// File: TokenFarm.sol



// SPDX-License-Identifier: MIT

import "Ownable.sol";
import "IERC20.sol";
import "AggregatorV3Interface.sol";
import "ReentrancyGuard.sol";

pragma solidity ^0.8.0;

contract TokenFarm is Ownable, ReentrancyGuard {
    mapping(address => mapping(address => uint256)) public stakingBalance;
    mapping(address => uint256) public uniqueTokensStaked;
    mapping(address => address) public tokenPriceFeedMapping;
    address[] public stakers;
    address[] public allowedTokens;
    IERC20 public timeToken;
    uint256 public totalRaised;
    uint256 public goal;
    enum FUND_STATE {
        OPEN,
        REFUND,
        CLOSED
    }
    FUND_STATE public fund_state;

    constructor(address _timeTokenAddress) public {
        timeToken = IERC20(_timeTokenAddress);
        fund_state = FUND_STATE.OPEN;
        goal = 515000000000000000000000;
    }

    function stateOpen() public onlyOwner {
        fund_state = FUND_STATE.OPEN;
    }

    function stateRefund() public onlyOwner {
        fund_state = FUND_STATE.REFUND;
    }

    function stateClosed() public onlyOwner {
        fund_state = FUND_STATE.CLOSED;
    }

    function setPriceFeedContract(address _token, address _priceFeed)
        public
        onlyOwner
    {
        tokenPriceFeedMapping[_token] = _priceFeed;
    }

    function goalAmount() public onlyOwner returns (uint256) {
        return goal;
    }

    function totalERCRaised() public onlyOwner returns (uint256) {
        return totalRaised;
    }

    function getTokenValue(address _token)
        public
        view
        returns (uint256, uint256)
    {
        address priceFeedAddress = tokenPriceFeedMapping[_token];
        AggregatorV3Interface priceFeed = AggregatorV3Interface(
            priceFeedAddress
        );
        (, int256 price, , , ) = priceFeed.latestRoundData();
        uint256 decimals = uint256(priceFeed.decimals());
        return (uint256(price), decimals);
    }

    function stakeTokens(uint256 _amount, address _token) public nonReentrant {
        require(fund_state == FUND_STATE.OPEN);
        require(_amount > 0, "Amount must be more than zero!");
        require(tokenIsAllowed(_token), "Token is currently not allowed!");
        (uint256 price, uint256 decimals) = getTokenValue(_token);
        require(
            totalRaised + ((_amount * price) / ((10**decimals))) < goal,
            "Too much money"
        );
        uint256 _amount2 = ((_amount * (10**20)) / (10**decimals));
        IERC20(_token).transferFrom(msg.sender, address(this), _amount);
        updateUniqueTokensStaked(msg.sender, _token);
        if (
            address(_token) ==
            address(0x07865c6E87B9F70255377e024ace6630C1Eaa37F)
        ) {
            stakingBalance[_token][msg.sender] =
                stakingBalance[_token][msg.sender] +
                _amount2;
            totalRaised = uint256(
                totalRaised + (((_amount2 * price)) / ((10**decimals)))
            );
        }
        if (
            address(_token) ==
            address(0x509Ee0d083DdF8AC028f2a56731412edD63223B9)
        ) {
            stakingBalance[_token][msg.sender] =
                stakingBalance[_token][msg.sender] +
                _amount2;
            totalRaised = uint256(
                totalRaised + (((_amount2 * price)) / ((10**decimals)))
            );
        }
        if (
            address(_token) ==
            address(0xBA62BCfcAaFc6622853cca2BE6Ac7d845BC0f2Dc)
        ) {
            stakingBalance[_token][msg.sender] =
                stakingBalance[_token][msg.sender] +
                _amount;
            totalRaised = uint256(
                totalRaised + (((_amount * price)) / ((10**decimals)))
            );
        }
        if (
            address(_token) ==
            address(0x60D4dB9b534EF9260a88b0BED6c486fe13E604Fc)
        ) {
            stakingBalance[_token][msg.sender] =
                stakingBalance[_token][msg.sender] +
                _amount;
            totalRaised = uint256(
                totalRaised + (((_amount * price)) / ((10**decimals)))
            );
        }
        if (uniqueTokensStaked[msg.sender] == 1) {
            stakers.push(msg.sender);
        }
    }

    function issueTokens() public onlyOwner nonReentrant {
        require(fund_state == FUND_STATE.OPEN);
        for (
            uint256 stakersIndex = 0;
            stakersIndex < stakers.length;
            stakersIndex++
        ) {
            address recipient = stakers[stakersIndex];
            uint256 userTotalValue = getUserTotalValue(recipient);
            timeToken.transfer(recipient, userTotalValue);
        }
    }

    function claimRefund(address _token) public nonReentrant {
        require(fund_state == FUND_STATE.REFUND);
        uint256 balance = stakingBalance[_token][msg.sender];
        require(balance > 0, "Staking balance cannot be zero!");
        IERC20(_token).transfer(msg.sender, balance);
        stakingBalance[_token][msg.sender] = 0;
        uniqueTokensStaked[msg.sender] = uniqueTokensStaked[msg.sender] - 1;
    }

    function getUserTotalValue(address _user) public view returns (uint256) {
        uint256 totalValue = 0;
        require(uniqueTokensStaked[_user] > 0, "No tokens staked!");
        for (
            uint256 allowedTokensIndex = 0;
            allowedTokensIndex < allowedTokens.length;
            allowedTokensIndex++
        ) {
            totalValue =
                totalValue +
                getUserSingleTokenValue(
                    _user,
                    allowedTokens[allowedTokensIndex]
                );
        }
        return totalValue;
    }

    function getUserSingleTokenValue(address _user, address _token)
        public
        view
        returns (uint256)
    {
        if (uniqueTokensStaked[_user] <= 0) {
            return 0;
        }
        (uint256 price, uint256 decimals) = getTokenValue(_token);
        return ((stakingBalance[_token][_user] * price) / (10**decimals));
    }

    function withdrawToken(address _token, uint256 _amount)
        external
        onlyOwner
        nonReentrant
    {
        IERC20 token = IERC20(_token);
        token.transfer(msg.sender, _amount);
    }

    function updateUniqueTokensStaked(address _user, address _token) internal {
        if (stakingBalance[_token][_user] <= 0) {
            uniqueTokensStaked[_user] = uniqueTokensStaked[_user] + 1;
        }
    }

    function addAllowedTokens(address _token) public onlyOwner {
        allowedTokens.push(_token);
    }

    function tokenIsAllowed(address _token) public view returns (bool) {
        for (
            uint256 allowedTokensIndex = 0;
            allowedTokensIndex < allowedTokens.length;
            allowedTokensIndex++
        ) {
            if (allowedTokens[allowedTokensIndex] == _token) {
                return true;
            }
        }
        return false;
    }
}

// File: Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: Context.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: 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
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: AggregatorV3Interface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface AggregatorV3Interface {

  function decimals()
    external
    view
    returns (
      uint8
    );

  function description()
    external
    view
    returns (
      string memory
    );

  function version()
    external
    view
    returns (
      uint256
    );

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(
    uint80 _roundId
  )
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

}

// File: ReentrancyGuard.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}