pragma solidity ^0.4.13;

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;

    require(c / a == b);

    return c;

  }



  /**

  * @dev Integer division of two numbers, truncating the quotient.

  */

  function div(uint256 a, uint256 b) internal pure returns (uint256) {

    require(b > 0); // Solidity automatically throws when dividing by 0

    uint256 c = a / b;

    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) {

    require(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;

    require(c >= a);

    return c;

  }

}

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_;

  /**
  * @dev total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  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);
    emit Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256) {
    return balances[_owner];
  }

}

contract Ownable 

{

  address public owner;

 

  constructor(address _owner) public 

  {

    owner = _owner;

  }

 

  modifier onlyOwner() 

  {

    require(msg.sender == owner);

    _;

  }

 

  function transferOwnership(address newOwner) onlyOwner 

  {

    require(newOwner != address(0));      

    owner = newOwner;

  }

}

contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  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);
    emit Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   *
   * Beware that changing an allowance with this method brings the risk that someone may use both the old
   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(
    address _owner,
    address _spender
   )
    public
    view
    returns (uint256)
  {
    return allowed[_owner][_spender];
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   *
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(
    address _spender,
    uint _addedValue
  )
    public
    returns (bool)
  {
    allowed[msg.sender][_spender] = (
      allowed[msg.sender][_spender].add(_addedValue));
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   *
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  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);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

contract BiLinkToken is StandardToken, Ownable {
	string public name = "BiLink"; 
	string public symbol = "BLK";
	uint256 public decimals = 18;
	uint256 public INITIAL_SUPPLY = 10000 * 10000 * (10 ** decimals);
	bool public mintingFinished = false;
	uint256 public totalMintableAmount;

	address public contractBalance;

	address public accountFoundation;
	address public accountCompany;
	address public accountPartnerBase;
	mapping (address => uint256) public lockedAccount2WithdrawTap;
	mapping (address => uint256) public lockedAccount2WithdrawedAmount;
	uint256 public lockStartTime;
	uint256 public lockEndTime;
	uint256 public releaseEndTime;
	uint256 public tapOfOne;
	uint256 public amountMinted;
	uint256 public lockTimeSpan;

	address[] public accountsCanShareProfit;//balance > 10000 * (10 ** decimals)
	uint256 public amountMinCanShareProfit;

	event Burn(address indexed burner, uint256 value);
	event Mint(address indexed to, uint256 amount);
	event MintFinished();

	constructor(address _owner, address _accountFoundation, address _accountCompany, address _accountPartnerBase) public 
		Ownable(_owner)
	{
		totalSupply_ = INITIAL_SUPPLY* 70/ 100;
		accountFoundation= _accountFoundation;
		accountCompany= _accountCompany;
		accountPartnerBase= _accountPartnerBase;

		lockStartTime= now;
		lockTimeSpan= 1 * 365 * 24 * 3600;
		lockEndTime= now+ lockTimeSpan;
		releaseEndTime= now+ 2 * lockTimeSpan;

		balances[accountCompany]= INITIAL_SUPPLY* 40/ 100;
		balances[accountFoundation]= INITIAL_SUPPLY* 10/ 100;
		balances[accountPartnerBase]= INITIAL_SUPPLY* 20/ 100;

		tapOfOne= (10 ** decimals)/ (lockTimeSpan);
		lockedAccount2WithdrawTap[accountCompany]= tapOfOne.mul(balances[accountCompany]);
		lockedAccount2WithdrawTap[accountPartnerBase]= tapOfOne.mul(balances[accountPartnerBase]);

		accountsCanShareProfit.push(accountCompany);
		accountsCanShareProfit.push(accountFoundation);
		accountsCanShareProfit.push(accountPartnerBase);

		amountMinCanShareProfit= 10000 * (10 ** decimals);
		totalMintableAmount= INITIAL_SUPPLY * 30/ 100;
	}

	function setMintAndBurnOwner (address _contractBalance) public onlyOwner {
		contractBalance= _contractBalance;
	}

	function burn(uint256 _amount) public {
		require(msg.sender== contractBalance);
		require(_amount <= balances[msg.sender]);

		balances[msg.sender] = balances[msg.sender].sub(_amount);
		totalSupply_ = totalSupply_.sub(_amount);
		emit Burn(msg.sender, _amount);
		emit Transfer(msg.sender, address(0), _amount);
	}

	function transferToPartnerAccount(address _partner, uint256 _amount) onlyOwner {
		require(balances[accountPartnerBase].sub(_amount) > 0);

		balances[_partner]= balances[_partner].add(_amount);
		balances[accountPartnerBase]= balances[accountPartnerBase].sub(_amount);

		lockedAccount2WithdrawTap[_partner]= tapOfOne.mul(balances[_partner]);

		if(balances[_partner].sub(_amount) < amountMinCanShareProfit&& balances[_partner] >= amountMinCanShareProfit)
			accountsCanShareProfit.push(_partner);
	}

	modifier canMint() {
		require(!mintingFinished);
		_;
	}

	modifier hasMintPermission() {
		require(msg.sender == contractBalance);
		_;
	}

	modifier canTransfer(address _from, address _to, uint256 _value)  {
        require(_from != accountFoundation&& (lockedAccount2WithdrawTap[_from] <= 0 || now >= releaseEndTime || (now >= lockEndTime && _value <= (lockedAccount2WithdrawTap[_from].mul(now.sub(lockStartTime))).sub(lockedAccount2WithdrawedAmount[_from]))));
        _;
    }

	function mintFinished() public constant returns (bool) {
		return mintingFinished;
	}

	function mint(address _to, uint256 _amount)
		hasMintPermission
		canMint
		public
		returns (bool)
	{
		uint256 _actualMintAmount= _amount.mul(totalMintableAmount- amountMinted).div(totalMintableAmount);
		if(amountMinted.add(_actualMintAmount) > totalMintableAmount) {
			finishMinting();
			return false;
		}
		else {
			amountMinted= amountMinted.add(_actualMintAmount);
			totalSupply_ = totalSupply_.add(_actualMintAmount);
			balances[_to] = balances[_to].add(_actualMintAmount);

			emit Mint(_to, _actualMintAmount);
			emit Transfer(address(0), _to, _actualMintAmount);
			return true;
		}
	}

	function finishMinting() canMint private returns (bool) {
		mintingFinished = true;
		emit MintFinished();
		return true;
	}

	function preTransfer(address _from, address _to, uint256 _value) private {
		if(lockedAccount2WithdrawTap[_from] > 0)
			lockedAccount2WithdrawedAmount[_from]= lockedAccount2WithdrawedAmount[_from].add(_value);

		if(balances[_from] >= amountMinCanShareProfit && balances[_from].sub(_value) < amountMinCanShareProfit) {
			for(uint256 i= 0; i< accountsCanShareProfit.length; i++) {

				if(accountsCanShareProfit[i]== _from) {

					if(i< accountsCanShareProfit.length- 1&& accountsCanShareProfit.length> 1)

						accountsCanShareProfit[i]= accountsCanShareProfit[accountsCanShareProfit.length- 1];

					delete accountsCanShareProfit[accountsCanShareProfit.length- 1];

					accountsCanShareProfit.length--;

					break;

				}

			}
		}

		if(balances[_to] < amountMinCanShareProfit&& balances[_to].add(_value) >= amountMinCanShareProfit) {
			accountsCanShareProfit.push(_to);
		}
	}

	function transfer(address _to, uint256 _value) public canTransfer(msg.sender, _to, _value) returns (bool) {
		preTransfer(msg.sender, _to, _value);

        return super.transfer(_to, _value);
    }

    function transferFrom(address _from, address _to, uint256 _value) public canTransfer(_from, _to, _value) returns (bool) {
		preTransfer(_from, _to, _value);

        return super.transferFrom(_from, _to, _value);
    }

    function approve(address _spender, uint256 _value) public canTransfer(msg.sender, _spender, _value) returns (bool) {
        return super.approve(_spender,_value);
    }

	function getCanShareProfitAccounts() public constant returns (address[]) {
		return accountsCanShareProfit;
	}
}