import { useEffect, useMemo, useState } from 'react'
import { Link, useParams } from 'react-router-dom'
import { CalendarDays } from 'lucide-react'
import { useLocale } from '@meshkee/dashboard-ui'
import { Breadcrumbs } from '../components/Breadcrumbs'
import { ImageLightbox } from '../components/ImageLightbox'
import { useT } from '../i18n/useT'
import { ApiError } from '../lib/api'
import { formatWorkshopDate, formatWorkshopDuration, getWorkshopDetail } from '../services/workshopService'
import type { WorkshopDetail } from '../types/workshop'
import pageStyles from '../components/PageContent.module.css'
import styles from './PortfolioDetailsPage.module.css'

export function WorkshopDetailsPage() {
  const t = useT()
  const { locale } = useLocale()
  const { id } = useParams()
  const [workshop, setWorkshop] = useState<WorkshopDetail | null>(null)
  const [isLoading, setIsLoading] = useState(true)
  const [error, setError] = useState('')
  const [lightboxOpen, setLightboxOpen] = useState(false)
  const [lightboxIndex, setLightboxIndex] = useState(0)

  useEffect(() => {
    if (!id) return

    const controller = new AbortController()

    async function loadWorkshop() {
      setIsLoading(true)
      setError('')

      try {
        const data = await getWorkshopDetail(id!, controller.signal)
        setWorkshop(data)
      } catch (err) {
        if (err instanceof DOMException && err.name === 'AbortError') return
        if (err instanceof ApiError) {
          setError(err.message)
        } else {
          setError(t('workshop.details.errorLoad'))
        }
        setWorkshop(null)
      } finally {
        setIsLoading(false)
      }
    }

    void loadWorkshop()
    return () => controller.abort()
  }, [id])

  const galleryImages = useMemo(
    () => workshop?.gallery.map((item) => item.url).filter(Boolean) ?? [],
    [workshop],
  )

  function openLightbox(index: number) {
    setLightboxIndex(index)
    setLightboxOpen(true)
  }

  if (isLoading) {
    return (
      <main className={pageStyles.content}>
        <p className={styles.status}>{t('workshop.details.loading')}</p>
      </main>
    )
  }

  if (error || !workshop || !id) {
    return (
      <main className={pageStyles.content}>
        <p className={styles.error}>{error || t('workshop.details.notFound')}</p>
        <Link to="/workshops/list" className={styles.backLink}>
          {t('workshop.details.back')}
        </Link>
      </main>
    )
  }

  const displayDate = formatWorkshopDate(
    workshop.publishedAt ?? workshop.createdAt,
    locale === 'fa' ? 'fa' : 'en',
  )
  const dateLocale = locale === 'fa' ? 'fa' : 'en'
  const hasSchedule = Boolean(workshop.eventDate || workshop.eventTime || workshop.duration)

  return (
    <>
      <div className={pageStyles.content}>
        <Breadcrumbs
          items={[
            { label: 'Dashboard', href: '/' },
            { label: 'Workshops', href: '/workshops' },
            { label: 'My Workshops', href: '/workshops/list' },
            { label: workshop.title },
          ]}
        />

        <div className={pageStyles.pageHeader}>
          <div>
            <h2 className={pageStyles.pageTitle}>{workshop.title}</h2>
            {workshop.abstract && (
              <p className={pageStyles.pageSubtitleContent}>{workshop.abstract}</p>
            )}
          </div>
        </div>

        <article className={styles.portfolioDetail}>
          <div
            className={`${styles.heroImageWrap} ${
              workshop.coverImageUrl ? '' : styles.heroImageWrapEmpty
            }`}
          >
            {workshop.coverImageUrl ? (
              <img
                src={workshop.coverImageUrl}
                alt={workshop.title}
                className={styles.heroImage}
              />
            ) : (
              <div className={styles.heroPlaceholder} aria-hidden="true" />
            )}
          </div>

          <div className={styles.metaRow}>
            {hasSchedule && (
              <>
                <span className={styles.metaItem}>
                  <CalendarDays size={15} />
                  {[
                    workshop.eventDate
                      ? formatWorkshopDate(workshop.eventDate, dateLocale)
                      : null,
                    workshop.eventTime || null,
                    workshop.duration ? formatWorkshopDuration(workshop.duration) : null,
                  ]
                    .filter(Boolean)
                    .join(' · ')}
                </span>
                <span className={styles.metaDot}>·</span>
              </>
            )}
            <span className={styles.metaItem}>
              <CalendarDays size={15} />
              {displayDate}
            </span>
            {(workshop.categoryName || workshop.tags.length > 0) && (
              <>
                <span className={styles.metaDot}>·</span>
                <div className={styles.metaChips}>
                  {workshop.categoryName && (
                    <span className={styles.categoryChip}>{workshop.categoryName}</span>
                  )}
                  {workshop.tags.map((tag) => (
                    <span key={tag} className={styles.tagChip}>
                      {tag}
                    </span>
                  ))}
                </div>
              </>
            )}
          </div>

          <div className={styles.contentPanel}>
            {workshop.descriptionHtml ? (
              <div
                className={styles.content}
                dangerouslySetInnerHTML={{ __html: workshop.descriptionHtml }}
              />
            ) : (
              <p className={styles.content}>{t('workshop.details.noContent')}</p>
            )}
          </div>
        </article>
      </div>

      {galleryImages.length > 0 && (
        <section className={styles.galleryBand} aria-label={t('workshop.details.gallery')}>
          <div className={styles.galleryInner}>
            <h3 className={styles.galleryTitle}>{t('workshop.details.gallery')}</h3>
            <div className={styles.galleryGrid}>
              {galleryImages.map((src, index) => (
                <button
                  key={`${src}-${index}`}
                  type="button"
                  className={styles.galleryItem}
                  onClick={() => openLightbox(index)}
                  aria-label={t('workshop.details.galleryImage', { index: index + 1 })}
                >
                  <img src={src} alt={`${workshop.title} gallery ${index + 1}`} loading="lazy" />
                </button>
              ))}
            </div>
          </div>
        </section>
      )}

      {galleryImages.length > 0 && (
        <ImageLightbox
          open={lightboxOpen}
          images={galleryImages}
          initialIndex={lightboxIndex}
          alt={workshop.title}
          onClose={() => setLightboxOpen(false)}
        />
      )}
    </>
  )
}