import { test, expect, describe, beforeEach } from "bun:test";
import { SignalingService } from "../src/services/SignalingService.ts";
import { ClientManager } from "../src/services/ClientManager.ts";
import type { ISignalingMessage } from "../src/interfaces/ISignalingMessage.ts";

class MockWebSocket {
  sentMessages: string[] = [];
  closed = false;

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

  close() {
    this.closed = true;
  }
}

describe("SignalingService", () => {
  let signalingService: SignalingService;
  let clientManager: ClientManager;
  let mockWs: MockWebSocket;

  beforeEach(() => {
    clientManager = new ClientManager();
    signalingService = new SignalingService(clientManager);
    mockWs = new MockWebSocket();
  });

  test("should handle publisher connection", () => {
    const clientId = signalingService.handleConnection(mockWs, "publisher");
    
    expect(typeof clientId).toBe("string");
    expect(clientId.length).toBeGreaterThan(0);
    expect(mockWs.sentMessages[0]).toBe(
      JSON.stringify({
        type: 'join',
        data: { clientId, role: 'publisher' }
      })
    );
    expect(clientManager.getPublisher()?.id).toBe(clientId);
  });

  test("should handle subscriber connection", () => {
    const clientId = signalingService.handleConnection(mockWs, "subscriber");
    
    expect(typeof clientId).toBe("string");
    expect(clientId.length).toBeGreaterThan(0);
    expect(mockWs.sentMessages[0]).toBe(
      JSON.stringify({
        type: 'join',
        data: { clientId, role: 'subscriber' }
      })
    );
    
    const subscribers = clientManager.getSubscribers();
    expect(subscribers).toHaveLength(1);
    expect(subscribers[0].id).toBe(clientId);
  });

  test("should handle disconnection", () => {
    const clientId = signalingService.handleConnection(mockWs, "publisher");
    expect(clientManager.getPublisher()).not.toBeNull();
    
    signalingService.handleDisconnection(clientId);
    expect(clientManager.getPublisher()).toBeNull();
  });

  test("should handle offer from publisher to subscribers", () => {
    // Add publisher
    const publisherId = signalingService.handleConnection(mockWs, "publisher");
    
    // Add subscribers
    const subscriber1Ws = new MockWebSocket();
    const subscriber2Ws = new MockWebSocket();
    signalingService.handleConnection(subscriber1Ws, "subscriber");
    signalingService.handleConnection(subscriber2Ws, "subscriber");

    const offerMessage: ISignalingMessage = {
      type: "offer",
      data: { sdp: "fake-offer-sdp", type: "offer" }
    };

    signalingService.handleMessage(publisherId, offerMessage);

    expect(subscriber1Ws.sentMessages).toContain(
      JSON.stringify({
        ...offerMessage,
        senderId: publisherId
      })
    );
    expect(subscriber2Ws.sentMessages).toContain(
      JSON.stringify({
        ...offerMessage,
        senderId: publisherId
      })
    );
  });

  test("should handle answer from subscriber to publisher", () => {
    // Add publisher
    const publisherWs = new MockWebSocket();
    const publisherId = signalingService.handleConnection(publisherWs, "publisher");
    
    // Add subscriber
    const subscriberWs = new MockWebSocket(); 
    const subscriberId = signalingService.handleConnection(subscriberWs, "subscriber");

    const answerMessage: ISignalingMessage = {
      type: "answer",
      data: { sdp: "fake-answer-sdp", type: "answer" }
    };

    signalingService.handleMessage(subscriberId, answerMessage);

    expect(publisherWs.sentMessages).toContain(
      JSON.stringify({
        ...answerMessage,
        senderId: subscriberId
      })
    );
  });

  test("should handle ice candidates from publisher to subscribers", () => {
    const publisherId = signalingService.handleConnection(mockWs, "publisher");
    
    const subscriberWs = new MockWebSocket();
    signalingService.handleConnection(subscriberWs, "subscriber");

    const iceCandidateMessage: ISignalingMessage = {
      type: "ice-candidate",
      data: { candidate: "fake-ice-candidate" }
    };

    signalingService.handleMessage(publisherId, iceCandidateMessage);

    expect(subscriberWs.sentMessages).toContain(
      JSON.stringify({
        ...iceCandidateMessage,
        senderId: publisherId
      })
    );
  });

  test("should handle ice candidates from subscriber to publisher", () => {
    const publisherWs = new MockWebSocket();
    const publisherId = signalingService.handleConnection(publisherWs, "publisher");
    
    const subscriberId = signalingService.handleConnection(mockWs, "subscriber");

    const iceCandidateMessage: ISignalingMessage = {
      type: "ice-candidate",
      data: { candidate: "fake-ice-candidate" }
    };

    signalingService.handleMessage(subscriberId, iceCandidateMessage);

    expect(publisherWs.sentMessages).toContain(
      JSON.stringify({
        ...iceCandidateMessage,
        senderId: subscriberId
      })
    );
  });

  test("should ignore messages from non-existent clients", () => {
    const message: ISignalingMessage = {
      type: "offer",
      data: { sdp: "fake-sdp" }
    };

    expect(() => {
      signalingService.handleMessage("non-existent-id", message);
    }).not.toThrow();
  });
});