/*

 * Copyright (c) 2019, 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 build.tools.taglet;

import java.util.Arrays;

import java.util.EnumSet;

import java.util.List;

import java.util.Set;

import java.util.function.Predicate;

import javax.lang.model.element.Element;

import com.sun.source.doctree.DocTree;

import com.sun.source.doctree.TextTree;

import com.sun.source.doctree.UnknownInlineTagTree;

import jdk.javadoc.doclet.Taglet;

import static jdk.javadoc.doclet.Taglet.Location.*;

/**

 * An block tag to insert a standard warning about a preview API.

 */

public class Preview implements Taglet {

    /** Returns the set of locations in which a taglet may be used. */

    @Override

    public Set<Location> getAllowedLocations() {

        return EnumSet.of(MODULE, PACKAGE, TYPE, CONSTRUCTOR, METHOD, FIELD);

    }

    @Override

    public boolean isInlineTag() {

        return true;

    }

    @Override

    public String getName() {

        return "preview";

    }

    @Override

    public String toString(List<? extends DocTree> tags, Element elem) {

        UnknownInlineTagTree previewTag = (UnknownInlineTagTree) tags.get(0);

        List<? extends DocTree> previewContent = previewTag.getContent();

        String previewText = ((TextTree) previewContent.get(0)).getBody();

        String[] summaryAndDetails = previewText.split("\n\r?\n\r?");

        String summary = summaryAndDetails[0];

        String details = summaryAndDetails.length > 1 ? summaryAndDetails[1] : summaryAndDetails[0];

        StackTraceElement[] stackTrace = new Exception().getStackTrace();

        Predicate<StackTraceElement> isSummary =

                el -> el.getClassName().endsWith("HtmlDocletWriter") &&

                      el.getMethodName().equals("addSummaryComment");

        if (Arrays.stream(stackTrace).anyMatch(isSummary)) {

            return "<div style=\"display:inline-block; font-weight:bold\">" + summary + "</div><br>";

        }

        return "<div style=\"border: 1px solid red; border-radius: 5px; padding: 5px; display:inline-block; font-size: larger\">" + details + "</div><br>";

    }

}