package handlers

import (
	"encoding/json"
	"strconv"
	"time"
	"tyapi-server/internal/application/api"
	"tyapi-server/internal/application/api/commands"
	"tyapi-server/internal/application/api/dto"
	"tyapi-server/internal/shared/crypto"
	"tyapi-server/internal/shared/interfaces"

	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
)

// ApiHandler API调用HTTP处理器
type ApiHandler struct {
	appService      api.ApiApplicationService
	responseBuilder interfaces.ResponseBuilder
	validator       interfaces.RequestValidator
	logger          *zap.Logger
}

// NewApiHandler 创建API调用HTTP处理器
func NewApiHandler(
	appService api.ApiApplicationService,
	responseBuilder interfaces.ResponseBuilder,
	validator interfaces.RequestValidator,
	logger *zap.Logger,
) *ApiHandler {
	return &ApiHandler{
		appService:      appService,
		responseBuilder: responseBuilder,
		validator:       validator,
		logger:          logger,
	}
}

// HandleApiCall 统一API调用入口
// @Summary API调用
// @Description 统一API调用入口，参数加密传输
// @Tags API调用
// @Accept json
// @Produce json
// @Param request body commands.ApiCallCommand true "API调用请求"
// @Success 200 {object} dto.ApiCallResponse "调用成功"
// @Failure 400 {object} dto.ApiCallResponse "请求参数错误"
// @Failure 401 {object} dto.ApiCallResponse "未授权"
// @Failure 429 {object} dto.ApiCallResponse "请求过于频繁"
// @Failure 500 {object} dto.ApiCallResponse "服务器内部错误"
// @Router /api/v1/:api_name [post]
func (h *ApiHandler) HandleApiCall(c *gin.Context) {
	// 1. 基础参数校验
	accessId := c.GetHeader("Access-Id")
	if accessId == "" {
		response := dto.NewErrorResponse(1005, "缺少Access-Id", "")
		c.JSON(200, response)
		return
	}

	// 2. 绑定和校验请求参数
	var cmd commands.ApiCallCommand
	cmd.ClientIP = c.ClientIP()
	cmd.AccessId = accessId
	cmd.ApiName = c.Param("api_name")
	if err := h.validator.BindAndValidate(c, &cmd); err != nil {
		response := dto.NewErrorResponse(1003, "请求参数结构不正确", "")
		c.JSON(200, response)
		return
	}

	// 3. 调用应用服务
	transactionId, encryptedResp, err := h.appService.CallApi(c.Request.Context(), &cmd)
	if err != nil {
		// 根据错误类型返回对应的错误码
		errorCode := api.GetErrorCode(err)
		response := dto.NewErrorResponse(errorCode, err.Error(), transactionId)
		c.JSON(200, response) // API调用接口统一返回200状态码
		return
	}

	// 4. 返回成功响应
	response := dto.NewSuccessResponse(transactionId, encryptedResp)
	c.JSON(200, response)
}

// GetUserApiKeys 获取用户API密钥
func (h *ApiHandler) GetUserApiKeys(c *gin.Context) {
	userID := h.getCurrentUserID(c)
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	result, err := h.appService.GetUserApiKeys(c.Request.Context(), userID)
	if err != nil {
		h.logger.Error("获取用户API密钥失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, result, "获取API密钥成功")
}

// GetUserWhiteList 获取用户白名单列表
func (h *ApiHandler) GetUserWhiteList(c *gin.Context) {
	userID := h.getCurrentUserID(c)
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	result, err := h.appService.GetUserWhiteList(c.Request.Context(), userID)
	if err != nil {
		h.logger.Error("获取用户白名单失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, result, "获取白名单成功")
}

// AddWhiteListIP 添加白名单IP
func (h *ApiHandler) AddWhiteListIP(c *gin.Context) {
	userID := h.getCurrentUserID(c)
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	var req dto.WhiteListRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		h.responseBuilder.BadRequest(c, "请求参数错误")
		return
	}

	err := h.appService.AddWhiteListIP(c.Request.Context(), userID, req.IPAddress)
	if err != nil {
		h.logger.Error("添加白名单IP失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, nil, "添加白名单IP成功")
}

// DeleteWhiteListIP 删除白名单IP
func (h *ApiHandler) DeleteWhiteListIP(c *gin.Context) {
	userID := h.getCurrentUserID(c)
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	ipAddress := c.Param("ip")
	if ipAddress == "" {
		h.responseBuilder.BadRequest(c, "IP地址不能为空")
		return
	}

	err := h.appService.DeleteWhiteListIP(c.Request.Context(), userID, ipAddress)
	if err != nil {
		h.logger.Error("删除白名单IP失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, nil, "删除白名单IP成功")
}

// EncryptParams 加密参数接口（用于前端调试）
// @Summary 加密参数
// @Description 用于前端调试时加密API调用参数
// @Tags API调试
// @Accept json
// @Produce json
// @Param request body commands.EncryptCommand true "加密请求"
// @Success 200 {object} dto.EncryptResponse "加密成功"
// @Failure 400 {object} dto.EncryptResponse "请求参数错误"
// @Failure 401 {object} dto.EncryptResponse "未授权"
// @Router /api/v1/encrypt [post]
func (h *ApiHandler) EncryptParams(c *gin.Context) {
	userID := h.getCurrentUserID(c)
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	var cmd commands.EncryptCommand
	if err := h.validator.BindAndValidate(c, &cmd); err != nil {
		h.responseBuilder.BadRequest(c, "请求参数错误")
		return
	}

	// 获取用户的SecretKey
	apiKeys, err := h.appService.GetUserApiKeys(c.Request.Context(), userID)
	if err != nil {
		h.logger.Error("获取用户API密钥失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, "获取API密钥失败")
		return
	}

	// 将JSON对象转换为字节数组
	jsonData, err := json.Marshal(cmd.Data)
	if err != nil {
		h.logger.Error("序列化参数失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, "参数序列化失败")
		return
	}

	// 加密参数
	encryptedData, err := crypto.AesEncrypt(jsonData, apiKeys.SecretKey)
	if err != nil {
		h.logger.Error("加密参数失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, "加密参数失败")
		return
	}

	response := dto.EncryptResponse{
		EncryptedData: encryptedData,
	}
	h.responseBuilder.Success(c, response, "加密成功")
}

// getCurrentUserID 获取当前用户ID
func (h *ApiHandler) getCurrentUserID(c *gin.Context) string {
	if userID, exists := c.Get("user_id"); exists {
		if id, ok := userID.(string); ok {
			return id
		}
	}
	return ""
}

// GetUserApiCalls 获取用户API调用记录
// @Summary 获取用户API调用记录
// @Description 获取当前用户的API调用记录列表，支持分页和筛选
// @Tags API管理
// @Accept json
// @Produce json
// @Security Bearer
// @Param page query int false "页码" default(1)
// @Param page_size query int false "每页数量" default(10)
// @Param start_time query string false "开始时间 (格式: 2006-01-02 15:04:05)"
// @Param end_time query string false "结束时间 (格式: 2006-01-02 15:04:05)"
// @Param transaction_id query string false "交易ID"
// @Param product_name query string false "产品名称"
// @Param status query string false "状态 (pending/success/failed)"
// @Success 200 {object} dto.ApiCallListResponse "获取成功"
// @Failure 400 {object} map[string]interface{} "请求参数错误"
// @Failure 401 {object} map[string]interface{} "未认证"
// @Failure 500 {object} map[string]interface{} "服务器内部错误"
// @Router /api/v1/my/api-calls [get]
func (h *ApiHandler) GetUserApiCalls(c *gin.Context) {
	userID := h.getCurrentUserID(c)
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	// 解析查询参数
	page := h.getIntQuery(c, "page", 1)
	pageSize := h.getIntQuery(c, "page_size", 10)

	// 构建筛选条件
	filters := make(map[string]interface{})

	// 时间范围筛选
	if startTime := c.Query("start_time"); startTime != "" {
		if t, err := time.Parse("2006-01-02 15:04:05", startTime); err == nil {
			filters["start_time"] = t
		}
	}
	if endTime := c.Query("end_time"); endTime != "" {
		if t, err := time.Parse("2006-01-02 15:04:05", endTime); err == nil {
			filters["end_time"] = t
		}
	}

	// 交易ID筛选
	if transactionId := c.Query("transaction_id"); transactionId != "" {
		filters["transaction_id"] = transactionId
	}
	
	// 产品名称筛选
	if productName := c.Query("product_name"); productName != "" {
		filters["product_name"] = productName
	}
	
	// 状态筛选
	if status := c.Query("status"); status != "" {
		filters["status"] = status
	}

	// 构建分页选项
	options := interfaces.ListOptions{
		Page:     page,
		PageSize: pageSize,
		Sort:     "created_at",
		Order:    "desc",
	}

	result, err := h.appService.GetUserApiCalls(c.Request.Context(), userID, filters, options)
	if err != nil {
		h.logger.Error("获取用户API调用记录失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, "获取API调用记录失败")
		return
	}

	h.responseBuilder.Success(c, result, "获取API调用记录成功")
}

// getIntQuery 获取整数查询参数
func (h *ApiHandler) getIntQuery(c *gin.Context, key string, defaultValue int) int {
	if value := c.Query(key); value != "" {
		if intValue, err := strconv.Atoi(value); err == nil && intValue > 0 {
			return intValue
		}
	}
	return defaultValue
}