/**
 * 支付工具类
 * 处理扫码支付相关的业务逻辑
 */

class PaymentService {
	constructor() {
		this.baseUrl = process.env.VUE_APP_API_BASE_URL || 'https://api.example.com';
	}

	/**
	 * 创建支付订单
	 * @param {Object} orderData 订单数据
	 * @param {number} orderData.amount 支付金额
	 * @param {string} orderData.paymentMethod 支付方式
	 * @param {string} orderData.orderId 订单ID
	 * @param {string} orderData.description 订单描述
	 */
	async createPaymentOrder(orderData) {
		try {
			const response = await uni.request({
				url: `${this.baseUrl}/api/payment/create`,
				method: 'POST',
				data: {
					amount: orderData.amount,
					paymentMethod: orderData.paymentMethod,
					orderId: orderData.orderId,
					description: orderData.description,
					timestamp: Date.now()
				},
				header: {
					'Content-Type': 'application/json',
					'Authorization': `Bearer ${this.getToken()}`
				}
			});

			if (response.statusCode === 200 && response.data.success) {
				return {
					success: true,
					data: response.data.data,
					message: '订单创建成功'
				};
			} else {
				throw new Error(response.data.message || '订单创建失败');
			}
		} catch (error) {
			console.error('创建支付订单失败:', error);
			return {
				success: false,
				message: error.message || '网络错误，请重试'
			};
		}
	}

	/**
	 * 发起支付
	 * @param {Object} paymentData 支付数据
	 * @param {string} paymentData.orderId 订单ID
	 * @param {string} paymentData.paymentMethod 支付方式
	 */
	async requestPayment(paymentData) {
		try {
			// 只支持支付宝支付
			if (paymentData.paymentMethod === 'alipay') {
				return await this.alipayPay(paymentData);
			} else {
				throw new Error('不支持的支付方式');
			}
		} catch (error) {
			console.error('支付请求失败:', error);
			return {
				success: false,
				message: error.message || '支付失败，请重试'
			};
		}
	}

	/**
	 * 支付宝支付
	 * @param {Object} paymentData 支付数据
	 */
	async alipayPay(paymentData) {
		return new Promise((resolve) => {
			// 模拟支付宝支付流程
			uni.showLoading({
				title: '正在调起支付宝...'
			});

			setTimeout(() => {
				uni.hideLoading();
				
				// 模拟支付结果（实际项目中需要调用真实的支付宝API）
				const success = Math.random() > 0.1; // 90%成功率
				
				if (success) {
					// 支付成功，更新订单状态
					this.updateOrderStatus(paymentData.orderId, 'paid');
					
					resolve({
						success: true,
						message: '支付成功',
						transactionId: this.generateTransactionId()
					});
				} else {
					resolve({
						success: false,
						message: '支付失败，请重试'
					});
				}
			}, 2000);
		});
	}

	/**
	 * 更新订单状态
	 * @param {string} orderId 订单ID
	 * @param {string} status 订单状态
	 */
	async updateOrderStatus(orderId, status) {
		try {
			await uni.request({
				url: `${this.baseUrl}/api/order/update-status`,
				method: 'POST',
				data: {
					orderId,
					status,
					timestamp: Date.now()
				},
				header: {
					'Content-Type': 'application/json',
					'Authorization': `Bearer ${this.getToken()}`
				}
			});
		} catch (error) {
			console.error('更新订单状态失败:', error);
		}
	}

	/**
	 * 查询支付结果
	 * @param {string} orderId 订单ID
	 */
	async queryPaymentResult(orderId) {
		try {
			const response = await uni.request({
				url: `${this.baseUrl}/api/payment/query`,
				method: 'GET',
				data: { orderId },
				header: {
					'Authorization': `Bearer ${this.getToken()}`
				}
			});

			if (response.statusCode === 200) {
				return {
					success: true,
					data: response.data.data
				};
			} else {
				throw new Error('查询支付结果失败');
			}
		} catch (error) {
			console.error('查询支付结果失败:', error);
			return {
				success: false,
				message: error.message
			};
		}
	}

	/**
	 * 获取用户token
	 */
	getToken() {
		return uni.getStorageSync('token') || '';
	}

	/**
	 * 生成交易ID
	 */
	generateTransactionId() {
		const timestamp = Date.now();
		const random = Math.floor(Math.random() * 10000);
		return `TXN${timestamp}${random}`;
	}

	/**
	 * 格式化金额
	 * @param {number} amount 金额
	 * @param {number} decimals 小数位数
	 */
	formatAmount(amount, decimals = 2) {
		return parseFloat(amount).toFixed(decimals);
	}

	/**
	 * 验证金额格式
	 * @param {string} amount 金额字符串
	 */
	validateAmount(amount) {
		const amountRegex = /^\d+(\.\d{1,2})?$/;
		const numAmount = parseFloat(amount);
		
		return amountRegex.test(amount) && numAmount > 0 && numAmount <= 999999.99;
	}

	/**
	 * 获取支付方式配置
	 */
	getPaymentMethods() {
		return [
			{
				id: 'alipay',
				name: '支付宝',
				description: '安全便捷的支付方式',
				icon: 'alipay',
				enabled: true
			}
		];
	}

	/**
	 * 处理扫码结果
	 * @param {string} scanResult 扫码结果
	 */
	parseScanResult(scanResult) {
		try {
			// 解析扫码结果，提取订单信息
			const url = new URL(scanResult);
			const params = new URLSearchParams(url.search);
			
			return {
				orderId: params.get('orderId'),
				amount: params.get('amount'),
				description: params.get('description'),
				merchantId: params.get('merchantId')
			};
		} catch (error) {
			console.error('解析扫码结果失败:', error);
			return null;
		}
	}
}

// 创建单例实例
const paymentService = new PaymentService();

export default paymentService;