'use strict';

/* jshint unused: false */
/* jshint latedef: false */
var should = require('chai').should();
var expect = require('chai').expect;
var _ = require('lodash');

var bitcore = require('../..');
var Transaction = bitcore.Transaction;
var PrivateKey = bitcore.PrivateKey;
var Script = bitcore.Script;
var Address = bitcore.Address;
var Networks = bitcore.Networks;
var errors = bitcore.errors;

var transactionVector = require('../data/tx_creation');

describe('Transaction', function() {

  it('should serialize and deserialize correctly a given transaction', function() {
    var transaction = new Transaction(tx_1_hex);
    transaction.serialize().should.equal(tx_1_hex);
  });

  it('fails if an invalid parameter is passed to constructor', function() {
    expect(function() {
      return new Transaction(1);
    }).to.throw(errors.InvalidArgument);
  });

  var testScript = 'OP_DUP OP_HASH160 20 0x88d9931ea73d60eaf7e5671efc0552b912911f2a OP_EQUALVERIFY OP_CHECKSIG';
  var testPrevTx = 'a477af6b2667c29670467e4e0728b685ee07b240235771862318e29ddbe58458';
  var testAmount = 1020000;
  var testTransaction = new Transaction()
    .from({
      'txId': testPrevTx,
      'outputIndex': 0,
      'script': testScript,
      'satoshis': testAmount
    }).to('mrU9pEmAx26HcbKVrABvgL7AwA5fjNFoDc', testAmount - 10000);

  it('can serialize to a plain javascript object', function() {
    var object = testTransaction.toObject();
    object.inputs[0].output.satoshis.should.equal(testAmount);
    object.inputs[0].output.script.toString().should.equal(testScript);
    object.inputs[0].prevTxId.should.equal(testPrevTx);
    object.inputs[0].outputIndex.should.equal(0);
    object.outputs[0].satoshis.should.equal(testAmount - 10000);
  });

  it('returns the fee correctly', function() {
    testTransaction.getFee().should.equal(10000);
  });

  it('serialize to Object roundtrip', function() {
    new Transaction(testTransaction.toObject()).serialize().should.equal(testTransaction.serialize());
  });

  it('constructor returns a shallow copy of another transaction', function() {
    var transaction = new Transaction(tx_1_hex);
    var copy = new Transaction(transaction);
    copy.serialize().should.equal(transaction.serialize());
  });

  it('should display correctly in console', function() {
    var transaction = new Transaction(tx_1_hex);
    transaction.inspect().should.equal('<Transaction: ' + tx_1_hex + '>');
  });

  it('standard hash of transaction should be decoded correctly', function() {
    var transaction = new Transaction(tx_1_hex);
    transaction.id.should.equal(tx_1_id);
  });

  it('serializes an empty transaction', function() {
    var transaction = new Transaction();
    transaction.serialize().should.equal(tx_empty_hex);
  });

  it('serializes and deserializes correctly', function() {
    var transaction = new Transaction(tx_1_hex);
    transaction.serialize().should.equal(tx_1_hex);
  });

  describe('transaction creation test vector', function() {
    var index = 0;
    transactionVector.forEach(function(vector) {
      index++;
      it('case ' + index, function() {
        var i = 0;
        var transaction = new Transaction();
        while (i < vector.length) {
          var command = vector[i];
          var args = vector[i + 1];
          if (command === 'serialize') {
            transaction.serialize().should.equal(args);
          } else {
            transaction[command].apply(transaction, args);
          }
          i += 2;
        }
      });
    });
  });

  // TODO: Migrate this into a test for inputs

  var fromAddress = 'mszYqVnqKoQx4jcTdJXxwKAissE3Jbrrc1';
  var simpleUtxoWith100000Satoshis = {
    address: fromAddress,
    txId: 'a477af6b2667c29670467e4e0728b685ee07b240235771862318e29ddbe58458',
    outputIndex: 0,
    script: Script.buildPublicKeyHashOut(fromAddress).toString(),
    satoshis: 100000
  };
  var toAddress = 'mrU9pEmAx26HcbKVrABvgL7AwA5fjNFoDc';
  var changeAddress = 'mgBCJAsvzgT2qNNeXsoECg2uPKrUsZ76up';
  var changeAddressP2SH = '2N7T3TAetJrSCruQ39aNrJvYLhG1LJosujf';
  var privateKey = 'cSBnVM4xvxarwGQuAfQFwqDg9k5tErHUHzgWsEfD4zdwUasvqRVY';

  describe('change address', function() {
    it('can calculate simply the output amount', function() {
      var transaction = new Transaction()
        .from(simpleUtxoWith100000Satoshis)
        .to(toAddress, 50000)
        .change(changeAddress)
        .sign(privateKey);
      transaction.outputs.length.should.equal(2);
      transaction.outputs[1].satoshis.should.equal(40000);
      transaction.outputs[1].script.toString()
        .should.equal(Script.fromAddress(changeAddress).toString());
    });
    it('accepts a P2SH address for change', function() {
      var transaction = new Transaction()
        .from(simpleUtxoWith100000Satoshis)
        .to(toAddress, 50000)
        .change(changeAddressP2SH)
        .sign(privateKey);
      transaction.outputs.length.should.equal(2);
      transaction.outputs[1].script.isScriptHashOut().should.equal(true);
    });
    it('can recalculate the change amount', function() {
      var transaction = new Transaction()
        .from(simpleUtxoWith100000Satoshis)
        .to(toAddress, 50000)
        .change(changeAddress)
        .sign(privateKey)
        .to(toAddress, 20000)
        .sign(privateKey);
      transaction.outputs.length.should.equal(3);
      transaction.outputs[2].satoshis.should.equal(20000);
      transaction.outputs[2].script.toString()
        .should.equal(Script.fromAddress(changeAddress).toString());
    });
    it('adds no fee if no change is available', function() {
      var transaction = new Transaction()
        .from(simpleUtxoWith100000Satoshis)
        .to(toAddress, 99000)
        .sign(privateKey);
      transaction.outputs.length.should.equal(1);
    });
    it('adds no fee if no money is available', function() {
      var transaction = new Transaction()
        .from(simpleUtxoWith100000Satoshis)
        .to(toAddress, 100000)
        .change(changeAddress)
        .sign(privateKey);
      transaction.outputs.length.should.equal(1);
    });
    it('fee can be set up manually', function() {
      var transaction = new Transaction()
        .from(simpleUtxoWith100000Satoshis)
        .to(toAddress, 80000)
        .fee(10000)
        .change(changeAddress)
        .sign(privateKey);
      transaction.outputs.length.should.equal(2);
      transaction.outputs[1].satoshis.should.equal(10000);
    });
    it('coverage: on second call to sign, change is not recalculated', function() {
      var transaction = new Transaction()
        .from(simpleUtxoWith100000Satoshis)
        .to(toAddress, 100000)
        .change(changeAddress)
        .sign(privateKey)
        .sign(privateKey);
      transaction.outputs.length.should.equal(1);
    });
  });

  var simpleUtxoWith1BTC = {
    address: fromAddress,
    txId: 'a477af6b2667c29670467e4e0728b685ee07b240235771862318e29ddbe58458',
    outputIndex: 0,
    script: Script.buildPublicKeyHashOut(fromAddress).toString(),
    satoshis: 1e8
  };

  describe('checked serialize', function() {
    it('fails if no change address was set', function() {
      var transaction = new Transaction()
        .from(simpleUtxoWith1BTC)
        .to(toAddress, 1);
      expect(function() {
        return transaction.serialize();
      }).to.throw(errors.Transaction.ChangeAddressMissing);
    });
    it('fails if a high fee was set', function() {
      var transaction = new Transaction()
        .from(simpleUtxoWith1BTC)
        .change(changeAddress)
        .to(toAddress, 1);
      expect(function() {
        return transaction.serialize();
      }).to.throw(errors.Transaction.FeeError);
    });
  });
});

var tx_empty_hex = '01000000000000000000';

/* jshint maxlen: 1000 */
var tx_1_hex = '01000000015884e5db9de218238671572340b207ee85b628074e7e467096c267266baf77a4000000006a473044022013fa3089327b50263029265572ae1b022a91d10ac80eb4f32f291c914533670b02200d8a5ed5f62634a7e1a0dc9188a3cc460a986267ae4d58faf50c79105431327501210223078d2942df62c45621d209fab84ea9a7a23346201b7727b9b45a29c4e76f5effffffff0150690f00000000001976a9147821c0a3768aa9d1a37e16cf76002aef5373f1a888ac00000000';
var tx_1_id = '779a3e5b3c2c452c85333d8521f804c1a52800e60f4b7c3bbe36f4bab350b72c';