/*

 * Copyright (c) 2005, 2017, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.javac.api;

import java.util.Collection;

import java.util.LinkedHashSet;

import java.util.Locale;

import java.util.Objects;

import java.util.ServiceLoader;

import java.util.Set;

import java.util.stream.Collectors;

import javax.annotation.processing.Processor;

import javax.lang.model.element.Element;

import javax.lang.model.type.TypeMirror;

import javax.lang.model.util.Elements;

import javax.lang.model.util.Types;

import javax.tools.JavaFileObject;

import com.sun.source.tree.CompilationUnitTree;

import com.sun.source.tree.Tree;

import com.sun.source.util.JavacTask;

import com.sun.source.util.Plugin;

import com.sun.source.util.TaskListener;

import com.sun.tools.doclint.DocLint;

import com.sun.tools.javac.main.JavaCompiler;

import com.sun.tools.javac.model.JavacElements;

import com.sun.tools.javac.model.JavacTypes;

import com.sun.tools.javac.platform.PlatformDescription;

import com.sun.tools.javac.platform.PlatformDescription.PluginInfo;

import com.sun.tools.javac.processing.JavacProcessingEnvironment;

import com.sun.tools.javac.tree.JCTree;

import com.sun.tools.javac.util.Context;

import com.sun.tools.javac.util.DefinedBy;

import com.sun.tools.javac.util.DefinedBy.Api;

import com.sun.tools.javac.util.List;

import com.sun.tools.javac.util.Log;

import com.sun.tools.javac.util.PropagatedException;

/**

 * Provides basic functionality for implementations of JavacTask.

 *

 * <p><b>This is NOT part of any supported API.

 * If you write code that depends on this, you do so at your own

 * risk.  This code and its internal interfaces are subject to change

 * or deletion without notice.</b></p>

 */

public class BasicJavacTask extends JavacTask {

    protected Context context;

    private TaskListener taskListener;

    public static JavacTask instance(Context context) {

        JavacTask instance = context.get(JavacTask.class);

        if (instance == null)

            instance = new BasicJavacTask(context, true);

        return instance;

    }

    public BasicJavacTask(Context c, boolean register) {

        context = c;

        if (register)

            context.put(JavacTask.class, this);

    }

    @Override @DefinedBy(Api.COMPILER_TREE)

    public Iterable<? extends CompilationUnitTree> parse() {

        throw new IllegalStateException();

    }

    @Override @DefinedBy(Api.COMPILER_TREE)

    public Iterable<? extends Element> analyze() {

        throw new IllegalStateException();

    }

    @Override @DefinedBy(Api.COMPILER_TREE)

    public Iterable<? extends JavaFileObject> generate() {

        throw new IllegalStateException();

    }

    @Override @DefinedBy(Api.COMPILER_TREE)

    public void setTaskListener(TaskListener tl) {

        MultiTaskListener mtl = MultiTaskListener.instance(context);

        if (taskListener != null)

            mtl.remove(taskListener);

        if (tl != null)

            mtl.add(tl);

        taskListener = tl;

    }

    @Override @DefinedBy(Api.COMPILER_TREE)

    public void addTaskListener(TaskListener taskListener) {

        MultiTaskListener mtl = MultiTaskListener.instance(context);

        mtl.add(taskListener);

    }

    @Override @DefinedBy(Api.COMPILER_TREE)

    public void removeTaskListener(TaskListener taskListener) {

        MultiTaskListener mtl = MultiTaskListener.instance(context);

        mtl.remove(taskListener);

    }

    public Collection<TaskListener> getTaskListeners() {

        MultiTaskListener mtl = MultiTaskListener.instance(context);

        return mtl.getTaskListeners();

    }

    @Override @DefinedBy(Api.COMPILER_TREE)

    public TypeMirror getTypeMirror(Iterable<? extends Tree> path) {

        // TODO: Should complete attribution if necessary

        Tree last = null;

        for (Tree node : path) {

            last = Objects.requireNonNull(node);

        }

        if (last == null) {

            throw new IllegalArgumentException("empty path");

        }

        return ((JCTree) last).type;

    }

    @Override @DefinedBy(Api.COMPILER_TREE)

    public Elements getElements() {

        if (context == null)

            throw new IllegalStateException();

        return JavacElements.instance(context);

    }

    @Override @DefinedBy(Api.COMPILER_TREE)

    public Types getTypes() {

        if (context == null)

            throw new IllegalStateException();

        return JavacTypes.instance(context);

    }

    @Override @DefinedBy(Api.COMPILER)

    public void addModules(Iterable<String> moduleNames) {

        throw new IllegalStateException();

    }

    @Override @DefinedBy(Api.COMPILER)

    public void setProcessors(Iterable<? extends Processor> processors) {

        throw new IllegalStateException();

    }

    @Override @DefinedBy(Api.COMPILER)

    public void setLocale(Locale locale) {

        throw new IllegalStateException();

    }

    @Override @DefinedBy(Api.COMPILER)

    public Boolean call() {

        throw new IllegalStateException();

    }

    /**

     * For internal use only.

     * This method will be removed without warning.

     * @return the context

     */

    public Context getContext() {

        return context;

    }

    public void initPlugins(Set<List<String>> pluginOpts) {

        PlatformDescription platformProvider = context.get(PlatformDescription.class);

        if (platformProvider != null) {

            for (PluginInfo<Plugin> pluginDesc : platformProvider.getPlugins()) {

                java.util.List<String> options =

                        pluginDesc.getOptions().entrySet().stream()

                                                          .map(e -> e.getKey() + "=" + e.getValue())

                                                          .collect(Collectors.toList());

                try {

                    pluginDesc.getPlugin().init(this, options.toArray(new String[options.size()]));

                } catch (RuntimeException ex) {

                    throw new PropagatedException(ex);

                }

            }

        }

        if (pluginOpts.isEmpty())

            return;

        Set<List<String>> pluginsToCall = new LinkedHashSet<>(pluginOpts);

        JavacProcessingEnvironment pEnv = JavacProcessingEnvironment.instance(context);

        ServiceLoader<Plugin> sl = pEnv.getServiceLoader(Plugin.class);

        for (Plugin plugin : sl) {

            for (List<String> p : pluginsToCall) {

                if (plugin.getName().equals(p.head)) {

                    pluginsToCall.remove(p);

                    try {

                        plugin.init(this, p.tail.toArray(new String[p.tail.size()]));

                    } catch (RuntimeException ex) {

                        throw new PropagatedException(ex);

                    }

                }

            }

        }

        for (List<String> p: pluginsToCall) {

        }

    }

    public void initDocLint(List<String> docLintOpts) {

        if (docLintOpts.isEmpty())

            return;

        new DocLint().init(this, docLintOpts.toArray(new String[docLintOpts.size()]));

        JavaCompiler.instance(context).keepComments = true;

    }

}