contract BaseToken is Ownable
{
    using SafeMath for uint256;

    uint256 constant internal E18 = 1000000000000000000;
    uint256 constant public decimals = 18;
    uint256 public totalSupply;

    struct Lock {
        uint256 amount;
        uint256 expiresAt;
    }

    mapping (address => uint256) public balances;
    mapping (address => mapping ( address => uint256 )) public approvals;
    mapping (address => Lock[]) public lockup;
    mapping(address => bool) public lockedAddresses;

    
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    event Locked(address _who,uint256 _index);
    event UnlockedAll(address _who);
    event UnlockedIndex(address _who, uint256 _index);
    
    event Burn(address indexed from, uint256 indexed value);
    
    constructor() public
    {
        balances[msg.sender] = totalSupply;
    }

    modifier transferParamsValidation(address _from, address _to, uint256 _value)
    {
        require(_from != address(0));
        require(_to != address(0));
        require(_value > 0);
        require(balances[_from] >= _value);
        require(!isLocked(_from, _value));
        _;
    }
    
    modifier canTransfer(address _sender, uint256 _value) {
    require(!lockedAddresses[_sender]);
    require(_sender != address(0));
    

    _;
    }

    function balanceOf(address _who) view public returns (uint256)
    {
        return balances[_who];
    }

    function lockedBalanceOf(address _who) view public returns (uint256)
    {
        require(_who != address(0));

        uint256 lockedBalance = 0;
        if(lockup[_who].length > 0)
        {
            Lock[] storage locks = lockup[_who];

            uint256 length = locks.length;
            for (uint i = 0; i < length; i++)
            {
                if (now < locks[i].expiresAt)
                {
                    lockedBalance = lockedBalance.add(locks[i].amount);
                }
            }
        }

        return lockedBalance;
    }

    function allowance(address _owner, address _spender) view external returns (uint256)
    {
        return approvals[_owner][_spender];
    }

    function isLocked(address _who, uint256 _value) view public returns(bool)
    {
        uint256 lockedBalance = lockedBalanceOf(_who);
        uint256 balance = balanceOf(_who);

        if(lockedBalance <= 0)
        {
            return false;
        }
        else
        {
            return !(balance > lockedBalance && balance.sub(lockedBalance) >= _value);
        }
    }

    function transfer(address _to, uint256 _value) external onlyWhenNotStopped canTransfer(msg.sender, _value) transferParamsValidation(msg.sender, _to, _value) returns (bool)
    {
        
        _transfer(msg.sender, _to, _value);

        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) external onlyWhenNotStopped transferParamsValidation(_from, _to, _value) returns (bool)
    {
        require(approvals[_from][msg.sender] >= _value);

        approvals[_from][msg.sender] = approvals[_from][msg.sender].sub(_value);

        _transfer(_from, _to, _value);

        return true;
    }
    
    // transferWithLock is only for airdrop or marketing purpose

    function transferWithLock(address _to, uint256 _value, uint256 _time) onlyOwner transferParamsValidation(msg.sender, _to, _value) external returns (bool)
    {
        require(_time > now);

        _lock(_to, _value, _time);
        _transfer(msg.sender, _to, _value);

        return true;
    }
    
    function addtokenLock(address _to, uint256 _value, uint256 _time) onlyOwner transferParamsValidation(msg.sender, _to, _value) external returns (bool)
    {
        require(_time > now);

        _lock(_to, _value, _time);


        return true;
    }
    
    // lockAddress is only for security accident prevention
    
    function lockAddress(address _addr, bool _locked) onlyOwner external
    {
        lockedAddresses[_addr] = _locked;
    }

    // approve is for transfer authentication
    function approve(address _spender, uint256 _value) external onlyWhenNotStopped returns (bool)
    {
        require(_spender != address(0));
        require(balances[msg.sender] >= _value);
        require(msg.sender != _spender);

        approvals[msg.sender][_spender] = _value;

        emit Approval(msg.sender, _spender, _value);

        return true;
    }

    
    function unlock(address _who, uint256 _index) onlyOwner external returns (bool)
    {
        uint256 length = lockup[_who].length;
        require(length > _index);

        lockup[_who][_index] = lockup[_who][length - 1];
        lockup[_who].length--;

        emit UnlockedIndex(_who, _index);

        return true;
    }

    function unlockAll(address _who) onlyOwner external returns (bool)
    {
        require(lockup[_who].length > 0);

        delete lockup[_who];
        emit UnlockedAll(_who);

        return true;
    }
    
    // burn is for incubator fund or security accident prevention

    function burn(uint256 _value) external
    {
        require(balances[msg.sender] >= _value);
        require(_value > 0);

        balances[msg.sender] = balances[msg.sender].sub(_value);

        totalSupply = totalSupply.sub(_value);

        emit Burn(msg.sender, _value);
    }
    
    

    function _mint(address account, uint256 _value) internal 
    {
        require(account != address(0));

        totalSupply = totalSupply.add(_value);
        balances[account] = balances[account].add(_value);
        emit Transfer(address(0), account, _value);
    }

   
    function _transfer(address _from, address _to, uint256 _value) internal
    {
        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        
        
        emit Transfer(_from, _to, _value);
    }

    function _lock(address _who, uint256 _value, uint256 _dateTime) onlyOwner internal
    {
        lockup[_who].push(Lock(_value, _dateTime));

        emit Locked(_who, lockup[_who].length - 1);
    }

    // destruction is for token upgrade
    function destruction() onlyOwner public
    {
        selfdestruct(msg.sender);
    }
    
    
}
function approve(address _spender, uint256 _value) external onlyWhenNotStopped returns (bool)
    {
        require(_spender != address(0));
        require(balances[msg.sender] >= _value);
        require(msg.sender != _spender);

        approvals[msg.sender][_spender] = _value;

        emit Approval(msg.sender, _spender, _value);

        return true;
    }
// approve is for transfer authentication