/*
 * Copyright (c) 2014, 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.sjavac.comp;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.URI;
import java.util.Arrays;
import java.util.List;
import java.util.Set;

import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;

import com.sun.tools.javac.api.JavacTaskImpl;
import com.sun.tools.javac.api.JavacTool;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.ListBuffer;
import com.sun.tools.javac.util.Options;
import com.sun.tools.sjavac.Log;
import com.sun.tools.sjavac.Util;
import com.sun.tools.sjavac.comp.dependencies.DependencyCollector;
import com.sun.tools.sjavac.comp.dependencies.PublicApiCollector;
import com.sun.tools.sjavac.server.CompilationResult;
import com.sun.tools.sjavac.server.Sjavac;
import com.sun.tools.sjavac.server.SysInfo;

/**
 * The sjavac implementation that interacts with javac and performs the actual
 * compilation.
 *
 *  <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>
 */
public class SjavacImpl implements Sjavac {
static Object lock = new Object();
    @Override
    public SysInfo getSysInfo() {
        return new SysInfo(Runtime.getRuntime().availableProcessors(),
                           Runtime.getRuntime().maxMemory());
    }

    @Override
    public CompilationResult compile(String protocolId,
                                     String invocationId,
                                     String[] args,
                                     List<File> explicitSources,
                                     Set<URI> sourcesToCompile,
                                     Set<URI> visibleSources) {

        JavacTool compiler = (JavacTool) ToolProvider.getSystemJavaCompiler();
        try (StandardJavaFileManager fm = compiler.getStandardFileManager(null, null, null)) {
            SmartFileManager sfm = new SmartFileManager(fm);
            Context context = new Context();

            // Now setup the actual compilation
            CompilationResult compilationResult = new CompilationResult(0);

            // First deal with explicit source files on cmdline and in at file
            ListBuffer<JavaFileObject> explicitJFOs = new ListBuffer<>();
            for (JavaFileObject i : fm.getJavaFileObjectsFromFiles(explicitSources)) {
                explicitJFOs.append(i);
            }
            // Now deal with sources supplied as source_to_compile
            ListBuffer<File> sourcesToCompileFiles = new ListBuffer<>();
            for (URI u : sourcesToCompile)
                sourcesToCompileFiles.append(new File(u));

            for (JavaFileObject i : fm.getJavaFileObjectsFromFiles(sourcesToCompileFiles))
                explicitJFOs.append(i);

            // Create a new logger
            StringWriter stdoutLog = new StringWriter();
            StringWriter stderrLog = new StringWriter();
            PrintWriter stdout = new PrintWriter(stdoutLog);
            PrintWriter stderr = new PrintWriter(stderrLog);
            com.sun.tools.javac.main.Main.Result rc = com.sun.tools.javac.main.Main.Result.OK;
            DependencyCollector depsCollector = new DependencyCollector(context);
            PublicApiCollector pubApiCollector = new PublicApiCollector(context);
            PathAndPackageVerifier papVerifier = new PathAndPackageVerifier();
            try {
                if (explicitJFOs.size() > 0) {
                    sfm.setVisibleSources(visibleSources);
                    sfm.cleanArtifacts();
                    sfm.setLog(stdout);

                    // Do the compilation!
                    JavacTaskImpl task =
                            (JavacTaskImpl) compiler.getTask(stderr,
                                                             sfm,
                                                             null,
                                                             Arrays.asList(args),
                                                             null,
                                                             explicitJFOs,
                                                             context);
                    sfm.setSymbolFileEnabled(!Options.instance(context).isSet("ignore.symbol.file"));
                    task.addTaskListener(depsCollector);
                    task.addTaskListener(pubApiCollector);
                    task.addTaskListener(papVerifier);
                    Log.debug("Invoking javac with args");
                    Arrays.asList(args).forEach(arg -> Log.debug("    " + arg));
                    rc = task.doCall();
                    Log.debug("javac returned with code " + rc);
                    sfm.flush();
                }
            } catch (Exception e) {
                Log.error(Util.getStackTrace(e));
                stderrLog.append(Util.getStackTrace(e));
                rc = com.sun.tools.javac.main.Main.Result.ERROR;
            }

            compilationResult.packageArtifacts = sfm.getPackageArtifacts();

            if (papVerifier.errorsDiscovered())
                rc = com.sun.tools.javac.main.Main.Result.ERROR;

            Dependencies deps = Dependencies.instance(context);
            compilationResult.packageDependencies = deps.getDependencies(explicitJFOs);
            compilationResult.packageCpDependencies = deps.getCpDependencies(explicitJFOs);
            compilationResult.packagePubapis = deps.getPubapis(explicitJFOs, true);
            compilationResult.dependencyPubapis = deps.getPubapis(explicitJFOs, false);
            compilationResult.stdout = stdoutLog.toString();
            compilationResult.stderr = stderrLog.toString();
            compilationResult.returnCode = rc.exitCode;

            return compilationResult;
        } catch (IOException e) {
            throw new Error(e);
        }
    }

    @Override
    public void shutdown() {
        // Nothing to clean up
        // ... maybe we should wait for any current request to finish?
    }


    @Override
    public String serverSettings() {
        return "";
    }

}