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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {IBeaconChainOracle} from "./IBeaconChainOracle.sol";

/// @title EigenLayerBeaconOracle
/// @author Succinct Labs
contract EigenLayerBeaconOracle is IBeaconChainOracle {
    /// @notice The address of the beacon roots precompile.
    /// @dev https://eips.ethereum.org/EIPS/eip-4788
    address internal constant BEACON_ROOTS = 0x000F3df6D732807Ef1319fB7B8bB8522d0Beac02;

    /// @notice The maximum number of slots to search through to handle skipped slots.
    /// @dev This is 1 day worth of slots.
    uint256 internal constant MAX_SLOT_ATTEMPTS = 7200;

    /// @notice The size of the beacon block root ring buffer.
    uint256 internal constant BUFFER_LENGTH = 8191;

    /// @notice The timestamp to block root mapping.
    mapping(uint256 => bytes32) public timestampToBlockRoot;

    /// @notice The genesis block timestamp.
    uint256 public immutable GENESIS_BLOCK_TIMESTAMP;

    /// @notice The event emitted when a new block is added to the oracle.
    event EigenLayerBeaconOracleUpdate(uint256 slot, uint256 timestamp, bytes32 blockRoot);

    /// @notice Block timestamp does not correspond to a valid slot.
    error InvalidBlockTimestamp();

    /// @notice Timestamp out of range.
    error TimestampOutOfRange();

    constructor(
        uint256 _genesisBlockTimestamp
    ) {
        // Set the genesis block timestamp.
        GENESIS_BLOCK_TIMESTAMP = _genesisBlockTimestamp;
    }

    function addTimestamp(uint256 _targetTimestamp) external {
        // If the targetTimestamp is not guaranteed to be within the beacon block root ring buffer, revert.
        if ((block.timestamp - _targetTimestamp) >= (BUFFER_LENGTH * 12)) {
            revert TimestampOutOfRange();
        }

        // If _targetTimestamp corresponds to slot n, then the block root for slot n - 1 is returned.
        (bool success, ) = BEACON_ROOTS.staticcall(abi.encode(_targetTimestamp));

        if (!success) {
            revert InvalidBlockTimestamp();
        }

        uint256 slot = (_targetTimestamp - GENESIS_BLOCK_TIMESTAMP) / 12;

        // Find the block root for the target timestamp.
        bytes32 blockRoot = findBlockRoot(uint64(slot));

        // Add the block root to the mapping.
        timestampToBlockRoot[_targetTimestamp] = blockRoot;

        // Emit the event.
        emit EigenLayerBeaconOracleUpdate(slot, _targetTimestamp, blockRoot); 
    }

    /// @notice findBlockRoot takes a valid slot _targetSlot and returns the block root corresponding to _targetSlot.
    /// @param _targetSlot The slot to start searching from.
    /// @return blockRoot The beacon root of the first available slot found.
    /// @dev Given slot N+1's timestamp, BEACON_ROOTS returns the beacon block root corresponding to slot N.
    function findBlockRoot(uint64 _targetSlot)
        public
        view
        returns (bytes32 blockRoot)
    {
        uint64 currSlot = _targetSlot + 1;
        bool success;
        bytes memory result;

        for (uint64 i = 0; i < MAX_SLOT_ATTEMPTS; i++) {
            uint256 currTimestamp = GENESIS_BLOCK_TIMESTAMP + (currSlot * 12);
            (success, result) = BEACON_ROOTS.staticcall(abi.encode(currTimestamp));
            if (success && result.length > 0) {
                return (abi.decode(result, (bytes32)));
            }
            currSlot++;
        }

        revert("No available slot found");
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.5.0;

/**
 * @title Interface for the BeaconStateOracle contract.
 * @author Layr Labs, Inc.
 * @notice Terms of Service: https://docs.eigenlayer.xyz/overview/terms-of-service
 */
interface IBeaconChainOracle {
    /// @notice The block number to state root mapping.
    function timestampToBlockRoot(uint256 timestamp) external view returns (bytes32);
}

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

[{"inputs":[{"internalType":"uint256","name":"_genesisBlockTimestamp","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"InvalidBlockTimestamp","type":"error"},{"inputs":[],"name":"TimestampOutOfRange","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"slot","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"blockRoot","type":"bytes32"}],"name":"EigenLayerBeaconOracleUpdate","type":"event"},{"inputs":[],"name":"GENESIS_BLOCK_TIMESTAMP","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_targetTimestamp","type":"uint256"}],"name":"addTimestamp","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint64","name":"_targetSlot","type":"uint64"}],"name":"findBlockRoot","outputs":[{"internalType":"bytes32","name":"blockRoot","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"timestampToBlockRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000000000000000000000000000000000000065156ac0

-----Decoded View---------------
Arg [0] : _genesisBlockTimestamp (uint256): 1695902400

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000065156ac0