pragma solidity ^0.4.24;

// 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/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: contracts/interface/IBasicMultiToken.sol

contract IBasicMultiToken is ERC20 {
    event Bundle(address indexed who, address indexed beneficiary, uint256 value);
    event Unbundle(address indexed who, address indexed beneficiary, uint256 value);

    function tokensCount() public view returns(uint256);
    function tokens(uint256 _index) public view returns(ERC20);
    function allTokens() public view returns(ERC20[]);
    function allDecimals() public view returns(uint8[]);
    function allBalances() public view returns(uint256[]);
    function allTokensDecimalsBalances() public view returns(ERC20[], uint8[], uint256[]);

    function bundleFirstTokens(address _beneficiary, uint256 _amount, uint256[] _tokenAmounts) public;
    function bundle(address _beneficiary, uint256 _amount) public;

    function unbundle(address _beneficiary, uint256 _value) public;
    function unbundleSome(address _beneficiary, uint256 _value, ERC20[] _tokens) public;

    function denyBundling() public;
    function allowBundling() public;
}

// File: contracts/interface/IMultiToken.sol

contract IMultiToken is IBasicMultiToken {
    event Update();
    event Change(address indexed _fromToken, address indexed _toToken, address indexed _changer, uint256 _amount, uint256 _return);

    function getReturn(address _fromToken, address _toToken, uint256 _amount) public view returns (uint256 returnAmount);
    function change(address _fromToken, address _toToken, uint256 _amount, uint256 _minReturn) public returns (uint256 returnAmount);

    function allWeights() public view returns(uint256[] _weights);
    function allTokensDecimalsBalancesWeights() public view returns(ERC20[] _tokens, uint8[] _decimals, uint256[] _balances, uint256[] _weights);

    function denyChanges() 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/registry/IDeployer.sol

contract IDeployer is Ownable {
    function deploy(bytes data) external returns(address mtkn);
}

// File: openzeppelin-solidity/contracts/lifecycle/Pausable.sol

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    emit Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    emit Unpause();
  }
}

// File: contracts/registry/MultiTokenNetwork.sol

contract MultiTokenNetwork is Pausable {

    event NewMultitoken(address indexed mtkn);
    event NewDeployer(uint256 indexed index, address indexed oldDeployer, address indexed newDeployer);

    address[] public multitokens;
    mapping(uint256 => IDeployer) public deployers;

    function multitokensCount() public view returns(uint256) {
        return multitokens.length;
    }

    function allMultitokens() public view returns(address[]) {
        return multitokens;
    }

    function allWalletBalances(address wallet) public view returns(uint256[]) {
        uint256[] memory balances = new uint256[](multitokens.length);
        for (uint i = 0; i < multitokens.length; i++) {
            balances[i] = ERC20(multitokens[i]).balanceOf(wallet);
        }
        return balances;
    }

    function deleteMultitoken(uint index) public onlyOwner {
        require(index < multitokens.length, "deleteMultitoken: index out of range");
        if (index != multitokens.length - 1) {
            multitokens[index] = multitokens[multitokens.length - 1];
        }
        multitokens.length -= 1;
    }

    function denyBundlingMultitoken(uint index) public onlyOwner {
        IBasicMultiToken(multitokens[index]).denyBundling();
    }

    function allowBundlingMultitoken(uint index) public onlyOwner {
        IBasicMultiToken(multitokens[index]).allowBundling();
    }

    function denyChangesMultitoken(uint index) public onlyOwner {
        IMultiToken(multitokens[index]).denyChanges();
    }

    function setDeployer(uint256 index, IDeployer deployer) public onlyOwner whenNotPaused {
        require(deployer.owner() == address(this), "setDeployer: first set MultiTokenNetwork as owner");
        emit NewDeployer(index, deployers[index], deployer);
        deployers[index] = deployer;
    }

    function deploy(uint256 index, bytes data) public whenNotPaused {
        address mtkn = deployers[index].deploy(data);
        multitokens.push(mtkn);
        emit NewMultitoken(mtkn);
    }
}