//nolint:unused
package handlers

import (
	"fmt"
	"net/http"
	"strconv"
	"time"

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

	"tyapi-server/internal/application/finance"
	"tyapi-server/internal/application/finance/dto/commands"
	"tyapi-server/internal/application/finance/dto/queries"
	_ "tyapi-server/internal/application/finance/dto/responses"
	"tyapi-server/internal/shared/interfaces"
)

// FinanceHandler 财务HTTP处理器
type FinanceHandler struct {
	appService              finance.FinanceApplicationService
	invoiceAppService       finance.InvoiceApplicationService
	adminInvoiceAppService  finance.AdminInvoiceApplicationService
	responseBuilder         interfaces.ResponseBuilder
	validator               interfaces.RequestValidator
	logger                  *zap.Logger
}

// NewFinanceHandler 创建财务HTTP处理器
func NewFinanceHandler(
	appService finance.FinanceApplicationService,
	invoiceAppService finance.InvoiceApplicationService,
	adminInvoiceAppService finance.AdminInvoiceApplicationService,
	responseBuilder interfaces.ResponseBuilder,
	validator interfaces.RequestValidator,
	logger *zap.Logger,
) *FinanceHandler {
	return &FinanceHandler{
		appService:             appService,
		invoiceAppService:      invoiceAppService,
		adminInvoiceAppService: adminInvoiceAppService,
		responseBuilder:        responseBuilder,
		validator:              validator,
		logger:                 logger,
	}
}

// GetWallet 获取钱包信息
// @Summary 获取钱包信息
// @Description 获取当前用户的钱包详细信息
// @Tags 钱包管理
// @Accept json
// @Produce json
// @Security Bearer
// @Success 200 {object} responses.WalletResponse "获取钱包信息成功"
// @Failure 401 {object} map[string]interface{} "未认证"
// @Failure 404 {object} map[string]interface{} "钱包不存在"
// @Failure 500 {object} map[string]interface{} "服务器内部错误"
// @Router /api/v1/finance/wallet [get]
func (h *FinanceHandler) GetWallet(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	query := &queries.GetWalletInfoQuery{UserID: userID}
	result, err := h.appService.GetWallet(c.Request.Context(), query)
	if err != nil {
		h.logger.Error("获取钱包信息失败",
			zap.String("user_id", userID),
			zap.Error(err),
		)
		h.responseBuilder.BadRequest(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, result, "获取钱包信息成功")
}

// GetUserWalletTransactions 获取用户钱包交易记录
// @Summary 获取用户钱包交易记录
// @Description 获取当前用户的钱包交易记录列表，支持分页和筛选
// @Tags 钱包管理
// @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 min_amount query string false "最小金额"
// @Param max_amount query string false "最大金额"
// @Success 200 {object} responses.WalletTransactionListResponse "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/finance/wallet/transactions [get]
func (h *FinanceHandler) GetUserWalletTransactions(c *gin.Context) {
	userID := c.GetString("user_id")
	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
	}

	// 金额范围筛选
	if minAmount := c.Query("min_amount"); minAmount != "" {
		filters["min_amount"] = minAmount
	}
	if maxAmount := c.Query("max_amount"); maxAmount != "" {
		filters["max_amount"] = maxAmount
	}

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

	result, err := h.appService.GetUserWalletTransactions(c.Request.Context(), userID, filters, options)
	if err != nil {
		h.logger.Error("获取用户钱包交易记录失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, "获取钱包交易记录失败")
		return
	}

	h.responseBuilder.Success(c, result, "获取钱包交易记录成功")
}

// getIntQuery 获取整数查询参数
func (h *FinanceHandler) 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
}

// HandleAlipayCallback 处理支付宝支付回调
// @Summary 支付宝支付回调
// @Description 处理支付宝异步支付通知
// @Tags 支付管理
// @Accept application/x-www-form-urlencoded
// @Produce text/plain
// @Success 200 {string} string "success"
// @Failure 400 {string} string "fail"
// @Router /api/v1/finance/alipay/callback [post]
func (h *FinanceHandler) HandleAlipayCallback(c *gin.Context) {
	// 记录回调请求信息
	h.logger.Info("收到支付宝回调请求",
		zap.String("method", c.Request.Method),
		zap.String("url", c.Request.URL.String()),
		zap.String("remote_addr", c.ClientIP()),
		zap.String("user_agent", c.GetHeader("User-Agent")),
	)

	// 通过应用服务处理支付宝回调
	err := h.appService.HandleAlipayCallback(c.Request.Context(), c.Request)
	if err != nil {
		h.logger.Error("支付宝回调处理失败", zap.Error(err))
		c.String(400, "fail")
		return
	}

	// 返回成功响应（支付宝要求返回success）
	c.String(200, "success")
}

// HandleAlipayReturn 处理支付宝同步回调
// @Summary 支付宝同步回调
// @Description 处理支付宝同步支付通知，跳转到前端成功页面
// @Tags 支付管理
// @Accept application/x-www-form-urlencoded
// @Produce text/html
// @Success 200 {string} string "支付成功页面"
// @Failure 400 {string} string "支付失败页面"
// @Router /api/v1/finance/alipay/return [get]
func (h *FinanceHandler) HandleAlipayReturn(c *gin.Context) {
	// 记录同步回调请求信息
	h.logger.Info("收到支付宝同步回调请求",
		zap.String("method", c.Request.Method),
		zap.String("url", c.Request.URL.String()),
		zap.String("remote_addr", c.ClientIP()),
		zap.String("user_agent", c.GetHeader("User-Agent")),
	)

	// 获取查询参数
	outTradeNo := c.Query("out_trade_no")
	tradeNo := c.Query("trade_no")
	totalAmount := c.Query("total_amount")

	h.logger.Info("支付宝同步回调参数",
		zap.String("out_trade_no", outTradeNo),
		zap.String("trade_no", tradeNo),
		zap.String("total_amount", totalAmount),
	)

	// 验证必要参数
	if outTradeNo == "" {
		h.logger.Error("支付宝同步回调缺少商户订单号")
		h.redirectToFailPage(c, "", "缺少商户订单号")
		return
	}

	// 通过应用服务处理同步回调，查询订单状态
	orderStatus, err := h.appService.HandleAlipayReturn(c.Request.Context(), outTradeNo)
	if err != nil {
		h.logger.Error("支付宝同步回调处理失败", 
			zap.String("out_trade_no", outTradeNo),
			zap.Error(err))
		h.redirectToFailPage(c, outTradeNo, "订单处理失败")
		return
	}

	// 根据环境确定前端域名
	frontendDomain := "https://console.tianyuanapi.com"
	if gin.Mode() == gin.DebugMode {
		frontendDomain = "http://localhost:5173"
	}

	// 根据订单状态跳转到相应页面
	switch orderStatus {
	case "TRADE_SUCCESS":
		// 支付成功，跳转到前端成功页面
		successURL := fmt.Sprintf("%s/finance/wallet/success?out_trade_no=%s&trade_no=%s&amount=%s", 
			frontendDomain, outTradeNo, tradeNo, totalAmount)
		c.Redirect(http.StatusFound, successURL)
	case "WAIT_BUYER_PAY":
		// 支付处理中，跳转到处理中页面
		h.redirectToProcessingPage(c, outTradeNo, totalAmount)
	default:
		// 支付失败或取消，跳转到前端失败页面
		h.redirectToFailPage(c, outTradeNo, orderStatus)
	}
}

// redirectToFailPage 跳转到失败页面
func (h *FinanceHandler) redirectToFailPage(c *gin.Context, outTradeNo, reason string) {
	frontendDomain := "https://console.tianyuanapi.com"
	if gin.Mode() == gin.DebugMode {
		frontendDomain = "http://localhost:5173"
	}
	
	failURL := fmt.Sprintf("%s/finance/wallet/fail?out_trade_no=%s&reason=%s", 
		frontendDomain, outTradeNo, reason)
	c.Redirect(http.StatusFound, failURL)
}

// redirectToProcessingPage 跳转到处理中页面
func (h *FinanceHandler) redirectToProcessingPage(c *gin.Context, outTradeNo, amount string) {
	frontendDomain := "https://console.tianyuanapi.com"
	if gin.Mode() == gin.DebugMode {
		frontendDomain = "http://localhost:5173"
	}
	
	processingURL := fmt.Sprintf("%s/finance/wallet/processing?out_trade_no=%s&amount=%s", 
		frontendDomain, outTradeNo, amount)
	c.Redirect(http.StatusFound, processingURL)
}

// CreateAlipayRecharge 创建支付宝充值订单
// @Summary 创建支付宝充值订单
// @Description 创建支付宝充值订单并返回支付链接
// @Tags 钱包管理
// @Accept json
// @Produce json
// @Security Bearer
// @Param request body commands.CreateAlipayRechargeCommand true "充值请求"
// @Success 200 {object} responses.AlipayRechargeOrderResponse "创建充值订单成功"
// @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/finance/wallet/alipay-recharge [post]
func (h *FinanceHandler) CreateAlipayRecharge(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	var cmd commands.CreateAlipayRechargeCommand
	cmd.UserID = userID
	if err := h.validator.BindAndValidate(c, &cmd); err != nil {
		return
	}


	// 调用应用服务进行完整的业务流程编排
	result, err := h.appService.CreateAlipayRechargeOrder(c.Request.Context(), &cmd)
	if err != nil {
		h.logger.Error("创建支付宝充值订单失败",
			zap.String("user_id", userID),
			zap.String("amount", cmd.Amount),
			zap.Error(err),
		)
		h.responseBuilder.BadRequest(c, "创建支付宝充值订单失败: "+err.Error())
		return
	}

	h.logger.Info("支付宝充值订单创建成功",
		zap.String("user_id", userID),
		zap.String("out_trade_no", result.OutTradeNo),
		zap.String("amount", cmd.Amount),
		zap.String("platform", cmd.Platform),
	)

	// 返回支付链接和订单信息
	h.responseBuilder.Success(c, result, "支付宝充值订单创建成功")
}

// TransferRecharge 管理员对公转账充值
func (h *FinanceHandler) TransferRecharge(c *gin.Context) {
	var cmd commands.TransferRechargeCommand
	if err := h.validator.BindAndValidate(c, &cmd); err != nil {
		return
	}

	if cmd.UserID == "" {
		h.responseBuilder.BadRequest(c, "缺少用户ID")
		return
	}

	result, err := h.appService.TransferRecharge(c.Request.Context(), &cmd)
	if err != nil {
		h.logger.Error("对公转账充值失败",
			zap.String("user_id", cmd.UserID),
			zap.Error(err),
		)
		h.responseBuilder.BadRequest(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, result, "对公转账充值成功")
}

// GiftRecharge 管理员赠送充值
func (h *FinanceHandler) GiftRecharge(c *gin.Context) {
	var cmd commands.GiftRechargeCommand
	if err := h.validator.BindAndValidate(c, &cmd); err != nil {
		return
	}

	if cmd.UserID == "" {
		h.responseBuilder.BadRequest(c, "缺少用户ID")
		return
	}

	result, err := h.appService.GiftRecharge(c.Request.Context(), &cmd)
	if err != nil {
		h.logger.Error("赠送充值失败",
			zap.String("user_id", cmd.UserID),
			zap.Error(err),
		)
		h.responseBuilder.BadRequest(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, result, "赠送充值成功")
}

// GetUserRechargeRecords 用户获取自己充值记录分页
func (h *FinanceHandler) GetUserRechargeRecords(c *gin.Context) {
	userID := c.GetString("user_id")
	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
		}
	}

	// 充值类型筛选
	if rechargeType := c.Query("recharge_type"); rechargeType != "" {
		filters["recharge_type"] = rechargeType
	}

	// 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.GetUserRechargeRecords(c.Request.Context(), userID, filters, options)
	if err != nil {
		h.logger.Error("获取用户充值记录失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, "获取充值记录失败")
		return
	}

	h.responseBuilder.Success(c, result, "获取充值记录成功")
}

// GetAdminRechargeRecords 管理员获取充值记录分页
func (h *FinanceHandler) GetAdminRechargeRecords(c *gin.Context) {
	// 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{})

	// 用户ID筛选
	if userID := c.Query("user_id"); userID != "" {
		filters["user_id"] = userID
	}

	// 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
		}
	}

	// 充值类型筛选
	if rechargeType := c.Query("recharge_type"); rechargeType != "" {
		filters["recharge_type"] = rechargeType
	}

	// 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.GetAdminRechargeRecords(c.Request.Context(), filters, options)
	if err != nil {
		h.logger.Error("获取充值记录失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, "获取充值记录失败")
		return
	}

	h.responseBuilder.Success(c, result, "获取充值记录成功")
}

// GetRechargeConfig 获取充值配置
// @Summary 获取充值配置
// @Description 获取当前环境的充值配置信息（最低充值金额、最高充值金额等）
// @Tags 钱包管理
// @Accept json
// @Produce json
// @Success 200 {object} responses.RechargeConfigResponse "获取充值配置成功"
// @Failure 500 {object} map[string]interface{} "服务器内部错误"
// @Router /api/v1/finance/wallet/recharge-config [get]
func (h *FinanceHandler) GetRechargeConfig(c *gin.Context) {
	result, err := h.appService.GetRechargeConfig(c.Request.Context())
	if err != nil {
		h.logger.Error("获取充值配置失败", zap.Error(err))
		h.responseBuilder.BadRequest(c, "获取充值配置失败")
		return
	}

	h.responseBuilder.Success(c, result, "获取充值配置成功")
}

// GetAlipayOrderStatus 获取支付宝订单状态
// @Summary 获取支付宝订单状态
// @Description 获取支付宝订单的当前状态，用于轮询查询
// @Tags 钱包管理
// @Accept json
// @Produce json
// @Security Bearer
// @Param out_trade_no query string true "商户订单号"
// @Success 200 {object} responses.AlipayOrderStatusResponse "获取订单状态成功"
// @Failure 400 {object} map[string]interface{} "请求参数错误"
// @Failure 401 {object} map[string]interface{} "未认证"
// @Failure 404 {object} map[string]interface{} "订单不存在"
// @Failure 500 {object} map[string]interface{} "服务器内部错误"
// @Router /api/v1/finance/wallet/alipay-order-status [get]
func (h *FinanceHandler) GetAlipayOrderStatus(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	outTradeNo := c.Query("out_trade_no")
	if outTradeNo == "" {
		h.responseBuilder.BadRequest(c, "缺少商户订单号")
		return
	}

	result, err := h.appService.GetAlipayOrderStatus(c.Request.Context(), outTradeNo)
	if err != nil {
		h.logger.Error("获取支付宝订单状态失败",
			zap.String("user_id", userID),
			zap.String("out_trade_no", outTradeNo),
			zap.Error(err),
		)
		h.responseBuilder.BadRequest(c, "获取订单状态失败: "+err.Error())
		return
	}

	h.responseBuilder.Success(c, result, "获取订单状态成功")
}

// ==================== 发票相关Handler方法 ====================

// ApplyInvoice 申请开票
// @Summary 申请开票
// @Description 用户申请开票
// @Tags 发票管理
// @Accept json
// @Produce json
// @Param request body finance.ApplyInvoiceRequest true "申请开票请求"
// @Success 200 {object} interfaces.APIResponse{data=dto.InvoiceApplicationResponse}
// @Failure 400 {object} interfaces.APIResponse
// @Failure 500 {object} interfaces.APIResponse
// @Router /api/v1/invoices/apply [post]
func (h *FinanceHandler) ApplyInvoice(c *gin.Context) {
	var req finance.ApplyInvoiceRequest
	if err := h.validator.BindAndValidate(c, &req); err != nil {
		h.responseBuilder.BadRequest(c, "请求参数错误", err)
		return
	}

	userID := c.GetString("user_id") // 从JWT中获取用户ID
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	result, err := h.invoiceAppService.ApplyInvoice(c.Request.Context(), userID, req)
	if err != nil {
		h.responseBuilder.InternalError(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, result, "申请开票成功")
}

// GetUserInvoiceInfo 获取用户发票信息
// @Summary 获取用户发票信息
// @Description 获取用户的发票信息
// @Tags 发票管理
// @Produce json
// @Success 200 {object} interfaces.APIResponse{data=dto.InvoiceInfoResponse}
// @Failure 400 {object} interfaces.APIResponse
// @Failure 500 {object} interfaces.APIResponse
// @Router /api/v1/invoices/info [get]
func (h *FinanceHandler) GetUserInvoiceInfo(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	result, err := h.invoiceAppService.GetUserInvoiceInfo(c.Request.Context(), userID)
	if err != nil {
		h.responseBuilder.InternalError(c, "获取发票信息失败")
		return
	}

	h.responseBuilder.Success(c, result, "获取发票信息成功")
}

// UpdateUserInvoiceInfo 更新用户发票信息
// @Summary 更新用户发票信息
// @Description 更新用户的发票信息
// @Tags 发票管理
// @Accept json
// @Produce json
// @Param request body finance.UpdateInvoiceInfoRequest true "更新发票信息请求"
// @Success 200 {object} interfaces.APIResponse
// @Failure 400 {object} interfaces.APIResponse
// @Failure 500 {object} interfaces.APIResponse
// @Router /api/v1/invoices/info [put]
func (h *FinanceHandler) UpdateUserInvoiceInfo(c *gin.Context) {
	var req finance.UpdateInvoiceInfoRequest
	if err := h.validator.BindAndValidate(c, &req); err != nil {
		h.responseBuilder.BadRequest(c, "请求参数错误", err)
		return
	}

	userID := c.GetString("user_id")
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	err := h.invoiceAppService.UpdateUserInvoiceInfo(c.Request.Context(), userID, req)
	if err != nil {
		h.responseBuilder.InternalError(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, nil, "更新发票信息成功")
}

// GetUserInvoiceRecords 获取用户开票记录
// @Summary 获取用户开票记录
// @Description 获取用户的开票记录列表
// @Tags 发票管理
// @Produce json
// @Param page query int false "页码" default(1)
// @Param page_size query int false "每页数量" default(10)
// @Param status query string false "状态筛选"
// @Success 200 {object} interfaces.APIResponse{data=dto.InvoiceRecordsResponse}
// @Failure 400 {object} interfaces.APIResponse
// @Failure 500 {object} interfaces.APIResponse
// @Router /api/v1/invoices/records [get]
func (h *FinanceHandler) GetUserInvoiceRecords(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "10"))
	status := c.Query("status")
	startTime := c.Query("start_time")
	endTime := c.Query("end_time")

	req := finance.GetInvoiceRecordsRequest{
		Page:      page,
		PageSize:  pageSize,
		Status:    status,
		StartTime: startTime,
		EndTime:   endTime,
	}

	result, err := h.invoiceAppService.GetUserInvoiceRecords(c.Request.Context(), userID, req)
	if err != nil {
		h.responseBuilder.InternalError(c, "获取开票记录失败")
		return
	}

	h.responseBuilder.Success(c, result, "获取开票记录成功")
}

// DownloadInvoiceFile 下载发票文件
// @Summary 下载发票文件
// @Description 下载指定发票的文件
// @Tags 发票管理
// @Produce application/octet-stream
// @Param application_id path string true "申请ID"
// @Success 200 {file} file
// @Failure 400 {object} interfaces.APIResponse
// @Failure 500 {object} interfaces.APIResponse
// @Router /api/v1/invoices/{application_id}/download [get]
func (h *FinanceHandler) DownloadInvoiceFile(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	applicationID := c.Param("application_id")
	if applicationID == "" {
		h.responseBuilder.BadRequest(c, "申请ID不能为空")
		return
	}

	result, err := h.invoiceAppService.DownloadInvoiceFile(c.Request.Context(), userID, applicationID)
	if err != nil {
		h.responseBuilder.InternalError(c, "下载发票文件失败")
		return
	}

	// 设置响应头
	c.Header("Content-Type", "application/pdf")
	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", result.FileName))
	c.Header("Content-Length", fmt.Sprintf("%d", len(result.FileContent)))

	// 直接返回文件内容
	c.Data(http.StatusOK, "application/pdf", result.FileContent)
}

// GetAvailableAmount 获取可开票金额
// @Summary 获取可开票金额
// @Description 获取用户当前可开票的金额
// @Tags 发票管理
// @Produce json
// @Success 200 {object} interfaces.APIResponse{data=dto.AvailableAmountResponse}
// @Failure 400 {object} interfaces.APIResponse
// @Failure 500 {object} interfaces.APIResponse
// @Router /api/v1/invoices/available-amount [get]
func (h *FinanceHandler) GetAvailableAmount(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		h.responseBuilder.Unauthorized(c, "用户未登录")
		return
	}

	result, err := h.invoiceAppService.GetAvailableAmount(c.Request.Context(), userID)
	if err != nil {
		h.responseBuilder.InternalError(c, "获取可开票金额失败")
		return
	}

	h.responseBuilder.Success(c, result, "获取可开票金额成功")
}

// ==================== 管理员发票相关Handler方法 ====================

// GetPendingApplications 获取发票申请列表（支持筛选）
// @Summary 获取发票申请列表
// @Description 管理员获取发票申请列表，支持状态和时间范围筛选
// @Tags 管理员-发票管理
// @Produce json
// @Param page query int false "页码" default(1)
// @Param page_size query int false "每页数量" default(10)
// @Param status query string false "状态筛选：pending/completed/rejected"
// @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)"
// @Success 200 {object} interfaces.APIResponse{data=dto.PendingApplicationsResponse}
// @Failure 400 {object} interfaces.APIResponse
// @Failure 500 {object} interfaces.APIResponse
// @Router /api/v1/admin/invoices/pending [get]
func (h *FinanceHandler) GetPendingApplications(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "10"))
	status := c.Query("status")
	startTime := c.Query("start_time")
	endTime := c.Query("end_time")

	req := finance.GetPendingApplicationsRequest{
		Page:      page,
		PageSize:  pageSize,
		Status:    status,
		StartTime: startTime,
		EndTime:   endTime,
	}

	result, err := h.adminInvoiceAppService.GetPendingApplications(c.Request.Context(), req)
	if err != nil {
		h.responseBuilder.InternalError(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, result, "获取发票申请列表成功")
}

// ApproveInvoiceApplication 通过发票申请（上传发票）
// @Summary 通过发票申请
// @Description 管理员通过发票申请并上传发票文件
// @Tags 管理员-发票管理
// @Accept multipart/form-data
// @Produce json
// @Param application_id path string true "申请ID"
// @Param file formData file true "发票文件"
// @Param admin_notes formData string false "管理员备注"
// @Success 200 {object} interfaces.APIResponse
// @Failure 400 {object} interfaces.APIResponse
// @Failure 500 {object} interfaces.APIResponse
// @Router /api/v1/admin/invoices/{application_id}/approve [post]
func (h *FinanceHandler) ApproveInvoiceApplication(c *gin.Context) {
	applicationID := c.Param("application_id")
	if applicationID == "" {
		h.responseBuilder.BadRequest(c, "申请ID不能为空")
		return
	}

	// 获取上传的文件
	file, err := c.FormFile("file")
	if err != nil {
		h.responseBuilder.BadRequest(c, "请选择要上传的发票文件")
		return
	}

	// 打开文件
	fileHandle, err := file.Open()
	if err != nil {
		h.responseBuilder.InternalError(c, "文件打开失败")
		return
	}
	defer fileHandle.Close()

	// 获取管理员备注
	adminNotes := c.PostForm("admin_notes")

	req := finance.ApproveInvoiceRequest{
		AdminNotes: adminNotes,
	}

	err = h.adminInvoiceAppService.ApproveInvoiceApplication(c.Request.Context(), applicationID, fileHandle, req)
	if err != nil {
		h.responseBuilder.InternalError(c, err.Error())
		return
	}



	h.responseBuilder.Success(c, nil, "通过发票申请成功")
}

// RejectInvoiceApplication 拒绝发票申请
// @Summary 拒绝发票申请
// @Description 管理员拒绝发票申请
// @Tags 管理员-发票管理
// @Accept json
// @Produce json
// @Param application_id path string true "申请ID"
// @Param request body finance.RejectInvoiceRequest true "拒绝申请请求"
// @Success 200 {object} interfaces.APIResponse
// @Failure 400 {object} interfaces.APIResponse
// @Failure 500 {object} interfaces.APIResponse
// @Router /api/v1/admin/invoices/{application_id}/reject [post]
func (h *FinanceHandler) RejectInvoiceApplication(c *gin.Context) {
	applicationID := c.Param("application_id")
	if applicationID == "" {
		h.responseBuilder.BadRequest(c, "申请ID不能为空")
		return
	}

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

	err := h.adminInvoiceAppService.RejectInvoiceApplication(c.Request.Context(), applicationID, req)
	if err != nil {
		h.responseBuilder.InternalError(c, err.Error())
		return
	}

	h.responseBuilder.Success(c, nil, "拒绝发票申请成功")
}

// AdminDownloadInvoiceFile 管理员下载发票文件
// @Summary 管理员下载发票文件
// @Description 管理员下载指定发票的文件
// @Tags 管理员-发票管理
// @Produce application/octet-stream
// @Param application_id path string true "申请ID"
// @Success 200 {file} file
// @Failure 400 {object} interfaces.APIResponse
// @Failure 500 {object} interfaces.APIResponse
// @Router /api/v1/admin/invoices/{application_id}/download [get]
func (h *FinanceHandler) AdminDownloadInvoiceFile(c *gin.Context) {
	applicationID := c.Param("application_id")
	if applicationID == "" {
		h.responseBuilder.BadRequest(c, "申请ID不能为空")
		return
	}

	result, err := h.adminInvoiceAppService.DownloadInvoiceFile(c.Request.Context(), applicationID)
	if err != nil {
		h.responseBuilder.InternalError(c, "下载发票文件失败")
		return
	}

	// 设置响应头
	c.Header("Content-Type", "application/pdf")
	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", result.FileName))
	c.Header("Content-Length", fmt.Sprintf("%d", len(result.FileContent)))

	// 直接返回文件内容
	c.Data(http.StatusOK, "application/pdf", result.FileContent)
}

// DebugEventSystem 调试事件系统
// @Summary 调试事件系统
// @Description 调试事件系统，用于测试事件触发和处理
// @Tags 系统调试
// @Accept json
// @Produce json
// @Security Bearer
// @Success 200 {object} map[string]interface{} "调试成功"
// @Failure 500 {object} map[string]interface{} "服务器内部错误"
// @Router /api/v1/debug/event-system [post]
func (h *FinanceHandler) DebugEventSystem(c *gin.Context) {
	h.logger.Info("🔍 请求事件系统调试信息")
	
	// 这里可以添加事件系统的状态信息
	// 暂时返回基本信息
	debugInfo := map[string]interface{}{
		"timestamp": time.Now().Format("2006-01-02 15:04:05"),
		"message": "事件系统调试端点已启用",
		"handler": "FinanceHandler",
	}
	
	h.responseBuilder.Success(c, debugInfo, "事件系统调试信息")
}