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

contract PossumToken {
    string private _name = "Possum Token";
    string private _symbol = "POSS";
    uint8 private _decimals = 18;
    
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    uint256 private _totalSupply;
    
    address private _owner;
    bool private _paused;
    
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Paused(address account);
    event Unpaused(address account);
    
    constructor() {
        _owner = msg.sender;
        _mint(msg.sender, 1000000 * 10**uint256(_decimals));
        _paused = false;
    }
    
    modifier onlyOwner() {
        require(msg.sender == _owner, "ERC20: caller is not the owner");
        _;
    }
    
    modifier whenNotPaused() {
        require(!_paused, "ERC20: token transfer while paused");
        _;
    }
    
    function name() public view returns (string memory) {
        return _name;
    }
    
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    
    function decimals() public view returns (uint8) {
        return _decimals;
    }
    
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }
    
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }
    
    function transfer(address recipient, uint256 amount) public whenNotPaused returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }
    
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }
    
    function approve(address spender, uint256 amount) public whenNotPaused returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }
    
    function transferFrom(address sender, address recipient, uint256 amount) public whenNotPaused returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender] - amount);
        return true;
    }
    
    function increaseAllowance(address spender, uint256 addedValue) public whenNotPaused returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender] + addedValue);
        return true;
    }
    
    function decreaseAllowance(address spender, uint256 subtractedValue) public whenNotPaused returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender] - subtractedValue);
        return true;
    }
    
    function mint(address account, uint256 amount) public onlyOwner returns (bool) {
        _mint(account, amount);
        return true;
    }
    
    function burn(uint256 amount) public {
        _burn(msg.sender, amount);
    }
    
    function pause() public onlyOwner {
        _paused = true;
        emit Paused(msg.sender);
    }
    
    function unpause() public onlyOwner {
        _paused = false;
        emit Unpaused(msg.sender);
    }
    
    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(amount <= _balances[sender], "ERC20: transfer amount exceeds balance");
        
        _balances[sender] -= amount;
        _balances[recipient] += amount;
        
        emit Transfer(sender, recipient, amount);
    }
    
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");
        
        _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(amount <= _balances[account], "ERC20: burn amount exceeds balance");
        
        _balances[account] -= amount;
        _totalSupply -= amount;
        
        emit Transfer(account, address(0), amount);
    }
    
    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
}

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