var jwt = require('../index');
var expect = require('chai').expect;
var jws = require('jws');
var PS_SUPPORTED = require('../lib/psSupported');
const {generateKeyPairSync} = require("crypto");

describe('signing a token asynchronously', function() {

  describe('when signing a token', function() {
    var secret = 'shhhhhh';

    it('should return the same result as singing synchronously', function(done) {
      jwt.sign({ foo: 'bar' }, secret, { algorithm: 'HS256' }, function (err, asyncToken) {
        if (err) return done(err);
        var syncToken = jwt.sign({ foo: 'bar' }, secret, { algorithm: 'HS256' });
        expect(asyncToken).to.be.a('string');
        expect(asyncToken.split('.')).to.have.length(3);
        expect(asyncToken).to.equal(syncToken);
        done();
      });
    });

    it('should work with empty options', function (done) {
      jwt.sign({abc: 1}, "secret", {}, function (err) {
        expect(err).to.be.null;
        done();
      });
    });

    it('should work without options object at all', function (done) {
      jwt.sign({abc: 1}, "secret", function (err) {
        expect(err).to.be.null;
        done();
      });
    });

    it('should work with none algorithm where secret is set', function(done) {
      jwt.sign({ foo: 'bar' }, 'secret', { algorithm: 'none' }, function(err, token) {
        expect(token).to.be.a('string');
        expect(token.split('.')).to.have.length(3);
        done();
      });
    });

    //Known bug: https://github.com/brianloveswords/node-jws/issues/62
    //If you need this use case, you need to go for the non-callback-ish code style.
    it.skip('should work with none algorithm where secret is falsy', function(done) {
      jwt.sign({ foo: 'bar' }, undefined, { algorithm: 'none' }, function(err, token) {
        expect(token).to.be.a('string');
        expect(token.split('.')).to.have.length(3);
        done();
      });
    });

    it('should return error when secret is not a cert for RS256', function(done) {
      //this throw an error because the secret is not a cert and RS256 requires a cert.
      jwt.sign({ foo: 'bar' }, secret, { algorithm: 'RS256' }, function (err) {
        expect(err).to.be.ok;
        done();
      });
    });

    it('should not work for RS algorithms when modulus length is less than 2048 when allowInsecureKeySizes is false or not set', function(done) {
      const { privateKey } = generateKeyPairSync('rsa', { modulusLength: 1024 });

      jwt.sign({ foo: 'bar' }, privateKey, { algorithm: 'RS256' }, function (err) {
        expect(err).to.be.ok;
        done();
      });
    });

    it('should work for RS algorithms when modulus length is less than 2048 when allowInsecureKeySizes is true', function(done) {
      const { privateKey } = generateKeyPairSync('rsa', { modulusLength: 1024 });

      jwt.sign({ foo: 'bar' }, privateKey, { algorithm: 'RS256', allowInsecureKeySizes: true }, done);
    });

    if (PS_SUPPORTED) {
      it('should return error when secret is not a cert for PS256', function(done) {
        //this throw an error because the secret is not a cert and PS256 requires a cert.
        jwt.sign({ foo: 'bar' }, secret, { algorithm: 'PS256' }, function (err) {
          expect(err).to.be.ok;
          done();
        });
      });
    }

    it('should return error on wrong arguments', function(done) {
      //this throw an error because the secret is not a cert and RS256 requires a cert.
      jwt.sign({ foo: 'bar' }, secret, { notBefore: {} }, function (err) {
        expect(err).to.be.ok;
        done();
      });
    });

    it('should return error on wrong arguments (2)', function(done) {
      jwt.sign('string', 'secret', {noTimestamp: true}, function (err) {
        expect(err).to.be.ok;
        expect(err).to.be.instanceof(Error);
        done();
      });
    });

    it('should not stringify the payload', function (done) {
      jwt.sign('string', 'secret', {}, function (err, token) {
        if (err) { return done(err); }
        expect(jws.decode(token).payload).to.equal('string');
        done();
      });
    });

    describe('when mutatePayload is not set', function() {
      it('should not apply claims to the original payload object (mutatePayload defaults to false)', function(done) {
        var originalPayload = { foo: 'bar' };
        jwt.sign(originalPayload, 'secret', { notBefore: 60, expiresIn: 600 }, function (err) {
          if (err) { return done(err); }
          expect(originalPayload).to.not.have.property('nbf');
          expect(originalPayload).to.not.have.property('exp');
          done();
        });
      });
    });

    describe('when mutatePayload is set to true', function() {
      it('should apply claims directly to the original payload object', function(done) {
        var originalPayload = { foo: 'bar' };
        jwt.sign(originalPayload, 'secret', { notBefore: 60, expiresIn: 600, mutatePayload: true }, function (err) {
          if (err) { return done(err); }
          expect(originalPayload).to.have.property('nbf').that.is.a('number');
          expect(originalPayload).to.have.property('exp').that.is.a('number');
          done();
        });
      });
    });

    describe('secret must have a value', function(){
      [undefined, '', 0].forEach(function(secret){
        it('should return an error if the secret is falsy and algorithm is not set to none: ' + (typeof secret === 'string' ? '(empty string)' : secret), function(done) {
        // This is needed since jws will not answer for falsy secrets
          jwt.sign('string', secret, {}, function(err, token) {
            expect(err).to.exist;
            expect(err.message).to.equal('secretOrPrivateKey must have a value');
            expect(token).to.not.exist;
            done();
          });
        });
      });
    });
  });
});
