import * as React from "react"
import { useForm } from "react-hook-form"
import { zodResolver } from "@hookform/resolvers/zod"
import { Dialog, DialogTrigger, DialogContent, DialogHeader, DialogTitle, DialogDescription, DialogFooter } from "@/components/ui/dialog"
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectLabel,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import { Check, ChevronsUpDown, Loader, AlertTriangle } from "lucide-react"
import { cn } from "@/lib/utils"
import { toast } from "sonner"
import { Alert, AlertDescription } from "@/components/ui/alert"

import { createRoleSchema, type CreateRoleSchema } from "../validations"
import { createRole, checkRegularEvaluationRoleExists } from "../services"
import { Textarea } from "@/components/ui/textarea"
import { Company } from "@/db/schema/companies"
import { getAllCompanies } from "@/lib/admin-users/service"
import {
  Popover,
  PopoverTrigger,
  PopoverContent,
} from "@/components/ui/popover"
import {
  Command,
  CommandInput,
  CommandList,
  CommandGroup,
  CommandItem,
  CommandEmpty,
} from "@/components/ui/command"

const domainOptions = [
  { value: "partners", label: "협력업체" },
  { value: "evcp", label: "삼성중공업" },
]

export function AddRoleDialog() {
  const [open, setOpen] = React.useState(false)
  const [isAddPending, startAddTransition] = React.useTransition()
  const [companies, setCompanies] = React.useState<Company[]>([])
  const [regularEvaluationExists, setRegularEvaluationExists] = React.useState(false)
  const [isCheckingRegularEvaluation, setIsCheckingRegularEvaluation] = React.useState(false)

  React.useEffect(() => {
    getAllCompanies().then((res) => {
      setCompanies(res)
    })
  }, [])

  // react-hook-form 세팅
  const form = useForm<CreateRoleSchema>({
    resolver: zodResolver(createRoleSchema),
    defaultValues: {
      name: "",
      domain: "evcp",
      description: "",
    },
  })

  // name 필드 watch
  const watchedName = form.watch("name")

  // "정기평가"가 포함된 이름인지 체크
  const isRegularEvaluationRole = watchedName.includes("정기평가")

  // 정기평가 role 존재 여부 체크 (debounced)
  React.useEffect(() => {
    if (!isRegularEvaluationRole) {
      setRegularEvaluationExists(false)
      return
    }

    const timeoutId = setTimeout(async () => {
      setIsCheckingRegularEvaluation(true)
      try {
        const exists = await checkRegularEvaluationRoleExists()
        setRegularEvaluationExists(exists)
      } catch (error) {
        console.error("정기평가 role 체크 실패:", error)
      } finally {
        setIsCheckingRegularEvaluation(false)
      }
    }, 500) // 500ms debounce

    return () => clearTimeout(timeoutId)
  }, [isRegularEvaluationRole, watchedName])

  async function onSubmit(data: CreateRoleSchema) {
    startAddTransition(async () => {
      const result = await createRole(data)
      if (result.error) {
        toast.error(`에러: ${result.error}`)
        return
      }
      form.reset()
      setOpen(false)
      setRegularEvaluationExists(false)
      toast.success("Role이 성공적으로 추가되었습니다")
    })
  }

  function handleDialogOpenChange(nextOpen: boolean) {
    if (!nextOpen) {
      form.reset()
      setRegularEvaluationExists(false)
    }
    setOpen(nextOpen)
  }

  const selectedDomain = form.watch("domain")
  const canSubmit = !isRegularEvaluationRole || !regularEvaluationExists

  return (
    <Dialog open={open} onOpenChange={handleDialogOpenChange}>
      <DialogTrigger asChild>
        <Button variant="default" size="sm">
          Add Role
        </Button>
      </DialogTrigger>

      <DialogContent>
        <DialogHeader>
          <DialogTitle>Create New Role</DialogTitle>
          <DialogDescription>
            새 Role 정보를 입력하고 <b>Create</b> 버튼을 누르세요.
          </DialogDescription>
        </DialogHeader>

        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)}>
            <div className="space-y-4 py-4">
              {/* 1) Role Name */}
              <FormField
                control={form.control}
                name="name"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Role Name</FormLabel>
                    <FormControl>
                      <Input
                        placeholder="e.g. admin"
                        {...field}
                      />
                    </FormControl>
                    <FormMessage />
                    
                    {/* 정기평가 관련 경고 메시지 */}
                    {isRegularEvaluationRole && (
                      <div className="mt-2">
                        {isCheckingRegularEvaluation ? (
                          <Alert>
                            <Loader className="h-4 w-4 animate-spin" />
                            <AlertDescription>
                              정기평가 role 존재 여부를 확인하고 있습니다...
                            </AlertDescription>
                          </Alert>
                        ) : regularEvaluationExists ? (
                          <Alert variant="destructive">
                            <AlertTriangle className="h-4 w-4" />
                            <AlertDescription>
                              <strong>경고:</strong> "정기평가"가 포함된 role이 이미 존재합니다. 
                              정기평가 role은 시스템에서 하나만 허용됩니다.
                            </AlertDescription>
                          </Alert>
                        ) : (
                          <Alert>
                            <Check className="h-4 w-4" />
                            <AlertDescription>
                              정기평가 role을 생성할 수 있습니다.
                            </AlertDescription>
                          </Alert>
                        )}
                      </div>
                    )}
                  </FormItem>
                )}
              />

              {/* 2) Description */}
              <FormField
                control={form.control}
                name="description"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Role Description</FormLabel>
                    <FormControl>
                      <Textarea
                        placeholder="Describe role"
                        className="resize-none"
                        {...field}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              {/* 3) Domain Select */}
              <FormField
                control={form.control}
                name="domain"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Domain</FormLabel>
                    <FormControl>
                      <Select
                        onValueChange={field.onChange}
                        value={field.value}
                      >
                        <SelectTrigger>
                          <SelectValue placeholder="Select Domain" />
                        </SelectTrigger>
                        <SelectContent>
                          {domainOptions.map((v, index) => (
                            <SelectItem key={index} value={v.value}>
                              {v.label}
                            </SelectItem>
                          ))}
                        </SelectContent>
                      </Select>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              {/* 4) companyId => domain이 partners인 경우만 노출 */}
              {selectedDomain === "partners" && (
                <FormField
                  control={form.control}
                  name="companyId"
                  render={({ field }) => {
                    const valueString = field.value ? String(field.value) : ""
                    const selectedCompany = companies.find(
                      (c) => String(c.id) === valueString
                    )
                    const selectedCompanyLabel = selectedCompany && `${selectedCompany.name} ${selectedCompany.taxID}`
                    const [popoverOpen, setPopoverOpen] = React.useState(false)

                    return (
                      <FormItem>
                        <FormLabel>Company</FormLabel>
                        <FormControl>
                          <Popover
                            open={popoverOpen}
                            onOpenChange={setPopoverOpen}
                            modal={true}
                          >
                            <PopoverTrigger asChild>
                              <Button
                                variant="outline"
                                role="combobox"
                                aria-expanded={popoverOpen}
                                className="w-full justify-between"
                              >
                                {selectedCompany
                                  ? `${selectedCompany.name} ${selectedCompany.taxID}`
                                  : "Select company..."}
                                <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
                              </Button>
                            </PopoverTrigger>

                            <PopoverContent className="w-full p-0">
                              <Command>
                                <CommandInput
                                  placeholder="Search company..."
                                  className="h-9"
                                />
                                <CommandList>
                                  <CommandEmpty>No company found.</CommandEmpty>
                                  <CommandGroup>
                                    {companies.map((comp) => {
                                      const compIdStr = String(comp.id)
                                      const label = `${comp.name}${comp.taxID}`
                                      const label2 = `${comp.name} ${comp.taxID}`
                                      return (
                                        <CommandItem
                                          key={comp.id}
                                          value={label2}
                                          onSelect={() => {
                                            field.onChange(Number(comp.id))
                                            setPopoverOpen(false)
                                          }}
                                        >
                                          {label2}
                                          <Check
                                            className={cn(
                                              "ml-auto h-4 w-4",
                                              selectedCompanyLabel === label2
                                                ? "opacity-100"
                                                : "opacity-0"
                                            )}
                                          />
                                        </CommandItem>
                                      )
                                    })}
                                  </CommandGroup>
                                </CommandList>
                              </Command>
                            </PopoverContent>
                          </Popover>
                        </FormControl>
                        <FormMessage />
                      </FormItem>
                    )
                  }}
                />
              )}
            </div>

            {/* Footer */}
            <DialogFooter>
              <Button
                type="button"
                variant="outline"
                onClick={() => setOpen(false)}
                disabled={isAddPending}
              >
                Cancel
              </Button>
              <Button
                type="submit"
                disabled={
                  form.formState.isSubmitting || 
                  isAddPending || 
                  !canSubmit ||
                  isCheckingRegularEvaluation
                }
              >
                {isAddPending && (
                  <Loader
                    className="mr-2 size-4 animate-spin"
                    aria-hidden="true"
                  />
                )}
                Create
              </Button>
            </DialogFooter>
          </form>
        </Form>
      </DialogContent>
    </Dialog>
  )
}