pragma solidity ^0.4.24;

library SafeMath {

  /**
  * @dev Multiplies two numbers, reverts on overflow.
  */
  function mul(uint256 _a, uint256 _b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (_a == 0) {
      return 0;
    }

    uint256 c = _a * _b;
    require(c / _a == _b);

    return c;
  }

  /**
  * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
  */
  function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
    require(_b > 0); // Solidity only automatically asserts 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;
  }

  /**
  * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
    require(_b <= _a);
    uint256 c = _a - _b;

    return c;
  }

  /**
  * @dev Adds two numbers, reverts on overflow.
  */
  function add(uint256 _a, uint256 _b) internal pure returns (uint256) {
    uint256 c = _a + _b;
    require(c >= _a);

    return c;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}

contract Ownable {
  address public owner;


  event OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() 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 relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  /**
   * @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 {
    _transferOwnership(_newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}

contract ERC20 {
  function totalSupply() public view returns (uint256);

  function balanceOf(address _who) public view returns (uint256);

  function allowance(address _owner, address _spender)
    public view returns (uint256);

  function transfer(address _to, uint256 _value) public returns (bool);

  function approve(address _spender, uint256 _value)
    public returns (bool);

  function transferFrom(address _from, address _to, uint256 _value)
    public returns (bool);

  event Transfer(
    address indexed from,
    address indexed to,
    uint256 value
  );

  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

contract Rays is ERC20, Ownable {
  using SafeMath for uint256;

  mapping (address => uint256) internal balances;

  mapping (address => mapping (address => uint256)) private allowed;

  uint256 internal totalSupply_;
  
  
  event Burn(address indexed burner, uint256 value);
  
  string public name = "Rays Network";
  string public symbol = "RAYS";
  uint8 public decimals = 18;
  uint256 public constant INITIAL_SUPPLY = 500000000 * 10**18;

  constructor() public {
    totalSupply_ = INITIAL_SUPPLY;
    balances[msg.sender] = INITIAL_SUPPLY;
    emit Transfer(0x0, msg.sender, INITIAL_SUPPLY);
  }

  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }
  

  /**
  * @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) {
    return balances[_owner];
  }

  /**
   * @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];
  }

  /**
  * @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(_value <= balances[msg.sender]);
    require(_to != address(0));

    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit Transfer(msg.sender, _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;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @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(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);
    require(_to != address(0));

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    emit Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a 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
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(
    address _spender,
    uint256 _addedValue
  )
    public
    returns (bool)
  {
    allowed[msg.sender][_spender] = (
      allowed[msg.sender][_spender].add(_addedValue));
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseApproval(
    address _spender,
    uint256 _subtractedValue
  )
    public
    returns (bool)
  {
    uint256 oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue >= oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Internal function that mints an amount of the token and assigns it to
   * an account. This encapsulates the modification of balances such that the
   * proper events are emitted.
   * @param _account The account that will receive the created tokens.
   * @param _amount The amount that will be created.
   */
  function _mint(address _account, uint256 _amount) public onlyOwner {
    require(_account != 0);
    totalSupply_ = totalSupply_.add(_amount);
    balances[_account] = balances[_account].add(_amount);
    emit Transfer(address(0), _account, _amount);
  }

  /**
   * @dev Internal function that burns an amount of the token of a given
   * account.
   * @param _account The account whose tokens will be burnt.
   * @param _amount The amount that will be burnt.
   */
  function _burn(address _account, uint256 _amount) public onlyOwner {
    require(_account != 0);
    require(_amount <= balances[_account]);

    totalSupply_ = totalSupply_.sub(_amount);
    balances[_account] = balances[_account].sub(_amount);
    emit Transfer(_account, address(0), _amount);
  }
  
}

contract Crowdsale is Rays {
    // ICO rounds
    enum IcoStages {preSale, preIco, ico} 
    IcoStages Stage;
    bool private crowdsaleFinished;
    
    uint private startPreSaleDate;
    uint private endPreSaleDate;
    uint public preSaleGoal;
    uint private preSaleRaised;
    
    uint private startPreIcoDate;
    uint private endPreIcoDate;
    uint public preIcoGoal;
    uint private preIcoRaised;
    
    uint private startIcoDate;
    uint private endIcoDate;
    uint public icoGoal;
    uint private icoRaised;
    
    uint private softCup; // 2 000 000 $ (300$ = 1 ether)
    uint private totalCup;
    uint private price;
    uint private total;
    uint private reserved;
    uint private hardCup;// 20 000 000 $ (300$ = 1 ether)
    
    struct Benefeciary{ // collect all participants of ICO
        address wallet;
        uint amount;
    }
    Benefeciary[] private benefeciary;
    uint private ethersRefund;
    
    constructor() public {
        startPreSaleDate = 1534723200; // insert here your pre sale start date
        endPreSaleDate = 1536969600; // insert here your pre sale end date
        preSaleGoal = 60000000; // pre-sale goal 
        preSaleRaised = 0; // raised on pre-sale stage
        startPreIcoDate = 1534723200; // insert here your pre ico start date
        endPreIcoDate = 1538265600; // insert here your pre ico end date
        preIcoGoal = 60000000; // pre ico goal 
        preIcoRaised = 0; // raised on pre ico
        startIcoDate = 1534723200; // insert here your ico start date
        endIcoDate = 1546214400; // insert here your ico end date
        icoGoal = 80000000; // ico goal 
        icoRaised = 0; // raised on ico stage
        softCup = 6670 * 10**18; 
        hardCup = 66670 * 10**18;
        totalCup = 0;
        price = 1160;
        total = preSaleGoal + preIcoGoal + icoGoal;
        reserved = (70000000 + 200000000 + 5000000 + 25000000) * 10**18;
        crowdsaleFinished = false;
    }
  
    function getCrowdsaleInfo() private returns(uint stage, 
                                               uint tokenAvailable, 
                                               uint bonus){
        // Token calculating
        if(now <= endPreSaleDate && preSaleRaised < preSaleGoal){
            Stage = IcoStages.preSale;
            tokenAvailable = preSaleGoal - preSaleRaised;
            total -= preSaleRaised;
            bonus = 0; // insert your bonus value on pre sale phase
        } else if(startPreIcoDate <= now && now <= endPreIcoDate && preIcoRaised < preIcoGoal){
            Stage = IcoStages.preIco;
            tokenAvailable = preIcoGoal - preIcoRaised;
            total -= preIcoRaised;
            bonus = 50; // + 50% seems like bonus
        } else if(startIcoDate <= now && now <= endIcoDate && icoRaised < total){
            tokenAvailable = total - icoRaised;
            Stage = IcoStages.ico;
            bonus = 0;
        } else {
            // if ICO has not been started
            revert();
        }
        return (uint(Stage), tokenAvailable, bonus);
    }
    //per 0.1 ether will recieved 116 tokens
    function evaluateTokens(uint _value, address _sender) private returns(uint tokens){
        ethersRefund = 0;
        uint bonus;
        uint tokenAvailable;
        uint stage;
        (stage,tokenAvailable,bonus) = getCrowdsaleInfo();
        tokens = _value * price / 10**18; 
        if(bonus != 0){
            tokens = tokens + (tokens * bonus / 100); // calculate bonus tokens
        } 
        if(tokenAvailable < tokens){ // if not enough tokens in reserve
            tokens = tokenAvailable;
            ethersRefund = _value - (tokens / price * 10**18); // calculate how many ethers will respond to user
            _sender.transfer(ethersRefund);// payback 
        }
        owner.transfer(_value - ethersRefund);
        // Add token value to raised variable
        if(stage == 0){
            preSaleRaised += tokens;
        } else if(stage == 1){
            preIcoRaised += tokens;
        } else if(stage == 2){
            icoRaised += tokens;
        } 
        addInvestor(_sender, _value);
        return tokens;
    }
    
    function addInvestor(address _sender, uint _value) private {
        Benefeciary memory ben;
        for(uint i = 0; i < benefeciary.length; i++){
            if(benefeciary[i].wallet == _sender){
                benefeciary[i].amount = benefeciary[i].amount + _value - ethersRefund;
            }
        }
        ben.wallet = msg.sender;
        ben.amount = msg.value - ethersRefund;
        benefeciary.push(ben);
    }
    
    
    function() public payable {
        require(startPreSaleDate <= now && now <= endIcoDate);
        require(msg.value >= 0.1 ether);
        require(!crowdsaleFinished);
        totalCup += msg.value;
        uint token = evaluateTokens(msg.value, msg.sender);
        // send tokens to buyer
        balances[msg.sender] = balances[msg.sender].add(token * 10**18);
        balances[owner] = balances[owner].sub(token * 10**18);
        emit Transfer(owner, msg.sender, token * 10**18);
    }
    
    function showParticipantWei(address _wallet) public view onlyOwner returns(uint){
        for(uint i = 0; i < benefeciary.length; i++){
            if(benefeciary[i].wallet == _wallet){
                return benefeciary[i].amount;// show in wei
            }
        }
        return 0;
    }
    
    function burnUnsoldTokens() public onlyOwner icoHasFinished{
        _burn(owner, balanceOf(owner).sub(reserved));
    }
    
    function crowdSaleStage() public view returns(string){
        string memory result;
        if(uint(Stage) == 0){
            result = "Pre Sale";
        } else if(uint(Stage) == 1){
            result = "Pre-ICO";
        } else if(uint(Stage) == 2){
            result = "ICO";
        }
        return result;
    }
    
    function preSaleRaise() public view returns(uint){
        return preSaleRaised;
    }
    
    function preIcoRaise() public view returns(uint){
        return preIcoRaised;
    }
    
    function icoRaise() public view returns(uint){
        return icoRaised;
    }
    
    modifier icoHasFinished() {
        require(now >= endIcoDate || icoRaised == total || crowdsaleFinished);
        _;
    }
    
    function endIcoByCup() public onlyOwner{
        require(!crowdsaleFinished);
        require(totalCup >= softCup && totalCup <= hardCup);
        crowdsaleFinished = true;
    }
    
    // Output all funds in wei
    function showAllFunds() public onlyOwner view returns(uint){
        return totalCup;
    }
}