// SPDX-License-Identifier: Unlicense
pragma solidity >=0.7.6;

/// @notice Contains event declarations related to NutBerry.
// Audit-1: ok
interface NutBerryEvents {
  event BlockBeacon();
  event CustomBlockBeacon();
  event NewSolution();
  event RollupUpgrade(address target);
}

// SPDX-License-Identifier: Unlicense
pragma solidity >=0.7.6;

import '@NutBerry/NutBerry/src/tsm/contracts/NutBerryEvents.sol';

/// @notice Callforwarding proxy
// Audit-1: ok
contract RollupProxy is NutBerryEvents {
  constructor (address initialImplementation) {
    assembly {
      // stores the initial contract address to forward calls
      sstore(not(returndatasize()), initialImplementation)
      // created at block - a hint for clients to know from which block to start syncing events
      sstore(0x319a610c8254af7ecb1f669fb64fa36285b80cad26faf7087184ce1dceb114df, number())
    }
    // emit upgrade event
    emit NutBerryEvents.RollupUpgrade(initialImplementation);
  }

  fallback () external payable {
    assembly {
      // copy all calldata into memory - returndatasize() is a substitute for `0`
      calldatacopy(returndatasize(), returndatasize(), calldatasize())
      // keep a copy to be used after the call
      let zero := returndatasize()
      // call contract address loaded from storage slot with key `uint256(-1)`
      let success := delegatecall(
        gas(),
        sload(not(returndatasize())),
        returndatasize(),
        calldatasize(),
        returndatasize(),
        returndatasize()
      )

      // copy all return data into memory
      returndatacopy(zero, zero, returndatasize())

      // if the delegatecall succeeded, then return
      if success {
        return(zero, returndatasize())
      }
      // else revert
      revert(zero, returndatasize())
    }
  }
}

{
  "compilationTarget": {
    "src/rollup/contracts/RollupProxy.sol": "RollupProxy"
  },
  "evmVersion": "berlin",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "none"
  },
  "optimizer": {
    "details": {
      "constantOptimizer": true,
      "cse": true,
      "deduplicate": true,
      "jumpdestRemover": true,
      "orderLiterals": false,
      "peephole": true,
      "yul": false
    },
    "runs": 256
  },
  "remappings": []
}