pragma solidity ^0.4.21;

// File: contracts/ownership/MultiOwnable.sol

/**
 * @title MultiOwnable
 * @dev The MultiOwnable contract has owners addresses and provides basic authorization control
 * functions, this simplifies the implementation of "users permissions".
 */
contract MultiOwnable {
    address public manager; // address used to set owners
    address[] public owners;
    mapping(address => bool) public ownerByAddress;

    event SetOwners(address[] owners);

    modifier onlyOwner() {
        require(ownerByAddress[msg.sender] == true);
        _;
    }

    /**
     * @dev MultiOwnable constructor sets the manager
     */
    function MultiOwnable() public {
        manager = msg.sender;
    }

    /**
     * @dev Function to set owners addresses
     */
    function setOwners(address[] _owners) public {
        require(msg.sender == manager);
        _setOwners(_owners);

    }

    function _setOwners(address[] _owners) internal {
        for(uint256 i = 0; i < owners.length; i++) {
            ownerByAddress[owners[i]] = false;
        }


        for(uint256 j = 0; j < _owners.length; j++) {
            ownerByAddress[_owners[j]] = true;
        }
        owners = _owners;
        SetOwners(_owners);
    }

    function getOwners() public constant returns (address[]) {
        return owners;
    }
}

// File: contracts/math/SafeMath.sol

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
contract SafeMath {
    /**
    * @dev constructor
    */
    function SafeMath() public {
    }

    function safeMul(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }

    function safeDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a / b;
        return c;
    }

    function safeSub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(a >= b);
        return a - b;
    }

    function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

// File: contracts/token/IERC20Token.sol

/**
 * @title IERC20Token - ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract IERC20Token {
    string public name;
    string public symbol;
    uint8 public decimals;
    uint256 public totalSupply;

    function balanceOf(address _owner) public constant returns (uint256 balance);
    function transfer(address _to, uint256 _value)  public returns (bool success);
    function transferFrom(address _from, address _to, uint256 _value)  public returns (bool success);
    function approve(address _spender, uint256 _value)  public returns (bool success);
    function allowance(address _owner, address _spender)  public constant returns (uint256 remaining);

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}

// File: contracts/token/ERC20Token.sol

/**
 * @title ERC20Token - ERC20 base implementation
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20Token is IERC20Token, SafeMath {
    mapping (address => uint256) public balances;
    mapping (address => mapping (address => uint256)) public allowed;

    function transfer(address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));
        require(balances[msg.sender] >= _value);

        balances[msg.sender] = safeSub(balances[msg.sender], _value);
        balances[_to] = safeAdd(balances[_to], _value);
        Transfer(msg.sender, _to, _value);
        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));
        require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value);

        balances[_to] = safeAdd(balances[_to], _value);
        balances[_from] = safeSub(balances[_from], _value);
        allowed[_from][msg.sender] = safeSub(allowed[_from][msg.sender], _value);
        Transfer(_from, _to, _value);
        return true;
    }

    function balanceOf(address _owner) public constant returns (uint256) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) public returns (bool) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) public constant returns (uint256) {
      return allowed[_owner][_spender];
    }
}

// File: contracts/token/ITokenEventListener.sol

/**
 * @title ITokenEventListener
 * @dev Interface which should be implemented by token listener
 */
interface ITokenEventListener {
    /**
     * @dev Function is called after token transfer/transferFrom
     * @param _from Sender address
     * @param _to Receiver address
     * @param _value Amount of tokens
     */
    function onTokenTransfer(address _from, address _to, uint256 _value) external;
}

// File: contracts/token/ManagedToken.sol

/**
 * @title ManagedToken
 * @dev ERC20 compatible token with issue and destroy facilities
 * @dev All transfers can be monitored by token event listener
 */
contract ManagedToken is ERC20Token, MultiOwnable {
    bool public allowTransfers = false;
    bool public issuanceFinished = false;

    ITokenEventListener public eventListener;

    event AllowTransfersChanged(bool _newState);
    event Issue(address indexed _to, uint256 _value);
    event Destroy(address indexed _from, uint256 _value);
    event IssuanceFinished();

    modifier transfersAllowed() {
        require(allowTransfers);
        _;
    }

    modifier canIssue() {
        require(!issuanceFinished);
        _;
    }

    /**
     * @dev ManagedToken constructor
     * @param _listener Token listener(address can be 0x0)
     * @param _owners Owners list
     */
    function ManagedToken(address _listener, address[] _owners) public {
        if(_listener != address(0)) {
            eventListener = ITokenEventListener(_listener);
        }
        _setOwners(_owners);
    }

    /**
     * @dev Enable/disable token transfers. Can be called only by owners
     * @param _allowTransfers True - allow False - disable
     */
    function setAllowTransfers(bool _allowTransfers) external onlyOwner {
        allowTransfers = _allowTransfers;
        AllowTransfersChanged(_allowTransfers);
    }

    /**
     * @dev Set/remove token event listener
     * @param _listener Listener address (Contract must implement ITokenEventListener interface)
     */
    function setListener(address _listener) public onlyOwner {
        if(_listener != address(0)) {
            eventListener = ITokenEventListener(_listener);
        } else {
            delete eventListener;
        }
    }

    function transfer(address _to, uint256 _value) public transfersAllowed returns (bool) {
        bool success = super.transfer(_to, _value);
        if(hasListener() && success) {
            eventListener.onTokenTransfer(msg.sender, _to, _value);
        }
        return success;
    }

    function transferFrom(address _from, address _to, uint256 _value) public transfersAllowed returns (bool) {
        bool success = super.transferFrom(_from, _to, _value);
        if(hasListener() && success) {
            eventListener.onTokenTransfer(_from, _to, _value);
        }
        return success;
    }

    function hasListener() internal view returns(bool) {
        if(eventListener == address(0)) {
            return false;
        }
        return true;
    }

    /**
     * @dev Issue tokens to specified wallet
     * @param _to Wallet address
     * @param _value Amount of tokens
     */
    function issue(address _to, uint256 _value) external onlyOwner canIssue {
        totalSupply = safeAdd(totalSupply, _value);
        balances[_to] = safeAdd(balances[_to], _value);
        Issue(_to, _value);
        Transfer(address(0), _to, _value);
    }

    /**
     * @dev Destroy tokens on specified address (Called by owner or token holder)
     * @dev Fund contract address must be in the list of owners to burn token during refund
     * @param _from Wallet address
     * @param _value Amount of tokens to destroy
     */
    function destroy(address _from, uint256 _value) external {
        require(ownerByAddress[msg.sender] || msg.sender == _from);
        require(balances[_from] >= _value);
        totalSupply = safeSub(totalSupply, _value);
        balances[_from] = safeSub(balances[_from], _value);
        Transfer(_from, address(0), _value);
        Destroy(_from, _value);
    }

    /**
     * @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 OpenZeppelin StandardToken.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] = safeAdd(allowed[msg.sender][_spender], _addedValue);
        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 OpenZeppelin StandardToken.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] = safeSub(oldValue, _subtractedValue);
        }
        Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    /**
     * @dev Finish token issuance
     * @return True if success
     */
    function finishIssuance() public onlyOwner returns (bool) {
        issuanceFinished = true;
        IssuanceFinished();
        return true;
    }
}

// File: contracts/token/TransferLimitedToken.sol

/**
 * @title TransferLimitedToken
 * @dev Token with ability to limit transfers within wallets included in limitedWallets list for certain period of time
 */
contract TransferLimitedToken is ManagedToken {
    uint256 public constant LIMIT_TRANSFERS_PERIOD = 365 days;

    mapping(address => bool) public limitedWallets;
    uint256 public limitEndDate;
    address public limitedWalletsManager;
    bool public isLimitEnabled;

    event TransfersEnabled();

    modifier onlyManager() {
        require(msg.sender == limitedWalletsManager);
        _;
    }

    /**
     * @dev Check if transfer between addresses is available
     * @param _from From address
     * @param _to To address
     */
    modifier canTransfer(address _from, address _to)  {
        require(now >= limitEndDate || !isLimitEnabled || (!limitedWallets[_from] && !limitedWallets[_to]));
        _;
    }

    /**
     * @dev TransferLimitedToken constructor
     * @param _limitStartDate Limit start date
     * @param _listener Token listener(address can be 0x0)
     * @param _owners Owners list
     * @param _limitedWalletsManager Address used to add/del wallets from limitedWallets
     */
    function TransferLimitedToken(
        uint256 _limitStartDate,
        address _listener,
        address[] _owners,
        address _limitedWalletsManager
    ) public ManagedToken(_listener, _owners)
    {
        limitEndDate = _limitStartDate + LIMIT_TRANSFERS_PERIOD;
        isLimitEnabled = true;
        limitedWalletsManager = _limitedWalletsManager;
    }

    /**
     * @dev Enable token transfers
     */
    function enableTransfers() public {
        require(msg.sender == limitedWalletsManager);
        allowTransfers = true;
        TransfersEnabled();
    }

    /**
     * @dev Add address to limitedWallets
     * @dev Can be called only by manager
     */
    function addLimitedWalletAddress(address _wallet) public {
        require(msg.sender == limitedWalletsManager || ownerByAddress[msg.sender]);
        limitedWallets[_wallet] = true;
    }

    /**
     * @dev Del address from limitedWallets
     * @dev Can be called only by manager
     */
    function delLimitedWalletAddress(address _wallet) public onlyManager {
        limitedWallets[_wallet] = false;
    }

    /**
     * @dev Disable transfer limit manually. Can be called only by manager
     */
    function disableLimit() public onlyManager {
        isLimitEnabled = false;
    }

    function transfer(address _to, uint256 _value) public canTransfer(msg.sender, _to) returns (bool) {
        return super.transfer(_to, _value);
    }

    function transferFrom(address _from, address _to, uint256 _value) public canTransfer(_from, _to) returns (bool) {
        return super.transferFrom(_from, _to, _value);
    }

    function approve(address _spender, uint256 _value) public canTransfer(msg.sender, _spender) returns (bool) {
        return super.approve(_spender,_value);
    }
}

// File: contracts/EvolthToken.sol

contract EVOLTH is TransferLimitedToken {
    uint256 public constant SALE_END_TIME = 1538956800; // 08.10.2018 08:00:00 UTC

    function EVOLTH(address _listener, address[] _owners, address manager) public
        TransferLimitedToken(SALE_END_TIME, _listener, _owners, manager)
    {
        name = "EVOLTH";
        symbol = "EVH";
        decimals = 18;
    }
}