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 * Copyright (c) 2003, 2022, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package org.jdrupes.mdoclet.internal.doclets.toolkit.builders;

import static org.jdrupes.mdoclet.internal.doclets.toolkit.util.VisibleMemberTable.Kind.*;

import java.util.*;

import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.VariableElement;

import org.jdrupes.mdoclet.internal.doclets.toolkit.BaseOptions;
import org.jdrupes.mdoclet.internal.doclets.toolkit.Content;
import org.jdrupes.mdoclet.internal.doclets.toolkit.DocletException;
import org.jdrupes.mdoclet.internal.doclets.toolkit.FieldWriter;

/**
 * Builds documentation for a field.
 */
public class FieldBuilder extends AbstractMemberBuilder {

    /**
     * The writer to output the field documentation.
     */
    private final FieldWriter writer;

    /**
     * The list of fields being documented.
     */
    private final List<? extends Element> fields;

    /**
     * The index of the current field that is being documented at this point
     * in time.
     */
    private VariableElement currentElement;

    /**
     * Construct a new FieldBuilder.
     *
     * @param context  the build context.
     * @param typeElement the class whose members are being documented.
     * @param writer the doclet specific writer.
     */
    private FieldBuilder(Context context,
            TypeElement typeElement,
            FieldWriter writer) {
        super(context, typeElement);
        this.writer = Objects.requireNonNull(writer);
        fields = getVisibleMembers(FIELDS);
    }

    /**
     * Construct a new FieldBuilder.
     *
     * @param context  the build context.
     * @param typeElement the class whose members are being documented.
     * @param writer the doclet specific writer.
     * @return the new FieldBuilder
     */
    public static FieldBuilder getInstance(Context context,
            TypeElement typeElement,
            FieldWriter writer) {
        return new FieldBuilder(context, typeElement, writer);
    }

    /**
     * Returns whether or not there are members to document.
     *
     * @return whether or not there are members to document
     */
    @Override
    public boolean hasMembersToDocument() {
        return !fields.isEmpty();
    }

    @Override
    public void build(Content target) throws DocletException {
        buildFieldDoc(target);
    }

    /**
     * Build the field documentation.
     *
     * @param target the content to which the documentation will be added
     * @throws DocletException if there is a problem while building the documentation
     */
    protected void buildFieldDoc(Content target) throws DocletException {
        if (!fields.isEmpty()) {
            Content fieldDetailsHeader = writer.getFieldDetailsHeader(target);
            Content memberList = writer.getMemberList();

            for (Element element : fields) {
                currentElement = (VariableElement) element;
                Content fieldContent
                    = writer.getFieldHeaderContent(currentElement);

                buildSignature(fieldContent);
                buildDeprecationInfo(fieldContent);
                buildPreviewInfo(fieldContent);
                buildFieldComments(fieldContent);
                buildTagInfo(fieldContent);

                memberList.add(writer.getMemberListItem(fieldContent));
            }
            Content fieldDetails
                = writer.getFieldDetails(fieldDetailsHeader, memberList);
            target.add(fieldDetails);
        }
    }

    /**
     * Build the signature.
     *
     * @param fieldContent the content to which the documentation will be added
     */
    protected void buildSignature(Content fieldContent) {
        fieldContent.add(writer.getSignature(currentElement));
    }

    /**
     * Build the deprecation information.
     *
     * @param fieldContent the content to which the documentation will be added
     */
    protected void buildDeprecationInfo(Content fieldContent) {
        writer.addDeprecated(currentElement, fieldContent);
    }

    /**
     * Build the preview information.
     *
     * @param fieldContent the content to which the documentation will be added
     */
    protected void buildPreviewInfo(Content fieldContent) {
        writer.addPreview(currentElement, fieldContent);
    }

    /**
     * Build the comments for the field.  Do nothing if
     * {@link BaseOptions#noComment()} is set to true.
     *
     * @param fieldContent the content to which the documentation will be added
     */
    protected void buildFieldComments(Content fieldContent) {
        if (!options.noComment()) {
            writer.addComments(currentElement, fieldContent);
        }
    }

    /**
     * Build the tag information.
     *
     * @param fieldContent the content to which the documentation will be added
     */
    protected void buildTagInfo(Content fieldContent) {
        writer.addTags(currentElement, fieldContent);
    }

    /**
     * Return the field writer for this builder.
     *
     * @return the field writer for this builder.
     */
    public FieldWriter getWriter() {
        return writer;
    }
}