pragma solidity ^0.4.24;

/**
* < 헬스메디 토큰 >
* Symbol : HM
* Name : HealthMediToken
* Total Supply : 10,000,000,000.000000000000000000
* 작성일 : 2018.05.31 
* 수정일 : 2018.08.23 
**/

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
  );
}

library SafeMath {

  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    if (a == 0) {
      return 0;
    }
    c = a * b;
    assert(c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    return a / b;
  }

  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 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}

contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;
  
  modifier onlyPayloadSize(uint size) {
      assert(msg.data.length >= size + 4);
      _;
  }

  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  function transfer(address _to, uint256 _value) public onlyPayloadSize(2 * 32) 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;
  }

  function balanceOf(address _owner) public view returns (uint256) {
    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);
    emit Transfer(_from, _to, _value);
    return true;
  }

  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    emit 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));
    emit 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);
    }
    emit 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 {
    _burn(msg.sender, _value);
  }

  function _burn(address _who, uint256 _value) internal {
    require(_value <= balances[_who]);

    balances[_who] = balances[_who].sub(_value);
    totalSupply_ = totalSupply_.sub(_value);
    emit Burn(_who, _value);
    emit Transfer(_who, address(0), _value);
  }
}

contract StandardBurnableToken is BurnableToken, StandardToken {

  function burnFrom(address _from, uint256 _value) public {
    require(_value <= allowed[_from][msg.sender]);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    _burn(_from, _value);
  }
}


contract Ownable {
  address public owner;

  event OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );

  constructor() public {
    owner = msg.sender;
  }

  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    emit OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }
}

contract MintableToken is StandardToken, Ownable {
  event Mint(address indexed to, uint256 amount);
  event MintFinished();

  bool public mintingFinished = false;


  modifier canMint() {
    require(!mintingFinished);
    _;
  }

  function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
    totalSupply_ = totalSupply_.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    emit Mint(_to, _amount);
    emit Transfer(address(0), _to, _amount);
    return true;
  }

  function finishMinting() onlyOwner canMint public returns (bool) {
    mintingFinished = true;
    emit MintFinished();
    return true;
  }
}

contract Blacklisted is Ownable {

  mapping(address => bool) public blacklist;

  /**
  * @dev Throws if called by any account other than the owner.
  */
  modifier notBlacklisted() {
    require(blacklist[msg.sender] == false);
    _;
  }

  /**
   * @dev Adds single address to blacklist.
   * @param _villain Address to be added to the blacklist
   */
  function addToBlacklist(address _villain) external onlyOwner {
    blacklist[_villain] = true;
  }

  /**
   * @dev Adds list of addresses to blacklist. Not overloaded due to limitations with truffle testing.
   * @param _villains Addresses to be added to the blacklist
   */
  function addManyToBlacklist(address[] _villains) external onlyOwner {
    for (uint256 i = 0; i < _villains.length; i++) {
      blacklist[_villains[i]] = true;
    }
  }

  /**
   * @dev Removes single address from blacklist.
   * @param _villain Address to be removed to the blacklist
   */
  function removeFromBlacklist(address _villain) external onlyOwner {
    blacklist[_villain] = false;
  }
}

contract HealthMediToken is Ownable, StandardBurnableToken, MintableToken, Blacklisted {
    
    string public name = "HealthMediToken";
    string public symbol = "HM";
    uint public decimals = 18;
    uint public INITIAL_SUPPLY = 10000000000 * 10 ** uint(decimals);
    
    bool public isUnlocked = false;
    
    constructor() public {
        totalSupply_ = INITIAL_SUPPLY;
        balances[msg.sender] = totalSupply_;
    }
    
    modifier onlyTransferable() {
        require(isUnlocked);
        _;
    }

    function transferFrom(address _from, address _to, uint256 _value) public onlyTransferable notBlacklisted returns (bool) {
      return super.transferFrom(_from, _to, _value);
    }
    
    function transfer(address _to, uint256 _value) public onlyTransferable notBlacklisted returns (bool) {
      return super.transfer(_to, _value);
    }
    
    function unlockTransfer() public onlyOwner {
      isUnlocked = true;
    }
    
    function lockTransfer() public onlyOwner {
      isUnlocked = false;
    }
}