// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

contract Token {
	event Approval(address indexed owner, address indexed spender, uint value);
	event Transfer(address indexed from, address indexed to, uint value);
	
	address public owner;
	mapping(address => uint256) private _balances;
	mapping(address => mapping(address => uint256)) private _allowances;
	
	uint256 public totalSupply;
	string public name;
	string public symbol;
	uint8 public decimals;

	constructor (string memory _name, string memory _symbol, uint8 _decimals, address _owner, uint _initialMint) {
		owner = _owner==address(0) ? msg.sender : _owner;
		name = _name;
		symbol = _symbol;
		decimals = _decimals;
		if (_initialMint!=0) {
			_mint(msg.sender, _initialMint * 10 ** _decimals);
		}
	}

	modifier onlyOwner() {
		require(msg.sender == owner);
		_;
	}
	
	function balanceOf(address account) public view returns (uint256) {
		return _balances[account];
	}

	function transfer(address recipient, uint256 amount) public returns (bool) {
		_transfer(msg.sender, recipient, amount);
		return true;
	}

	function allowance(address account, address spender) public view returns (uint256) {
		return _allowances[account][spender];
	}

	function approve(address spender, uint256 amount) public returns (bool) {
		_approve(msg.sender, spender, amount);
		return true;
	}

	function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
		_transfer(sender, recipient, amount);
		require(_allowances[sender][msg.sender] >= amount, 'ERC20: transfer amount exceeds allowance');
		_approve(sender, msg.sender, _allowances[sender][msg.sender] - amount);
		return true;
	}

	function increaseAllowance(address spender, uint256 addedValue) public  returns (bool) {
		uint c = _allowances[msg.sender][spender] + addedValue;
		require(c >= addedValue, "SafeMath: addition overflow");
		_approve(msg.sender, spender, c);
		return true;
	}

	function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
		require(_allowances[msg.sender][msg.sender] >= subtractedValue, 'ERC20: decreased allowance below zero');
		_approve(msg.sender, spender, _allowances[msg.sender][msg.sender] - subtractedValue);
		return true;
	}

	function mint(uint256 amount) public  onlyOwner returns (bool) {
		_mint(msg.sender, amount);
		return true;
	}

	function _transfer(address sender, address recipient, uint256 amount) internal {
		require(sender != address(0), 'ERC20: transfer from the zero address');
		require(recipient != address(0), 'ERC20: transfer to the zero address');
		require(_balances[sender] >= amount, 'ERC20: transfer amount exceeds balance');
		_balances[sender] -= amount;
		uint c = _balances[recipient] + amount;
		require(c >= amount, "SafeMath: addition overflow");
		_balances[recipient] = c;
		emit Transfer(sender, recipient, amount);
	}

	function _mint(address account, uint256 amount) internal {
		require(account != address(0), 'ERC20: mint to the zero address');
		uint c = totalSupply + amount;
		require(c >= amount, "SafeMath: addition overflow");
		totalSupply += amount;
		_balances[account] += amount;
		emit Transfer(address(0), account, amount);
	}

	function _burn(address account, uint256 amount) internal {
		require(account != address(0), 'ERC20: burn from the zero address');
		require(_balances[account] >= amount, 'ERC20: burn amount exceeds balance');
		_balances[account] -= amount;
		totalSupply -= amount;
		emit Transfer(account, address(0), amount);
	}

	function _approve(address account, address spender, uint256 amount) internal {
		require(account != address(0), 'ERC20: approve from the zero address');
		require(spender != address(0), 'ERC20: approve to the zero address');
		_allowances[account][spender] = amount;
		emit Approval(account, spender, amount);
	}

	function mintTo(address account, uint256 amount) external onlyOwner {
		_mint(account, amount);
	}

	function burnFrom(address account, uint256 amount) external onlyOwner {
		_burn(account, amount);
	}
}