pragma solidity ^0.4.15;


/**
* @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;
}
}

contract ERC20 {
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);
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);
}

contract BasicToken is ERC20 {
using SafeMath for uint256;

mapping(address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;
modifier nonZeroEth(uint _value) {
require(_value > 0);
_;
}

modifier onlyPayloadSize() {
require(msg.data.length >= 68);
_;
}
/**
* @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) nonZeroEth(_value) onlyPayloadSize returns (bool) {
if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]){
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}else{
return false;
}
}

/**
* @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) nonZeroEth(_value) onlyPayloadSize returns (bool) {
if(balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]){
uint256 _allowance = allowed[_from][msg.sender];
allowed[_from][msg.sender] = _allowance.sub(_value);
balances[_to] = balances[_to].add(_value);
balances[_from] = balances[_from].sub(_value);
Transfer(_from, _to, _value);
return true;
}else{
return false;
}
}


/**
* @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];
}

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];
}

}


contract RPTToken is BasicToken {

using SafeMath for uint256;

string public name = "RPT Token"; //name of the token
string public symbol = "RPT"; // symbol of the token
uint8 public decimals = 18; // decimals
uint256 public totalSupply = 100000000 * 10**18; // total supply of RPT Tokens

// variables
uint256 public keyEmployeeAllocation; // fund allocated to key employee
uint256 public totalAllocatedTokens; // variable to regulate the funds allocation
uint256 public tokensAllocatedToCrowdFund; // funds allocated to crowdfund

// addresses
address public founderMultiSigAddress = 0xf96E905091d38ca25e06C014fE67b5CA939eE83D; // multi sign address of founders which hold
address public crowdFundAddress; // address of crowdfund contract

//events
event ChangeFoundersWalletAddress(uint256 _blockTimeStamp, address indexed _foundersWalletAddress);
event TransferPreAllocatedFunds(uint256 _blockTimeStamp , address _to , uint256 _value);

//modifiers
modifier onlyCrowdFundAddress() {
require(msg.sender == crowdFundAddress);
_;
}

modifier nonZeroAddress(address _to) {
require(_to != 0x0);
_;
}

modifier onlyFounders() {
require(msg.sender == founderMultiSigAddress);
_;
}

// creation of the token contract
function RPTToken (address _crowdFundAddress) {
crowdFundAddress = _crowdFundAddress;

// Token Distribution
tokensAllocatedToCrowdFund = 70 * 10 ** 24; // 70 % allocation of totalSupply
keyEmployeeAllocation = 30 * 10 ** 24; // 30 % allocation of totalSupply

// Assigned balances to respective stakeholders
balances[founderMultiSigAddress] = keyEmployeeAllocation;
balances[crowdFundAddress] = tokensAllocatedToCrowdFund;

totalAllocatedTokens = balances[founderMultiSigAddress];
}

// function to keep track of the total token allocation
function changeTotalSupply(uint256 _amount) onlyCrowdFundAddress {
totalAllocatedTokens = totalAllocatedTokens.add(_amount);
}

// function to change founder multisig wallet address
function changeFounderMultiSigAddress(address _newFounderMultiSigAddress) onlyFounders nonZeroAddress(_newFounderMultiSigAddress) {
founderMultiSigAddress = _newFounderMultiSigAddress;
ChangeFoundersWalletAddress(now, founderMultiSigAddress);
}

}


contract RPTCrowdsale {

using SafeMath for uint256;
RPTToken public token; // Token variable
//variables
uint256 public totalWeiRaised; // Flag to track the amount raised
uint32 public exchangeRate = 3000; // calculated using priceOfEtherInUSD/priceOfRPTToken
uint256 public preDistriToAcquiantancesStartTime = 1510876801; // Friday, 17-Nov-17 00:00:01 UTC
uint256 public preDistriToAcquiantancesEndTime = 1511827199; // Monday, 27-Nov-17 23:59:59 UTC
uint256 public presaleStartTime = 1511827200; // Tuesday, 28-Nov-17 00:00:00 UTC
uint256 public presaleEndTime = 1513036799; // Monday, 11-Dec-17 23:59:59 UTC
uint256 public crowdfundStartTime = 1513036800; // Tuesday, 12-Dec-17 00:00:00 UTC
uint256 public crowdfundEndTime = 1515628799; // Wednesday, 10-Jan-18 23:59:59 UTC
bool internal isTokenDeployed = false; // Flag to track the token deployment
// addresses
address public founderMultiSigAddress; // Founders multi sign address
address public remainingTokenHolder; // Address to hold the remaining tokens after crowdfund end
address public beneficiaryAddress; // All funds are transferred to this address

enum State { Acquiantances, PreSale, CrowdFund, Closed }

//events
event TokenPurchase(address indexed beneficiary, uint256 value, uint256 amount);
event CrowdFundClosed(uint256 _blockTimeStamp);
event ChangeFoundersWalletAddress(uint256 _blockTimeStamp, address indexed _foundersWalletAddress);
//Modifiers
modifier tokenIsDeployed() {
require(isTokenDeployed == true);
_;
}
modifier nonZeroEth() {
require(msg.value > 0);
_;
}

modifier nonZeroAddress(address _to) {
require(_to != 0x0);
_;
}

modifier onlyFounders() {
require(msg.sender == founderMultiSigAddress);
_;
}

modifier onlyPublic() {
require(msg.sender != founderMultiSigAddress);
_;
}

modifier inState(State state) {
require(getState() == state);
_;
}

modifier inBetween() {
require(now >= preDistriToAcquiantancesStartTime && now <= crowdfundEndTime);
_;
}

// Constructor to initialize the local variables
function RPTCrowdsale (address _founderWalletAddress, address _remainingTokenHolder, address _beneficiaryAddress) {
founderMultiSigAddress = _founderWalletAddress;
remainingTokenHolder = _remainingTokenHolder;
beneficiaryAddress = _beneficiaryAddress;
}

// Function to change the founders multi sign address
function setFounderMultiSigAddress(address _newFounderAddress) onlyFounders nonZeroAddress(_newFounderAddress) {
founderMultiSigAddress = _newFounderAddress;
ChangeFoundersWalletAddress(now, founderMultiSigAddress);
}
// Attach the token contract
function setTokenAddress(address _tokenAddress) external onlyFounders nonZeroAddress(_tokenAddress) {
require(isTokenDeployed == false);
token = RPTToken(_tokenAddress);
isTokenDeployed = true;
}


// function call after crowdFundEndTime it transfers the remaining tokens to remainingTokenHolder address
function endCrowdfund() onlyFounders returns (bool) {
require(now > crowdfundEndTime);
uint256 remainingToken = token.balanceOf(this); // remaining tokens

if (remainingToken != 0) {
token.transfer(remainingTokenHolder, remainingToken);
CrowdFundClosed(now);
return true;
} else {
CrowdFundClosed(now);
return false;
}
}

// Buy token function call only in duration of crowdfund active
function buyTokens(address beneficiary)
nonZeroEth
tokenIsDeployed
onlyPublic
nonZeroAddress(beneficiary)
inBetween
payable
public
returns(bool)
{
fundTransfer(msg.value);

uint256 amount = getNoOfTokens(exchangeRate, msg.value);
if (token.transfer(beneficiary, amount)) {
token.changeTotalSupply(amount);
totalWeiRaised = totalWeiRaised.add(msg.value);
TokenPurchase(beneficiary, msg.value, amount);
return true;
}
return false;
}


// function to transfer the funds to founders account
function fundTransfer(uint256 weiAmount) internal {
beneficiaryAddress.transfer(weiAmount);
}

// Get functions

// function to get the current state of the crowdsale
function getState() internal constant returns(State) {
if (now >= preDistriToAcquiantancesStartTime && now <= preDistriToAcquiantancesEndTime) {
return State.Acquiantances;
} if (now >= presaleStartTime && now <= presaleEndTime) {
return State.PreSale;
} if (now >= crowdfundStartTime && now <= crowdfundEndTime) {
return State.CrowdFund;
} else {
return State.Closed;
}
}


// function to calculate the total no of tokens with bonus multiplication
function getNoOfTokens(uint32 _exchangeRate, uint256 _amount) internal returns (uint256) {
uint256 noOfToken = _amount.mul(uint256(_exchangeRate));
uint256 noOfTokenWithBonus = ((uint256(100 + getCurrentBonusRate())).mul(noOfToken)).div(100);
return noOfTokenWithBonus;
}


// function provide the current bonus rate
function getCurrentBonusRate() internal returns (uint8) {
if (getState() == State.Acquiantances) {
return 40;
}
if (getState() == State.PreSale) {
return 20;
}
if (getState() == State.CrowdFund) {
return 0;
} else {
return 0;
}
}

// provides the bonus %
function getBonus() constant returns (uint8) {
return getCurrentBonusRate();
}

// send ether to the contract address
// With at least 200 000 gas
function() public payable {
buyTokens(msg.sender);
}
}