectors = this.dropZone.querySelectorAll('.block-connector');
        connectors.forEach(connector => connector.remove());
        
        this.codeBlocks = [];
        this.showDropHint();
        this.showMessage('All cleared! Ready for new code 🧹');
    }
    
    showMessage(text) {
        const existingMessage = document.querySelector('.message-popup');
        if (existingMessage) {
            existingMessage.remove();
        }
        
        const message = document.createElement('div');
        message.className = 'message-popup';
        message.textContent = text;
        message.style.cssText = `
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            color: white;
            padding: 20px 30px;
            border-radius: 20px;
            font-size: 24px;
            font-weight: bold;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            z-index: 1000;
            animation: messagePopup 0.3s ease-out;
        `;
        
        const style = document.createElement('style');
        style.textContent = `
            @keyframes messagePopup {
                0% { transform: translate(-50%, -50%) scale(0.5); opacity: 0; }
                100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
            }
        `;
        document.head.appendChild(style);
        
        document.body.appendChild(message);
        
        setTimeout(() => {
            message.style.animation = 'messagePopup 0.3s ease-out reverse';
            setTimeout(() => {
                message.remove();
                style.remove();
            }, 300);
        }, 2000);
    }
    
    setupAssignmentPanel() {
        const showBtn = document.getElementById('show-assignment');
        const closeBtn = document.getElementById('close-assignment');
        const prevBtn = document.getElementById('prev-assignment');
        const nextBtn = document.getElementById('next-assignment');
        const panel = document.getElementById('assignment-panel');
        
        showBtn.addEventListener('click', () => {
            panel.style.display = 'block';
            this.checkButton.style.display = 'inline-flex';
        });
        
        closeBtn.addEventListener('click', () => {
            panel.style.display = 'none';
            this.checkButton.style.display = 'none';
        });
        
        prevBtn.addEventListener('click', () => {
            if (this.currentAssignment > 0) {
                this.currentAssignment--;
                this.loadAssignment(this.currentAssignment);
            }
        });
        
        nextBtn.addEventListener('click', () => {
            if (this.currentAssignment < this.assignments.length - 1) {
                this.currentAssignment++;
                this.loadAssignment(this.currentAssignment);
            }
        });
    }
    
    loadAssignment(index) {
        const assignment = this.assignments[index];
        if (!assignment) return;
        
        document.querySelector('.assignment-title').textContent = assignment.title;
        document.querySelector('.assignment-description').textContent = assignment.description;
        document.querySelector('.assignment-goal').textContent = `🎯 Goal: ${assignment.goal}`;
        document.querySelector('.assignment-counter').textContent = `${index + 1} / ${this.assignments.length}`;
        
        const prevBtn = document.getElementById('prev-assignment');
        const nextBtn = document.getElementById('next-assignment');
        
        prevBtn.disabled = index === 0;
        nextBtn.disabled = index === this.assignments.length - 1;
        
        this.clearCode();
    }
    
    checkAssignment() {
        const assignment = this.assignments[this.currentAssignment];
        if (!assignment) return;
        
        const currentBlocks = this.codeBlocks.map(block => block.type);
        
        let isCorrect = false;
        
        if (assignment.flexible && assignment.title.includes('Grand Finale')) {
            const uniqueActionBlocks = currentBlocks.filter(block => 
                ['dance', 'jump', 'wave', 'sound', 'spin', 'sleep', 'grow', 'shrink', 'color'].includes(block)
            );
            const uniqueActions = new Set(uniqueActionBlocks);
            isCorrect = uniqueActions.size >= 4;
        } else {
            isCorrect = JSON.stringify(currentBlocks) === JSON.stringify(assignment.solution);
        }
        
        if (isCorrect) {
            this.sounds.complete();
            this.showMessage(`🎉 Amazing! You completed: ${assignment.title}!`);
            
            setTimeout(() => {
                if (this.currentAssignment < this.assignments.length - 1) {
                    this.showMessage('🚀 Ready for the next challenge?');
                } else {
                    this.showMessage('🏆 Congratulations! You completed all missions!');
                }
            }, 2500);
        } else {
            this.showMessage(`💡 Hint: ${assignment.hint}`);
        }
    }
    
    wait(ms) {
        return new Promise(resolve => setTimeout(resolve, ms));
    }
}

document.addEventListener('DOMContentLoaded', () => {
    new KidsCodeApp();
});