import { createClient } from '@supabase/supabase-js';
import { NextResponse } from 'next/server';

export async function GET() {
  try {
    // Get environment variables inside the handler (important for Vercel)
    const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
    const supabaseServiceKey = process.env.SUPABASE_SERVICE_ROLE_KEY;

    // Validate environment variables
    if (!supabaseUrl) {
      console.error('Missing NEXT_PUBLIC_SUPABASE_URL environment variable');
      return NextResponse.json(
        { error: 'Server configuration error: Missing Supabase URL' },
        { status: 500 }
      );
    }

    if (!supabaseServiceKey) {
      console.error('Missing SUPABASE_SERVICE_ROLE_KEY environment variable');
      return NextResponse.json(
        { error: 'Server configuration error: Missing Supabase service key' },
        { status: 500 }
      );
    }

    const supabase = createClient(supabaseUrl, supabaseServiceKey, {
      auth: {
        autoRefreshToken: false,
        persistSession: false,
      },
    });

    const { data, error } = await supabase
      .from('mission_control_documents')
      .select('*')
      .order('updated_at', { ascending: false });

    if (error) {
      console.error('Supabase error:', error);
      return NextResponse.json({ error: error.message }, { status: 500 });
    }

    return NextResponse.json({ documents: data || [] });
  } catch (err: any) {
    console.error('API error:', err);
    return NextResponse.json(
      { error: err.message || 'Unknown error occurred' },
      { status: 500 }
    );
  }
}