/**
 * Live-LLM smoke for agent chat.
 *
 * Runs only when MCPCTL_SMOKE_LLM_URL + MCPCTL_SMOKE_LLM_KEY are set; the
 * idea is to point this at a real OpenAI-compatible endpoint and confirm
 * the openai-passthrough adapter delivers the user's message and returns
 * an assistant reply. For the project's qwen3-thinking deployment:
 *
 *   MCPCTL_SMOKE_LLM_URL=http://litellm.nvidia-nim.svc.cluster.local:4000/v1 \
 *   MCPCTL_SMOKE_LLM_MODEL=qwen3-thinking \
 *   MCPCTL_SMOKE_LLM_KEY=sk-... \
 *     pnpm test:smoke
 *
 * If the env vars are missing the test self-skips without failing the
 * pipeline (the agent CRUD smoke still runs in agent.smoke.test.ts).
 */
import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import http from 'node:http';
import https from 'node:https';
import { spawnSync, execSync } from 'node:child_process';

const MCPD_URL = process.env.MCPD_URL ?? 'https://mcpctl.ad.itaz.eu';
const LLM_URL = process.env.MCPCTL_SMOKE_LLM_URL;
const LLM_MODEL = process.env.MCPCTL_SMOKE_LLM_MODEL ?? 'qwen3-thinking';
const LLM_KEY = process.env.MCPCTL_SMOKE_LLM_KEY;
const SUFFIX = Date.now().toString(36);
const SECRET_NAME = `smoke-chat-sec-${SUFFIX}`;
const LLM_NAME = `smoke-chat-llm-${SUFFIX}`;
const AGENT_NAME = `smoke-chat-agent-${SUFFIX}`;

interface CliResult { code: number; stdout: string; stderr: string }

function run(args: string): CliResult {
  // spawnSync (not execSync) — execSync returns only stdout on success and
  // discards stderr, which made any `thread:` assertion against a successful
  // chat impossible to evaluate. Splitting the args correctly handles the
  // few existing call sites that quote-wrap multi-word values like
  // `--system-prompt "You are..."`.
  const argv = splitArgs(args);
  const res = spawnSync('mcpctl', ['--direct', ...argv], {
    encoding: 'utf-8',
    timeout: 60_000,
  });
  return {
    code: res.status ?? 1,
    stdout: (res.stdout ?? '').trim(),
    stderr: (res.stderr ?? '').trim(),
  };
}

/**
 * Tokenize a shell-style argv string with simple double-quote support — just
 * enough for the smoke test's call shapes. Not a full POSIX parser; we only
 * need to keep `--system-prompt "You are a smoke test..."` together as one
 * arg.
 */
function splitArgs(s: string): string[] {
  const out: string[] = [];
  const re = /"([^"]*)"|(\S+)/g;
  let m: RegExpExecArray | null;
  while ((m = re.exec(s)) !== null) {
    out.push(m[1] !== undefined ? m[1] : (m[2] ?? ''));
  }
  return out;
}

function healthz(url: string, timeoutMs = 5000): Promise<boolean> {
  return new Promise((resolve) => {
    const parsed = new URL(`${url.replace(/\/$/, '')}/healthz`);
    const driver = parsed.protocol === 'https:' ? https : http;
    const req = driver.get({
      hostname: parsed.hostname,
      port: parsed.port || (parsed.protocol === 'https:' ? 443 : 80),
      path: parsed.pathname,
      timeout: timeoutMs,
    }, (res) => { resolve((res.statusCode ?? 500) < 500); res.resume(); });
    req.on('error', () => resolve(false));
    req.on('timeout', () => { req.destroy(); resolve(false); });
  });
}

let mcpdUp = false;
const liveLlmConfigured = LLM_URL !== undefined && LLM_KEY !== undefined;

describe('agent chat smoke (live LLM)', () => {
  beforeAll(async () => {
    if (!liveLlmConfigured) {
      // eslint-disable-next-line no-console
      console.warn('\n  ○ agent-chat smoke: skipped — set MCPCTL_SMOKE_LLM_URL + MCPCTL_SMOKE_LLM_KEY to run against a real LLM.\n');
      return;
    }
    mcpdUp = await healthz(MCPD_URL);
    if (!mcpdUp) {
      // eslint-disable-next-line no-console
      console.warn(`\n  ○ agent-chat smoke: skipped — ${MCPD_URL}/healthz unreachable.\n`);
    }
  }, 20_000);

  afterAll(() => {
    if (!liveLlmConfigured || !mcpdUp) return;
    run(`delete agent ${AGENT_NAME}`);
    run(`delete llm ${LLM_NAME}`);
    run(`delete secret ${SECRET_NAME}`);
  });

  it('provisions secret + Llm + agent against the live endpoint', () => {
    if (!liveLlmConfigured || !mcpdUp) return;
    run(`delete secret ${SECRET_NAME}`);
    run(`delete llm ${LLM_NAME}`);
    run(`delete agent ${AGENT_NAME}`);
    const sec = run(`create secret ${SECRET_NAME} --data API_KEY=${LLM_KEY!}`);
    expect(sec.code, sec.stderr).toBe(0);
    const llm = run([
      `create llm ${LLM_NAME}`,
      '--type openai',
      `--model ${LLM_MODEL}`,
      `--url ${LLM_URL!}`,
      `--api-key-ref ${SECRET_NAME}/API_KEY`,
    ].join(' '));
    expect(llm.code, llm.stderr).toBe(0);
    const agent = run([
      `create agent ${AGENT_NAME}`,
      `--llm ${LLM_NAME}`,
      `--description "live chat smoke"`,
      `--system-prompt "You are a smoke test. Always reply with the single token READY."`,
      '--default-temperature 0',
      '--default-max-tokens 32',
    ].join(' '));
    expect(agent.code, agent.stderr).toBe(0);
  });

  it('one-shot `mcpctl chat` sends a message and prints a reply', () => {
    if (!liveLlmConfigured || !mcpdUp) return;
    const result = run(`chat ${AGENT_NAME} -m "ping" --no-stream`);
    expect(result.code, result.stderr).toBe(0);
    expect(result.stdout.length).toBeGreaterThan(0);
    // We can't bind too tightly to model output but the system prompt nudges
    // toward "READY". Either way: we got a reply.
    expect(result.stderr).toMatch(/thread:\s+c[a-z0-9]+/);
  });

  it('streaming `mcpctl chat` emits text deltas', () => {
    if (!liveLlmConfigured || !mcpdUp) return;
    // Default mode is streaming. Pipe stdout/stderr separately.
    let stdout = '';
    let stderr = '';
    try {
      const out = execSync(`mcpctl --direct chat ${AGENT_NAME} -m "say hello" 2> /tmp/agent-smoke-err`, {
        encoding: 'utf-8', timeout: 60_000,
      });
      stdout = out;
    } catch (err) {
      const e = err as { status?: number; stdout?: Buffer | string };
      stdout = e.stdout ? (typeof e.stdout === 'string' ? e.stdout : e.stdout.toString('utf-8')) : '';
    }
    try {
      // eslint-disable-next-line @typescript-eslint/no-require-imports
      const fs = require('node:fs') as typeof import('node:fs');
      stderr = fs.readFileSync('/tmp/agent-smoke-err', 'utf-8');
      fs.unlinkSync('/tmp/agent-smoke-err');
    } catch { /* ignore */ }
    expect(stdout.length).toBeGreaterThan(0);
    expect(stderr).toMatch(/thread:\s+c[a-z0-9]+/);
  });
});
