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var Blockchain = require("./blockchain.js");
var Block = require("./block.js");

var difficulty = 7;  // number of zeroes in the hash key
var blockchain = new Blockchain(difficulty);
var currentBlock, prevBlock, genesisBlock;

(function Main() {
    var i; // counter
    genesisBlock = new Block("Hello Blockchain");

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function BlockChain(difficulty) {
	
	this.blocks = [];
	this.difficulty = difficulty;

	this.add = function(block) {  // a new kid on the blockchain
		this.blocks.push(block);
	}

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var sha256 = require("sha256");
var method = Block.prototype;

function Block(data, previousHash) {
	if(typeof previousHash === "undefined") previousHash = "genesis_block";
	this._previousHash = previousHash;
	this._data = JSON.stringify({ data: data });
	this._nonce = 0;
	this._timeStamp = new Date().getTime();		
	this._hash = this.computeHash(); // constructor    

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/*
	Cross-browser hasOwnProperty solution, based on answers from:
	http://stackoverflow.com/questions/135448/how-do-i-check-to-see-if-an-object-has-an-attribute-in-javascript
*/
if ( !Object.prototype.hasOwnProperty ) {
	Object.prototype.hasOwnProperty = function(prop) {
		var proto = obj.__proto__ || obj.constructor.prototype;
		return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]);
	};
}