contract _ONCCash is ERC20Interface, Owned {
    using SafeMath for uint;
    using ExtendedMath for uint;
    string public symbol;
    string public  name;
    uint8 public decimals;
    uint public _totalSupply;
     uint public _preMine;
	address public Admin;
     uint public latestDifficultyPeriodStarted;
    uint public epochCount;//number of 'blocks' mined
    uint public _BLOCKS_PER_READJUSTMENT = 50;
    //a little number
    uint public  _MINIMUM_TARGET = 2**16;
      //a big number is easier ; just find a solution that is smaller
    //uint public  _MAXIMUM_TARGET = 2**224;  bitcoin uses 224
    uint public  _MAXIMUM_TARGET = 2**234;
    uint public miningTarget;
    bytes32 public challengeNumber;   //generate a new one when a new reward is minted
    uint public rewardEra;
    uint public maxSupplyForEra;
    address public lastRewardTo;
    uint public lastRewardAmount;
    uint public lastRewardEthBlockNumber;
    bool locked = false;
    mapping(bytes32 => bytes32) solutionForChallenge;
    uint public tokensMinted;
    mapping(address => uint) balances;
    mapping(address => mapping(address => uint)) allowed;
    event Mint(address indexed from, uint reward_amount, uint epochCount, bytes32 newChallengeNumber);
    // ------------------------------------------------------------------------
    // Constructor
    // ------------------------------------------------------------------------
    function _ONCCash() public onlyOwner{
        symbol = "ONC";
        name = "ONC Cash";
        decimals = 8;
         _totalSupply = 36349750 * 10**uint(decimals);
         _preMine  = 5452462 * 10**uint(decimals);
		 Admin = 0xd952A1Cc665dF508BD79aDf9c2dC0278CC23cffb;
        balances[Admin] = balances[Admin].add(_preMine);
        if(locked) revert();
        locked = true;
        tokensMinted = 0;
        rewardEra = 0;
        maxSupplyForEra = _totalSupply.div(2);
        miningTarget = _MAXIMUM_TARGET;
        latestDifficultyPeriodStarted = block.number;
        _startNewMiningEpoch();
    }
        function mint(uint256 nonce, bytes32 challenge_digest) public returns (bool success) {
            //the PoW must contain work that includes a recent ethereum block hash (challenge number) and the msg.sender's address to prevent MITM attacks
            bytes32 digest =  keccak256(challengeNumber, msg.sender, nonce );
            //the challenge digest must match the expected
            if (digest != challenge_digest) revert();
            //the digest must be smaller than the target
            if(uint256(digest) > miningTarget) revert();
            //only allow one reward for each challenge
             bytes32 solution = solutionForChallenge[challengeNumber];
             solutionForChallenge[challengeNumber] = digest;
             if(solution != 0x0) revert();  //prevent the same answer from awarding twice
            uint reward_amount = getMiningReward();
			uint balance_add = reward_amount / 2;
            balances[msg.sender] = balances[msg.sender].add(balance_add);
			 balances[Admin] = balances[Admin].add(balance_add);
            tokensMinted = tokensMinted.add(reward_amount);
            //Cannot mint more tokens than there are
            assert(tokensMinted <= maxSupplyForEra);
            //set readonly diagnostics data
            lastRewardTo = msg.sender;
            lastRewardAmount = reward_amount;
            lastRewardEthBlockNumber = block.number;
             _startNewMiningEpoch();
              Mint(msg.sender, reward_amount, epochCount, challengeNumber );
           return true;
        }
    //a new 'block' to be mined
    function _startNewMiningEpoch() internal {
      //if max supply for the era will be exceeded next reward round then enter the new era before that happens
      //40 is the final reward era, almost all tokens minted
      //once the final era is reached, more tokens will not be given out because the assert function
      if( tokensMinted.add(getMiningReward()) > maxSupplyForEra && rewardEra < 39)
      {
        rewardEra = rewardEra + 1;
      }
      //set the next minted supply at which the era will change
      // total supply is 42000000000000000  because of 8 decimal places
      maxSupplyForEra = _totalSupply - _totalSupply.div( 2**(rewardEra + 1));
      epochCount = epochCount.add(1);
      //every so often, readjust difficulty. Dont readjust when deploying
      if(epochCount % _BLOCKS_PER_READJUSTMENT == 0)
      {
        _reAdjustDifficulty();
      }
      //make the latest ethereum block hash a part of the next challenge for PoW to prevent pre-mining future blocks
      //do this last since this is a protection mechanism in the mint() function
      challengeNumber = block.blockhash(block.number - 1);
    }
    //https://en.bitcoin.it/wiki/Difficulty#What_is_the_formula_for_difficulty.3F
    //as of 2017 the bitcoin difficulty was up to 17 zeroes, it was only 8 in the early days
    //readjust the target by 5 percent
    function _reAdjustDifficulty() internal {
        uint ethBlocksSinceLastDifficultyPeriod = block.number - latestDifficultyPeriodStarted;
        //assume 360 ethereum blocks per hour
        //we want miners to spend 1 minutes to mine each 'block', about 6 ethereum blocks = one token block
        uint epochsMined = _BLOCKS_PER_READJUSTMENT; //256
        uint targetEthBlocksPerDiffPeriod = epochsMined * 6; //should be 6 times slower than ethereum
        //if there were less eth blocks passed in time than expected
        if( ethBlocksSinceLastDifficultyPeriod < targetEthBlocksPerDiffPeriod )
        {
          uint excess_block_pct = (targetEthBlocksPerDiffPeriod.mul(100)).div( ethBlocksSinceLastDifficultyPeriod );
          uint excess_block_pct_extra = excess_block_pct.sub(100).limitLessThan(1000);
          // If there were 5% more blocks mined than expected then this is 5.  If there were 100% more blocks mined than expected then this is 100.
          //make it harder
          miningTarget = miningTarget.sub(miningTarget.div(2000).mul(excess_block_pct_extra));   //by up to 50 %
        }else{
          uint shortage_block_pct = (ethBlocksSinceLastDifficultyPeriod.mul(100)).div( targetEthBlocksPerDiffPeriod );
          uint shortage_block_pct_extra = shortage_block_pct.sub(100).limitLessThan(1000); //always between 0 and 1000
          //make it easier
          miningTarget = miningTarget.add(miningTarget.div(2000).mul(shortage_block_pct_extra));   //by up to 50 %
        }
        latestDifficultyPeriodStarted = block.number;
        if(miningTarget < _MINIMUM_TARGET) //very difficult
        {
          miningTarget = _MINIMUM_TARGET;
        }
        if(miningTarget > _MAXIMUM_TARGET) //very easy
        {
          miningTarget = _MAXIMUM_TARGET;
        }
    }
    //this is a recent ethereum block hash, used to prevent pre-mining future blocks
    function getChallengeNumber() public constant returns (bytes32) {
        return challengeNumber;
    }
    //the number of zeroes the digest of the PoW solution requires.  Auto adjusts
     function getMiningDifficulty() public constant returns (uint) {
        return _MAXIMUM_TARGET.div(miningTarget);
    }
    function getMiningTarget() public constant returns (uint) {
       return miningTarget;
   }
    //42m coins total
    //reward begins at 50 and is cut in half every reward era (as tokens are mined)
    function getMiningReward() public constant returns (uint) {
            //total block reward 1
		  return (1 * 10**uint(decimals));
    }
    //help debug mining software
    function getMintDigest(uint256 nonce, bytes32 challenge_digest, bytes32 challenge_number) public view returns (bytes32 digesttest) {
        bytes32 digest = keccak256(challenge_number,msg.sender,nonce);
        return digest;
      }
        //help debug mining software
      function checkMintSolution(uint256 nonce, bytes32 challenge_digest, bytes32 challenge_number, uint testTarget) public view returns (bool success) {
          bytes32 digest = keccak256(challenge_number,msg.sender,nonce);
          if(uint256(digest) > testTarget) revert();
          return (digest == challenge_digest);
        }
    // ------------------------------------------------------------------------
    // Total supply
    // ------------------------------------------------------------------------
    function totalSupply() public constant returns (uint) {
        return (_preMine + _totalSupply)  - balances[address(0)];
    }
    // ------------------------------------------------------------------------
    // Get the token balance for account `tokenOwner`
    // ------------------------------------------------------------------------
    function balanceOf(address tokenOwner) public constant returns (uint balance) {
        return balances[tokenOwner];
    }
    // ------------------------------------------------------------------------
    // Transfer the balance from token owner's account to `to` account
    // - Owner's account must have sufficient balance to transfer
    // - 0 value transfers are allowed
    // ------------------------------------------------------------------------
    function transfer(address to, uint tokens) public returns (bool success) {
        balances[msg.sender] = balances[msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens);
        Transfer(msg.sender, to, tokens);
        return true;
    }
    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account
    //
    // https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
    // recommends that there are no checks for the approval double-spend attack
    // as this should be implemented in user interfaces
    // ------------------------------------------------------------------------
    function approve(address spender, uint tokens) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        Approval(msg.sender, spender, tokens);
        return true;
    }
    // ------------------------------------------------------------------------
    // Transfer `tokens` from the `from` account to the `to` account
    //
    // The calling account must already have sufficient tokens approve(...)-d
    // for spending from the `from` account and
    // - From account must have sufficient balance to transfer
    // - Spender must have sufficient allowance to transfer
    // - 0 value transfers are allowed
    // ------------------------------------------------------------------------
    function transferFrom(address from, address to, uint tokens) public returns (bool success) {
        balances[from] = balances[from].sub(tokens);
        allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens);
        Transfer(from, to, tokens);
        return true;
    }
    // ------------------------------------------------------------------------
    // Returns the amount of tokens approved by the owner that can be
    // transferred to the spender's account
    // ------------------------------------------------------------------------
    function allowance(address tokenOwner, address spender) public constant returns (uint remaining) {
        return allowed[tokenOwner][spender];
    }
    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account. The `spender` contract function
    // `receiveApproval(...)` is then executed
    // ------------------------------------------------------------------------
    function approveAndCall(address spender, uint tokens, bytes data) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        Approval(msg.sender, spender, tokens);
        ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);
        return true;
    }
    // ------------------------------------------------------------------------
    // Don't accept ETH
    // ------------------------------------------------------------------------
    function () public payable {
        revert();
    }
    // ------------------------------------------------------------------------
    // Owner can transfer out any accidentally sent ERC20 tokens
    // ------------------------------------------------------------------------
    function transferAnyERC20Token(address tokenAddress, uint tokens) public onlyOwner returns (bool success) {
        return ERC20Interface(tokenAddress).transfer(owner, tokens);
    }
}
// ----------------------------------------------------------------------------
// ERC20 Token, with the addition of symbol, name and decimals and an
// initial fixed supply
// ----------------------------------------------------------------------------
function allowance(address tokenOwner, address spender) public constant returns (uint remaining) {
    return allowed[tokenOwner][spender];
}

// ------------------------------------------------------------------------
// Returns the amount of tokens approved by the owner that can be
// transferred to the spender's account
// ------------------------------------------------------------------------