"use client"

import { z } from "zod"
import { zodResolver } from "@hookform/resolvers/zod"
import { useForm } from "react-hook-form"
import { useLocale, useTranslations } from "next-intl"
import { toast } from "sonner"

import { EditDangerSection } from "@/components/edit-danger-section"
import { FormSection } from "@/components/form-section"
import { StatusSwitchField } from "@/components/status-switch-field"
import { PageHeader } from "@/components/page-header"
import { Button } from "@/components/ui/button"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { Input } from "@/components/ui/input"
import { Textarea } from "@/components/ui/textarea"
import {
  useCreateFaq,
  useDeleteFaq,
  useUpdateFaq,
} from "@/hooks/api/use-faqs"
import { useRouter } from "@/i18n/navigation"
import { ApiError } from "@/lib/api/errors"
import { faqToFormValues, type FaqRecord } from "@/lib/api/faqs"

const faqSchema = z.object({
  question: z.string().min(5, "Question is required."),
  answer: z.string().min(10, "Answer is required."),
  position: z.number().int().min(0, "Position must be 0 or greater."),
  active: z.boolean(),
})

type FaqFormValues = z.infer<typeof faqSchema>

export function FaqEditor({
  mode,
  faq,
}: {
  mode: "create" | "edit"
  faq?: FaqRecord
}) {
  const locale = useLocale()
  const t = useTranslations("Faqs")
  const tCreate = useTranslations("Faqs.Create")
  const tEdit = useTranslations("Faqs.Edit")
  const tc = useTranslations("Common")
  const router = useRouter()
  const createFaq = useCreateFaq()
  const updateFaq = useUpdateFaq()
  const deleteFaq = useDeleteFaq()

  const form = useForm<FaqFormValues>({
    resolver: zodResolver(faqSchema),
    defaultValues: faqToFormValues(faq),
    values: faq ? faqToFormValues(faq) : undefined,
  })

  const isPending =
    createFaq.isPending || updateFaq.isPending || deleteFaq.isPending

  const showApiError = (e: unknown) => {
    toast.error(e instanceof ApiError ? e.message : tc("api.errorFallback"))
  }

  async function onSubmit(values: FaqFormValues) {
    const input = {
      question: values.question,
      answer: values.answer,
      position: values.position,
      active: values.active,
      locale: mode === "edit" && faq?.locale ? faq.locale : locale,
    }

    try {
      if (mode === "create") {
        await createFaq.mutateAsync(input)
        toast.success(t("toast.created"))
      } else if (faq) {
        await updateFaq.mutateAsync({ id: faq.id, ...input })
        toast.success(t("toast.updated"))
      }
      router.push("/faqs")
    } catch (e) {
      showApiError(e)
    }
  }

  async function handleDelete() {
    if (!faq) return
    try {
      await deleteFaq.mutateAsync(faq.id)
      toast.success(t("toast.deleted"))
      router.push("/faqs")
    } catch (e) {
      showApiError(e)
    }
  }

  return (
    <div className="flex flex-col gap-4 py-4 md:gap-6 md:py-6">
      <PageHeader
        title={
          mode === "create"
            ? tCreate("title")
            : tEdit("title", { id: faq?.id ?? "" })
        }
        actions={
          <Button variant="outline" type="button" onClick={() => router.back()}>
            {tc("actions.back")}
          </Button>
        }
      />

      <Form {...form}>
        <form className="grid gap-6" onSubmit={form.handleSubmit(onSubmit)}>
          <FormSection title={tCreate("sections.content")}>
            <div className="grid gap-4">
              <FormField
                control={form.control}
                name="question"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{tCreate("labels.question")}</FormLabel>
                    <FormControl>
                      <Input placeholder={tCreate("placeholders.question")} {...field} />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <FormField
                control={form.control}
                name="answer"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{tCreate("labels.answer")}</FormLabel>
                    <FormControl>
                      <Textarea
                        rows={16}
                        className="min-h-64 font-mono text-sm"
                        spellCheck={false}
                        placeholder={tCreate("placeholders.answer")}
                        {...field}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
            </div>
          </FormSection>

          <FormSection title={tCreate("sections.settings")}>
            <div className="grid gap-4 md:grid-cols-2">
              <FormField
                control={form.control}
                name="position"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{tCreate("labels.position")}</FormLabel>
                    <FormControl>
                      <Input
                        type="number"
                        min={0}
                        value={Number.isFinite(field.value) ? field.value : 0}
                        onChange={(event) => field.onChange(event.target.valueAsNumber)}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <StatusSwitchField
                control={form.control}
                name="active"
                label={tCreate("labels.active")}
                description={tCreate("help.activeOnly")}
              />
            </div>
          </FormSection>

          {mode === "edit" && faq ? (
            <EditDangerSection
              sectionTitle={tEdit("sections.dangerZone")}
              actionTitle={tEdit("danger.deleteTitle")}
              actionDescription={tEdit("danger.deleteDescription")}
              confirmMessage={t("confirm.delete", { name: faq.question })}
              actionLabel={tc("actions.delete")}
              disabled={isPending}
              isPending={deleteFaq.isPending}
              onDelete={handleDelete}
            />
          ) : null}

          <div className="px-4 lg:px-6">
            <div className="flex items-center justify-end gap-2">
              <Button variant="outline" type="button" onClick={() => router.back()}>
                {tc("actions.cancel")}
              </Button>
              <Button type="submit" disabled={isPending}>
                {mode === "create" ? tc("actions.create") : tc("actions.saveChanges")}
              </Button>
            </div>
          </div>
        </form>
      </Form>
    </div>
  )
}