// solium-disable linebreak-style
pragma solidity ^0.4.23;

contract Pedro_ERC20Token {
    string public name = "Pedro Token";
    string public symbol = "PEDRO";
    uint public decimals = 2;
    uint public INITIAL_SUPPLY = 255000000 * 10**uint(decimals);
    uint256 public totalSupply_;

    using SafeMath for uint256;

    /**
    * @dev The Ownable constructor sets the original `owner` of the contract to the sender
    * account.
    */
    constructor() 
    public 
    {
        owner = msg.sender;
        totalSupply_ = INITIAL_SUPPLY;
        balances[owner] = INITIAL_SUPPLY;
    }

    mapping(address => uint256) balances;

    /**
    * @dev We use a single lock for the whole contract.
    */
    bool private reentrancyLock = false;

    /**
    * @dev Prevents a contract from calling itself, directly or indirectly.
    * @notice If you mark a function `nonReentrant`, you should also
    * mark it `external`. Calling one nonReentrant function from
    * another is not supported. Instead, you can implement a
    * `private` function doing the actual work, and a `external`
    * wrapper marked as `nonReentrant`.
    */
    modifier nonReentrant() 
    {
        require(!reentrancyLock);
        reentrancyLock = true;
        _;
        reentrancyLock = false;
    }

    /**
    * @dev Total number of tokens in existence
    */
    function totalSupply() 
    public 
    view 
    returns (uint256) 
    {
        return totalSupply_;
    }

    /**
    * @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) 
    {
        _transfer(_to, _value);
    }
    
    function _transfer(
        address _to, 
        uint256 _value
    ) 
    internal
    nonReentrant
    returns (bool) 
    {
        require(_to != address(0));
        require(_value <= balances[msg.sender]);

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        emit Transfer(msg.sender, msg.sender, _to, _value);
        return true;
    }
    
    event Transfer(
        address indexed _from, 
        address indexed _to, 
        uint256 value
    );
    event Transfer(
        address indexed _spender,
        address indexed _from,
        address indexed _to,
        uint256 _value
    );

    /**
    * @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];
    }

    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)
    {
        _transferFrom(_from,_to,_value);
    }

    function _transferFrom(
        address _from,
        address _to,
        uint256 _value
    )
    public
    nonReentrant
    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);
        emit Transfer(_from, _to, _value);
        emit Transfer(msg.sender,_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 _currentValue,
        uint256 _value
    ) 
    public 
    returns(bool) 
    {
        require(_currentValue == allowed[msg.sender][_spender]);
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        emit Approval(msg.sender, _spender, _currentValue, _value);
        return true;
    }

    event Approval(
        address indexed _owner,
        address indexed _spender,
        uint256 value
    );
    event Approval(
        address indexed _owner,
        address indexed _spender,
        uint256 _oldValue,
        uint256 _value
    );

    /**
    * @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 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;
    }

    address public owner;

    event OwnershipRenounced(
        address indexed previousOwner
    );
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
    * @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;
    }

    event Mint(address indexed to, uint256 amount);
    event MintFinished();

    bool public mintingFinished = false;


    modifier canMint() 
    {
        require(!mintingFinished);
        _;
    }

    modifier hasMintPermission() 
    {
        require(msg.sender == owner);
        _;
    }

    /**
    * @dev Function to mint tokens
    * @param _to The address that will receive the minted tokens.
    * @param _amount The amount of tokens to mint.
    * @return A boolean that indicates if the operation was successful.
    */
    function mint(
        address _to,
        uint256 _amount
    )
    public
    hasMintPermission canMint
    returns (bool)
    {
        totalSupply_ = totalSupply_.add(_amount);
        balances[_to] = balances[_to].add(_amount);
        emit Mint(_to, _amount);
        emit Transfer(address(0), _to, _amount);
        return true;
    }

    /**
    * @dev Function to stop minting new tokens.
    * @return True if the operation was successful.
    */
    function finishMinting() 
    public  
    onlyOwner canMint
    returns (bool) 
    {
        mintingFinished = true;
        emit MintFinished();
        return true;
    }
    
    event Burn(address indexed burner, uint256 value);

    /**
    * @dev Burns a specific amount of tokens.
    * @param _value The amount of token to be burned.
    */
    function burn(
        uint256 _value
    ) 
    public 
    {
        _burn(msg.sender, _value);
    }

    function _burn(
        address _who, 
        uint256 _value
    ) 
    internal 
    {
        require(_value <= balances[_who]);
        // no need to require value <= totalSupply, since that would imply the
        // sender's balance is greater than the totalSupply, which *should* be an assertion failure

        balances[_who] = balances[_who].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);
        emit Burn(_who, _value);
        emit Transfer(_who, address(0), _value);
    }
}

/**
 * @title Math
 * @dev Assorted math operations
 */
/**
 * @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 c) 
    {
        // Gas optimization: this is cheaper than asserting '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;
        }

        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 a / b;
    }

    /**
    * @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 c) 
    {
        c = a + b;
        assert(c >= a);
        return c;
    }
}