// API 调用封装
const API_BASE = '/api';

async function apiRequest(url, options = {}) {
    const res = await fetch(url, {
        ...options,
        headers: {
            'Content-Type': 'application/json',
            ...options.headers,
        },
    });

    if (!res.ok) {
        let errorMsg = `请求失败 (${res.status})`;
        try {
            const data = await res.json();
            if (data.error) errorMsg = data.error;
            else if (data.detail) errorMsg = data.detail;
        } catch {
            // response not JSON
        }
        throw new Error(errorMsg);
    }

    // 204 No Content
    if (res.status === 204) return null;
    return res.json();
}

const API = {
    // 菜品相关
    async getDishes(params = {}) {
        const query = new URLSearchParams(params).toString();
        return apiRequest(`${API_BASE}/dishes/${query ? '?' + query : ''}`);
    },

    async getDish(id) {
        return apiRequest(`${API_BASE}/dishes/${id}/`);
    },

    async createDish(data) {
        return apiRequest(`${API_BASE}/dishes/`, {
            method: 'POST',
            body: JSON.stringify(data),
        });
    },

    async updateDish(id, data) {
        return apiRequest(`${API_BASE}/dishes/${id}/`, {
            method: 'PATCH',
            body: JSON.stringify(data),
        });
    },

    async deleteDish(id) {
        return apiRequest(`${API_BASE}/dishes/${id}/`, { method: 'DELETE' });
    },

    // 分类相关
    async getCategories() {
        return apiRequest(`${API_BASE}/categories/`);
    },

    // 订单相关
    async getOrders(params = {}) {
        const query = new URLSearchParams(params).toString();
        return apiRequest(`${API_BASE}/orders/${query ? '?' + query : ''}`);
    },

    async createOrder(data) {
        return apiRequest(`${API_BASE}/orders/`, {
            method: 'POST',
            body: JSON.stringify(data),
        });
    },

    async completeOrder(id) {
        return apiRequest(`${API_BASE}/orders/${id}/complete/`, { method: 'POST' });
    },

    async deleteOrder(id) {
        return apiRequest(`${API_BASE}/orders/${id}/`, { method: 'DELETE' });
    },

    // URL解析
    async parseUrl(url) {
        return apiRequest(`${API_BASE}/parse-url/`, {
            method: 'POST',
            body: JSON.stringify({ url }),
        });
    },

    // 图片上传
    async uploadImage(file) {
        const formData = new FormData();
        formData.append('image', file);
        const res = await fetch('/upload-image/', {
            method: 'POST',
            body: formData,
        });

        if (!res.ok) {
            let errorMsg = `上传失败 (${res.status})`;
            try {
                const data = await res.json();
                if (data.error) errorMsg = data.error;
            } catch {
                // response not JSON
            }
            throw new Error(errorMsg);
        }
        return res.json();
    },
};