package handler

import (
	"net/http"
	"time"

	"github.com/gin-gonic/gin"

	"billai-server/model"
	"billai-server/repository"
)

// ManualBillInput 手动输入的账单
type ManualBillInput struct {
	Time          string  `json:"time" binding:"required"`           // 交易时间
	Category      string  `json:"category" binding:"required"`       // 交易分类
	Merchant      string  `json:"merchant" binding:"required"`       // 交易对方
	Description   string  `json:"description"`                       // 商品说明
	IncomeExpense string  `json:"income_expense" binding:"required"` // 收/支
	Amount        float64 `json:"amount" binding:"required"`         // 金额
	PayMethod     string  `json:"pay_method"`                        // 支付方式
	Status        string  `json:"status"`                            // 交易状态
	Remark        string  `json:"remark"`                            // 备注
}

// CreateManualBillsRequest 批量创建手动账单请求
type CreateManualBillsRequest struct {
	Bills []ManualBillInput `json:"bills" binding:"required,min=1"`
}

// CreateManualBillsResponse 批量创建手动账单响应
type CreateManualBillsResponse struct {
	Result  bool                   `json:"result"`
	Message string                 `json:"message,omitempty"`
	Data    *CreateManualBillsData `json:"data,omitempty"`
}

// CreateManualBillsData 批量创建手动账单数据
type CreateManualBillsData struct {
	Success    int `json:"success"`    // 成功创建数量
	Failed     int `json:"failed"`     // 失败数量
	Duplicates int `json:"duplicates"` // 重复数量
}

// CreateManualBills 批量创建手动输入的账单
func CreateManualBills(c *gin.Context) {
	var req CreateManualBillsRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, CreateManualBillsResponse{
			Result:  false,
			Message: "参数解析失败: " + err.Error(),
		})
		return
	}

	// 获取 repository
	repo := repository.GetRepository()
	if repo == nil {
		c.JSON(http.StatusInternalServerError, CreateManualBillsResponse{
			Result:  false,
			Message: "数据库未连接",
		})
		return
	}

	// 转换为 CleanedBill
	bills := make([]model.CleanedBill, 0, len(req.Bills))
	for _, input := range req.Bills {
		// 解析时间（使用本地时区，避免 UTC 时区问题）
		t, err := time.ParseInLocation("2006-01-02 15:04:05", input.Time, time.Local)
		if err != nil {
			// 尝试另一种格式
			t, err = time.ParseInLocation("2006-01-02T15:04:05Z07:00", input.Time, time.Local)
			if err != nil {
				c.JSON(http.StatusBadRequest, CreateManualBillsResponse{
					Result:  false,
					Message: "时间格式错误: " + input.Time,
				})
				return
			}
		}

		// 设置默认值
		status := input.Status
		if status == "" {
			status = "交易成功"
		}

		bill := model.CleanedBill{
			BillType:        "manual",
			TransactionID:   "", // 手动账单不设置交易ID
			MerchantOrderNo: "",
			Time:            model.LocalTime(t),
			Category:        input.Category,
			Merchant:        input.Merchant,
			Description:     input.Description,
			IncomeExpense:   input.IncomeExpense,
			Amount:          input.Amount,
			PayMethod:       input.PayMethod,
			Status:          status,
			Remark:          input.Remark,
			ReviewLevel:     "", // 手动账单不需要复核
			CreatedAt:       time.Now(),
			UpdatedAt:       time.Now(),
			SourceFile:      "manual_input",
			UploadBatch:     time.Now().Format("20060102_150405"),
		}

		bills = append(bills, bill)
	}

	// 保存账单（带去重）
	saved, duplicates, err := repo.SaveCleanedBills(bills)
	if err != nil {
		c.JSON(http.StatusInternalServerError, CreateManualBillsResponse{
			Result:  false,
			Message: "保存失败: " + err.Error(),
		})
		return
	}

	failed := len(bills) - saved - duplicates

	c.JSON(http.StatusOK, CreateManualBillsResponse{
		Result:  true,
		Message: "创建成功",
		Data: &CreateManualBillsData{
			Success:    saved,
			Failed:     failed,
			Duplicates: duplicates,
		},
	})
}