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// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.17;

import "../interface/IImplementationAuthority.sol";

contract IdentityProxy {

    /**
     *  @dev constructor of the proxy Identity contract
     *  @param _implementationAuthority the implementation Authority contract address
     *  @param initialManagementKey the management key at deployment
     *  the proxy is going to use the logic deployed on the implementation contract
     *  deployed at an address listed in the ImplementationAuthority contract
     */
    constructor(address _implementationAuthority, address initialManagementKey) {
        require(_implementationAuthority != address(0), "invalid argument - zero address");
        require(initialManagementKey != address(0), "invalid argument - zero address");

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(0x821f3e4d3d679f19eacc940c87acf846ea6eae24a63058ea750304437a62aafc, _implementationAuthority)
        }

        address logic = IImplementationAuthority(_implementationAuthority).getImplementation();

        // solhint-disable-next-line avoid-low-level-calls
        (bool success,) = logic.delegatecall(abi.encodeWithSignature("initialize(address)", initialManagementKey));
        require(success, "Initialization failed.");
    }

    /**
     *  @dev fallback proxy function used for any transaction call that is made using
     *  the Identity contract ABI and called on the proxy contract
     *  The proxy will update its local storage depending on the behaviour requested
     *  by the implementation contract given by the Implementation Authority
     */
    // solhint-disable-next-line no-complex-fallback
    fallback() external payable {
        address logic = IImplementationAuthority(implementationAuthority()).getImplementation();

        // solhint-disable-next-line no-inline-assembly
        assembly {
        calldatacopy(0x0, 0x0, calldatasize())
        let success := delegatecall(sub(gas(), 10000), logic, 0x0, calldatasize(), 0, 0)
        let retSz := returndatasize()
        returndatacopy(0, 0, retSz)
        switch success
            case 0 {
                revert(0, retSz)
            }
            default {
                return(0, retSz)
            }
        }
    }

    function implementationAuthority() public view returns(address) {
        address implemAuth;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            implemAuth := sload(0x821f3e4d3d679f19eacc940c87acf846ea6eae24a63058ea750304437a62aafc)
        }
        return implemAuth;
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.17;

interface IImplementationAuthority {

    // event emitted when the implementation contract is updated
    event UpdatedImplementation(address newAddress);

    /**
     * @dev updates the address used as implementation by the proxies linked
     * to this ImplementationAuthority contract
     * @param _newImplementation the address of the new implementation contract
     * only Owner can call
     */
    function updateImplementation(address _newImplementation) external;

    /**
     * @dev returns the address of the implementation
     */
    function getImplementation() external view returns(address);
}

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

[{"inputs":[{"internalType":"address","name":"_implementationAuthority","type":"address"},{"internalType":"address","name":"initialManagementKey","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"implementationAuthority","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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