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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/// @notice A sufficiently minimal ERC1967 proxy tailor-made for ZKsync.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/ext/zksync/ERC1967Proxy.sol)
contract ERC1967Proxy {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                           EVENTS                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Emitted when the proxy's implementation is upgraded.
    event Upgraded(address indexed implementation);

    /// @dev `keccak256(bytes("Upgraded(address)"))`.
    uint256 private constant _UPGRADED_EVENT_SIGNATURE =
        0xbc7cd75a20ee27fd9adebab32041f755214dbc6bffa90cc0225b39da2e5c2d3b;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          STORAGE                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The ERC-1967 storage slot for the implementation in the proxy.
    /// `uint256(keccak256("eip1967.proxy.implementation")) - 1`.
    bytes32 internal constant _ERC1967_IMPLEMENTATION_SLOT =
        0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /// @dev The storage slot for the deployer.
    /// `uint256(keccak256("ERC1967Proxy.deployer")) - 1`.
    bytes32 internal constant _ERC1967_PROXY_DEPLOYER_SLOT =
        0xc20b8dda59e1f49cae9bbc6c3744edc7900ba02880cd7b33b5b82a96197202ba;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                        CONSTRUCTOR                         */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    constructor() payable {
        /// @solidity memory-safe-assembly
        assembly {
            sstore(_ERC1967_PROXY_DEPLOYER_SLOT, caller())
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          FALLBACK                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    fallback() external payable virtual {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x40, 0) // Optimization trick to remove free memory pointer initialization.
            // For the special case of 1-byte calldata, return the implementation.
            if eq(calldatasize(), 1) {
                mstore(0x00, sload(_ERC1967_IMPLEMENTATION_SLOT))
                return(0x00, 0x20)
            }
            // Deployer workflow.
            if eq(caller(), sload(_ERC1967_PROXY_DEPLOYER_SLOT)) {
                let newImplementation := calldataload(0x00)
                sstore(_ERC1967_IMPLEMENTATION_SLOT, newImplementation)
                if gt(calldatasize(), 0x20) {
                    let n := sub(calldatasize(), 0x20)
                    calldatacopy(0x00, 0x20, n)
                    if iszero(delegatecall(gas(), newImplementation, 0x00, n, 0x00, 0x00)) {
                        // Bubble up the revert if the call reverts.
                        returndatacopy(0x00, 0x00, returndatasize())
                        revert(0x00, returndatasize())
                    }
                }
                // Emit the {Upgraded} event.
                log2(0x00, 0x00, _UPGRADED_EVENT_SIGNATURE, newImplementation)
                stop() // End the context.
            }
            // Perform the delegatecall.
            let implementation := sload(_ERC1967_IMPLEMENTATION_SLOT)
            calldatacopy(0x00, 0x00, calldatasize())
            let s := delegatecall(gas(), implementation, 0x00, calldatasize(), 0x00, 0x00)
            returndatacopy(0x00, 0x00, returndatasize())
            if iszero(s) { revert(0x00, returndatasize()) }
            return(0x00, returndatasize())
        }
    }
}

{
  "viaIR": false,
  "codegen": "yul",
  "remappings": [
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts-upgradeable/lib/openzeppelin-contracts/contracts/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "halmos-cheatcodes/=lib/openzeppelin-contracts-upgradeable/lib/halmos-cheatcodes/src/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts-upgradeable/lib/openzeppelin-contracts/",
    "solady/=lib/solady/src/",
    "@limitbreak/creator-token-standards/=lib/creator-token-standards/",
    "@limitbreak/permit-c/=lib/creator-token-standards/lib/PermitC/src/",
    "@opensea/tstorish/=lib/creator-token-standards/lib/tstorish/src/",
    "@rari-capital/solmate/=lib/creator-token-standards/lib/PermitC/lib/solmate/",
    "ERC721A/=lib/creator-token-standards/lib/ERC721A/contracts/",
    "PermitC/=lib/creator-token-standards/lib/PermitC/",
    "creator-token-standards/=lib/creator-token-standards/",
    "ds-test/=lib/creator-token-standards/lib/forge-std/lib/ds-test/src/",
    "erc721a/=lib/creator-token-standards/lib/ERC721A/",
    "forge-gas-metering/=lib/creator-token-standards/lib/PermitC/lib/forge-gas-metering/",
    "murky/=lib/creator-token-standards/lib/murky/",
    "openzeppelin/=lib/creator-token-standards/lib/PermitC/lib/openzeppelin-contracts/contracts/",
    "solmate/=lib/creator-token-standards/lib/PermitC/lib/solmate/src/",
    "tstorish/=lib/creator-token-standards/lib/tstorish/src/"
  ],
  "evmVersion": "cancun",
  "outputSelection": {
    "*": {
      "*": [
        "abi"
      ]
    }
  },
  "optimizer": {
    "enabled": true,
    "mode": "3",
    "size_fallback": false,
    "disable_system_request_memoization": true
  },
  "metadata": {},
  "libraries": {},
  "enableEraVMExtensions": false,
  "forceEVMLA": false
}

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[{"inputs":[],"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"implementation","type":"address"}],"name":"Upgraded","type":"event"},{"stateMutability":"payable","type":"fallback"}]

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