// File: BasicToken.sol



pragma solidity ^0.4.24;


import "./ERC20Basic.sol";
import "./SafeMath.sol";


/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
    using SafeMath for uint256;

    mapping(address => uint256) internal balances;

    uint256 internal 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(_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 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: DetailedERC20.sol



pragma solidity ^0.4.24;

import "./ERC20.sol";


/**
 * @title DetailedERC20 token
 * @dev The decimals are only for visualization purposes.
 * All the operations are done using the smallest and indivisible token unit,
 * just as on Ethereum all the operations are done in wei.
 */
contract DetailedERC20 is ERC20 {
    string public name;
    string public symbol;
    uint8 public decimals;

    constructor(string _name, string _symbol, uint8 _decimals) public {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
    }
}

// File: ERC1132.sol



pragma solidity ^0.4.24;

/**
 * @title ERC1132 interface
 * @dev see https://github.com/ethereum/EIPs/issues/1132
 */

contract ERC1132 {
    /**
     * @dev Reasons why a user's tokens have been locked
     */
    mapping(address => bytes32[]) internal lockReason;

    /**
     * @dev locked token structure
     */
    struct lockToken {
        uint256 amount;
        uint256 validity;
        bool claimed;
    }

    /**
     * @dev Holds number & validity of tokens locked for a given reason for
     *      a specified address
     */
    mapping(address => mapping(bytes32 => lockToken)) internal locked;

    /**
     * @dev Records data of all the tokens Locked
     */
    event Locked(
        address indexed _of,
        bytes32 indexed _reason,
        uint256 _amount,
        uint256 _validity
    );

    /**
     * @dev Records data of all the tokens unlocked
     */
    event Unlocked(
        address indexed _of,
        bytes32 indexed _reason,
        uint256 _amount
    );

    /**
     * @dev Locks a specified amount of tokens against an address,
     *      for a specified reason and time
     * @param _reason The reason to lock tokens
     * @param _amount Number of tokens to be locked
     * @param _time Lock time in seconds
     */
    function lock(bytes32 _reason, uint256 _amount, uint256 _time)
    public returns (bool);

    /**
     * @dev Returns tokens locked for a specified address for a
     *      specified reason
     *
     * @param _of The address whose tokens are locked
     * @param _reason The reason to query the lock tokens for
     */
    function tokensLocked(address _of, bytes32 _reason)
    public view returns (uint256 amount);

    /**
     * @dev Returns tokens locked for a specified address for a
     *      specified reason at a specific time
     *
     * @param _of The address whose tokens are locked
     * @param _reason The reason to query the lock tokens for
     * @param _time The timestamp to query the lock tokens for
     */
    function tokensLockedAtTime(address _of, bytes32 _reason, uint256 _time)
    public view returns (uint256 amount);

    /**
     * @dev Returns total tokens held by an address (locked + transferable)
     * @param _of The address to query the total balance of
     */
    function totalBalanceOf(address _of)
    public view returns (uint256 amount);

    /**
     * @dev Extends lock for a specified reason and time
     * @param _reason The reason to lock tokens
     * @param _time Lock extension time in seconds
     */
    function extendLock(bytes32 _reason, uint256 _time)
    public returns (bool);

    /**
     * @dev Increase number of tokens locked for a specified reason
     * @param _reason The reason to lock tokens
     * @param _amount Number of tokens to be increased
     */
    function increaseLockAmount(bytes32 _reason, uint256 _amount)
    public returns (bool);

    /**
     * @dev Returns unlockable tokens for a specified address for a specified reason
     * @param _of The address to query the the unlockable token count of
     * @param _reason The reason to query the unlockable tokens for
     */
    function tokensUnlockable(address _of, bytes32 _reason)
    public view returns (uint256 amount);

    /**
     * @dev Unlocks the unlockable tokens of a specified address
     * @param _of Address of user, claiming back unlockable tokens
     */
    function unlock(address _of)
    public returns (uint256 unlockableTokens);

    /**
     * @dev Gets the unlockable tokens of a specified address
     * @param _of The address to query the the unlockable token count of
     */
    function getUnlockableTokens(address _of)
    public view returns (uint256 unlockableTokens);

}
// File: ERC20.sol



pragma solidity ^0.4.24;

import "./ERC20Basic.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: ERC20Basic.sol



pragma solidity ^0.4.24;


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * 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: IaToken.sol



pragma solidity ^0.4.2;

import "./Lockable.sol";

contract IaToken is Lockable{
    constructor(string _name, string _symbol, uint8 _decimals)
    DetailedERC20(_name, _symbol, _decimals)
    public{
        totalSupply_ = 5000000000 * 10 ** 18;
        balances[msg.sender] = totalSupply_;
    }
}

// File: Lockable.sol



pragma solidity ^0.4.0;

import "./ERC1132.sol";
import "./StandardToken.sol";
import "./DetailedERC20.sol";


contract Lockable is StandardToken, DetailedERC20, ERC1132{

    /**
   * @dev Error messages for require statements
   */
    string internal constant ALREADY_LOCKED = 'Tokens already locked';
    string internal constant NOT_LOCKED = 'No tokens locked';
    string internal constant AMOUNT_ZERO = 'Amount can not be 0';


    /**
     * @dev Locks a specified amount of tokens against an address,
     *      for a specified reason and time
     * @param _reason The reason to lock tokens
     * @param _amount Number of tokens to be locked
     * @param _time Lock time in seconds
     */
    function lock(bytes32 _reason, uint256 _amount, uint256 _time)
    public
    returns (bool)
    {
        uint256 validUntil = now.add(_time);

        // If tokens are already locked, then functions extendLock or
        // increaseLockAmount should be used to make any changes
        require(tokensLocked(msg.sender, _reason) == 0, ALREADY_LOCKED);
        require(_amount != 0, AMOUNT_ZERO);

        if (locked[msg.sender][_reason].amount == 0)
            lockReason[msg.sender].push(_reason);

        transfer(address(this), _amount);

        locked[msg.sender][_reason] = lockToken(_amount, validUntil, false);

        emit Locked(msg.sender, _reason, _amount, validUntil);
        return true;
    }



    /**
     * @dev Transfers and Locks a specified amount of tokens,
     *      for a specified reason and time
     * @param _to adress to which tokens are to be transfered
     * @param _reason The reason to lock tokens
     * @param _amount Number of tokens to be transfered and locked
     * @param _time Lock time in seconds
     */
    function transferWithLock(address _to, bytes32 _reason, uint256 _amount, uint256 _time)
    public
    returns (bool)
    {
        uint256 validUntil = now.add(_time);

        require(tokensLocked(_to, _reason) == 0, ALREADY_LOCKED);
        require(_amount != 0, AMOUNT_ZERO);

        if (locked[_to][_reason].amount == 0)
            lockReason[_to].push(_reason);

        transfer(address(this), _amount);

        locked[_to][_reason] = lockToken(_amount, validUntil, false);

        emit Locked(_to, _reason, _amount, validUntil);
        return true;
    }



    /**
     * @dev Returns tokens locked for a specified address for a
     *      specified reason
     *
     * @param _of The address whose tokens are locked
     * @param _reason The reason to query the lock tokens for
     */
    function tokensLocked(address _of, bytes32 _reason)
    public
    view
    returns (uint256 amount)
    {
        if (!locked[_of][_reason].claimed)
            amount = locked[_of][_reason].amount;
    }



    /**
     * @dev Returns tokens locked for a specified address for a
     *      specified reason at a specific time
     *
     * @param _of The address whose tokens are locked
     * @param _reason The reason to query the lock tokens for
     * @param _time The timestamp to query the lock tokens for
     */
    function tokensLockedAtTime(address _of, bytes32 _reason, uint256 _time)
    public
    view
    returns (uint256 amount)
    {
        if (locked[_of][_reason].validity > _time)
            amount = locked[_of][_reason].amount;
    }



    /**
     * @dev Returns total tokens held by an address (locked + transferable)
     * @param _of The address to query the total balance of
     */
    function totalBalanceOf(address _of)
    public
    view
    returns (uint256 amount)
    {
        amount = balanceOf(_of);

        for (uint256 i = 0; i < lockReason[_of].length; i++) {
            amount = amount.add(tokensLocked(_of, lockReason[_of][i]));
        }
    }



    /**
     * @dev Extends lock for a specified reason and time
     * @param _reason The reason to lock tokens
     * @param _time Lock extension time in seconds
     */
    function extendLock(bytes32 _reason, uint256 _time)
    public
    returns (bool)
    {
        require(tokensLocked(msg.sender, _reason) > 0, NOT_LOCKED);

        locked[msg.sender][_reason].validity = locked[msg.sender][_reason].validity.add(_time);

        emit Locked(msg.sender, _reason, locked[msg.sender][_reason].amount, locked[msg.sender][_reason].validity);
        return true;
    }



    /**
     * @dev Increase number of tokens locked for a specified reason
     * @param _reason The reason to lock tokens
     * @param _amount Number of tokens to be increased
     */
    function increaseLockAmount(bytes32 _reason, uint256 _amount)
    public
    returns (bool)
    {
        require(tokensLocked(msg.sender, _reason) > 0, NOT_LOCKED);
        transfer(address(this), _amount);

        locked[msg.sender][_reason].amount = locked[msg.sender][_reason].amount.add(_amount);

        emit Locked(msg.sender, _reason, locked[msg.sender][_reason].amount, locked[msg.sender][_reason].validity);
        return true;
    }



    /**
     * @dev Returns unlockable tokens for a specified address for a specified reason
     * @param _of The address to query the the unlockable token count of
     * @param _reason The reason to query the unlockable tokens for
     */
    function tokensUnlockable(address _of, bytes32 _reason)
    public
    view
    returns (uint256 amount)
    {
        if (locked[_of][_reason].validity <= now && !locked[_of][_reason].claimed) //solhint-disable-line
            amount = locked[_of][_reason].amount;
    }



    /**
     * @dev Unlocks the unlockable tokens of a specified address
     * @param _of Address of user, claiming back unlockable tokens
     */
    function unlock(address _of)
    public
    returns (uint256 unlockableTokens)
    {
        uint256 lockedTokens;

        for (uint256 i = 0; i < lockReason[_of].length; i++) {
            lockedTokens = tokensUnlockable(_of, lockReason[_of][i]);
            if (lockedTokens > 0) {
                unlockableTokens = unlockableTokens.add(lockedTokens);
                locked[_of][lockReason[_of][i]].claimed = true;
                emit Unlocked(_of, lockReason[_of][i], lockedTokens);
            }
        }

        if (unlockableTokens > 0)
            this.transfer(_of, unlockableTokens);
    }



    /**
     * @dev Gets the unlockable tokens of a specified address
     * @param _of The address to query the the unlockable token count of
     */
    function getUnlockableTokens(address _of)
    public
    view
    returns (uint256 unlockableTokens)
    {
        for (uint256 i = 0; i < lockReason[_of].length; i++) {
            unlockableTokens = unlockableTokens.add(tokensUnlockable(_of, lockReason[_of][i]));
        }
    }

}

// File: SafeMath.sol



pragma solidity ^0.4.24;


/**
 * @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: StandardToken.sol



pragma solidity ^0.4.24;

import "./BasicToken.sol";
import "./ERC20.sol";


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/issues/20
 * 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(_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 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,
        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;
    }

}