import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import { io as ioClient, type Socket as ClientSocket } from 'socket.io-client';
import { buildApp } from '../src/app.js';
import { loadConfig } from '../src/config.js';
import { pool } from '../src/db/pool.js';
import { drizzle } from 'drizzle-orm/node-postgres';
import { agents, apiTokens, rooms, roomMembers } from '../src/db/schema.js';
import { generateApiToken, hashApiToken } from '../src/lib/crypto.js';
import type { FastifyInstance } from 'fastify';

describe('socket.io /agents namespace', () => {
  let app: FastifyInstance;
  let serverPort: number;
  let agent1Id: string;
  let agent2Id: string;
  let roomId: string;
  let jwt1: string;
  let jwt2: string;

  beforeAll(async () => {
    const config = loadConfig({
      NODE_ENV: 'test',
      LOG_LEVEL: 'fatal',
      HOST: '127.0.0.1',
      PORT: '3001',
      POSTGRES_HOST: process.env.POSTGRES_HOST || 'localhost',
      POSTGRES_PORT: process.env.POSTGRES_PORT || '5432',
      POSTGRES_USER: process.env.POSTGRES_USER || 'agenthub',
      POSTGRES_PASSWORD: process.env.POSTGRES_PASSWORD || 'agenthub',
      POSTGRES_DB: process.env.POSTGRES_DB || 'agenthub',
      JWT_SECRET: 'test-secret-with-exactly-32chars',
    });
    app = await buildApp({ config });
    await app.listen({ host: '127.0.0.1', port: 0 });
    const address = app.server.address();
    if (!address || typeof address === 'string') {
      throw new Error('Failed to get server port');
    }
    serverPort = address.port;

    // Setup test data
    const db = drizzle(pool);

    // Create agents
    const [a1] = await db
      .insert(agents)
      .values({
        name: 'test-agent-1',
        displayName: 'Test Agent 1',
        role: 'agent',
      })
      .returning();
    if (!a1) throw new Error('Failed to create agent 1');
    agent1Id = a1.id;

    const [a2] = await db
      .insert(agents)
      .values({
        name: 'test-agent-2',
        displayName: 'Test Agent 2',
        role: 'agent',
      })
      .returning();
    if (!a2) throw new Error('Failed to create agent 2');
    agent2Id = a2.id;

    // Create room
    const [r] = await db
      .insert(rooms)
      .values({
        slug: 'test-room',
        name: 'Test Room',
        createdBy: agent1Id,
      })
      .returning();
    if (!r) throw new Error('Failed to create room');
    roomId = r.id;

    // Add both agents to room
    await db.insert(roomMembers).values([
      { roomId, agentId: agent1Id },
      { roomId, agentId: agent2Id },
    ]);

    // Create API tokens
    const token1 = generateApiToken();
    const hash1 = await hashApiToken(token1.fullToken);
    await db.insert(apiTokens).values({
      agentId: agent1Id,
      hashArgon2id: hash1,
      prefix: token1.prefix,
      scopes: {},
      status: 'active',
    });

    const token2 = generateApiToken();
    const hash2 = await hashApiToken(token2.fullToken);
    await db.insert(apiTokens).values({
      agentId: agent2Id,
      hashArgon2id: hash2,
      prefix: token2.prefix,
      scopes: {},
      status: 'active',
    });

    // Exchange for JWTs
    const res1 = await app.inject({
      method: 'POST',
      url: '/api/v1/sessions',
      payload: { apiToken: token1.fullToken },
    });
    jwt1 = JSON.parse(res1.body).jwt;

    const res2 = await app.inject({
      method: 'POST',
      url: '/api/v1/sessions',
      payload: { apiToken: token2.fullToken },
    });
    jwt2 = JSON.parse(res2.body).jwt;
  });

  afterAll(async () => {
    await app.close();
  });

  it('should connect with valid JWT and receive agent:hello-ack', async () => {
    return new Promise<void>((resolve, reject) => {
      const client = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
        auth: { jwt: jwt1 },
      });

      client.on('agent:hello-ack', (payload) => {
        try {
          expect(payload.agentId).toBe(agent1Id);
          expect(payload.rooms).toContain(roomId);
          client.disconnect();
          resolve();
        } catch (err) {
          reject(err);
        }
      });

      client.on('connect_error', (err) => {
        reject(err);
      });

      setTimeout(() => reject(new Error('Timeout waiting for hello-ack')), 5000);
    });
  });

  it('should reject connection with missing JWT', async () => {
    return new Promise<void>((resolve, reject) => {
      const client = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
        auth: {},
      });

      client.on('connect', () => {
        client.disconnect();
        reject(new Error('Should not connect without JWT'));
      });

      client.on('connect_error', (err) => {
        expect(err.message).toContain('Missing JWT');
        client.disconnect();
        resolve();
      });

      setTimeout(() => reject(new Error('Timeout waiting for error')), 5000);
    });
  });

  it('should reject connection with invalid JWT', async () => {
    return new Promise<void>((resolve, reject) => {
      const client = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
        auth: { jwt: 'invalid-jwt' },
      });

      client.on('connect', () => {
        client.disconnect();
        reject(new Error('Should not connect with invalid JWT'));
      });

      client.on('connect_error', (err) => {
        expect(err.message).toContain('Invalid or expired JWT');
        client.disconnect();
        resolve();
      });

      setTimeout(() => reject(new Error('Timeout waiting for error')), 5000);
    });
  });

  it('should emit presence:update when two agents join the same room', async () => {
    return new Promise<void>((resolve, reject) => {
      let client1: ClientSocket | null = null;
      let client2: ClientSocket | null = null;

      // Connect client 1
      client1 = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
        auth: { jwt: jwt1 },
      });

      client1.on('agent:hello-ack', () => {
        // Connect client 2
        client2 = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
          auth: { jwt: jwt2 },
        });
      });

      // Client 1 should receive presence update from client 2
      client1.on('presence:update', (payload) => {
        try {
          expect(payload.agentId).toBe(agent2Id);
          expect(payload.status).toBe('online');
          client1?.disconnect();
          client2?.disconnect();
          resolve();
        } catch (err) {
          reject(err);
        }
      });

      client1.on('connect_error', (err) => reject(err));

      setTimeout(() => {
        client1?.disconnect();
        client2?.disconnect();
        reject(new Error('Timeout waiting for presence update'));
      }, 5000);
    });
  });

  it('should emit error when trying to join non-member room', async () => {
    return new Promise<void>((resolve, reject) => {
      const client = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
        auth: { jwt: jwt1 },
      });

      client.on('agent:hello-ack', () => {
        // Try to join a non-existent room
        client.emit('room:join', {
          roomId: '00000000-0000-0000-0000-000000000000',
          requestId: 'test-req-1',
        });
      });

      client.on('error', (payload) => {
        try {
          expect(payload.code).toBe('forbidden');
          expect(payload.requestId).toBe('test-req-1');
          client.disconnect();
          resolve();
        } catch (err) {
          reject(err);
        }
      });

      setTimeout(() => {
        client.disconnect();
        reject(new Error('Timeout waiting for error'));
      }, 5000);
    });
  });

  it('should send and receive messages in real-time', async () => {
    return new Promise<void>((resolve, reject) => {
      let client1: ClientSocket | null = null;
      let client2: ClientSocket | null = null;
      let receivedByClient2 = false;
      let receivedEchoByClient1 = false;
      const messageBody = 'Hello from agent 1!';
      let _messageId: string | null = null;

      // Connect client 1
      client1 = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
        auth: { jwt: jwt1 },
      });

      // Connect client 2
      client2 = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
        auth: { jwt: jwt2 },
      });

      // Client 2 listens for new messages
      client2.on('message:new', (payload) => {
        try {
          expect(payload.authorAgentId).toBe(agent1Id);
          expect(payload.roomId).toBe(roomId);
          expect(payload.body).toBe(messageBody);
          expect(payload.id).toBeTruthy();
          _messageId = payload.id;
          receivedByClient2 = true;

          // Both clients received the message?
          if (receivedEchoByClient1 && receivedByClient2) {
            client1?.disconnect();
            client2?.disconnect();
            resolve();
          }
        } catch (err) {
          reject(err);
        }
      });

      // Client 1 also receives the echo
      client1.on('message:new', (payload) => {
        try {
          expect(payload.authorAgentId).toBe(agent1Id);
          expect(payload.roomId).toBe(roomId);
          expect(payload.body).toBe(messageBody);
          receivedEchoByClient1 = true;

          if (receivedByClient2 && receivedEchoByClient1) {
            client1?.disconnect();
            client2?.disconnect();
            resolve();
          }
        } catch (err) {
          reject(err);
        }
      });

      // Once both connected, send message
      let connectedCount = 0;
      const onBothConnected = () => {
        connectedCount++;
        if (connectedCount === 2) {
          // Wait a bit to ensure both are subscribed
          setTimeout(() => {
            client1?.emit(
              'message:send',
              {
                roomId,
                body: messageBody,
              },
              (ack: any) => {
                try {
                  expect(ack.messageId).toBeTruthy();
                  expect(ack.error).toBeUndefined();
                } catch (err) {
                  reject(err);
                }
              },
            );
          }, 100);
        }
      };

      client1.on('agent:hello-ack', onBothConnected);
      client2.on('agent:hello-ack', onBothConnected);

      setTimeout(() => {
        client1?.disconnect();
        client2?.disconnect();
        reject(new Error('Timeout waiting for message delivery'));
      }, 5000);
    });
  });

  it('should retrieve message history via REST after reconnection', async () => {
    return new Promise<void>(async (resolve, reject) => {
      try {
        let client1: ClientSocket | null = null;
        let messageId: string | null = null;

        // Connect and send a message
        client1 = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
          auth: { jwt: jwt1 },
        });

        await new Promise<void>((res, rej) => {
          client1!.on('agent:hello-ack', () => {
            client1!.emit(
              'message:send',
              {
                roomId,
                body: 'Test message for history',
              },
              (ack: any) => {
                if (ack.error) {
                  rej(new Error(ack.error));
                } else {
                  messageId = ack.messageId;
                  res();
                }
              },
            );
          });

          setTimeout(() => rej(new Error('Timeout sending message')), 2000);
        });

        // Disconnect
        client1.disconnect();

        // Wait a bit
        await new Promise((res) => setTimeout(res, 200));

        // Now fetch history via REST
        const res = await app.inject({
          method: 'GET',
          url: `/rooms/${roomId}/messages`,
          headers: {
            'x-agent-id': agent1Id,
          },
        });

        expect(res.statusCode).toBe(200);
        const body = JSON.parse(res.body);
        expect(body.messages).toBeDefined();
        expect(Array.isArray(body.messages)).toBe(true);
        expect(body.messages.length).toBeGreaterThan(0);

        // Find our message
        const ourMessage = body.messages.find((m: any) => m.id === messageId);
        expect(ourMessage).toBeDefined();
        expect(ourMessage.body).toBe('Test message for history');
        expect(ourMessage.authorAgentId).toBe(agent1Id);

        resolve();
      } catch (err) {
        reject(err);
      }
    });
  });

  it('should list rooms via WebSocket room:list event', async () => {
    return new Promise<void>((resolve, reject) => {
      const client = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
        auth: { jwt: jwt1 },
      });

      client.on('agent:hello-ack', () => {
        client.emit('room:list', { requestId: 'test-room-list' }, (ack: any) => {
          try {
            expect(ack.error).toBeUndefined();
            expect(ack.rooms).toBeDefined();
            expect(Array.isArray(ack.rooms)).toBe(true);
            expect(ack.rooms.length).toBeGreaterThan(0);

            // Find our test room
            const testRoom = ack.rooms.find((r: any) => r.id === roomId);
            expect(testRoom).toBeDefined();
            expect(testRoom.slug).toBe('test-room');
            expect(testRoom.name).toBe('Test Room');

            client.disconnect();
            resolve();
          } catch (err) {
            client.disconnect();
            reject(err);
          }
        });
      });

      client.on('connect_error', (err) => reject(err));

      setTimeout(() => {
        client.disconnect();
        reject(new Error('Timeout waiting for room:list'));
      }, 5000);
    });
  });

  it('should retrieve message history via WebSocket message:history event', async () => {
    return new Promise<void>(async (resolve, reject) => {
      try {
        let client1: ClientSocket | null = null;
        let messageId: string | null = null;

        // Connect and send a message
        client1 = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
          auth: { jwt: jwt1 },
        });

        await new Promise<void>((res, rej) => {
          client1!.on('agent:hello-ack', () => {
            client1!.emit(
              'message:send',
              {
                roomId,
                body: 'Test WebSocket history retrieval',
              },
              (ack: any) => {
                if (ack.error) {
                  rej(new Error(ack.error));
                } else {
                  messageId = ack.messageId;
                  res();
                }
              },
            );
          });

          setTimeout(() => rej(new Error('Timeout sending message')), 2000);
        });

        // Wait a bit for the message to be persisted
        await new Promise((res) => setTimeout(res, 100));

        // Now fetch history via WebSocket
        await new Promise<void>((res, rej) => {
          client1!.emit(
            'message:history',
            {
              roomId,
              limit: 50,
              requestId: 'test-history-req',
            },
            (ack: any) => {
              try {
                expect(ack.error).toBeUndefined();
                expect(ack.messages).toBeDefined();
                expect(Array.isArray(ack.messages)).toBe(true);
                expect(ack.messages.length).toBeGreaterThan(0);
                expect(ack.hasMore).toBeDefined();
                expect(typeof ack.hasMore).toBe('boolean');

                // Find our message
                const ourMessage = ack.messages.find((m: any) => m.id === messageId);
                expect(ourMessage).toBeDefined();
                expect(ourMessage.body).toBe('Test WebSocket history retrieval');
                expect(ourMessage.authorAgentId).toBe(agent1Id);
                expect(ourMessage.roomId).toBe(roomId);

                res();
              } catch (err) {
                rej(err);
              }
            },
          );

          setTimeout(() => rej(new Error('Timeout fetching history')), 2000);
        });

        client1.disconnect();
        resolve();
      } catch (err) {
        reject(err);
      }
    });
  });

  it('should return error when requesting history for non-member room', async () => {
    return new Promise<void>((resolve, reject) => {
      const client = ioClient(`http://127.0.0.1:${serverPort}/agents`, {
        auth: { jwt: jwt1 },
      });

      client.on('agent:hello-ack', () => {
        client.emit(
          'message:history',
          {
            roomId: '00000000-0000-0000-0000-000000000000',
            requestId: 'test-history-forbidden',
          },
          (ack: any) => {
            try {
              expect(ack.error).toBeDefined();
              expect(ack.error).toBe('Not a member of this room');
              client.disconnect();
              resolve();
            } catch (err) {
              client.disconnect();
              reject(err);
            }
          },
        );
      });

      setTimeout(() => {
        client.disconnect();
        reject(new Error('Timeout waiting for error'));
      }, 5000);
    });
  });
});