/* eslint-env mocha */
import { expect } from 'chai';
import sinon from 'sinon';
import { Meteor } from 'meteor/meteor';
import { Accounts } from 'meteor/accounts-base';

describe('attachmentApi authentication', function() {
  let findOneStub, hashStub;

  beforeEach(function() {
    hashStub = sinon.stub(Accounts, '_hashLoginToken');
    findOneStub = sinon.stub(Meteor.users, 'findOne');
  });

  afterEach(function() {
    if (hashStub) hashStub.restore();
    if (findOneStub) findOneStub.restore();
  });

  // Mock request/response objects
  function createMockReq(headers = {}) {
    return {
      headers,
      on: sinon.stub(),
      connection: { destroy: sinon.stub() },
    };
  }

  function createMockRes() {
    return {
      writeHead: sinon.stub(),
      end: sinon.stub(),
      headersSent: false,
    };
  }

  describe('authenticateApiRequest', function() {
    it('denies request with missing X-User-Id header', function() {
      const req = createMockReq({ 'x-auth-token': 'sometoken' });
      const res = createMockRes();

      // Simulate the handler behavior
      let errorThrown = false;
      try {
        if (!req.headers['x-user-id'] || !req.headers['x-auth-token']) {
          throw new Meteor.Error('unauthorized', 'Missing X-User-Id or X-Auth-Token headers');
        }
      } catch (error) {
        errorThrown = true;
        expect(error.error).to.equal('unauthorized');
      }

      expect(errorThrown).to.equal(true);
    });

    it('denies request with missing X-Auth-Token header', function() {
      const req = createMockReq({ 'x-user-id': 'user123' });

      let errorThrown = false;
      try {
        if (!req.headers['x-user-id'] || !req.headers['x-auth-token']) {
          throw new Meteor.Error('unauthorized', 'Missing X-User-Id or X-Auth-Token headers');
        }
      } catch (error) {
        errorThrown = true;
        expect(error.error).to.equal('unauthorized');
      }

      expect(errorThrown).to.equal(true);
    });

    it('denies request with invalid token', function() {
      const userId = 'user123';
      const token = 'invalidtoken';
      const req = createMockReq({ 'x-user-id': userId, 'x-auth-token': token });

      hashStub.returns('hashedInvalidToken');
      findOneStub.returns(null); // No user found

      let errorThrown = false;
      try {
        const hashedToken = Accounts._hashLoginToken(token);
        const user = Meteor.users.findOne({
          _id: userId,
          'services.resume.loginTokens.hashedToken': hashedToken,
        });
        if (!user) {
          throw new Meteor.Error('unauthorized', 'Invalid credentials');
        }
      } catch (error) {
        errorThrown = true;
        expect(error.error).to.equal('unauthorized');
      }

      expect(errorThrown).to.equal(true);
      expect(hashStub.calledOnce).to.equal(true);
      expect(findOneStub.calledOnce).to.equal(true);
    });

    it('allows request with valid X-User-Id and X-Auth-Token', function() {
      const userId = 'user123';
      const token = 'validtoken';
      const req = createMockReq({ 'x-user-id': userId, 'x-auth-token': token });

      const hashedToken = 'hashedValidToken';
      hashStub.returns(hashedToken);
      findOneStub.returns({ _id: userId }); // User found

      let authenticatedUserId = null;
      try {
        const hashed = Accounts._hashLoginToken(token);
        const user = Meteor.users.findOne({
          _id: userId,
          'services.resume.loginTokens.hashedToken': hashed,
        });
        if (!user) {
          throw new Meteor.Error('unauthorized', 'Invalid credentials');
        }
        authenticatedUserId = userId;
      } catch (error) {
        // Should not throw
      }

      expect(authenticatedUserId).to.equal(userId);
      expect(hashStub.calledOnce).to.equal(true);
      expect(hashStub.calledWith(token)).to.equal(true);
      expect(findOneStub.calledOnce).to.equal(true);
      const queryArg = findOneStub.getCall(0).args[0];
      expect(queryArg._id).to.equal(userId);
      expect(queryArg['services.resume.loginTokens.hashedToken']).to.equal(hashedToken);
    });

    it('prevents identity spoofing by validating hashed token', function() {
      const victimId = 'victim-user-id';
      const attackerToken = 'attacker-token';
      const req = createMockReq({ 'x-user-id': victimId, 'x-auth-token': attackerToken });

      hashStub.returns('hashedAttackerToken');
      // Simulate victim exists but token doesn't match
      findOneStub.returns(null);

      let errorThrown = false;
      try {
        const hashed = Accounts._hashLoginToken(attackerToken);
        const user = Meteor.users.findOne({
          _id: victimId,
          'services.resume.loginTokens.hashedToken': hashed,
        });
        if (!user) {
          throw new Meteor.Error('unauthorized', 'Invalid credentials');
        }
      } catch (error) {
        errorThrown = true;
        expect(error.error).to.equal('unauthorized');
      }

      expect(errorThrown).to.equal(true);
    });
  });

  describe('request handler DoS prevention', function() {
    it('enforces timeout on hanging requests', function(done) {
      this.timeout(5000);
      
      const req = createMockReq({ 'x-user-id': 'user1', 'x-auth-token': 'token1' });
      const res = createMockRes();

      // Simulate timeout behavior
      const timeout = setTimeout(() => {
        if (!res.headersSent) {
          res.headersSent = true;
          res.writeHead(408, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ success: false, error: 'Request timeout' }));
        }
      }, 100); // Short timeout for test

      // Wait for timeout
      setTimeout(() => {
        expect(res.headersSent).to.equal(true);
        expect(res.writeHead.calledWith(408)).to.equal(true);
        clearTimeout(timeout);
        done();
      }, 150);
    });

    it('limits request body size', function() {
      const req = createMockReq({ 'x-user-id': 'user1', 'x-auth-token': 'token1' });
      let body = '';
      const limit = 50 * 1024 * 1024; // 50MB

      // Simulate exceeding limit
      body = 'a'.repeat(limit + 1);
      expect(body.length).to.be.greaterThan(limit);

      // Handler should destroy connection
      if (body.length > limit) {
        req.connection.destroy();
      }

      expect(req.connection.destroy.calledOnce).to.equal(true);
    });
  });
});