// 统计页面模块

const StatsPage = {
    // 初始化
    init() {
        this.loadStats();
    },

    // 加载统计数据
    async loadStats() {
        try {
            const [dishesRes, ordersRes] = await Promise.all([
                fetch(`${API_BASE}/dishes/`),
                fetch(`${API_BASE}/orders/`)
            ]);

            const allDishes = await dishesRes.json();
            const allOrders = await ordersRes.json();

            // 计算菜品出现次数
            const dishCompletedCounts = {};
            allOrders
                .filter(o => o.status === 'completed')
                .forEach(order => {
                    (order.dishes_detail || []).forEach(dish => {
                        dishCompletedCounts[dish.id] = (dishCompletedCounts[dish.id] || 0) + 1;
                    });
                });

            AppState.setDishCompletedCounts(dishCompletedCounts);

            // 统计数据
            const totalDishes = allDishes.length;
            const completedOrders = allOrders.filter(o => o.status === 'completed').length;
            const inProgressOrders = allOrders.filter(o => o.status === 'in_progress').length;

            // 统计参与人员
            const participantCounts = {};
            allOrders.forEach(order => {
                (order.participants || []).forEach(p => {
                    participantCounts[p] = (participantCounts[p] || 0) + 1;
                });
            });
            const uniqueParticipants = Object.keys(participantCounts).length;

            // 渲染统计卡片
            this.renderStatCards({ totalDishes, completedOrders, inProgressOrders, uniqueParticipants });

            // 渲染菜品排行榜
            this.renderDishRank(allDishes, dishCompletedCounts);

        } catch (e) {
            console.error('加载统计失败:', e);
        }
    },

    // 渲染统计卡片
    renderStatCards(stats) {
        const container = document.getElementById('stats-cards');
        if (!container) return;

        container.innerHTML = `
            <div class="stat-card">
                <div class="stat-icon" style="background: linear-gradient(135deg, var(--primary-soft), #fef3c7); color: var(--primary);">
                    <i class="bi bi-book"></i>
                </div>
                <div class="stat-value">${stats.totalDishes}</div>
                <div class="stat-label">菜品总数</div>
            </div>
            <div class="stat-card">
                <div class="stat-icon" style="background: var(--secondary-soft); color: var(--secondary);">
                    <i class="bi bi-check-circle"></i>
                </div>
                <div class="stat-value">${stats.completedOrders}</div>
                <div class="stat-label">已完成聚会</div>
            </div>
            <div class="stat-card">
                <div class="stat-icon" style="background: var(--accent-soft); color: #b45309;">
                    <i class="bi bi-clock"></i>
                </div>
                <div class="stat-value">${stats.inProgressOrders}</div>
                <div class="stat-label">进行中</div>
            </div>
        `;
    },

    // 渲染菜品排行榜
    renderDishRank(dishes, counts) {
        const container = document.getElementById('dish-rank-list');
        if (!container) return;

        // 按出现次数排序
        const dishesWithCounts = dishes.map(dish => ({
            ...dish,
            orderCount: counts[dish.id] || 0
        })).filter(d => d.orderCount > 0)
          .sort((a, b) => b.orderCount - a.orderCount);

        if (dishesWithCounts.length === 0) {
            container.innerHTML = `
                <div class="empty-rank">
                    <i class="bi bi-trophy"></i>
                    <p>暂无数据</p>
                </div>
            `;
            return;
        }

        container.innerHTML = dishesWithCounts.slice(0, 10).map((dish, index) => {
            let rankClass = 'default';
            if (index === 0) rankClass = 'gold';
            else if (index === 1) rankClass = 'silver';
            else if (index === 2) rankClass = 'bronze';

            return `
                <div class="rank-item">
                    <span class="rank-number ${rankClass}">${index + 1}</span>
                    <img class="rank-img" src="${dish.cover_image || getDefaultImage()}" alt="${dish.name}">
                    <div class="rank-info">
                        <div class="rank-name">${dish.name}</div>
                        <div class="rank-count">出现 ${dish.orderCount} 次</div>
                    </div>
                </div>
            `;
        }).join('');
    }
};

// 导出
window.StatsPage = StatsPage;