package controller

import (
	"electricity_bill_calc/model"
	"electricity_bill_calc/response"
	"electricity_bill_calc/security"
	"electricity_bill_calc/service"
	"electricity_bill_calc/tools"
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"github.com/jinzhu/copier"
	"github.com/shopspring/decimal"
)

func InitializeParkController(router *gin.Engine) {
	router.GET("/parks", security.EnterpriseAuthorize, listAllParksUnderSessionUser)
	router.GET("/parks/:uid", security.MustAuthenticated, listAllParksUnderSpecificUser)
	router.POST("/park", security.EnterpriseAuthorize, createNewPark)
	router.PUT("/park/:pid", security.EnterpriseAuthorize, modifyPark)
	router.GET("/park/:pid", security.EnterpriseAuthorize, fetchParkDetail)
	router.PUT("/park/:pid/enabled", security.EnterpriseAuthorize, changeParkEnableState)
	router.DELETE("/park/:pid", security.EnterpriseAuthorize, deleteSpecificPark)
}

func ensureParkBelongs(c *gin.Context, result *response.Result, requestParkId string) bool {
	userSession, err := _retreiveSession(c)
	if err != nil {
		result.Unauthorized(err.Error())
		return false
	}
	sure, err := service.ParkService.EnsurePark(userSession.Uid, requestParkId)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return false
	}
	if !sure {
		result.Unauthorized("不能访问不属于自己的园区。")
		return false
	}
	return true
}

func listAllParksUnderSessionUser(c *gin.Context) {
	result := response.NewResult(c)
	userSession, err := _retreiveSession(c)
	if err != nil {
		result.Unauthorized(err.Error())
		return
	}
	parks, err := service.ParkService.ListAllParkBelongsTo(userSession.Uid)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	result.Json(http.StatusOK, "已获取到指定用户下的园区。", gin.H{"parks": parks})
}

func listAllParksUnderSpecificUser(c *gin.Context) {
	result := response.NewResult(c)
	requestUserId := c.Param("uid")
	parks, err := service.ParkService.ListAllParkBelongsTo(requestUserId)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	result.Json(http.StatusOK, "已获取到指定用户下的园区。", gin.H{"parks": parks})
}

type _ParkInfoFormData struct {
	Name             string              `json:"name" form:"name"`
	Region           *string             `json:"region" form:"region"`
	Address          *string             `json:"address" form:"address"`
	Contact          *string             `json:"contact" form:"contact"`
	Phone            *string             `json:"phone" from:"phone"`
	Area             decimal.NullDecimal `json:"area" from:"area"`
	Capacity         decimal.NullDecimal `json:"capacity" from:"capacity"`
	TenementQuantity decimal.NullDecimal `json:"tenement" from:"tenement"`
	Category         int                 `json:"category" form:"category"`
	Submeter         int                 `json:"submeter" form:"submeter"`
}

func createNewPark(c *gin.Context) {
	result := response.NewResult(c)
	userSession, err := _retreiveSession(c)
	if err != nil {
		result.Unauthorized(err.Error())
		return
	}
	formData := new(_ParkInfoFormData)
	c.BindJSON(formData)
	newPark := new(model.Park)
	copier.Copy(newPark, formData)
	newPark.Id = uuid.New().String()
	newPark.UserId = userSession.Uid
	nameAbbr := tools.PinyinAbbr(newPark.Name)
	newPark.Abbr = &nameAbbr
	newPark.Enabled = true
	err = service.ParkService.SaveNewPark(*newPark)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	result.Created("新园区完成创建。")
}

func modifyPark(c *gin.Context) {
	result := response.NewResult(c)
	userSession, err := _retreiveSession(c)
	if err != nil {
		result.Unauthorized(err.Error())
		return
	}
	requestParkId := c.Param("pid")
	formData := new(_ParkInfoFormData)
	c.BindJSON(formData)
	park, err := service.ParkService.FetchParkDetail(requestParkId)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	if userSession.Uid != park.UserId {
		result.Unauthorized("不能修改不属于自己的园区。")
		return
	}
	copier.Copy(park, formData)
	nameAbbr := tools.PinyinAbbr(formData.Name)
	park.Abbr = &nameAbbr
	err = service.ParkService.UpdateParkInfo(park)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	result.Updated("指定园区资料已更新。")
}

func fetchParkDetail(c *gin.Context) {
	result := response.NewResult(c)
	requestParkId := c.Param("pid")
	if !ensureParkBelongs(c, result, requestParkId) {
		return
	}
	park, err := service.ParkService.FetchParkDetail(requestParkId)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	result.Json(http.StatusOK, "已经获取到指定园区的信息。", gin.H{"park": park})
}

type _ParkStateFormData struct {
	Enabled bool `json:"enabled" form:"enabled"`
}

func changeParkEnableState(c *gin.Context) {
	result := response.NewResult(c)
	userSession, err := _retreiveSession(c)
	if err != nil {
		result.Unauthorized(err.Error())
		return
	}
	requestParkId := c.Param("pid")
	if !ensureParkBelongs(c, result, requestParkId) {
		return
	}
	formData := new(_ParkStateFormData)
	c.BindJSON(formData)
	err = service.ParkService.ChangeParkState(userSession.Uid, requestParkId, formData.Enabled)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
		return
	}
	result.Updated("指定园区的可用性状态已成功更新。")
}

func deleteSpecificPark(c *gin.Context) {
	result := response.NewResult(c)
	userSession, err := _retreiveSession(c)
	if err != nil {
		result.Unauthorized(err.Error())
		return
	}
	requestParkId := c.Param("pid")
	if !ensureParkBelongs(c, result, requestParkId) {
		return
	}
	err = service.ParkService.DeletePark(userSession.Uid, requestParkId)
	if err != nil {
		result.Error(http.StatusInternalServerError, err.Error())
	}
	result.Deleted("指定园区已成功删除。")
}