// 数据存储
let wardrobe = {
    tops: [],      // 上衣
    bottoms: [],   // 下装
    shoes: []      // 鞋子
};

// 当前旋转角度
let rotations = {
    top: 0,
    bottom: 0,
    shoes: 0
};

// 当前选中的索引
let selectedIndices = {
    top: 0,
    bottom: 0,
    shoes: 0
};

// 拖动状态
let isDragging = false;
let currentRing = null;
let startX = 0;
let startRotation = 0;

// 初始化
document.addEventListener('DOMContentLoaded', () => {
    loadFromStorage();
    setupEventListeners();
    setupRings();
    updateUI();
    updateCounts();
});

// 设置事件监听
function setupEventListeners() {
    // 文件上传
    const photoInput = document.getElementById('photo-input');
    photoInput.addEventListener('change', handlePhotoUpload);

    // 圆环拖动
    const rings = ['ring-top', 'ring-bottom', 'ring-shoes'];
    rings.forEach(ringId => {
        const ring = document.getElementById(ringId);
        const type = ringId.replace('ring-', '');
        
        ring.addEventListener('mousedown', (e) => startDrag(e, type));
        ring.addEventListener('touchstart', (e) => startDrag(e, type), {passive: false});
    });

    document.addEventListener('mousemove', drag);
    document.addEventListener('touchmove', drag, {passive: false});
    document.addEventListener('mouseup', endDrag);
    document.addEventListener('touchend', endDrag);

    // 滚轮支持
    document.getElementById('ring-top').addEventListener('wheel', (e) => handleWheel(e, 'top'));
    document.getElementById('ring-bottom').addEventListener('wheel', (e) => handleWheel(e, 'bottom'));
    document.getElementById('ring-shoes').addEventListener('wheel', (e) => handleWheel(e, 'shoes'));
}

// 设置圆环初始状态
function setupRings() {
    updateRingPositions();
}

// 处理照片上传
async function handlePhotoUpload(e) {
    const file = e.target.files[0];
    if (!file) return;

    // 显示处理模态框
    showProcessingModal();

    try {
        // 读取图片
        const img = await loadImage(file);
        
        // 模拟AI处理进度
        await simulateProcessing();

        // 分割图片（模拟）
        const segments = await segmentClothing(img);

        // 添加到衣橱
        wardrobe.tops.push(segments.top);
        wardrobe.bottoms.push(segments.bottom);
        wardrobe.shoes.push(segments.shoes);

        // 保存并更新
        saveToStorage();
        updateUI();
        updateCounts();
        updateRingPositions();

        // 选中新添加的
        selectedIndices.top = wardrobe.tops.length - 1;
        selectedIndices.bottom = wardrobe.bottoms.length - 1;
        selectedIndices.shoes = wardrobe.shoes.length - 1;
        
        // 旋转到新位置
        rotateToItem('top', selectedIndices.top);
        rotateToItem('bottom', selectedIndices.bottom);
        rotateToItem('shoes', selectedIndices.shoes);

        hideProcessingModal();
        
        // 显示成功提示
        showNotification('服饰添加成功！', 'success');

    } catch (error) {
        console.error('处理失败:', error);
        hideProcessingModal();
        showNotification('处理失败，请重试', 'error');
    }

    // 清空input
    e.target.value = '';
}

// 加载图片
function loadImage(file) {
    return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.onload = (e) => {
            const img = new Image();
            img.onload = () => resolve(img);
            img.onerror = reject;
            img.src = e.target.result;
        };
        reader.readAsDataURL(file);
    });
}

// 模拟处理过程
async function simulateProcessing() {
    const steps = [
        { text: '正在分析人体轮廓...', progress: 20 },
        { text: '检测上衣区域...', progress: 40 },
        { text: '检测下装区域...', progress: 60 },
        { text: '检测鞋履区域...', progress: 80 },
        { text: '优化分割边缘...', progress: 95 },
        { text: '处理完成！', progress: 100 }
    ];

    for (const step of steps) {
        document.getElementById('processing-text').textContent = step.text;
        document.getElementById('progress-bar').style.width = step.progress + '%';
        await sleep(400);
    }
}

// 模拟服装分割（使用canvas裁剪不同区域模拟）
async function segmentClothing(img) {
    const canvas = document.getElementById('process-canvas');
    const ctx = canvas.getContext('2d');

    // 设置画布尺寸
    canvas.width = 300;
    canvas.height = 400;

    // 绘制原图
    ctx.drawImage(img, 0, 0, canvas.width, canvas.height);

    // 模拟分割区域
    // 上衣：上半部分（约35%）
    const topCanvas = document.createElement('canvas');
    topCanvas.width = 300;
    topCanvas.height = 140;
    const topCtx = topCanvas.getContext('2d');
    topCtx.drawImage(canvas, 0, 0, 300, 140, 0, 0, 300, 140);
    
    // 下装：中间部分（约40%）
    const bottomCanvas = document.createElement('canvas');
    bottomCanvas.width = 300;
    bottomCanvas.height = 160;
    const bottomCtx = bottomCanvas.getContext('2d');
    bottomCtx.drawImage(canvas, 0, 140, 300, 160, 0, 0, 300, 160);
    
    // 鞋子：底部（约25%）
    const shoesCanvas = document.createElement('canvas');
    shoesCanvas.width = 300;
    shoesCanvas.height = 100;
    const shoesCtx = shoesCanvas.getContext('2d');
    shoesCtx.drawImage(canvas, 0, 300, 300, 100, 0, 0, 300, 100);

    return {
        top: topCanvas.toDataURL('image/jpeg', 0.9),
        bottom: bottomCanvas.toDataURL('image/jpeg', 0.9),
        shoes: shoesCanvas.toDataURL('image/jpeg', 0.9)
    };
}

// 更新UI显示
function updateUI() {
    updateContainer('tops-container', wardrobe.tops, 'top');
    updateContainer('bottoms-container', wardrobe.bottoms, 'bottom');
    updateContainer('shoes-container', wardrobe.shoes, 'shoes');
    updatePreviews();
}

// 更新容器内容
function updateContainer(containerId, items, type) {
    const container = document.getElementById(containerId);
    container.innerHTML = '';

    items.forEach((src, index) => {
        const div = document.createElement('div');
        div.className = `clothing-item ${selectedIndices[type] === index ? 'active' : ''}`;
        div.style.setProperty('--angle', (360 / Math.max(items.length, 1)) * index + 'deg');
        div.innerHTML = `<img src="${src}" alt="${type}">`;
        div.onclick = () => selectItem(type, index);
        container.appendChild(div);
    });
}

// 选择特定项目
function selectItem(type, index) {
    selectedIndices[type] = index;
    updateUI();
    rotateToItem(type, index);
}

// 旋转到特定项目
function rotateToItem(type, index) {
    const items = wardrobe[type === 'top' ? 'tops' : type === 'bottom' ? 'bottoms' : 'shoes'];
    if (items.length === 0) return;

    const anglePerItem = 360 / items.length;
    const targetRotation = -(index * anglePerItem);
    
    // 找到最短旋转路径
    let diff = targetRotation - rotations[type];
    while (diff > 180) diff -= 360;
    while (diff < -180) diff += 360;
    
    rotations[type] += diff;
    updateRingRotation(type);
    updatePreviews();
}

// 更新圆环位置
function updateRingPositions() {
    ['top', 'bottom', 'shoes'].forEach(type => {
        updateRingRotation(type);
    });
}

// 更新单个圆环旋转
function updateRingRotation(type) {
    const container = document.getElementById(
        type === 'top' ? 'tops-container' : 
        type === 'bottom' ? 'bottoms-container' : 
        'shoes-container'
    );
    if (container) {
        container.style.transform = `rotateY(${rotations[type]}deg)`;
    }
}

// 开始拖动
function startDrag(e, type) {
    isDragging = true;
    currentRing = type;
    startX = e.type.includes('mouse') ? e.clientX : e.touches[0].clientX;
    startRotation = rotations[type];
    e.preventDefault();
}

// 拖动中
function drag(e) {
    if (!isDragging || !currentRing) return;
    e.preventDefault();

    const x = e.type.includes('mouse') ? e.clientX : e.touches[0].clientX;
    const diff = (x - startX) * 0.5;
    rotations[currentRing] = startRotation + diff;
    updateRingRotation(currentRing);
    
    // 实时更新选中状态
    updateSelectionFromRotation(currentRing);
}

// 根据旋转角度更新选中
function updateSelectionFromRotation(type) {
    const items = wardrobe[type === 'top' ? 'tops' : type === 'bottom' ? 'bottoms' : 'shoes'];
    if (items.length === 0) return;

    const normalizedRotation = ((rotations[type] % 360) + 360) % 360;
    const anglePerItem = 360 / items.length;
    const selectedIndex = Math.round((360 - normalizedRotation) / anglePerItem) % items.length;
    
    if (selectedIndices[type] !== selectedIndex) {
        selectedIndices[type] = selectedIndex;
        updateUI();
    }
}

// 结束拖动
function endDrag() {
    if (!isDragging) return;
    
    // 吸附到最近的项目
    if (currentRing) {
        const items = wardrobe[currentRing === 'top' ? 'tops' : currentRing === 'bottom' ? 'bottoms' : 'shoes'];
        if (items.length > 0) {
            const anglePerItem = 360 / items.length;
            const currentIndex = selectedIndices[currentRing];
            const targetRotation = -(currentIndex * anglePerItem);
            
            // 平滑动画到目标位置
            animateToRotation(currentRing, targetRotation);
        }
    }
    
    isDragging = false;
    currentRing = null;
}

// 平滑动画到目标角度
function animateToRotation(type, targetRotation) {
    const startRotation = rotations[type];
    const diff = targetRotation - startRotation;
    const duration = 300;
    const startTime = performance.now();

    function animate(currentTime) {
        const elapsed = currentTime - startTime;
        const progress = Math.min(elapsed / duration, 1);
        const easeProgress = 1 - Math.pow(1 - progress, 3); // easeOutCubic
        
        rotations[type] = startRotation + diff * easeProgress;
        updateRingRotation(type);
        
        if (progress < 1) {
            requestAnimationFrame(animate);
        } else {
            updatePreviews();
        }
    }
    
    requestAnimationFrame(animate);
}

// 滚轮支持
function handleWheel(e, type) {
    e.preventDefault();
    const delta = e.deltaY > 0 ? 30 : -30;
    rotations[type] += delta;
    updateRingRotation(type);
    updateSelectionFromRotation(type);
    
    // 防抖更新预览
    clearTimeout(window.wheelTimeout);
    window.wheelTimeout = setTimeout(() => {
        updatePreviews();
    }, 150);
}

// 更新预览图
function updatePreviews() {
    const types = ['top', 'bottom', 'shoes'];
    const containers = ['preview-top', 'preview-bottom', 'preview-shoes'];
    
    types.forEach((type, i) => {
        const container = document.getElementById(containers[i]);
        const items = wardrobe[type + 's'];
        const index = selectedIndices[type];
        
        if (items.length > 0 && items[index]) {
            container.innerHTML = `<img src="${items[index]}" class="w-full h-full object-cover rounded-lg">`;
        } else {
            container.innerHTML = `<span class="text-xs text-gray-400">未选择</span>`;
        }
    });

    // 更新生成按钮状态
    const hasSelection = wardrobe.tops.length > 0 || wardrobe.bottoms.length > 0 || wardrobe.shoes.length > 0;
    document.getElementById('generate-model-btn').disabled = !hasSelection;
}

// 生成AI模特
async function generateModel() {
    const modal = document.getElementById('model-modal');
    const imgContainer = document.getElementById('model-image-container');
    const img = document.getElementById('model-image');
    const tagsContainer = document.getElementById('model-outfit-tags');
    
    // 显示模态框
    modal.classList.remove('hidden');
    modal.classList.add('flex');
    img.classList.add('hidden');
    
    // 准备提示词
    const outfit = getCurrentOutfit();
    const prompt = generatePrompt(outfit);
    
    // 显示标签
    tagsContainer.innerHTML = '';
    const tags = [];
    if (outfit.top) tags.push('上衣');
    if (outfit.bottom) tags.push('下装');
    if (outfit.shoes) tags.push('鞋履');
    
    tags.forEach(tag => {
        const span = document.createElement('span');
        span.className = 'px-3 py-1 bg-purple-100 text-purple-700 rounded-full text-sm font-medium whitespace-nowrap';
        span.textContent = tag;
        tagsContainer.appendChild(span);
    });

    try {
        // 使用 Pollinations.ai 免费API生成图片
        const encodedPrompt = encodeURIComponent(prompt);
        const seed = Math.floor(Math.random() * 10000);
        const imageUrl = `https://image.pollinations.ai/prompt/${encodedPrompt}?width=768&height=1024&seed=${seed}&nologo=true`;
        
        // 加载图片
        await new Promise((resolve, reject) => {
            img.onload = resolve;
            img.onerror = reject;
            img.src = imageUrl;
        });
        
        img.classList.remove('hidden');
        imgContainer.querySelector('.animate-pulse').parentElement.classList.add('hidden');
        
    } catch (error) {
        console.error('生成失败:', error);
        // 如果API失败，使用备用方案
        img.src = generatePlaceholderModel(outfit);
        img.classList.remove('hidden');
        imgContainer.querySelector('.animate-pulse').parentElement.classList.add('hidden');
    }
    
    lucide.createIcons();
}

// 生成提示词
function generatePrompt(outfit) {
    const basePrompt = "Full body fashion model, standing pose, white background, professional photography, high quality, detailed clothing";
    const clothing = [];
    
    if (outfit.top) clothing.push('wearing top garment');
    if (outfit.bottom) clothing.push('wearing bottom garment pants or skirt');
    if (outfit.shoes) clothing.push('wearing shoes');
    
    return `${basePrompt}, ${clothing.join(', ')}, fashion editorial style, clean lighting`;
}

// 获取当前搭配
function getCurrentOutfit() {
    return {
        top: wardrobe.tops[selectedIndices.top] || null,
        bottom: wardrobe.bottoms[selectedIndices.bottom] || null,
        shoes: wardrobe.shoes[selectedIndices.shoes] || null
    };
}

// 生成备用模特图（使用占位图）
function generatePlaceholderModel(outfit) {
    // 使用 static.photos 生成时尚相关图片
    const seed = Math.floor(Math.random() * 1000);
    return `https://static.photos/workspace/768x1024/${seed}`;
}

// 关闭模特模态框
function closeModelModal() {
    const modal = document.getElementById('model-modal');
    modal.classList.add('hidden');
    modal.classList.remove('flex');
}

// 下载模特图片
function downloadModel() {
    const img = document.getElementById('model-image');
    const link = document.createElement('a');
    link.download = `outfit-${Date.now()}.jpg`;
    link.href = img.src;
    link.click();
}

// 分享搭配
async function shareModel() {
    const outfit = getCurrentOutfit();
    const shareData = {
        title: '我的虚拟搭配',
        text: `看看我在3D虚拟试衣间创建的搭配！`,
        url: window.location.href
    };

    try {
        if (navigator.share) {
            await navigator.share(shareData);
        } else {
            // 复制到剪贴板
            await navigator.clipboard.writeText(window.location.href);
            showNotification('链接已复制到剪贴板！', 'success');
        }
    } catch (err) {
        console.log('分享失败:', err);
    }
}

// 数据持久化
function saveToStorage() {
    localStorage.setItem('virtualWardrobe', JSON.stringify(wardrobe));
    localStorage.setItem('selectedIndices', JSON.stringify(selectedIndices));
}

function loadFromStorage() {
    const saved = localStorage.getItem('virtualWardrobe');
    const savedIndices = localStorage.getItem('selectedIndices');
    
    if (saved) {
        wardrobe = JSON.parse(saved);
    }
    if (savedIndices) {
        selectedIndices = JSON.parse(savedIndices);
    }
}

// 更新计数
function updateCounts() {
    document.getElementById('count-tops').textContent = wardrobe.tops.length;
    document.getElementById('count-bottoms').textContent = wardrobe.bottoms.length;
    document.getElementById('count-shoes').textContent = wardrobe.shoes.length;
}

// 显示处理模态框
function showProcessingModal() {
    const modal = document.getElementById('processing-modal');
    modal.classList.remove('hidden');
    modal.classList.add('flex');
    document.getElementById('progress-bar').style.width = '0%';
}

function hideProcessingModal() {
    const modal = document.getElementById('processing-modal');
    modal.classList.add('hidden');
    modal.classList.remove('flex');
}

// 通知提示
function showNotification(message, type = 'success') {
    const notification = document.createElement('div');
    notification.className = `fixed top-4 left-1/2 transform -translate-x-1/2 px-6 py-3 rounded-full text-white font-medium z-50 transition-all duration-300 ${type === 'success' ? 'bg-green-500' : 'bg-red-500'}`;
    notification.textContent = message;
    document.body.appendChild(notification);
    
    setTimeout(() => {
        notification.style.opacity = '0';
        notification.style.transform = 'translate(-50%, -20px)';
        setTimeout(() => notification.remove(), 300);
    }, 3000);
}

// 工具函数
function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
}

// 键盘导航支持
document.addEventListener('keydown', (e) => {
    if (e.key === 'Escape') {
        closeModelModal();
        hideProcessingModal();
    }
    
    // 方向键控制圆环
    const step = 30;
    switch(e.key) {
        case 'ArrowUp':
            e.preventDefault();
            rotations.top += step;
            updateRingRotation('top');
            updateSelectionFromRotation('top');
            break;
        case 'ArrowDown':
            e.preventDefault();
            rotations.bottom += step;
            updateRingRotation('bottom');
            updateSelectionFromRotation('bottom');
            break;
        case 'ArrowLeft':
            e.preventDefault();
            rotations.shoes -= step;
            updateRingRotation('shoes');
            updateSelectionFromRotation('shoes');
            break;
        case 'ArrowRight':
            e.preventDefault();
            rotations.shoes += step;
            updateRingRotation('shoes');
            updateSelectionFromRotation('shoes');
            break;
    }
});