001/*
002 * SPDX-License-Identifier: Apache-2.0
003 *
004 * Copyright 2024-2026 The Enola <https://enola.dev> Authors
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 *     https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package dev.enola.core.rosetta;
019
020import dev.enola.common.io.resource.ReadableResource;
021import dev.enola.common.io.resource.ResourceProvider;
022import dev.enola.common.io.resource.WritableResource;
023import dev.enola.common.io.resource.convert.CatchingResourceConverter;
024import dev.enola.common.protobuf.ProtoIO;
025import dev.enola.rdf.io.RdfResourceIntoProtoThingConverter;
026import dev.enola.thing.io.ThingMediaTypes;
027
028public class RdfResourceIntoProtoThingResourceConverter implements CatchingResourceConverter {
029
030    private final ThingMediaTypes thingMediaTypes = new ThingMediaTypes();
031    private final RdfResourceIntoProtoThingConverter ritc;
032    private final ProtoIO protoIO = new ProtoIO();
033
034    public RdfResourceIntoProtoThingResourceConverter(ResourceProvider rp) {
035        this.ritc = new RdfResourceIntoProtoThingConverter(rp);
036    }
037
038    @Override
039    public boolean convertIntoThrows(ReadableResource from, WritableResource into)
040            throws Exception {
041        if (!(thingMediaTypes.knownTypesWithAlternatives().containsKey(into.mediaType())))
042            return false;
043        var intoMediaType = thingMediaTypes.detect(into);
044        if (intoMediaType.isPresent()) {
045            var optThingsList = ritc.convert(from);
046            if (optThingsList.isEmpty()) return false;
047
048            // if (ThingMediaTypes.THING_HTML_UTF_8.equals(intoMediaType.get())) {
049            // TODO Convert Thing to HTML fragment! (Test if mkdocs allows embedding HTML?)
050
051            // } else {
052            var thingsList = optThingsList.get();
053            var message = ritc.asMessage(thingsList).build();
054            protoIO.write(message, into);
055            // }
056            return true;
057        } else {
058            return false;
059        }
060    }
061}