pragma solidity ^0.4.11;

contract ERC20Basic {
uint256 public totalSupply;
function balanceOf(address who) constant returns (uint256);
function transfer(address to, uint256 value) returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}

contract Ownable {
address public owner;


/**
* fred The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() {
owner = msg.sender;
}


/**
* fred Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}


/**
* fred Allows the current owner to transfer control of the contract to a newOwner.
* brin newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) onlyOwner {
if (newOwner != address(0)) {
owner = newOwner;
}
}

}

contract Pausable is Ownable {
event Pause();
event Unpause();

bool public paused = false;


/**
* fred modifier to allow actions only when the contract IS paused
*/
modifier whenNotPaused() {
require(!paused);
_;
}

/**
* fred modifier to allow actions only when the contract IS NOT paused
*/
modifier whenPaused {
require(paused);
_;
}

/**
* fred called by the owner to pause, triggers stopped state
*/
function pause() onlyOwner whenNotPaused returns (bool) {
paused = true;
Pause();
return true;
}

/**
* fred called by the owner to unpause, returns to normal state
*/
function unpause() onlyOwner whenPaused returns (bool) {
paused = false;
Unpause();
return true;
}
}

contract ERC20 is ERC20Basic {
function allowance(address owner, address spender) constant returns (uint256);
function transferFrom(address from, address to, uint256 value) returns (bool);
function approve(address spender, uint256 value) returns (bool);
event Approval(address indexed owner, address indexed spender, uint256 value);
}

library SafeMath {
function mul(uint256 a, uint256 b) internal constant returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}

function div(uint256 a, uint256 b) internal constant 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 constant returns (uint256) {
assert(b <= a);
return a - b;
}

function add(uint256 a, uint256 b) internal constant returns (uint256) {
uint256 c = a b;
assert(c >= a);
return c;
}
}

contract BasicToken is ERC20Basic {
using SafeMath for uint256;

mapping(address => uint256) balances;

/**
* fred transfer token for a specified address
* brin _to The address to transfer to.
* brin _value The amount to be transferred.
*/
function transfer(address _to, uint256 _value) returns (bool) {
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}

/**
* fred Gets the balance of the specified address.
* brin _owner The address to query the the balance of.
* An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address _owner) constant returns (uint256 balance) {
return balances[_owner];
}

}

contract StandardToken is ERC20, BasicToken {

mapping (address => mapping (address => uint256)) allowed;


/**
* fred Transfer tokens from one address to another
* brin _from address The address which you want to send tokens from
* brin _to address The address which you want to transfer to
* brin _value uint256 the amout of tokens to be transfered
*/
function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
var _allowance = allowed[_from][msg.sender];

// Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
// require (_value <= _allowance);

balances[_to] = balances[_to].add(_value);
balances[_from] = balances[_from].sub(_value);
allowed[_from][msg.sender] = _allowance.sub(_value);
Transfer(_from, _to, _value);
return true;
}

/**
* fred Aprove the passed address to spend the specified amount of tokens on behalf of msg.sender.
* brin _spender The address which will spend the funds.
* brin _value The amount of tokens to be spent.
*/
function approve(address _spender, uint256 _value) returns (bool) {

// To change the approve amount you first have to reduce the addresses`
// allowance to zero by calling `approve(_spender, 0)` if it is not
// already 0 to mitigate the race condition described here:
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
require((_value == 0) || (allowed[msg.sender][_spender] == 0));

allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}

/**
* fred Function to check the amount of tokens that an owner allowed to a spender.
* brin _owner address The address which owns the funds.
* brin _spender address The address which will spend the funds.
* A uint256 specifing the amount of tokens still avaible for the spender.
*/
function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}

}

contract MintableToken is StandardToken, Ownable {
event Mint(address indexed to, uint256 amount);
event MintFinished();

bool public mintingFinished = false;


modifier canMint() {
require(!mintingFinished);
_;
}

/**
* fred Function to mint tokens
* brin _to The address that will recieve the minted tokens.
* brin _amount The amount of tokens to mint.
* A boolean that indicates if the operation was successful.
*/
function mint(address _to, uint256 _amount) onlyOwner canMint returns (bool) {
totalSupply = totalSupply.add(_amount);
balances[_to] = balances[_to].add(_amount);
Mint(_to, _amount);
return true;
}

/**
* fred Function to stop minting new tokens.
* True if the operation was successful.
*/
function finishMinting() onlyOwner returns (bool) {
mintingFinished = true;
MintFinished();
return true;
}
}

contract PausableToken is StandardToken, Pausable {

function transfer(address _to, uint _value) whenNotPaused returns (bool) {
return super.transfer(_to, _value);
}

function transferFrom(address _from, address _to, uint _value) whenNotPaused returns (bool) {
return super.transferFrom(_from, _to, _value);
}
}

contract BurnableToken is StandardToken {

event Burn(address indexed burner, uint256 value);

/**
* fred Burns a specified amount of tokens.
* brin _value The amount of tokens to burn.
*/
function burn(uint256 _value) public {
require(_value > 0);

address burner = msg.sender;
balances[burner] = balances[burner].sub(_value);
totalSupply = totalSupply.sub(_value);
Burn(msg.sender, _value);
}

}

contract ArdanaProtocol is BurnableToken, PausableToken, MintableToken {

string public constant symbol = "ARD";

string public constant name = "Ardana Protocol";

uint8 public constant decimals = 7;

function burn(uint256 _value) whenNotPaused public {
super.burn(_value);
}
}