var should = require('chai').should();
var Pubkey = require('../lib/pubkey');
var Point = require('../lib/point');
var Bn = require('../lib/bn');
var Privkey = require('../lib/privkey');

describe('Pubkey', function() {
  
  it('should create a blank public key', function() {
    var pk = new Pubkey();
    should.exist(pk);
  });

  it('should create a public key with a point', function() {
    var p = Point();
    var pk = new Pubkey({point: p});
    should.exist(pk.point);
  });

  it('should create a public key with a point with this convenient method', function() {
    var p = Point();
    var pk = new Pubkey(p);
    should.exist(pk.point);
    pk.point.toString().should.equal(p.toString());
  });

  describe('#set', function() {
    
    it('should make a public key from a point', function() {
      should.exist(Pubkey().set({point: Point.getG()}).point);
    });

  });

  describe('#fromPrivkey', function() {
    
    it('should make a public key from a privkey', function() {
      should.exist(Pubkey().fromPrivkey(Privkey().fromRandom()));
    });

  });

  describe('#fromBuffer', function() {
    
    it('should parse this uncompressed public key', function() {
      var pk = new Pubkey();
      pk.fromBuffer(new Buffer('041ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341', 'hex'));
      pk.point.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
      pk.point.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
    });

    it('should parse this compressed public key', function() {
      var pk = new Pubkey();
      pk.fromBuffer(new Buffer('031ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
      pk.point.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
      pk.point.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
    });

    it('should throw an error on this invalid public key', function() {
      var pk = new Pubkey();
      (function() {
        pk.fromBuffer(new Buffer('091ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
      }).should.throw();
    });

  });

  describe('#fromDER', function() {
    
    it('should parse this uncompressed public key', function() {
      var pk = new Pubkey();
      pk.fromDER(new Buffer('041ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341', 'hex'));
      pk.point.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
      pk.point.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
    });

    it('should parse this compressed public key', function() {
      var pk = new Pubkey();
      pk.fromDER(new Buffer('031ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
      pk.point.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
      pk.point.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
    });

    it('should throw an error on this invalid public key', function() {
      var pk = new Pubkey();
      (function() {
        pk.fromDER(new Buffer('091ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
      }).should.throw();
    });

  });

  describe('#fromString', function() {

    it('should parse this known valid public key', function() {
      pk = new Pubkey();
      pk.fromString('041ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
      pk.point.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
      pk.point.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
    });

  });

  describe('#fromX', function() {
    
    it('should create this known public key', function() {
      var x = Bn.fromBuffer(new Buffer('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
      var pk = new Pubkey();
      pk.fromX(true, x);
      pk.point.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
      pk.point.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
    });

  });

  describe('#toBuffer', function() {

    it('should return this compressed DER format', function() {
      var x = Bn.fromBuffer(new Buffer('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
      var pk = new Pubkey();
      pk.fromX(true, x);
      pk.toBuffer().toString('hex').should.equal('031ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
    });

  });

  describe('#toDER', function() {

    it('should return this compressed DER format', function() {
      var x = Bn.fromBuffer(new Buffer('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
      var pk = new Pubkey();
      pk.fromX(true, x);
      pk.toDER(true).toString('hex').should.equal('031ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
    });

    it('should return this uncompressed DER format', function() {
      var x = Bn.fromBuffer(new Buffer('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
      var pk = new Pubkey();
      pk.fromX(true, x);
      pk.toDER(false).toString('hex').should.equal('041ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
    });

  });

  describe('#toString', function() {
    
    it('should print this known public key', function() {
      var hex = '031ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a';
      var pk = new Pubkey();
      pk.fromString(hex);
      pk.toString().should.equal(hex);
    });

  });

  describe('#validate', function() {

    it('should not throw an error if pubkey is valid', function() {
      var hex = '031ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a';
      var pk = new Pubkey();
      pk.fromString(hex);
      should.exist(pk.validate());
    });
    
    it('should not throw an error if pubkey is invalid', function() {
      var hex = '041ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a0000000000000000000000000000000000000000000000000000000000000000';
      var pk = new Pubkey();
      pk.fromString(hex);
      (function() {
        pk.validate();
      }).should.throw('Invalid y value of public key');
    });
    
    it('should not throw an error if pubkey is infinity', function() {
      var pk = new Pubkey();
      pk.point = Point.getG().mul(Point.getN());
      (function() {
        pk.validate();
      }).should.throw('Point cannot be equal to Infinity');
    });
    
  });

});