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

vi.mock('electron', () => ({
  app: {
    getPath: () => '/tmp',
    isPackaged: false,
  },
  utilityProcess: {
    fork: vi.fn(),
  },
}));

vi.mock('@electron/utils/logger', () => ({
  logger: {
    info: vi.fn(),
    warn: vi.fn(),
    error: vi.fn(),
    debug: vi.fn(),
  },
}));

describe('GatewayManager diagnostics', () => {
  const originalPlatform = process.platform;

  beforeEach(() => {
    vi.resetModules();
    vi.clearAllMocks();
    vi.useFakeTimers();
    vi.setSystemTime(new Date('2026-04-14T00:00:00.000Z'));
    Object.defineProperty(process, 'platform', { value: originalPlatform });
  });

  afterEach(() => {
    vi.useRealTimers();
    Object.defineProperty(process, 'platform', { value: originalPlatform });
  });

  it('updates diagnostics on gateway message, rpc success/timeout, and socket close', async () => {
    const { GatewayManager } = await import('@electron/gateway/manager');
    const manager = new GatewayManager();

    const ws = {
      readyState: 1,
      send: vi.fn(),
      ping: vi.fn(),
      terminate: vi.fn(),
      on: vi.fn(),
    };

    (manager as unknown as { ws: typeof ws }).ws = ws;

    (manager as unknown as { handleMessage: (message: unknown) => void }).handleMessage({
      type: 'event',
      event: 'gateway.ready',
      payload: {},
    });
    expect(manager.getDiagnostics().lastAliveAt).toBe(Date.now());

    const successPromise = manager.rpc<{ ok: boolean }>('chat.history', {}, 1000);
    const successRequestId = Array.from(
      (manager as unknown as { pendingRequests: Map<string, unknown> }).pendingRequests.keys(),
    )[0];
    (manager as unknown as { handleMessage: (message: unknown) => void }).handleMessage({
      type: 'res',
      id: successRequestId,
      ok: true,
      payload: { ok: true },
    });
    await expect(successPromise).resolves.toEqual({ ok: true });
    expect(manager.getDiagnostics().lastRpcSuccessAt).toBe(Date.now());
    expect(manager.getDiagnostics().consecutiveRpcFailures).toBe(0);

    const failurePromise = manager.rpc('chat.history', {}, 1000);
    vi.advanceTimersByTime(1001);
    await expect(failurePromise).rejects.toThrow('RPC timeout: chat.history');

    const diagnostics = manager.getDiagnostics();
    expect(diagnostics.lastRpcFailureAt).toBe(Date.now());
    expect(diagnostics.lastRpcFailureMethod).toBe('chat.history');
    expect(diagnostics.consecutiveRpcFailures).toBe(1);

    (manager as unknown as { recordSocketClose: (code: number) => void }).recordSocketClose(1006);
    expect(manager.getDiagnostics().lastSocketCloseAt).toBe(Date.now());
    expect(manager.getDiagnostics().lastSocketCloseCode).toBe(1006);
  });

  it('does not count gateway-declared rpc errors as transport failures', async () => {
    const { GatewayManager } = await import('@electron/gateway/manager');
    const { buildGatewayHealthSummary } = await import('@electron/utils/gateway-health');
    const manager = new GatewayManager();

    const ws = {
      readyState: 1,
      send: vi.fn(),
      ping: vi.fn(),
      terminate: vi.fn(),
      on: vi.fn(),
    };

    (manager as unknown as { ws: typeof ws }).ws = ws;
    (manager as unknown as { status: { state: string; port: number } }).status = {
      state: 'running',
      port: 18789,
    };

    const failurePromise = manager.rpc('channels.status', {}, 1000);
    const failureRequestId = Array.from(
      (manager as unknown as { pendingRequests: Map<string, unknown> }).pendingRequests.keys(),
    )[0];
    (manager as unknown as { handleMessage: (message: unknown) => void }).handleMessage({
      type: 'res',
      id: failureRequestId,
      ok: false,
      error: { message: 'channel unavailable' },
    });
    await expect(failurePromise).rejects.toThrow('channel unavailable');

    expect(manager.getDiagnostics().consecutiveRpcFailures).toBe(0);

    const health = buildGatewayHealthSummary({
      status: manager.getStatus(),
      diagnostics: manager.getDiagnostics(),
      platform: process.platform,
    });
    expect(health.reasons).not.toContain('rpc_timeout');
  });

  it('keeps windows heartbeat recovery disabled while diagnostics degrade', async () => {
    Object.defineProperty(process, 'platform', { value: 'win32' });

    const { GatewayManager } = await import('@electron/gateway/manager');
    const { buildGatewayHealthSummary } = await import('@electron/utils/gateway-health');
    const manager = new GatewayManager();

    const ws = {
      readyState: 1,
      send: vi.fn(),
      ping: vi.fn(),
      terminate: vi.fn(),
      on: vi.fn(),
    };

    (manager as unknown as { ws: typeof ws }).ws = ws;
    (manager as unknown as { shouldReconnect: boolean }).shouldReconnect = true;
    (manager as unknown as { status: { state: string; port: number } }).status = {
      state: 'running',
      port: 18789,
    };
    const restartSpy = vi.spyOn(manager, 'restart').mockResolvedValue();

    (manager as unknown as { startPing: () => void }).startPing();
    vi.advanceTimersByTime(400_000);

    expect(restartSpy).not.toHaveBeenCalled();

    const health = buildGatewayHealthSummary({
      status: manager.getStatus(),
      diagnostics: manager.getDiagnostics(),
      platform: 'win32',
    });
    expect(health.state).not.toBe('healthy');

    (manager as unknown as { connectionMonitor: { clear: () => void } }).connectionMonitor.clear();
  });
});