import type { Command } from 'commander';
import { loadConfigSafe, getConfigPath } from './shared.js';
import { existsSync } from 'fs';

export function registerStartCommand(program: Command): void {
  program
    .command('start')
    .description('Start the Flynn daemon')
    .option('-c, --config <path>', 'Config file path')
    .action(async (opts: { config?: string }) => {
      const configPath = opts.config ?? getConfigPath();

      if (!existsSync(configPath)) {
        console.error(`Config file not found: ${configPath}`);
        console.error('Run "flynn doctor" to diagnose, or create a config at ~/.config/flynn/config.yaml');
        process.exit(1);
      }

      console.log('Flynn starting...');
      console.log(`Loading config from: ${configPath}`);

      const { config, error } = loadConfigSafe(configPath);
      if (!config) {
        console.error(error);
        process.exit(1);
      }

      // Dynamic import to avoid loading daemon code for other commands
      const { startDaemon } = await import('../daemon/index.js');
      const daemon = await startDaemon(config);

      console.log(`Allowed Telegram chat IDs: ${config.telegram.allowed_chat_ids.join(', ')}`);

      // Keep process alive
      await new Promise<void>((resolve) => {
        daemon.lifecycle.onShutdown(async () => resolve());
      });
    });
}