001/*
002 * SPDX-License-Identifier: Apache-2.0
003 *
004 * Copyright 2025-2026 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.common.template.tool;
019
020import com.google.common.collect.ImmutableMap;
021
022import dev.enola.common.io.object.ObjectReader;
023import dev.enola.common.io.resource.ReadableResource;
024import dev.enola.common.io.resource.WritableResource;
025import dev.enola.common.template.TemplateProvider;
026
027import java.io.IOException;
028import java.util.Map;
029
030public class Temply {
031
032    private final ObjectReader objectReader;
033    private final TemplateProvider templateProvider;
034
035    public Temply(ObjectReader objectReader, TemplateProvider templateProvider) {
036        this.objectReader = objectReader;
037        this.templateProvider = templateProvider;
038    }
039
040    @SuppressWarnings("unchecked") // Due to ObjectReader API using Class<T> without TypeReference
041    public void convert(
042            Iterable<? extends ReadableResource> dataResources,
043            ReadableResource templateResource,
044            WritableResource into)
045            throws IOException {
046
047        var mapBuilder = ImmutableMap.<String, Object>builder();
048        for (var dataResource : dataResources) {
049            mapBuilder.putAll(objectReader.read(dataResource, Map.class));
050        }
051
052        objectReader.optional(templateResource, Map.class).ifPresent(map -> mapBuilder.putAll(map));
053
054        var allDataMap = mapBuilder.build();
055        var template = templateProvider.get(templateResource);
056        try (var appendable = into.charSink().openBufferedStream()) {
057            template.apply(allDataMap, appendable);
058        }
059    }
060}