'use client'

import { useMemo } from 'react'
import { Note } from '@/lib/types'
import { cn } from '@/lib/utils'
import { formatDistanceToNow, Locale } from 'date-fns'
import { enUS } from 'date-fns/locale/en-US'
import { fr } from 'date-fns/locale/fr'
import { useLanguage } from '@/lib/i18n'
import { Users, FileText, ImageIcon } from 'lucide-react'
import { useSession } from 'next-auth/react'

const localeMap: Record<string, Locale> = {
  en: enUS,
  fr,
}

function stripHtml(html: string): string {
  return html.replace(/<[^>]+>/g, ' ').replace(/\s+/g, ' ').trim()
}

function firstImageFromContent(html: string): string | null {
  const m = html.match(/<img[^>]+src=["']([^"']+)["']/i)
  return m ? m[1] : null
}

function previewText(note: Note): string {
  if (note.type === 'richtext') {
    return stripHtml(note.content || '').slice(0, 280)
  }
  if (note.type === 'markdown') {
    return (note.content || '')
      .replace(/^#{1,6}\s+/gm, '')
      .replace(/[*`_~]/g, '')
      .replace(/\[(.*?)\]\([^)]*\)/g, '$1')
      .slice(0, 280)
  }
  if (note.type === 'checklist') {
    const items = (note.checkItems || []).map((i) => i.text).join(' · ')
    return items.slice(0, 280)
  }
  return (note.content || '').slice(0, 280)
}

function thumbUrl(note: Note): string | null {
  if (note.images?.length) return note.images[0]!
  if (note.type === 'richtext' && note.content) {
    return firstImageFromContent(note.content)
  }
  return null
}

interface NotesListViewProps {
  notes: Note[]
  onEdit?: (note: Note, readOnly?: boolean) => void
}

export function NotesListView({
  notes,
  onEdit,
}: NotesListViewProps) {
  const { t, language } = useLanguage()
  const { data: session } = useSession()
  const currentUserId = session?.user?.id
  const locale = localeMap[language] || enUS
  const sorted = useMemo(
    () =>
      [...notes].sort(
        (a, b) =>
          new Date(b.contentUpdatedAt || b.updatedAt).getTime() -
          new Date(a.contentUpdatedAt || a.updatedAt).getTime()
      ),
    [notes]
  )

  if (sorted.length === 0) {
    return (
      <p className="py-12 text-center text-sm text-muted-foreground" data-testid="notes-list-empty">
        {t('notes.emptyState')}
      </p>
    )
  }

  return (
    <div className="flex flex-col gap-3" data-testid="notes-list-view">
      {sorted.map((note) => {
        const thumb = thumbUrl(note)
        const preview = previewText(note)
        const title = note.title?.trim() || t('notes.untitled')
        const edited = new Date(note.contentUpdatedAt || note.updatedAt)
        const sharedCount = note.sharedWith?.length ?? 0
        const isShared = sharedCount > 0 || (note as any)._isShared

        const isSharedNote = !!(currentUserId && note.userId && currentUserId !== note.userId)

        return (
          <button
            key={note.id}
            type="button"
            onClick={() => onEdit?.(note, !!isSharedNote)}
            className={cn(
              'group flex w-full gap-5 rounded-2xl border border-border/50 bg-card/90 p-4 text-start shadow-sm transition-all duration-200',
              'hover:border-primary/25 hover:shadow-[0_8px_30px_-12px_color-mix(in_oklab, var(--foreground) 14%, transparent)] focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/30',
              'md:gap-6 md:p-5'
            )}
          >
            <div
              className="relative size-[4.5rem] shrink-0 overflow-hidden rounded-xl border border-border/40 bg-muted/40 md:size-24"
              aria-hidden
            >
              {thumb ? (
                <img src={thumb} alt="" className="h-full w-full object-cover" loading="lazy" />
              ) : (
                <div className="flex h-full w-full items-center justify-center text-muted-foreground/50">
                  <FileText className="size-8 stroke-[1.25]" />
                </div>
              )}
            </div>

            <div className="flex min-w-0 flex-1 flex-col gap-2">
              <div className="flex flex-wrap items-baseline justify-between gap-2 gap-y-1">
                <h3 className="font-memento-serif text-lg font-normal leading-snug tracking-tight text-foreground md:text-xl">
                  {title}
                </h3>
                <time
                  dateTime={edited.toISOString()}
                  className="shrink-0 text-[11px] font-medium uppercase tracking-wider text-muted-foreground tabular-nums"
                >
                  {formatDistanceToNow(edited, { addSuffix: true, locale })}
                </time>
              </div>

              {preview ? (
                <p className="line-clamp-2 text-sm leading-relaxed text-muted-foreground md:line-clamp-3">{preview}</p>
              ) : null}

              <div className="flex flex-wrap items-center gap-x-3 gap-y-2">
                {(note.labels?.length ?? 0) > 0 && (
                  <div className="flex flex-wrap gap-1.5">
                    {note.labels!.slice(0, 6).map((label) => (
                      <span
                        key={label}
                        className="rounded-md border border-border/60 bg-muted/30 px-2 py-0.5 text-[11px] font-medium text-foreground/80"
                      >
                        {label}
                      </span>
                    ))}
                    {note.labels!.length > 6 && (
                      <span className="text-[11px] text-muted-foreground">+{note.labels!.length - 6}</span>
                    )}
                  </div>
                )}
                {isShared && (
                  <span className="inline-flex items-center gap-1 text-[11px] font-medium text-primary">
                    <Users className="size-3.5 opacity-80" />
                    {sharedCount > 0 ? `${sharedCount}` : t('notes.sharedShort') || 'Partagé'}
                  </span>
                )}
              </div>
            </div>
          </button>
        )
      })}
    </div>
  )
}