import { WsClient } from '@/core/ws/client';
import type { WsEvent, WsConnectionState } from '@/core/ws/types';

jest.mock('@/core/auth/token-manager', () => ({
  tokenManager: {
    getAccessToken: jest.fn().mockResolvedValue('test-token'),
  },
}));

jest.mock('@/core/config', () => ({
  config: {
    wsBaseUrl: 'ws://localhost:8000/',
    ws: {
      reconnectMaxRetries: 3,
      reconnectBaseDelayMs: 10,
      reconnectMaxDelayMs: 100,
      heartbeatIntervalMs: 60000,
    },
  },
}));

// Mock WebSocket
class MockWebSocket {
  static OPEN = 1;
  static CLOSED = 3;
  static instances: MockWebSocket[] = [];

  readyState = MockWebSocket.OPEN;
  onopen: (() => void) | null = null;
  onmessage: ((event: { data: string }) => void) | null = null;
  onclose: (() => void) | null = null;
  onerror: (() => void) | null = null;
  sentMessages: string[] = [];

  constructor(public url: string) {
    MockWebSocket.instances.push(this);
    setTimeout(() => this.onopen?.(), 0);
  }

  send(data: string) {
    this.sentMessages.push(data);
  }

  close() {
    this.readyState = MockWebSocket.CLOSED;
  }

  simulateMessage(data: Record<string, unknown>) {
    this.onmessage?.({ data: JSON.stringify(data) });
  }
}

(global as Record<string, unknown>).WebSocket = MockWebSocket;

describe('WsClient', () => {
  afterEach(() => {
    jest.clearAllMocks();
    MockWebSocket.instances = [];
  });

  test('connects with token and conversation id in URL', async () => {
    const client = new WsClient('conv-123');

    const states: WsConnectionState[] = [];
    client.onStateChange((s) => states.push(s));

    await client.connect();
    await new Promise((r) => setTimeout(r, 10));

    expect(states).toContain('connecting');
    expect(states).toContain('connected');
    expect(MockWebSocket.instances[0]?.url).toBe(
      'ws://localhost:8000/ws/conversation/conv-123?token=test-token',
    );

    client.dispose();
  });

  test('maps server messages to domain events', async () => {
    const client = new WsClient('conv-123');
    const events: WsEvent[] = [];
    client.onEvent((e) => events.push(e));

    await client.connect();
    await new Promise((r) => setTimeout(r, 10));

    const ws = (client as unknown as { ws: MockWebSocket }).ws;

    ws.simulateMessage({
      type: 'connect',
      conversation_id: 'conv-123',
      data: { status: 'connected' },
      timestamp: '2026-01-01T00:00:00Z',
    });

    ws.simulateMessage({
      type: 'agent_response',
      conversation_id: 'conv-123',
      data: { text: 'Hello!', index: 0, total: 1 },
      timestamp: '2026-01-01T00:00:00Z',
    });

    expect(events).toHaveLength(2);
    expect(events[0]).toEqual({
      kind: 'connected',
      conversationId: 'conv-123',
    });
    expect(events[1]).toEqual({
      kind: 'agent_response',
      conversationId: 'conv-123',
      text: 'Hello!',
      index: 0,
      total: 1,
      isTransition: undefined,
      segmentIndex: undefined,
    });

    client.dispose();
  });

  test('sends text messages', async () => {
    const client = new WsClient('conv-123');

    await client.connect();
    await new Promise((r) => setTimeout(r, 10));

    client.sendText('Hi there');

    const ws = (client as unknown as { ws: MockWebSocket }).ws;
    expect(ws.sentMessages).toHaveLength(1);

    const sent = JSON.parse(ws.sentMessages[0]);
    expect(sent).toEqual({
      type: 'text',
      conversation_id: 'conv-123',
      data: { text: 'Hi there' },
    });

    client.dispose();
  });

  test('sends text with tts_this_turn when requested', async () => {
    const client = new WsClient('conv-123');

    await client.connect();
    await new Promise((r) => setTimeout(r, 10));

    client.sendText('Hello', { ttsThisTurn: true });

    const ws = (client as unknown as { ws: MockWebSocket }).ws;
    expect(ws.sentMessages).toHaveLength(1);

    const sent = JSON.parse(ws.sentMessages[0]);
    expect(sent).toEqual({
      type: 'text',
      conversation_id: 'conv-123',
      data: { text: 'Hello', tts_this_turn: true },
    });

    client.dispose();
  });

  test('ignores unknown message types without crashing', async () => {
    const client = new WsClient('conv-123');
    const events: WsEvent[] = [];
    client.onEvent((e) => events.push(e));

    await client.connect();
    await new Promise((r) => setTimeout(r, 10));

    const ws = (client as unknown as { ws: MockWebSocket }).ws;
    ws.simulateMessage({
      type: 'unknown_type' as string,
      conversation_id: 'conv-123',
      data: {},
      timestamp: '2026-01-01T00:00:00Z',
    });

    // Unknown types are silently ignored — no events emitted
    expect(events).toHaveLength(0);

    client.dispose();
  });
});