pragma solidity ^0.4.18;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(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) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  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 Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  /**
  * @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) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _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 balance) {
    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.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev 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(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @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;
    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];
  }

  /**
   * 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
   */
  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

/**
 * @title SimpleToken
 * @dev Very simple ERC20 Token example, where all tokens are pre-assigned to the creator.
 * Note they can later distribute these tokens as they wish using `transfer` and other
 * `StandardToken` functions.
 */
contract OpportyToken is StandardToken {

  string public constant name = "OpportyToken";
  string public constant symbol = "OPP";
  uint8 public constant decimals = 18;

  uint256 public constant INITIAL_SUPPLY = 1000000000 * (10 ** uint256(decimals));

  /**
   * @dev Contructor that gives msg.sender all of existing tokens.
   */
  function OpportyToken() public {
    totalSupply = INITIAL_SUPPLY;
    balances[msg.sender] = INITIAL_SUPPLY;
  }

}

/**
 * @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 OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() 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));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

contract HoldSaleContract is Ownable {
  using SafeMath for uint256;
  // Addresses and contracts
  OpportyToken public OppToken;

  struct Holder {
    bool isActive;
    uint tokens;
    uint holdPeriodTimestamp;
    bool withdrawed;
  }

  mapping(address => Holder) public holderList;
  mapping(uint => address) private holderIndexes;

  mapping (uint => address) private assetOwners;
  mapping (address => uint) private assetOwnersIndex;
  uint private assetOwnersIndexes;

  uint private holderIndex;
  uint private holderWithdrawIndex;

  uint private tokenAddHold;
  uint private tokenWithdrawHold;

  event TokensTransfered(address contributor , uint amount);
  event Hold(address sender, address contributor, uint amount, uint holdPeriod);

  modifier onlyAssetsOwners() {
    require(assetOwnersIndex[msg.sender] > 0);
    _;
  }

  /* constructor */
  function HoldSaleContract(address _OppToken) public {
    OppToken = OpportyToken(_OppToken);
    addAssetsOwner(msg.sender);
  }

  function addHolder(address holder, uint tokens, uint timest) onlyAssetsOwners external {
    if (holderList[holder].isActive == false) {
      holderList[holder].isActive = true;
      holderList[holder].tokens = tokens;
      holderList[holder].holdPeriodTimestamp = timest;
      holderIndexes[holderIndex] = holder;
      holderIndex++;
    } else {
      holderList[holder].tokens += tokens;
      holderList[holder].holdPeriodTimestamp = timest;
    }
    tokenAddHold += tokens;
    Hold(msg.sender, holder, tokens, timest);
  }

  function getBalance() public constant returns (uint) {
    return OppToken.balanceOf(this);
  }

  function unlockTokens() external {
    address contributor = msg.sender;

    if (holderList[contributor].isActive && !holderList[contributor].withdrawed) {
      if (now >= holderList[contributor].holdPeriodTimestamp) {
        if ( OppToken.transfer( msg.sender, holderList[contributor].tokens ) ) {
          TokensTransfered(contributor,  holderList[contributor].tokens);
          tokenWithdrawHold += holderList[contributor].tokens;
          holderList[contributor].withdrawed = true;
          holderWithdrawIndex++;
        }
      } else {
        revert();
      }
    } else {
      revert();
    }
  }

  function addAssetsOwner(address _owner) public onlyOwner {
    assetOwnersIndexes++;
    assetOwners[assetOwnersIndexes] = _owner;
    assetOwnersIndex[_owner] = assetOwnersIndexes;
  }
  function removeAssetsOwner(address _owner) public onlyOwner {
    uint index = assetOwnersIndex[_owner];
    delete assetOwnersIndex[_owner];
    delete assetOwners[index];
    assetOwnersIndexes--;
  }
  function getAssetsOwners(uint _index) onlyOwner public constant returns (address) {
    return assetOwners[_index];
  }

  function getOverTokens() public onlyOwner {
    require(getBalance() > (tokenAddHold - tokenWithdrawHold));
    uint balance = getBalance() - (tokenAddHold - tokenWithdrawHold);
    if(balance > 0) {
      if(OppToken.transfer(msg.sender, balance)) {
        TokensTransfered(msg.sender,  balance);
      }
    }
  }

  function getTokenAddHold() onlyOwner public constant returns (uint) {
    return tokenAddHold;
  }
  function getTokenWithdrawHold() onlyOwner public constant returns (uint) {
    return tokenWithdrawHold;
  }
  function getHolderIndex() onlyOwner public constant returns (uint) {
    return holderIndex;
  }
  function getHolderWithdrawIndex() onlyOwner public constant returns (uint) {
    return holderWithdrawIndex;
  }
}