pragma solidity ^0.4.24;

// 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.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  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: 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: 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
 * 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.
 * 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(_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,
    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;
  }

}

// File: openzeppelin-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/OrigoToken.sol

contract OrigoToken is PausableToken {

    string public constant name = "OrigoToken";
    string public constant symbol = "Origo";
    uint8 public constant decimals = 18;

    uint256 public constant INITIAL_SUPPLY = (10 ** 9) * (10 ** uint256(decimals));

    /**
    * @dev Constructor that gives msg.sender all of existing tokens.
    */
    constructor() public {
        totalSupply_ = INITIAL_SUPPLY;
        balances[msg.sender] = INITIAL_SUPPLY;
        emit Transfer(0x0, msg.sender, INITIAL_SUPPLY);
    }

}

// File: contracts/Whitelist.sol

/**
 * @title Whitelist
 * @dev The Whitelist contract has a whitelist of addresses, and provides basic authorization control functions.
 * @dev This simplifies the implementation of "user permissions".
 */
contract Whitelist is Ownable {
    mapping(address => bool) public whitelist;
    
    event WhitelistedAddressAdded(address addr);
    event WhitelistedAddressRemoved(address addr);

    /**
    * @dev Throws if called by any account that's not whitelisted.
    */
    modifier onlyWhitelisted() {
        require(whitelist[msg.sender]);
        _;
    }

    /**
    * @dev add an address to the whitelist
    * @param addr address
    * @return true if the address was added to the whitelist, false if the address was already in the whitelist 
    */
    function addAddressToWhitelist(address addr) onlyOwner public returns(bool success) {
        if (!whitelist[addr]) {
            whitelist[addr] = true;
            emit WhitelistedAddressAdded(addr);
            success = true; 
        }
    }

    /**
    * @dev add addresses to the whitelist
    * @param addrs addresses
    * @return true if at least one address was added to the whitelist, 
    * false if all addresses were already in the whitelist  
    */
    function addAddressesToWhitelist(address[] addrs) onlyOwner public returns(bool success) {
        for (uint256 i = 0; i < addrs.length; i++) {
            if (addAddressToWhitelist(addrs[i])) {
                success = true;
            }
        }
    }

    /**
    * @dev remove an address from the whitelist
    * @param addr address
    * @return true if the address was removed from the whitelist, 
    * false if the address wasn't in the whitelist in the first place 
    */
    function removeAddressFromWhitelist(address addr) onlyOwner public returns(bool success) {
        if (whitelist[addr]) {
            whitelist[addr] = false;
            emit WhitelistedAddressRemoved(addr);
            success = true;
        }
    }

    /**
    * @dev remove addresses from the whitelist
    * @param addrs addresses
    * @return true if at least one address was removed from the whitelist, 
    * false if all addresses weren't in the whitelist in the first place
    */
    function removeAddressesFromWhitelist(address[] addrs) onlyOwner public returns(bool success) {
        for (uint256 i = 0; i < addrs.length; i++) {
            if (removeAddressFromWhitelist(addrs[i])) {
                success = true;
            }
        }
    }

}

// File: contracts/OrigoTokenSale.sol

contract OrigoTokenSale is Whitelist {
    using SafeMath for uint256;


    bool public depositOpen;
    uint256 public collectTokenPhaseStartTime;

    OrigoToken public token;
    address public wallet;
    uint256 public rate;
    uint256 public minDeposit;
    uint256 public maxDeposit;


    mapping(address => uint256) public depositAmount;

    /**
    * Event for deposit logging
    * @param _depositor who deposited the ETH
    * @param _amount amount of ETH deposited
    */
    event Deposit(address indexed _depositor, uint256 _amount);

    /**
    * 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);

    constructor(
        uint256 _rate,
        address _wallet,
        uint256 _minDeposit,
        uint256 _maxDeposit) public {
        require(_rate > 0);
        require(_wallet != address(0));
        require(_minDeposit >= 0);
        require(_maxDeposit > 0);

        rate = _rate;
        wallet = _wallet;

        minDeposit = _minDeposit;
        maxDeposit = _maxDeposit;
        depositOpen = false;
    }
    function setRate(uint256 _rate) public onlyOwner {
      require(_rate > 0);
      rate = _rate;
    }
    function setToken(ERC20 _token) public onlyOwner  {
      require(_token != address(0));
      token = OrigoToken(_token);
    }
    function setWallet(address _wallet) public onlyOwner {
      require(_wallet != address(0));
      wallet = _wallet;
    }
    function openDeposit() public onlyOwner{
      depositOpen = true;
    }
    function closeDeposit() public onlyOwner{
      depositOpen = false;
    }

    function () external payable {
        deposit();
    }

    function deposit() public payable onlyWhileDepositPhaseOpen onlyWhitelisted {
        address beneficiary = msg.sender;
        uint256 weiAmount = msg.value;
        _preValidatePurchase(beneficiary, weiAmount);

        depositAmount[beneficiary] = depositAmount[beneficiary].add(weiAmount);
        emit Deposit(beneficiary, weiAmount);
    }

    function collectTokens() public onlyAfterCollectTokenPhaseStart {
        _distributeToken(msg.sender);
    }

    function distributeTokens(address _beneficiary) public onlyOwner onlyAfterCollectTokenPhaseStart {
        _distributeToken(_beneficiary);
    }

    function settleDeposit() public onlyOwner  {
        wallet.transfer(address(this).balance);
    }

    function settleExtraToken(address _addr) public onlyOwner  {
        require(token.transfer(_addr, token.balanceOf(this)));
    }

    function setCollectTokenTime(uint256 _collectTokenPhaseStartTime) public onlyOwner  {
        collectTokenPhaseStartTime = _collectTokenPhaseStartTime;
    }

    function getDepositAmount() public view returns (uint256) {
        return depositAmount[msg.sender];
    }

    // -----------------------------------------
    // Internal interface (extensible)
    // -----------------------------------------

    function _distributeToken(address _beneficiary) internal {
        require(_beneficiary != 0);
        uint256 weiAmount = depositAmount[_beneficiary];

        uint256 tokens = weiAmount.mul(rate);

        _processPurchase(_beneficiary, tokens);
        emit TokenPurchase(_beneficiary, _beneficiary, weiAmount, tokens);

        _updatePurchasingState(_beneficiary);
    }

    /**
    * @dev Validation of an incoming purchase. Use require statements to revert state when conditions are not met. Use `super` in contracts that inherit from Crowdsale to extend their validations.
    * Example from CappedCrowdsale.sol's _preValidatePurchase method:
    *   super._preValidatePurchase(_beneficiary, _weiAmount);
    *   require(weiRaised.add(_weiAmount) <= cap);
    * @param _beneficiary Address performing the token purchase
    */
    function _preValidatePurchase(
        address _beneficiary,
        uint256 _weiAmount
    )
        internal view
    {
        require(_beneficiary != address(0));
        require(_weiAmount != 0);
        require(
            depositAmount[_beneficiary].add(_weiAmount) >= minDeposit &&
            depositAmount[_beneficiary].add(_weiAmount) <= maxDeposit);
    }

    /**
    * @dev Source of tokens. Override this method to modify the way in which the crowdsale ultimately gets and sends its tokens.
    * @param _beneficiary Address performing the token purchase
    * @param _tokenAmount Number of tokens to be emitted
    */
    function _deliverTokens(
        address _beneficiary,
        uint256 _tokenAmount
    )
        internal
    {
        require(token.transfer(_beneficiary, _tokenAmount));
    }

    /**
    * @dev Executed when a purchase has been validated and is ready to be executed. Not necessarily emits/sends tokens.
    * @param _beneficiary Address receiving the tokens
    * @param _tokenAmount Number of tokens to be purchased
    */
    function _processPurchase(
        address _beneficiary,
        uint256 _tokenAmount
    )
        internal
    {
        _deliverTokens(_beneficiary, _tokenAmount);
    }

    /**
    * @dev Override for extensions that require an internal state to check for validity (current user contributions, etc.)
    * @param _beneficiary Address receiving the tokens
    */
    function _updatePurchasingState(address _beneficiary) internal {
        require(depositAmount[_beneficiary] > 0);
        depositAmount[_beneficiary] = 0;
    }

    modifier onlyWhileDepositPhaseOpen {
        require(depositOpen);
        _;
    }

    modifier onlyAfterCollectTokenPhaseStart {
        require(token != address(0));
        require(collectTokenPhaseStartTime > 0);
        require(block.timestamp >= collectTokenPhaseStartTime);
        _;
    }
}