// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

pragma solidity >=0.6.2;

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 removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);
    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);
    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapExactETHForTokens(uint256 amountOutMin, address[] calldata path, address to, uint256 deadline)
        external
        payable
        returns (uint256[] memory amounts);
    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    function swapETHForExactTokens(uint256 amountOut, address[] calldata path, address to, uint256 deadline)
        external
        payable
        returns (uint256[] memory amounts);

    function quote(uint256 amountA, uint256 reserveA, uint256 reserveB) external pure returns (uint256 amountB);
    function getAmountOut(uint256 amountIn, uint256 reserveIn, uint256 reserveOut)
        external
        pure
        returns (uint256 amountOut);
    function getAmountIn(uint256 amountOut, uint256 reserveIn, uint256 reserveOut)
        external
        pure
        returns (uint256 amountIn);
    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);
}

pragma solidity >=0.6.2;

import "./IUniswapV2Router01.sol";

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.24;

// Importing required interfaces and contracts
import "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "v2-periphery/interfaces/IUniswapV2Router02.sol";

/**
 * @title SpaceLlamaFund
 * @dev This contract manages the Space Llama Fund, a fund for the Space Llama project.
 */
contract SpaceLlamaFund is Ownable, IERC20 {
    // Uniswap router for token swaps
    IUniswapV2Router02 uniswapV2Router;

    // Name and symbol for the fund token
    string private _name = "Space Llama Fund";
    string private _symbol = "LLAMAF";

    // Index to keep track of the last processed account
    uint256 public lastProcessedIndex;

    // Total supply of the fund token
    uint256 private _totalSupply;
    // Mapping to store the balance of each account
    mapping(address => uint256) private _balances;

    // Constant to magnify the Ether per share to avoid rounding errors
    uint256 private constant magnitude = 2 ** 128;
    // Minimum token balance required to be eligible for SLF
    uint256 public immutable minTokenBalanceForSLF;
    // Magnified Ether per share
    uint256 private magnifiedEtherPerShare;
    // Total Ether distributed and withdrawn
    uint256 public totalEtherDistributed;
    uint256 public totalEtherWithdrawn;

    // Address of the token
    address public tokenAddress;

    // Mappings to store the state of each account
    mapping(address => bool) public excludedFromSLF;
    mapping(address => int256) private magnifiedEtherCorrections;
    mapping(address => uint256) private withdrawnEther;
    mapping(address => uint256) private lastClaimTimes;

    // Events to log various actions
    event EtherDistributed(address indexed from, uint256 weiAmount);
    event EtherWithdrawn(address indexed to, uint256 weiAmount);
    event ExcludeFromSLF(address indexed account, bool excluded);
    event Claim(address indexed account, uint256 amount);

    /**
     * @dev Struct to store account information.
     */
    struct AccountInfo {
        address account;
        uint256 withdrawableEther;
        uint256 totalSLF;
        uint256 lastClaimTime;
    }

    /**
     * @dev Constructor for the SpaceLlamaFund contract.
     * @param _tokenAddress The address of the token.
     * @param _uniswapRouter The address of the Uniswap router.
     */
    constructor(address _tokenAddress, address _uniswapRouter) Ownable(_tokenAddress) {
        // Set the minimum token balance for SLF
        minTokenBalanceForSLF = 1 * (10 ** 18);
        // Set the token and Uniswap router addresses
        tokenAddress = _tokenAddress;
        uniswapV2Router = IUniswapV2Router02(_uniswapRouter);
    }

    /**
     * @dev Fallback function to distribute SLF when Ether is sent to the contract.
     */
    receive() external payable {
        distributeSLF();
    }

    /**
     * @dev Function to distribute SLF.
     */
    function distributeSLF() public payable {
        // Ensure that the total supply is greater than 0
        require(_totalSupply > 0, "Total supply should be greater than 0");
        // If Ether is sent, distribute it among the token holders
        if (msg.value > 0) {
            magnifiedEtherPerShare = magnifiedEtherPerShare + ((msg.value * magnitude) / _totalSupply);
            emit EtherDistributed(msg.sender, msg.value);
            totalEtherDistributed += msg.value;
        }
    }

    /**
     * @dev Function to set the balance of an account.
     * @param account The address of the account.
     * @param newBalance The new balance of the account.
     */
    function setBalance(address payable account, uint256 newBalance) external onlyOwner {
        // If the account is excluded from SLF, do nothing
        if (excludedFromSLF[account]) {
            return;
        }
        // If the new balance is greater than or equal to the minimum token balance for SLF, set the balance
        if (newBalance >= minTokenBalanceForSLF) {
            _setBalance(account, newBalance);
        } else {
            // Otherwise, set the balance to 0
            _setBalance(account, 0);
        }
    }

    /**
     * @dev Function to exclude an account from SLF.
     * @param account The address of the account.
     * @param excluded The boolean value indicating whether the account should be excluded.
     */
    function excludeFromSLF(address account, bool excluded) external onlyOwner {
        // Ensure that the account is not already in the requested state
        require(excludedFromSLF[account] != excluded, "SLF: account already set to requested state");
        // Set the state of the account
        excludedFromSLF[account] = excluded;
        // If the account is excluded, set its balance to 0
        if (excluded) {
            _setBalance(account, 0);
        } else {
            // Otherwise, set its balance to its token balance if it is greater than or equal to the minimum token balance for SLF
            uint256 newBalance = IERC20(tokenAddress).balanceOf(account);
            if (newBalance >= minTokenBalanceForSLF) {
                _setBalance(account, newBalance);
            } else {
                _setBalance(account, 0);
            }
        }
        // Emit an event to log the exclusion
        emit ExcludeFromSLF(account, excluded);
    }

    /**
     * @dev Function to check if an account is excluded from SLF.
     * @param account The address of the account.
     * @return A boolean value indicating whether the account is excluded.
     */
    function isExcludedFromSLF(address account) public view returns (bool) {
        // Return the state of the account
        return excludedFromSLF[account];
    }

    /**
     * @dev Internal function to set the balance of an account.
     * @param account The address of the account.
     * @param newBalance The new balance of the account.
     */
    function _setBalance(address account, uint256 newBalance) internal {
        // Get the current balance of the account
        uint256 currentBalance = _balances[account];
        // If the new balance is greater than the current balance, mint tokens
        if (newBalance > currentBalance) {
            uint256 addAmount = newBalance - currentBalance;
            _mint(account, addAmount);
        } else if (newBalance < currentBalance) {
            // If the new balance is less than the current balance, burn tokens
            uint256 subAmount = currentBalance - newBalance;
            _burn(account, subAmount);
        }
    }

    /**
     * @dev Internal function to mint tokens.
     * @param account The address of the account.
     * @param amount The amount of tokens to mint.
     */
    function _mint(address account, uint256 amount) private {
        // Ensure that the account is not the zero address
        require(account != address(0), "SLF: mint to the zero address");
        // Increase the total supply and the balance of the account
        _totalSupply += amount;
        _balances[account] += amount;
        // Emit a transfer event from the zero address to the account
        emit Transfer(address(0), account, amount);
        // Adjust the magnified Ether correction for the account
        magnifiedEtherCorrections[account] =
            magnifiedEtherCorrections[account] - int256(magnifiedEtherPerShare * amount);
    }

    /**
     * @dev Internal function to burn tokens.
     * @param account The address of the account.
     * @param amount The amount of tokens to burn.
     */
    function _burn(address account, uint256 amount) private {
        // Ensure that the account is not the zero address
        require(account != address(0), "SLF: burn from the zero address");
        // Ensure that the account has enough balance to burn
        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "SLF: burn amount exceeds balance");
        // Decrease the balance of the account and the total supply
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;
        // Emit a transfer event from the account to the zero address
        emit Transfer(account, address(0), amount);
        // Adjust the magnified Ether correction for the account
        magnifiedEtherCorrections[account] =
            magnifiedEtherCorrections[account] + int256(magnifiedEtherPerShare * amount);
    }

    /**
     * @dev Function to process an account.
     * @param account The address of the account.
     * @return A boolean value indicating whether the process was successful.
     */
    function processAccount(address payable account) public onlyOwner returns (bool) {
        // Withdraw the SLF of the user
        uint256 amount = _withdrawSLFOfUser(account);
        // If the amount is greater than 0, update the last claim time and emit a claim event
        if (amount > 0) {
            lastClaimTimes[account] = block.timestamp;
            emit Claim(account, amount);
            return true;
        }
        // If the amount is 0, return false
        return false;
    }

    /**
     * @dev Internal function to withdraw SLF of a user.
     * @param account The address of the account.
     * @return The amount of SLF withdrawn.
     */
    function _withdrawSLFOfUser(address payable account) private returns (uint256) {
        // Get the withdrawable Ether of the account
        uint256 _withdrawableEther = withdrawableEtherOf(account);
        // If the withdrawable Ether is greater than 0, withdraw it
        if (_withdrawableEther > 0) {
            withdrawnEther[account] += _withdrawableEther;
            totalEtherWithdrawn += _withdrawableEther;
            emit EtherWithdrawn(account, _withdrawableEther);
            // Try to transfer the Ether to the account
            (bool success,) = account.call{value: _withdrawableEther, gas: 3000}("");
            // If the transfer fails, revert the withdrawal
            if (!success) {
                withdrawnEther[account] -= _withdrawableEther;
                totalEtherWithdrawn -= _withdrawableEther;
                return 0;
            }
            return _withdrawableEther;
        }
        // If the withdrawable Ether is 0, return 0
        return 0;
    }

    /**
     * @dev Function to get the withdrawable Ether of an account.
     * @param account The address of the account.
     * @return The amount of withdrawable Ether.
     */
    function withdrawableEtherOf(address account) public view returns (uint256) {
        // Return the difference between the accumulative SLF and the withdrawn Ether of the account
        return accumulativeSLFOf(account) - withdrawnEther[account];
    }

    /**
     * @dev Function to get the withdrawn Ether of an account.
     * @param account The address of the account.
     * @return The amount of withdrawn Ether.
     */
    function withdrawnEtherOf(address account) public view returns (uint256) {
        // Return the withdrawn Ether of the account
        return withdrawnEther[account];
    }

    /**
     * @dev Function to get the accumulative SLF of an account.
     * @param account The address of the account.
     * @return The amount of accumulative SLF.
     */
    function accumulativeSLFOf(address account) public view returns (uint256) {
        // Calculate the accumulative SLF of the account
        int256 a = int256(magnifiedEtherPerShare * balanceOf(account));
        int256 b = magnifiedEtherCorrections[account];
        return uint256(a + b) / magnitude;
    }

    /**
     * @dev Function to get the account information of an account.
     * @param account The address of the account.
     * @return The account information.
     */
    function getAccountInfo(address account) public view returns (address, uint256, uint256, uint256, uint256) {
        // Create a memory struct to store the account information
        AccountInfo memory info;
        info.account = account;
        info.withdrawableEther = withdrawableEtherOf(account);
        info.totalSLF = accumulativeSLFOf(account);
        info.lastClaimTime = lastClaimTimes[account];
        // Return the account information
        return (info.account, info.withdrawableEther, info.totalSLF, info.lastClaimTime, totalEtherWithdrawn);
    }

    /**
     * @dev Function to get the last claim time of an account.
     * @param account The address of the account.
     * @return The last claim time.
     */
    function getLastClaimTime(address account) public view returns (uint256) {
        // Return the last claim time of the account
        return lastClaimTimes[account];
    }

    /**
     * @dev Function to get the name of the token.
     * @return The name of the token.
     */
    function name() public view returns (string memory) {
        // Return the name of the token
        return _name;
    }

    /**
     * @dev Function to get the symbol of the token.
     * @return The symbol of the token.
     */
    function symbol() public view returns (string memory) {
        // Return the symbol of the token
        return _symbol;
    }

    /**
     * @dev Function to get the decimals of the token.
     * @return The decimals of the token.
     */
    function decimals() public pure returns (uint8) {
        // Return the decimals of the token
        return 18;
    }

    /**
     * @dev Function to get the total supply of the token.
     * @return The total supply of the token.
     */
    function totalSupply() public view override returns (uint256) {
        // Return the total supply of the token
        return _totalSupply;
    }

    /**
     * @dev Function to get the balance of an account.
     * @param account The address of the account.
     * @return The balance of the account.
     */
    function balanceOf(address account) public view override returns (uint256) {
        // Return the balance of the account
        return _balances[account];
    }

    /**
     * @dev Function to transfer tokens. This function is not allowed and will always revert.
     */
    function transfer(address, uint256) public pure override returns (bool) {
        // Revert the transaction as this function is not allowed
        revert("Not Allowed");
    }

    /**
     * @dev Function to get the allowance of an account. This function is not allowed and will always revert.
     */
    function allowance(address, address) public pure override returns (uint256) {
        // Revert the transaction as this function is not allowed
        revert("Not Allowed");
    }

    /**
     * @dev Function to approve an account. This function is not allowed and will always revert.
     */
    function approve(address, uint256) public pure override returns (bool) {
        // Revert the transaction as this function is not allowed
        revert("Not Allowed");
    }

    /**
     * @dev Function to transfer tokens from one account to another. This function is not allowed and will always revert.
     */
    function transferFrom(address, address, uint256) public pure override returns (bool) {
        // Revert the transaction as this function is not allowed
        revert("Not Allowed");
    }
}

{
  "compilationTarget": {
    "src/SpaceLlamaFund.sol": "SpaceLlamaFund"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [
    ":@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    ":ds-test/=lib/openzeppelin-contracts/lib/forge-std/lib/ds-test/src/",
    ":erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    ":forge-std/=lib/forge-std/src/",
    ":openzeppelin-contracts/=lib/openzeppelin-contracts/",
    ":v2-core/=lib/v2-core/contracts/",
    ":v2-periphery/=lib/v2-periphery/contracts/"
  ]
}