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// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity ^0.8.20;

import { IHeaderStorage } from "../interfaces/IHeaderStorage.sol";

contract HeaderStorage is IHeaderStorage {
    mapping(uint256 => bytes32) public headers;

    /// @inheritdoc IHeaderStorage
    function storeBlockHeader(uint256 blockNumber) public returns (bytes32) {
        bytes32 blockHeader = headers[blockNumber];
        if (blockHeader == 0) {
            blockHeader = blockhash(blockNumber);
            if (blockHeader == 0) revert HeaderOutOfRange(blockNumber);
            headers[blockNumber] = blockHeader;
            emit HeaderStored(blockNumber, blockHeader);
        }
        return blockHeader;
    }

    /// @inheritdoc IHeaderStorage
    function storeBlockHeaders(uint256[] memory blockNumbers) public returns (bytes32[] memory) {
        bytes32[] memory blockHeaders = new bytes32[](blockNumbers.length);
        for (uint256 i = 0; i < blockNumbers.length; ) {
            blockHeaders[i] = storeBlockHeader(blockNumbers[i]);
            unchecked {
                ++i;
            }
        }
        return blockHeaders;
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity ^0.8.0;

/**
 * @title IHeaderStorage
 */
interface IHeaderStorage {
    error HeaderOutOfRange(uint256 blockNumber);

    /**
     * @dev Emitted when a block header is stored.
     * @param blockNumber - The block number associated with the stored header.
     * @param blockHeader - The stored block header as a bytes32 value.
     */
    event HeaderStored(uint256 indexed blockNumber, bytes32 indexed blockHeader);

    /**
     * @dev Retrieves the stored block header for a specific block number.
     * @param blockNumber - The block number as a uint256 value.
     * @return The block header as a bytes32 value.
     */
    function headers(uint256 blockNumber) external view returns (bytes32);

    /**
     * @dev Stores and returns the header for the given block.
     * @param blockNumber - Block number.
     * @return blockHeader - Block header stored.
     * @notice Reverts if the given block header was not previously stored and is now out of range.
     */
    function storeBlockHeader(uint256 blockNumber) external returns (bytes32);

    /**
     * @dev Stores and returns the header for an array of given blocks.
     * @param blockNumbers - Array of block numbers.
     * @return blockHeaders - Array of block headers stored.
     * @notice Reverts if the given block header was not previously stored and is now out of range.
     */
    function storeBlockHeaders(uint256[] memory blockNumbers) external returns (bytes32[] memory);
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

[{"inputs":[{"internalType":"uint256","name":"blockNumber","type":"uint256"}],"name":"HeaderOutOfRange","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"blockNumber","type":"uint256"},{"indexed":true,"internalType":"bytes32","name":"blockHeader","type":"bytes32"}],"name":"HeaderStored","type":"event"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"headers","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"blockNumber","type":"uint256"}],"name":"storeBlockHeader","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"blockNumbers","type":"uint256[]"}],"name":"storeBlockHeaders","outputs":[{"internalType":"bytes32[]","name":"","type":"bytes32[]"}],"stateMutability":"nonpayable","type":"function"}]

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