// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

import "./IABIResolver.sol";
import "../ResolverBase.sol";

abstract contract ABIResolver is IABIResolver, ResolverBase {
    mapping(uint64 => mapping(bytes32 => mapping(uint256 => bytes))) versionable_abis;

    /// Sets the ABI associated with an ENS node.
    /// Nodes may have one ABI of each content type. To remove an ABI, set it to
    /// the empty string.
    /// @param node The node to update.
    /// @param contentType The content type of the ABI
    /// @param data The ABI data.
    function setABI(
        bytes32 node,
        uint256 contentType,
        bytes calldata data
    ) external virtual authorised(node) {
        // Content types must be powers of 2
        require(((contentType - 1) & contentType) == 0);

        versionable_abis[recordVersions[node]][node][contentType] = data;
        emit ABIChanged(node, contentType);
    }

    /// Returns the ABI associated with an ENS node.
    /// Defined in EIP205.
    /// @param node The ENS node to query
    /// @param contentTypes A bitwise OR of the ABI formats accepted by the caller.
    /// @return contentType The content type of the return value
    /// @return data The ABI data
    function ABI(
        bytes32 node,
        uint256 contentTypes
    ) external view virtual override returns (uint256, bytes memory) {
        mapping(uint256 => bytes) storage abiset = versionable_abis[
            recordVersions[node]
        ][node];

        for (
            uint256 contentType = 1;
            contentType > 0 && contentType <= contentTypes;
            contentType <<= 1
        ) {
            if (
                (contentType & contentTypes) != 0 &&
                abiset[contentType].length > 0
            ) {
                return (contentType, abiset[contentType]);
            }
        }

        return (0, bytes(""));
    }

    function supportsInterface(
        bytes4 interfaceID
    ) public view virtual override returns (bool) {
        return
            interfaceID == type(IABIResolver).interfaceId ||
            super.supportsInterface(interfaceID);
    }
}