import { NextRequest, NextResponse } from 'next/server';
import { postgresClient } from '@/lib/services/postgres-client';

async function getExcludedCompanyIds(): Promise<number[]> {
  try {
    const result = await postgresClient.query(
      `SELECT setting_value FROM kiosk_settings WHERE setting_key = 'excluded_company_ids'`
    );
    const value = result.rows[0]?.setting_value || '';
    return value ? value.split(',').map((id: string) => parseInt(id.trim())).filter((id: number) => !isNaN(id)) : [];
  } catch (error) {
    console.error('Error fetching excluded company IDs:', error);
    return [];
  }
}

async function getExcludedClassifications(): Promise<string[]> {
  try {
    const result = await postgresClient.query(
      `SELECT setting_value FROM kiosk_settings WHERE setting_key = 'excluded_classifications'`
    );
    const value = result.rows[0]?.setting_value || '';
    return value ? value.split(',').map((c: string) => c.trim()).filter(Boolean) : [];
  } catch (error) {
    console.error('Error fetching excluded classifications:', error);
    return [];
  }
}

export async function GET(request: NextRequest) {
  try {
    // Get excluded company IDs (co-managed clients)
    const excludedCompanyIds = await getExcludedCompanyIds();
    const excludedClassifications = await getExcludedClassifications();
    
    // Build company exclusion filter
    let excludeCompanyFilter = '';
    if (excludedCompanyIds.length > 0 || excludedClassifications.length > 0) {
      const conditions = [];
      if (excludedCompanyIds.length > 0) {
        conditions.push(`company_id NOT IN (${excludedCompanyIds.join(',')})`);
      }
      if (excludedClassifications.length > 0) {
        const classificationList = excludedClassifications.map(c => `'${c.replace(/'/g, "''")}'`).join(',');
        conditions.push(`company_id NOT IN (SELECT id FROM companies WHERE classification IN (${classificationList}))`);
      }
      excludeCompanyFilter = `AND (${conditions.join(' AND ')})`;
    }

    // Critical tickets (Priority 1-3) - exclude RMM alerts (source = 8), co-managed clients, and excluded classifications
    const criticalTicketsResult = await postgresClient.query(
      `SELECT COUNT(*) as count 
       FROM tickets 
       WHERE completed_date IS NULL 
         AND priority <= 3
         AND (source IS NULL OR source != 8)
         ${excludeCompanyFilter}`
    );

    // Top 3 critical tickets
    const topCriticalResult = await postgresClient.query(
      `SELECT t.ticket_number, t.title, c.company_name, t.priority
       FROM tickets t
       LEFT JOIN companies c ON t.company_id = c.id
       WHERE t.completed_date IS NULL 
         AND t.priority <= 3
         AND (t.source IS NULL OR t.source != 8)
         ${excludeCompanyFilter}
       ORDER BY t.priority ASC, t.create_date ASC
       LIMIT 3`
    );

    // Tickets waiting engagement (specific statuses) - exclude RMM alerts
    const waitingTicketsResult = await postgresClient.query(
      `SELECT COUNT(*) as count 
       FROM tickets 
       WHERE completed_date IS NULL 
         AND status IN (21, 9, 19)
         AND (source IS NULL OR source != 8)
         ${excludeCompanyFilter}`
    );

    // Top 3 waiting tickets
    const topWaitingResult = await postgresClient.query(
      `SELECT t.ticket_number, t.title, c.company_name, t.last_activity_date
       FROM tickets t
       LEFT JOIN companies c ON t.company_id = c.id
       WHERE t.completed_date IS NULL 
         AND t.status IN (21, 9, 19)
         AND (t.source IS NULL OR t.source != 8)
         ${excludeCompanyFilter}
       ORDER BY t.last_activity_date ASC NULLS FIRST
       LIMIT 3`
    );

    // Stale tickets (no activity in 7+ days) - exclude RMM alerts
    const staleTicketsResult = await postgresClient.query(
      `SELECT COUNT(*) as count 
       FROM tickets 
       WHERE completed_date IS NULL 
         AND last_activity_date < NOW() - INTERVAL '7 days'
         AND (source IS NULL OR source != 8)
         ${excludeCompanyFilter}`
    );

    // Top 3 stale tickets (oldest activity first)
    const topStaleResult = await postgresClient.query(
      `SELECT t.ticket_number, t.title, c.company_name, t.last_activity_date
       FROM tickets t
       LEFT JOIN companies c ON t.company_id = c.id
       WHERE t.completed_date IS NULL 
         AND t.last_activity_date < NOW() - INTERVAL '7 days'
         AND (t.source IS NULL OR t.source != 8)
         ${excludeCompanyFilter}
       ORDER BY t.last_activity_date ASC NULLS FIRST
       LIMIT 3`
    );

    // Overdue tickets - exclude RMM alerts
    const overdueTicketsResult = await postgresClient.query(
      `SELECT COUNT(*) as count 
       FROM tickets 
       WHERE completed_date IS NULL 
         AND due_date_time < NOW()
         AND (source IS NULL OR source != 8)
         ${excludeCompanyFilter}`
    );

    // Top 3 overdue tickets (most overdue first)
    const topOverdueResult = await postgresClient.query(
      `SELECT t.ticket_number, t.title, c.company_name, t.due_date_time
       FROM tickets t
       LEFT JOIN companies c ON t.company_id = c.id
       WHERE t.completed_date IS NULL 
         AND t.due_date_time < NOW()
         AND (t.source IS NULL OR t.source != 8)
         ${excludeCompanyFilter}
       ORDER BY t.due_date_time ASC
       LIMIT 3`
    );

    // Total open tickets - exclude RMM alerts
    const openTicketsResult = await postgresClient.query(
      `SELECT COUNT(*) as count 
       FROM tickets 
       WHERE completed_date IS NULL
         AND (source IS NULL OR source != 8)
         ${excludeCompanyFilter}`
    );

    // Tickets closed today - exclude RMM alerts
    const closedTodayResult = await postgresClient.query(
      `SELECT COUNT(*) as count 
       FROM tickets 
       WHERE DATE(completed_date) = CURRENT_DATE
         AND (source IS NULL OR source != 8)
         ${excludeCompanyFilter}`
    );

    // Top 3 recently closed tickets
    const topClosedResult = await postgresClient.query(
      `SELECT t.ticket_number, t.title, c.company_name, t.completed_date
       FROM tickets t
       LEFT JOIN companies c ON t.company_id = c.id
       WHERE DATE(t.completed_date) = CURRENT_DATE
         AND (t.source IS NULL OR t.source != 8)
         ${excludeCompanyFilter}
       ORDER BY t.completed_date DESC
       LIMIT 3`
    );

    // Average resolution time (last 30 days) - exclude RMM alerts
    const avgResolutionResult = await postgresClient.query(
      `SELECT AVG(EXTRACT(EPOCH FROM (completed_date - create_date))/3600) as avg_hours
       FROM tickets 
       WHERE completed_date >= NOW() - INTERVAL '30 days'
         AND completed_date IS NOT NULL
         AND (source IS NULL OR source != 8)
         ${excludeCompanyFilter}`
    );

    // Time entries this week
    const timeEntriesResult = await postgresClient.query(
      `SELECT COALESCE(SUM(hours_worked), 0) as hours
       FROM time_entries 
       WHERE entry_date >= DATE_TRUNC('week', CURRENT_DATE)`
    );

    // Active companies
    const companiesResult = await postgresClient.query(
      `SELECT COUNT(*) as count 
       FROM companies 
       WHERE is_active = true AND company_type = 1`
    );

    // Quotes (if table exists)
    let quotesOpen = 0;
    try {
      const quotesResult = await postgresClient.query(
        `SELECT COUNT(*) as count 
         FROM quotes 
         WHERE status = 'open'`
      );
      quotesOpen = parseInt(quotesResult.rows[0]?.count || '0');
    } catch {
      // Quotes table may not exist
    }

    // NMS Coverage
    let nmsPercentage = 0;
    try {
      const nmsResult = await postgresClient.query(
        `SELECT 
          (SELECT COUNT(*) FROM auvik_tenant_mappings WHERE autotask_company_id IS NOT NULL) as mapped,
          (SELECT COUNT(*) FROM auvik_tenants) as total`
      );
      const mapped = parseInt(nmsResult.rows[0]?.mapped || '0');
      const total = parseInt(nmsResult.rows[0]?.total || '0');
      nmsPercentage = total > 0 ? Math.round((mapped / total) * 100) : 0;
    } catch {
      // Tables may not exist
    }

    // RMM Coverage
    let rmmPercentage = 0;
    try {
      const rmmResult = await postgresClient.query(
        `SELECT 
          (SELECT COUNT(*) FROM rmm_site_mappings WHERE company_id IS NOT NULL) as mapped,
          (SELECT COUNT(*) FROM rmm_sites) as total`
      );
      const mapped = parseInt(rmmResult.rows[0]?.mapped || '0');
      const total = parseInt(rmmResult.rows[0]?.total || '0');
      rmmPercentage = total > 0 ? Math.round((mapped / total) * 100) : 0;
    } catch {
      // Tables may not exist
    }

    const stats = {
      criticalTickets: parseInt(criticalTicketsResult.rows[0]?.count || '0'),
      topCritical: topCriticalResult.rows.map((r: any) => ({
        ticketNumber: r.ticket_number,
        title: r.title,
        companyName: r.company_name,
      })),
      waitingTickets: parseInt(waitingTicketsResult.rows[0]?.count || '0'),
      topWaiting: topWaitingResult.rows.map((r: any) => ({
        ticketNumber: r.ticket_number,
        title: r.title,
        companyName: r.company_name,
      })),
      staleTickets: parseInt(staleTicketsResult.rows[0]?.count || '0'),
      topStale: topStaleResult.rows.map((r: any) => ({
        ticketNumber: r.ticket_number,
        title: r.title,
        companyName: r.company_name,
      })),
      overdueTickets: parseInt(overdueTicketsResult.rows[0]?.count || '0'),
      topOverdue: topOverdueResult.rows.map((r: any) => ({
        ticketNumber: r.ticket_number,
        title: r.title,
        companyName: r.company_name,
      })),
      openTickets: parseInt(openTicketsResult.rows[0]?.count || '0'),
      closedToday: parseInt(closedTodayResult.rows[0]?.count || '0'),
      topClosed: topClosedResult.rows.map((r: any) => ({
        ticketNumber: r.ticket_number,
        title: r.title,
        companyName: r.company_name,
      })),
      avgResolutionHours: parseFloat(avgResolutionResult.rows[0]?.avg_hours || '0'),
      hoursThisWeek: parseFloat(timeEntriesResult.rows[0]?.hours || '0'),
      activeCompanies: parseInt(companiesResult.rows[0]?.count || '0'),
      openQuotes: quotesOpen,
      nmsCoverage: nmsPercentage,
      rmmCoverage: rmmPercentage,
    };

    return NextResponse.json(stats);
  } catch (error) {
    console.error('Error fetching kiosk stats:', error);
    return NextResponse.json(
      { error: 'Failed to fetch kiosk stats' },
      { status: 500 }
    );
  }
}