import { notFound } from 'next/navigation'
import { getTranslations, setRequestLocale } from 'next-intl/server'
import {
  getTopic,
  getTopicPath,
  getPosts,
  countPosts,
  resolvePosters,
  getUserPostCount,
} from '@/lib/forum'
import { formatForumDate } from '@/lib/forum-format'
import { getSession } from '@/lib/session'
import { forumIsModerator, canEditPost } from '@/lib/forum-perm'
import { PageShell } from '@/components/PageShell'
import { ForumBreadcrumb } from '@/components/ForumBreadcrumb'
import { Pagination } from '@/components/Pagination'
import { ReplyForm } from '@/components/ReplyForm'
import { EditPostForm } from '@/components/EditPostForm'
import { ForumModActions } from '@/components/ForumModActions'

export const dynamic = 'force-dynamic'

const PER_PAGE = 5

export default async function TopicPage({
  params,
  searchParams,
}: {
  params: Promise<{ locale: string; topicId: string }>
  searchParams: Promise<{ page?: string }>
}) {
  const { locale, topicId } = await params
  setRequestLocale(locale)
  const t = await getTranslations('Forum')

  const id = Number(topicId)
  const session = await getSession()
  const isMod = await forumIsModerator(session)
  const topic = await getTopic(id, isMod)
  if (!topic) notFound()

  const total = await countPosts(id, isMod)
  const totalPages = Math.max(1, Math.ceil(total / PER_PAGE))
  const page = Math.min(Math.max(1, Number((await searchParams).page) || 1), totalPages)
  const posts = await getPosts(id, (page - 1) * PER_PAGE, PER_PAGE, isMod)

  const posters = await resolvePosters(posts.map((p) => p.poster))
  // Nº de posts por autor visible (para el panel lateral), en paralelo.
  const uniquePosters = [...new Set(posts.map((p) => p.poster))]
  const counts = new Map<number, number>(
    await Promise.all(uniquePosters.map(async (pid) => [pid, await getUserPostCount(pid)] as const)),
  )

  const path = await getTopicPath(id)
  const canReply = Boolean(session.username) && (!topic.locked || isMod)

  return (
    <PageShell
      title={
        <>
          {topic.sticky && `[${t('sticky')}] `}
          {topic.locked && `[${t('locked')}] `}
          {topic.deleted && `[${t('deleted')}] `}
          {topic.name}
        </>
      }
    >
      <div className="main-wide">
        {path && (
          <ForumBreadcrumb
            items={[
              { label: t('title'), href: '/forum' },
              { label: path.forum, href: `/forum/${path.forum_id}` },
              { label: path.topic },
            ]}
          />
        )}

        <div className="topic_header">
          <div className="topic_title">
            <h1>{topic.name}</h1>
            <h3>{formatForumDate(topic.created, locale)}</h3>
          </div>
          <h4>
            <b>{total}</b> {t('posts')}
          </h4>
        </div>

        <div className="actions_c">
          <span />
          <Pagination page={page} totalPages={totalPages} hrefFor={(p) => `/forum/topic/${id}?page=${p}`} />
        </div>

        {posts.map((post) => {
          const author = posters.get(post.poster)
          const isStaff = author?.isStaff ?? false
          return (
            <div key={post.id} className={`topic_post${isStaff ? ' isStaff' : ''}${post.deleted ? ' post_deleted' : ''}`}>
              <div className="left_side">
                <div className="username_container">
                  <span className="username">{author?.name ?? `#${post.poster}`}</span>
                </div>
                <div className={`user_avatar${isStaff ? ' isStaff' : ''}`}>
                  <span
                    style={{
                      background: `url(${author?.avatar ?? '/forum/avatars/class-1.gif'}) no-repeat center`,
                      backgroundSize: 'cover',
                    }}
                  />
                </div>
                <div className="user_info">
                  <h3 className="post_field">
                    <dt>
                      <i className="fa-solid fa-user-shield fa-fw" />
                    </dt>
                    <dd className={isStaff ? 'badge_staff' : undefined}>{isStaff ? t('staff') : t('member')}</dd>
                  </h3>
                  <h3 className="post_field">
                    <dt>
                      <i className="fa-solid fa-calendar fa-fw" />
                    </dt>
                    <dd>{formatForumDate(author?.joindate ?? null, locale) || '—'}</dd>
                  </h3>
                  <h3 className="post_field">
                    <dt>
                      <i className="fa-solid fa-comments fa-fw" />
                    </dt>
                    <dd>
                      {t('posts')}: {counts.get(post.poster) ?? 0}
                    </dd>
                  </h3>
                </div>
              </div>
              <div className="right_side">
                <div className="post_container" dangerouslySetInnerHTML={{ __html: post.text }} />
                <ul className="post_controls">
                  <li className="post_date">{formatForumDate(post.time, locale)}</li>
                  {canEditPost(session, isMod, post.poster) && (
                    <li>
                      <EditPostForm postId={post.id} initialText={post.text} />
                    </li>
                  )}
                  {isMod && (
                    <li>
                      <ForumModActions kind="post" id={post.id} deleted={post.deleted} />
                    </li>
                  )}
                </ul>
              </div>
            </div>
          )
        })}

        <div className="actions_c">
          <span />
          <Pagination page={page} totalPages={totalPages} hrefFor={(p) => `/forum/topic/${id}?page=${p}`} />
        </div>

        {isMod && (
          <div className="forum-form-actions" style={{ marginBottom: 20 }}>
            <ForumModActions kind="topic" id={id} deleted={topic.deleted} locked={topic.locked} />
          </div>
        )}

        {canReply ? (
          page === totalPages ? (
            <ReplyForm topicId={id} />
          ) : (
            <p className="forum-empty">
              <a href={`/forum/topic/${id}?page=${totalPages}`}>{t('replyOnLastPage')}</a>
            </p>
          )
        ) : (
          !session.username && <p className="forum-empty">{t('loginToPost')}</p>
        )}
      </div>
    </PageShell>
  )
}
