// API 配置
const API_BASE_URL = 'http://localhost:8086/api';

// 支付二维码图片配置（方便更换）
// 请将图片复制到 oederFoodVue/images/ 文件夹，然后使用相对路径
const PAYMENT_QRCODE_IMAGE = 'images/payment-qrcode.jpg';

// 应用状态
const state = {
    cart: {}, // { dishId: count } 雪花ID（字符串/数字）唯一键，彻底解决选品关联问题
    currentCategory: null,
    selectedDish: null,
    categories: [],
    dishes: []
};

// 工具函数：价格格式化（非数字兜底为0，避免NaN）
function formatPrice(price) {
    const num = parseFloat(price);
    return isNaN(num) ? 0 : num;
}

// API 调用函数 - 获取分类
async function fetchCategories() {
    try {
        const response = await fetch(`${API_BASE_URL}/categories`);
        const result = await response.json();
        if (result.code === 200) {
            state.categories = result.data || [];
            if (state.categories.length > 0 && !state.currentCategory) {
                state.currentCategory = parseInt(state.categories[0].id);
            }
        } else {
            console.error('获取分类失败:', result.message);
            alert('获取分类失败: ' + result.message);
        }
    } catch (error) {
        console.error('获取分类出错:', error);
        alert('获取分类出错，请检查后端服务是否启动');
    }
}

// API 调用函数 - 获取菜品
async function fetchDishes() {
    try {
        const response = await fetch(`${API_BASE_URL}/dishes`);
        const result = await response.json();
        if (result.code === 200) {
            state.dishes = result.data || [];
        } else {
            console.error('获取菜品失败:', result.message);
            alert('获取菜品失败: ' + result.message);
        }
    } catch (error) {
        console.error('获取菜品出错:', error);
        alert('获取菜品出错，请检查后端服务是否启动');
    }
}

// 初始化
async function init() {
    // 加载提示
    document.getElementById('dishContainer').innerHTML = '<div style="text-align:center;padding:40px;color:#999;">加载中...</div>';
    // 并行请求数据，提升速度
    await Promise.all([fetchCategories(), fetchDishes()]);
    // 渲染页面
    renderCategories();
    renderDishes();
    bindEvents();
}


// 渲染分类列表
function renderCategories() {
    const categoryList = document.getElementById('categoryList');
    if (state.categories.length === 0) {
        categoryList.innerHTML = '<div style="padding:20px;text-align:center;color:#999;">暂无分类</div>';
        return;
    }
    categoryList.innerHTML = state.categories.map(cat => {
        const catId = cat.id; // 后端返回的字符串ID
        const currentId = state.currentCategory; // 直接用字符串ID，不转数字
        return `
        <div class="category-item ${catId === currentId ? 'active' : ''}" data-id="${catId}">
            ${cat.categoryName}
        </div>
    `}).join('');
}

// 渲染菜品列表 - 全程字符串ID，无任何parseInt，彻底解决精度丢失/ID不匹配
function renderDishes() {
    const dishContainer = document.getElementById('dishContainer');
    if (state.dishes.length === 0) {
        dishContainer.innerHTML = '<div style="text-align:center;padding:40px;color:#999;">暂无菜品</div>';
        return;
    }
    // 过滤有菜品的分类：字符串ID严格相等对比，无任何转换
    const categoriesWithDishes = state.categories.filter(cat =>
        state.dishes.some(dish => dish.categoryId === cat.id)
    );
    if (categoriesWithDishes.length === 0) {
        dishContainer.innerHTML = '<div style="text-align:center;padding:40px;color:#999;">暂无菜品</div>';
        return;
    }
    // 按分类渲染菜品，全程字符串ID，data-id唯一绑定
    dishContainer.innerHTML = categoriesWithDishes.map(category => {
        const categoryId = category.id; // 纯字符串分类ID，不做任何转换
        // 过滤当前分类的菜品：字符串categoryId严格相等对比
        const dishes = state.dishes.filter(dish => dish.categoryId === categoryId);
        return `
            <div class="category-section" id="category-${categoryId}"> <!-- 字符串ID拼接，和点击的ID完全一致 -->
                <h3 class="category-title">${category.categoryName}</h3>
                <div class="dish-list">${dishes.map(dish => {
            const imgUrl = dish.coverImg || 'https://picsum.photos/100/100?text=菜品图片';
            const description = dish.description || '暂无描述';
            const tasteFeature = dish.tasteFeature || '美味';
            const adaptScene = dish.adaptScene || '推荐';
            const sales = dish.sales || 0;
            const dishId = dish.id; // 保留雪花ID原始字符串值，不做任何转换
            const inCart = state.cart[dishId]; // 仅匹配当前dishId的购物车状态

            return `
                        <div class="dish-item ${inCart ? 'in-cart' : ''}" data-id="${dishId}">
                            <img class="dish-img" src="${imgUrl}" alt="${dish.dishName}" onerror="this.src='https://picsum.photos/100/100?text=菜品图片'">
                            <div class="dish-info">
                                <div class="dish-name">${dish.dishName}</div>
                                <div class="dish-desc">${description}</div>
                                <div class="dish-tags">
                                    <span class="dish-tag">${tasteFeature}</span>
                                    <span class="dish-tag">${adaptScene}</span>
                                </div>
                                <div class="dish-footer">
                                    <div>
                                        <span class="dish-price">¥${formatPrice(dish.price).toFixed(2)}</span>
                                        <span class="dish-sales">月售${sales}</span>
                                    </div>
                                    <div class="dish-controls">
                                        ${inCart ? `
                                            <button class="control-btn minus" data-action="minus" data-id="${dishId}">-</button>
                                            <span class="dish-count">${inCart}</span>
                                        ` : ''}
                                        <button class="control-btn plus" data-action="plus" data-id="${dishId}">+</button>
                                    </div>
                                </div>
                            </div>
                        </div>
                    `}).join('')}
                </div>
            </div>
        `;
    }).join('');
}

// 更新购物车 - 核心：按dishId唯一计算，不混淆
function updateCart() {
    // 计算总数量（仅累加当前dishId的数量）
    const totalCount = Object.values(state.cart).reduce((sum, count) => sum + (Number(count) || 0), 0);
    // 计算总价（按dishId匹配菜品，精准计算）
    const totalPrice = Object.entries(state.cart).reduce((sum, [dishId, count]) => {
        const dish = state.dishes.find(d => d.id === dishId); // 精准匹配dishId
        return sum + (dish ? formatPrice(dish.price) * (Number(count) || 0) : 0);
    }, 0);

    // 更新购物车角标
    const cartCountEl = document.getElementById('cartCount');
    const cartIconEl = document.querySelector('.cart-icon');
    cartCountEl.textContent = totalCount;
    totalCount > 0 ? (cartCountEl.classList.add('show'), cartIconEl.classList.add('has-items')) : (cartCountEl.classList.remove('show'), cartIconEl.classList.remove('has-items'));

    // 更新总价和结算按钮
    document.getElementById('totalPrice').textContent = `¥${totalPrice.toFixed(2)}`;
    const checkoutBtn = document.getElementById('checkoutBtn');
    
    // 取消起送门槛，只要有商品就可以结算
    if (totalCount > 0) {
        checkoutBtn.disabled = false;
        checkoutBtn.textContent = `去结算（总计¥${totalPrice.toFixed(2)}）`;
    } else {
        checkoutBtn.disabled = true;
        checkoutBtn.textContent = `去结算`;
    }

    // 局部更新，不重渲染整个列表（性能优化+避免选品关联）
    renderCartDetail();
    updateDishCartStatus();
}

// 局部更新菜品购物车状态 - 核心：按dishId精准更新单个菜品，不影响其他
function updateDishCartStatus() {
    document.querySelectorAll('.dish-item').forEach(dishItem => {
        const dishId = dishItem.dataset.id; // 单独获取每个菜品的dishId
        const inCart = state.cart[dishId];   // 仅判断当前dishId的购物车状态
        const controlsDiv = dishItem.querySelector('.dish-controls');

        // 单独更新当前菜品的选中样式
        inCart ? dishItem.classList.add('in-cart') : dishItem.classList.remove('in-cart');
        // 单独更新当前菜品的加减按钮
        if (inCart) {
            controlsDiv.innerHTML = `
                <button class="control-btn minus" data-action="minus" data-id="${dishId}">-</button>
                <span class="dish-count">${inCart}</span>
                <button class="control-btn plus" data-action="plus" data-id="${dishId}">+</button>
            `;
        } else {
            controlsDiv.innerHTML = `<button class="control-btn plus" data-action="plus" data-id="${dishId}">+</button>`;
        }
    });
}

// 渲染购物车详情 - 按dishId精准展示
function renderCartDetail() {
    const cartDetailList = document.getElementById('cartDetailList');
    const cartItems = Object.entries(state.cart).map(([dishId, count]) => {
        const dish = state.dishes.find(d => d.id === dishId);
        return dish ? { ...dish, count } : null;
    }).filter(Boolean);

    if (cartItems.length === 0) {
        cartDetailList.innerHTML = '<div style="text-align:center;padding:40px;color:#999;">购物车是空的，快来添加菜品吧～</div>';
        return;
    }

    cartDetailList.innerHTML = cartItems.map(item => `
        <div class="cart-item">
            <span class="cart-item-name">${item.dishName}</span>
            <span class="cart-item-price">¥${formatPrice(item.price).toFixed(2)}</span>
            <div class="dish-controls">
                <button class="control-btn minus" data-action="minus" data-id="${item.id}">-</button>
                <span class="dish-count">${item.count}</span>
                <button class="control-btn plus" data-action="plus" data-id="${item.id}">+</button>
            </div>
        </div>
    `).join('');
}

// 更新菜品数量 - 核心：dishId全程唯一，操作仅影响当前菜品
function updateDishCount(dishId, action) {
    console.log('=== updateDishCount ===');
    console.log('dishId:', dishId, 'type:', typeof dishId);
    console.log('action:', action);
    console.log('购物车 before:', JSON.stringify(state.cart));
    
    if (action === 'plus') {
        state.cart[dishId] = (state.cart[dishId] || 0) + 1;
        // 首次加购提示
        if (Object.keys(state.cart).length === 1 && state.cart[dishId] === 1) showCartTip();
    } else if (action === 'minus') {
        state.cart[dishId] > 1 ? state.cart[dishId]-- : delete state.cart[dishId];
    }
    
    console.log('购物车 after:', JSON.stringify(state.cart));
    console.log('购物车键:', Object.keys(state.cart));
    console.log('购物车值:', Object.values(state.cart));
    
    updateCart(); // 仅更新当前菜品相关状态
}

// 购物车加购提示
function showCartTip() {
    const tip = document.getElementById('cartTip');
    if (tip) {
        tip.classList.add('show');
        setTimeout(() => tip.classList.remove('show'), 3000);
    }
}

// 显示菜品详情 - 按dishId精准匹配
function showDishDetail(dishId) {
    const dish = state.dishes.find(d => d.id === dishId);
    if (!dish) return;
    state.selectedDish = dish;

    const imgUrl = dish.coverImg || 'https://picsum.photos/400/400?text=菜品详情';
    document.getElementById('dishDetailImg').src = imgUrl;
    document.getElementById('dishDetailImg').onerror = () => this.src = 'https://picsum.photos/400/400?text=菜品详情';
    document.getElementById('dishDetailName').textContent = dish.dishName;
    document.getElementById('dishDetailDesc').textContent = dish.description || '暂无描述';
    document.getElementById('dishDetailPrice').textContent = formatPrice(dish.price).toFixed(2);
    document.getElementById('dishDetailTags').innerHTML = `
        <span class="dish-tag">${dish.tasteFeature || '美味'}</span>
        <span class="dish-tag">${dish.adaptScene || '推荐'}</span>
        <span class="dish-tag">月售${dish.sales || 0}</span>
    `;

    document.getElementById('dishDetailMask').classList.add('show');
    document.getElementById('dishDetail').classList.add('show');
}

// 隐藏菜品详情
function hideDishDetail() {
    document.getElementById('dishDetailMask').classList.remove('show');
    document.getElementById('dishDetail').classList.remove('show');
}

// 切换购物车详情
function toggleCartDetail() {
    console.log('=== toggleCartDetail ===');
    console.log('state.cart:', state.cart);
    console.log('购物车键:', Object.keys(state.cart));
    console.log('购物车值:', Object.values(state.cart));
    
    const totalCount = Object.values(state.cart).reduce((sum, count) => sum + (Number(count) || 0), 0);
    console.log('总数量:', totalCount);
    
    if (totalCount === 0) {
        alert('购物车为空，无法打开～');
        return;
    }
    const mask = document.getElementById('cartMask');
    const detail = document.getElementById('cartDetail');
    mask.classList.contains('show') ? (mask.classList.remove('show'), detail.classList.remove('show')) : (mask.classList.add('show'), detail.classList.add('show'));
}

// 清空购物车
function clearCart() {
    if (confirm('确定要清空购物车吗？清空后将恢复为空～')) {
        state.cart = {};
        updateCart();
        toggleCartDetail();
    }
}

// 结算功能 - 先显示二维码，支付成功后创建订单
async function checkout() {
    const totalPrice = Object.entries(state.cart).reduce((sum, [dishId, count]) => {
        const dish = state.dishes.find(d => d.id === dishId);
        return sum + (dish ? formatPrice(dish.price) * (Number(count) || 0) : 0);
    }, 0);

    // 取消起送门槛检查，只要有商品就可以结算
    if (totalPrice <= 0) {
        alert('购物车是空的，请先添加商品～');
        return;
    }

    // 准备订单数据（暂存，支付成功后再提交）
    const orderData = {
        items: Object.entries(state.cart).map(([dishId, quantity]) => ({
            dishId: dishId,
            quantity: quantity
        })),
        totalAmount: totalPrice,
        deliveryFee: 0,
        finalAmount: totalPrice,
        remark: ''
    };

    // 直接显示支付二维码
    showPaymentQRCode(orderData);
}

// 显示支付二维码
function showPaymentQRCode(orderData) {
    // 生成临时支付单号用于验证
    const paymentId = 'PAY' + Date.now();
    
    // 显示订单信息
    document.getElementById('payOrderNumber').textContent = paymentId;
    document.getElementById('payAmount').textContent = `¥${orderData.finalAmount.toFixed(2)}`;

    // 设置二维码图片
    const qrcodeImage = document.getElementById('qrcodeImage');
    qrcodeImage.src = PAYMENT_QRCODE_IMAGE;
    qrcodeImage.onerror = function() {
        this.src = 'https://via.placeholder.com/200x200/4caf50/ffffff?text=请添加支付二维码';
    };

    // 显示支付弹窗
    document.getElementById('paymentMask').classList.add('show');
    document.getElementById('paymentModal').classList.add('show');

    // 开始轮询支付状态（传入支付单号和订单数据）
    startPaymentPolling(paymentId, orderData);
}

// 轮询支付状态
let paymentPollingTimer = null;
let pollingCount = 0;
const MAX_POLLING_COUNT = 60; // 最多轮询60次（2分钟）

function startPaymentPolling(paymentId, orderData) {
    if (paymentPollingTimer) clearInterval(paymentPollingTimer);
    
    pollingCount = 0;
    
    // 每2秒轮询一次支付状态
    paymentPollingTimer = setInterval(async () => {
        pollingCount++;
        
        // 超时处理
        if (pollingCount > MAX_POLLING_COUNT) {
            stopPaymentPolling();
            showPaymentFailure('支付超时，请重新下单');
            return;
        }
        
        try {
            // 调用后端验证支付状态
            const response = await fetch(`${API_BASE_URL}/payment/verify?paymentId=${paymentId}`);
            const result = await response.json();
            
            if (result.code === 200 && result.data.paid) {
                // 支付成功，停止轮询
                stopPaymentPolling();
                
                // 创建订单
                await createOrderAfterPayment(orderData);
            } else if (result.code === 200 && result.data.failed) {
                // 支付失败
                stopPaymentPolling();
                showPaymentFailure('支付失败，请重试');
            }
            // 如果是待支付状态，继续轮询
        } catch (error) {
            console.error('验证支付状态失败:', error);
        }
    }, 2000);
}

// 支付成功后创建订单
async function createOrderAfterPayment(orderData) {
    try {
        const response = await fetch(`${API_BASE_URL}/orders`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(orderData)
        });
        const result = await response.json();
        
        if (result.code === 200) {
            showPaymentSuccess();
        } else {
            showPaymentFailure('订单创建失败: ' + result.message);
        }
    } catch (error) {
        console.error('创建订单失败:', error);
        showPaymentFailure('订单创建失败，请联系客服');
    }
}

function stopPaymentPolling() {
    if (paymentPollingTimer) {
        clearInterval(paymentPollingTimer);
        paymentPollingTimer = null;
    }
    pollingCount = 0;
}

// 显示支付失败
function showPaymentFailure(message) {
    document.getElementById('paymentStatus').innerHTML = `
        <div class="status-failure show">
            <div class="failure-icon">✗</div>
            <p>${message}</p>
        </div>
    `;
    
    setTimeout(() => {
        closePaymentModal();
    }, 3000);
}

function showPaymentSuccess() {
    document.getElementById('paymentStatus').innerHTML = `
        <div class="status-success show">
            <div class="success-icon">✓</div>
            <p>支付成功！</p>
        </div>
    `;

    setTimeout(() => {
        closePaymentModal();
        state.cart = {};
        updateCart();
        
        const mask = document.getElementById('cartMask');
        const detail = document.getElementById('cartDetail');
        mask.classList.remove('show');
        detail.classList.remove('show');

        alert('支付成功！我们将尽快为您配送～');
    }, 2000);
}

function closePaymentModal() {
    stopPaymentPolling();
    document.getElementById('paymentMask').classList.remove('show');
    document.getElementById('paymentModal').classList.remove('show');
    
    document.getElementById('paymentStatus').innerHTML = `
        <div class="status-checking">
            <div class="loading-spinner"></div>
            <p>等待支付中...</p>
        </div>
    `;
}

// 事件绑定 - 核心：事件委托精准获取当前dishId，不混淆
function bindEvents() {
    // 分类切换
    document.getElementById('categoryList').addEventListener('click', (e) => {
        const item = e.target.closest('.category-item');
        if (item) {
            const categoryId = item.dataset.id;
            state.currentCategory = categoryId;
            console.log('=== 分类切换 ===');
            console.log('目标分类 ID:', categoryId);

            renderCategories();
            // 【补充】分类切换时建议重新渲染菜品（确保菜品区域和分类同步）
            renderDishes();

            // 使用 requestAnimationFrame 确保 DOM 完全更新（双重帧足够等待渲染）
            requestAnimationFrame(() => {
                requestAnimationFrame(() => {
                    // 错误1修复：拼接正确的分类区域ID → category-xxx
                    const section = document.getElementById(`category-${categoryId}`);
                    // 错误2修复：修正滚动容器类名 → .dish-container（和渲染一致）
                    const container = document.querySelector('.dish-container');

                    console.log('分类区域元素:', section);
                    console.log('滚动容器:', container);

                    if (section && container) {
                        section.scrollIntoView({
                            behavior: 'smooth',
                            block: 'start' // 贴顶显示，体验更好
                        });
                        console.log('滚动成功：已定位到分类 →', `category-${categoryId}`);
                    } else {
                        // 分情况提示错误，方便排查
                        if (!section) {
                            console.warn('滚动失败：未找到分类区域元素，可能该分类无菜品', `ID: category-${categoryId}`);
                        }
                        if (!container) {
                            console.error('滚动失败：未找到菜品滚动容器，请检查类名是否为 .dish-container');
                        }
                    }
                });
            });
        }
    });

    // 以下是你原有的其他事件逻辑（菜品操作、购物车、详情等），保留不变即可
    // 菜品操作 - 精准获取当前点击按钮的dishId
    document.getElementById('dishContainer').addEventListener('click', (e) => {
        const btn = e.target.closest('.control-btn');
        if (btn) {
            e.stopPropagation();
            const dishId = btn.dataset.id;
            const action = btn.dataset.action;
            updateDishCount(dishId, action);
            return;
        }
        // 菜品详情
        const dishItem = e.target.closest('.dish-item');
        dishItem && showDishDetail(dishItem.dataset.id);
    });

    // 购物车图标
    document.getElementById('cartIcon').addEventListener('click', toggleCartDetail);
    // 购物车遮罩
    document.getElementById('cartMask').addEventListener('click', toggleCartDetail);
    // 购物车内部操作
    document.getElementById('cartDetailList').addEventListener('click', (e) => {
        const btn = e.target.closest('.control-btn');
        btn && updateDishCount(btn.dataset.id, btn.dataset.action);
    });

    // 清空购物车
    document.getElementById('clearCart').addEventListener('click', (e) => {
        e.stopPropagation();
        clearCart();
    });
    // 结算按钮
    document.getElementById('checkoutBtn').addEventListener('click', (e) => {
        e.stopPropagation();
        checkout();
    });

    // 菜品详情操作
    document.getElementById('addToCartBtn').addEventListener('click', () => {
        state.selectedDish && (updateDishCount(state.selectedDish.id, 'plus'), hideDishDetail());
    });
    document.getElementById('closeDetail').addEventListener('click', hideDishDetail);
    document.getElementById('dishDetailMask').addEventListener('click', hideDishDetail);
    document.getElementById('dishDetail').addEventListener('click', (e) => e.stopPropagation());
    
    // 支付弹窗事件
    document.getElementById('closePayment').addEventListener('click', closePaymentModal);
    document.getElementById('paymentMask').addEventListener('click', closePaymentModal);
    document.getElementById('paymentModal').addEventListener('click', (e) => e.stopPropagation());
}

// 页面加载完成初始化
document.addEventListener('DOMContentLoaded', init);