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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;

import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
import {PayrollManagement} from "./PayrollManagement.sol";

contract PayrollFactory is AccessControl {
    // Custom errors
    error PayrollExists(); // Thrown when a payroll contract already exists for an employer
    error InvalidAddress(); // Thrown when an invalid address is provided
    error PayrollNotFound(); // Thrown when no payroll contract is found for an employer
    error NotApprovedEmployer(); // Thrown when an employer is not approved by the admin
    error InvalidPayrollContract(); // Thrown when an invalid payroll contract address is provided

    // Roles
    bytes32 public constant FACTORY_ADMIN = keccak256("FACTORY_ADMIN"); // Role for factory admin

    // State variables
    mapping(address => address) public employerToPayrollContract; // employer => payroll contract address
    mapping(address => bool) public isPayrollContract; // contract address => whether it is a payroll contract
    mapping(address => bool) public approvedEmployers; // employer => whether they are approved by the admin
    address public immutable usdcToken; // USDC token address

    // Events
    event PayrollContractCreated(
        address indexed employer, 
        address indexed payrollContract
    ); // Emitted when a new payroll contract is created
    event EmployerApproved(address indexed employer); // Emitted when an employer is approved by the admin
    event AIAgentRoleGranted(address indexed payrollContract, address indexed aiAgent); // Emitted when AI_AGENT_ROLE is granted
    event PayrollContractPaused(address indexed payrollContract); // Emitted when a payroll contract is paused
    event PayrollContractUnpaused(address indexed payrollContract); // Emitted when a payroll contract is unpaused

    /**
     * @dev Constructor to initialize the factory.
     * @param _usdcToken Address of the USDC token contract.
     */
    constructor(address _usdcToken) {
        if (_usdcToken == address(0)) revert InvalidAddress(); // Ensure USDC token address is valid

        // Grant roles to the deployer
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _grantRole(FACTORY_ADMIN, msg.sender);

        usdcToken = _usdcToken; // Initialize USDC token address
    }

    /**
     * @dev Approves an employer to deploy their payroll contract.
     * @param _employer Address of the employer to approve.
     */
    function approveEmployer(address _employer) external onlyRole(FACTORY_ADMIN) {
        if (_employer == address(0)) revert InvalidAddress(); // Ensure employer address is valid
        approvedEmployers[_employer] = true; // Approve the employer
        emit EmployerApproved(_employer); // Emit event
    }

    /**
    * @dev Deploys a new PayrollManagement contract for an employer.
    * @return address The address of the deployed payroll contract.
    */
    function createPayrollContract() external returns (address) {
        // Checks
        if (!approvedEmployers[msg.sender]) revert NotApprovedEmployer();
        if (employerToPayrollContract[msg.sender] != address(0)) revert PayrollExists();

        // Effects
        PayrollManagement payrollContract = new PayrollManagement(usdcToken);
        address payrollAddress = address(payrollContract);
        
        employerToPayrollContract[msg.sender] = payrollAddress;
        isPayrollContract[payrollAddress] = true;

        // Events
        emit PayrollContractCreated(msg.sender, payrollAddress);

        // Interactions
        payrollContract.grantRole(payrollContract.ADMIN_ROLE(), address(this));
        payrollContract.grantRole(payrollContract.EMPLOYER_ROLE(), msg.sender);

        return payrollAddress;
    }


    /**
    * @dev Grants the AI_AGENT_ROLE to an address in a specific payroll contract.
    * @param _payrollContract Address of the payroll contract.
    * @param _aiAgent Address of the AI agent.
    */
    function grantAIAgentRole(address _payrollContract, address _aiAgent) external onlyRole(FACTORY_ADMIN) {
        // Checks
        if (_payrollContract == address(0) || _aiAgent == address(0)) revert InvalidAddress();
        if (!isPayrollContract[_payrollContract]) revert InvalidPayrollContract();

        // Events
        emit AIAgentRoleGranted(_payrollContract, _aiAgent);

        // Interactions
        PayrollManagement payrollContract = PayrollManagement(_payrollContract);
        payrollContract.grantRole(payrollContract.AI_AGENT_ROLE(), _aiAgent);
    }

    /**
     * @dev Retrieves the payroll contract address for a given employer.
     * @param _employer Address of the employer.
     * @return address The address of the payroll contract.
     */
    function getPayrollContract(address _employer) external view returns (address) {
        if (_employer == address(0)) revert InvalidAddress(); // Validate employer address
        address payrollAddress = employerToPayrollContract[_employer];
        if (payrollAddress == address(0)) revert PayrollNotFound(); // Ensure payroll contract exists
        return payrollAddress;
    }

    /**
     * @dev Checks if an address is a valid payroll contract.
     * @param _contract Address to verify.
     * @return bool True if the address is a valid payroll contract.
     */
    function isValidPayrollContract(address _contract) external view returns (bool) {
        return isPayrollContract[_contract]; // Return whether the address is a payroll contract
    }

    
    /**
    * @dev Pauses a payroll contract (only callable by the factory admin).
    * @param _payrollContract Address of the payroll contract to pause.
    */
    function pausePayrollContract(address _payrollContract) external onlyRole(FACTORY_ADMIN) {
        // Checks
        if (_payrollContract == address(0)) revert InvalidAddress();
        if (!isPayrollContract[_payrollContract]) revert InvalidPayrollContract();

        // Events
        emit PayrollContractPaused(_payrollContract);

        // Interactions
        PayrollManagement payrollContract = PayrollManagement(_payrollContract);
        payrollContract.pause();
    }

    /**
    * @dev Unpauses a payroll contract (only callable by the factory admin).
    * @param _payrollContract Address of the payroll contract to unpause.
    */
    function unpausePayrollContract(address _payrollContract) external onlyRole(FACTORY_ADMIN) {
        // Checks
        if (_payrollContract == address(0)) revert InvalidAddress();
        if (!isPayrollContract[_payrollContract]) revert InvalidPayrollContract();

        // Events
        emit PayrollContractUnpaused(_payrollContract);

        // Interactions
        PayrollManagement payrollContract = PayrollManagement(_payrollContract);
        payrollContract.unpause();
    }

    /**
     * @dev Retrieves the list of employees for a given employer.
     * @param _employer Address of the employer.
     * @return uint256[] Array of employee IDs.
     */
    function getEmployerEmployees(address _employer) external view returns (uint256[] memory) {
        if (_employer == address(0)) revert InvalidAddress(); // Validate employer address
        address payrollContract = employerToPayrollContract[_employer];
        if (payrollContract == address(0)) revert PayrollNotFound(); // Ensure payroll contract exists
        return PayrollManagement(payrollContract).getEmployerEmployees(_employer);
    }

    /**
    * @dev Retrieves details of a specific employee for a given employer.
    * @param _employer Address of the employer.
    * @param _employeeId ID of the employee.
    * @return employeeId Employee ID.
    * @return walletAddress Employee wallet address.
    * @return salary Employee salary.
    * @return joiningDate Employee joining date.
    * @return isActive Whether the employee is active.
    */
    function getEmployeeDetails(address _employer, uint256 _employeeId)
        external
        view
        returns (
            uint256 employeeId,
            address walletAddress,
            uint256 salary,
            uint256 joiningDate,
            bool isActive
        )
    {
        if (_employer == address(0)) revert InvalidAddress();
        address payrollContract = employerToPayrollContract[_employer];
        if (payrollContract == address(0)) revert PayrollNotFound();
        
        (employeeId, walletAddress, salary, joiningDate, isActive) = 
            PayrollManagement(payrollContract).getEmployeeDetails(_employer, _employeeId);
    }


    /**
     * @dev Retrieves the balance of a given employer.
     * @param _employer Address of the employer.
     * @return uint256 Employer's balance.
     */
    function getEmployerBalance(address _employer) external view returns (uint256) {
        if (_employer == address(0)) revert InvalidAddress(); // Validate employer address
        address payrollContract = employerToPayrollContract[_employer];
        if (payrollContract == address(0)) revert PayrollNotFound(); // Ensure payroll contract exists
        return PayrollManagement(payrollContract).getEmployerBalance(_employer);
    }
}

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

pragma solidity ^0.8.20;

import {IAccessControl} from "./IAccessControl.sol";
import {Context} from "../utils/Context.sol";
import {ERC165} from "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address account => bool) hasRole;
        bytes32 adminRole;
    }

    mapping(bytes32 role => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with an {AccessControlUnauthorizedAccount} error including the required role.
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual returns (bool) {
        return _roles[role].hasRole[account];
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `_msgSender()`
     * is missing `role`. Overriding this function changes the behavior of the {onlyRole} modifier.
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `account`
     * is missing `role`.
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert AccessControlUnauthorizedAccount(account, role);
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address callerConfirmation) public virtual {
        if (callerConfirmation != _msgSender()) {
            revert AccessControlBadConfirmation();
        }

        _revokeRole(role, callerConfirmation);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Attempts to grant `role` to `account` and returns a boolean indicating if `role` was granted.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual returns (bool) {
        if (!hasRole(role, account)) {
            _roles[role].hasRole[account] = true;
            emit RoleGranted(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Attempts to revoke `role` to `account` and returns a boolean indicating if `role` was revoked.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual returns (bool) {
        if (hasRole(role, account)) {
            _roles[role].hasRole[account] = false;
            emit RoleRevoked(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (access/IAccessControl.sol)

pragma solidity ^0.8.20;

/**
 * @dev External interface of AccessControl declared to support ERC-165 detection.
 */
interface IAccessControl {
    /**
     * @dev The `account` is missing a role.
     */
    error AccessControlUnauthorizedAccount(address account, bytes32 neededRole);

    /**
     * @dev The caller of a function is not the expected one.
     *
     * NOTE: Don't confuse with {AccessControlUnauthorizedAccount}.
     */
    error AccessControlBadConfirmation();

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call. This account bears the admin role (for the granted role).
     * Expected in cases where the role was granted using the internal {AccessControl-_grantRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     */
    function renounceRole(bytes32 role, address callerConfirmation) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/IERC1363.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC165.sol)

pragma solidity ^0.8.20;

import {IERC165} from "../utils/introspection/IERC165.sol";

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

pragma solidity ^0.8.20;

import {IERC20} from "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.2.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}

// 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 v5.1.0) (utils/introspection/ERC165.sol)

pragma solidity ^0.8.20;

import {IERC165} from "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC-165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

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

pragma solidity ^0.8.20;

import {Context} from "../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 {
    bool private _paused;

    /**
     * @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);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @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 {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @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());
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;

import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
import {Pausable} from "@openzeppelin/contracts/utils/Pausable.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

contract PayrollManagement is AccessControl, Pausable {
    using SafeERC20 for IERC20;

    // Custom errors
    error InvalidAddress(); // Thrown when an invalid address is provided
    error EmployeeAlreadyExists(); // Thrown when an employee already exists
    error EmployeeNotFound(); // Thrown when an employee is not found
    error UnauthorizedAccess(); // Thrown when unauthorized access is attempted
    error InvalidPayrollCycle(); // Thrown when an invalid payroll cycle is provided
    error InsufficientBalance(); // Thrown when there are insufficient funds
    error TransferFailed(); // Thrown when a token transfer fails
    error PayrollAlreadyProcessed(); // Thrown when payroll is already processed
    error ZeroAmount(); // Thrown when a zero amount is provided

    // Roles
    bytes32 public constant ADMIN_ROLE = keccak256("ADMIN_ROLE"); // Role for admin
    bytes32 public constant EMPLOYER_ROLE = keccak256("EMPLOYER_ROLE"); // Role for employer
    bytes32 public constant AI_AGENT_ROLE = keccak256("AI_AGENT_ROLE"); // Role for AI agent

    // Immutable USDC token contract
    IERC20 public immutable usdcToken;

    // Structs
    struct Employee {
        uint256 employeeId; // Unique ID for the employee
        address walletAddress; // Employee's wallet address
        uint256 salary; // Monthly salary in USDC (6 decimals)
        uint256 joiningDate; // Date when the employee joined
        bool isActive; // Whether the employee is active
    }

    struct PayrollCycle {
        uint256 cycleId; // Unique ID for the payroll cycle
        uint256 startDate; // Start date of the payroll cycle
        uint256 endDate; // End date of the payroll cycle
        bool isProcessed; // Whether the payroll cycle has been processed
    }

    // State variables
    mapping(address => mapping(uint256 => Employee)) public employeesByEmployer; // employer => employeeId => Employee
    mapping(address => uint256[]) public employerEmployees; // employer => employeeIds[]
    mapping(address => mapping(uint256 => PayrollCycle[])) public employeePayrollCycles; // employer => employeeId => PayrollCycle[]
    mapping(address => uint256) public employeeCounter; // employer => counter for employee IDs
    mapping(address => uint256) public employerBalances; // employer => deposited funds

    // Events
    event EmployeeAdded(address indexed employer, uint256 indexed employeeId, address walletAddress); // Emitted when an employee is added
    event EmployeeUpdated(address indexed employer, uint256 indexed employeeId); // Emitted when an employee is updated
    event EmployeeDeactivated(address indexed employer, uint256 indexed employeeId); // Emitted when an employee is deactivated
    event PayrollCycleCreated(address indexed employer, uint256 indexed employeeId, uint256 cycleId, uint256 startDate, uint256 endDate); // Emitted when a payroll cycle is created
    event SalaryPaid(address indexed employer, uint256 indexed employeeId, uint256 amount); // Emitted when salary is paid
    event FundsAdded(address indexed employer, uint256 amount); // Emitted when funds are added

    // Constructor
    constructor(address _usdcToken) {
        if (_usdcToken == address(0)) revert InvalidAddress(); // Ensure USDC token address is valid
        usdcToken = IERC20(_usdcToken); // Initialize USDC token
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender); // Grant admin role to the deployer
    }

    // Modifiers
    modifier onlyEmployerOf(uint256 _employeeId) {
        if (employeesByEmployer[msg.sender][_employeeId].walletAddress == address(0)) 
            revert EmployeeNotFound(); // Ensure the employee exists under the employer
        _;
    }

    // Functions

    /**
     * @dev Adds a new employee for the employer.
     * @param _walletAddress The wallet address of the employee.
     * @param _salary The monthly salary of the employee in USDC.
     * @return The ID of the newly added employee.
     */
    function addEmployee(
        address _walletAddress,
        uint256 _salary
    ) external onlyRole(EMPLOYER_ROLE) returns (uint256) {
        if (_walletAddress == address(0)) revert InvalidAddress(); // Ensure wallet address is valid
        
        uint256 newEmployeeId = ++employeeCounter[msg.sender]; // Increment employee counter
        
        // Create a new employee
        Employee storage newEmployee = employeesByEmployer[msg.sender][newEmployeeId];
        newEmployee.employeeId = newEmployeeId;
        newEmployee.walletAddress = _walletAddress;
        newEmployee.salary = _salary;
        newEmployee.joiningDate = block.timestamp;
        newEmployee.isActive = true;

        // Add employee ID to the employer's list
        employerEmployees[msg.sender].push(newEmployeeId);
        
        emit EmployeeAdded(msg.sender, newEmployeeId, _walletAddress); // Emit event
        return newEmployeeId;
    }

    /**
     * @dev Creates a new payroll cycle for an employee.
     * @param _employeeId The ID of the employee.
     * @param _startDate The start date of the payroll cycle.
     * @param _endDate The end date of the payroll cycle.
     */
    function createPayrollCycle(
    uint256 _employeeId,
    uint256 _startDate,
    uint256 _endDate
    ) external onlyRole(EMPLOYER_ROLE) onlyEmployerOf(_employeeId) {
        // Check if employee is active
        Employee storage employee = employeesByEmployer[msg.sender][_employeeId];
        if (!employee.isActive) revert EmployeeNotFound();

        // Validate cycle dates
        if (_startDate >= _endDate) revert InvalidPayrollCycle();

        PayrollCycle[] storage cycles = employeePayrollCycles[msg.sender][_employeeId];
        uint256 cycleId = cycles.length;

        // Add the new payroll cycle
        cycles.push(PayrollCycle({
            cycleId: cycleId,
            startDate: _startDate,
            endDate: _endDate,
            isProcessed: false
        }));

        emit PayrollCycleCreated(msg.sender, _employeeId, cycleId, _startDate, _endDate);
    }


    /**
     * @dev Processes payroll for an employee in a specific cycle.
     * @param _employeeId The ID of the employee.
     * @param _cycleId The ID of the payroll cycle.
     */
    function processPayroll(
        uint256 _employeeId, 
        uint256 _cycleId
    ) external onlyRole(EMPLOYER_ROLE) onlyEmployerOf(_employeeId) whenNotPaused {
        Employee storage employee = employeesByEmployer[msg.sender][_employeeId];
        if (!employee.isActive) revert EmployeeNotFound(); // Ensure employee is active

        PayrollCycle storage cycle = employeePayrollCycles[msg.sender][_employeeId][_cycleId];
        if (cycle.isProcessed) revert PayrollAlreadyProcessed(); // Ensure payroll is not already processed
        if (block.timestamp < cycle.startDate || block.timestamp > cycle.endDate) 
            revert InvalidPayrollCycle(); // Ensure current time is within the payroll cycle

        uint256 salaryAmount = employee.salary;
        if (employerBalances[msg.sender] < salaryAmount) 
            revert InsufficientBalance(); // Ensure sufficient balance

        // Mark payroll as processed and deduct salary from employer's balance
        cycle.isProcessed = true;
        employerBalances[msg.sender] -= salaryAmount;
        
        // Transfer salary to employee
        usdcToken.safeTransfer(employee.walletAddress, salaryAmount);

        emit SalaryPaid(msg.sender, _employeeId, salaryAmount); // Emit event
    }

    /**
    * @dev Adds funds to the employer's balance.
    * @param _amount The amount of USDC to add.
    */
    function addFunds(uint256 _amount) external onlyRole(EMPLOYER_ROLE) {
        if (_amount == 0) revert ZeroAmount(); // Ensure amount is not zero
        
        // Check if contract has sufficient allowance
        uint256 allowance = usdcToken.allowance(msg.sender, address(this));
        if (allowance < _amount) revert("Insufficient allowance");
        
        // Transfer USDC to contract
        usdcToken.safeTransferFrom(msg.sender, address(this), _amount);
        
        // Update employer's balance
        employerBalances[msg.sender] += _amount;
        
        emit FundsAdded(msg.sender, _amount);
    }
    /**
     * @dev Deactivates an employee.
     * @param _employeeId The ID of the employee.
     */
    function deactivateEmployee(uint256 _employeeId) 
        external 
        onlyRole(EMPLOYER_ROLE) 
        onlyEmployerOf(_employeeId) 
    {
        employeesByEmployer[msg.sender][_employeeId].isActive = false; // Deactivate employee
        emit EmployeeDeactivated(msg.sender, _employeeId); // Emit event
    }

    /**
     * @dev Pauses the contract (admin only).
     */
    function pause() external onlyRole(ADMIN_ROLE) {
        _pause();
    }
    
    /**
     * @dev Unpauses the contract (admin only).
     */
    function unpause() external onlyRole(ADMIN_ROLE) {
        _unpause();
    }

    /**
     * @dev Allows the AI agent to process payroll.
     * @param _employer Address of the employer.
     * @param _employeeId The ID of the employee.
     * @param _cycleId The ID of the payroll cycle.
     */
    function processPayrollAsAI(
        address _employer,
        uint256 _employeeId, 
        uint256 _cycleId
    ) external onlyRole(AI_AGENT_ROLE) whenNotPaused {
        Employee storage employee = employeesByEmployer[_employer][_employeeId];
        if (!employee.isActive) revert EmployeeNotFound(); // Ensure employee is active

        PayrollCycle storage cycle = employeePayrollCycles[_employer][_employeeId][_cycleId];
        if (cycle.isProcessed) revert PayrollAlreadyProcessed(); // Ensure payroll is not already processed
        if (block.timestamp < cycle.startDate || block.timestamp > cycle.endDate) 
            revert InvalidPayrollCycle(); // Ensure current time is within the payroll cycle

        uint256 salaryAmount = employee.salary;
        if (employerBalances[_employer] < salaryAmount) 
            revert InsufficientBalance(); // Ensure sufficient balance

        // Mark payroll as processed and deduct salary from employer's balance
        cycle.isProcessed = true;
        employerBalances[_employer] -= salaryAmount;
        
        // Transfer salary to employee
        usdcToken.safeTransfer(employee.walletAddress, salaryAmount);

        emit SalaryPaid(_employer, _employeeId, salaryAmount); // Emit event
    }

    /**
     * @dev Returns the employer's current balance stored in the contract.
     * @param _employer The address of the employer.
     * @return The employer's USDC balance.
     */
    function getEmployerBalance(address _employer) external view returns (uint256) {
        return employerBalances[_employer];
    }

    /**
     * @dev Returns the list of employee IDs for a given employer.
     * @param _employer The address of the employer.
     * @return An array of employee IDs.
     */
    function getEmployerEmployees(address _employer) external view returns (uint256[] memory) {
        return employerEmployees[_employer];
    }

    /**
     * @dev Returns detailed information for a given employee.
     * @param _employer The address of the employer.
     * @param _employeeId The ID of the employee.
     * @return employeeId The employee's ID.
     * @return walletAddress The employee's wallet address.
     * @return salary The employee's salary in USDC.
     * @return joiningDate The timestamp when the employee joined.
     * @return isActive Whether the employee is currently active.
     */
    function getEmployeeDetails(address _employer, uint256 _employeeId)
        external
        view
        returns (
            uint256 employeeId,
            address walletAddress,
            uint256 salary,
            uint256 joiningDate,
            bool isActive
        )
    {
        Employee memory emp = employeesByEmployer[_employer][_employeeId];
        return (emp.employeeId, emp.walletAddress, emp.salary, emp.joiningDate, emp.isActive);
    }
}

{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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},{"internalType":"address","name":"_aiAgent","type":"address"}],"name":"grantAIAgentRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isPayrollContract","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_contract","type":"address"}],"name":"isValidPayrollContract","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_payrollContract","type":"address"}],"name":"pausePayrollContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"callerConfirmation","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_payrollContract","type":"address"}],"name":"unpausePayrollContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"usdcToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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00000000000000000000000019f025ba859fbfa4768fcc4faf6db4a3f7e51652

-----Decoded View---------------
Arg [0] : _usdcToken (address): 0x19F025Ba859Fbfa4768fCc4FaF6db4A3f7E51652

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000019f025ba859fbfa4768fcc4faf6db4a3f7e51652