const request = require("supertest");
const socketIoClient = require("socket.io-client");
const jwt = require("jsonwebtoken");
const app = require("../server");
const User = require("../models/User");
const Event = require("../models/Event");
const Post = require("../models/Post");
const { generateTestId } = require('./utils/idGenerator');

describe("Socket.IO Real-time Features", () => {
  let server;
  let io;
  let clientSocket;
  let testUser;
  let authToken;

  beforeAll(async () => {
    // Start server
    server = app.listen(0); // Use random port
    io = app.get("io");

    // Create test user
    testUser = await User.create({
      name: "Test User",
      email: "test@example.com",
      password: "password123",
    });

    // Generate auth token
    authToken = jwt.sign(
      { user: { id: testUser._id } },
      process.env.JWT_SECRET || "test_secret"
    );
  });

  afterAll(async () => {
    if (clientSocket) {
      clientSocket.disconnect();
    }
    server.close();
  });

  beforeEach((done) => {
    // Connect client socket with authentication
    clientSocket = socketIoClient(`http://localhost:${server.address().port}`, {
      auth: { token: authToken },
    });

    clientSocket.on("connect", () => {
      done();
    });

    clientSocket.on("connect_error", (err) => {
      done(err);
    });
  });

  afterEach(() => {
    if (clientSocket && clientSocket.connected) {
      clientSocket.disconnect();
    }
  });

  describe("Socket Authentication", () => {
    test("should connect with valid token", (done) => {
      expect(clientSocket.connected).toBe(true);
      done();
    });

    test("should reject connection with invalid token", (done) => {
      const invalidSocket = socketIoClient(
        `http://localhost:${server.address().port}`,
        {
          auth: { token: "invalid_token" },
        }
      );

      invalidSocket.on("connect_error", (err) => {
        expect(err.message).toBe("Authentication error: Invalid token");
        invalidSocket.disconnect();
        done();
      });
    });

    test("should reject connection without token", (done) => {
      const noTokenSocket = socketIoClient(
        `http://localhost:${server.address().port}`
      );

      noTokenSocket.on("connect_error", (err) => {
        expect(err.message).toBe("Authentication error: No token provided");
        noTokenSocket.disconnect();
        done();
      });
    });
  });

  describe("Event Participation", () => {
    let testEvent;

    beforeEach(async () => {
      testEvent = await Event.create({
        title: "Test Event",
        description: "Test Description",
        date: new Date(Date.now() + 86400000), // Tomorrow
        location: "Test Location",
        participants: [],
      });
    });

    test("should join event room", (done) => {
      clientSocket.emit("joinEvent", testEvent._id.toString());

      // Verify socket joined room by checking server logs
      setTimeout(() => {
        // The socket should have joined the event room
        expect(clientSocket.rooms.has(`event_${testEvent._id}`)).toBe(true);
        done();
      }, 100);
    });

    test("should receive event updates in room", (done) => {
      clientSocket.emit("joinEvent", testEvent._id.toString());

      // Listen for updates
      clientSocket.on("update", (data) => {
        expect(data).toBe("Event status updated to ongoing");
        done();
      });

      // Simulate event update
      setTimeout(() => {
        clientSocket.emit("eventUpdate", {
          eventId: testEvent._id.toString(),
          message: "Event status updated to ongoing",
        });
      }, 100);
    });

    test("should not receive updates for events not joined", (done) => {
      const anotherEventId = generateTestId();

      // Listen for updates (should not receive any)
      let updateReceived = false;
      clientSocket.on("update", () => {
        updateReceived = true;
      });

      // Send update for event not joined
      setTimeout(() => {
        clientSocket.emit("eventUpdate", {
          eventId: anotherEventId,
          message: "This should not be received",
        });

        // Check after delay that no update was received
        setTimeout(() => {
          expect(updateReceived).toBe(false);
          done();
        }, 100);
      }, 100);
    });
  });

  describe("Post Interactions", () => {
    let testPost;

    beforeEach(async () => {
      testPost = await Post.create({
        user: {
          userId: testUser._id,
          name: testUser.name,
        },
        content: "Test post content",
        likes: [],
        commentsCount: 0,
      });
    });

    test("should join post room", (done) => {
      clientSocket.emit("joinPost", testPost._id.toString());

      setTimeout(() => {
        expect(clientSocket.rooms.has(`post_${testPost._id}`)).toBe(true);
        done();
      }, 100);
    });

    test("should handle multiple room joins", (done) => {
      Event.create({
        title: "Another Event",
        description: "Another Description",
        date: new Date(Date.now() + 86400000),
        location: "Another Location",
        participants: [],
      }).then((testEvent) => {
        clientSocket.emit("joinEvent", testEvent._id.toString());
        clientSocket.emit("joinPost", testPost._id.toString());

        setTimeout(() => {
          expect(clientSocket.rooms.has(`event_${testEvent._id}`)).toBe(true);
          expect(clientSocket.rooms.has(`post_${testPost._id}`)).toBe(true);
          done();
        }, 100);
      });
    });
  });

  describe("Connection Stability", () => {
    test("should handle disconnection gracefully", (done) => {
      const disconnectSpy = jest.spyOn(console, "log");
      
      clientSocket.disconnect();
      
      setTimeout(() => {
        expect(disconnectSpy).toHaveBeenCalledWith(
          expect.stringContaining("Client disconnected:")
        );
        disconnectSpy.mockRestore();
        done();
      }, 100);
    });

    test("should maintain connection under load", async () => {
      const startTime = Date.now();
      const messageCount = 100;
      
      for (let i = 0; i < messageCount; i++) {
        await new Promise((resolve) => {
          clientSocket.emit("eventUpdate", {
            eventId: generateTestId(),
            message: `Test message ${i}`,
          });
          setTimeout(resolve, 10);
        });
      }
      
      const endTime = Date.now();
      const duration = endTime - startTime;
      
      // Should complete within reasonable time (less than 5 seconds)
      expect(duration).toBeLessThan(5000);
      expect(clientSocket.connected).toBe(true);
    });
  });

  describe("Concurrent Connections", () => {
    test("should handle multiple simultaneous connections", async () => {
      const clients = [];
      const connectionPromises = [];

      // Create 10 concurrent connections
      for (let i = 0; i < 10; i++) {
        const promise = new Promise((resolve) => {
          const client = socketIoClient(
            `http://localhost:${server.address().port}`,
            {
              auth: { token: authToken },
            }
          );

          client.on("connect", () => {
            clients.push(client);
            resolve();
          });

          client.on("connect_error", (err) => {
            resolve(err);
          });
        });

        connectionPromises.push(promise);
      }

      await Promise.all(connectionPromises);

      // All connections should succeed
      expect(clients.length).toBe(10);
      clients.forEach((client) => {
        expect(client.connected).toBe(true);
      });

      // Clean up
      clients.forEach((client) => client.disconnect());
    });
  });
});