// ─── Chat Command ───────────────────────────────────────────────────────────
import { createInterface } from 'readline';
import { createRuntime } from '../state/factory.js';
import { EventRenderer } from '../renderers/index.js';
import type { Message } from '../../core/provider/index.js';
import { now, type HarnessEvent } from '../../core/events/index.js';

export async function chatCommand(opts: {
  provider: string;
  model?: string;
  skills: string[];
  verbose?: boolean;
  compact?: boolean;
}): Promise<void> {
  const renderer = new EventRenderer({ verbose: opts.verbose ?? false, compact: opts.compact ?? false });
  const { runtime, eventBus, provider } = await createRuntime(opts);

  eventBus.on((event) => renderer.render(event));

  const rl = createInterface({ input: process.stdin, output: process.stdout });
  const prompt = () => new Promise<string>((resolve) => rl.question('\x1b[36m❯\x1b[0m ', resolve));

  console.log(`\x1b[90mProvider: ${provider.label} | Type your message (Ctrl+C to exit)\x1b[0m\n`);

  const messages: Message[] = [{ role: 'system', content: 'You are a helpful AI assistant with access to tools.' }];

  while (true) {
    const input = await prompt();
    if (!input.trim()) continue;
    if (input.trim() === '/quit' || input.trim() === '/exit') break;

    messages.push({ role: 'user', content: input });

    eventBus.emit({ type: 'model.request.start', provider: provider.id, model: opts.model ?? 'default', timestamp: now() });
    const startMs = Date.now();

    try {
      for await (const event of provider.stream({
        model: opts.model ?? (await provider.listModels())[0]!.id,
        messages,
        tools: runtime ? undefined : undefined, // Tools available through runtime
      })) {
        if (event.type === 'text-delta') {
          process.stdout.write(event.text);
        } else if (event.type === 'finish') {
          const durationMs = Date.now() - startMs;
          eventBus.emit({ type: 'model.request.end', provider: provider.id, model: opts.model ?? 'default', usage: event.result.usage, durationMs, timestamp: now() });
          messages.push({ role: 'assistant', content: event.result.content });
          if (!event.result.content.endsWith('\n')) process.stdout.write('\n');
        }
      }
    } catch (err) {
      const errMsg = err instanceof Error ? err.message : String(err);
      console.error(`\x1b[31mError: ${errMsg}\x1b[0m`);
    }
    console.log();
  }

  rl.close();
  console.log('\x1b[90mGoodbye.\x1b[0m');
  process.exit(0);
}