pragma solidity ^0.4.24;

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * 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);
}

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address public owner;


    event OwnershipRenounced(address indexed previousOwner);
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );


    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor() public {
        owner = msg.sender;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipRenounced(owner);
        owner = address(0);
    }
}

library SafeMath {
    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;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(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;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);
        return c;
    }
}



/**
 * @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) {
        return _transfer(msg.sender, _to, _value);
    }

    function _transfer(address _from, address _to, uint256 _value ) internal returns (bool) {
        require(_to != address(0));
        require(_value <= balances[_from]);

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(_from, _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];
    }

}

/**
 * @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
    );
}


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/issues/20
 * 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(_value <= allowed[_from][msg.sender]);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        return _transfer(_from, _to, _value);
    }

    /**
     * @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,
        uint256 _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,
        uint256 _subtractedValue
    )
    public
    returns (bool)
    {
        uint256 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;
    }

}

/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */

contract BurnableToken is BasicToken {

    event Burn(address indexed burner, uint256 value);

    /**
     * @dev Burns a specific amount of tokens.
     * @param _value The amount of token to be burned.
     */
    function burn(uint256 _value) public {
        _burn(msg.sender, _value);
    }

    function _burn(address _who, uint256 _value) internal {
        require(_value <= balances[_who]);
        // no need to require value <= totalSupply, since that would imply the
        // sender's balance is greater than the totalSupply, which *should* be an assertion failure

        balances[_who] = balances[_who].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);
        emit Burn(_who, _value);
        emit Transfer(_who, address(0), _value);
    }
}

/**
 * @title Standard Burnable Token
 * @dev Adds burnFrom method to ERC20 implementations
 */

contract StandardBurnableToken is BurnableToken, StandardToken {

    /**
     * @dev Burns a specific amount of tokens from the target address and decrements allowance
     * @param _from address The address which you want to send tokens from
     * @param _value uint256 The amount of token to be burned
     */
    function burnFrom(address _from, uint256 _value) public {
        require(_value <= allowed[_from][msg.sender]);
        // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
        // this function needs to emit an event with the updated approval.
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        _burn(_from, _value);
    }
}

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
    event Pause();
    event Unpause();

    bool public paused = false;


    /**
     * @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();
    }
}

/**
 * @title Pausable token
 * @dev StandardToken modified with pausable transfers.
 **/
contract PausableToken is StandardToken, Pausable {

    function transfer(
        address _to,
        uint256 _value
    )
    public
    whenNotPaused
    returns (bool)
    {
        return super.transfer(_to, _value);
    }

    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    )
    public
    whenNotPaused
    returns (bool)
    {
        return super.transferFrom(_from, _to, _value);
    }

    function approve(
        address _spender,
        uint256 _value
    )
    public
    whenNotPaused
    returns (bool)
    {
        return super.approve(_spender, _value);
    }

    function increaseApproval(
        address _spender,
        uint _addedValue
    )
    public
    whenNotPaused
    returns (bool success)
    {
        return super.increaseApproval(_spender, _addedValue);
    }

    function decreaseApproval(
        address _spender,
        uint _subtractedValue
    )
    public
    whenNotPaused
    returns (bool success)
    {
        return super.decreaseApproval(_spender, _subtractedValue);
    }
}

/**
 * @title CHREMACOIN token
 **/
contract CHREMACOIN is StandardBurnableToken, PausableToken {
    using SafeMath for uint256;
    string public constant name = "CHREMACOIN";
    string public constant symbol = "CRMC";
    uint8 public constant decimals = 8;
    uint256 public constant INITIAL_SUPPLY = 5000000000000000;

    struct lockedUserInfo{
        address lockedUserAddress;
        uint firstUnlockTime;
        uint secondUnlockTime;
        uint thirdUnlockTime;
        uint256 firstUnlockValue;
        uint256 secondUnlockValue;
        uint256 thirdUnlockValue;
    }

    mapping(address => lockedUserInfo) private lockedUserEntity;
    mapping(address => bool) private supervisorEntity;
    mapping(address => bool) private lockedWalletEntity;

    modifier onlySupervisor() {
        require(owner == msg.sender || supervisorEntity[msg.sender]);
        _;
    }

    event Unlock(
        address indexed lockedUser,
        uint lockPeriod,
        uint256 firstUnlockValue,
        uint256 secondUnlockValue,
        uint256 thirdUnlockValue
    );

    event PrintLog(
        address indexed sender,
        string _logName,
        uint256 _value
    );

    constructor() public {
        totalSupply_ = INITIAL_SUPPLY;
        balances[msg.sender] = INITIAL_SUPPLY;
        emit Transfer(0x0, msg.sender, INITIAL_SUPPLY);
    }

    function _transfer(address _from, address _to, uint256 _value ) internal returns (bool) {
        require(!isLockedWalletEntity(_from), "this wallet is locked");
      
        uint256 availableValue = getAvailableWithdrawableCount(_from, _value);
        emit PrintLog(_to, "availableResultValue", availableValue);
        require(availableValue > 0);

        return super._transfer(_from, _to, _value);
    } 


    function transfer( address _to, uint256 _value ) public whenNotPaused returns (bool) {
        require(msg.sender != _to,"Check your address!!");
        return super.transfer(_to, _value);
    }

    
    function transferFrom(address _from, address _to, uint256 _value ) public whenNotPaused returns (bool) {
        return super.transferFrom(_from, _to, _value);
    }


    function burn(uint256 _value) onlySupervisor public {
        super._burn(msg.sender, _value);
    }

    function transferToLockedBalance(
        address _to,
        uint _firstUnlockTime,
        uint256 _firstUnlockValue,
        uint _secondUnlockTime,
        uint256 _secondUnlockValue,
        uint _thirdUnlockTime,
        uint256 _thirdUnlockValue
    ) onlySupervisor whenNotPaused public returns (bool) {
        require(msg.sender != _to,"Check your address!!");
        require(_firstUnlockTime > now && _firstUnlockValue > 0, "Check your First input values!!;");

        uint256 totalLockSendCount = totalLockSendCount.add(_firstUnlockValue);

        if(_secondUnlockTime > now && _secondUnlockValue > 0){
            require(_secondUnlockTime > _firstUnlockTime, "Second Unlock time must be greater than First Unlock Time!!");

            totalLockSendCount = totalLockSendCount.add(_secondUnlockValue);
        }

        if(_thirdUnlockTime > now && _thirdUnlockValue > 0){
            require(_thirdUnlockTime > _secondUnlockTime && _secondUnlockTime > now &&  _secondUnlockValue > 0,
                "Check your third Unlock Time or Second input values!!");
            totalLockSendCount = totalLockSendCount.add(_thirdUnlockValue);
        }

        if (transfer(_to, totalLockSendCount)) {
            lockedUserEntity[_to].lockedUserAddress = _to;
            lockedUserEntity[_to].firstUnlockTime = _firstUnlockTime;
            lockedUserEntity[_to].firstUnlockValue = _firstUnlockValue;

            if(_secondUnlockTime > now && _secondUnlockValue > 0){
                lockedUserEntity[_to].secondUnlockTime = _secondUnlockTime;
                lockedUserEntity[_to].secondUnlockValue = _secondUnlockValue;
            }

            if(_thirdUnlockTime > now && _thirdUnlockValue > 0){
                lockedUserEntity[_to].thirdUnlockTime  = _thirdUnlockTime;
                lockedUserEntity[_to].thirdUnlockValue = _thirdUnlockValue;
            }

            return true;
        }
    }

    function setLockTime(address _to, uint _time, uint256 _lockTime) onlySupervisor public returns(bool){
        require(_to !=address(0) && _time > 0 && _time < 4 && _lockTime > now);

        (   uint firstUnlockTime,
        uint secondUnlockTime,
        uint thirdUnlockTime
        ) = getLockedTimeUserInfo(_to);

        if(_time == 1 && firstUnlockTime !=0){
            if(secondUnlockTime ==0 || _lockTime < secondUnlockTime){
                lockedUserEntity[_to].firstUnlockTime = _lockTime;
                return true;
            }
        }else if(_time == 2 && secondUnlockTime !=0){
            if(_lockTime > firstUnlockTime && (thirdUnlockTime ==0 || _lockTime < thirdUnlockTime)){
                lockedUserEntity[_to].secondUnlockTime = _lockTime;
                return true;
            }
        }else if(_time == 3 && thirdUnlockTime !=0 && _lockTime > secondUnlockTime){
            lockedUserEntity[_to].thirdUnlockTime = _lockTime;
            return true;
        }
        return false;
    }

    function getLockedUserInfo(address _address) view public returns (uint,uint256,uint,uint256,uint,uint256){
        require(msg.sender == _address || msg.sender == owner || supervisorEntity[msg.sender]);
        return _getLockedUserInfo(_address);
    }

    function _getLockedUserInfo(address _address) view internal returns (uint,uint256,uint,uint256,uint,uint256){        
        return (
        lockedUserEntity[_address].firstUnlockTime,
        lockedUserEntity[_address].firstUnlockValue,
        lockedUserEntity[_address].secondUnlockTime,
        lockedUserEntity[_address].secondUnlockValue,
        lockedUserEntity[_address].thirdUnlockTime,
        lockedUserEntity[_address].thirdUnlockValue
        );
    }

    function setSupervisor(address _address) onlyOwner public returns (bool){
        require(_address !=address(0) && !supervisorEntity[_address]);
        supervisorEntity[_address] = true;
        emit PrintLog(_address, "isSupervisor",  1);
        return true;
    }

    function removeSupervisor(address _address) onlyOwner public returns (bool){
        require(_address !=address(0) && supervisorEntity[_address]);
        delete supervisorEntity[_address];
        emit PrintLog(_address, "isSupervisor",  0);
        return true;
    }

    function setLockedWalletEntity(address _address) onlySupervisor public returns (bool){
        require(_address !=address(0) && !lockedWalletEntity[_address]);
        lockedWalletEntity[_address] = true;
        emit PrintLog(_address, "isLockedWalletEntity",  1);
        return true;
    }

    function removeLockedWalletEntity(address _address) onlySupervisor public returns (bool){
        require(_address !=address(0) && lockedWalletEntity[_address]);
        delete lockedWalletEntity[_address];
        emit PrintLog(_address, "isLockedWalletEntity",  0);
        return true;
    }

    function getLockedTimeUserInfo(address _address) view private returns (uint,uint,uint){
        require(msg.sender == _address || msg.sender == owner || supervisorEntity[msg.sender]);
        return (
        lockedUserEntity[_address].firstUnlockTime,
        lockedUserEntity[_address].secondUnlockTime,
        lockedUserEntity[_address].thirdUnlockTime
        );
    }

    function isSupervisor() view onlyOwner private returns (bool){
        return supervisorEntity[msg.sender];
    }

    function isLockedWalletEntity(address _from) view private returns (bool){
        return lockedWalletEntity[_from];
    }

    function getAvailableWithdrawableCount( address _from , uint256 _sendOrgValue) private returns (uint256) {
        uint256 availableValue = 0;

        if(lockedUserEntity[_from].lockedUserAddress == address(0)){
            availableValue = _sendOrgValue;
        }else{
            (
            uint firstUnlockTime, uint256 firstUnlockValue,
            uint secondUnlockTime, uint256 secondUnlockValue,
            uint thirdUnlockTime, uint256 thirdUnlockValue
            ) = _getLockedUserInfo(_from);

            if(now < firstUnlockTime) {
                availableValue = balances[_from].sub(firstUnlockValue.add(secondUnlockValue).add(thirdUnlockValue));
                if(_sendOrgValue > availableValue){
                    availableValue = 0;
                }else{
                    availableValue = _sendOrgValue;
                }
            }else if(firstUnlockTime <= now && secondUnlockTime ==0){
                availableValue = balances[_from];
                if(_sendOrgValue > availableValue){
                    availableValue = 0;
                }else{
                    availableValue = _sendOrgValue;
                    delete lockedUserEntity[_from];
                    emit Unlock(_from, 1, firstUnlockValue, secondUnlockValue, thirdUnlockValue);
                }
            }else if(firstUnlockTime <= now && secondUnlockTime !=0 && now < secondUnlockTime){
                availableValue = balances[_from].sub(secondUnlockValue.add(thirdUnlockValue));
                if(_sendOrgValue > availableValue){
                    availableValue = 0;
                }else{
                    availableValue = _sendOrgValue;
                    lockedUserEntity[_from].firstUnlockValue = 0;
                    emit Unlock(_from, 1, firstUnlockValue, secondUnlockValue, thirdUnlockValue);
                }
            }else if(secondUnlockTime !=0 && secondUnlockTime <= now && thirdUnlockTime ==0){
                availableValue = balances[_from];
                if(_sendOrgValue > availableValue){
                    availableValue = 0;
                }else{
                    availableValue =_sendOrgValue;
                    delete lockedUserEntity[_from];
                    emit Unlock(_from, 2, firstUnlockValue, secondUnlockValue, thirdUnlockValue);
                }
            }else if(secondUnlockTime !=0 && secondUnlockTime <= now && thirdUnlockTime !=0 && now < thirdUnlockTime){
                availableValue = balances[_from].sub(thirdUnlockValue);
                if(_sendOrgValue > availableValue){
                    availableValue = 0;
                }else{
                    availableValue = _sendOrgValue;
                    lockedUserEntity[_from].firstUnlockValue = 0;
                    lockedUserEntity[_from].secondUnlockValue = 0;
                    emit Unlock(_from, 2, firstUnlockValue, secondUnlockValue, thirdUnlockValue);
                }
            }else if(thirdUnlockTime !=0 && thirdUnlockTime <= now){
                availableValue = balances[_from];
                if(_sendOrgValue > availableValue){
                    availableValue = 0;
                }else if(_sendOrgValue <= availableValue){
                    availableValue = _sendOrgValue;
                    delete lockedUserEntity[_from];
                    emit Unlock(_from, 3, firstUnlockValue, secondUnlockValue, thirdUnlockValue);
                }
            }
        }
        return availableValue;
    }

}