// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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. 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 {
        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: @openzeppelin/contracts/security/Pausable.sol



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

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (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;
    }

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

// File: contracts/Security.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

contract Security is Ownable, Pausable {
    
    mapping(address => bool) isBlackListed;

    /**
     * @dev Pauses the contract.
     */
    function pause() public onlyOwner {
        _pause();
    }

    /**
     * @dev Unpause the contract.
     */
    function unpause() public onlyOwner {
        _unpause();
    }

    /**
     * @dev Adds `account` to the blacklist.
     */
    function lockUser(address account) external onlyOwner {
        isBlackListed[account] = true;        
        emit LockedUser(account);
    }

    /**
     @dev Removes `account` from the blacklist.
     */
    function unlockUser(address account) external onlyOwner {
        isBlackListed[account] = false;
        emit UnlockedUser(account);
    }

    event LockedUser(address indexed account);
    event UnlockedUser(address indexed account);
}
// File: contracts/Token.sol



// SPDX-License-Identifier: MIT
                                                                           

pragma solidity ^0.8.0;

import './Security.sol';

contract PATTOKEN is Security {

    string private _name;
    string private _symbol;
    uint256 private _decimals;

    uint256 private _totalSupply;

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

    constructor() {
        _name ="PayAt Token ";
        _symbol = "PAT";
        _decimals = 18;

        _mint(_msgSender(), 90000000000 * 10 ** 18);
    }

    /**
    * @dev Returns the name of the token.
    */
    function name() public view returns (string memory) {
        return _name;
    }
    
    /**
    * @dev Returns the symbol of the token.
    */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
    * @dev Returns the decimals of the token.
    */
    function decimals() public view returns (uint256) {
        return _decimals;
    }

    /**
    * @dev Returns the total supply of the token.
    */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
    * @dev Returns the amount of tokens owned by `account`.
    */
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
    * @dev Returns the allowances.
    */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev Mints the amount of tokens by owner.
     */
    function mint(uint256 amount) public onlyOwner {
        _mint(_msgSender(), amount);
    }

    /**
     * @dev Burns the amount of tokens owned by caller.
     */
    function burn(uint256 amount) public {
        _burn(_msgSender(), amount);
    }

    function burnFrom(address account, uint256 value) public virtual {
        _spendAllowance(account, _msgSender(), value);
        _burn(account, value);
    }

    /**
    * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
    */
    function approve(address spender, uint256 amount) public whenNotPaused returns (bool) {
        address owner = _msgSender();
        require(!isBlackListed[owner], "PAT: locked account");
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev Increases the allowance of `spender` by `amount`.
     */
    function increaseAllowance(address spender, uint256 addedValue) public whenNotPaused returns (bool) {
        address owner = _msgSender();
        require(!isBlackListed[owner], "PAT: locked account");
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Decreases the allowance of `spender` by `amount`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public whenNotPaused returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);

        require(!isBlackListed[owner], "PAT: locked account");
        require(currentAllowance >= subtractedValue, "PAT: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
    * @dev Moves `amount` tokens from the caller's account to `to`.
    */
    function transfer(address to, uint256 amount) public whenNotPaused returns (bool) {
        address owner = _msgSender();
        require(!isBlackListed[owner], "PAT: locked account");
        _transfer(owner, to, amount);
        return true;
    }

    /**
    * @dev Moves `amount` tokens from `from` to `to` using the
    * allowance mechanism. `amount` is then deducted from the caller's
    * allowance.
    */
    function transferFrom(address from, address to, uint256 amount) public whenNotPaused returns (bool) {
        address spender = _msgSender();
        require(!isBlackListed[from], "PAT: locked account");
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /*////////////////////////////////////////////////
                    INTERNAL FUNCTIONS
      ////////////////////////////////////////////////*/

    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "PAT: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "PAT: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "PAT: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "PAT: approve from the zero address");
        require(spender != address(0), "PAT: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "PAT: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    function _transfer(address from, address to, uint256 amount) internal {
        require(from != address(0), "PAT: transfer from the zero address");
        require(to != address(0), "PAT: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "PAT: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal {}
    function _afterTokenTransfer(address from, address to, uint256 amount) internal {}

    /*////////////////////////////////////////////////
                    EVENTS
      ////////////////////////////////////////////////*/

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