// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.18;

import "./SmartAssetBase.sol";
import "../Interfaces/ISmartAssetUpdatable.sol";

/**
 * @title SmartAssetUpdatable.
 * @author Arianee - Dynamic NFTs for real-world use cases and consumer engagement (www.arianee.org).
 */
abstract contract SmartAssetUpdatable is SmartAssetBase, ISmartAssetUpdatable {
    /**
     * @notice Mapping from token id to its last update.
     */
    mapping(uint256 => TokenUpdate) internal idToLastUpdate;

    /**
     * @notice This emits when a token is updated.
     */
    event TokenUpdated(uint256 indexed tokenId, bytes32 indexed imprint);

    /**
     * Update a token imprint.
     * @param tokenId The token ID.
     * @param newImprint The new token imprint.
     */
    function updateToken(uint256 tokenId, bytes32 newImprint) external isIssuer(tokenId) {
        _requireMinted(tokenId);

        idToLastUpdate[tokenId] = TokenUpdate({imprint: newImprint, updateTimestamp: block.timestamp});
        emit TokenUpdated(tokenId, newImprint);
    }

    /**
     * @notice Try to retrieve the last update of a given token.
     * @dev Throws if the token is not minted.
     * @param tokenId The token ID.
     * @return The last update of the token if any.
     */
    function getLastUpdateOf(uint256 tokenId) public view returns (TokenUpdate memory) {
        _requireMinted(tokenId);
        return idToLastUpdate[tokenId];
    }

    /**
     * @notice Try to retrieve the last imprint of a given token.
     * @dev If the token has never been updated, the original imprint is returned.
     * @param tokenId The token ID.
     * @return The last imprint of the token.
     */
    function getLastImprintOf(uint256 tokenId) public view returns (bytes32) {
        TokenUpdate memory lastUpdate = getLastUpdateOf(tokenId);
        if (lastUpdate.updateTimestamp == 0) {
            return super.imprintOf(tokenId);
        } else {
            return lastUpdate.imprint;
        }
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(ISmartAssetUpdatable).interfaceId || super.supportsInterface(interfaceId);
    }
}