package service

import (
	"encoding/json"
	"log"

	"xy_sh/internal/biz"
	"xy_sh/internal/config"
	"xy_sh/internal/entities"
	"xy_sh/pkg/crypto"

	"github.com/gofiber/fiber/v2"
)

// RegisterRoutes 注册所有路由
func RegisterRoutes(app *fiber.App, cfg *config.Config) {
	b := biz.NewBiz()

	// 接口1：卡券/直充权益下单
	app.Post("/api/order/create", handleWithDecrypt(cfg, b, func(reqBytes []byte) (interface{}, error) {
		var bizReq entities.OrderCreateBizReq
		if err := json.Unmarshal(reqBytes, &bizReq); err != nil {
			return nil, err
		}
		return b.CreateOrder(&bizReq)
	}))

	// 接口2：卡券/直充/微信立减金订单查询
	app.Post("/api/order/query", handleWithDecrypt(cfg, b, func(reqBytes []byte) (interface{}, error) {
		var bizReq entities.OrderQueryBizReq
		if err := json.Unmarshal(reqBytes, &bizReq); err != nil {
			return nil, err
		}
		return b.QueryOrder(&bizReq)
	}))

	// 接口3：微信立减金订单充值
	app.Post("/api/order/recharge", handleWithDecrypt(cfg, b, func(reqBytes []byte) (interface{}, error) {
		var bizReq entities.WechatRechargeBizReq
		if err := json.Unmarshal(reqBytes, &bizReq); err != nil {
			return nil, err
		}
		return b.WechatRecharge(&bizReq)
	}))

	// 接口4：卡券/直充/微信立减金充值结果通知接口（接收供应商回调）
	app.Post("/api/callback/notify", handleCallback(cfg, b))
}

// handleWithDecrypt 通用处理：验证签名 -> 解密 -> 执行业务 -> 加密响应
func handleWithDecrypt(cfg *config.Config, b biz.Biz, handler func([]byte) (interface{}, error)) fiber.Handler {
	return func(c *fiber.Ctx) error {
		// 1. 验证签名
		timestamp := c.Get("timestamp")
		sign := c.Get("sign")
		if timestamp == "" || sign == "" {
			return c.JSON(entities.ApiResponse{
				Code: -1,
				Msg:  "缺少timestamp或sign",
			})
		}

		// 2. 获取加密数据
		var reqBody struct {
			EncryptedData string `json:"encryptedData"`
		}
		if err := c.BodyParser(&reqBody); err != nil {
			return c.JSON(entities.ApiResponse{
				Code: -1,
				Msg:  "请求体解析失败",
			})
		}

		// 3. 验证SM3签名：sign = SM3(salt + timestamp + encryptedData)
		expectedSign := crypto.SM3WithSalt(cfg.SM3Salt, timestamp+reqBody.EncryptedData)
		if expectedSign != sign {
			log.Printf("签名验证失败: expected=%s, got=%s", expectedSign, sign)
			return c.JSON(entities.ApiResponse{
				Code: -1,
				Msg:  "签名验证失败",
			})
		}

		// 4. SM4解密业务数据
		bizData, err := crypto.SM4ECBDecrypt(reqBody.EncryptedData, cfg.SM4Key)
		if err != nil {
			log.Printf("SM4解密失败: %v", err)
			return c.JSON(entities.ApiResponse{
				Code: -1,
				Msg:  "数据解密失败",
			})
		}

		// 5. 执行业务逻辑
		result, err := handler(bizData)
		if err != nil {
			log.Printf("业务处理失败: %v", err)
			return c.JSON(entities.ApiResponse{
				Code: -1,
				Msg:  err.Error(),
			})
		}

		// 6. 加密响应数据
		respBytes, err := json.Marshal(result)
		if err != nil {
			return c.JSON(entities.ApiResponse{
				Code: -1,
				Msg:  "响应序列化失败",
			})
		}

		encryptedResp, err := crypto.SM4ECBEncrypt(respBytes, cfg.SM4Key)
		if err != nil {
			return c.JSON(entities.ApiResponse{
				Code: -1,
				Msg:  "响应加密失败",
			})
		}

		return c.JSON(entities.ApiResponse{
			Code: 0,
			Msg:  "请求成功",
			Data: encryptedResp,
		})
	}
}

// handleCallback 处理供应商回调通知
func handleCallback(cfg *config.Config, b biz.Biz) fiber.Handler {
	return func(c *fiber.Ctx) error {
		// 1. 验证签名
		timestamp := c.Get("timestamp")
		sign := c.Get("sign")
		if timestamp == "" || sign == "" {
			return c.Status(400).SendString("missing auth headers")
		}

		// 2. 获取加密数据
		var reqBody struct {
			EncryptedData string `json:"encryptedData"`
		}
		if err := c.BodyParser(&reqBody); err != nil {
			return c.Status(400).SendString("invalid body")
		}

		// 3. 验证SM3签名
		expectedSign := crypto.SM3WithSalt(cfg.SM3Salt, timestamp+reqBody.EncryptedData)
		if expectedSign != sign {
			log.Printf("回调签名验证失败: expected=%s, got=%s", expectedSign, sign)
			return c.Status(400).SendString("sign verification failed")
		}

		// 4. SM4解密业务数据
		bizData, err := crypto.SM4ECBDecrypt(reqBody.EncryptedData, cfg.SM4Key)
		if err != nil {
			log.Printf("回调数据SM4解密失败: %v", err)
			return c.Status(400).SendString("decrypt failed")
		}

		// 5. 解析回调业务参数
		var callbackReq entities.CallbackNotifyBizReq
		if err := json.Unmarshal(bizData, &callbackReq); err != nil {
			log.Printf("回调数据解析失败: %v", err)
			return c.Status(400).SendString("parse failed")
		}

		// 6. 处理回调业务
		if err := b.ProcessCallback(&callbackReq); err != nil {
			log.Printf("回调处理失败: %v", err)
			return c.Status(500).SendString("process failed")
		}

		// 7. 返回成功（必须返回200且内容为ok）
		return c.Status(200).SendString("ok")
	}
}