import { createClient } from '@supabase/supabase-js';
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const SUPABASE_URL = process.env.SUPABASE_URL || 'http://127.0.0.1:54321';
const SUPABASE_SERVICE_KEY = process.env.SUPABASE_SERVICE_ROLE_KEY;

if (!SUPABASE_SERVICE_KEY) {
  console.error('❌ SUPABASE_SERVICE_ROLE_KEY is required (set it in backend/.env). Refusing to run with a hardcoded fallback.');
  process.exit(1);
}

const supabase = createClient(SUPABASE_URL, SUPABASE_SERVICE_KEY);

async function executeSql(sql) {
  try {
    const { error } = await supabase.rpc('sql', { query: sql });
    if (error) throw error;
  } catch (err) {
    // Try with pg_query if available, otherwise use REST fallback
    console.error('SQL execution fallback:', err.message);
  }
}

async function applyMigration() {
  console.log('🚀 Applying database migration...');
  
  const migrationFile = path.join(__dirname, '../supabase/migrations/20260819064500_create_sessions_messages.sql');
  const sql = fs.readFileSync(migrationFile, 'utf-8');
  
  const statements = sql.split(';').map(s => s.trim()).filter(s => s && !s.startsWith('--'));
  
  for (const stmt of statements) {
    try {
      console.log(`✓ ${stmt.substring(0, 60)}...`);
      await executeSql(stmt);
    } catch (err) {
      console.error(`✗ Failed: ${err.message}`);
    }
  }
  
  console.log('✅ Migration complete!');
}

applyMigration().catch(err => {
  console.error('❌ Migration failed:', err);
  process.exit(1);
});