pragma solidity ^0.4.18;

/*

  Copyright AICT Foundation.
  https://www.aict.io/

*/

library SafeMath {

  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;
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a / b;
    return c;
  }


  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }


  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

contract Ownable {
  address public owner;


  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

  function Ownable() public {
    owner = msg.sender;
  }

  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) public view returns (uint256);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }

}

contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;

  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }

  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

contract BurnableToken is BasicToken {

  event Burn(address indexed burner, uint256 value);

  function burn(uint256 _value) public {
    require(_value <= balances[msg.sender]);
    address burner = msg.sender;
    balances[burner] = balances[burner].sub(_value);
    totalSupply_ = totalSupply_.sub(_value);
    Burn(burner, _value);
    Transfer(burner, address(0), _value);
  }
}

contract AICT is StandardToken, BurnableToken, Ownable {
    // Constants
    string  public constant name = "AICT";
    string  public constant symbol = "AICT";
    uint8   public constant decimals = 9;
    uint256 public constant INITIAL_SUPPLY      = 500000000 * (10 ** uint256(decimals));

    uint public amountRaised;
    uint256 public buyPrice = 0;
    bool public crowdsaleClosed;

    function AICT() public {
    	totalSupply_ = INITIAL_SUPPLY;
      balances[msg.sender] = INITIAL_SUPPLY;
      Transfer(0x0, msg.sender, INITIAL_SUPPLY);
  	}

    function _transfer(address _from, address _to, uint _value) internal {     
        require (balances[_from] >= _value);
        require (balances[_to] + _value > balances[_to]);
   
        balances[_from] -= _value;
        balances[_to] += _value;
        Transfer(_from, _to, _value);
    }

    function setPrices(bool closebuy, uint256 newBuyPrice) onlyOwner public {
        crowdsaleClosed=closebuy;
        buyPrice = newBuyPrice;
    }

    function () payable public{
        require(!crowdsaleClosed);
        uint amount = msg.value ;
        amountRaised+=amount;
        _transfer(owner, msg.sender, amount * buyPrice);
    }

    function safeWithdrawal() onlyOwner public {
       owner.transfer(amountRaised);
    }

    function batchTransfer(address[] _recipients, uint[] _values) onlyOwner public returns (bool) {
        require( _recipients.length > 0 && _recipients.length == _values.length);

        uint total = 0;
        for(uint i = 0; i < _values.length; i++){
            total = total.add(_values[i]);
        }
        require(total <= balances[msg.sender]);

        for(uint j = 0; j < _recipients.length; j++){
            balances[_recipients[j]] = balances[_recipients[j]].add(_values[j]);
            Transfer(msg.sender, _recipients[j], _values[j]);
        }

        balances[msg.sender] = balances[msg.sender].sub(total);
        return true;
    }
}