// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
pragma solidity 0.8.25;

import {ERC1967} from "./utils/ERC1967.sol";
import {Call} from "./utils/Call.sol";
import {IInitializable} from "./interfaces/IInitializable.sol";

contract GatewayProxy is IInitializable {
    error Unauthorized();
    error NativeCurrencyNotAccepted();

    constructor(address implementation, bytes memory params) {
        // Store the address of the implementation contract
        ERC1967.store(implementation);
        // Initialize storage by calling the implementation's `initialize(bytes)` function
        // using `delegatecall`.
        (bool success, bytes memory returndata) =
            implementation.delegatecall(abi.encodeCall(IInitializable.initialize, params));
        Call.verifyResult(success, returndata);
    }

    // Prevent fallback() from calling `IInitializable.initialize(bytes)` on the implementation contract
    function initialize(bytes calldata) external pure {
        revert Unauthorized();
    }

    fallback() external payable {
        address implementation = ERC1967.load();
        assembly {
            calldatacopy(0, 0, calldatasize())
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
            returndatacopy(0, 0, returndatasize())
            switch result
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }

    // Prevent users from unwittingly sending ether to the gateway, as these funds
    // would otherwise be lost forever.
    receive() external payable {
        revert NativeCurrencyNotAccepted();
    }
}

// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
pragma solidity 0.8.25;

/// @title Minimal implementation of ERC1967 storage slot
library ERC1967 {
    // bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1)
    bytes32 public constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    function load() internal view returns (address implementation) {
        assembly {
            implementation := sload(_IMPLEMENTATION_SLOT)
        }
    }

    function store(address implementation) internal {
        assembly {
            sstore(_IMPLEMENTATION_SLOT, implementation)
        }
    }
}

// SPDX-License-Identifier: MIT
// SPDX-FileCopyrightText: 2023 OpenZeppelin
// SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
pragma solidity 0.8.25;

// Derived from OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)
library Call {
    function verifyResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert();
            }
        }
    }
}

// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
pragma solidity 0.8.25;

/**
 * @title Initialization of gateway logic contracts
 */
interface IInitializable {
    function initialize(bytes calldata data) external;
}

{
  "remappings": [
    "canonical-weth/=lib/canonical-weth/contracts/",
    "ds-test/=lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/",
    "prb/math/=lib/prb-math/",
    "@prb/test/=lib/prb-math/lib/prb-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "prb-math/=lib/prb-math/src/",
    "prb-test/=lib/prb-math/lib/prb-test/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 20000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": true,
  "libraries": {
    "src/Assets.sol": {
      "Assets": "0x529D0D2DB206a7Cde8C7119Cf45dE3F19c138e03"
    },
    "src/Verification.sol": {
      "Verification": "0xD981a496b748D9E60fdDfFB3ffeAABCFD6FCf0C5"
    }
  }
}

[{"inputs":[{"internalType":"address","name":"implementation","type":"address"},{"internalType":"bytes","name":"params","type":"bytes"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"NativeCurrencyNotAccepted","type":"error"},{"inputs":[],"name":"Unauthorized","type":"error"},{"stateMutability":"payable","type":"fallback"},{"inputs":[{"internalType":"bytes","name":"","type":"bytes"}],"name":"initialize","outputs":[],"stateMutability":"pure","type":"function"},{"stateMutability":"payable","type":"receive"}]

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