pragma solidity ^0.4.11;



/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal constant 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;
  }

  function sub(uint256 a, uint256 b) internal constant returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

/**
 * @title Math
 * @dev Assorted math operations
 */

library Math {
  function max64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal constant returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal constant returns (uint256) {
    return a < b ? a : b;
  }
}


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) constant returns (uint256);
  function transfer(address to, uint256 value) returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}




/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances. 
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  /**
  * @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) returns (bool) {
    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) constant returns (uint256 balance) {
    return balances[_owner];
  }

}




/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) constant returns (uint256);
  function transferFrom(address from, address to, uint256 value) returns (bool);
  function approve(address spender, uint256 value) returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}




/**
 * @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)) 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 amout of tokens to be transfered
   */
  function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
    var _allowance = allowed[_from][msg.sender];

    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // require (_value <= _allowance);

    balances[_to] = balances[_to].add(_value);
    balances[_from] = balances[_from].sub(_value);
    allowed[_from][msg.sender] = _allowance.sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Aprove the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) returns (bool) {

    // To change the approve amount you first have to reduce the addresses`
    //  allowance to zero by calling `approve(_spender, 0)` if it is not
    //  already 0 to mitigate the race condition described here:
    //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    require((_value == 0) || (allowed[msg.sender][_spender] == 0));

    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 specifing the amount of tokens still avaible for the spender.
   */
  function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
    return allowed[_owner][_spender];
  }

}


/**
 * @title LimitedTransferToken
 * @dev LimitedTransferToken defines the generic interface and the implementation to limit token
 * transferability for different events. It is intended to be used as a base class for other token
 * contracts.
 * LimitedTransferToken has been designed to allow for different limiting factors,
 * this can be achieved by recursively calling super.transferableTokens() until the base class is
 * hit. For example:
 *     function transferableTokens(address holder, uint64 time) constant public returns (uint256) {
 *       return min256(unlockedTokens, super.transferableTokens(holder, time));
 *     }
 * A working example is VestedToken.sol:
 * https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/token/VestedToken.sol
 */

contract LimitedTransferToken is ERC20 {

  /**
   * @dev Checks whether it can transfer or otherwise throws.
   */
  modifier canTransfer(address _sender, uint256 _value) {
   require(_value <= transferableTokens(_sender, uint64(now)));
   _;
  }

  /**
   * @dev Checks modifier and allows transfer if tokens are not locked.
   * @param _to The address that will recieve the tokens.
   * @param _value The amount of tokens to be transferred.
   */
  function transfer(address _to, uint256 _value) canTransfer(msg.sender, _value) returns (bool) {
    return super.transfer(_to, _value);
  }

  /**
  * @dev Checks modifier and allows transfer if tokens are not locked.
  * @param _from The address that will send the tokens.
  * @param _to The address that will recieve the tokens.
  * @param _value The amount of tokens to be transferred.
  */
  function transferFrom(address _from, address _to, uint256 _value) canTransfer(_from, _value) returns (bool) {
    return super.transferFrom(_from, _to, _value);
  }

  /**
   * @dev Default transferable tokens function returns all tokens for a holder (no limit).
   * @dev Overwriting transferableTokens(address holder, uint64 time) is the way to provide the
   * specific logic for limiting token transferability for a holder over time.
   */
  function transferableTokens(address holder, uint64 time) constant public returns (uint256) {
    return balanceOf(holder);
  }
}


/**
 * @title Vested token
 * @dev Tokens that can be vested for a group of addresses.
 */
contract VestedToken is StandardToken, LimitedTransferToken {

  uint256 MAX_GRANTS_PER_ADDRESS = 20;

  struct TokenGrant {
    address granter;     // 20 bytes
    uint256 value;       // 32 bytes
    uint64 cliff;
    uint64 vesting;
    uint64 start;        // 3 * 8 = 24 bytes
    bool revokable;
    bool burnsOnRevoke;  // 2 * 1 = 2 bits? or 2 bytes?
  } // total 78 bytes = 3 sstore per operation (32 per sstore)

  mapping (address => TokenGrant[]) public grants;

  event NewTokenGrant(address indexed from, address indexed to, uint256 value, uint256 grantId);

  /**
   * @dev Grant tokens to a specified address
   * @param _to address The address which the tokens will be granted to.
   * @param _value uint256 The amount of tokens to be granted.
   * @param _start uint64 Time of the beginning of the grant.
   * @param _cliff uint64 Time of the cliff period.
   * @param _vesting uint64 The vesting period.
   */
  function grantVestedTokens(
    address _to,
    uint256 _value,
    uint64 _start,
    uint64 _cliff,
    uint64 _vesting,
    bool _revokable,
    bool _burnsOnRevoke
  ) public {

    // Check for date inconsistencies that may cause unexpected behavior
    require(_cliff >= _start && _vesting >= _cliff);

    require(tokenGrantsCount(_to) < MAX_GRANTS_PER_ADDRESS);   // To prevent a user being spammed and have his balance locked (out of gas attack when calculating vesting).

    uint256 count = grants[_to].push(
                TokenGrant(
                  _revokable ? msg.sender : 0, // avoid storing an extra 20 bytes when it is non-revokable
                  _value,
                  _cliff,
                  _vesting,
                  _start,
                  _revokable,
                  _burnsOnRevoke
                )
              );

    transfer(_to, _value);

    NewTokenGrant(msg.sender, _to, _value, count - 1);
  }

  /**
   * @dev Revoke the grant of tokens of a specifed address.
   * @param _holder The address which will have its tokens revoked.
   * @param _grantId The id of the token grant.
   */
  function revokeTokenGrant(address _holder, uint256 _grantId) public {
    TokenGrant grant = grants[_holder][_grantId];

    require(grant.revokable);
    require(grant.granter == msg.sender); // Only granter can revoke it

    address receiver = grant.burnsOnRevoke ? 0xdead : msg.sender;

    uint256 nonVested = nonVestedTokens(grant, uint64(now));

    // remove grant from array
    delete grants[_holder][_grantId];
    grants[_holder][_grantId] = grants[_holder][grants[_holder].length.sub(1)];
    grants[_holder].length -= 1;

    balances[receiver] = balances[receiver].add(nonVested);
    balances[_holder] = balances[_holder].sub(nonVested);

    Transfer(_holder, receiver, nonVested);
  }


  /**
   * @dev Calculate the total amount of transferable tokens of a holder at a given time
   * @param holder address The address of the holder
   * @param time uint64 The specific time.
   * @return An uint256 representing a holder's total amount of transferable tokens.
   */
  function transferableTokens(address holder, uint64 time) constant public returns (uint256) {
    uint256 grantIndex = tokenGrantsCount(holder);

    if (grantIndex == 0) return super.transferableTokens(holder, time); // shortcut for holder without grants

    // Iterate through all the grants the holder has, and add all non-vested tokens
    uint256 nonVested = 0;
    for (uint256 i = 0; i < grantIndex; i++) {
      nonVested = SafeMath.add(nonVested, nonVestedTokens(grants[holder][i], time));
    }

    // Balance - totalNonVested is the amount of tokens a holder can transfer at any given time
    uint256 vestedTransferable = SafeMath.sub(balanceOf(holder), nonVested);

    // Return the minimum of how many vested can transfer and other value
    // in case there are other limiting transferability factors (default is balanceOf)
    return Math.min256(vestedTransferable, super.transferableTokens(holder, time));
  }

  /**
   * @dev Check the amount of grants that an address has.
   * @param _holder The holder of the grants.
   * @return A uint256 representing the total amount of grants.
   */
  function tokenGrantsCount(address _holder) constant returns (uint256 index) {
    return grants[_holder].length;
  }

  /**
   * @dev Calculate amount of vested tokens at a specifc time.
   * @param tokens uint256 The amount of tokens grantted.
   * @param time uint64 The time to be checked
   * @param start uint64 A time representing the begining of the grant
   * @param cliff uint64 The cliff period.
   * @param vesting uint64 The vesting period.
   * @return An uint256 representing the amount of vested tokensof a specif grant.
   *  transferableTokens
   *   |                         _/--------   vestedTokens rect
   *   |                       _/
   *   |                     _/
   *   |                   _/
   *   |                 _/
   *   |                /
   *   |              .|
   *   |            .  |
   *   |          .    |
   *   |        .      |
   *   |      .        |
   *   |    .          |
   *   +===+===========+---------+----------> time
   *      Start       Clift    Vesting
   */
  function calculateVestedTokens(
    uint256 tokens,
    uint256 time,
    uint256 start,
    uint256 cliff,
    uint256 vesting) constant returns (uint256)
    {
      // Shortcuts for before cliff and after vesting cases.
      if (time < cliff) return 0;
      if (time >= vesting) return tokens;

      // Interpolate all vested tokens.
      // As before cliff the shortcut returns 0, we can use just calculate a value
      // in the vesting rect (as shown in above's figure)

      // vestedTokens = tokens * (time - start) / (vesting - start)
      uint256 vestedTokens = SafeMath.div(
                                    SafeMath.mul(
                                      tokens,
                                      SafeMath.sub(time, start)
                                      ),
                                    SafeMath.sub(vesting, start)
                                    );

      return vestedTokens;
  }

  /**
   * @dev Get all information about a specifc grant.
   * @param _holder The address which will have its tokens revoked.
   * @param _grantId The id of the token grant.
   * @return Returns all the values that represent a TokenGrant(address, value, start, cliff,
   * revokability, burnsOnRevoke, and vesting) plus the vested value at the current time.
   */
  function tokenGrant(address _holder, uint256 _grantId) constant returns (address granter, uint256 value, uint256 vested, uint64 start, uint64 cliff, uint64 vesting, bool revokable, bool burnsOnRevoke) {
    TokenGrant grant = grants[_holder][_grantId];

    granter = grant.granter;
    value = grant.value;
    start = grant.start;
    cliff = grant.cliff;
    vesting = grant.vesting;
    revokable = grant.revokable;
    burnsOnRevoke = grant.burnsOnRevoke;

    vested = vestedTokens(grant, uint64(now));
  }

  /**
   * @dev Get the amount of vested tokens at a specific time.
   * @param grant TokenGrant The grant to be checked.
   * @param time The time to be checked
   * @return An uint256 representing the amount of vested tokens of a specific grant at a specific time.
   */
  function vestedTokens(TokenGrant grant, uint64 time) private constant returns (uint256) {
    return calculateVestedTokens(
      grant.value,
      uint256(time),
      uint256(grant.start),
      uint256(grant.cliff),
      uint256(grant.vesting)
    );
  }

  /**
   * @dev Calculate the amount of non vested tokens at a specific time.
   * @param grant TokenGrant The grant to be checked.
   * @param time uint64 The time to be checked
   * @return An uint256 representing the amount of non vested tokens of a specifc grant on the
   * passed time frame.
   */
  function nonVestedTokens(TokenGrant grant, uint64 time) private constant returns (uint256) {
    return grant.value.sub(vestedTokens(grant, time));
  }

  /**
   * @dev Calculate the date when the holder can trasfer all its tokens
   * @param holder address The address of the holder
   * @return An uint256 representing the date of the last transferable tokens.
   */
  function lastTokenIsTransferableDate(address holder) constant public returns (uint64 date) {
    date = uint64(now);
    uint256 grantIndex = grants[holder].length;
    for (uint256 i = 0; i < grantIndex; i++) {
      date = Math.max64(grants[holder][i].vesting, date);
    }
  }
}


contract EGLToken is VestedToken {
  //FIELDS
  string public name = "eGold";
  string public symbol = "EGL";
  uint public decimals = 4;
  
  //CONSTANTS
  // Time limits
  uint public constant STAGE_ONE_TIME_END = 24 hours; // first day bonus
  uint public constant STAGE_TWO_TIME_END = 1 weeks; // first week bonus
  uint public constant STAGE_THREE_TIME_END = 28 days; // around one month
  
  // Multiplier for the decimals
  uint private constant MULTIPLIER = 10000;

  //Prices of EGL
  uint public constant PRICE_STANDARD    =  888 *MULTIPLIER; // EGL received per one ETH; MAX_SUPPLY / (valuation / ethPrice)
  uint public constant PRICE_PREBUY      = 1066 *MULTIPLIER; // 1ETH = 20% more EGL 
  uint public constant PRICE_STAGE_ONE   = 1021 *MULTIPLIER; // 1ETH = 15% more EGL
  uint public constant PRICE_STAGE_TWO   =  976 *MULTIPLIER; // 1ETH = 10% more EGL
  uint public constant PRICE_STAGE_THREE =  888 *MULTIPLIER;

  // EGL Token Limits
  uint public constant ALLOC_TEAM =          4444444 *MULTIPLIER; // team + advisors + everything else
  uint public constant ALLOC_CROWDSALE =    (4444444-266666) *MULTIPLIER;
  uint public constant ALLOC_SC = 	          266666 *MULTIPLIER;
  
  uint public constant ALLOC_MAX_PRE =        888888 *MULTIPLIER;
  
  // More ERC20
  uint public totalSupply =                  8888888 *MULTIPLIER; 
  
  // ASSIGNED IN INITIALIZATION
  // Start and end times
  uint public publicStartTime; // Time in seconds public crowd fund starts.
  uint public publicEndTime; // Time in seconds crowdsale ends
  uint public hardcapInWei;

  //Special Addresses
  address public multisigAddress; // Address to which all ether flows.
  address public ownerAddress; // Address of the contract owner. Can halt the crowdsale.

  // Running totals
  uint public weiRaised; // Total Ether raised.
  uint public EGLSold; // Total EGL sold. Not to exceed ALLOC_CROWDSALE
  uint public prebuyPortionTotal; // Total of Tokens purchased by pre-buy. Not to exceed ALLOC_MAX_PRE.
  
  // booleans
  bool public halted; // halts the crowd sale if true.

  // Is completed
  function isCrowdfundCompleted()
    internal
    returns (bool) 
  {
    if (
      now > publicEndTime
      || EGLSold >= ALLOC_CROWDSALE
      || weiRaised >= hardcapInWei
    ) return true;

    return false;
  }

  // MODIFIERS

  //May only be called by the owner address
  modifier only_owner() {
    require(msg.sender == ownerAddress);
    _;
  }

  //May only be called if the crowdfund has not been halted
  modifier is_not_halted() {
    require(!halted);
    _;
  }

  // EVENTS
  event Buy(address indexed _recipient, uint _amount);

  // Initialization contract assigns address of crowdfund contract and end time.
  function EGLToken(
    address _multisig,
    uint _publicStartTime,
    uint _hardcapInWei
  ) {
    ownerAddress = msg.sender;
    publicStartTime = _publicStartTime;
    publicEndTime = _publicStartTime + 28 days;
    multisigAddress = _multisig;

    hardcapInWei = _hardcapInWei;
    
    balances[0x8c6a58B551F38d4D51C0db7bb8b7ad29f7488702] += ALLOC_SC;

    // will be transferred to the team address when it's vested
    balances[ownerAddress] += ALLOC_TEAM;

    balances[ownerAddress] += ALLOC_CROWDSALE;
  }

  // Transfer amount of tokens from sender account to recipient.
  // Only callable after the crowd fund is completed
  function transfer(address _to, uint _value)
    returns (bool)
  {
    if (_to == msg.sender) return; // no-op, allow even during crowdsale, in order to work around using grantVestedTokens() while in crowdsale
    require(isCrowdfundCompleted());
    return super.transfer(_to, _value);
  }

  // Transfer amount of tokens from a specified address to a recipient.
  function transferFrom(address _from, address _to, uint _value)
    returns (bool)
  {
    require(isCrowdfundCompleted());
    return super.transferFrom(_from, _to, _value);
  }

  // function returns the current EGL price.
  function getPriceRate()
      constant
      returns (uint o_rate)
  {
      uint delta = SafeMath.sub(now, publicStartTime);

      if (delta > STAGE_TWO_TIME_END) return PRICE_STAGE_THREE;
      if (delta > STAGE_ONE_TIME_END) return PRICE_STAGE_TWO;

      return (PRICE_STAGE_ONE);
  }

  // calculates wmount of EGL we get, given the wei and the rates we've defined per 1 eth
  function calcAmount(uint _wei, uint _rate) 
    constant
    returns (uint) 
  {
    return SafeMath.div(SafeMath.mul(_wei, _rate), 1 ether);
  } 
  
  // Given the rate of a purchase and the remaining tokens in this tranche, it
  // will throw if the sale would take it past the limit of the tranche.
  // Returns `amount` in scope as the number of EGL tokens that it will purchase.
  function processPurchase(uint _rate, uint _remaining)
    internal
    returns (uint o_amount)
  {
    o_amount = calcAmount(msg.value, _rate);

    require(o_amount <= _remaining);
    require(multisigAddress.send(msg.value));

    balances[ownerAddress] = balances[ownerAddress].sub(o_amount);
    balances[msg.sender] = balances[msg.sender].add(o_amount);

    EGLSold += o_amount;
    weiRaised += msg.value;
  }

  // Default function called by sending Ether to this address with no arguments.
  // Results in creation of new EGL Tokens if transaction would not exceed hard limit of EGL Token.
  function()
    payable
    is_not_halted
  {
    require(!isCrowdfundCompleted());

    uint amount;

    if (now < publicStartTime) {
      // pre-sale
      amount = processPurchase(PRICE_PREBUY, SafeMath.sub(ALLOC_MAX_PRE, prebuyPortionTotal));
      prebuyPortionTotal += amount;
    } else {
      amount = processPurchase(getPriceRate(), SafeMath.sub(ALLOC_CROWDSALE, EGLSold));
    }
    
    Buy(msg.sender, amount);
  }

  // May be used by owner of contract to halt crowdsale and no longer except ether.
  function toggleHalt(bool _halted)
    only_owner
  {
    halted = _halted;
  }

  // failsafe drain
  function drain()
    only_owner
  {
    require(ownerAddress.send(this.balance));
  }

  // public constant 
  function getStatus() 
    constant
    public
    returns (string)
  {
    if (EGLSold >= ALLOC_CROWDSALE) return "tokensSoldOut";
    if (weiRaised >= hardcapInWei) return "hardcapReached";
    
    if (now < publicStartTime) {
      // presale
      if (prebuyPortionTotal >= ALLOC_MAX_PRE) return "presaleSoldOut";
      return "presale";
    } else if (now < publicEndTime) {
      // public sale
      return "public";
    } else {
      return "saleOver";
    }
  }
}