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

interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function increaseAllowance(address spender, uint256 addedValue) external returns (bool);
function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);

event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract ReflectionToken is IERC20 {
string public name = "Reflection Token";
string public symbol = "RFT";
uint8 public decimals = 18;

uint256 private constant MAX = ~uint256(0);
uint256 private constant INITIAL_SUPPLY = 1_000_000_000 * 10**18; // 1 billion tokens

mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;

uint256 private _totalSupply;
uint256 private _reflectionTotal;
mapping (address => uint256) private _reflectionBalance;
mapping (address => bool) private _isExcludedFromReflection;

uint256 public taxRate = 5; // 5% tax rate on each transaction
uint256 private _reflectionTaxRate = 5; // 5% reflection tax rate on each transaction
uint256 private constant _MAX_TAX_RATE = 100; // Maximum tax rate

constructor() {
_totalSupply = INITIAL_SUPPLY;
_balances[msg.sender] = _totalSupply;

_reflectionTotal = (MAX - (MAX % _totalSupply));
_reflectionBalance[msg.sender] = _reflectionTotal;

emit Transfer(address(0), msg.sender, _totalSupply);
}

function totalSupply() external view override returns (uint256) {
return _totalSupply;
}

function balanceOf(address account) external view override returns (uint256) {
if (_isExcludedFromReflection[account]) {
return _balances[account];
}
return tokenFromReflection(_reflectionBalance[account]);
}

function transfer(address recipient, uint256 amount) external override returns (bool) {
_transfer(msg.sender, recipient, amount);
return true;
}

function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
_transfer(sender, recipient, amount);

uint256 currentAllowance = _allowances[sender][msg.sender];
require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
_approve(sender, msg.sender, currentAllowance - amount);

return true;
}

function allowance(address owner, address spender) external view override returns (uint256) {
return _allowances[owner][spender];
}