"use client"

import * as React from "react"
import { zodResolver } from "@hookform/resolvers/zod"
import { Loader } from "lucide-react"
import { useForm } from "react-hook-form"
import { toast } from "sonner"
import { useSession } from "next-auth/react"

import { Button } from "@/components/ui/button"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import {
  Sheet,
  SheetClose,
  SheetContent,
  SheetDescription,
  SheetFooter,
  SheetHeader,
  SheetTitle,
} from "@/components/ui/sheet"
import { Input } from "@/components/ui/input"

import { Rfq, RfqWithItemCount } from "@/db/schema/rfq"
import { RfqType, updateRfqSchema, type UpdateRfqSchema } from "../validations"
import { modifyRfq } from "../service"
import { ProjectSelector } from "@/components/ProjectSelector"
import { type Project } from "../service"
import { BudgetaryRfqSelector } from "./BudgetaryRfqSelector"

interface UpdateRfqSheetProps
  extends React.ComponentPropsWithRef<typeof Sheet> {
  rfq: RfqWithItemCount | null
  rfqType?: RfqType;
}


interface BudgetaryRfq {
  id: number;
  rfqCode: string;
  description: string | null;
}


export function UpdateRfqSheet({ rfq,rfqType = RfqType.PURCHASE , ...props }: UpdateRfqSheetProps) {
  const [isUpdatePending, startUpdateTransition] = React.useTransition()
  const { data: session } = useSession()
  const userId = Number(session?.user?.id || 1)
  const [selectedBudgetaryRfq, setSelectedBudgetaryRfq] = React.useState<BudgetaryRfq | null>(null)

  // RHF setup
  const form = useForm<UpdateRfqSchema>({
    resolver: zodResolver(updateRfqSchema),
    defaultValues: {
      id: rfq?.rfqId ?? 0,         // PK
      rfqCode: rfq?.rfqCode ?? "",
      description: rfq?.description ?? "",
      projectId: rfq?.projectId, // 프로젝트 ID
      dueDate: rfq?.dueDate ?? undefined,    // null을 undefined로 변환
      status: rfq?.status ?? "DRAFT",
      createdBy: rfq?.createdBy ?? userId,
    },
  });

  // 프로젝트 선택 처리
  const handleProjectSelect = (project: Project) => {
    form.setValue("projectId", project.id);
  };

  async function onSubmit(input: UpdateRfqSchema) {
    startUpdateTransition(async () => {
      if (!rfq) return

      const { error } = await modifyRfq({
        ...input,
      })

      if (error) {
        toast.error(error)
        return
      }

      form.reset()
      props.onOpenChange?.(false)  // close the sheet
      toast.success("RFQ updated!")
    })
  }

  return (
    <Sheet {...props}>
      <SheetContent className="flex flex-col gap-6 sm:max-w-md">
        <SheetHeader className="text-left">
          <SheetTitle>Update RFQ</SheetTitle>
          <SheetDescription>
            Update the RFQ details and save the changes
          </SheetDescription>
        </SheetHeader>

        {/* RHF Form */}
        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)} className="flex flex-col gap-4">

            {/* Hidden or code-based id field */}
            <FormField
              control={form.control}
              name="id"
              render={({ field }) => (
                <input type="hidden" {...field} />
              )}
            />

            {/* Project Selector - 재사용 컴포넌트 사용 */}
            <FormField
              control={form.control}
              name="projectId"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Project</FormLabel>
                  <FormControl>
                    <ProjectSelector
                      selectedProjectId={field.value}
                      onProjectSelect={handleProjectSelect}
                      placeholder="프로젝트 선택..."
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />

            {/* Budgetary RFQ Selector - 구매용 RFQ 생성 시에만 표시 */}
            {rfqType === RfqType.PURCHASE && (
              <FormField
                control={form.control}
                name="parentRfqId"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Budgetary RFQ (Optional)</FormLabel>
                    <FormControl>
                      <BudgetaryRfqSelector
                        selectedRfqId={field.value as number | undefined}
                        onRfqSelect={(rfq) => {
                          setSelectedBudgetaryRfq(rfq as any);
                          form.setValue("parentRfqId", rfq?.id);
                        }}
                        placeholder="Budgetary RFQ 선택..."
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
            )}


            {/* rfqCode */}
            <FormField
              control={form.control}
              name="rfqCode"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>RFQ Code</FormLabel>
                  <FormControl>
                    <Input placeholder="e.g. RFQ-2025-001" {...field} />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />

            {/* description */}
            <FormField
              control={form.control}
              name="description"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Description</FormLabel>
                  <FormControl>
                    <Input placeholder="Description" {...field} value={field.value || ""} />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />



            {/* dueDate (type="date") */}
            <FormField
              control={form.control}
              name="dueDate"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Due Date</FormLabel>
                  <FormControl>
                    <Input
                      type="date"
                      // convert Date -> yyyy-mm-dd
                      value={field.value ? field.value.toISOString().slice(0, 10) : ""}
                      onChange={(e) => {
                        const val = e.target.value
                        field.onChange(val ? new Date(val + "T00:00:00") : undefined)
                      }}
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />

            {/* status (Select) */}
            <FormField
              control={form.control}
              name="status"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Status</FormLabel>
                  <FormControl>
                    <Select
                      onValueChange={field.onChange}
                      value={field.value ?? "DRAFT"}
                    >
                      <SelectTrigger className="capitalize">
                        <SelectValue placeholder="Select status" />
                      </SelectTrigger>
                      <SelectContent>
                        <SelectGroup>
                          {["DRAFT", "PUBLISHED", "EVALUATION", "AWARDED"].map((item) => (
                            <SelectItem key={item} value={item} className="capitalize">
                              {item}
                            </SelectItem>
                          ))}
                        </SelectGroup>
                      </SelectContent>
                    </Select>
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />

            {/* createdBy (hidden or read-only) */}
            <FormField
              control={form.control}
              name="createdBy"
              render={({ field }) => (
                <input type="hidden" {...field} />
              )}
            />

            <SheetFooter className="gap-2 pt-2 sm:space-x-0">
              <SheetClose asChild>
                <Button type="button" variant="outline">
                  Cancel
                </Button>
              </SheetClose>
              <Button disabled={isUpdatePending}>
                {isUpdatePending && (
                  <Loader className="mr-2 size-4 animate-spin" aria-hidden="true" />
                )}
                Save
              </Button>
            </SheetFooter>
          </form>
        </Form>
      </SheetContent>
    </Sheet>
  )
}