import { Logger } from '@nestjs/common';
import { afterEach, describe, expect, it, vi } from 'vitest';
import { OpencodeService } from './opencode.service.js';

const API = 'http://172.24.0.1:9898';
const WS_PATH = '/home/krzyw/projects/sandbox/mesh-bot';
// the workspace UUID is regenerated on host restarts — only path/name/proxyPath matter
const WORKSPACE = {
  id: 'ws-uuid',
  path: WS_PATH,
  name: 'mesh-bot',
  status: 'ready',
  proxyPath: '/proxy/abc',
};

function json(body: unknown): Response {
  return { ok: true, status: 200, json: async () => body } as Response;
}

function timeoutError(): Error {
  return new DOMException('signal timed out', 'TimeoutError');
}

/** Fresh service with a clean env (creds unset by default — pass them explicitly). */
function makeService(env: Record<string, string> = {}): OpencodeService {
  process.env.OPENCODE_API = API;
  process.env.OPENCODE_WORKSPACE_PATH = WS_PATH;
  for (const k of ['OPENCODE_SESSION', 'OPENCODE_USER', 'OPENCODE_PASS'])
    delete process.env[k];
  Object.assign(process.env, env);
  return new OpencodeService();
}

function stubSleep(svc: OpencodeService): ReturnType<typeof vi.fn> {
  const sleep = vi.fn(async (_ms: number) => {});
  (svc as unknown as { sleep(ms: number): Promise<void> }).sleep = sleep;
  return sleep;
}

describe('OpencodeService.notify', () => {
  let fetchMock: ReturnType<typeof vi.fn>;

  beforeEach(() => {
    fetchMock = vi.fn();
    vi.stubGlobal('fetch', fetchMock);
  });

  afterEach(() => {
    vi.unstubAllGlobals();
    vi.restoreAllMocks();
    for (const k of [
      'OPENCODE_API',
      'OPENCODE_WORKSPACE_PATH',
      'OPENCODE_SESSION',
      'OPENCODE_USER',
      'OPENCODE_PASS',
    ])
      delete process.env[k];
  });

  it('posts the exact wrapper text with `from` (em-dash) to the resolved session', async () => {
    const svc = makeService({
      OPENCODE_USER: 'u',
      OPENCODE_PASS: 'p',
      OPENCODE_SESSION: 'ses_pinned',
    });
    fetchMock
      .mockResolvedValueOnce(json([WORKSPACE]))
      .mockResolvedValueOnce(json({}));

    await svc.notify(7, 'hi', 42);

    expect(fetchMock).toHaveBeenCalledTimes(2);
    const [url, init] = fetchMock.mock.calls[1];
    expect(url).toBe(`${API}/proxy/abc/api/session/ses_pinned/prompt`);
    const opts = init as {
      method?: string;
      headers?: Record<string, string>;
      body?: string;
    };
    expect(opts.method).toBe('POST');
    expect(opts.headers?.['content-type']).toBe('application/json');
    expect(opts.headers?.authorization).toBe(
      'Basic ' + Buffer.from('u:p').toString('base64'),
    );
    // body is EXACTLY {"text": msg} — em-dash, not a hyphen — and a 2xx resolves notify as delivered
    expect(String(opts.body)).toBe(
      JSON.stringify({
        text: 'New mesh message (id 7) from node 42: "hi" — please react to it.',
      }),
    );
  });

  it('omits the `from node` part when there is no sender', async () => {
    const svc = makeService({
      OPENCODE_USER: 'u',
      OPENCODE_PASS: 'p',
      OPENCODE_SESSION: 'ses_pinned',
    });
    fetchMock
      .mockResolvedValueOnce(json([WORKSPACE]))
      .mockResolvedValueOnce(json({}));

    await svc.notify(7, 'hi');

    const [, init] = fetchMock.mock.calls[1];
    expect(String((init as { body?: string }).body)).toBe(
      JSON.stringify({
        text: 'New mesh message (id 7): "hi" — please react to it.',
      }),
    );
  });

  it('matches the workspace by path, preferring ready entries when several match', async () => {
    const svc = makeService({
      OPENCODE_USER: 'u',
      OPENCODE_PASS: 'p',
      OPENCODE_SESSION: 'ses_pinned',
    });
    fetchMock.mockResolvedValueOnce(
      json([
        {
          ...WORKSPACE,
          id: 'other',
          status: 'starting',
          proxyPath: '/proxy/not-ready',
        }, // same path but not ready — listed first
        WORKSPACE,
        {
          id: 'x',
          name: 'mesh-bot',
          status: 'ready',
          proxyPath: '/proxy/other',
        }, // different path — must lose to the path match
      ]),
    );
    fetchMock.mockResolvedValueOnce(json({}));

    await svc.notify(7, 'hi');

    expect(fetchMock.mock.calls[1][0]).toBe(
      `${API}/proxy/abc/api/session/ses_pinned/prompt`,
    );
  });

  it('falls back to the workspace name when no path matches', async () => {
    const svc = makeService({
      OPENCODE_USER: 'u',
      OPENCODE_PASS: 'p',
      OPENCODE_SESSION: 'ses_pinned',
    });
    fetchMock.mockResolvedValueOnce(
      json([
        {
          id: 'a',
          path: '/elsewhere',
          name: 'other',
          status: 'ready',
          proxyPath: '/proxy/a',
        },
        {
          id: 'b',
          path: '/renamed',
          name: 'mesh-bot',
          status: 'ready',
          proxyPath: '/proxy/b',
        },
      ]),
    );
    fetchMock.mockResolvedValueOnce(json({}));

    await svc.notify(7, 'hi');

    expect(fetchMock.mock.calls[1][0]).toBe(
      `${API}/proxy/b/api/session/ses_pinned/prompt`,
    );
  });

  it('discovers the most recently updated session when none is pinned', async () => {
    const svc = makeService({ OPENCODE_USER: 'u', OPENCODE_PASS: 'p' });
    fetchMock
      .mockResolvedValueOnce(json([WORKSPACE]))
      .mockResolvedValueOnce(
        // v2 envelope {data, cursor}; the /elsewhere session is more recent but a different
        // directory, so the location.directory filter must exclude it
        json({
          data: [
            {
              id: 'ses_old',
              location: { directory: WS_PATH },
              time: { updated: 100 },
            },
            {
              id: 'ses_other_ws',
              location: { directory: '/elsewhere' },
              time: { updated: 300 },
            },
            {
              id: 'ses_new',
              location: { directory: WS_PATH },
              time: { updated: 200 },
            },
          ],
          cursor: { previous: null, next: null },
        }),
      )
      .mockResolvedValueOnce(json({}));

    await svc.notify(7, 'hi');

    // discovery GET hits the v2 route; the prompt POST goes to the most recently updated session of THIS directory
    expect(fetchMock.mock.calls[1][0]).toBe(`${API}/proxy/abc/api/session`);
    expect(fetchMock.mock.calls[2][0]).toBe(
      `${API}/proxy/abc/api/session/ses_new/prompt`,
    );
  });

  it('uses the first session when none carry time.updated', async () => {
    const svc = makeService({ OPENCODE_USER: 'u', OPENCODE_PASS: 'p' });
    fetchMock
      .mockResolvedValueOnce(json([WORKSPACE]))
      .mockResolvedValueOnce(
        json({
          data: [
            { id: 'ses_a', location: { directory: WS_PATH } },
            { id: 'ses_b', location: { directory: WS_PATH }, time: {} },
          ],
          cursor: { previous: null, next: null },
        }),
      )
      .mockResolvedValueOnce(json({}));

    await svc.notify(7, 'hi');

    expect(fetchMock.mock.calls[1][0]).toBe(`${API}/proxy/abc/api/session`);
    expect(fetchMock.mock.calls[2][0]).toBe(
      `${API}/proxy/abc/api/session/ses_a/prompt`,
    );
  });

  it('skips session discovery entirely when a session is pinned', async () => {
    const svc = makeService({
      OPENCODE_USER: 'u',
      OPENCODE_PASS: 'p',
      OPENCODE_SESSION: 'ses_pinned',
    });
    fetchMock
      .mockResolvedValueOnce(json([WORKSPACE]))
      .mockResolvedValueOnce(json({}));

    await svc.notify(7, 'hi');

    // workspaces GET + prompt POST only — no /api/session discovery GET
    expect(fetchMock).toHaveBeenCalledTimes(2);
    expect(fetchMock.mock.calls[0][0]).toBe(`${API}/api/workspaces`);
    expect(fetchMock.mock.calls[1][0]).toBe(
      `${API}/proxy/abc/api/session/ses_pinned/prompt`,
    );
  });

  it('treats a final-POST read timeout as delivered success and does not retry', async () => {
    const svc = makeService({
      OPENCODE_USER: 'u',
      OPENCODE_PASS: 'p',
      OPENCODE_SESSION: 'ses_pinned',
    });
    fetchMock
      .mockResolvedValueOnce(json([WORKSPACE]))
      .mockRejectedValueOnce(timeoutError()); // the prompt POST times out — a read timeout is still treated as delivered (safety net)

    const logSpy = vi.spyOn(Logger.prototype, 'log');
    await expect(svc.notify('hi')).resolves.toBeUndefined();

    // exactly 2 calls: no retry after a timeout-as-delivered
    expect(fetchMock).toHaveBeenCalledTimes(2);
    expect(logSpy.mock.calls.map((c) => String(c[0]))).toContain(
      'opencode notify accepted (response still pending after 15 s)',
    );
  });

  it('retries a failed workspace GET and succeeds on the next attempt', async () => {
    const svc = makeService({
      OPENCODE_USER: 'u',
      OPENCODE_PASS: 'p',
      OPENCODE_SESSION: 'ses_pinned',
    });
    const sleep = stubSleep(svc);
    fetchMock
      .mockRejectedValueOnce(new Error('boom')) // attempt 1: workspaces GET fails
      .mockResolvedValueOnce(json([WORKSPACE])) // attempt 2: workspaces ok
      .mockResolvedValueOnce(json({})); // message POST ok

    await expect(svc.notify('hi')).resolves.toBeUndefined();

    expect(fetchMock).toHaveBeenCalledTimes(3);
    expect(sleep).toHaveBeenNthCalledWith(1, 2_000);
  });

  it('gives up after 4 attempts and logs opencode notify dropped', async () => {
    const svc = makeService({ OPENCODE_USER: 'u', OPENCODE_PASS: 'p' });
    const sleep = stubSleep(svc);
    fetchMock.mockRejectedValue(new Error('down'));
    const warnSpy = vi.spyOn(Logger.prototype, 'warn');

    await expect(svc.notify('hi')).resolves.toBeUndefined(); // never throws — fire-and-forget safe

    // one workspaces GET per attempt: exactly 4 attempts total
    expect(fetchMock).toHaveBeenCalledTimes(4);
    expect(sleep).toHaveBeenNthCalledWith(1, 2_000);
    expect(sleep).toHaveBeenNthCalledWith(2, 10_000);
    expect(sleep).toHaveBeenNthCalledWith(3, 30_000);
    const warns = warnSpy.mock.calls.map((c) => String(c[0]));
    expect(warns.some((w) => w.includes('attempt 1/4'))).toBe(true);
    // the GET failure is wrapped with the URL for a clear reason — match prefix + cause
    expect(
      warns.some(
        (w) =>
          w.startsWith('opencode notify dropped after 4 attempts:') &&
          w.includes(': down'),
      ),
    ).toBe(true);
  });

  it('is a no-op without credentials (empty or unset)', async () => {
    for (const env of [{}, { OPENCODE_USER: '', OPENCODE_PASS: 'p' }] as Record<
      string,
      string
    >[]) {
      const svc = makeService(env);
      await expect(svc.notify(7, 'hi', 42)).resolves.toBeUndefined();
      expect(fetchMock).not.toHaveBeenCalled();
    }
  });

  it('logs once at construction when disabled', () => {
    const warnSpy = vi.spyOn(Logger.prototype, 'warn');
    makeService({}); // no creds
    expect(warnSpy.mock.calls.map((c) => String(c[0]))).toContain(
      'opencode notifier disabled: OPENCODE_USER/OPENCODE_PASS not set',
    );
  });
});