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A CBOR-based serialization for Linked Data
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/*
 * Copyright 2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.apicatalog.cborld.context;

import java.net.URI;
import java.util.Collection;
import java.util.function.Consumer;

import com.apicatalog.cborld.db.TypeKeyNameMapper;
import com.apicatalog.cursor.ArrayCursor;
import com.apicatalog.cursor.ValueCursor;
import com.apicatalog.jsonld.JsonLdError;
import com.apicatalog.jsonld.context.ActiveContext;
import com.apicatalog.jsonld.json.JsonUtils;

import jakarta.json.Json;
import jakarta.json.JsonArray;
import jakarta.json.JsonArrayBuilder;
import jakarta.json.JsonValue;

final class ArrayExpansion {

    // mandatory
    private ActiveContext activeContext;
    private ArrayCursor element;
    private String activeProperty;
    private URI baseUrl;
    
    private final Consumer> appliedContexts;
    private final TypeKeyNameMapper typeMapper;

    // optional
    private boolean ordered;
    private boolean fromMap;

    private ArrayExpansion(final ActiveContext activeContext, final ArrayCursor element, final String activeProperty,
            final URI baseUrl, Consumer> appliedContexts, TypeKeyNameMapper typeMapper) {
        this.activeContext = activeContext;
        this.element = element;
        this.activeProperty = activeProperty;
        this.baseUrl = baseUrl;
        
        this.appliedContexts = appliedContexts;
        this.typeMapper = typeMapper;

        // default values
        this.ordered = false;
        this.fromMap = false;
    }

    public static final ArrayExpansion with(final ActiveContext activeContext, final ArrayCursor element,
            final String activeProperty, final URI baseUrl, Consumer> appliedContexts, TypeKeyNameMapper typeMapper) {
        return new ArrayExpansion(activeContext, element, activeProperty, baseUrl, appliedContexts, typeMapper);
    }

    public ArrayExpansion ordered(boolean value) {
        this.ordered = value;
        return this;
    }

    public ArrayExpansion fromMap(boolean value) {
        this.fromMap = value;
        return this;
    }

    public JsonArray expand() throws JsonLdError {

        if (element.isEmpty()) {
            return JsonValue.EMPTY_JSON_ARRAY; 
        }
        
        final JsonArrayBuilder result = Json.createArrayBuilder();
        
        // 5.2.
        for (final ValueCursor item : element) {

            // 5.2.1
            JsonValue expanded =
                            Expansion
                                .with(activeContext, item, activeProperty, baseUrl, appliedContexts, typeMapper)
                                .ordered(ordered)
                                .fromMap(fromMap)
                                .compute();

            // 5.2.3
            if (JsonUtils.isArray(expanded)) {

                // append array
                expanded
                    .asJsonArray()
                    .stream()
                    .filter(JsonUtils::isNotNull)
                    .forEach(result::add);

            // append non-null element
            } else if (JsonUtils.isNotNull(expanded)) {
                result.add(expanded);
            }
        }

        element.parent();

        // 5.3
        return result.build();
    }
}