import { mkdtemp, rm, writeFile } from 'node:fs/promises';
import { createServer, type Server } from 'node:net';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { Writable } from 'node:stream';

import { pino } from 'pino';
import { afterEach, describe, expect, it, vi } from 'vitest';

import {
  IBootstrapService,
  IFileSystemStorageService,
  IHostRequestHeaders,
  InMemoryStorageService,
  IOAuthToolkit,
  ITelemetryService,
  noopTelemetryService,
} from '@moonshot-ai/agent-core-v2';

import { listLiveServerInstances } from '../src/instanceRegistry';
import { listenWithPortRetry, type RunningServer, startServer } from '../src/start';
import { TEST_HOST_IDENTITY } from './helpers/hostIdentity';
import { authedFetch } from './helpers/auth';

describe('server-v2 boot', () => {
  let server: RunningServer | undefined;
  let home: string | undefined;

  afterEach(async () => {
    if (server !== undefined) {
      await server.close();
      server = undefined;
    }
    if (home !== undefined) {
      await rm(home, { recursive: true, force: true });
      home = undefined;
    }
  });

  it('boots agent-core-v2 and serves the basic /api/v1 routes', async () => {
    home = await mkdtemp(join(tmpdir(), 'kimi-server-v2-'));
    server = await startServer({
      hostIdentity: TEST_HOST_IDENTITY,
      host: '127.0.0.1',
      port: 0,
      homeDir: home,
      logLevel: 'silent',
    });

    const base = `http://127.0.0.1:${server.port}`;

    const healthz = await fetch(`${base}/api/v1/healthz`);
    expect(healthz.status).toBe(200);
    const healthBody = await healthz.json() as {
      code: number;
      data: { ok: boolean };
      request_id: string;
    };
    expect(healthBody.code).toBe(0);
    expect(healthBody.data.ok).toBe(true);
    expect(typeof healthBody.request_id).toBe('string');

    const meta = await authedFetch(server, base, '/api/v1/meta');
    expect(meta.status).toBe(200);
    const metaBody = await meta.json() as {
      code: number;
      data: { server_id: string; server_version: string; capabilities: Record<string, boolean> };
    };
    expect(metaBody.code).toBe(0);
    expect(typeof metaBody.data.server_id).toBe('string');
    expect(typeof metaBody.data.server_version).toBe('string');
    expect(metaBody.data.capabilities).toBeDefined();

    const auth = await authedFetch(server, base, '/api/v1/auth');
    expect(auth.status).toBe(200);
    const authBody = await auth.json() as {
      code: number;
      data: { models_ready: boolean; providers_count: number };
    };
    expect(authBody.code).toBe(0);
    expect(typeof authBody.data.models_ready).toBe('boolean');
    expect(authBody.data.providers_count).toBeGreaterThanOrEqual(0);

    const oauthPoll = await authedFetch(server, base, '/api/v1/oauth/login');
    expect(oauthPoll.status).toBe(200);
    const oauthBody = await oauthPoll.json() as { code: number; data: null };
    expect(oauthBody.code).toBe(0);
    expect(oauthBody.data).toBeNull();
  });

  it('reports opts.serverVersion as server_version instead of the package version', async () => {
    home = await mkdtemp(join(tmpdir(), 'kimi-server-v2-version-'));
    server = await startServer({
      hostIdentity: {
        productName: 'test-host',
        version: '9.9.9-host',
        platform: 'test_platform',
      },
      host: '127.0.0.1',
      port: 0,
      homeDir: home,
      logLevel: 'silent',
      serverVersion: '9.9.9-host',
    });

    const base = `http://127.0.0.1:${server.port}`;
    const meta = await authedFetch(server, base, '/api/v1/meta');
    const metaBody = await meta.json() as {
      code: number;
      data: { server_version: string };
    };
    expect(metaBody.data.server_version).toBe('9.9.9-host');

    const [instance] = await listLiveServerInstances(home);
    expect(instance?.serverVersion).toBe('9.9.9-host');

    const defaults = server.core.accessor.get(IHostRequestHeaders);
    expect(defaults.headers['User-Agent']).toBe('test-host/9.9.9-host');
    expect(server.core.accessor.get(IBootstrapService).clientIdentity).toEqual({
      productName: 'test-host',
      version: '9.9.9-host',
      platform: 'test_platform',
    });
  });

  it('seeds default Kimi identity headers from hostIdentity that opts.seeds can override', async () => {
    home = await mkdtemp(join(tmpdir(), 'kimi-server-v2-ua-'));
    server = await startServer({
      hostIdentity: TEST_HOST_IDENTITY,
      host: '127.0.0.1',
      port: 0,
      homeDir: home,
      logLevel: 'silent',
    });
    const defaults = server.core.accessor.get(IHostRequestHeaders);
    expect(defaults.headers['User-Agent']).toBe('test-host/0.0.0-test');
    expect(defaults.headers['X-Msh-Version']).toBe('0.0.0-test');
    expect(defaults.headers['X-Msh-Platform']).toBe('test_platform');

    await server.close();
    server = undefined;
    server = await startServer({
      hostIdentity: TEST_HOST_IDENTITY,
      host: '127.0.0.1',
      port: 0,
      homeDir: home,
      logLevel: 'silent',
      seeds: [[IHostRequestHeaders, { headers: { 'User-Agent': 'custom-host/9.9' } }]],
    });
    const overridden = server.core.accessor.get(IHostRequestHeaders);
    expect(overridden.headers['User-Agent']).toBe('custom-host/9.9');
  });

  it('seeds explicit skill dirs into the core scope when skillDirs is provided', async () => {
    home = await mkdtemp(join(tmpdir(), 'kimi-server-v2-skills-'));
    server = await startServer({
      hostIdentity: TEST_HOST_IDENTITY,
      host: '127.0.0.1',
      port: 0,
      homeDir: home,
      logLevel: 'silent',
      skillDirs: ['/skills/explicit'],
    });
    expect(server.core.accessor.get(IBootstrapService).args.skillDirs).toEqual([
      '/skills/explicit',
    ]);

    await server.close();
    server = undefined;
    server = await startServer({
      hostIdentity: TEST_HOST_IDENTITY,
      host: '127.0.0.1',
      port: 0,
      homeDir: home,
      logLevel: 'silent',
    });
    expect(server.core.accessor.get(IBootstrapService).args.skillDirs).toBeUndefined();
  });

  it('does not shut down a host-injected telemetry service when server telemetry is disabled', async () => {
    home = await mkdtemp(join(tmpdir(), 'kimi-server-v2-host-telemetry-'));
    await writeFile(join(home, 'config.toml'), 'telemetry = false\n', 'utf8');
    const shutdown = vi.fn(async () => {});

    server = await startServer({
      hostIdentity: TEST_HOST_IDENTITY,
      host: '127.0.0.1',
      port: 0,
      homeDir: home,
      logLevel: 'silent',
      seeds: [[ITelemetryService, { ...noopTelemetryService, shutdown }]],
    });

    await server.close();
    server = undefined;

    expect(shutdown).not.toHaveBeenCalled();
  });

  it('completes server cleanup when owned telemetry shutdown fails', async () => {
    home = await mkdtemp(join(tmpdir(), 'kimi-server-v2-telemetry-failure-'));
    const storage = new InMemoryStorageService();
    const write = storage.write.bind(storage);
    vi.spyOn(storage, 'write').mockImplementation(async (scope, key, data, options) => {
      if (scope === 'telemetry') throw new Error('telemetry storage unavailable');
      await write(scope, key, data, options);
    });
    const auth = {
      _serviceBrand: undefined,
      getCachedAccessToken: async () => {
        throw new Error('telemetry auth unavailable');
      },
    } as unknown as IOAuthToolkit;

    server = await startServer({
      hostIdentity: TEST_HOST_IDENTITY,
      host: '127.0.0.1',
      port: 0,
      homeDir: home,
      logLevel: 'silent',
      telemetry: true,
      seeds: [
        [IFileSystemStorageService, storage],
        [IOAuthToolkit, auth],
      ],
    });
    const core = server.core;
    core.accessor.get(ITelemetryService).track2('session_ended', { reason: 'exit' });

    await server.close();
    server = undefined;

    expect(() => core.accessor.get(IBootstrapService)).toThrow();
    expect(await listLiveServerInstances(home)).toEqual([]);
  });

  it('logs process-level exceptions without exiting and removes the handlers on close', async () => {
    home = await mkdtemp(join(tmpdir(), 'kimi-server-v2-'));
    const lines: string[] = [];
    const stream = new Writable({
      write(chunk, _encoding, callback) {
        lines.push(String(chunk));
        callback();
      },
    });
    const rejectionBefore = process.listeners('unhandledRejection');
    const exceptionBefore = process.listeners('uncaughtException');
    server = await startServer({
      hostIdentity: TEST_HOST_IDENTITY,
      host: '127.0.0.1',
      port: 0,
      homeDir: home,
      logger: pino({ level: 'error' }, stream),
    });

    expect(process.listenerCount('unhandledRejection')).toBe(rejectionBefore.length + 1);
    expect(process.listenerCount('uncaughtException')).toBe(exceptionBefore.length + 1);

    const onUncaughtException = process
      .listeners('uncaughtException')
      .find((listener) => !exceptionBefore.includes(listener)) as
      | ((error: Error) => void)
      | undefined;
    const onUnhandledRejection = process
      .listeners('unhandledRejection')
      .find((listener) => !rejectionBefore.includes(listener)) as
      | ((reason: unknown) => void)
      | undefined;
    expect(onUncaughtException).toBeDefined();
    expect(onUnhandledRejection).toBeDefined();

    onUncaughtException?.(new Error('synthetic uncaught'));
    onUnhandledRejection?.(new Error('synthetic rejection'));

    const output = lines.join('');
    expect(output).toContain('"msg":"uncaughtException"');
    expect(output).toContain('"msg":"unhandledRejection"');

    const healthz = await fetch(`http://127.0.0.1:${server.port}/api/v1/healthz`);
    expect(healthz.status).toBe(200);

    await server.close();
    server = undefined;

    expect(process.listenerCount('unhandledRejection')).toBe(rejectionBefore.length);
    expect(process.listenerCount('uncaughtException')).toBe(exceptionBefore.length);
  });

  it('does not leave process handlers installed when startup fails', async () => {
    home = await mkdtemp(join(tmpdir(), 'kimi-server-v2-'));
    const emptyAssets = await mkdtemp(join(tmpdir(), 'kimi-server-v2-assets-'));
    const rejectionBefore = process.listenerCount('unhandledRejection');
    const exceptionBefore = process.listenerCount('uncaughtException');
    try {
      await expect(
        startServer({
          hostIdentity: TEST_HOST_IDENTITY,
          host: '127.0.0.1',
          port: 0,
          homeDir: home,
          logLevel: 'silent',
          webAssetsDir: emptyAssets,
        }),
      ).rejects.toThrow('web assets');
      expect(process.listenerCount('unhandledRejection')).toBe(rejectionBefore);
      expect(process.listenerCount('uncaughtException')).toBe(exceptionBefore);
    } finally {
      await rm(emptyAssets, { recursive: true, force: true });
    }
  });
});

function silentLogger() {
  return pino({ level: 'silent' });
}

function addrInUse(): NodeJS.ErrnoException {
  const err = new Error('listen EADDRINUSE') as NodeJS.ErrnoException;
  err.code = 'EADDRINUSE';
  return err;
}

function listenOnPort(host: string, port: number): Promise<Server> {
  return new Promise((resolve, reject) => {
    const server = createServer();
    server.once('error', reject);
    server.listen({ host, port }, () => resolve(server));
  });
}

function closeNetServer(server: Server): Promise<void> {
  return new Promise((resolve) => server.close(() => resolve()));
}

async function allocateAdjacentFreePair(
  host = '127.0.0.1',
): Promise<{ port: number; next: number }> {
  for (let i = 0; i < 30; i++) {
    const a = await listenOnPort(host, 0);
    const address = a.address();
    const port = typeof address === 'object' && address !== null ? address.port : 0;
    await closeNetServer(a);
    if (port <= 0 || port >= 65535) continue;
    const probe = await listenOnPort(host, port + 1).catch(() => null);
    if (probe === null) continue;
    await closeNetServer(probe);
    return { port, next: port + 1 };
  }
  throw new Error('could not allocate an adjacent free port pair');
}

describe('listenWithPortRetry', () => {
  it('returns the requested port when the first listen succeeds', async () => {
    const attempts: number[] = [];
    const result = await listenWithPortRetry({
      listen: async (_host, port) => {
        attempts.push(port);
        return `http://127.0.0.1:${String(port)}`;
      },
      host: '127.0.0.1',
      port: 5000,
      logger: silentLogger(),
    });

    expect(result.port).toBe(5000);
    expect(attempts).toEqual([5000]);
  });

  it('retries with port+1 on EADDRINUSE until a bind succeeds', async () => {
    const attempts: number[] = [];
    const result = await listenWithPortRetry({
      listen: async (_host, port) => {
        attempts.push(port);
        if (port < 5002) throw addrInUse();
        return `http://127.0.0.1:${String(port)}`;
      },
      host: '127.0.0.1',
      port: 5000,
      logger: silentLogger(),
    });

    expect(result.port).toBe(5002);
    expect(result.address).toBe('http://127.0.0.1:5002');
    expect(attempts).toEqual([5000, 5001, 5002]);
  });

  it('does not retry on non-EADDRINUSE errors', async () => {
    const attempts: number[] = [];
    const boom = Object.assign(new Error('listen EACCES'), { code: 'EACCES' });
    await expect(
      listenWithPortRetry({
        listen: async (_host, port) => {
          attempts.push(port);
          throw boom;
        },
        host: '127.0.0.1',
        port: 5000,
        logger: silentLogger(),
      }),
    ).rejects.toBe(boom);
    expect(attempts).toEqual([5000]);
  });

  it('throws after exhausting maxRetries', async () => {
    const attempts: number[] = [];
    await expect(
      listenWithPortRetry({
        listen: async (_host, port) => {
          attempts.push(port);
          throw addrInUse();
        },
        host: '127.0.0.1',
        port: 5000,
        logger: silentLogger(),
        maxRetries: 3,
      }),
    ).rejects.toMatchObject({ code: 'EADDRINUSE' });
    expect(attempts).toEqual([5000, 5001, 5002, 5003]);
  });

  it('does not walk ports when the requested port is 0 (ephemeral)', async () => {
    const attempts: number[] = [];
    const result = await listenWithPortRetry({
      listen: async (_host, port) => {
        attempts.push(port);
        return 'http://127.0.0.1:54321';
      },
      host: '127.0.0.1',
      port: 0,
      logger: silentLogger(),
    });

    expect(result.port).toBe(0);
    expect(attempts).toEqual([0]);
  });
});

describe('server-v2 boot — port retry', () => {
  let server: RunningServer | undefined;
  let home: string | undefined;

  afterEach(async () => {
    if (server !== undefined) {
      await server.close();
      server = undefined;
    }
    if (home !== undefined) {
      await rm(home, { recursive: true, force: true });
      home = undefined;
    }
  });

  it('retries on port+1 and advertises the bound port in the instance registry', async () => {
    home = await mkdtemp(join(tmpdir(), 'kimi-server-v2-port-retry-'));
    const { port, next } = await allocateAdjacentFreePair();
    const occupant = await listenOnPort('127.0.0.1', port);
    try {
      server = await startServer({
        hostIdentity: TEST_HOST_IDENTITY,
        host: '127.0.0.1',
        port,
        homeDir: home,
        logLevel: 'silent',
      });

      expect(server.port).toBeGreaterThanOrEqual(next);
      const [instance] = await listLiveServerInstances(home);
      expect(instance?.port).toBe(server.port);
    } finally {
      await closeNetServer(occupant);
    }
  });
});