pragma solidity ^0.4.23;

// File: contracts/ERC223.sol

/**
 * @title Interface for an ERC223 Contract
 * @author Amr Gawish <amr@gawi.sh>
 * @dev Only one method is unique to contracts `transfer(address _to, uint _value, bytes _data)`
 * @notice The interface has been stripped to its unique methods to prevent duplicating methods with ERC20 interface
*/
interface ERC223 {
    function transfer(address _to, uint _value, bytes _data) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint value, bytes indexed data);
}

// File: contracts/ERC223ReceivingContract.sol

/**
 * @title Contract that will work with ERC223 tokens.
 */
 
contract ERC223ReceivingContract { 

    /**
    * @dev Standard ERC223 function that will handle incoming token transfers.
    *
    * @param _from  Token sender address.
    * @param _value Amount of tokens.
    * @param _data  Transaction metadata.
    */
    function tokenFallback(address _from, uint _value, bytes _data) public;
}

// File: openzeppelin-solidity/contracts/ownership/Ownable.sol

/**
 * @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 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.
   */
  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;
  }
}

// File: contracts/OperatorManaged.sol

// Simple JSE Operator management contract
contract OperatorManaged is Ownable {

    address public operatorAddress;
    address public adminAddress;

    event AdminAddressChanged(address indexed _newAddress);
    event OperatorAddressChanged(address indexed _newAddress);


    constructor() public
        Ownable()
    {
        adminAddress = msg.sender;
    }

    modifier onlyAdmin() {
        require(isAdmin(msg.sender));
        _;
    }


    modifier onlyAdminOrOperator() {
        require(isAdmin(msg.sender) || isOperator(msg.sender));
        _;
    }


    modifier onlyOwnerOrAdmin() {
        require(isOwner(msg.sender) || isAdmin(msg.sender));
        _;
    }


    modifier onlyOperator() {
        require(isOperator(msg.sender));
        _;
    }


    function isAdmin(address _address) internal view returns (bool) {
        return (adminAddress != address(0) && _address == adminAddress);
    }


    function isOperator(address _address) internal view returns (bool) {
        return (operatorAddress != address(0) && _address == operatorAddress);
    }

    function isOwner(address _address) internal view returns (bool) {
        return (owner != address(0) && _address == owner);
    }


    function isOwnerOrOperator(address _address) internal view returns (bool) {
        return (isOwner(_address) || isOperator(_address));
    }


    // Owner and Admin can change the admin address. Address can also be set to 0 to 'disable' it.
    function setAdminAddress(address _adminAddress) external onlyOwnerOrAdmin returns (bool) {
        require(_adminAddress != owner);
        require(_adminAddress != address(this));
        require(!isOperator(_adminAddress));

        adminAddress = _adminAddress;

        emit AdminAddressChanged(_adminAddress);

        return true;
    }


    // Owner and Admin can change the operations address. Address can also be set to 0 to 'disable' it.
    function setOperatorAddress(address _operatorAddress) external onlyOwnerOrAdmin returns (bool) {
        require(_operatorAddress != owner);
        require(_operatorAddress != address(this));
        require(!isAdmin(_operatorAddress));

        operatorAddress = _operatorAddress;

        emit OperatorAddressChanged(_operatorAddress);

        return true;
    }
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

/**
 * @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;
  }
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  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);
}

// File: openzeppelin-solidity/contracts/token/ERC20/BasicToken.sol

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

  /**
  * @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) {
    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);
    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) {
    return balances[_owner];
  }

}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

/**
 * @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
  );
}

// File: openzeppelin-solidity/contracts/token/ERC20/StandardToken.sol

/**
 * @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);
    emit 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;
    emit 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];
  }

  /**
   * @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,
    uint _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,
    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);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

// File: openzeppelin-solidity/contracts/token/ERC20//MintableToken.sol

/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * @dev Issue: * https://github.com/OpenZeppelin/openzeppelin-solidity/issues/120
 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
 */
contract MintableToken is StandardToken, Ownable {
  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
  )
    hasMintPermission
    canMint
    public
    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() onlyOwner canMint public returns (bool) {
    mintingFinished = true;
    emit MintFinished();
    return true;
  }
}

// File: openzeppelin-solidity/contracts/token/ERC20/BurnableToken.sol

/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract BurnableToken is BasicToken {

  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);
  }
}

// File: contracts/JSEToken.sol

/**
 * @title Main Token Contract for JSE Coin
 * @author Amr Gawish <amr@gawi.sh>
 * @dev This Token is the Mintable and Burnable to allow variety of actions to be done by users.
 * @dev It also complies with both ERC20 and ERC223.
 * @notice Trying to use JSE Token to Contracts that doesn't accept tokens and doesn't have tokenFallback function will fail, and all contracts
 * must comply to ERC223 compliance. 
*/
contract JSEToken is ERC223, BurnableToken, Ownable, MintableToken, OperatorManaged {
    
    event Finalized();

    string public name = "JSE Token";
    string public symbol = "JSE";
    uint public decimals = 18;
    uint public initialSupply = 10000000000 * (10 ** decimals); //10,000,000,000 aka 10 billion

    bool public finalized;

    constructor() OperatorManaged() public {
        totalSupply_ = initialSupply;
        balances[msg.sender] = initialSupply; 

        emit Transfer(0x0, msg.sender, initialSupply);
    }


    // Implementation of the standard transferFrom method that takes into account the finalize flag.
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        checkTransferAllowed(msg.sender, _to);

        return super.transferFrom(_from, _to, _value);
    }

    function checkTransferAllowed(address _sender, address _to) private view {
        if (finalized) {
            // Everybody should be ok to transfer once the token is finalized.
            return;
        }

        // Owner and Ops are allowed to transfer tokens before the sale is finalized.
        // This allows the tokens to move from the TokenSale contract to a beneficiary.
        // We also allow someone to send tokens back to the owner. This is useful among other
        // cases, for the Trustee to transfer unlocked tokens back to the owner (reclaimTokens).
        require(isOwnerOrOperator(_sender) || _to == owner);
    }

    // Implementation of the standard transfer method that takes into account the finalize flag.
    function transfer(address _to, uint256 _value) public returns (bool success) {
        checkTransferAllowed(msg.sender, _to);

        return super.transfer(_to, _value);
    }

    /**
    * @dev transfer token for a specified contract address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    * @param _data Additional Data sent to the contract.
    */
    function transfer(address _to, uint _value, bytes _data) external returns (bool) {
        checkTransferAllowed(msg.sender, _to);

        require(_to != address(0));
        require(_value <= balances[msg.sender]);
        require(isContract(_to));


        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        ERC223ReceivingContract erc223Contract = ERC223ReceivingContract(_to);
        erc223Contract.tokenFallback(msg.sender, _value, _data);

        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    /** 
    * @dev Owner can transfer out any accidentally sent ERC20 tokens
    */
    function transferAnyERC20Token(address tokenAddress, uint tokens) public onlyOwner returns (bool success) {
        return ERC20(tokenAddress).transfer(owner, tokens);
    }

    function isContract(address _addr) private view returns (bool) {
        uint codeSize;
        /* solium-disable-next-line */
        assembly {
            codeSize := extcodesize(_addr)
        }
        return codeSize > 0;
    }

    // Finalize method marks the point where token transfers are finally allowed for everybody.
    function finalize() external onlyAdmin returns (bool success) {
        require(!finalized);

        finalized = true;

        emit Finalized();

        return true;
    }
}