// File: BasicToken.sol



pragma solidity ^0.4.18;


import "./ERC20Basic.sol";
import "./SafeMath.sol";


/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
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]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    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 balance) {
    return balances[_owner];
  }

}

// File: CoinWord.sol



pragma solidity ^0.4.24;
import './StandardToken.sol';

// ERC20 standard token
contract CoinWord is StandardToken {
    address public admin; 
    string public name = "CoinWord Token"; 
    string public symbol = "CWT"; 
    uint8 public decimals = 18; 
    uint256 public INITIAL_SUPPLY = 500000000000000000000000000; 
    
    mapping (address => bool) public frozenAccount; 
    mapping (address => uint256) public frozenTimestamp; 
    
    event Pause();
    event Unpause();

    bool public paused = false;

    bool public exchangeFlag = false; 

    // The excess eth returned to the original account if the conditions were not met or the fund was raised.
    uint256 public minWei = 1000;  //Minimum hit 1 wei  1eth = 1*10^18 wei
    uint256 public maxWei = 20000000000000000000000; 
    uint256 public maxRaiseAmount = 2000000000000000000000000; 
    uint256 public raisedAmount = 0; 
    uint256 public raiseRatio = 200000; // Exchange ratio 1 eth = 200,000 token
    // event
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    
    constructor() public {
        totalSupply_ = INITIAL_SUPPLY;
        admin = msg.sender;
        balances[msg.sender] = INITIAL_SUPPLY;
    }

    // Triggered by fallback calling a non-contractual function to the contractual address transferor
    // Token automatic exchange eth
    function()
    public whenNotPaused payable {
        require(msg.value > 0);
        if (exchangeFlag) {
            if (msg.value >= minWei && msg.value <= maxWei){
                if (raisedAmount < maxRaiseAmount) {
                    uint256 valueNeed = msg.value;
                    raisedAmount = raisedAmount.add(msg.value);
                    if (raisedAmount > maxRaiseAmount) {
                        uint256 valueLeft = raisedAmount.sub(maxRaiseAmount);
                        valueNeed = msg.value.sub(valueLeft);
                        msg.sender.transfer(valueLeft);
                        raisedAmount = maxRaiseAmount;
                    }
                    if (raisedAmount >= maxRaiseAmount) {
                        exchangeFlag = false;
                    }
                    
                    uint256 _value = valueNeed.mul(raiseRatio);

                    require(_value <= balances[admin]);
                    balances[admin] = balances[admin].sub(_value);
                    balances[msg.sender] = balances[msg.sender].add(_value);

                    emit Transfer(admin, msg.sender, _value);

                }
            } else {
                msg.sender.transfer(msg.value);
            }
        } else {
            msg.sender.transfer(msg.value);
        }
    }
    
    modifier onlyOwner() {
        require(msg.sender == admin);
    _;
    }

    
    function changeAdmin(
        address _newAdmin
    )
    public whenNotPaused
    returns (bool)  {
        require(msg.sender == admin);
        require(_newAdmin != address(0));
        balances[_newAdmin] = balances[_newAdmin].add(balances[admin]);
        balances[admin] = 0;
        admin = _newAdmin;
        return true;
    }
    
    function generateToken(
        address _target,
        uint256 _amount
    )
    public whenNotPaused
    returns (bool)  {
        require(msg.sender == admin);
        require(_target != address(0));
        balances[_target] = balances[_target].add(_amount);
        totalSupply_ = totalSupply_.add(_amount);
        INITIAL_SUPPLY = totalSupply_;
        return true;
    }
    
   
    function distroyToken(
        uint256 _values
    )
    public whenNotPaused
    returns (bool)  {
        require(msg.sender == admin);
        require(_values <= balances[msg.sender]);
        address _to = address(0);
        balances[_to] = balances[_to].add(_values);
        balances[msg.sender] = balances[msg.sender].sub(_values);
        emit Transfer(msg.sender, _to, _values);
        return true;
    }
    

    
    function withdraw (
        uint256 _amount
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        msg.sender.transfer(_amount);
        return true;
    }
    
    function freeze(
        address _target,
        bool _freeze
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        require(_target != address(0));
        frozenAccount[_target] = _freeze;
        return true;
    }
    
    function freezeWithTimestamp(
        address _target,
        uint256 _timestamp
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        require(_target != address(0));
        frozenTimestamp[_target] = _timestamp;
        return true;
    }

    
    function multiFreeze(
        address[] _targets,
        bool[] _freezes
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        require(_targets.length == _freezes.length);
        uint256 len = _targets.length;
        require(len > 0);
        for (uint256 i = 0; i < len; i = i.add(1)) {
            address _target = _targets[i];
            require(_target != address(0));
            bool _freeze = _freezes[i];
            frozenAccount[_target] = _freeze;
        }
        return true;
    }
    
    function multiFreezeWithTimestamp(
        address[] _targets,
        uint256[] _timestamps
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        require(_targets.length == _timestamps.length);
        uint256 len = _targets.length;
        require(len > 0);
        for (uint256 i = 0; i < len; i = i.add(1)) {
            address _target = _targets[i];
            require(_target != address(0));
            uint256 _timestamp = _timestamps[i];
            frozenTimestamp[_target] = _timestamp;
        }
        return true;
    }
   
    function multiTransfer(
        address[] _tos,
        uint256[] _values
    )
    public whenNotPaused
    returns (bool) {
        require(!frozenAccount[msg.sender]);
        require(now > frozenTimestamp[msg.sender]);
        require(_tos.length == _values.length);
        uint256 len = _tos.length;
        require(len > 0);
        uint256 amount = 0;
        for (uint256 i = 0; i < len; i = i.add(1)) {
            amount = amount.add(_values[i]);
        }
        require(amount <= balances[msg.sender]);
        for (uint256 j = 0; j < len; j = j.add(1)) {
            address _to = _tos[j];
            require(_to != address(0));
            balances[_to] = balances[_to].add(_values[j]);
            balances[msg.sender] = balances[msg.sender].sub(_values[j]);
            emit Transfer(msg.sender, _to, _values[j]);
        }
        return true;
    }
   
    function transfer(
        address _to,
        uint256 _value
    )
    public whenNotPaused
    returns (bool) {
        require(!frozenAccount[msg.sender]);
        require(now > frozenTimestamp[msg.sender]);
        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 transferFrom(
        address _from,
        address _to,
        uint256 _value
    )
    public whenNotPaused
    returns (bool)
    {
        require(!frozenAccount[_from]);
        require(now > frozenTimestamp[msg.sender]);
        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 whenNotPaused
    returns (bool) {
        
        // require(_value <= balances[msg.sender]);

        allowed[msg.sender][_spender] = _value;

        emit Approval(msg.sender, _spender, _value);
        return true;
    }
    
    
    function getFrozenTimestamp(
        address _target
    )
    public view
    returns (uint256) {
        require(_target != address(0));
        return frozenTimestamp[_target];
    }
    
    function getFrozenAccount(
        address _target
    )
    public view
    returns (bool) {
        require(_target != address(0));
        return frozenAccount[_target];
    }
    
    function getBalance()
    public view
    returns (uint256) {
        return address(this).balance;
    }
    
    function setName (
        string _value
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        name = _value;
        return true;
    }
    
    function setSymbol (
        string _value
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        symbol = _value;
        return true;
    }

    
    function setExchangeFlag (
        bool _flag
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        exchangeFlag = _flag;
        return true;

    }
   
    function setMinWei (
        uint256 _value
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        minWei = _value;
        return true;

    }
    
    function setMaxWei (
        uint256 _value
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        maxWei = _value;
        return true;
    }
    
    function setMaxRaiseAmount (
        uint256 _value
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        maxRaiseAmount = _value;
        return true;
    }

    
    function setRaisedAmount (
        uint256 _value
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        raisedAmount = _value;
        return true;
    }

   
    function setRaiseRatio (
        uint256 _value
    )
    public whenNotPaused
    returns (bool) {
        require(msg.sender == admin);
        raiseRatio = _value;
        return true;
    }


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    emit Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    emit Unpause();
  }
}



// File: ERC20.sol



pragma solidity ^0.4.18;

import "./ERC20Basic.sol";


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
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);
}

// File: ERC20Basic.sol



pragma solidity ^0.4.18;


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
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);
}

// File: SafeMath.sol



pragma solidity ^0.4.18;


/**
 * @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;
  }
}

// File: StandardToken.sol



pragma solidity ^0.4.18;

import "./BasicToken.sol";
import "./ERC20.sol";


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
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);
    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;
    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);
    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);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}