package controller

import (
	"electricity_bill_calc/excel"
	"electricity_bill_calc/global"
	"electricity_bill_calc/response"
	"electricity_bill_calc/security"
	"electricity_bill_calc/service"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/samber/lo"
	"github.com/shopspring/decimal"
)

func InitializeEndUserController(router *gin.Engine) {
	router.GET("/report/:rid/submeter", security.EnterpriseAuthorize, fetchEndUserInReport)
	router.GET("/report/:rid/meter/template", downloadEndUserRegisterTemplate)
	router.POST("/report/:rid/meter/batch", security.EnterpriseAuthorize, uploadEndUserRegisterTemplate)
	router.PUT("/report/:rid/submeter/:pid/:mid", security.EnterpriseAuthorize, modifyEndUserRegisterRecord)
}

func fetchEndUserInReport(c *gin.Context) {
	result := response.NewResult(c)
	requestReportId := c.Param("rid")
	if !ensureReportBelongs(c, result, requestReportId) {
		return
	}
	keyword := c.DefaultQuery("keyword", "")
	requestPage, err := strconv.Atoi(c.DefaultQuery("page", "1"))
	if err != nil {
		result.NotAccept("查询参数[page]格式不正确。")
		return
	}
	endUsers, totalItem, err := service.EndUserService.SearchEndUserRecord(requestReportId, keyword, requestPage)
	if err != nil {
		result.NotFound(err.Error())
		return
	}
	result.Json(
		http.StatusOK,
		"已获取到符合条件的终端用户集合",
		response.NewPagedResponse(requestPage, totalItem).ToMap(),
		gin.H{"meters": endUsers},
	)
}

func downloadEndUserRegisterTemplate(c *gin.Context) {
	result := response.NewResult(c)
	requestReportId := c.Param("rid")
	users, err := service.EndUserService.AllEndUserRecord(requestReportId)
	if err != nil {
		result.NotFound(err.Error())
		return
	}
	meterType, err := service.ReportService.RetreiveParkEndUserMeterType(requestReportId)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}

	if meterType == -1 {
		result.NotFound("未能确定用户表计类型。")
		return
	}

	c.Status(http.StatusOK)
	c.Header("Content-Type", "application/octet-stream")
	c.Header("Content-Transfer-Encoding", "binary")
	c.Header("Content-Disposition", "attachment; filename=抄表记录.xlsx")

	gen := lo.Ternary[excel.ExcelTemplateGenerator](
		meterType == 0,
		excel.NewMeterNonPVExcelTemplateGenerator(),
		excel.NewMeterPVExcelTemplateGenerator(),
	)
	defer gen.Close()
	gen.WriteMeterData(users)
	gen.WriteTo(c.Writer)
}

func uploadEndUserRegisterTemplate(c *gin.Context) {
	result := response.NewResult(c)
	requestReportId := c.Param("rid")
	if !ensureReportBelongs(c, result, requestReportId) {
		return
	}
	meterType, err := service.ReportService.RetreiveParkEndUserMeterType(requestReportId)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	if meterType == -1 {
		result.NotFound("未能确定用户表计类型。")
		return
	}

	uploadedFile, err := c.FormFile("data")
	if err != nil {
		result.NotAccept("没有接收到上传的档案文件。")
		return
	}
	archiveFile, err := uploadedFile.Open()
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	if meterType == 0 {
		errs := service.EndUserService.BatchImportNonPVRegister(requestReportId, archiveFile)
		if errs.Len() > 0 {
			result.Json(http.StatusInternalServerError, "上传抄表文件存在解析错误", gin.H{"errors": errs.Errs})
			return
		}
	} else {
		errs := service.EndUserService.BatchImportPVRegister(requestReportId, archiveFile)
		if errs.Len() > 0 {
			result.Json(http.StatusInternalServerError, "上传抄表文件存在解析错误", gin.H{"errors": errs.Errs})
			return
		}
	}
	result.Json(http.StatusOK, "已经成功完成抄表记录的导入。", gin.H{"errors": make([]error, 0)})
}

type ModifyEndUserRegisterFormData struct {
	CurrentPeriodOverall  decimal.NullDecimal `json:"currentPeriodOverall" form:"currentPeriodOverall"`
	CurrentPeriodCritical decimal.NullDecimal `json:"currentPeriodCritical" form:"currentPeriodCritical"`
	CurrentPeriodPeak     decimal.NullDecimal `json:"currentPeriodPeak" form:"currentPeriodPeak"`
	CurrentPeriodValley   decimal.NullDecimal `json:"currentPeriodValley" form:"currentPeriodValley"`
	AdjustOverall         decimal.NullDecimal `json:"adjustOverall" form:"adjustOverall"`
	AdjustCritical        decimal.NullDecimal `json:"adjustCritical" form:"adjustCritical"`
	AdjustPeak            decimal.NullDecimal `json:"adjustPeak" form:"adjustPeak"`
	AdjustValley          decimal.NullDecimal `json:"adjustValley" form:"adjustValley"`
}

func modifyEndUserRegisterRecord(c *gin.Context) {
	result := response.NewResult(c)
	requestReportId := c.Param("rid")
	if !ensureReportBelongs(c, result, requestReportId) {
		return
	}
	meterType, err := service.ReportService.RetreiveParkEndUserMeterType(requestReportId)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	if meterType == -1 {
		result.NotFound("未能确定用户表计类型。")
		return
	}
	requestParkId := c.Param("pid")
	requestMeterId := c.Param("mid")
	formData := new(ModifyEndUserRegisterFormData)
	c.BindJSON(formData)
	meter, err := service.EndUserService.FetchSpecificEndUserRecord(requestReportId, requestParkId, requestMeterId)
	if err != nil {
		result.NotFound(err.Error())
		return
	}
	if formData.CurrentPeriodOverall.Valid {
		meter.CurrentPeriodOverall = formData.CurrentPeriodOverall.Decimal
	}
	if formData.CurrentPeriodCritical.Valid {
		meter.CurrentPeriodCritical = formData.CurrentPeriodCritical.Decimal
	}
	if formData.CurrentPeriodPeak.Valid {
		meter.CurrentPeriodPeak = formData.CurrentPeriodPeak.Decimal
	}
	if formData.CurrentPeriodValley.Valid {
		meter.CurrentPeriodValley = formData.CurrentPeriodValley.Decimal
	}
	if formData.AdjustOverall.Valid {
		meter.AdjustOverall = formData.AdjustOverall.Decimal
	}
	if formData.AdjustCritical.Valid {
		meter.AdjustCritical = formData.AdjustCritical.Decimal
	}
	if formData.AdjustPeak.Valid {
		meter.AdjustPeak = formData.AdjustPeak.Decimal
	}
	if formData.AdjustValley.Valid {
		meter.AdjustValley = formData.AdjustValley.Decimal
	}
	valid, err := meter.Validate()
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	if !valid {
		result.NotAccept("抄表数据合法性验证失败。")
		return
	}
	tx := global.DBConn.NewSession()
	if err = tx.Begin(); err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	defer tx.Close()
	err = service.EndUserService.UpdateEndUserRegisterRecord(tx, *meter)
	if err != nil {
		tx.Rollback()
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	err = tx.Commit()
	if err != nil {
		tx.Rollback()
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	result.Success("指定终端用户抄表记录已经更新。")
}