import { NextRequest, NextResponse } from 'next/server';
import { createClient } from '@/lib/supabase/server';
import { createAdminClient } from '@/lib/supabase/admin';
import { hybridAI } from '@/lib/ai/hybridRouter';

// ─── Pen name rotation ────────────────────────────────────────────────────────
const BB_PEN_NAMES = [
  'Michael Strand', 'David Harlow', 'Karen Fielding', 'James Mercer',
  'Peter Calloway', 'Sandra Voss', 'Brian Kowalski', 'Laura Pennington',
  'Thomas Reeves', 'Christine Vale', 'Marcus Webb', 'Ellen Forsythe',
];
const AV_PEN_NAMES = ['Rex Chandler', 'Dana Flux', 'Derek Wainwright', 'Sloane Rigging', 'Chip Crosspoint', 'Blair Presenter', 'Jordan Lumen'];

function pickPenName(siteId: number, recentNames: string[]): string {
  const pool = siteId === 2 ? AV_PEN_NAMES : BB_PEN_NAMES;
  // Avoid last 3 used names
  const available = pool.filter(n => !recentNames.slice(-3).includes(n));
  return available[Math.floor(Math.random() * available.length)] || pool[0];
}

// ─── Company extraction via Hybrid AI ────────────────────────────────────────
async function extractCompanies(title: string, content: string): Promise<Array<{ name: string; website_guess: string }>> {
  try {
    const text = `${title}\n\n${content}`.slice(0, 3000);
    const result = await hybridAI(
      [
        {
          role: 'system',
          content: 'Extract all company names, brand names, and product manufacturer names mentioned in this broadcast/AV industry article. Return ONLY a JSON array: [{"name":"Company Name","website_guess":"example.com"}]. Only include real companies. If none found, return [].',
        },
        { role: 'user', content: text },
      ],
      { maxTokens: 500, isBackground: true, priority: 6 }
    );
    const match = result.text.match(/\[[\s\S]*?\]/);
    if (match) {
      const parsed = JSON.parse(match[0]);
      return Array.isArray(parsed) ? parsed.filter((c: any) => c?.name && typeof c.name === 'string') : [];
    }
    return [];
  } catch { return []; }
}

// ─── Story generation via Hybrid AI ──────────────────────────────────────────
async function generateStory(companyName: string, sourceTitle: string, penName: string, siteName: string): Promise<{ title: string; excerpt: string; content: string; confidence: number }> {
  try {
    const result = await hybridAI(
      [
        {
          role: 'system',
          content: `You are ${penName}, a professional technology journalist writing for ${siteName}. Write an original news article. Rules: write in your own words, lead with the news hook, include relevant context, 300-600 words, professional journalistic tone, do not mention competitor publications, end with a brief company boilerplate paragraph.`,
        },
        {
          role: 'user',
          content: `Write a news article about ${companyName} in the ${siteName === 'AV Beat' ? 'professional AV integration' : 'broadcast technology'} industry. This was prompted by their mention in an article titled "${sourceTitle}". Return JSON: {"title":"...","excerpt":"...","content":"<p>...</p>","confidence":0.0-1.0}`,
        },
      ],
      { maxTokens: 1200, isBackground: true, priority: 4 }
    );
    const match = result.text.match(/\{[\s\S]*\}/);
    if (match) {
      const parsed = JSON.parse(match[0]);
      return { title: parsed.title || `${companyName}: Industry Update`, excerpt: parsed.excerpt || '', content: parsed.content || `<p>Coverage of ${companyName}.</p>`, confidence: parsed.confidence || 0.7 };
    }
  } catch {}
  return { title: `${companyName}: Industry Update`, excerpt: `An in-depth look at ${companyName}.`, content: `<p>This is an AI-drafted story about ${companyName}, prompted by their mention in "${sourceTitle}".</p>`, confidence: 0.5 };
}

// ─── GET ──────────────────────────────────────────────────────────────────────
export async function GET(request: NextRequest) {
  try {
    const supabase = await createClient();
    const { searchParams } = new URL(request.url);
    const action = searchParams.get('action');
    const tab = searchParams.get('tab') || 'queue';

    if (action === 'settings') {
      const [settingsRes, trackerSettingsRes] = await Promise.all([
        supabase.from('autopilot_settings').select('*').limit(1).single(),
        supabase.from('company_tracker_settings').select('*').limit(1).single(),
      ]);
      return NextResponse.json({ settings: settingsRes.data || {}, trackerSettings: trackerSettingsRes.data || {} });
    }

    if (tab === 'companies') {
      const { data, error } = await supabase.from('tracked_companies').select('*').order('mention_count', { ascending: false });
      if (error) return NextResponse.json({ error: error.message }, { status: 500 });
      return NextResponse.json({ companies: data || [] });
    }

    if (tab === 'crawl-log') {
      const { data, error } = await supabase.from('crawl_log').select('*').order('crawled_at', { ascending: false }).limit(100);
      if (error) return NextResponse.json({ error: error.message }, { status: 500 });
      return NextResponse.json({ logs: data || [] });
    }

    // Default: story queue
    const status = searchParams.get('status') || 'pending';
    const siteFilter = searchParams.get('site') || '';
    let query = supabase.from('auto_story_queue').select('*').order('created_at', { ascending: false });
    if (status !== 'all') query = query.eq('status', status);
    if (siteFilter) query = query.eq('site_id', parseInt(siteFilter));
    const { data, error } = await query;
    if (error) return NextResponse.json({ error: error.message }, { status: 500 });
    return NextResponse.json({ queue: data || [] });
  } catch (err: any) {
    return NextResponse.json({ error: err.message }, { status: 500 });
  }
}

// ─── POST ─────────────────────────────────────────────────────────────────────
export async function POST(request: NextRequest) {
  try {
    // Cron bypass: scheduled scans send x-cron-secret and run with service-role
    // privileges (RLS bypass) so the scan can read/write admin-protected tables.
    const cronSecret = request.headers.get('x-cron-secret');
    const isCron =
      !!process.env.CRON_SECRET && cronSecret === process.env.CRON_SECRET;
    const supabase = isCron ? createAdminClient() : await createClient();
    const body = await request.json();
    const { action } = body;

    if (action === 'update_settings') {
      const { autopilot_enabled, reminder_email, auto_story_global_enabled, max_stories_per_company_per_week, mention_threshold, auto_publish_enabled } = body;
      const { data: existing } = await supabase.from('autopilot_settings').select('id').limit(1).single();
      if (existing?.id) {
        await supabase.from('autopilot_settings').update({ autopilot_enabled, reminder_email, updated_at: new Date().toISOString() }).eq('id', existing.id);
      } else {
        await supabase.from('autopilot_settings').insert({ autopilot_enabled, reminder_email });
      }
      if (auto_story_global_enabled !== undefined || max_stories_per_company_per_week !== undefined || mention_threshold !== undefined || auto_publish_enabled !== undefined) {
        const { data: ts } = await supabase.from('company_tracker_settings').select('id').limit(1).single();
        const trackerUpdate: any = {};
        if (auto_story_global_enabled !== undefined) trackerUpdate.auto_story_global_enabled = auto_story_global_enabled;
        if (max_stories_per_company_per_week !== undefined) trackerUpdate.max_stories_per_company_per_week = max_stories_per_company_per_week;
        if (mention_threshold !== undefined) trackerUpdate.mention_threshold = mention_threshold;
        if (auto_publish_enabled !== undefined) trackerUpdate.auto_publish_enabled = auto_publish_enabled;
        if (ts?.id) await supabase.from('company_tracker_settings').update(trackerUpdate).eq('id', ts.id);
      }
      return NextResponse.json({ success: true });
    }

    if (action === 'add_company') {
      const { company_name, company_website, site_scope, auto_story_enabled, crawl_priority, notes } = body;
      const { data, error } = await supabase.from('tracked_companies').upsert({
        company_name, company_website, site_scope: site_scope || 'both',
        auto_story_enabled: auto_story_enabled !== false, crawl_priority: crawl_priority || 'standard', notes,
      }, { onConflict: 'company_name' }).select().single();
      if (error) return NextResponse.json({ error: error.message }, { status: 500 });
      return NextResponse.json({ company: data });
    }

    if (action === 'force_crawl') {
      const { company_id } = body;
      await supabase.from('tracked_companies').update({ next_crawl_scheduled: new Date().toISOString() }).eq('id', company_id);
      return NextResponse.json({ success: true });
    }

    if (action === 'scan') {
      const since = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000).toISOString();
      const [nativeRes, importedRes] = await Promise.all([
        supabase.from('native_articles').select('id, title, content, slug, site_id').eq('status', 'published').gte('published_at', since).order('published_at', { ascending: false }).limit(20),
        supabase.from('wp_imported_posts').select('id, title, content, wp_slug').eq('status', 'published').gte('wp_published_at', since).order('wp_published_at', { ascending: false }).limit(20),
      ]);

      const allArticles = [
        ...(nativeRes.data || []).map((a: any) => ({ ...a, source: 'native', site_id: a.site_id || 1 })),
        ...(importedRes.data || []).map((a: any) => ({ ...a, source: 'imported', site_id: 1 })),
      ];

      const { data: settings } = await supabase.from('company_tracker_settings').select('mention_threshold, auto_story_global_enabled, auto_publish_enabled, auto_publish_confidence_threshold').limit(1).single();
      const threshold = settings?.mention_threshold || 2;
      const autoPilot = settings?.auto_story_global_enabled !== false;
      const autoPublish = settings?.auto_publish_enabled || false;
      const confidenceThreshold = settings?.auto_publish_confidence_threshold || 0.85;

      let newCompaniesFound = 0;
      const recentPenNames: string[] = [];

      for (const article of allArticles) {
        const companies = await extractCompanies(article.title || '', article.content || '');
        for (const company of companies) {
          // Upsert into tracked_companies
          const { data: existing } = await supabase.from('tracked_companies').select('id, mention_count, auto_story_enabled, site_scope').eq('company_name', company.name).single();
          let companyId: string;
          let mentionCount = 1;
          let autoStoryEnabled = true;
          let siteScope = 'both';

          if (existing) {
            mentionCount = (existing.mention_count || 0) + 1;
            autoStoryEnabled = existing.auto_story_enabled;
            siteScope = existing.site_scope;
            companyId = existing.id;
            await supabase.from('tracked_companies').update({ mention_count: mentionCount, last_mentioned: new Date().toISOString() }).eq('id', companyId);
          } else {
            const { data: newCompany } = await supabase.from('tracked_companies').insert({
              company_name: company.name, company_website: company.website_guess || null,
              mention_count: 1, auto_story_enabled: true, site_scope: 'both',
            }).select('id').single();
            companyId = newCompany?.id;
            newCompaniesFound++;
          }

          // Only generate stories for companies meeting threshold
          if (mentionCount >= threshold && autoStoryEnabled && autoPilot && companyId) {
            // Check if we already have a recent story queued for this company
            const { count } = await supabase.from('auto_story_queue').select('id', { count: 'exact', head: true })
              .eq('company_id', companyId).gte('created_at', new Date(Date.now() - 7 * 24 * 60 * 60 * 1000).toISOString());
            if ((count || 0) >= 3) continue; // max 3 per week

            const siteId = article.site_id || 1;
            const siteName = siteId === 2 ? 'AV Beat' : 'Broadcast Beat';
            const penName = pickPenName(siteId, recentPenNames);
            recentPenNames.push(penName);

            const draft = await generateStory(company.name, article.title || '', penName, siteName);

            if (autoPublish && draft.confidence >= confidenceThreshold) {
              // Auto-publish
              const slug = draft.title.toLowerCase().replace(/[^a-z0-9\s-]/g, '').replace(/\s+/g, '-').trim() + '-auto-' + Date.now();
              const { data: published } = await supabase.from('native_articles').insert({
                slug, title: draft.title, excerpt: draft.excerpt, content: draft.content,
                author_name: penName, status: 'published', site_id: siteId,
                published_at: new Date().toISOString(),
              }).select('id').single();
              await supabase.from('auto_story_queue').insert({
                company_id: companyId, company_name: company.name, story_type: 'company_news',
                source_title: article.title, assigned_pen_name: penName, site_id: siteId,
                status: 'published', generated_title: draft.title, generated_content: draft.content,
                generated_excerpt: draft.excerpt, quality_confidence: draft.confidence,
                published_article_id: published?.id, reviewed_at: new Date().toISOString(),
              });
            } else {
              // Queue for review
              await supabase.from('auto_story_queue').insert({
                company_id: companyId, company_name: company.name, story_type: 'company_news',
                source_title: article.title, assigned_pen_name: penName, site_id: siteId,
                status: 'generated', generated_title: draft.title, generated_content: draft.content,
                generated_excerpt: draft.excerpt, quality_confidence: draft.confidence,
              });
            }
          }
        }
      }

      // Update autopilot scan stats
      const { data: apSettings } = await supabase.from('autopilot_settings').select('id').limit(1).single();
      if (apSettings?.id) {
        await supabase.from('autopilot_settings').update({
          last_scan_at: new Date().toISOString(),
          last_scan_articles_processed: allArticles.length,
          last_scan_companies_found: newCompaniesFound,
        }).eq('id', apSettings.id);
      }

      // Send reminder email if not autopilot
      const { data: apData } = await supabase.from('autopilot_settings').select('autopilot_enabled, reminder_email').limit(1).single();
      if (!apData?.autopilot_enabled && newCompaniesFound > 0) {
        const { data: queuedItems } = await supabase.from('auto_story_queue').select('company_name').eq('status', 'generated').order('created_at', { ascending: false }).limit(20);
        const companyNames = [...new Set((queuedItems || []).map((i: any) => i.company_name))];
        if (companyNames.length > 0) {
          fetch('/api/admin/company-coverage-reminder', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ companies: companyNames, count: companyNames.length, email: apData?.reminder_email || 'ryan.salazar@relevantmediaproperties.com' }),
          }).catch(() => {});
        }
      }

      return NextResponse.json({ success: true, articlesScanned: allArticles.length, newCompaniesFound });
    }

    return NextResponse.json({ error: 'Unknown action' }, { status: 400 });
  } catch (err: any) {
    return NextResponse.json({ error: err.message }, { status: 500 });
  }
}

// ─── PATCH — approve/reject/reassign story ────────────────────────────────────
export async function PATCH(request: NextRequest) {
  try {
    const supabase = await createClient();
    const { data: { user }, error: authError } = await supabase.auth.getUser();
    if (authError || !user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });

    const body = await request.json();
    const { id, action, pen_name, rejection_reason, site_id } = body;

    if (action === 'approve') {
      const { data: item } = await supabase.from('auto_story_queue').select('*').eq('id', id).single();
      if (!item) return NextResponse.json({ error: 'Not found' }, { status: 404 });

      const slug = (item.generated_title || 'story').toLowerCase().replace(/[^a-z0-9\s-]/g, '').replace(/\s+/g, '-').trim() + '-auto-' + Date.now();
      const { data: published } = await supabase.from('native_articles').insert({
        slug, title: item.generated_title, excerpt: item.generated_excerpt, content: item.generated_content,
        author_name: item.assigned_pen_name, status: 'published', site_id: item.site_id,
        published_at: new Date().toISOString(),
      }).select('id').single();

      await supabase.from('auto_story_queue').update({
        status: 'published', reviewed_by: user.id, reviewed_at: new Date().toISOString(),
        published_article_id: published?.id,
      }).eq('id', id);
      return NextResponse.json({ success: true });
    }

    if (action === 'reject') {
      await supabase.from('auto_story_queue').update({ status: 'rejected', reviewed_by: user.id, reviewed_at: new Date().toISOString(), rejection_reason: rejection_reason || null }).eq('id', id);
      return NextResponse.json({ success: true });
    }

    if (action === 'reassign_pen_name') {
      await supabase.from('auto_story_queue').update({ assigned_pen_name: pen_name }).eq('id', id);
      return NextResponse.json({ success: true });
    }

    if (action === 'reassign_site') {
      await supabase.from('auto_story_queue').update({ site_id }).eq('id', id);
      return NextResponse.json({ success: true });
    }

    if (action === 'toggle_company_auto_story') {
      const { company_id, enabled } = body;
      await supabase.from('tracked_companies').update({ auto_story_enabled: enabled }).eq('id', company_id);
      return NextResponse.json({ success: true });
    }

    if (action === 'delete_company') {
      const { company_id } = body;
      await supabase.from('tracked_companies').delete().eq('id', company_id);
      return NextResponse.json({ success: true });
    }

    // Legacy: publish/dismiss from old company_coverage_queue
    if (action === 'publish' || action === 'dismiss') {
      const { data: item } = await supabase.from('company_coverage_queue').select('*').eq('id', id).single();
      if (!item) return NextResponse.json({ error: 'Not found' }, { status: 404 });
      if (action === 'publish') {
        const slug = (item.ai_draft_title || 'story').toLowerCase().replace(/[^a-z0-9\s-]/g, '').replace(/\s+/g, '-').trim() + '-' + Date.now();
        await supabase.from('native_articles').insert({ slug, title: item.ai_draft_title, excerpt: item.ai_draft_excerpt, content: item.ai_draft_content, author_name: 'Editorial Team', status: 'published', published_at: new Date().toISOString() });
        await supabase.from('company_coverage_queue').update({ status: 'published' }).eq('id', id);
      } else {
        await supabase.from('company_coverage_queue').update({ status: 'dismissed' }).eq('id', id);
      }
      return NextResponse.json({ success: true });
    }

    return NextResponse.json({ error: 'Unknown action' }, { status: 400 });
  } catch (err: any) {
    return NextResponse.json({ error: err.message }, { status: 500 });
  }
}