"use client"

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

import { EditDangerSection } from "@/components/edit-danger-section"
import { MediaFileField } from "@/components/markatty/media-file-field"
import { FormSection } from "@/components/form-section"
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 {
  useCreateSlider,
  useDeleteSlider,
  useUpdateSlider,
} from "@/hooks/api/use-sliders"
import { useRouter } from "@/i18n/navigation"
import { ApiError } from "@/lib/api/errors"
import type { SliderRecord } from "@/lib/markatty"

const sliderSchema = z.object({
  targetUrl: z.string().refine(
    (value) => value.trim() === "" || z.string().url().safeParse(value.trim()).success,
    { message: "Enter a valid target URL." }
  ),
  imageFile: z.any().optional(),
})

type SliderFormValues = z.infer<typeof sliderSchema>

function toDefaultValues(slider?: SliderRecord): SliderFormValues {
  return {
    targetUrl: slider?.targetUrl ?? "",
    imageFile: null,
  }
}

export function SliderEditor({
  mode,
  slider,
}: {
  mode: "create" | "edit"
  slider?: SliderRecord
}) {
  const t = useTranslations("Sliders")
  const tCreate = useTranslations("Sliders.Create")
  const tEdit = useTranslations("Sliders.Edit")
  const tc = useTranslations("Common")
  const router = useRouter()
  const createSlider = useCreateSlider()
  const updateSlider = useUpdateSlider()
  const deleteSlider = useDeleteSlider()

  const form = useForm<SliderFormValues>({
    resolver: zodResolver(sliderSchema),
    defaultValues: toDefaultValues(slider),
    values: slider ? toDefaultValues(slider) : undefined,
  })

  const isPending =
    createSlider.isPending || updateSlider.isPending || deleteSlider.isPending

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

  async function onSubmit(values: SliderFormValues) {
    if (mode === "create" && !(values.imageFile instanceof File)) {
      form.setError("imageFile", { message: tCreate("errors.imageRequired") })
      return
    }

    const input = {
      url: values.targetUrl.trim(),
      imageFile: values.imageFile instanceof File ? values.imageFile : null,
    }

    try {
      if (mode === "create") {
        await createSlider.mutateAsync(input)
      } else if (slider) {
        await updateSlider.mutateAsync({ id: slider.id, ...input })
      }
      router.back()
    } catch (e) {
      showApiError(e)
    }
  }

  async function handleDelete() {
    if (!slider) return
    try {
      await deleteSlider.mutateAsync(slider.id)
      toast.success(t("toast.deleted"))
      router.back()
    } catch (e) {
      showApiError(e)
    }
  }

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

      <Form {...form}>
        <form className="gap-6 grid" onSubmit={form.handleSubmit(onSubmit)}>
          <FormSection title={tCreate("sections.content")}>
            <div className="gap-4 grid md:grid-cols-2">
              {mode === "edit" && slider ? (
                <div className="flex flex-wrap items-center gap-3 md:col-span-2 text-muted-foreground text-sm">
                  <span>
                    {tCreate("labels.type")}: {slider.type}
                  </span>
                  <span>
                    {tCreate("labels.locale")}: {slider.locale || "—"}
                  </span>
                </div>
              ) : null}
              <FormField
                control={form.control}
                name="targetUrl"
                render={({ field }) => (
                  <FormItem className="md:col-span-2">
                    <FormLabel>{tCreate("labels.targetUrl")}</FormLabel>
                    <FormControl>
                      <Input placeholder={tCreate("placeholders.targetUrl")} {...field} />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              <FormField
                control={form.control}
                name="imageFile"
                render={({ field }) => (
                  <MediaFileField
                    className="md:col-span-2"
                    label={tCreate("labels.image")}
                    accept="image/*"
                    name={field.name}
                    onBlur={field.onBlur}
                    inputRef={field.ref}
                    onChange={field.onChange}
                    helperText={
                      mode === "create"
                        ? tCreate("help.imageFileOnly")
                        : tCreate("help.imageFileOptional")
                    }
                    currentText={
                      slider?.imageUrl
                        ? tCreate("help.currentFile", { value: slider.imageUrl })
                        : undefined
                    }
                    previewUrl={slider?.imageUrl}
                    selectedPreviewLabel={tCreate("labels.selectedImage")}
                    currentPreviewLabel={tCreate("labels.currentImage")}
                    previewClassName="h-50 w-120"
                    previewKind="image"
                  />
                )}
              />
            </div>
          </FormSection>

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

          <div className="px-4 lg:px-6">
            <div className="flex justify-end items-center 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>
  )
}