// Vulnerability label: NC1
pragma solidity ^0.4.4;


/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {

 /**
 * @dev Multiplies two numbers, throws on overflow.
 */
 function mul(uint256 a, uint256 b) internal pure returns (uint256) {
   if (a == 0) {
     return 0;
   }
   uint256 c = a * b;
   assert(c / a == b);
   return c;
 }

 /**
 * @dev Integer division of two numbers, truncating the quotient.
 */
 function div(uint256 a, uint256 b) internal pure returns (uint256) {
   // assert(b > 0); // Solidity automatically throws when dividing by 0
   uint256 c = a / b;
   // assert(a == b * c + a % b); // There is no case in which this doesn't hold
   return c;
 }

 /**
 * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
 */
 function sub(uint256 a, uint256 b) internal pure returns (uint256) {
   assert(b <= a);
   return a - b;
 }

 /**
 * @dev Adds two numbers, throws on overflow.
 */
 function add(uint256 a, uint256 b) internal pure returns (uint256) {
   uint256 c = a + b;
   assert(c >= a);
   return c;
 }
}


contract Token {

    /// @return total amount of tokens
    function totalSupply() constant returns (uint256 supply) {}

    /// @param _owner The address from which the balance will be retrieved
    /// @return The balance
    function balanceOf(address _owner) constant returns (uint256 balance) {}

    /// @notice send `_value` token to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transfer(address _to, uint256 _value) returns (bool success) {}

    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}

    /// @notice `msg.sender` approves `_addr` to spend `_value` tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _value The amount of wei to be approved for transfer
    /// @return Whether the approval was successful or not
    function approve(address _spender, uint256 _value) returns (bool success) {}

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens allowed to spent
    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {}

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

}

contract StandardToken is Token {

    function transfer(address _to, uint256 _value) returns (bool success) {
        if (balances[msg.sender] >= _value && _value > 0) {
            balances[msg.sender] -= _value;
            balances[_to] += _value;
            Transfer(msg.sender, _to, _value);
            return true;
        } else { return false; }
    }

    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
        if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
            balances[_to] += _value;
            balances[_from] -= _value;
            allowed[_from][msg.sender] -= _value;
            Transfer(_from, _to, _value);
            return true;
        } else { return false; }
    }

    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
      return allowed[_owner][_spender];
    }

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
    uint256 public totalSupply;
}

contract CrystalReignShard is StandardToken {
  using SafeMath for uint;

    string public name; 
    uint8 public decimals;            
    string public symbol; 
    string public version = 'H1.0';
    uint256 public unitsOneEthCanBuy;
    uint256 public preSalePrice;
    uint256 public preAlphaPrice;
    uint256 public totalEthInWei;
    address public fundsWallet;
    address public dropWallet = 0x88d38F6cb2aF250Ab8f1FA24851ba312b0c48675;
    address public compWallet = 0xCf794896c1788F799dc141015b3aAae0721e7c27;
    address public marketingWallet = 0x49cc71a3a8c7D14Bf6a868717C81b248506402D8;
    uint256 public bonusETH = 0;
    uint256 public bonusCRS = 0;
    uint public start = 1519477200;
    uint public mintCount = 0;


    function CrystalReignShard() {
        balances[msg.sender] = 16400000000000000000000000;
        balances[dropWallet] = 16400000000000000000000000;
        balances[compWallet] = 16400000000000000000000000;
        balances[marketingWallet] = 80000000000000000000000;
        totalSupply = 50000000000000000000000000;                        
        name = "Crystal Reign Shard";                                  
        decimals = 18;                                              
        symbol = "CRS";                                           
        unitsOneEthCanBuy = 1000;                                      
        preSalePrice = 2000;
        preAlphaPrice = 1300;
        fundsWallet = msg.sender;                         
    }

    function() payable{
        totalEthInWei = totalEthInWei + msg.value;
        uint256 amount = msg.value * unitsOneEthCanBuy;
        if (now < 1521028800){
            amount = msg.value * preSalePrice;
        }
        else if (now < 1524571200) {
          amount = msg.value * preAlphaPrice;
        }
        if (balances[fundsWallet] < amount) {
            msg.sender.transfer(msg.value);
            return;
        }

        balances[fundsWallet] = balances[fundsWallet] - amount;
        balances[msg.sender] = balances[msg.sender] + amount;

        Transfer(fundsWallet, msg.sender, amount);

        fundsWallet.transfer(msg.value);
    }

    function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
        return true;
    }

    function mint(){
      if (now >= start + (5 years * mintCount) && msg.sender == fundsWallet) {
        balances[dropWallet] += 16400000000000000000000000;
        mintCount++;
        totalSupply += 16400000000000000000000000;
      }
    }

      function tileDrop(address[] winners) returns(bool success){
      if(msg.sender == fundsWallet){
        uint256 amount = 1000000000000000000000;
        for(uint winList = 0; winList < winners.length; winList++){
          winners[winList].transfer(bonusETH.div(64));
          balances[winners[winList]] = balances[winners[winList]] + amount;
          bonusETH -= bonusETH.div(64);
            if (balances[dropWallet] >= amount) {
            balances[dropWallet] = balances[dropWallet] - amount;
            balances[winners[winList]] = balances[winners[winList]] + bonusCRS.div(64);
            bonusCRS -= bonusCRS.div(64);
              }

          Transfer(dropWallet, msg.sender, amount); // Broadcast a message to the blockchain
        }

        balances[fundsWallet] = balances[fundsWallet] + bonusCRS;
        bonusCRS = 0;
        Transfer(fundsWallet, msg.sender, bonusETH); // Broadcast a message to the blockchain
        fundsWallet.transfer(bonusETH);
        bonusETH = 0;
        return true;
        }
        else{
        return false;
        }
        }

        function purchaseETH() payable returns(bool success){
          bonusETH +=  (msg.value.div(5)).mul(4);
          Transfer(fundsWallet, msg.sender, (msg.value.div(5)));
          fundsWallet.transfer(msg.value.div(5));
          return true;
        }

        function purchaseCRS(uint256 amount) public returns(bool success){//
          if(balances[msg.sender] >= amount){
            balances[fundsWallet] = balances[fundsWallet] + amount.div(5);
            bonusCRS += (amount.div(5)).mul(4);
            balances[msg.sender] = balances[msg.sender] - amount;
          }

          return true;
          }





}