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/**
 *     NOTICE
 *
 *     The T-REX software is licensed under a proprietary license or the GPL v.3.
 *     If you choose to receive it under the GPL v.3 license, the following applies:
 *     T-REX is a suite of smart contracts implementing the ERC-3643 standard and
 *     developed by Tokeny to manage and transfer financial assets on EVM blockchains
 *
 *     Copyright (C) 2023, Tokeny sàrl.
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

pragma solidity 0.8.17;

import "./interface/IProxy.sol";
import "./authority/ITREXImplementationAuthority.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";

abstract contract AbstractProxy is IProxy, Initializable {

    /**
     *  @dev See {IProxy-setImplementationAuthority}.
     */
    function setImplementationAuthority(address _newImplementationAuthority) external override {
        require(msg.sender == getImplementationAuthority(), "only current implementationAuthority can call");
        require(_newImplementationAuthority != address(0), "invalid argument - zero address");
        require(
            (ITREXImplementationAuthority(_newImplementationAuthority)).getTokenImplementation() != address(0)
            && (ITREXImplementationAuthority(_newImplementationAuthority)).getCTRImplementation() != address(0)
            && (ITREXImplementationAuthority(_newImplementationAuthority)).getIRImplementation() != address(0)
            && (ITREXImplementationAuthority(_newImplementationAuthority)).getIRSImplementation() != address(0)
            && (ITREXImplementationAuthority(_newImplementationAuthority)).getMCImplementation() != address(0)
            && (ITREXImplementationAuthority(_newImplementationAuthority)).getTIRImplementation() != address(0)
        , "invalid Implementation Authority");
        _storeImplementationAuthority(_newImplementationAuthority);
        emit ImplementationAuthoritySet(_newImplementationAuthority);
    }

    /**
     *  @dev See {IProxy-getImplementationAuthority}.
     */
    function getImplementationAuthority() public override view returns(address) {
        address implemAuth;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            implemAuth := sload(0x821f3e4d3d679f19eacc940c87acf846ea6eae24a63058ea750304437a62aafc)
        }
        return implemAuth;
    }

    /**
     *  @dev store the implementationAuthority contract address using the ERC-3643 implementation slot in storage
     *  the slot storage is the result of `keccak256("ERC-3643.proxy.beacon")`
     */
    function _storeImplementationAuthority(address implementationAuthority) internal {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(0x821f3e4d3d679f19eacc940c87acf846ea6eae24a63058ea750304437a62aafc, implementationAuthority)
        }
    }

}