// File: src/FusePool.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import "openzeppelin-contracts/access/Ownable.sol";
import "openzeppelin-contracts/token/ERC20/IERC20.sol";
import "./interfaces/IUniswap.sol";
import "./interfaces/INetwork.sol";
import "./Types.sol";

/**
 * Amplifi
 * Website: https://perpetualyield.io/
 * Telegram: https://t.me/Amplifi_ERC
 * Twitter: https://twitter.com/amplifidefi
 */
contract FusePool is INetwork, Ownable {
    address immutable token;
    uint256 immutable duration;

    address[] shareholders;
    mapping(address => uint256) shareholderIndexes;
    mapping(address => uint256) shareholderClaims;
    mapping(address => uint256) public totalRewardsToUser;
    mapping(address => Types.Share) public shares;
    uint256 public totalShares;
    uint256 public totalDividends;
    uint256 public totalDistributed;
    uint256 public dividendsPerShare;
    uint256 public dividendsPerShareAccuracyFactor = 10**36;

    modifier onlyToken() {
        require(msg.sender == token);
        _;
    }

    constructor(address _owner, uint256 _duration) {
        _transferOwnership(_owner);

        token = msg.sender;
        duration = _duration;
    }

    function increaseShare(address _shareholder, uint256 _unlocks) external override onlyToken {
        if (shares[_shareholder].amount == 0) {
            addShareholder(_shareholder);
        }

        totalShares++;
        shares[_shareholder].amount++;
        shares[_shareholder].unlocks = _unlocks;
        shares[_shareholder].started = block.timestamp;
        shares[_shareholder].totalExcluded = getCumulativeDividends(
            shares[_shareholder].amount,
            shares[_shareholder].started,
            shares[_shareholder].unlocks
        );
        assert(shares[_shareholder].totalExcluded == 0);
    }

    function decreaseShare(address _shareholder) external override onlyToken {
        if (shares[_shareholder].amount == 1) {
            removeShareholder(_shareholder);
        }

        totalShares--;
        shares[_shareholder].totalExcluded = getCumulativeDividends(
            shares[_shareholder].amount,
            shares[_shareholder].started,
            shares[_shareholder].started
        );
        shares[_shareholder].amount--;
        shares[_shareholder].started = 0;
        shares[_shareholder].unlocks = 0;
    }

    function deposit() external payable override onlyOwner {
        uint256 amount = msg.value;
        totalDividends += amount;
        dividendsPerShare += (dividendsPerShareAccuracyFactor * amount) / totalShares;
    }

    function distributeDividend(address _shareholder) external onlyToken {
        uint256 amount = getPendingDividend(_shareholder);

        if (amount > 0) {
            shares[_shareholder].totalExcluded = getCumulativeDividends(
                shares[_shareholder].amount,
                shares[_shareholder].started,
                shares[_shareholder].unlocks
            );
            shares[_shareholder].totalRealised += amount;
            totalDistributed += amount;

            (bool success, ) = _shareholder.call{value: amount}("");
            require(success, "Could not send ETH");

            totalRewardsToUser[_shareholder] = totalRewardsToUser[_shareholder] + amount;
        }
    }

    function getPendingDividend(address _shareholder) public view returns (uint256) {
        if (shares[_shareholder].amount == 0) {
            return 0;
        }

        uint256 shareholderTotalDividends = getCumulativeDividends(
            shares[_shareholder].amount,
            shares[_shareholder].started,
            shares[_shareholder].unlocks
        );
        uint256 shareholderTotalExcluded = shares[_shareholder].totalExcluded;
        if (shareholderTotalDividends <= shareholderTotalExcluded) {
            return 0;
        }

        return shareholderTotalDividends - shareholderTotalExcluded;
    }

    function getCumulativeDividends(
        uint256 share,
        uint256 started,
        uint256 unlocks
    ) internal view returns (uint256) {
        if (unlocks > block.timestamp) {
            unlocks = block.timestamp;
        }

        uint256 total = (share * dividendsPerShare) / dividendsPerShareAccuracyFactor;

        uint256 end = started + duration;
        uint256 endAbs = end - started;
        uint256 nowAbs = unlocks - started;

        return (total * nowAbs) / endAbs;
    }

    function addShareholder(address shareholder) internal {
        shareholderIndexes[shareholder] = shareholders.length;
        shareholders.push(shareholder);
    }

    function removeShareholder(address shareholder) internal {
        shareholders[shareholderIndexes[shareholder]] = shareholders[shareholders.length - 1];
        shareholderIndexes[shareholders[shareholders.length - 1]] = shareholderIndexes[shareholder];
        shareholders.pop();
    }

    function withdrawETH(address _recipient) external onlyOwner {
        (bool success, ) = _recipient.call{value: address(this).balance}("");
        require(success, "Could not send ETH");
    }

    function withdrawToken(IERC20 _token, address _recipient) external onlyOwner {
        _token.transfer(_recipient, _token.balanceOf(address(this)));
    }
}

// File: lib/openzeppelin-contracts/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// File: src/interfaces/IUniswap.sol



// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.13;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to) external returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

interface IUniswapV2Router01 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path) external view returns (uint256[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;
}

// File: src/interfaces/INetwork.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface INetwork {
    function increaseShare(address _shareholder, uint256 _unlocks) external;

    function decreaseShare(address _shareholder) external;

    function deposit() external payable;

    function distributeDividend(address _shareholder) external;
}

// File: src/Types.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

library Types {
    struct FeeRecipients {
        address operations;
        address validatorAcquisition;
        address PCR;
        address yield;
        address xChainValidatorAcquisition;
        address indexFundPools;
        address gAMPRewardsPool;
        address OTCSwap;
        address rescueFund;
        address protocolImprovement;
        address developers;
    }

    struct Fees {
        uint16 operations;
        uint16 validatorAcquisition;
        uint16 PCR;
        uint16 yield;
        uint16 xChainValidatorAcquisition;
        uint16 indexFundPools;
        uint16 gAMPRewardsPool;
        uint16 OTCSwap;
        uint16 rescueFund;
        uint16 protocolImprovement;
        uint16 developers;
    }

    struct Share {
        uint256 amount;
        uint256 totalExcluded;
        uint256 totalRealised;
        uint256 started;
        uint256 unlocks;
    }

    enum FuseProduct {
        None,
        OneYear,
        ThreeYears,
        FiveYears
    }

    struct Amplifier {
        FuseProduct fuseProduct;
        address minter;
        uint256 created;
        uint256 expires;
        uint256 numClaims;
        uint256 lastClaimed;
        uint256 fused;
        uint256 unlocks;
        uint256 lastFuseClaimed;
    }

    struct AmplifierFeeRecipients {
        address operations;
        address validatorAcquisition;
        address developers;
    }
}

// File: lib/openzeppelin-contracts/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

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;
    }
}