pragma solidity ^0.4.18;

// File: zeppelin-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 OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() 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 transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

// File: zeppelin-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) {
    if (a == 0) {
      return 0;
    }
    uint256 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 c;
  }

  /**
  * @dev Substracts 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) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

// File: zeppelin-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: zeppelin-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]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    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 balance) {
    return balances[_owner];
  }

}

// File: zeppelin-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: zeppelin-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);
    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;
    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);
    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);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

// File: zeppelin-solidity/contracts/token/ERC20/MintableToken.sol

/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * @dev Issue: * https://github.com/OpenZeppelin/zeppelin-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);
    _;
  }

  /**
   * @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) onlyOwner canMint public returns (bool) {
    totalSupply_ = totalSupply_.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    Mint(_to, _amount);
    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;
    MintFinished();
    return true;
  }
}

// File: zeppelin-solidity/contracts/token/ERC20/CappedToken.sol

/**
 * @title Capped token
 * @dev Mintable token with a token cap.
 */
contract CappedToken is MintableToken {

  uint256 public cap;

  function CappedToken(uint256 _cap) public {
    require(_cap > 0);
    cap = _cap;
  }

  /**
   * @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) onlyOwner canMint public returns (bool) {
    require(totalSupply_.add(_amount) <= cap);

    return super.mint(_to, _amount);
  }

}

// File: zeppelin-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;
    Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    Unpause();
  }
}

// File: zeppelin-solidity/contracts/token/ERC20/PausableToken.sol

/**
 * @title Pausable token
 * @dev StandardToken modified with pausable transfers.
 **/
contract PausableToken is StandardToken, Pausable {

  function transfer(address _to, uint256 _value) public whenNotPaused returns (bool) {
    return super.transfer(_to, _value);
  }

  function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused returns (bool) {
    return super.transferFrom(_from, _to, _value);
  }

  function approve(address _spender, uint256 _value) public whenNotPaused returns (bool) {
    return super.approve(_spender, _value);
  }

  function increaseApproval(address _spender, uint _addedValue) public whenNotPaused returns (bool success) {
    return super.increaseApproval(_spender, _addedValue);
  }

  function decreaseApproval(address _spender, uint _subtractedValue) public whenNotPaused returns (bool success) {
    return super.decreaseApproval(_spender, _subtractedValue);
  }
}

// File: contracts/MeshToken.sol

/**
 * CappedToken token is Mintable token with a max cap on totalSupply that can ever be minted.
 * PausableToken overrides all transfers methods and adds a modifier to check if paused is set to false.
 */
contract MeshToken is CappedToken, PausableToken {
  string public name = "DJANGO UNCHAIN";
  string public symbol = "DJANGO";
  uint256 public decimals = 18;
  uint256 public cap = 129498559 ether;

  /**
   * @dev variable to keep track of what addresses are allowed to call transfer functions when token is paused.
   */
  mapping (address => bool) public allowedTransfers;

  /*------------------------------------constructor------------------------------------*/
  /**
   * @dev constructor for mesh token
   */
  function MeshToken() CappedToken(cap) public {
    paused = true;
  }

  /*------------------------------------overridden methods------------------------------------*/
  /**
   * @dev Overridder modifier to allow exceptions for pausing for a given address
   * This modifier is added to all transfer methods by PausableToken and only allows if paused is set to false.
   * With this override the function allows either if paused is set to false or msg.sender is allowedTransfers during the pause as well.
   */
  modifier whenNotPaused() {
    require(!paused || allowedTransfers[msg.sender]);
    _;
  }

  /**
   * @dev overriding Pausable#pause method to do nothing
   * Paused is set to true in the constructor itself, making the token non-transferrable on deploy.
   * once unpaused the contract cannot be paused again.
   * adding this to limit owner's ability to pause the token in future.
   */
  function pause() onlyOwner whenNotPaused public {}

  /**
   * @dev modifier created to prevent short address attack problems.
   * solution based on this blog post https://blog.coinfabrik.com/smart-contract-short-address-attack-mitigation-failure
   */
  modifier onlyPayloadSize(uint size) {
    assert(msg.data.length >= size + 4);
    _;
  }

  /**
   * @dev overriding transfer method to include the onlyPayloadSize check modifier
   */
  function transfer(address _to, uint256 _value) onlyPayloadSize(2 * 32) public returns (bool) {
    return super.transfer(_to, _value);
  }

  /*------------------------------------new methods------------------------------------*/

  /**
   * @dev method to updated allowedTransfers for an address
   * @param _address that needs to be updated
   * @param _allowedTransfers indicating if transfers are allowed or not
   * @return boolean indicating function success.
   */
  function updateAllowedTransfers(address _address, bool _allowedTransfers)
  external
  onlyOwner
  returns (bool)
  {
    // don't allow owner to change this for themselves
    // otherwise whenNotPaused will not work as expected for owner,
    // therefore prohibiting them from calling pause/unpause.
    require(_address != owner);

    allowedTransfers[_address] = _allowedTransfers;
    return true;
  }
}

// File: zeppelin-solidity/contracts/crowdsale/Crowdsale.sol

/**
 * @title Crowdsale
 * @dev Crowdsale is a base contract for managing a token crowdsale.
 * Crowdsales have a start and end timestamps, where investors can make
 * token purchases and the crowdsale will assign them tokens based
 * on a token per ETH rate. Funds collected are forwarded to a wallet
 * as they arrive. The contract requires a MintableToken that will be
 * minted as contributions arrive, note that the crowdsale contract
 * must be owner of the token in order to be able to mint it.
 */
contract Crowdsale {
  using SafeMath for uint256;

  // The token being sold
  MintableToken public token;

  // start and end timestamps where investments are allowed (both inclusive)
  uint256 public startTime;
  uint256 public endTime;

  // address where funds are collected
  address public wallet;

  // how many token units a buyer gets per wei
  uint256 public rate;

  // amount of raised money in wei
  uint256 public weiRaised;

  /**
   * event for token purchase logging
   * @param purchaser who paid for the tokens
   * @param beneficiary who got the tokens
   * @param value weis paid for purchase
   * @param amount amount of tokens purchased
   */
  event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);


  function Crowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet, MintableToken _token) public {
    require(_startTime >= now);
    require(_endTime >= _startTime);
    require(_rate > 0);
    require(_wallet != address(0));
    require(_token != address(0));

    startTime = _startTime;
    endTime = _endTime;
    rate = _rate;
    wallet = _wallet;
    token = _token;
  }

  // fallback function can be used to buy tokens
  function () external payable {
    buyTokens(msg.sender);
  }

  // low level token purchase function
  function buyTokens(address beneficiary) public payable {
    require(beneficiary != address(0));
    require(validPurchase());

    uint256 weiAmount = msg.value;

    // calculate token amount to be created
    uint256 tokens = getTokenAmount(weiAmount);

    // update state
    weiRaised = weiRaised.add(weiAmount);

    token.mint(beneficiary, tokens);
    TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);

    forwardFunds();
  }

  // @return true if crowdsale event has ended
  function hasEnded() public view returns (bool) {
    return now > endTime;
  }

  // Override this method to have a way to add business logic to your crowdsale when buying
  function getTokenAmount(uint256 weiAmount) internal view returns(uint256) {
    return weiAmount.mul(rate);
  }

  // send ether to the fund collection wallet
  // override to create custom fund forwarding mechanisms
  function forwardFunds() internal {
    wallet.transfer(msg.value);
  }

  // @return true if the transaction can buy tokens
  function validPurchase() internal view returns (bool) {
    bool withinPeriod = now >= startTime && now <= endTime;
    bool nonZeroPurchase = msg.value != 0;
    return withinPeriod && nonZeroPurchase;
  }

}

// File: zeppelin-solidity/contracts/crowdsale/CappedCrowdsale.sol

/**
 * @title CappedCrowdsale
 * @dev Extension of Crowdsale with a max amount of funds raised
 */
contract CappedCrowdsale is Crowdsale {
  using SafeMath for uint256;

  uint256 public cap;

  function CappedCrowdsale(uint256 _cap) public {
    require(_cap > 0);
    cap = _cap;
  }

  // overriding Crowdsale#hasEnded to add cap logic
  // @return true if crowdsale event has ended
  function hasEnded() public view returns (bool) {
    bool capReached = weiRaised >= cap;
    return capReached || super.hasEnded();
  }

  // overriding Crowdsale#validPurchase to add extra cap logic
  // @return true if investors can buy at the moment
  function validPurchase() internal view returns (bool) {
    bool withinCap = weiRaised.add(msg.value) <= cap;
    return withinCap && super.validPurchase();
  }

}

// File: contracts/MeshCrowdsale.sol

/**
 * CappedCrowdsale limits the total number of wei that can be collected in the sale.
 */
contract MeshCrowdsale is CappedCrowdsale, Ownable {

  using SafeMath for uint256;

  /**
   * @dev weiLimits keeps track of amount of wei that can be contibuted by an address.
   */
  mapping (address => uint256) public weiLimits;

  /**
   * @dev weiContributions keeps track of amount of wei that are contibuted by an address.
   */
  mapping (address => uint256) public weiContributions;

  /**
   * @dev whitelistingAgents keeps track of who is allowed to call the setLimit method
   */
  mapping (address => bool) public whitelistingAgents;

  /**
   * @dev minimumContribution keeps track of what should be the minimum contribution required per address
   */
  uint256 public minimumContribution;

  /**
   * @dev variable to keep track of beneficiaries for which we need to mint the tokens directly
   */
  address[] public beneficiaries;

  /**
   * @dev variable to keep track of amount of tokens to mint for beneficiaries
   */
  uint256[] public beneficiaryAmounts;

  /**
   * @dev variable to keep track of if predefined tokens have been minted
   */
  bool public mintingFinished;
  /*---------------------------------constructor---------------------------------*/

  /**
   * @dev Constructor for MeshCrowdsale contract
   */
  function MeshCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet, uint256 _cap, uint256 _minimumContribution, MeshToken _token, address[] _beneficiaries, uint256[] _beneficiaryAmounts)
  CappedCrowdsale(_cap)
  Crowdsale(_startTime, _endTime, _rate, _wallet, _token)
  public
  {
    require(_beneficiaries.length == _beneficiaryAmounts.length);
    beneficiaries = _beneficiaries;
    beneficiaryAmounts = _beneficiaryAmounts;
    mintingFinished = false;

    minimumContribution = _minimumContribution;
  }

  /*---------------------------------overridden methods---------------------------------*/

  /**
   * overriding Crowdsale#buyTokens to keep track of wei contributed per address
   */
  function buyTokens(address beneficiary) public payable {
    weiContributions[msg.sender] = weiContributions[msg.sender].add(msg.value);
    super.buyTokens(beneficiary);
  }

  /**
   * overriding CappedCrowdsale#validPurchase to add extra contribution limit logic
   * @return true if investors can buy at the moment
   */
  function validPurchase() internal view returns (bool) {
    bool withinLimit = weiContributions[msg.sender] <= weiLimits[msg.sender];
    bool atleastMinimumContribution = weiContributions[msg.sender] >= minimumContribution;
    return atleastMinimumContribution && withinLimit && super.validPurchase();
  }



  /*---------------------------------new methods---------------------------------*/


  /**
   * @dev Allows owner to add / remove whitelistingAgents
   * @param _address that is being allowed or removed from whitelisting addresses
   * @param _value boolean indicating if address is whitelisting agent or not
   */
  function setWhitelistingAgent(address _address, bool _value) external onlyOwner {
    whitelistingAgents[_address] = _value;
  }

  /**
   * @dev Allows the current owner to update contribution limits
   * @param _addresses whose contribution limits should be changed
   * @param _weiLimit new contribution limit
   */
  function setLimit(address[] _addresses, uint256 _weiLimit) external {
    require(whitelistingAgents[msg.sender] == true);

    for (uint i = 0; i < _addresses.length; i++) {
      address _address = _addresses[i];

      // only allow changing the limit to be greater than current contribution
      if(_weiLimit >= weiContributions[_address]) {
        weiLimits[_address] = _weiLimit;
      }
    }
  }

  /**
   * @dev Allows the current owner to change the ETH to token generation rate.
   * @param _rate indicating the new token generation rate.
   */
  function setRate(uint256 _rate) external onlyOwner {
    // make sure the crowdsale has not started
    require(weiRaised == 0 && now <= startTime);

    // make sure new rate is greater than 0
    require(_rate > 0);

    rate = _rate;
  }


  /**
   * @dev Allows the current owner to change the crowdsale cap.
   * @param _cap indicating the new crowdsale cap.
   */
  function setCap(uint256 _cap) external onlyOwner {
    // make sure the crowdsale has not started
    require(weiRaised == 0 && now <= startTime);

    // make sure new cap is greater than 0
    require(_cap > 0);

    cap = _cap;
  }

  /**
   * @dev Allows the current owner to change the required minimum contribution.
   * @param _minimumContribution indicating the minimum required contribution.
   */
  function setMinimumContribution(uint256 _minimumContribution) external onlyOwner {
    minimumContribution = _minimumContribution;
  }

  /*
   * @dev Function to perform minting to predefined beneficiaries once crowdsale has started
   * can be called by only once and by owner only
   */
  function mintPredefinedTokens() external onlyOwner {
    // prevent owner from minting twice
    require(!mintingFinished);

    // make sure the crowdsale has started
    require(weiRaised > 0);

    // loop through the list and call mint on token directly
    // this minting does not affect any crowdsale numbers
    for (uint i = 0; i < beneficiaries.length; i++) {
      if (beneficiaries[i] != address(0) && token.balanceOf(beneficiaries[i]) == 0) {
        token.mint(beneficiaries[i], beneficiaryAmounts[i]);
      }
    }
    // set it at the end, making sure all transactions have been completed with the gas
    mintingFinished = true;
  }

  /*---------------------------------proxy methods for token when owned by contract---------------------------------*/
  /**
   * @dev Allows the current owner to transfer token control back to contract owner
   */
  function transferTokenOwnership() external onlyOwner {
    token.transferOwnership(owner);
  }
}