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/*
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              Made with ❤️ by Gnosis Guild & the Cross-chain Alliance
*/
// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity ^0.8.20;

import { IAdapter } from "./interfaces/IAdapter.sol";
import { IHashi } from "./interfaces/IHashi.sol";

contract Hashi is IHashi {
    /// @inheritdoc IHashi
    function checkHashWithThresholdFromAdapters(
        uint256 domain,
        uint256 id,
        uint256 threshold,
        IAdapter[] calldata adapters
    ) external view returns (bool) {
        if (threshold > adapters.length || threshold == 0) revert InvalidThreshold(threshold, adapters.length);
        bytes32[] memory hashes = getHashesFromAdapters(domain, id, adapters);

        for (uint256 i = 0; i < hashes.length; ) {
            if (i > hashes.length - threshold) break;

            bytes32 baseHash = hashes[i];
            if (baseHash == bytes32(0)) {
                unchecked {
                    ++i;
                }
                continue;
            }

            uint256 num = 0;
            for (uint256 j = i; j < hashes.length; ) {
                if (baseHash == hashes[j]) {
                    unchecked {
                        ++num;
                    }
                    if (num == threshold) return true;
                }
                unchecked {
                    ++j;
                }
            }

            unchecked {
                ++i;
            }
        }
        return false;
    }

    /// @inheritdoc IHashi
    function getHashFromAdapter(uint256 domain, uint256 id, IAdapter adapter) external view returns (bytes32) {
        return adapter.getHash(domain, id);
    }

    /// @inheritdoc IHashi
    function getHashesFromAdapters(
        uint256 domain,
        uint256 id,
        IAdapter[] calldata adapters
    ) public view returns (bytes32[] memory) {
        if (adapters.length == 0) revert NoAdaptersGiven();
        bytes32[] memory hashes = new bytes32[](adapters.length);
        for (uint256 i = 0; i < adapters.length; ) {
            hashes[i] = adapters[i].getHash(domain, id);
            unchecked {
                ++i;
            }
        }
        return hashes;
    }

    /// @inheritdoc IHashi
    function getHash(uint256 domain, uint256 id, IAdapter[] calldata adapters) external view returns (bytes32 hash) {
        if (adapters.length == 0) revert NoAdaptersGiven();
        bytes32[] memory hashes = getHashesFromAdapters(domain, id, adapters);
        hash = hashes[0];
        if (hash == bytes32(0)) revert HashNotAvailableInAdapter(adapters[0]);
        for (uint256 i = 1; i < hashes.length; ) {
            if (hashes[i] == bytes32(0)) revert HashNotAvailableInAdapter(adapters[i]);
            if (hash != hashes[i]) revert AdaptersDisagree(adapters[i - 1], adapters[i]);
            unchecked {
                ++i;
            }
        }
    }
}

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

/**
 * @title IAdapter
 */
interface IAdapter {
    error ConflictingBlockHeader(uint256 blockNumber, bytes32 blockHash, bytes32 storedBlockHash);
    error InvalidBlockHeaderLength(uint256 length);
    error InvalidBlockHeaderRLP();

    /**
     * @dev Emitted when a hash is stored.
     * @param id - The ID of the stored hash.
     * @param hash - The stored hash as bytes32 values.
     */
    event HashStored(uint256 indexed id, bytes32 indexed hash);

    /**
     * @dev Returns the hash for a given ID.
     * @param domain - Identifier for the domain to query.
     * @param id - Identifier for the ID to query.
     * @return hash Bytes32 hash for the given ID on the given domain.
     * @notice MUST return bytes32(0) if the hash is not present.
     */
    function getHash(uint256 domain, uint256 id) external view returns (bytes32 hash);
}

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

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

/**
 * @title IHashi
 */
interface IHashi {
    error AdaptersDisagree(IAdapter adapterOne, IAdapter adapterTwo);
    error HashNotAvailableInAdapter(IAdapter adapter);
    error InvalidThreshold(uint256 threshold, uint256 maxThreshold);
    error NoAdaptersGiven();

    /**
     * @dev Checks whether the threshold is reached for a message given a set of adapters.
     * @param domain - ID of the domain to query.
     * @param id - ID for which to return hash.
     * @param threshold - Threshold to use.
     * @param adapters - Array of addresses for the adapters to query.
     * @notice If the threshold is 1, it will always return true.
     * @return result A boolean indicating if a threshold for a given message has been reached.
     */
    function checkHashWithThresholdFromAdapters(
        uint256 domain,
        uint256 id,
        uint256 threshold,
        IAdapter[] calldata adapters
    ) external view returns (bool);

    /**
     * @dev Returns the hash stored by a given adapter for a given ID.
     * @param domain - ID of the domain to query.
     * @param id - ID for which to return a hash.
     * @param adapter - Address of the adapter to query.
     * @return hash stored by the given adapter for the given ID.
     */
    function getHashFromAdapter(uint256 domain, uint256 id, IAdapter adapter) external view returns (bytes32);

    /**
     * @dev Returns the hashes for a given ID stored by a given set of adapters.
     * @param domain - The ID of the domain to query.
     * @param id - The ID for which to return hashes.
     * @param adapters - An array of addresses for the adapters to query.
     * @return hashes An array of hashes stored by the given adapters for the specified ID.
     */
    function getHashesFromAdapters(
        uint256 domain,
        uint256 id,
        IAdapter[] calldata adapters
    ) external view returns (bytes32[] memory);

    /**
     * @dev Returns the hash unanimously agreed upon by a given set of adapters.
     * @param domain - The ID of the domain to query.
     * @param id - The ID for which to return a hash.
     * @param adapters - An array of addresses for the adapters to query.
     * @return hash agreed on by the given set of adapters.
     * @notice MUST revert if adapters disagree on the hash or if an adapter does not report.
     */
    function getHash(uint256 domain, uint256 id, IAdapter[] calldata adapters) external view returns (bytes32);
}

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

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[{"inputs":[{"internalType":"contract IAdapter","name":"adapterOne","type":"address"},{"internalType":"contract IAdapter","name":"adapterTwo","type":"address"}],"name":"AdaptersDisagree","type":"error"},{"inputs":[{"internalType":"contract IAdapter","name":"adapter","type":"address"}],"name":"HashNotAvailableInAdapter","type":"error"},{"inputs":[{"internalType":"uint256","name":"threshold","type":"uint256"},{"internalType":"uint256","name":"maxThreshold","type":"uint256"}],"name":"InvalidThreshold","type":"error"},{"inputs":[],"name":"NoAdaptersGiven","type":"error"},{"inputs":[{"internalType":"uint256","name":"domain","type":"uint256"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"threshold","type":"uint256"},{"internalType":"contract IAdapter[]","name":"adapters","type":"address[]"}],"name":"checkHashWithThresholdFromAdapters","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"domain","type":"uint256"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"contract IAdapter[]","name":"adapters","type":"address[]"}],"name":"getHash","outputs":[{"internalType":"bytes32","name":"hash","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"domain","type":"uint256"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"contract IAdapter","name":"adapter","type":"address"}],"name":"getHashFromAdapter","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"domain","type":"uint256"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"contract IAdapter[]","name":"adapters","type":"address[]"}],"name":"getHashesFromAdapters","outputs":[{"internalType":"bytes32[]","name":"","type":"bytes32[]"}],"stateMutability":"view","type":"function"}]

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