// File: contracts/ManagerCore.sol



/*
    Copyright 2022 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.

    SPDX-License-Identifier: Apache License, Version 2.0
*/

pragma solidity 0.6.10;

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

import { AddressArrayUtils } from "./lib/AddressArrayUtils.sol";

/**
 * @title ManagerCore
 * @author Set Protocol
 *
 *  Registry for governance approved GlobalExtensions, DelegatedManagerFactories, and DelegatedManagers.
 */
contract ManagerCore is Ownable {
    using AddressArrayUtils for address[];

    /* ============ Events ============ */

    event ExtensionAdded(address indexed _extension);
    event ExtensionRemoved(address indexed _extension);
    event FactoryAdded(address indexed _factory);
    event FactoryRemoved(address indexed _factory);
    event ManagerAdded(address indexed _manager, address indexed _factory);
    event ManagerRemoved(address indexed _manager);

    /* ============ Modifiers ============ */

    /**
     * Throws if function is called by any address other than a valid factory.
     */
    modifier onlyFactory() {
        require(isFactory[msg.sender], "Only valid factories can call");
        _;
    }

    modifier onlyInitialized() {
        require(isInitialized, "Contract must be initialized.");
        _;
    }

    /* ============ State Variables ============ */

    // List of enabled extensions
    address[] public extensions;
    // List of enabled factories of managers
    address[] public factories;
    // List of enabled managers
    address[] public managers;

    // Mapping to check whether address is valid Extension, Factory, or Manager
    mapping(address => bool) public isExtension;
    mapping(address => bool) public isFactory;
    mapping(address => bool) public isManager;


    // Return true if the ManagerCore is initialized
    bool public isInitialized;

    /* ============ External Functions ============ */

    /**
     * Initializes any predeployed factories. Note: This function can only be called by
     * the owner once to batch initialize the initial system contracts.
     *
     * @param _extensions            List of extensions to add
     * @param _factories             List of factories to add
     */
    function initialize(
        address[] memory _extensions,
        address[] memory _factories
    )
        external
        onlyOwner
    {
        require(!isInitialized, "ManagerCore is already initialized");

        extensions = _extensions;
        factories = _factories;

        // Loop through and initialize isExtension and isFactory mapping
        for (uint256 i = 0; i < _extensions.length; i++) {
            _addExtension(_extensions[i]);
        }
        for (uint256 i = 0; i < _factories.length; i++) {
            _addFactory(_factories[i]);
        }

        // Set to true to only allow initialization once
        isInitialized = true;
    }

    /**
     * PRIVILEGED GOVERNANCE FUNCTION. Allows governance to add an extension
     *
     * @param _extension               Address of the extension contract to add
     */
    function addExtension(address _extension) external onlyInitialized onlyOwner {
        require(!isExtension[_extension], "Extension already exists");

        _addExtension(_extension);

        extensions.push(_extension);
    }

    /**
     * PRIVILEGED GOVERNANCE FUNCTION. Allows governance to remove an extension
     *
     * @param _extension               Address of the extension contract to remove
     */
    function removeExtension(address _extension) external onlyInitialized onlyOwner {
        require(isExtension[_extension], "Extension does not exist");

        extensions.removeStorage(_extension);

        isExtension[_extension] = false;

        emit ExtensionRemoved(_extension);
    }

    /**
     * PRIVILEGED GOVERNANCE FUNCTION. Allows governance to add a factory
     *
     * @param _factory               Address of the factory contract to add
     */
    function addFactory(address _factory) external onlyInitialized onlyOwner {
        require(!isFactory[_factory], "Factory already exists");

        _addFactory(_factory);

        factories.push(_factory);
    }

    /**
     * PRIVILEGED GOVERNANCE FUNCTION. Allows governance to remove a factory
     *
     * @param _factory               Address of the factory contract to remove
     */
    function removeFactory(address _factory) external onlyInitialized onlyOwner {
        require(isFactory[_factory], "Factory does not exist");

        factories.removeStorage(_factory);

        isFactory[_factory] = false;

        emit FactoryRemoved(_factory);
    }

    /**
     * PRIVILEGED FACTORY FUNCTION. Adds a newly deployed manager as an enabled manager.
     *
     * @param _manager               Address of the manager contract to add
     */
    function addManager(address _manager) external onlyInitialized onlyFactory {
        require(!isManager[_manager], "Manager already exists");

        isManager[_manager] = true;

        managers.push(_manager);

        emit ManagerAdded(_manager, msg.sender);
    }

    /**
     * PRIVILEGED GOVERNANCE FUNCTION. Allows governance to remove a manager
     *
     * @param _manager               Address of the manager contract to remove
     */
    function removeManager(address _manager) external onlyInitialized onlyOwner {
        require(isManager[_manager], "Manager does not exist");

        managers.removeStorage(_manager);

        isManager[_manager] = false;

        emit ManagerRemoved(_manager);
    }

    /* ============ External Getter Functions ============ */

    function getExtensions() external view returns (address[] memory) {
        return extensions;
    }

    function getFactories() external view returns (address[] memory) {
        return factories;
    }

    function getManagers() external view returns (address[] memory) {
        return managers;
    }

    /* ============ Internal Functions ============ */

    /**
     * Add an extension tracked on the ManagerCore
     *
     * @param _extension               Address of the extension contract to add
     */
    function _addExtension(address _extension) internal {
        require(_extension != address(0), "Zero address submitted.");

        isExtension[_extension] = true;

        emit ExtensionAdded(_extension);
    }

    /**
     * Add a factory tracked on the ManagerCore
     *
     * @param _factory               Address of the factory contract to add
     */
    function _addFactory(address _factory) internal {
        require(_factory != address(0), "Zero address submitted.");

        isFactory[_factory] = true;

        emit FactoryAdded(_factory);
    }
}
// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../GSN/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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/lib/AddressArrayUtils.sol



/*
    Copyright 2020 Set Labs Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.

    SPDX-License-Identifier: Apache License, Version 2.0
*/

pragma solidity 0.6.10;

/**
 * @title AddressArrayUtils
 * @author Set Protocol
 *
 * Utility functions to handle Address Arrays
 *
 * CHANGELOG:
 * - 4/27/21: Added validatePairsWithArray methods
 */
library AddressArrayUtils {

    /**
     * Finds the index of the first occurrence of the given element.
     * @param A The input array to search
     * @param a The value to find
     * @return Returns (index and isIn) for the first occurrence starting from index 0
     */
    function indexOf(address[] memory A, address a) internal pure returns (uint256, bool) {
        uint256 length = A.length;
        for (uint256 i = 0; i < length; i++) {
            if (A[i] == a) {
                return (i, true);
            }
        }
        return (uint256(-1), false);
    }

    /**
    * Returns true if the value is present in the list. Uses indexOf internally.
    * @param A The input array to search
    * @param a The value to find
    * @return Returns isIn for the first occurrence starting from index 0
    */
    function contains(address[] memory A, address a) internal pure returns (bool) {
        (, bool isIn) = indexOf(A, a);
        return isIn;
    }

    /**
    * Returns true if there are 2 elements that are the same in an array
    * @param A The input array to search
    * @return Returns boolean for the first occurrence of a duplicate
    */
    function hasDuplicate(address[] memory A) internal pure returns(bool) {
        require(A.length > 0, "A is empty");

        for (uint256 i = 0; i < A.length - 1; i++) {
            address current = A[i];
            for (uint256 j = i + 1; j < A.length; j++) {
                if (current == A[j]) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * @param A The input array to search
     * @param a The address to remove
     * @return Returns the array with the object removed.
     */
    function remove(address[] memory A, address a)
        internal
        pure
        returns (address[] memory)
    {
        (uint256 index, bool isIn) = indexOf(A, a);
        if (!isIn) {
            revert("Address not in array.");
        } else {
            (address[] memory _A,) = pop(A, index);
            return _A;
        }
    }

    /**
     * @param A The input array to search
     * @param a The address to remove
     */
    function removeStorage(address[] storage A, address a)
        internal
    {
        (uint256 index, bool isIn) = indexOf(A, a);
        if (!isIn) {
            revert("Address not in array.");
        } else {
            uint256 lastIndex = A.length - 1; // If the array would be empty, the previous line would throw, so no underflow here
            if (index != lastIndex) { A[index] = A[lastIndex]; }
            A.pop();
        }
    }

    /**
    * Removes specified index from array
    * @param A The input array to search
    * @param index The index to remove
    * @return Returns the new array and the removed entry
    */
    function pop(address[] memory A, uint256 index)
        internal
        pure
        returns (address[] memory, address)
    {
        uint256 length = A.length;
        require(index < A.length, "Index must be < A length");
        address[] memory newAddresses = new address[](length - 1);
        for (uint256 i = 0; i < index; i++) {
            newAddresses[i] = A[i];
        }
        for (uint256 j = index + 1; j < length; j++) {
            newAddresses[j - 1] = A[j];
        }
        return (newAddresses, A[index]);
    }

    /**
     * Returns the combination of the two arrays
     * @param A The first array
     * @param B The second array
     * @return Returns A extended by B
     */
    function extend(address[] memory A, address[] memory B) internal pure returns (address[] memory) {
        uint256 aLength = A.length;
        uint256 bLength = B.length;
        address[] memory newAddresses = new address[](aLength + bLength);
        for (uint256 i = 0; i < aLength; i++) {
            newAddresses[i] = A[i];
        }
        for (uint256 j = 0; j < bLength; j++) {
            newAddresses[aLength + j] = B[j];
        }
        return newAddresses;
    }

    /**
     * Validate that address and uint array lengths match. Validate address array is not empty
     * and contains no duplicate elements.
     *
     * @param A         Array of addresses
     * @param B         Array of uint
     */
    function validatePairsWithArray(address[] memory A, uint[] memory B) internal pure {
        require(A.length == B.length, "Array length mismatch");
        _validateLengthAndUniqueness(A);
    }

    /**
     * Validate that address and bool array lengths match. Validate address array is not empty
     * and contains no duplicate elements.
     *
     * @param A         Array of addresses
     * @param B         Array of bool
     */
    function validatePairsWithArray(address[] memory A, bool[] memory B) internal pure {
        require(A.length == B.length, "Array length mismatch");
        _validateLengthAndUniqueness(A);
    }

    /**
     * Validate that address and string array lengths match. Validate address array is not empty
     * and contains no duplicate elements.
     *
     * @param A         Array of addresses
     * @param B         Array of strings
     */
    function validatePairsWithArray(address[] memory A, string[] memory B) internal pure {
        require(A.length == B.length, "Array length mismatch");
        _validateLengthAndUniqueness(A);
    }

    /**
     * Validate that address array lengths match, and calling address array are not empty
     * and contain no duplicate elements.
     *
     * @param A         Array of addresses
     * @param B         Array of addresses
     */
    function validatePairsWithArray(address[] memory A, address[] memory B) internal pure {
        require(A.length == B.length, "Array length mismatch");
        _validateLengthAndUniqueness(A);
    }

    /**
     * Validate that address and bytes array lengths match. Validate address array is not empty
     * and contains no duplicate elements.
     *
     * @param A         Array of addresses
     * @param B         Array of bytes
     */
    function validatePairsWithArray(address[] memory A, bytes[] memory B) internal pure {
        require(A.length == B.length, "Array length mismatch");
        _validateLengthAndUniqueness(A);
    }

    /**
     * Validate address array is not empty and contains no duplicate elements.
     *
     * @param A          Array of addresses
     */
    function _validateLengthAndUniqueness(address[] memory A) internal pure {
        require(A.length > 0, "Array length must be > 0");
        require(!hasDuplicate(A), "Cannot duplicate addresses");
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}