/*
 * Copyright (c) 2005, 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
 * 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.ParameterNameProvider;
import com.sun.source.util.Plugin;
import com.sun.source.util.TaskListener;
import com.sun.tools.doclint.DocLint;
import com.sun.tools.javac.code.MissingInfoHandler;
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.resources.CompilerProperties.Errors;
import com.sun.tools.javac.resources.CompilerProperties.Warnings;
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.ModuleHelper;
import com.sun.tools.javac.util.Options;
import com.sun.tools.javac.util.PropagatedException;

Provides basic functionality for implementations of JavacTask.
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.
/**
 * 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;
    protected Options options;
    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;
        options = Options.instance(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);
    }

    @Override
    public void setParameterNameProvider(ParameterNameProvider handler) {
        MissingInfoHandler.instance(context).setDelegate(handler);
    }

    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.
Returns:
the context/**
     * 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 {
                    initPlugin(pluginDesc.getPlugin(), options.toArray(new String[options.size()]));
                } catch (RuntimeException ex) {
                    throw new PropagatedException(ex);
                }
            }
        }

        Set<List<String>> pluginsToCall = new LinkedHashSet<>(pluginOpts);
        JavacProcessingEnvironment pEnv = JavacProcessingEnvironment.instance(context);
        ServiceLoader<Plugin> sl = pEnv.getServiceLoader(Plugin.class);
        Set<Plugin> autoStart = new LinkedHashSet<>();
        for (Plugin plugin : sl) {
            if (plugin.autoStart()) {
                autoStart.add(plugin);
            }
            for (List<String> p : pluginsToCall) {
                if (plugin.getName().equals(p.head)) {
                    pluginsToCall.remove(p);
                    autoStart.remove(plugin);
                    try {
                        initPlugin(plugin, p.tail.toArray(new String[p.tail.size()]));
                    } catch (RuntimeException ex) {
                        throw new PropagatedException(ex);
                    }
                    break;
                }
            }
        }
        for (List<String> p : pluginsToCall) {
            Log.instance(context).error(Errors.PluginNotFound(p.head));
        }
        for (Plugin plugin : autoStart) {
            try {
                initPlugin(plugin, new String[0]);
            } catch (RuntimeException ex) {
                throw new PropagatedException(ex);
            }

        }
    }

    private void initPlugin(Plugin p, String... args) {
        Module m = p.getClass().getModule();
        if (m.isNamed() && options.isSet("accessInternalAPI")) {
            ModuleHelper.addExports(getClass().getModule(), m);
        }
        p.init(this, args);
    }

    public void initDocLint(List<String> docLintOpts) {
        if (docLintOpts.isEmpty())
            return;
        try {
            DocLint.newDocLint().init(this, docLintOpts.toArray(new String[docLintOpts.size()]));
            JavaCompiler.instance(context).keepComments = true;
        } catch (IllegalStateException e) {
            Log.instance(context).warning(Warnings.DoclintNotAvailable);
        }
    }
}