'use strict';

var should = require('chai').should();
var expect = require('chai').expect;
var bitcore = require('../..');

var BufferUtil = bitcore.util.buffer;
var Script = bitcore.Script;
var Networks = bitcore.Networks;
var Opcode = bitcore.Opcode;
var PublicKey = bitcore.PublicKey;
var Address = bitcore.Address;

describe('Script', function() {

  it('should make a new script', function() {
    var script = new Script();
    should.exist(script);
  });

  describe('#fromBuffer', function() {

    it('should parse this buffer containing an OP code', function() {
      var buf = new Buffer(1);
      buf[0] = Opcode.OP_0;
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].opcodenum.should.equal(buf[0]);
    });

    it('should parse this buffer containing another OP code', function() {
      var buf = new Buffer(1);
      buf[0] = Opcode.OP_CHECKMULTISIG;
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].opcodenum.should.equal(buf[0]);
    });

    it('should parse this buffer containing three bytes of data', function() {
      var buf = new Buffer([3, 1, 2, 3]);
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].buf.toString('hex').should.equal('010203');
    });

    it('should parse this buffer containing OP_PUSHDATA1 and three bytes of data', function() {
      var buf = new Buffer([0, 0, 1, 2, 3]);
      buf[0] = Opcode.OP_PUSHDATA1;
      buf.writeUInt8(3, 1);
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].buf.toString('hex').should.equal('010203');
    });

    it('should parse this buffer containing OP_PUSHDATA2 and three bytes of data', function() {
      var buf = new Buffer([0, 0, 0, 1, 2, 3]);
      buf[0] = Opcode.OP_PUSHDATA2;
      buf.writeUInt16LE(3, 1);
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].buf.toString('hex').should.equal('010203');
    });

    it('should parse this buffer containing OP_PUSHDATA4 and three bytes of data', function() {
      var buf = new Buffer([0, 0, 0, 0, 0, 1, 2, 3]);
      buf[0] = Opcode.OP_PUSHDATA4;
      buf.writeUInt16LE(3, 1);
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].buf.toString('hex').should.equal('010203');
    });

    it('should parse this buffer an OP code, data, and another OP code', function() {
      var buf = new Buffer([0, 0, 0, 0, 0, 0, 1, 2, 3, 0]);
      buf[0] = Opcode.OP_0;
      buf[1] = Opcode.OP_PUSHDATA4;
      buf.writeUInt16LE(3, 2);
      buf[buf.length - 1] = Opcode.OP_0;
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(3);
      script.chunks[0].opcodenum.should.equal(buf[0]);
      script.chunks[1].buf.toString('hex').should.equal('010203');
      script.chunks[2].opcodenum.should.equal(buf[buf.length - 1]);
    });

  });

  describe('#toBuffer', function() {

    it('should output this buffer containing an OP code', function() {
      var buf = new Buffer(1);
      buf[0] = Opcode.OP_0;
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].opcodenum.should.equal(buf[0]);
      script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
    });

    it('should output this buffer containing another OP code', function() {
      var buf = new Buffer(1);
      buf[0] = Opcode.OP_CHECKMULTISIG;
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].opcodenum.should.equal(buf[0]);
      script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
    });

    it('should output this buffer containing three bytes of data', function() {
      var buf = new Buffer([3, 1, 2, 3]);
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].buf.toString('hex').should.equal('010203');
      script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
    });

    it('should output this buffer containing OP_PUSHDATA1 and three bytes of data', function() {
      var buf = new Buffer([0, 0, 1, 2, 3]);
      buf[0] = Opcode.OP_PUSHDATA1;
      buf.writeUInt8(3, 1);
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].buf.toString('hex').should.equal('010203');
      script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
    });

    it('should output this buffer containing OP_PUSHDATA2 and three bytes of data', function() {
      var buf = new Buffer([0, 0, 0, 1, 2, 3]);
      buf[0] = Opcode.OP_PUSHDATA2;
      buf.writeUInt16LE(3, 1);
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].buf.toString('hex').should.equal('010203');
      script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
    });

    it('should output this buffer containing OP_PUSHDATA4 and three bytes of data', function() {
      var buf = new Buffer([0, 0, 0, 0, 0, 1, 2, 3]);
      buf[0] = Opcode.OP_PUSHDATA4;
      buf.writeUInt16LE(3, 1);
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(1);
      script.chunks[0].buf.toString('hex').should.equal('010203');
      script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
    });

    it('should output this buffer an OP code, data, and another OP code', function() {
      var buf = new Buffer([0, 0, 0, 0, 0, 0, 1, 2, 3, 0]);
      buf[0] = Opcode.OP_0;
      buf[1] = Opcode.OP_PUSHDATA4;
      buf.writeUInt16LE(3, 2);
      buf[buf.length - 1] = Opcode.OP_0;
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(3);
      script.chunks[0].opcodenum.should.equal(buf[0]);
      script.chunks[1].buf.toString('hex').should.equal('010203');
      script.chunks[2].opcodenum.should.equal(buf[buf.length - 1]);
      script.toBuffer().toString('hex').should.equal(buf.toString('hex'));
    });

  });

  describe('#fromString', function() {

    it('should parse these known scripts', function() {
      Script.fromString('OP_0 OP_PUSHDATA4 3 0x010203 OP_0').toString().should.equal('OP_0 OP_PUSHDATA4 3 0x010203 OP_0');
      Script.fromString('OP_0 OP_PUSHDATA2 3 0x010203 OP_0').toString().should.equal('OP_0 OP_PUSHDATA2 3 0x010203 OP_0');
      Script.fromString('OP_0 OP_PUSHDATA1 3 0x010203 OP_0').toString().should.equal('OP_0 OP_PUSHDATA1 3 0x010203 OP_0');
      Script.fromString('OP_0 3 0x010203 OP_0').toString().should.equal('OP_0 3 0x010203 OP_0');
    });

  });

  describe('#toString', function() {

    it('should work with an empty script', function() {
      var script = new Script();
      script.toString().should.equal('');
    });

    it('should output this buffer an OP code, data, and another OP code', function() {
      var buf = new Buffer([0, 0, 0, 0, 0, 0, 1, 2, 3, 0]);
      buf[0] = Opcode.OP_0;
      buf[1] = Opcode.OP_PUSHDATA4;
      buf.writeUInt16LE(3, 2);
      buf[buf.length - 1] = Opcode.OP_0;
      var script = Script.fromBuffer(buf);
      script.chunks.length.should.equal(3);
      script.chunks[0].opcodenum.should.equal(buf[0]);
      script.chunks[1].buf.toString('hex').should.equal('010203');
      script.chunks[2].opcodenum.should.equal(buf[buf.length - 1]);
      script.toString().toString('hex').should.equal('OP_0 OP_PUSHDATA4 3 0x010203 OP_0');
    });

  });

  describe('toHex', function() {
    it('should return an hexa string "03010203" as expected from [3, 1, 2, 3]', function() {
      var buf = new Buffer([3, 1, 2, 3]);
      var script = Script.fromBuffer(buf);
      script.toHex().should.equal('03010203');
    });
  });

  describe('#isDataOut', function() {

    it('should know this is a (blank) OP_RETURN script', function() {
      Script('OP_RETURN').isDataOut().should.equal(true);
    });

    it('validates that this 40-byte OP_RETURN is standard', function() {
      var buf = new Buffer(40);
      buf.fill(0);
      Script('OP_RETURN 40 0x' + buf.toString('hex')).isDataOut().should.equal(true);
    });
    it('validates that this 80-byte OP_RETURN is standard', function() {
      var buf = new Buffer(80);
      buf.fill(0);
      Script('OP_RETURN OP_PUSHDATA1 80 0x' + buf.toString('hex')).isDataOut().should.equal(true);
    });

    it('validates that this 40-byte long OP_CHECKMULTISIG is not standard op_return', function() {
      var buf = new Buffer(40);
      buf.fill(0);
      Script('OP_CHECKMULTISIG 40 0x' + buf.toString('hex')).isDataOut().should.equal(false);
    });

    it('validates that this 81-byte OP_RETURN is not a valid standard OP_RETURN', function() {
      var buf = new Buffer(81);
      buf.fill(0);
      Script('OP_RETURN OP_PUSHDATA1 81 0x' + buf.toString('hex')).isDataOut().should.equal(false);
    });
  });

  describe('#isPublicKeyHashIn', function() {

    it('should identify this known pubkeyhashin', function() {
      Script('73 0x3046022100bb3c194a30e460d81d34be0a230179c043a656f67e3c5c8bf47eceae7c4042ee0221008bf54ca11b2985285be0fd7a212873d243e6e73f5fad57e8eb14c4f39728b8c601 65 0x04e365859b3c78a8b7c202412b949ebca58e147dba297be29eee53cd3e1d300a6419bc780cc9aec0dc94ed194e91c8f6433f1b781ee00eac0ead2aae1e8e0712c6').isPublicKeyHashIn().should.equal(true);
    });

    it('should identify this known pubkeyhashin starting with 0x02', function() {
      Script('73 0x3046022100bb3c194a30e460d81d34be0a230179c043a656f67e3c5c8bf47eceae7c4042ee0221008bf54ca11b2985285be0fd7a212873d243e6e73f5fad57e8eb14c4f39728b8c601 21 0x02aec6b86621e7fef63747fbfd6a6e7d54c8e1052044ef2dd2c5e46656ef1194d4').isPublicKeyHashIn().should.equal(true);
    });

    it('should identify this known pubkeyhashin starting with 0x03', function() {
      Script('73 0x3046022100bb3c194a30e460d81d34be0a230179c043a656f67e3c5c8bf47eceae7c4042ee0221008bf54ca11b2985285be0fd7a212873d243e6e73f5fad57e8eb14c4f39728b8c601 21 0x03e724d93c4fda5f1236c525de7ffac6c5f1f72b0f5cdd1fc4b4f5642b6d055fcc').isPublicKeyHashIn().should.equal(true);
    });

    it('should identify this known non-pubkeyhashin', function() {
      Script('73 0x3046022100bb3c194a30e460d81d34be0a230179c043a656f67e3c5c8bf47eceae7c4042ee0221008bf54ca11b2985285be0fd7a212873d243e6e73f5fad57e8eb14c4f39728b8c601 65 0x04e365859b3c78a8b7c202412b949ebca58e147dba297be29eee53cd3e1d300a6419bc780cc9aec0dc94ed194e91c8f6433f1b781ee00eac0ead2aae1e8e0712c6 OP_CHECKSIG').isPublicKeyHashIn().should.equal(false);
    });

  });

  describe('#isPublicKeyHashOut', function() {

    it('should identify this known pubkeyhashout as pubkeyhashout', function() {
      Script('OP_DUP OP_HASH160 20 0000000000000000000000000000000000000000 OP_EQUALVERIFY OP_CHECKSIG').isPublicKeyHashOut().should.equal(true);
    });

    it('should identify this known non-pubkeyhashout as not pubkeyhashout', function() {
      Script('OP_DUP OP_HASH160 20 0000000000000000000000000000000000000000').isPublicKeyHashOut().should.equal(false);
    });

  });

  describe('#isMultisigOut', function() {
    it('should identify known multisig out 1', function() {
      Script('OP_2 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 OP_2 OP_CHECKMULTISIG').isMultisigOut().should.equal(true);
    });
    it('should identify known multisig out 2', function() {
      Script('OP_1 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 OP_2 OP_CHECKMULTISIG').isMultisigOut().should.equal(true);
    });
    it('should identify known multisig out 3', function() {
      Script('OP_2 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 21 0x03363d90d447b00c9c99ceac05b6262ee053441c7e55552ffe526bad8f83ff4640 OP_3 OP_CHECKMULTISIG').isMultisigOut().should.equal(true);
    });

    it('should identify non-multisig out 1', function() {
      Script('OP_2 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 OP_2 OP_CHECKMULTISIG OP_EQUAL').isMultisigOut().should.equal(false);
    });
    it('should identify non-multisig out 2', function() {
      Script('OP_2').isMultisigOut().should.equal(false);
    });
  });

  describe('#isMultisigIn', function() {
    it('should identify multisig in 1', function() {
      Script('OP_0 0x47 0x3044022002a27769ee33db258bdf7a3792e7da4143ec4001b551f73e6a190b8d1bde449d02206742c56ccd94a7a2e16ca52fc1ae4a0aa122b0014a867a80de104f9cb18e472c01').isMultisigIn().should.equal(true);
    });
    it('should identify multisig in 2', function() {
      Script('OP_0 0x47 0x3044022002a27769ee33db258bdf7a3792e7da4143ec4001b551f73e6a190b8d1bde449d02206742c56ccd94a7a2e16ca52fc1ae4a0aa122b0014a867a80de104f9cb18e472c01 0x47 30450220357011fd3b3ad2b8f2f2d01e05dc6108b51d2a245b4ef40c112d6004596f0475022100a8208c93a39e0c366b983f9a80bfaf89237fcd64ca543568badd2d18ee2e1d7501').isMultisigIn().should.equal(true);
    });
    it('should identify non-multisig in 1', function() {
      Script('0x47 0x3044022002a27769ee33db258bdf7a3792e7da4143ec4001b551f73e6a190b8d1bde449d02206742c56ccd94a7a2e16ca52fc1ae4a0aa122b0014a867a80de104f9cb18e472c01').isMultisigIn().should.equal(false);
    });
    it('should identify non-multisig in 2', function() {
      Script('OP_0 0x47 0x3044022002a27769ee33db258bdf7a3792e7da4143ec4001b551f73e6a190b8d1bde449d02206742c56ccd94a7a2e16ca52fc1ae4a0aa122b0014a867a80de104f9cb18e472c01 OP_0').isMultisigIn().should.equal(false);
    });
  });

  describe('#isScriptHashIn', function() {
    it('should identify this known scripthashin', function() {
      var sstr = 'OP_0 73 0x30460221008ca148504190c10eea7f5f9c283c719a37be58c3ad617928011a1bb9570901d2022100ced371a23e86af6f55ff4ce705c57d2721a09c4d192ca39d82c4239825f75a9801 72 0x30450220357011fd3b3ad2b8f2f2d01e05dc6108b51d2a245b4ef40c112d6004596f0475022100a8208c93a39e0c366b983f9a80bfaf89237fcd64ca543568badd2d18ee2e1d7501 OP_PUSHDATA1 105 0x5221024c02dff2f0b8263a562a69ec875b2c95ffad860f428acf2f9e8c6492bd067d362103546324a1351a6b601c623b463e33b6103ca444707d5b278ece1692f1aa7724a42103b1ad3b328429450069cc3f9fa80d537ee66ba1120e93f3f185a5bf686fb51e0a53ae';
      var s = Script(sstr);
      s.toString().should.equal(sstr);
      s.isScriptHashIn().should.equal(true);
    });

    it('should identify this known non-scripthashin', function() {
      Script('20 0000000000000000000000000000000000000000 OP_CHECKSIG').isScriptHashIn().should.equal(false);
    });
  });

  describe('#isScripthashOut', function() {

    it('should identify this known pubkeyhashout as pubkeyhashout', function() {
      Script('OP_HASH160 20 0x0000000000000000000000000000000000000000 OP_EQUAL').isScriptHashOut().should.equal(true);
    });

    it('should identify these known non-pubkeyhashout as not pubkeyhashout', function() {
      Script('OP_HASH160 20 0x0000000000000000000000000000000000000000 OP_EQUAL OP_EQUAL').isScriptHashOut().should.equal(false);
      Script('OP_HASH160 21 0x000000000000000000000000000000000000000000 OP_EQUAL').isScriptHashOut().should.equal(false);
    });

  });

  describe('#isPushOnly', function() {
    it('should know these scripts are or aren\'t push only', function() {
      Script('OP_NOP 1 0x01').isPushOnly().should.equal(false);
      Script('OP_0').isPushOnly().should.equal(true);
      Script('OP_0 OP_RETURN').isPushOnly().should.equal(false);
      Script('OP_PUSHDATA1 5 0x1010101010').isPushOnly().should.equal(true);
      // like bitcoind, we regard OP_RESERVED as being "push only"
      Script('OP_RESERVED').isPushOnly().should.equal(true);
    });
  });

  describe('#classify', function() {
    it('should classify public key hash out', function() {
      Script('OP_DUP OP_HASH160 20 0000000000000000000000000000000000000000 OP_EQUALVERIFY OP_CHECKSIG').classify().should.equal(Script.types.PUBKEYHASH_OUT);
    });
    it('should classify public key hash in', function() {
      Script('47 0x3044022077a8d81e656c4a1c1721e68ce35fa0b27f13c342998e75854858c12396a15ffa02206378a8c6959283c008c87a14a9c0ada5cf3934ac5ee29f1fef9cac6969783e9801 21 0x03993c230da7dabb956292851ae755f971c50532efc095a16bee07f83ab9d262df').classify().should.equal(Script.types.PUBKEYHASH_IN);
    });
    it('should classify script hash out', function() {
      Script('OP_HASH160 20 0x0000000000000000000000000000000000000000 OP_EQUAL').classify().should.equal(Script.types.SCRIPTHASH_OUT);
    });
    it('should classify script hash in', function() {
      Script('OP_0 73 0x30460221008ca148504190c10eea7f5f9c283c719a37be58c3ad617928011a1bb9570901d2022100ced371a23e86af6f55ff4ce705c57d2721a09c4d192ca39d82c4239825f75a9801 72 0x30450220357011fd3b3ad2b8f2f2d01e05dc6108b51d2a245b4ef40c112d6004596f0475022100a8208c93a39e0c366b983f9a80bfaf89237fcd64ca543568badd2d18ee2e1d7501 OP_PUSHDATA1 105 0x5221024c02dff2f0b8263a562a69ec875b2c95ffad860f428acf2f9e8c6492bd067d362103546324a1351a6b601c623b463e33b6103ca444707d5b278ece1692f1aa7724a42103b1ad3b328429450069cc3f9fa80d537ee66ba1120e93f3f185a5bf686fb51e0a53ae').classify().should.equal(Script.types.SCRIPTHASH_IN);
    });
    it('should classify MULTISIG out', function() {
      Script('OP_2 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 OP_2 OP_CHECKMULTISIG').classify().should.equal(Script.types.MULTISIG_OUT);
    });
    it('should classify MULTISIG in', function() {
      Script('OP_0 0x47 0x3044022002a27769ee33db258bdf7a3792e7da4143ec4001b551f73e6a190b8d1bde449d02206742c56ccd94a7a2e16ca52fc1ae4a0aa122b0014a867a80de104f9cb18e472c01').classify().should.equal(Script.types.MULTISIG_IN);
    });
    it('should classify OP_RETURN data out', function() {
      Script('OP_RETURN 1 0x01').classify().should.equal(Script.types.DATA_OUT);
    });
    it('should classify public key out', function() {
      Script('41 0x0479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8 OP_CHECKSIG').classify().should.equal(Script.types.PUBKEY_OUT);
    });
    it('should classify public key in', function() {
      Script('47 0x3044022007415aa37ce7eaa6146001ac8bdefca0ddcba0e37c5dc08c4ac99392124ebac802207d382307fd53f65778b07b9c63b6e196edeadf0be719130c5db21ff1e700d67501').classify().should.equal(Script.types.PUBKEY_IN);
    });
    it('should classify unknown', function() {
      Script('OP_TRUE OP_FALSE').classify().should.equal(Script.types.UNKNOWN);
    });
  });

  describe('#add and #prepend', function() {

    it('should add these ops', function() {
      Script().add(1).add(10).add(186).toString().should.equal('0x01 0x0a 0xba');
      Script().add(1000).toString().should.equal('0x03e8');
      Script().add('OP_CHECKMULTISIG').toString().should.equal('OP_CHECKMULTISIG');
      Script().add('OP_1').add('OP_2').toString().should.equal('OP_1 OP_2');
      Script().add(Opcode.OP_CHECKMULTISIG).toString().should.equal('OP_CHECKMULTISIG');
      Script().add(Opcode.map.OP_CHECKMULTISIG).toString().should.equal('OP_CHECKMULTISIG');
    });

    it('should prepend these ops', function() {
      Script().prepend('OP_CHECKMULTISIG').toString().should.equal('OP_CHECKMULTISIG');
      Script().prepend('OP_1').prepend('OP_2').toString().should.equal('OP_2 OP_1');
    });

    it('should add and prepend correctly', function() {
      Script().add('OP_1').prepend('OP_2').add('OP_3').prepend('OP_4').toString()
        .should.equal('OP_4 OP_2 OP_1 OP_3');
    });

    it('should add these push data', function() {
      var buf = new Buffer(1);
      buf.fill(0);
      Script().add(buf).toString().should.equal('1 0x00');
      buf = new Buffer(255);
      buf.fill(0);
      Script().add(buf).toString().should.equal('OP_PUSHDATA1 255 0x' + buf.toString('hex'));
      buf = new Buffer(256);
      buf.fill(0);
      Script().add(buf).toString().should.equal('OP_PUSHDATA2 256 0x' + buf.toString('hex'));
      buf = new Buffer(Math.pow(2, 16));
      buf.fill(0);
      Script().add(buf).toString().should.equal('OP_PUSHDATA4 ' + Math.pow(2, 16) + ' 0x' + buf.toString('hex'));
    });

    it('should add both pushdata and non-pushdata chunks', function() {
      Script().add('OP_CHECKMULTISIG').toString().should.equal('OP_CHECKMULTISIG');
      Script().add(Opcode.map.OP_CHECKMULTISIG).toString().should.equal('OP_CHECKMULTISIG');
      var buf = new Buffer(1);
      buf.fill(0);
      Script().add(buf).toString().should.equal('1 0x00');
    });

    it('should work for no data OP_RETURN', function() {
      Script().add(Opcode.OP_RETURN).add(new Buffer('')).toString().should.equal('OP_RETURN 0');
    });
  });

  describe('#isStandard', function() {
    it('should classify correctly standard script', function() {
      Script('OP_RETURN 1 0x00').isStandard().should.equal(true);
    });
    it('should classify correctly non standard script', function() {
      Script('OP_TRUE OP_FALSE').isStandard().should.equal(false);
    });
  });

  describe('#buildMultisigOut', function() {
    var pubkey_hexs = [
      '022df8750480ad5b26950b25c7ba79d3e37d75f640f8e5d9bcd5b150a0f85014da',
      '03e3818b65bcc73a7d64064106a859cc1a5a728c4345ff0b641209fba0d90de6e9',
      '021f2f6e1e50cb6a953935c3601284925decd3fd21bc445712576873fb8c6ebc18',
      '02bf97f572a02a8900246d72c2e8fa3d3798a6e59c4e17de2d131d9c60d0d9b574',
      '036a98a36aa7665874b1ba9130bc6d318e52fd3bdb5969532d7fc09bf2476ff842',
      '033aafcbead78c08b0e0aacc1b0cdb40702a7c709b660bebd286e973242127e15b',
    ];
    var sortkeys = pubkey_hexs.slice(0, 3).map(PublicKey);
    it('should create sorted script by default', function() {
      var s = Script.buildMultisigOut(sortkeys, 2);
      s.toString().should.equal('OP_2 33 0x021f2f6e1e50cb6a953935c3601284925decd3fd21bc445712576873fb8c6ebc18 33 0x022df8750480ad5b26950b25c7ba79d3e37d75f640f8e5d9bcd5b150a0f85014da 33 0x03e3818b65bcc73a7d64064106a859cc1a5a728c4345ff0b641209fba0d90de6e9 OP_3 OP_CHECKMULTISIG');
      s.isMultisigOut().should.equal(true);
    });
    it('should fail when number of required signatures is greater than number of pubkeys', function() {
      expect(sortkeys.length).to.equal(3);
      expect(function() {
        return Script.buildMultisigOut(sortkeys, 4);
      }).to.throw('Number of required signatures must be less than or equal to the number of public keys');
    });
    it('should create unsorted script if specified', function() {
      var s = Script.buildMultisigOut(sortkeys, 2);
      var u = Script.buildMultisigOut(sortkeys, 2, {
        noSorting: true
      });
      s.toString().should.not.equal(u.toString());
      u.toString().should.equal('OP_2 33 0x022df8750480ad5b26950b25c7ba79d3e37d75f640f8e5d9bcd5b150a0f85014da 33 0x03e3818b65bcc73a7d64064106a859cc1a5a728c4345ff0b641209fba0d90de6e9 33 0x021f2f6e1e50cb6a953935c3601284925decd3fd21bc445712576873fb8c6ebc18 OP_3 OP_CHECKMULTISIG');
      s.isMultisigOut().should.equal(true);
    });
    var test_mn = function(m, n) {
      var pubkeys = pubkey_hexs.slice(0, n).map(PublicKey);
      var s = Script.buildMultisigOut(pubkeys, m);
      s.isMultisigOut().should.equal(true);
    };
    for (var n = 1; n < 6; n++) {
      for (var m = 1; m <= n; m++) {
        it('should create ' + m + '-of-' + n, test_mn.bind(null, m, n));
      }
    }
  });
  describe('#buildPublicKeyHashOut', function() {
    it('should create script from livenet address', function() {
      var address = Address.fromString('1NaTVwXDDUJaXDQajoa9MqHhz4uTxtgK14');
      var s = Script.buildPublicKeyHashOut(address);
      should.exist(s);
      s.toString().should.equal('OP_DUP OP_HASH160 20 0xecae7d092947b7ee4998e254aa48900d26d2ce1d OP_EQUALVERIFY OP_CHECKSIG');
      s.isPublicKeyHashOut().should.equal(true);
      s.toAddress().toString().should.equal('1NaTVwXDDUJaXDQajoa9MqHhz4uTxtgK14');
    });
    it('should create script from testnet address', function() {
      var address = Address.fromString('mxRN6AQJaDi5R6KmvMaEmZGe3n5ScV9u33');
      var s = Script.buildPublicKeyHashOut(address);
      should.exist(s);
      s.toString().should.equal('OP_DUP OP_HASH160 20 0xb96b816f378babb1fe585b7be7a2cd16eb99b3e4 OP_EQUALVERIFY OP_CHECKSIG');
      s.isPublicKeyHashOut().should.equal(true);
      s.toAddress().toString().should.equal('mxRN6AQJaDi5R6KmvMaEmZGe3n5ScV9u33');
    });
    it('should create script from public key', function() {
      var pubkey = new PublicKey('022df8750480ad5b26950b25c7ba79d3e37d75f640f8e5d9bcd5b150a0f85014da');
      var s = Script.buildPublicKeyHashOut(pubkey);
      should.exist(s);
      s.toString().should.equal('OP_DUP OP_HASH160 20 0x9674af7395592ec5d91573aa8d6557de55f60147 OP_EQUALVERIFY OP_CHECKSIG');
      s.isPublicKeyHashOut().should.equal(true);
      should.exist(s._network);
      s._network.should.equal(pubkey.network);
    });
  });
  describe('#buildPublicKeyOut', function() {
    it('should create script from public key', function() {
      var pubkey = new PublicKey('022df8750480ad5b26950b25c7ba79d3e37d75f640f8e5d9bcd5b150a0f85014da');
      var s = Script.buildPublicKeyOut(pubkey);
      should.exist(s);
      s.toString().should.equal('33 0x022df8750480ad5b26950b25c7ba79d3e37d75f640f8e5d9bcd5b150a0f85014da OP_CHECKSIG');
      s.isPublicKeyOut().should.equal(true);
    });
  });
  describe('#buildDataOut', function() {
    it('should create script from no data', function() {
      var s = Script.buildDataOut();
      should.exist(s);
      s.toString().should.equal('OP_RETURN');
      s.isDataOut().should.equal(true);
    });
    it('should create script from empty data', function() {
      var data = new Buffer('');
      var s = Script.buildDataOut(data);
      should.exist(s);
      s.toString().should.equal('OP_RETURN 0');
      s.isDataOut().should.equal(true);
    });
    it('should create script from some data', function() {
      var data = new Buffer('bacacafe0102030405', 'hex');
      var s = Script.buildDataOut(data);
      should.exist(s);
      s.toString().should.equal('OP_RETURN 9 0xbacacafe0102030405');
      s.isDataOut().should.equal(true);
    });
    it('should create script from string', function() {
      var data = 'hello world!!!';
      var s = Script.buildDataOut(data);
      should.exist(s);
      s.toString().should.equal('OP_RETURN 14 0x68656c6c6f20776f726c64212121');
      s.isDataOut().should.equal(true);
    });
  });
  describe('#buildScriptHashOut', function() {
    it('should create script from another script', function() {
      var inner = new Script('OP_DUP OP_HASH160 20 0x06c06f6d931d7bfba2b5bd5ad0d19a8f257af3e3 OP_EQUALVERIFY OP_CHECKSIG');
      var s = Script.buildScriptHashOut(inner);
      should.exist(s);
      s.toString().should.equal('OP_HASH160 20 0x45ea3f9133e7b1cef30ba606f8433f993e41e159 OP_EQUAL');
      s.isScriptHashOut().should.equal(true);
    });

    it('inherits network property from other script', function() {
      var s1 = new Script.fromAddress(new Address('1FSMWkjVPAxzUNjbxT52p3mVKC971rfW3S'));
      var s2 = Script.buildScriptHashOut(s1);
      should.exist(s1._network);
      s1._network.should.equal(s2._network);
    });

    it('inherits network property form an address', function() {
      var address = new Address('34Nn91aTGaULqWsZiunrBPHzFBDrZ3B8XS');
      var script = Script.buildScriptHashOut(address);
      should.exist(script._network);
      script._network.should.equal(address.network);
    });
  });
  describe('#toScriptHashOut', function() {
    it('should create script from another script', function() {
      var s = new Script('OP_DUP OP_HASH160 20 0x06c06f6d931d7bfba2b5bd5ad0d19a8f257af3e3 OP_EQUALVERIFY OP_CHECKSIG');
      var sho = s.toScriptHashOut();
      sho.toString().should.equal('OP_HASH160 20 0x45ea3f9133e7b1cef30ba606f8433f993e41e159 OP_EQUAL');
      sho.isScriptHashOut().should.equal(true);
    });
  });

  describe('#removeCodeseparators', function() {
    it('should remove any OP_CODESEPARATORs', function() {
      Script('OP_CODESEPARATOR OP_0 OP_CODESEPARATOR').removeCodeseparators().toString().should.equal('OP_0');
    });
  });


  describe('#findAndDelete', function() {
    it('should find and delete this buffer', function() {
      Script('OP_RETURN 2 0xf0f0')
        .findAndDelete(Script('2 0xf0f0'))
        .toString()
        .should.equal('OP_RETURN');
    });
    it('should do nothing', function() {
      Script('OP_RETURN 2 0xf0f0')
        .findAndDelete(Script('2 0xffff'))
        .toString()
        .should.equal('OP_RETURN 2 0xf0f0');
    });
  });


  describe('#checkMinimalPush', function() {

    it('should check these minimal pushes', function() {
      Script().add(1).checkMinimalPush(0).should.equal(true);
      Script().add(0).checkMinimalPush(0).should.equal(true);
      Script().add(-1).checkMinimalPush(0).should.equal(true);
      Script().add(1000).checkMinimalPush(0).should.equal(true);
      Script().add(0xffffffff).checkMinimalPush(0).should.equal(true);
      Script().add(0xffffffffffffffff).checkMinimalPush(0).should.equal(true);
      Script().add(new Buffer([0])).checkMinimalPush(0).should.equal(true);

      var buf = new Buffer(75);
      buf.fill(1);
      Script().add(buf).checkMinimalPush(0).should.equal(true);

      buf = new Buffer(76);
      buf.fill(1);
      Script().add(buf).checkMinimalPush(0).should.equal(true);

      buf = new Buffer(256);
      buf.fill(1);
      Script().add(buf).checkMinimalPush(0).should.equal(true);
    });

  });

  describe('getData returns associated data', function() {
    it('for a P2PKH address', function() {
      var address = Address.fromString('1NaTVwXDDUJaXDQajoa9MqHhz4uTxtgK14');
      var script = Script.buildPublicKeyHashOut(address);
      expect(BufferUtil.equal(script.getData(), address.hashBuffer)).to.be.true();
    });
    it('for a P2SH address', function() {
      var address = Address.fromString('3GhtMmAbWrUf6Y8vDxn9ETB14R6V7Br3mt');
      var script = new Script(address);
      expect(BufferUtil.equal(script.getData(), address.hashBuffer)).to.be.true();
    });
    it('for a standard opreturn output', function() {
      expect(BufferUtil.equal(Script('OP_RETURN 1 0xFF').getData(), new Buffer([255]))).to.be.true();
    });
    it('fails if content is not recognized', function() {
      expect(function() {
        return Script('1 0xFF').getData();
      }).to.throw();
    });
  });

  describe('toAddress', function() {
    var pubkey = new PublicKey('027ffeb8c7795d529ee9cd96512d472cefe398a0597623438ac5d066a64af50072');
    var liveAddress = pubkey.toAddress(Networks.livenet);
    var testAddress = pubkey.toAddress(Networks.testnet);

    it('priorize the network argument', function() {
      var script = new Script(liveAddress);
      script.toAddress(Networks.testnet).toString().should.equal(testAddress.toString());

      var s = new Script('OP_DUP OP_HASH160 20 0x06c06f6d931d7bfba2b5bd5ad0d19a8f257af3e3 OP_EQUALVERIFY OP_CHECKSIG');
      script.toAddress(Networks.testnet).network.should.equal(Networks.testnet);
    });
    it('use the inherited network', function() {
      var script = new Script(liveAddress);
      script.toAddress().toString().should.equal(liveAddress.toString());
      var script = new Script(testAddress);
      script.toAddress().toString().should.equal(testAddress.toString());
    });
    it('uses default network', function() {
      var script = new Script('OP_DUP OP_HASH160 20 0x06c06f6d931d7bfba2b5bd5ad0d19a8f257af3e3 OP_EQUALVERIFY OP_CHECKSIG');
      script.toAddress().network.should.equal(Networks.defaultNetwork);
    });
    it('for a P2PKH address', function() {
      var stringAddress = '1NaTVwXDDUJaXDQajoa9MqHhz4uTxtgK14';
      var address = new Address(stringAddress);
      var script = new Script(address);
      script.toAddress().toString().should.equal(stringAddress);
    });
    it('for a P2SH address', function() {
      var stringAddress = '3GhtMmAbWrUf6Y8vDxn9ETB14R6V7Br3mt';
      var address = new Address(stringAddress);
      var script = new Script(address);
      script.toAddress().toString().should.equal(stringAddress);
    });
    it('fails if content is not recognized', function() {
      expect(function() {
        return Script().toAddress(Networks.livenet);
      }).to.throw();
    });
  });

});