'use client'

import { zodResolver } from '@hookform/resolvers/zod'
import { useEffect, useState } from 'react'
import dynamic from 'next/dynamic'
import { FormProvider, useFormContext, useWatch } from 'react-hook-form'

import { addToast } from '@/lib/toast'
import { Accordion, AccordionItem } from '@/components/heroui/Accordion'
import ArticleFeaturedImageUploader from '@/app/(dashboard)/blog-articles/_components/ArticleFeaturedImageUploader'
import Modal from '@/components/modals/Modal'
import Button from '@/components/formElements/Button'
import Input from '@/components/formElements/Input'
import { AdminFormSection } from '@/components/forms/AdminFormLayout'
import { SeoCharCounterHint } from '@/components/forms/SeoCharCounterHint'
import UnsavedChangesIndicator from '@/components/forms/UnsavedChangesIndicator'
import useAdminCrudFormModal from '@/hooks/useAdminCrudFormModal'
import { type BlogArticle, CREATE_ARTICLE, UPDATE_ARTICLE } from '@/services/blogArticles'
import { fetchAllCities, type City } from '@/services/geography'
import { LIST_ADMIN_CATEGORIES_FLAT } from '@/services/eventCategories'
import {
  analyzeArticleBody,
  ARTICLE_EXCERPT_MAX,
  ARTICLE_EXCERPT_MIN,
  ARTICLE_META_DESCRIPTION_MAX,
  ARTICLE_META_DESCRIPTION_MIN,
  ARTICLE_META_TITLE_MAX,
  ARTICLE_TITLE_MAX,
  ArticleFormValidation,
  BLOG_ARTICLE_CATEGORIES,
  type ArticleFormValues,
} from '@/validation/blogArticles'

const TextEditor = dynamic(() => import('@/components/formElements/TextEditor'), { ssr: false })

const NO_CITY_OPTION = { id: '', name: 'بدون شهر خاص' }
const NO_EVENT_CATEGORY_OPTION = { id: '', name: 'بدون دسته‌بندی رویداد خاص' }

const EMPTY_VALUES: ArticleFormValues = {
  slug: '',
  title: '',
  excerpt: '',
  metaTitle: '',
  metaDescription: '',
  categorySlug: 'attendee-guide',
  categoryName: BLOG_ARTICLE_CATEGORIES[0].name,
  cityId: '',
  eventCategoryId: '',
  bodyHtml: '',
  featuredImageUrl: '',
  isFeatured: false,
  isPublished: false,
  scheduledDate: '',
  scheduledTime: 0,
}

const splitScheduledAt = (value: string | null | undefined) => {
  if (!value) return { scheduledDate: '', scheduledTime: 0 }

  const date = new Date(value)

  return {
    scheduledDate: Number.isFinite(date.getTime()) ? date.toISOString() : '',
    scheduledTime: Number.isFinite(date.getTime()) ? date.getHours() * 60 + date.getMinutes() : 0,
  }
}

const combineScheduledAt = (dateValue: string, minutes: number) => {
  const date = new Date(dateValue)

  date.setHours(Math.floor(minutes / 60), minutes % 60, 0, 0)

  return date.toISOString()
}

const toFormValues = (article: BlogArticle): ArticleFormValues => ({
  slug: article.slug,
  title: article.title,
  excerpt: article.excerpt,
  metaTitle: article.metaTitle ?? '',
  metaDescription: article.metaDescription ?? '',
  categorySlug: article.categorySlug as ArticleFormValues['categorySlug'],
  categoryName: article.categoryName,
  cityId: article.city ? String(article.city.id) : '',
  eventCategoryId: article.eventCategory ? String(article.eventCategory.id) : '',
  bodyHtml: article.bodyHtml,
  featuredImageUrl: article.featuredImageUrl ?? '',
  isFeatured: article.isFeatured,
  isPublished: article.isPublished,
  ...splitScheduledAt(article.scheduledAt),
})

const buildPayload = (values: ArticleFormValues) => ({
  slug: values.slug,
  title: values.title,
  excerpt: values.excerpt,
  metaTitle: values.metaTitle || null,
  metaDescription: values.metaDescription || null,
  categorySlug: values.categorySlug,
  categoryName: values.categoryName,
  cityId: values.cityId ? Number(values.cityId) : null,
  eventCategoryId: values.eventCategoryId ? Number(values.eventCategoryId) : null,
  bodyHtml: values.bodyHtml,
  featuredImageUrl: values.featuredImageUrl || null,
  isFeatured: values.isFeatured,
  isPublished: values.isPublished,
  scheduledAt: !values.isPublished && values.scheduledDate ? combineScheduledAt(values.scheduledDate, values.scheduledTime) : null,
})

/** Keeps categoryName in sync with the selected categorySlug — categoryName
 * is stored on the row for display convenience but is never a field the
 * admin edits directly, so it can't drift from the taxonomy label. */
const CategoryNameSync = () => {
  const { setValue } = useFormContext<ArticleFormValues>()
  const categorySlug = useWatch<ArticleFormValues, 'categorySlug'>({ name: 'categorySlug' })

  useEffect(() => {
    const match = BLOG_ARTICLE_CATEGORIES.find((item) => item.code === categorySlug)

    if (match) setValue('categoryName', match.name)
  }, [categorySlug, setValue])

  return null
}

const ArticleBodyField = () => {
  const { setValue } = useFormContext<ArticleFormValues>()
  const bodyHtml = useWatch<ArticleFormValues, 'bodyHtml'>({ name: 'bodyHtml' })
  const analysis = analyzeArticleBody(bodyHtml)
  const checks = [
    { ok: analysis.wordCount >= 250, label: `${analysis.wordCount.toLocaleString('fa-IR')} واژه از حداقل ۲۵۰ واژه` },
    { ok: analysis.headingCount >= 2, label: `${analysis.headingCount.toLocaleString('fa-IR')} تیتر H2/H3 از حداقل ۲ تیتر` },
    { ok: analysis.internalLinkCount >= 1, label: 'حداقل یک لینک داخلی مرتبط' },
    { ok: analysis.imagesWithoutAlt === 0, label: 'تمام تصاویر داخل متن دارای alt هستند' },
  ]

  return (
    <div className="space-y-3">
      <TextEditor
        required
        label="متن مقاله"
        value={bodyHtml}
        onChange={(value) => {
          setValue('bodyHtml', value, { shouldDirty: true })
        }}
      />
      <div
        aria-live="polite"
        className="grid gap-2 rounded-xl border border-secondary-40 bg-secondary-50 p-3 text-xs sm:grid-cols-2"
      >
        {checks.map((check) => (
          <div
            key={check.label}
            className={check.ok ? 'text-fifth-700' : 'text-fourth-700'}
          >
            {check.ok ? '✓' : '○'} {check.label}
          </div>
        ))}
      </div>
    </div>
  )
}

const FeaturedImageField = () => {
  const { setValue } = useFormContext<ArticleFormValues>()
  const featuredImageUrl = useWatch<ArticleFormValues, 'featuredImageUrl'>({ name: 'featuredImageUrl' })

  return (
    <ArticleFeaturedImageUploader
      value={featuredImageUrl ?? ''}
      onChange={(url) => {
        setValue('featuredImageUrl', url, { shouldDirty: true })
      }}
    />
  )
}

const ScheduledPublishingFields = () => {
  const { setValue } = useFormContext<ArticleFormValues>()
  const isPublished = useWatch<ArticleFormValues, 'isPublished'>({ name: 'isPublished' })
  const scheduledDate = useWatch<ArticleFormValues, 'scheduledDate'>({ name: 'scheduledDate' })

  if (isPublished) return null

  return (
    <div className="space-y-3 rounded-xl border border-fourth-100 bg-fourth-100 p-3 sm:col-span-2">
      <p className="text-xs leading-6 text-fourth-900">
        برای نگه‌داشتن مقاله به‌صورت پیش‌نویس، تاریخ را خالی بگذارید. با انتخاب تاریخ و ساعت، مقاله خودکار منتشر می‌شود.
      </p>
      <div className="grid gap-3 sm:grid-cols-2">
        <Input
          generalType="datePicker"
          label="تاریخ انتشار"
          minDate={new Date().toISOString()}
          name="scheduledDate"
        />
        <Input
          generalType="timePicker"
          label="ساعت انتشار"
          name="scheduledTime"
        />
      </div>
      {scheduledDate ? (
        <Button
          size="sm"
          variant="light"
          onClick={() => {
            setValue('scheduledDate', '', { shouldDirty: true, shouldValidate: true })
          }}
        >
          لغو زمان‌بندی و نگه‌داری به‌صورت پیش‌نویس
        </Button>
      ) : null}
    </div>
  )
}

interface ArticleFormModalProps {
  isOpen: boolean
  onOpenChange: (isOpen: boolean) => void
  article?: BlogArticle
  onSuccess: () => void
}

const ArticleFormModal = ({ isOpen, onOpenChange, article, onSuccess }: ArticleFormModalProps) => {
  const [cities, setCities] = useState<City[]>([])
  const [eventCategories, setEventCategories] = useState<{ id: number; name: string }[]>([])

  const { form, isEdit, submitting, handleSubmit } = useAdminCrudFormModal({
    entity: article,
    isOpen,
    emptyValues: EMPTY_VALUES,
    toFormValues,
    resolver: zodResolver(ArticleFormValidation),
    buildPayload,
    create: CREATE_ARTICLE,
    update: UPDATE_ARTICLE,
    getId: (entity) => entity.id,
    successMessage: { create: 'مقاله ایجاد شد', edit: 'مقاله ویرایش شد' },
    onOpenChange,
    onSuccess,
  })

  useEffect(() => {
    fetchAllCities()
      .then(setCities)
      .catch(() => addToast({ title: 'بارگذاری فهرست شهرها ناموفق بود', color: 'danger' }))

    void LIST_ADMIN_CATEGORIES_FLAT().then((result) => {
      if (result.ok) setEventCategories(result.data.items)
    })
  }, [])

  const cityOptions = [NO_CITY_OPTION, ...cities.map((city) => ({ id: String(city.id), name: city.name }))]
  const eventCategoryOptions = [
    NO_EVENT_CATEGORY_OPTION,
    ...eventCategories.map((category) => ({ id: String(category.id), name: category.name })),
  ]

  return (
    <Modal
      acceptBtnText={isEdit ? 'ذخیره تغییرات' : 'ایجاد مقاله'}
      isLoading={submitting}
      isOpen={isOpen}
      scrollBehavior="inside"
      size="2xl"
      title={isEdit ? `ویرایش «${article?.title}»` : 'مقاله جدید'}
      onAccept={handleSubmit}
      onOpenChange={onOpenChange}
    >
      <FormProvider {...form}>
        <form
          className="flex flex-col gap-4"
          onSubmit={handleSubmit}
        >
          <UnsavedChangesIndicator isDirty={form.formState.isDirty} />
          <CategoryNameSync />

          <AdminFormSection
            contained={false}
            description="عنوان، آدرس و دسته‌بندی مقاله"
            title="اطلاعات اصلی"
          >
            <div className="flex flex-col gap-4">
              <Input
                required
                description={
                  <SeoCharCounterHint<ArticleFormValues>
                    max={ARTICLE_TITLE_MAX}
                    name="title"
                  />
                }
                generalType="input"
                label="عنوان"
                name="title"
                placeholder="راهنمای پیدا کردن رویداد در ..."
              />
              <Input
                required
                description={article?.publishedAt ? 'برای حفظ اعتبار URL، اسلاگ مقاله منتشرشده قابل تغییر نیست.' : undefined}
                direction="ltr"
                disabled={Boolean(article?.publishedAt)}
                generalType="input"
                label="اسلاگ (شناسه‌ی آدرس)"
                name="slug"
                placeholder="ahvaz-events-guide"
              />
              <Input
                required
                description={
                  <SeoCharCounterHint<ArticleFormValues>
                    max={ARTICLE_EXCERPT_MAX}
                    min={ARTICLE_EXCERPT_MIN}
                    name="excerpt"
                  />
                }
                generalType="textarea"
                label="خلاصه (توضیح در فهرست و meta description)"
                name="excerpt"
              />
              <div className="grid grid-cols-1 gap-4 sm:grid-cols-3">
                <Input
                  required
                  generalType="select"
                  label="دسته‌بندی بلاگ"
                  name="categorySlug"
                  selectKey="code"
                  selectOptions={BLOG_ARTICLE_CATEGORIES as unknown as Record<string, unknown>[]}
                  selectValue="name"
                />
                <Input
                  generalType="select"
                  label="شهر مرتبط"
                  name="cityId"
                  selectKey="id"
                  selectOptions={cityOptions}
                  selectValue="name"
                />
                <Input
                  generalType="select"
                  label="دسته‌بندی رویداد مرتبط"
                  name="eventCategoryId"
                  selectKey="id"
                  selectOptions={eventCategoryOptions}
                  selectValue="name"
                />
              </div>
            </div>
          </AdminFormSection>

          <AdminFormSection
            contained={false}
            description="نحوه نمایش مقاله در نتایج جستجو"
            title="بهینه‌سازی موتور جستجو"
          >
            <Accordion variant="bordered">
              <AccordionItem
                key="seo"
                aria-label="تنظیمات SEO"
                subtitle="در صورت خالی بودن، عنوان و خلاصه‌ی بالا استفاده می‌شود"
                title="عنوان و توضیح جایگزین (اختیاری)"
              >
                <div className="flex flex-col gap-4 pb-2">
                  <Input
                    description={
                      <SeoCharCounterHint<ArticleFormValues>
                        max={ARTICLE_META_TITLE_MAX}
                        name="metaTitle"
                      />
                    }
                    generalType="input"
                    label="عنوان SEO"
                    name="metaTitle"
                  />
                  <Input
                    description={
                      <SeoCharCounterHint<ArticleFormValues>
                        max={ARTICLE_META_DESCRIPTION_MAX}
                        min={ARTICLE_META_DESCRIPTION_MIN}
                        name="metaDescription"
                      />
                    }
                    generalType="textarea"
                    label="توضیحات SEO"
                    name="metaDescription"
                  />
                </div>
              </AccordionItem>
            </Accordion>
          </AdminFormSection>

          <AdminFormSection
            contained={false}
            description="تصویری که در کارت‌ها و شبکه‌های اجتماعی نمایش داده می‌شود"
            title="تصویر شاخص"
          >
            <FeaturedImageField />
          </AdminFormSection>

          <AdminFormSection
            contained={false}
            description="متن اصلی مقاله"
            title="بدنه مقاله"
          >
            <ArticleBodyField />
          </AdminFormSection>

          <AdminFormSection
            contained={false}
            description="اولویت و وضعیت انتشار مقاله"
            title="تنظیمات نمایش"
          >
            <div className="grid gap-3 rounded-xl bg-secondary-50 p-3 sm:grid-cols-2">
              <Input
                generalType="switch"
                label="ویژه"
                name="isFeatured"
              />
              <Input
                generalType="switch"
                label="منتشرشده"
                name="isPublished"
              />
              <ScheduledPublishingFields />
            </div>
          </AdminFormSection>
        </form>
      </FormProvider>
    </Modal>
  )
}

export default ArticleFormModal