import type { APIRoute } from 'astro';
import { requireAdmin } from '../../../lib/adminAuth';
import { readCms, writeCms, type PostStatus } from '../../../lib/cms';
import { publishPost } from '../../../lib/publisher';
import { getTassFeedLinks } from '../../../lib/tassAgent';

const toList = (value: FormDataEntryValue | null) => String(value ?? '')
  .split(/\r?\n|,/)
  .map((item) => item.trim())
  .filter(Boolean);

const toParagraphs = (value: FormDataEntryValue | null) => String(value ?? '')
  .split(/\n\s*\n/)
  .map((item) => item.trim())
  .filter(Boolean);

export const POST: APIRoute = async (context) => {
  const unauthorized = requireAdmin(context);

  if (unauthorized) {
    return unauthorized;
  }

  const formData = await context.request.formData();
  const action = String(formData.get('action') ?? '');
  const cms = await readCms();
  const tab = String(formData.get('tab') ?? 'pending');

  if (action === 'post-status') {
    const slug = String(formData.get('slug') ?? '');
    const status = String(formData.get('status') ?? 'pending') as PostStatus;
    cms.posts = cms.posts.map((post) => (
      post.slug === slug ? { ...post, status } : post
    ));
  }

  if (action === 'toggle-post-flag') {
    const slug = String(formData.get('slug') ?? '');
    const flag = String(formData.get('flag') ?? '');

    cms.posts = cms.posts.map((post) => {
      if (post.slug !== slug) {
        return post;
      }

      if (flag === 'urgent') {
        return { ...post, urgent: !post.urgent };
      }

      if (flag === 'sidebar') {
        return { ...post, sidebar: !post.sidebar };
      }

      return post;
    });
  }

  if (action === 'set-breaking-post') {
    const slug = String(formData.get('slug') ?? '');
    const post = cms.posts.find((item) => item.slug === slug);

    if (post) {
      cms.settings.breakingNews = {
        ...cms.settings.breakingNews,
        href: `/posts/${post.slug}/`,
        items: [post.title],
        postSlugs: [post.slug],
      };
    }
  }

  if (action === 'set-home-featured') {
    const slug = String(formData.get('slug') ?? '');
    cms.settings.homeLayout.featuredSlug = slug;
  }

  if (action === 'clear-tass-memory') {
    cms.settings.agents = {
      ...cms.settings.agents,
      tass: { processedLinks: [] },
    };
  }

  if (action === 'fill-tass-memory') {
    const links = cms.posts
      .map((post) => post.sourceUrl)
      .filter(Boolean) as string[];
    const feedLinks = await getTassFeedLinks(50);
    cms.settings.agents = {
      ...cms.settings.agents,
      tass: { processedLinks: Array.from(new Set([...links, ...feedLinks])) },
    };
  }

  if (action === 'delete-post') {
    const slug = String(formData.get('slug') ?? '');
    const confirm = String(formData.get('confirm') ?? '');

    if (confirm !== 'confirm') {
      return context.redirect(`/admin/?deleteError=1&tab=${encodeURIComponent(tab)}`, 302);
    }

    cms.posts = cms.posts.filter((post) => post.slug !== slug);
  }

  if (action === 'delete-all-posts') {
    const confirm = String(formData.get('confirm') ?? '');

    if (confirm !== 'confirm') {
      return context.redirect(`/admin/?deleteError=1&tab=${encodeURIComponent(tab)}`, 302);
    }

    cms.posts = [];
  }

  if (action === 'save-post') {
    const originalSlug = String(formData.get('originalSlug') ?? '');
    const title = String(formData.get('title') ?? '').trim();
    const post = await publishPost({
      slug: String(formData.get('slug') ?? '') || title,
      title,
      category: String(formData.get('category') ?? cms.categories[0] ?? 'عمومی'),
      time: String(formData.get('time') ?? '').trim() || 'هم‌اکنون',
      readTime: String(formData.get('readTime') ?? '').trim() || '۳ دقیقه',
      excerpt: String(formData.get('excerpt') ?? '').trim(),
      status: String(formData.get('status') ?? 'pending') as PostStatus,
      body: toParagraphs(formData.get('body')),
      image: String(formData.get('image') ?? '').trim() || undefined,
      thumbnail: String(formData.get('thumbnail') ?? '').trim() || undefined,
      urgent: formData.get('urgent') === 'on',
      sidebar: formData.get('sidebar') === 'on',
    });

    if (originalSlug && originalSlug !== post.slug) {
      const updatedCms = await readCms();
      updatedCms.posts = updatedCms.posts.filter((post) => post.slug !== originalSlug);
      await writeCms(updatedCms);
    }

    return context.redirect(`/admin/?saved=1&tab=${post.status === 'approved' ? 'approved' : 'pending'}`, 302);
  }

  if (action === 'categories') {
    cms.categories = toList(formData.get('categories'));
  }

  if (action === 'settings') {
    cms.settings.breakingNews = {
      label: String(formData.get('breakingLabel') ?? 'فوری').trim(),
      href: String(formData.get('breakingHref') ?? '/').trim(),
      items: toList(formData.get('breakingItems')),
      postSlugs: toList(formData.get('breakingPostSlugs')),
    };
    cms.settings.hotTopics = toList(formData.get('hotTopics'));
    cms.settings.homeLayout = {
      featuredSlug: String(formData.get('featuredSlug') ?? '').trim(),
      sideFeaturedSlugs: toList(formData.get('sideFeaturedSlugs')).slice(0, 2),
      latestCount: Math.max(1, Number(formData.get('latestCount') ?? 4)),
      showAd: formData.get('showAd') === 'on',
    };
    cms.settings.ad = {
      enabled: formData.get('adEnabled') === 'on',
      label: String(formData.get('adLabel') ?? 'آگهی').trim(),
      href: String(formData.get('adHref') ?? '/advertise/').trim(),
      text: String(formData.get('adText') ?? '').trim(),
    };
  }

  await writeCms(cms);

  return context.redirect(`/admin/?saved=1&tab=${encodeURIComponent(tab)}`, 302);
};