'use strict';

var bitcore = require('..');
var BN = require('../lib/crypto/bn');
var BufferReader = bitcore.encoding.BufferReader;
var BufferWriter = bitcore.encoding.BufferWriter;
var BlockHeader = bitcore.BlockHeader;
var Block = bitcore.Block;
var chai = require('chai');
var fs = require('fs');
var should = chai.should();
var Transaction = bitcore.Transaction;

// https://test-insight.bitpay.com/block/000000000b99b16390660d79fcc138d2ad0c89a0d044c4201a02bdf1f61ffa11
var dataRawBlockBuffer = fs.readFileSync('test/data/blk86756-testnet.dat');
var dataRawBlockBinary = fs.readFileSync('test/data/blk86756-testnet.dat', 'binary');
var dataJson = fs.readFileSync('test/data/blk86756-testnet.json').toString();
var data = require('./data/blk86756-testnet');
var dataBlocks = require('./data/bitcoind/blocks');

describe('Block', function() {

  var blockhex = data.blockhex;
  var blockbuf = new Buffer(blockhex, 'hex');
  var bh = BlockHeader.fromBuffer(new Buffer(data.blockheaderhex, 'hex'));
  var txs = [];
  JSON.parse(dataJson).transactions.forEach(function(tx) {
    txs.push(new Transaction().fromJSON(tx));
  });
  var json = dataJson;

  var genesishex = '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';
  var genesisbuf = new Buffer(genesishex, 'hex');
  var genesisidhex = '000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f';
  var blockOneHex = '010000006fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000982051fd1e4ba744bbbe680e1fee14677ba1a3c3540bf7b1cdb606e857233e0e61bc6649ffff001d01e362990101000000010000000000000000000000000000000000000000000000000000000000000000ffffffff0704ffff001d0104ffffffff0100f2052a0100000043410496b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be63c52da7589379515d4e0a604f8141781e62294721166bf621e73a82cbf2342c858eeac00000000';
  var blockOneBuf = new Buffer(blockOneHex, 'hex');
  var blockOneId = '00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048';

  it('should make a new block', function() {
    var b = Block(blockbuf);
    b.toBuffer().toString('hex').should.equal(blockhex);
  });

  it('should not make an empty block', function() {
    (function() {
      return new Block();
    }).should.throw('Unrecognized argument for Block');
  });

  describe('#constructor', function() {

    it('should set these known values', function() {
      var b = new Block({
        header: bh,
        transactions: txs
      });
      should.exist(b.header);
      should.exist(b.transactions);
    });

    it('should properly deserialize blocks', function() {
      dataBlocks.forEach(function(block) {
        var b = Block.fromBuffer(new Buffer(block.data, 'hex'));
        b.transactions.length.should.equal(block.transactions);
      });
    });

  });

  describe('#fromRawBlock', function() {

    it('should instantiate from a raw block binary', function() {
      var x = Block.fromRawBlock(dataRawBlockBinary);
      x.header.version.should.equal(2);
      new BN(x.header.bits).toString('hex').should.equal('1c3fffc0');
    });

    it('should instantiate from raw block buffer', function() {
      var x = Block.fromRawBlock(dataRawBlockBuffer);
      x.header.version.should.equal(2);
      new BN(x.header.bits).toString('hex').should.equal('1c3fffc0');
    });

  });

  describe('#fromJSON', function() {

    it('should set these known values', function() {
      var block = Block.fromJSON(json);
      should.exist(block.header);
      should.exist(block.transactions);
    });

    it('should set these known values', function() {

      var block = Block(json);
      should.exist(block.header);
      should.exist(block.transactions);
    });

  });

  describe('#toJSON', function() {

    it('should recover these known values', function() {
      var block = Block.fromJSON(json);
      var b = JSON.parse(block.toJSON());
      should.exist(b.header);
      should.exist(b.transactions);
    });

  });

  describe('#fromString/#toString', function() {

    it('should output/input a block hex string', function() {
      var b = Block.fromString(blockhex);
      b.toString().should.equal(blockhex);
    });

  });

  describe('#fromBuffer', function() {

    it('should make a block from this known buffer', function() {
      var block = Block.fromBuffer(blockbuf);
      block.toBuffer().toString('hex').should.equal(blockhex);
    });

  });

  describe('#fromBufferReader', function() {

    it('should make a block from this known buffer', function() {
      var block = Block.fromBufferReader(BufferReader(blockbuf));
      block.toBuffer().toString('hex').should.equal(blockhex);
    });

  });

  describe('#toBuffer', function() {

    it('should recover a block from this known buffer', function() {
      var block = Block.fromBuffer(blockbuf);
      block.toBuffer().toString('hex').should.equal(blockhex);
    });

  });

  describe('#toBufferWriter', function() {

    it('should recover a block from this known buffer', function() {
      var block = Block.fromBuffer(blockbuf);
      block.toBufferWriter().concat().toString('hex').should.equal(blockhex);
    });

    it('doesn\'t create a bufferWriter if one provided', function() {
      var writer = new BufferWriter();
      var block = Block.fromBuffer(blockbuf);
      block.toBufferWriter(writer).should.equal(writer);
    });

  });

  describe('#toObject', function() {

    it('should recover a block from genesis block buffer', function() {
      var block = Block.fromBuffer(blockOneBuf);
      block.id.should.equal(blockOneId);
      block.toObject().should.deep.equal({
        header: {
          version: 1,
          prevHash: '000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f',
          merkleRoot: '0e3e2357e806b6cdb1f70b54c3a3a17b6714ee1f0e68bebb44a74b1efd512098',
          time: 1231469665,
          bits: 486604799,
          nonce: 2573394689
        },
        transactions: [{
          version: 1,
          inputs: [{
            prevTxId: '0000000000000000000000000000000000000000000000000000000000000000',
            outputIndex: 4294967295,
            sequenceNumber: 4294967295,
            script: '4 0xffff001d 1 0x04'
          }],
          outputs: [{
            satoshis: 5000000000,
            script: '65 0x0496b538e853519c726a2c91e61ec11600ae1390813a627c66fb8be7947be' +
              '63c52da7589379515d4e0a604f8141781e62294721166bf621e73a82cbf2342c858ee OP_CHECKSIG'
          }],
          nLockTime: 0
        }]
      });
    });

    it('roundtrips correctly', function() {
      var block = Block.fromBuffer(blockOneBuf);
      var obj = block.toObject();
      var block2 = Block.fromObject(obj);
      block2.toObject().should.deep.equal(block.toObject());
    });

  });

  describe('#_getHash', function() {

    it('should return the correct hash of the genesis block', function() {
      var block = Block.fromBuffer(genesisbuf);
      var blockhash = new Buffer(Array.apply([], new Buffer(genesisidhex, 'hex')).reverse());
      block._getHash().toString('hex').should.equal(blockhash.toString('hex'));
    });
  });

  describe('#id', function() {

    it('should return the correct id of the genesis block', function() {
      var block = Block.fromBuffer(genesisbuf);
      block.id.should.equal(genesisidhex);
    });
    it('"hash" should be the same as "id"', function() {
      var block = Block.fromBuffer(genesisbuf);
      block.id.should.equal(block.hash);
    });

  });

  describe('#inspect', function() {

    it('should return the correct inspect of the genesis block', function() {
      var block = Block.fromBuffer(genesisbuf);
      block.inspect().should.equal('<Block ' + genesisidhex + '>');
    });

  });

  describe('#merkleRoot', function() {

    it('should describe as valid merkle root', function() {
      var x = Block.fromRawBlock(dataRawBlockBinary);
      var valid = x.validMerkleRoot();
      valid.should.equal(true);
    });

    it('should describe as invalid merkle root', function() {
      var x = Block.fromRawBlock(dataRawBlockBinary);
      x.transactions.push(new Transaction());
      var valid = x.validMerkleRoot();
      valid.should.equal(false);
    });

    it('should get a null hash merkle root', function() {
      var x = Block.fromRawBlock(dataRawBlockBinary);
      x.transactions = []; // empty the txs
      var mr = x.getMerkleRoot();
      mr.should.deep.equal(Block.Values.NULL_HASH);
    });

  });

});