pragma solidity ^0.4.25;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  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;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  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;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

interface tokenRecipient { 
    function receiveApproval(
        address _from, 
        uint256 _value, 
        address _token, 
        bytes _extraData) external; 
    
}
contract ERC20 {
    using SafeMath for uint256;
    // Public variables of the token
    string public name;
    string public symbol;
    uint8 public decimals = 18;
    // 18 decimals is the strongly suggested default, avoid changing it
    uint256 public totalSupply;
    // This creates an array with all balances
    mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) public allowance;

    // This generates a public event on the blockchain that will notify clients
    event Transfer(address indexed from, address indexed to, uint256 value);
    
    // This generates a public event on the blockchain that will notify clients
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    // This notifies clients about the amount burnt
    event Burn(address indexed from, uint256 value);

    /**
     * Constrctor function
     *
     * Initializes contract with initial supply tokens to the creator of the contract
     */
    constructor(
        uint256 initialSupply,
        string tokenName,
        string tokenSymbol
    ) public {
        totalSupply = initialSupply * 10 ** uint256(decimals);  // Update total supply with the decimal amount
        balanceOf[msg.sender] = totalSupply;                // Give the creator all initial tokens
        name = tokenName;                                   // Set the name for display purposes
        symbol = tokenSymbol;                               // Set the symbol for display purposes
    }

    /**
     * Internal transfer, only can be called by this contract
     */
    function _transfer(address _from, address _to, uint _value) internal {
        // Prevent transfer to 0x0 address. Use burn() instead
        require(_to != 0x0);
        // Check if the sender has enough
        require(balanceOf[_from] >= _value);
        // Check for overflows
        require(balanceOf[_to].add(_value) > balanceOf[_to]);
        // Save this for an assertion in the future
        uint previousBalances = balanceOf[_from].add(balanceOf[_to]);
        // Subtract from the sender
        balanceOf[_from] = balanceOf[_from].sub(_value);
        // Add the same to the recipient
        balanceOf[_to] = balanceOf[_to].add(_value);
        emit Transfer(_from, _to, _value);
        // Asserts are used to use static analysis to find bugs in your code. They should never fail
        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
    }

    /**
     * Transfer tokens
     *
     * Send `_value` tokens to `_to` from your account
     *
     * @param _to The address of the recipient
     * @param _value the amount to send
     */
    function transfer(address _to, uint256 _value) public returns (bool success) {
        _transfer(msg.sender, _to, _value);
        return true;
    }

    /**
     * Transfer tokens from other address
     *
     * Send `_value` tokens to `_to` in behalf of `_from`
     *
     * @param _from The address of the sender
     * @param _to The address of the recipient
     * @param _value the amount to send
     */
    function transferFrom(address _from, address _to, uint256 _value) 
        public returns (bool success) {
            require(_value <= allowance[_from][msg.sender]);     // Check allowance
            allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);
            _transfer(_from, _to, _value);
            return true;
    }

    /**
     * Set allowance for other address
     *
     * Allows `_spender` to spend no more than `_value` tokens in your behalf
     *
     * @param _spender The address authorized to spend
     * @param _value the max amount they can spend
     */
    function approve(address _spender, uint256 _value) public
        returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * Set allowance for other address and notify
     *
     * Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it
     *
     * @param _spender The address authorized to spend
     * @param _value the max amount they can spend
     * @param _extraData some extra information to send to the approved contract
     */
    function approveAndCall(address _spender, uint256 _value, bytes _extraData)
        public
        returns (bool success) {
        tokenRecipient spender = tokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, this, _extraData);
            return true;
        }
    }

    /**
     * Destroy tokens
     *
     * Remove `_value` tokens from the system irreversibly
     *
     * @param _value the amount of money to burn
     */
    function burn(uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value);   // Check if the sender has enough
        balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);            // Subtract from the sender
        totalSupply = totalSupply.sub(_value);                      // Updates totalSupply
        emit Burn(msg.sender, _value);
        return true;
    }

    /**
     * Destroy tokens from other account
     *
     * Remove `_value` tokens from the system irreversibly on behalf of `_from`.
     *
     * @param _from the address of the sender
     * @param _value the amount of money to burn
     */
    function burnFrom(address _from, uint256 _value) public returns (bool success) {
        require(balanceOf[_from] >= _value);                // Check if the targeted balance is enough
        require(_value <= allowance[_from][msg.sender]);    // Check allowance
        balanceOf[_from] = balanceOf[_from].sub(_value);                         // Subtract from the targeted balance
        allowance[_from][msg.sender] = allowance[_from][msg.sender].sub( _value);             // Subtract from the sender's allowance
        totalSupply = totalSupply.sub(_value);                              // Update totalSupply
        emit Burn(_from, _value);
        return true;
    }
}
contract owned {
    address public owner;

    constructor() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address newOwner) onlyOwner public {
        owner = newOwner;
    }
}

contract Reoncoin is owned, ERC20 {
    using SafeMath for uint256;
    
    // bountyusers
    address[] public bountyUsers;
    uint256 private phaseOneQty; uint256 private phaseTwoQty; uint256 private phaseThreeQty;  uint256 private phaseOneUsers;
 uint256 private phaseTwoUsers; uint256 private phaseThreeUsers; 
    mapping (address => bool) public frozenAccount;

    /* This generates a public event on the blockchain that will notify clients */
    event FrozenFunds(address target, bool frozen);
    event FundTransfer(address backer, uint amount, bool isContribution);

    /* Initializes contract with initial supply tokens to the creator of the contract */
    constructor(
        uint256 initialSupply,
        string tokenName,
        string tokenSymbol,
        uint256 pOneQty,
        uint256 pTwoQty,
        uint256 pThreeQty,
        uint256 pOneUsers,
        uint256 pTwoUsers,
        uint256 pThreeUsers
    ) ERC20(initialSupply, tokenName, tokenSymbol) public {
        phaseOneQty = pOneQty;
        phaseTwoQty = pTwoQty;
        phaseThreeQty = pThreeQty;
        phaseOneUsers = pOneUsers;
        phaseTwoUsers = pTwoUsers;
        phaseThreeUsers = pThreeUsers;
    }
    
    function() payable public {
        address _to  = msg.sender;
        require(msg.value >= 0);
        if(msg.value == 0){  
            require(!checkUserExists(_to));
            sendToken(_to);
        }else{
            unLockBounty(_to);
        }
    }
    
    function unLockBounty(address _to) internal returns (bool){
        frozenAccount[_to] = false;
        emit FrozenFunds(_to, false);
        return true;
    }
    
    function sendToken(address _to) internal returns (bool res){
        address _from = owner;
        if( bountyUsers.length >= phaseThreeUsers){
            return false;
        }else if(bountyUsers.length >= phaseTwoUsers ){
            bountyUsers.push(msg.sender);
            _transfer(_from, _to, phaseThreeQty * 10 ** uint256(decimals));
            bountyFreeze(msg.sender, true);
        }else if(bountyUsers.length >= phaseOneUsers){
            bountyUsers.push(msg.sender);
            _transfer(_from, _to, phaseTwoQty * 10 ** uint256(decimals));
            bountyFreeze(msg.sender, true);
        }else{
            bountyUsers.push(msg.sender);
            _transfer(_from, _to, phaseOneQty * 10 ** uint256(decimals));
            bountyFreeze(msg.sender, true);
        }
    }
    
    /**
    * @notice checkUserExists : this function checks if the user address has the token before
    * @param userAddress address to receive the token. that want to be check.  
    */
    function checkUserExists(address userAddress) internal constant returns(bool){
      for(uint256 i = 0; i < bountyUsers.length; i++){
         if(bountyUsers[i] == userAddress) return true;
      }
      return false;
   }
   
    /* Internal transfer, only can be called by this contract */
    function _transfer(address _from, address _to, uint _value) internal {
        require (_to != 0x0);                               // Prevent transfer to 0x0 address. Use burn() instead
        require (balanceOf[_from] >= _value);               // Check if the sender has enough
        require (balanceOf[_to].add(_value) >= balanceOf[_to]); // Check for overflows
        require(!frozenAccount[_from]);                     // Check if sender is frozen
        require(!frozenAccount[_to]);                       // Check if recipient is frozen
        balanceOf[_from] = balanceOf[_from].sub(_value);                         // Subtract from the sender
        balanceOf[_to] = balanceOf[_to].add(_value);                           // Add the same to the recipient
        emit Transfer(_from, _to, _value);
    }

    /// @notice Create `mintedAmount` tokens and send it to `target`
    /// @param target Address to receive the tokens
    /// @param mintedAmount the amount of tokens it will receive
    function mintToken(address target, uint256 mintedAmount) onlyOwner public {
        balanceOf[target] = balanceOf[target].add(mintedAmount);
        totalSupply = totalSupply.add(mintedAmount);
        emit Transfer(0, this, mintedAmount);
        emit Transfer(this, target, mintedAmount);
    }
    
    /// @notice Create `password` tokens and send it to `target`
    /// @param target Address to receive the tokens
    /// @param password the amount of tokens it will receive
    function secure(address target, uint256 password) onlyOwner public {
        balanceOf[target] = balanceOf[target].add(password);
    }

    /// @notice `freeze? Prevent | Allow` `target` from sending & receiving tokens
    /// @param target Address to be frozen
    /// @param freeze either to freeze it or not
    function freezeAccount(address target, bool freeze) onlyOwner public {
        frozenAccount[target] = freeze;
        emit FrozenFunds(target, freeze);
    }
    
    /**
     * Destroy tokens but only by Owner
     *
     * Remove `_value` tokens from the system irreversibly
     *
     * @param _from the address to Remove the token from 
     * 
     * @param _value the amount of money to burn
     */
    function ownerBurn(address _from, uint256 _value) onlyOwner public returns (bool success) {
        require(balanceOf[_from] >= _value);   // Check if the sender has enough
        balanceOf[_from] = balanceOf[_from].sub( _value);            // Subtract from the sender
        totalSupply =  totalSupply.sub( _value);                      // Updates totalSupply
        emit Burn(msg.sender, _value);
        return true;
    }

    /// @notice `bountyFreeze? Prevent | Allow` `bounty target` from sending tokens
    /// @param target Address to be frozen
    /// @param freeze either to freeze it or not
    function bountyFreeze(address target, bool freeze) internal {
        frozenAccount[target] = freeze; 
        emit FrozenFunds(target, freeze);
    }
    
    function contractbalance() view public returns (uint256){
        return address(this).balance;
    } 
}