contract DoradoToken is StandardToken, Owned {
    string public constant name = "DoradoToken";
    string public constant symbol = "DOR";
    uint8 public constant decimals = 15;

    /// Maximum tokens to be allocated on the sale (51% of the hard cap)
    uint256 public constant TOKENS_SALE_HARD_CAP = 510000000000000000000000; // 510000000 * 10**15

    /// Base exchange rate is set to 1 ETH = 6667 DOR.
    uint256 public constant BASE_RATE = 6667;

    /// seconds since 01.01.1970 to 07.02.2018 (16:00:00 o'clock UTC)
    /// HOT sale start time
    uint64 private constant dateHOTSale = 1517961600 + 16 hours;

    /// HOT sale end time; Sale A start time 21.02.2018
    uint64 private constant dateSaleA = 1519171200 + 16 hours;

    /// Sale A end time; Sale B start time 07.03.2018
    uint64 private constant dateSaleB = 1520380800 + 16 hours;

    /// Sale B end time; Sale C start time 21.03.2018
    uint64 private constant dateSaleC = 1521590400 + 16 hours;

    /// Sale C end time; Sale D start time 04.04.2018
    uint64 private constant dateSaleD = 1522800000 + 16 hours;

    /// Sale D end time; Sale E start time 18.04.2018
    uint64 private constant dateSaleE = 1524009600 + 16 hours;

    /// Sale E end time;  Sale F start time 02.05.2018
    uint64 private constant dateSaleF = 1525219200 + 16 hours;

    /// Sale F end time; 16.05.2018 
    uint64 private constant date16May2018 = 1526428800 + 16 hours;
    
    /// token caps for each round
    uint256[7] private roundCaps = [
        70000000000000000000000, // HOT sale  70000000 * 10**15 
        140000000000000000000000, // Sale A   140000000 * 10**15
        210000000000000000000000, // Sale B   210000000 * 10**15
        285000000000000000000000, // Sale C   285000000 * 10**15
        360000000000000000000000, // Sale D   360000000 * 10**15
        435000000000000000000000, // Sale E   435000000 * 10**15
        510000000000000000000000  // Sale F   510000000 * 10**15
    ];
    uint8[7] private roundDiscountPercentages = [33, 30, 27, 22, 17, 12, 7];

    
    /// team tokens are locked until this date (01.01.2021) 00:00:00
    uint64 private constant dateTeamTokensLockedTill = 1609459200;
   

    /// no tokens can be ever issued when this is set to "true"
    bool public tokenSaleClosed = false;

    /// contract to be called to release the Dorado team tokens
    address public timelockContractAddress;

    modifier inProgress {
        require(totalSupply < TOKENS_SALE_HARD_CAP
            && !tokenSaleClosed && now >= dateHOTSale);
        _;
    }

    /// Allow the closing to happen only once
    modifier beforeEnd {
        require(!tokenSaleClosed);
        _;
    }

    /// Require that the token sale has been closed
    modifier tradingOpen {
        require(tokenSaleClosed);
        _;
    }

    function DoradoToken() public {
    }

    /// @dev This default function allows token to be purchased by directly
    /// sending ether to this smart contract.
    function () public payable {
        purchaseTokens(msg.sender);
    }

    /// @dev Issue token based on Ether received.
    /// @param _beneficiary Address that newly issued token will be sent to.
    function purchaseTokens(address _beneficiary) public payable inProgress {
        // only accept a minimum amount of ETH?
        require(msg.value >= 0.01 ether);

        uint256 tokens = computeTokenAmount(msg.value);
        
        // roll back if hard cap reached
        require(totalSupply.add(tokens) <= TOKENS_SALE_HARD_CAP);
        
        doIssueTokens(_beneficiary, tokens);

        /// forward the raised funds to the contract creator
        owner.transfer(this.balance);
    }

    /// @dev Batch issue tokens on the presale
    /// @param _addresses addresses that the presale tokens will be sent to.
    /// @param _addresses the amounts of tokens, with decimals expanded (full).
    function issueTokensMulti(address[] _addresses, uint256[] _tokens) public onlyOwner beforeEnd {
        require(_addresses.length == _tokens.length);
        require(_addresses.length <= 100);

        for (uint256 i = 0; i < _tokens.length; i = i.add(1)) {
            doIssueTokens(_addresses[i], _tokens[i]);
        }
    }

    /// @dev Issue tokens for a single buyer on the presale
    /// @param _beneficiary addresses that the presale tokens will be sent to.
    /// @param _tokens the amount of tokens, with decimals expanded (full).
    function issueTokens(address _beneficiary, uint256 _tokens) public onlyOwner beforeEnd {
        doIssueTokens(_beneficiary, _tokens);
    }

    /// @dev issue tokens for a single buyer
    /// @param _beneficiary addresses that the tokens will be sent to.
    /// @param _tokens the amount of tokens, with decimals expanded (full).
    function doIssueTokens(address _beneficiary, uint256 _tokens) internal {
        require(_beneficiary != address(0));

        // increase token total supply
        totalSupply = totalSupply.add(_tokens);
        // update the beneficiary balance to number of tokens sent
        balances[_beneficiary] = balances[_beneficiary].add(_tokens);

        // event is fired when tokens issued
        Transfer(address(0), _beneficiary, _tokens);
    }

    /// @dev Returns the current price.
    function price() public view returns (uint256 tokens) {
        return computeTokenAmount(1 ether);
    }

    /// @dev Compute the amount of DOR token that can be purchased.
    /// @param ethAmount Amount of Ether in WEI to purchase DOR.
    /// @return Amount of DOR token to purchase
    function computeTokenAmount(uint256 ethAmount) internal view returns (uint256 tokens) {
        uint256 tokenBase = (ethAmount.mul(BASE_RATE)/10000000000000)*10000000000;//18 decimals to 15 decimals, set precision to 5 decimals
        uint8 roundNum = currentRoundIndex();
        tokens = tokenBase.mul(100)/(100 - (roundDiscountPercentages[roundNum]));
        while(tokens.add(totalSupply) > roundCaps[roundNum] && roundNum < 6){
           roundNum++;
           tokens = tokenBase.mul(100)/(100 - (roundDiscountPercentages[roundNum])); 
        }
    }

    /// @dev Determine the current sale round
    /// @return integer representing the index of the current sale round
    function currentRoundIndex() internal view returns (uint8 roundNum) {
        roundNum = currentRoundIndexByDate();

        /// round determined by conjunction of both time and total sold tokens
        while(roundNum < 6 && totalSupply > roundCaps[roundNum]) {
            roundNum++;
        }
    }

    /// @dev Determine the current sale tier.
    /// @return the index of the current sale tier by date.
    function currentRoundIndexByDate() internal view returns (uint8 roundNum) {
        require(now <= date16May2018); 
        if(now > dateSaleF) return 6;
        if(now > dateSaleE) return 5;
        if(now > dateSaleD) return 4;
        if(now > dateSaleC) return 3;
        if(now > dateSaleB) return 2;
        if(now > dateSaleA) return 1;
        else return 0;
    }

    /// @dev Closes the sale, issues the team tokens and burns the unsold
    function close() public onlyOwner beforeEnd {
        /// team tokens are equal to 15% of the sold tokens
        /// 8% foodout group tokens are added to the locked tokens
        uint256 lockedTokens = 230000000000000000000000;
        //partner tokens are available from the beginning
        uint256 partnerTokens = 260000000000000000000000;
        
        issueLockedTokens(lockedTokens);
        issuePartnerTokens(partnerTokens);
        
        /// increase token total supply
        totalSupply = totalSupply.add(lockedTokens+partnerTokens);
        
        /// burn the unallocated tokens - no more tokens can be issued after this line
        tokenSaleClosed = true;

        /// forward the raised funds to the contract creator
        owner.transfer(this.balance);
    }
    
    /**
     * issue the tokens for the team and the foodout group.
     * tokens are locked for 3 years.
     * @param lockedTokens the amount of tokens to the issued and locked
     * */
    function issueLockedTokens( uint lockedTokens) internal{
        /// team tokens are locked until this date (01.01.2021)
        TokenTimelock lockedTeamTokens = new TokenTimelock(this, owner, dateTeamTokensLockedTill);
        timelockContractAddress = address(lockedTeamTokens);
        balances[timelockContractAddress] = balances[timelockContractAddress].add(lockedTokens);
        /// fire event when tokens issued
        Transfer(address(0), timelockContractAddress, lockedTokens);
        
    }
    
    /**
     * issue the tokens for partners and advisors
     * @param partnerTokens the amount of tokens to be issued
     * */
    function issuePartnerTokens(uint partnerTokens) internal{
        balances[owner] = partnerTokens;
        Transfer(address(0), owner, partnerTokens);
    }

    /// Transfer limited by the tradingOpen modifier
    function transferFrom(address _from, address _to, uint256 _value) public tradingOpen returns (bool) {
        return super.transferFrom(_from, _to, _value);
    }

    /// Transfer limited by the tradingOpen modifier
    function transfer(address _to, uint256 _value) public tradingOpen returns (bool) {
        return super.transfer(_to, _value);
    }
}
function issueTokensMulti(address[] _addresses, uint256[] _tokens) public onlyOwner beforeEnd {
    require(_addresses.length == _tokens.length);
    require(_addresses.length <= 100);

    for (uint256 i = 0; i < _tokens.length; i = i.add(1)) {
        doIssueTokens(_addresses[i], _tokens[i]);
    }
}

/// @dev Batch issue tokens on the presale
/// @param _addresses addresses that the presale tokens will be sent to.
/// @param _addresses the amounts of tokens, with decimals expanded (full).