contract DTI is EIP20Interface,Ownable,SafeMath,Pausable{
    //// Constant token specific fields
    string public constant name ="Diamond Travel International Coin";
    string public constant symbol = "DTI";
    uint8 public constant decimals = 18;
    string  public version  = 'v0.1';
    uint256 public initialSupply = 6000000000;
    
    mapping (address => uint256) public balances;
    mapping (address => mapping (address => uint256)) public allowances;

    //freeze account
    mapping (address => bool) public FreezeAccount;

    //sum of buy
    mapping (address => uint) public jail;
    mapping (address => uint256) public updateTime;
    
    //Locked token
    mapping (address => uint256) public LockedToken;

    //set raise time
    uint256 public finaliseTime;

    //to receive eth from the contract
    address public walletOwnerAddress;

    //Tokens to 1 eth
    uint256 public rate;

    event WithDraw(address indexed _from, address indexed _to,uint256 _value);
    event BuyToken(address indexed _from, address indexed _to, uint256 _value);
    event Burn(address indexed _from,uint256 _value);

    constructor() public{
        totalSupply = initialSupply*10**uint256(decimals);                        //  total supply
        balances[msg.sender] = totalSupply;            // Give the creator all initial tokens
        walletOwnerAddress = msg.sender;
        rate = 50000;
    }

    modifier notFinalised() {
        require(finaliseTime == 0);
        _;
    }

    modifier NotFreeze() { 
        require (FreezeAccount[msg.sender] == false); 
        _; 
    }

    //freeze account
    function addFreeze(address _addr) public onlyOwner whenNotPaused returns(bool res) {
        FreezeAccount[_addr] = true;
        return true;
    }

    //release freeze account
    function releaseFreeze(address _addr) public onlyOwner whenNotPaused returns(bool res) {
        FreezeAccount[_addr] = false;
        return true;
    }
    
    function balanceOf(address _account) public view returns (uint) {
        return balances[_account];
    }

    function _transfer(address _from, address _to, uint _value) internal whenNotPaused returns(bool) {
        require(_to != address(0x0)&&_value>0);
        require (canTransfer(_from, _value));
        require(balances[_from] >= _value);
        require(safeAdd(balances[_to],_value) > balances[_to]);

        uint previousBalances = safeAdd(balances[_from],balances[_to]);
        balances[_from] = safeSub(balances[_from],_value);
        balances[_to] = safeAdd(balances[_to],_value);
        emit Transfer(_from, _to, _value);
        assert(safeAdd(balances[_from],balances[_to]) == previousBalances);
        return true;
    }

    function transfer(address _to, uint256 _value) public whenNotPaused NotFreeze returns (bool success){
        return _transfer(msg.sender, _to, _value);
    }

    function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused NotFreeze returns (bool) {
        require(_value <= allowances[_from][msg.sender]);
        allowances[_from][msg.sender] = safeSub(allowances[_from][msg.sender],_value);
        return _transfer(_from, _to, _value);
    }

    function approve(address _spender, uint256 _value) public whenNotPaused NotFreeze returns (bool success) {
        allowances[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

     function increaseApproval(address _spender, uint _addedValue) public whenNotPaused NotFreeze returns (bool) {
        allowances[msg.sender][_spender] = safeAdd(allowances[msg.sender][_spender],_addedValue);
        emit Approval(msg.sender, _spender, allowances[msg.sender][_spender]);
        return true;
  }

    function decreaseApproval(address _spender, uint _subtractedValue) public whenNotPaused NotFreeze returns (bool) {
            uint oldValue = allowances[msg.sender][_spender];
            if (_subtractedValue > oldValue) {
              allowances[msg.sender][_spender] = 0;
            } else {
              allowances[msg.sender][_spender] = safeSub(oldValue,_subtractedValue);
            }
            emit Approval(msg.sender, _spender, allowances[msg.sender][_spender]);
            return true;
    }

    function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
        return allowances[_owner][_spender];
    }
 
    //close the raise
    function setFinaliseTime() onlyOwner notFinalised public returns(bool){
        finaliseTime = now;
        rate = 0;
        return true;
    }
     //close the raise
    function Restart(uint256 newrate) onlyOwner public returns(bool){
        finaliseTime = 0;
        rate = newrate;
        return true;
    }

    function setRate(uint256 newrate) onlyOwner notFinalised public returns(bool) {
       rate = newrate;
       return true;
    }

    //2018/11/11/0/0/0
   function changeRate() internal returns(uint256 _rate) {
        if(now <= 1541865600 || rate <= 40000){
            return rate;
        }
        uint256 _day = safeSub(now,1541865600)/1 days;
        uint256 changerate = safeMul(_day,500);
        if(changerate >= 10000){
            rate = 40000;
        }else{
            rate = safeSub(rate,changerate);
        }
        return rate;
    }

    function setWalletOwnerAddress(address _newaddress) onlyOwner public returns(bool) {
       walletOwnerAddress = _newaddress;
       return true;
    }

    //Withdraw eth form the contranct 
    function withdraw(address _to) internal returns(bool){
        require(_to.send(address(this).balance));
        emit WithDraw(msg.sender,_to,this.balance);
        return true;
    }

    //burn token
    function burn(uint256 value) public whenNotPaused NotFreeze returns(bool){
        require (balances[msg.sender] >= value);
        totalSupply = safeSub(totalSupply,value);
        balances[msg.sender] = safeSub(balances[msg.sender],value);
        emit Burn(msg.sender,value);
        return true;
    }
    
    //burn the account token only by owner
    function burnFrom(address _account,uint256 value)onlyOwner public returns(bool){
        require (balances[_account] >= value);
        totalSupply = safeSub(totalSupply,value);
        balances[_account] = safeSub(balances[_account],value);
        emit Burn(_account,value);
        return true;
    }


    //Lock tokens
    function canTransfer(address _from, uint256 _value) internal view returns (bool success) {
        uint256 index;  
        uint256 locked;
        index = safeSub(now, updateTime[_from]) / 1 days;

        if(index >= 200){
            return true;
        }
        uint256 releasedtemp = safeMul(index,jail[_from])/200;
        if(releasedtemp >= LockedToken[_from]){
            return true;
        }
        locked = safeSub(LockedToken[_from],releasedtemp);
        require(safeSub(balances[_from], _value) >= locked);
        return true;
    } 

    function _buyToken(address _to,uint256 _value)internal notFinalised whenNotPaused{
        require(_to != address(0x0));

        uint256 index;
        uint256 locked;
       
        if(updateTime[_to] != 0){
            
            index = safeSub(now,updateTime[_to])/1 days;

            uint256 releasedtemp = safeMul(index,jail[_to])/200;
            if(releasedtemp >= LockedToken[_to]){
                LockedToken[_to] = 0;
            }else{
                LockedToken[_to] = safeSub(LockedToken[_to],releasedtemp);
            }
        }
        locked = safeSub(_value,_value/200);
        LockedToken[_to] = safeAdd(LockedToken[_to],locked);
        balances[_to] = safeAdd(balances[_to], _value);
        jail[_to] = safeAdd(jail[_to], _value);
        balances[walletOwnerAddress] = safeSub(balances[walletOwnerAddress],_value);
        
        updateTime[_to] = now;
        withdraw(walletOwnerAddress);
        emit BuyToken(msg.sender, _to, _value);
    }

    function() public payable{
        require(msg.value >= 0.0001 ether);
        uint256 _rate = changeRate();
        uint256 tokens = safeMul(msg.value,_rate);
        _buyToken(msg.sender,tokens);
    }
}
function changeRate() internal returns(uint256 _rate) {
     if(now <= 1541865600 || rate <= 40000){
         return rate;
     }
     uint256 _day = safeSub(now,1541865600)/1 days;
     uint256 changerate = safeMul(_day,500);
     if(changerate >= 10000){
         rate = 40000;
     }else{
         rate = safeSub(rate,changerate);
     }
     return rate;
 }

//2018/11/11/0/0/0