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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.16;

import {IFunctionGateway} from "succinctx/interfaces/IFunctionGateway.sol";
import {OutputReader} from "./OutputReader.sol";

contract LightClient {
    bytes32 public immutable GENESIS_VALIDATORS_ROOT;
    uint256 public immutable GENESIS_TIME;
    uint256 public immutable SECONDS_PER_SLOT;
    uint256 public immutable SLOTS_PER_PERIOD;
    uint32 public immutable SOURCE_CHAIN_ID;
    uint16 public immutable FINALITY_THRESHOLD;
    bytes32 public immutable STEP_FUNCTION_ID;
    bytes32 public immutable ROTATE_FUNCTION_ID;
    address public immutable FUNCTION_GATEWAY_ADDRESS;

    uint256 internal constant MIN_SYNC_COMMITTEE_PARTICIPANTS = 10;
    uint256 internal constant SYNC_COMMITTEE_SIZE = 512;
    uint256 internal constant FINALIZED_ROOT_INDEX = 105;
    uint256 internal constant NEXT_SYNC_COMMITTEE_INDEX = 55;
    uint256 internal constant EXECUTION_STATE_ROOT_INDEX = 402;

    /// @notice The latest slot the light client has a finalized header for.
    uint256 public head = 0;

    /// @notice Maps from a slot to a beacon block header root.
    mapping(uint256 => bytes32) public headers;

    /// @notice Maps from a slot to the timestamp of when the headers mapping was updated with slot as a key
    mapping(uint256 => uint256) public timestamps;

    /// @notice Maps from a slot to the current finalized ethereum1 execution state root.
    mapping(uint256 => bytes32) public executionStateRoots;

    /// @notice Maps from a period to the poseidon commitment for the sync committee.
    mapping(uint256 => bytes32) public syncCommitteePoseidons;

    event HeadUpdate(uint256 indexed slot, bytes32 indexed root);
    event SyncCommitteeUpdate(uint256 indexed period, bytes32 indexed root);

    error SyncCommitteeNotSet(uint256 period);
    error HeaderRootNotSet(uint256 slot);
    error SlotBehindHead(uint64 slot);
    error NotEnoughParticipation(uint16 participation);
    error SyncCommitteeAlreadySet(uint256 period);
    error HeaderRootAlreadySet(uint256 slot);
    error StateRootAlreadySet(uint256 slot);

    constructor(
        bytes32 genesisValidatorsRoot,
        uint256 genesisTime,
        uint256 secondsPerSlot,
        uint256 slotsPerPeriod,
        uint256 syncCommitteePeriod,
        bytes32 syncCommitteePoseidon,
        uint32 sourceChainId,
        uint16 finalityThreshold,
        bytes32 stepFunctionId,
        bytes32 rotateFunctionId,
        address gatewayAddress
    ) {
        GENESIS_VALIDATORS_ROOT = genesisValidatorsRoot;
        GENESIS_TIME = genesisTime;
        SECONDS_PER_SLOT = secondsPerSlot;
        SLOTS_PER_PERIOD = slotsPerPeriod;
        SOURCE_CHAIN_ID = sourceChainId;
        FINALITY_THRESHOLD = finalityThreshold;
        STEP_FUNCTION_ID = stepFunctionId;
        ROTATE_FUNCTION_ID = rotateFunctionId;
        FUNCTION_GATEWAY_ADDRESS = gatewayAddress;

        setSyncCommitteePoseidon(syncCommitteePeriod, syncCommitteePoseidon);
    }

    /// @notice Through the FunctionGateway, request for a step proof to be generated with the given attested slot number as the input.
    function requestStep(uint256 attestedSlot) external payable {
        IFunctionGateway(FUNCTION_GATEWAY_ADDRESS).requestCall{value: msg.value}(
            STEP_FUNCTION_ID,
            abi.encodePacked(
                syncCommitteePoseidons[getSyncCommitteePeriod(attestedSlot)], uint64(attestedSlot)
            ),
            address(this),
            abi.encodeWithSelector(this.step.selector, attestedSlot),
            1000000
        );
    }

    /// @notice Through the FunctionGateway, request for a rotate proof to be generated with the given finalized slot number as the input.
    function requestRotate(uint256 finalizedSlot) external payable {
        IFunctionGateway(FUNCTION_GATEWAY_ADDRESS).requestCall{value: msg.value}(
            ROTATE_FUNCTION_ID,
            abi.encodePacked(headers[finalizedSlot]),
            address(this),
            abi.encodeWithSelector(this.rotate.selector, finalizedSlot),
            1000000
        );
    }

    /// @notice Process a step proof that has been verified in the FunctionGateway, then move the head forward and store the new roots.
    function step(uint256 attestedSlot) external {
        uint256 period = getSyncCommitteePeriod(attestedSlot);
        bytes32 syncCommitteePoseidon = syncCommitteePoseidons[period];
        if (syncCommitteePoseidon == bytes32(0)) {
            revert SyncCommitteeNotSet(period);
        }

        // Input: [uint256 syncCommitteePoseidon, uint64 attestedSlot]
        // Output: [bytes32 finalizedHeaderRoot, bytes32 executionStateRoot, uint64 finalizedSlot, uint16 participation]
        bytes memory output = IFunctionGateway(FUNCTION_GATEWAY_ADDRESS).verifiedCall(
            STEP_FUNCTION_ID, abi.encodePacked(syncCommitteePoseidon, uint64(attestedSlot))
        );
        bytes32 finalizedHeaderRoot = bytes32(OutputReader.readUint256(output, 0));
        bytes32 executionStateRoot = bytes32(OutputReader.readUint256(output, 32));
        uint64 finalizedSlot = OutputReader.readUint64(output, 64);
        uint16 participation = OutputReader.readUint16(output, 72);

        if (participation < FINALITY_THRESHOLD) {
            revert NotEnoughParticipation(participation);
        }

        if (finalizedSlot <= head) {
            revert SlotBehindHead(finalizedSlot);
        }

        setSlotRoots(uint256(finalizedSlot), finalizedHeaderRoot, executionStateRoot);
    }

    /// @notice Process a rotate proof that has been verified in the FunctionGateway, then store the next sync committee poseidon.
    function rotate(uint256 finalizedSlot) external {
        bytes32 finalizedHeaderRoot = headers[finalizedSlot];
        if (finalizedHeaderRoot == bytes32(0)) {
            revert HeaderRootNotSet(finalizedSlot);
        }

        // Input: [bytes32 finalizedHeaderRoot]
        // Output: [bytes32 syncCommitteePoseidon]
        bytes memory output = IFunctionGateway(FUNCTION_GATEWAY_ADDRESS).verifiedCall(
            ROTATE_FUNCTION_ID, abi.encodePacked(finalizedHeaderRoot)
        );
        bytes32 syncCommitteePoseidon = bytes32(OutputReader.readUint256(output, 0));

        uint256 period = getSyncCommitteePeriod(finalizedSlot);
        uint256 nextPeriod = period + 1;
        setSyncCommitteePoseidon(nextPeriod, syncCommitteePoseidon);
    }

    /// @notice Gets the sync committee period from a slot.
    function getSyncCommitteePeriod(uint256 slot) internal view returns (uint256) {
        return slot / SLOTS_PER_PERIOD;
    }

    /// @notice Gets the current slot for the chain the light client is reflecting.
    function getCurrentSlot() internal view returns (uint256) {
        return (block.timestamp - GENESIS_TIME) / SECONDS_PER_SLOT;
    }

    /// @notice Sets the current slot for the chain the light client is reflecting.
    /// @dev Checks if roots exists for the slot already. If there is, check for a conflict between
    ///      the given roots and the existing roots. If there is an existing header but no
    ///      conflict, do nothing. This avoids timestamp renewal DoS attacks.
    function setSlotRoots(uint256 slot, bytes32 finalizedHeaderRoot, bytes32 executionStateRoot)
        internal
    {
        if (headers[slot] != bytes32(0)) {
            revert HeaderRootAlreadySet(slot);
        }
        if (executionStateRoots[slot] != bytes32(0)) {
            revert StateRootAlreadySet(slot);
        }
        head = slot;
        headers[slot] = finalizedHeaderRoot;
        executionStateRoots[slot] = executionStateRoot;
        timestamps[slot] = block.timestamp;
        emit HeadUpdate(slot, finalizedHeaderRoot);
    }

    /// @notice Sets the sync committee poseidon for a given period.
    function setSyncCommitteePoseidon(uint256 period, bytes32 poseidon) internal {
        if (syncCommitteePoseidons[period] != bytes32(0)) {
            revert SyncCommitteeAlreadySet(period);
        }
        syncCommitteePoseidons[period] = poseidon;
        emit SyncCommitteeUpdate(period, poseidon);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

interface IFunctionGatewayEvents {
    event RequestCallback(
        uint32 indexed nonce,
        bytes32 indexed functionId,
        bytes input,
        bytes context,
        address callbackAddress,
        bytes4 callbackSelector,
        uint32 callbackGasLimit,
        uint256 feeAmount
    );
    event RequestCall(
        bytes32 indexed functionId,
        bytes input,
        address entryAddress,
        bytes entryCalldata,
        uint32 entryGasLimit,
        address sender,
        uint256 feeAmount
    );
    event RequestFulfilled(
        uint32 indexed nonce, bytes32 indexed functionId, bytes32 inputHash, bytes32 outputHash
    );
    event Call(bytes32 indexed functionId, bytes32 inputHash, bytes32 outputHash);
}

interface IFunctionGatewayErrors {
    error InvalidRequest(uint32 nonce, bytes32 expectedRequestHash, bytes32 requestHash);
    error CallbackFailed(bytes4 callbackSelector, bytes output, bytes context);
    error InvalidCall(bytes32 functionId, bytes input);
    error CallFailed(address callbackAddress, bytes callbackData);
    error InvalidProof(address verifier, bytes32 inputHash, bytes32 outputHash, bytes proof);
}

interface IFunctionGateway is IFunctionGatewayEvents, IFunctionGatewayErrors {
    function requestCallback(
        bytes32 _functionId,
        bytes memory _input,
        bytes memory _context,
        bytes4 _callbackSelector,
        uint32 _callbackGasLimit
    ) external payable returns (bytes32);

    function requestCall(
        bytes32 _functionId,
        bytes memory _input,
        address _entryAddress,
        bytes memory _entryData,
        uint32 _entryGasLimit
    ) external payable;

    function verifiedCall(bytes32 _functionId, bytes memory _input)
        external
        view
        returns (bytes memory);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.16;

library OutputReader {
    function readUint256(bytes memory _output, uint256 _offset) internal pure returns (uint256) {
        uint256 value;
        assembly {
            value := mload(add(add(_output, 0x20), _offset))
        }
        return value;
    }

    function readUint128(bytes memory _output, uint256 _offset) internal pure returns (uint128) {
        uint128 value;
        assembly {
            value := mload(add(add(_output, 0x10), _offset))
        }
        return value;
    }

    function readUint64(bytes memory _output, uint256 _offset) internal pure returns (uint64) {
        uint64 value;
        assembly {
            value := mload(add(add(_output, 0x08), _offset))
        }
        return value;
    }

    function readUint32(bytes memory _output, uint256 _offset) internal pure returns (uint32) {
        uint32 value;
        assembly {
            value := mload(add(add(_output, 0x04), _offset))
        }
        return value;
    }

    function readUint16(bytes memory _output, uint256 _offset) internal pure returns (uint16) {
        uint16 value;
        assembly {
            value := mload(add(add(_output, 0x02), _offset))
        }
        return value;
    }
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/succinctx/contracts/lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts-upgradeable/=lib/succinctx/contracts/lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/succinctx/contracts/lib/openzeppelin-contracts/",
    "safe-contracts/=lib/succinctx/contracts/lib/safe-contracts/",
    "succinctx/=lib/succinctx/contracts/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "libraries": {}
}

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-----Decoded View---------------
Arg [0] : genesisValidatorsRoot (bytes32): 0x4b363db94e286120d76eb905340fdd4e54bfe9f06bf33ff6cf5ad27f511bfe95
Arg [1] : genesisTime (uint256): 1606824023
Arg [2] : secondsPerSlot (uint256): 12
Arg [3] : slotsPerPeriod (uint256): 8192
Arg [4] : syncCommitteePeriod (uint256): 931
Arg [5] : syncCommitteePoseidon (bytes32): 0x0ab2afdc05c8b6ae1f2ab20874fb4159e25d5c1d4faa41aee232d6ab331332df
Arg [6] : sourceChainId (uint32): 1
Arg [7] : finalityThreshold (uint16): 342
Arg [8] : stepFunctionId (bytes32): 0xaf44af6890508b3b7f6910d4a4570a0d524769a23ce340b2c7400e140ad168ab
Arg [9] : rotateFunctionId (bytes32): 0x9aed23f9e6e8f8b98751cf508069b5b7f015d4d510b6a4820d41ba1ce88190d9
Arg [10] : gatewayAddress (address): 0x6e4f1e9eA315EBFd69d18C2DB974EEf6105FB803

-----Encoded View---------------
11 Constructor Arguments found :
Arg [0] : 4b363db94e286120d76eb905340fdd4e54bfe9f06bf33ff6cf5ad27f511bfe95
Arg [1] : 000000000000000000000000000000000000000000000000000000005fc63057
Arg [2] : 000000000000000000000000000000000000000000000000000000000000000c
Arg [3] : 0000000000000000000000000000000000000000000000000000000000002000
Arg [4] : 00000000000000000000000000000000000000000000000000000000000003a3
Arg [5] : 0ab2afdc05c8b6ae1f2ab20874fb4159e25d5c1d4faa41aee232d6ab331332df
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000156
Arg [8] : af44af6890508b3b7f6910d4a4570a0d524769a23ce340b2c7400e140ad168ab
Arg [9] : 9aed23f9e6e8f8b98751cf508069b5b7f015d4d510b6a4820d41ba1ce88190d9
Arg [10] : 0000000000000000000000006e4f1e9ea315ebfd69d18c2db974eef6105fb803