/*
 *
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

package org.apache.flex.compiler.clients;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

import org.apache.commons.io.FilenameUtils;
import org.apache.flex.compiler.clients.problems.ProblemPrinter;
import org.apache.flex.compiler.clients.problems.ProblemQuery;
import org.apache.flex.compiler.clients.problems.ProblemQueryProvider;
import org.apache.flex.compiler.clients.problems.WorkspaceProblemFormatter;
import org.apache.flex.compiler.codegen.js.IJSPublisher;
import org.apache.flex.compiler.codegen.js.IJSWriter;
import org.apache.flex.compiler.config.Configuration;
import org.apache.flex.compiler.config.ConfigurationBuffer;
import org.apache.flex.compiler.config.Configurator;
import org.apache.flex.compiler.config.ICompilerSettingsConstants;
import org.apache.flex.compiler.driver.IBackend;
import org.apache.flex.compiler.driver.js.IJSApplication;
import org.apache.flex.compiler.exceptions.ConfigurationException;
import org.apache.flex.compiler.exceptions.ConfigurationException.IOError;
import org.apache.flex.compiler.exceptions.ConfigurationException.MustSpecifyTarget;
import org.apache.flex.compiler.exceptions.ConfigurationException.OnlyOneSource;
import org.apache.flex.compiler.internal.config.FlashBuilderConfigurator;
import org.apache.flex.compiler.internal.driver.as.ASBackend;
import org.apache.flex.compiler.internal.driver.js.amd.AMDBackend;
import org.apache.flex.compiler.internal.driver.js.goog.GoogBackend;
import org.apache.flex.compiler.internal.driver.js.goog.JSGoogConfiguration;
import org.apache.flex.compiler.internal.driver.js.jsc.JSCBackend;
import org.apache.flex.compiler.internal.driver.js.node.NodeBackend;
import org.apache.flex.compiler.internal.driver.mxml.flexjs.MXMLFlexJSBackend;
import org.apache.flex.compiler.internal.parsing.as.FlexJSASDocDelegate;
import org.apache.flex.compiler.internal.projects.CompilerProject;
import org.apache.flex.compiler.internal.projects.FlexJSProject;
import org.apache.flex.compiler.internal.projects.ISourceFileHandler;
import org.apache.flex.compiler.internal.targets.FlexJSTarget;
import org.apache.flex.compiler.internal.targets.JSTarget;
import org.apache.flex.compiler.internal.units.ResourceModuleCompilationUnit;
import org.apache.flex.compiler.internal.units.SourceCompilationUnitFactory;
import org.apache.flex.compiler.internal.workspaces.Workspace;
import org.apache.flex.compiler.problems.ConfigurationProblem;
import org.apache.flex.compiler.problems.ICompilerProblem;
import org.apache.flex.compiler.problems.InternalCompilerProblem;
import org.apache.flex.compiler.problems.UnableToBuildSWFProblem;
import org.apache.flex.compiler.problems.UnexpectedExceptionProblem;
import org.apache.flex.compiler.projects.ICompilerProject;
import org.apache.flex.compiler.targets.ITarget;
import org.apache.flex.compiler.targets.ITarget.TargetType;
import org.apache.flex.compiler.targets.ITargetSettings;
import org.apache.flex.compiler.units.ICompilationUnit;
import org.apache.flex.compiler.units.ICompilationUnit.UnitType;
import org.apache.flex.tools.FlexTool;
import org.apache.flex.utils.ArgumentUtil;
import org.apache.flex.utils.FilenameNormalization;

import com.google.common.base.Preconditions;
import com.google.common.collect.Iterables;

/**
 * @author Erik de Bruin
 * @author Michael Schmalle
 */
public class MXMLJSCNode implements JSCompilerEntryPoint, ProblemQueryProvider,
        FlexTool
{
    @Override
    public ProblemQuery getProblemQuery()
    {
        return problems;
    }

    /*
     * Exit code enumerations.
     */
    static enum ExitCode
    {
        SUCCESS(0),
        PRINT_HELP(1),
        FAILED_WITH_PROBLEMS(2),
        FAILED_WITH_ERRORS(3),
        FAILED_WITH_EXCEPTIONS(4),
        FAILED_WITH_CONFIG_PROBLEMS(5);

        ExitCode(int code)
        {
            this.code = code;
        }

        final int code;
    }

    @Override
    public String getName()
    {
        return FLEX_TOOL_MXMLC;
    }

    @Override
    public int execute(String[] args)
    {
        final List<ICompilerProblem> problems = new ArrayList<ICompilerProblem>();
        return mainNoExit(args, problems, true);
    }

    /**
     * Java program entry point.
     * 
     * @param args command line arguments
     */
    public static void main(final String[] args)
    {
        int exitCode = staticMainNoExit(args);
        System.exit(exitCode);
    }

    /**
     * Entry point for the {@code <compc>} Ant task.
     *
     * @param args Command line arguments.
     * @return An exit code.
     */
    public static int staticMainNoExit(final String[] args)
    {
        long startTime = System.nanoTime();

        final MXMLJSCNode mxmlc = new MXMLJSCNode();
        final List<ICompilerProblem> problems = new ArrayList<ICompilerProblem>();
        final int exitCode = mxmlc.mainNoExit(args, problems, true);

        long endTime = System.nanoTime();
        System.out.println((endTime - startTime) / 1e9 + " seconds");

        return exitCode;
    }

    protected Workspace workspace;
    protected FlexJSProject project;

    protected ProblemQuery problems;
    protected ISourceFileHandler asFileHandler;
    protected Configuration config;
    protected Configurator projectConfigurator;
    private ConfigurationBuffer configBuffer;
    private ICompilationUnit mainCU;
    protected ITarget target;
    protected ITargetSettings targetSettings;
    protected IJSApplication jsTarget;
    private IJSPublisher jsPublisher;
    
    public MXMLJSCNode()
    {
        IBackend backend = new NodeBackend();
        workspace = new Workspace();
        workspace.setASDocDelegate(new FlexJSASDocDelegate());
        project = new FlexJSProject(workspace, backend);
        problems = new ProblemQuery(); // this gets replaced in configure().  Do we need it here?
        asFileHandler = backend.getSourceFileHandlerInstance();
    }

    @Override
    public int mainNoExit(final String[] args, List<ICompilerProblem> problems,
            Boolean printProblems)
    {
        int exitCode = -1;
        try
        {
            exitCode = _mainNoExit(ArgumentUtil.fixArgs(args), problems);
        }
        catch (Exception e)
        {
            System.err.println(e.toString());
        }
        finally
        {
            if (problems != null && !problems.isEmpty())
            {
                if (printProblems)
                {
                    final WorkspaceProblemFormatter formatter = new WorkspaceProblemFormatter(
                            workspace);
                    final ProblemPrinter printer = new ProblemPrinter(formatter);
                    printer.printProblems(problems);
                }
            }
        }
        return exitCode;
    }

    /**
     * Entry point that doesn't call <code>System.exit()</code>. This is for
     * unit testing.
     * 
     * @param args command line arguments
     * @return exit code
     */
    private int _mainNoExit(final String[] args,
            List<ICompilerProblem> outProblems)
    {
        ExitCode exitCode = ExitCode.SUCCESS;
        try
        {
            final boolean continueCompilation = configure(args);

/*            if (outProblems != null && !config.isVerbose())
                JSSharedData.STDOUT = JSSharedData.STDERR = null;*/

            if (continueCompilation)
            {
                project.setProblems(problems.getProblems());
               	compile();
                if (problems.hasFilteredProblems())
                {
                    if (problems.hasErrors())
                        exitCode = ExitCode.FAILED_WITH_ERRORS;
                    else
                        exitCode = ExitCode.FAILED_WITH_PROBLEMS;
                }
            }
            else if (problems.hasFilteredProblems())
            {
                exitCode = ExitCode.FAILED_WITH_CONFIG_PROBLEMS;
            }
            else
            {
                exitCode = ExitCode.PRINT_HELP;
            }
        }
        catch (Exception e)
        {
            if (outProblems == null) {
                System.err.println(e.getMessage());
            } else
            {
                final ICompilerProblem unexpectedExceptionProblem = new UnexpectedExceptionProblem(
                        e);
                problems.add(unexpectedExceptionProblem);
            }
            exitCode = ExitCode.FAILED_WITH_EXCEPTIONS;
        }
        finally
        {
            waitAndClose();

            if (outProblems != null && problems.hasFilteredProblems())
            {
                for (ICompilerProblem problem : problems.getFilteredProblems())
                {
                    outProblems.add(problem);
                }
            }
        }
        return exitCode.code;
    }

    /**
     * Main body of this program. This method is called from the public static
     * method's for this program.
     * 
     * @return true if compiler succeeds
     * @throws IOException
     * @throws InterruptedException
     */
    protected boolean compile()
    {
        JSGoogConfiguration googConfiguration = (JSGoogConfiguration) config;
        boolean compilationSuccess = false;

        try
        {
            project.getSourceCompilationUnitFactory().addHandler(asFileHandler);

            if (!googConfiguration.getSkipTranspile())
            {
	            if (!setupTargetFile()) {
                    return false;
                }

	            buildArtifact();
            }
            if (jsTarget != null || googConfiguration.getSkipTranspile())
            {
                List<ICompilerProblem> errors = new ArrayList<ICompilerProblem>();
                List<ICompilerProblem> warnings = new ArrayList<ICompilerProblem>();

                if (!config.getCreateTargetWithErrors())
                {
                    problems.getErrorsAndWarnings(errors, warnings);
                    if (errors.size() > 0)
                        return false;
                }

                jsPublisher = (IJSPublisher) project.getBackend().createPublisher(
                        project, errors, config);

                File outputFolder = jsPublisher.getOutputFolder();

                if (!googConfiguration.getSkipTranspile())
                {
	                ArrayList<ICompilationUnit> roots = new ArrayList<ICompilationUnit>();
	                roots.add(mainCU);
	                Set<ICompilationUnit> incs = target.getIncludesCompilationUnits();
	                roots.addAll(incs);
	                project.mixinClassNames = new TreeSet<String>();
	                List<ICompilationUnit> reachableCompilationUnits = project.getReachableCompilationUnitsInSWFOrder(roots);
	                ((FlexJSTarget)target).collectMixinMetaData(project.mixinClassNames, reachableCompilationUnits);
	                for (final ICompilationUnit cu : reachableCompilationUnits)
	                {
	                    ICompilationUnit.UnitType cuType = cu.getCompilationUnitType();
	
	                    if (cuType == ICompilationUnit.UnitType.AS_UNIT
	                            || cuType == ICompilationUnit.UnitType.MXML_UNIT)
	                    {
	                        final File outputClassFile = getOutputClassFile(
	                                cu.getQualifiedNames().get(0), outputFolder);
	
	                        System.out.println("Compiling file: " + outputClassFile);
	
	                        ICompilationUnit unit = cu;
	
	                        IJSWriter writer;
	                        if (cuType == ICompilationUnit.UnitType.AS_UNIT)
	                        {
	                            writer = (IJSWriter) project.getBackend().createWriter(project,
	                                    errors, unit, false);
	                        }
	                        else
	                        {
	                            writer = (IJSWriter) project.getBackend().createMXMLWriter(
	                                    project, errors, unit, false);
	                        }
	
	                        BufferedOutputStream out = new BufferedOutputStream(
	                                new FileOutputStream(outputClassFile));
	
	                        File outputSourceMapFile = null;
	                        if (project.config.getSourceMap())
	                        {
	                            outputSourceMapFile = getOutputSourceMapFile(
	                                    cu.getQualifiedNames().get(0), outputFolder);
	                        }
	                        
	                        writer.writeTo(out, outputSourceMapFile);
	                        out.flush();
	                        out.close();
	                        writer.close();
	                    }
	                }
                }
                
                if (jsPublisher != null)
                {
                    compilationSuccess = jsPublisher.publish(problems);
                }
                else
                {
                    compilationSuccess = true;
                }
            }
        }
        catch (Exception e)
        {
            final ICompilerProblem problem = new InternalCompilerProblem(e);
            problems.add(problem);
        }

        return compilationSuccess;
    }

    /**
     * Build target artifact.
     * 
     * @throws InterruptedException threading error
     * @throws IOException IO error
     * @throws ConfigurationException
     */
    protected void buildArtifact() throws InterruptedException, IOException,
            ConfigurationException
    {
        jsTarget = buildJSTarget();
    }

    private IJSApplication buildJSTarget() throws InterruptedException,
            FileNotFoundException, ConfigurationException
    {
        final List<ICompilerProblem> problemsBuildingSWF = new ArrayList<ICompilerProblem>();

        project.mainCU = mainCU;
        final IJSApplication app = buildApplication(project,
                config.getMainDefinition(), mainCU, problemsBuildingSWF);
        problems.addAll(problemsBuildingSWF);
        if (app == null)
        {
            ICompilerProblem problem = new UnableToBuildSWFProblem(
                    getOutputFilePath());
            problems.add(problem);
        }

        return app;
    }

    /**
     * Replaces FlexApplicationProject::buildSWF()
     * 
     * @param applicationProject
     * @param rootClassName
     * @param problems
     * @return
     * @throws InterruptedException
     */

    private IJSApplication buildApplication(CompilerProject applicationProject,
            String rootClassName, ICompilationUnit mainCU,
            Collection<ICompilerProblem> problems) throws InterruptedException,
            ConfigurationException, FileNotFoundException
    {
        Collection<ICompilerProblem> fatalProblems = applicationProject.getFatalProblems();
        if (!fatalProblems.isEmpty())
        {
            problems.addAll(fatalProblems);
            return null;
        }

        return ((JSTarget) target).build(mainCU, problems);
    }

    /**
     * Get the output file path. If {@code -output} is specified, use its value;
     * otherwise, use the same base name as the target file.
     * 
     * @return output file path
     */
    private String getOutputFilePath()
    {
        if (config.getOutput() == null)
        {
            final String extension = "." + project.getBackend().getOutputExtension();
            return FilenameUtils.removeExtension(config.getTargetFile()).concat(
                    extension);
        }
        else
            return config.getOutput();
    }

    /**
     * @author Erik de Bruin
     * 
     *         Get the output class file. This includes the (sub)directory in
     *         which the original class file lives. If the directory structure
     *         doesn't exist, it is created.
     * 
     * @param qname
     * @param outputFolder
     * @return output class file path
     */
    private File getOutputClassFile(String qname, File outputFolder)
    {
        String[] cname = qname.split("\\.");
        String sdirPath = outputFolder + File.separator;
        if (cname.length > 0)
        {
            for (int i = 0, n = cname.length - 1; i < n; i++)
            {
                sdirPath += cname[i] + File.separator;
            }

            File sdir = new File(sdirPath);
            if (!sdir.exists())
                sdir.mkdirs();

            qname = cname[cname.length - 1];
        }

        return new File(sdirPath + qname + "." + project.getBackend().getOutputExtension());
    }

    /**
     * @param qname
     * @param outputFolder
     * @return output source map file path
     */
    private File getOutputSourceMapFile(String qname, File outputFolder)
    {
        String[] cname = qname.split("\\.");
        String sdirPath = outputFolder + File.separator;
        if (cname.length > 0)
        {
            for (int i = 0, n = cname.length - 1; i < n; i++)
            {
                sdirPath += cname[i] + File.separator;
            }

            File sdir = new File(sdirPath);
            if (!sdir.exists())
                sdir.mkdirs();

            qname = cname[cname.length - 1];
        }

        return new File(sdirPath + qname + "." + project.getBackend().getOutputExtension() + ".map");
    }

    /**
     * Mxmlc uses target file as the main compilation unit and derive the output
     * SWF file name from this file.
     * 
     * @return true if successful, false otherwise.
     * @throws OnlyOneSource
     * @throws InterruptedException
     */
    protected boolean setupTargetFile() throws InterruptedException
    {
        final String mainFileName = config.getTargetFile();

        final String normalizedMainFileName = FilenameNormalization.normalize(mainFileName);

        final SourceCompilationUnitFactory compilationUnitFactory = project.getSourceCompilationUnitFactory();

        File normalizedMainFile = new File(normalizedMainFileName);
        if (compilationUnitFactory.canCreateCompilationUnit(normalizedMainFile))
        {
            project.addIncludeSourceFile(normalizedMainFile);

            final List<String> sourcePath = config.getCompilerSourcePath();
            String mainQName = null;
            if (sourcePath != null && !sourcePath.isEmpty())
            {
                for (String path : sourcePath)
                {
                    final String otherPath = new File(path).getAbsolutePath();
                    if (mainFileName.startsWith(otherPath))
                    {
                        mainQName = mainFileName.substring(otherPath.length() + 1);
                        mainQName = mainQName.replaceAll("\\\\", "/");
                        mainQName = mainQName.replaceAll("\\/", ".");
                        if (mainQName.endsWith(".as"))
                            mainQName = mainQName.substring(0,
                                    mainQName.length() - 3);
                        break;
                    }
                }
            }

            if (mainQName == null)
                mainQName = FilenameUtils.getBaseName(mainFileName);

            Collection<ICompilationUnit> mainFileCompilationUnits = workspace.getCompilationUnits(
                    normalizedMainFileName, project);

            mainCU = Iterables.getOnlyElement(mainFileCompilationUnits);

            config.setMainDefinition(mainQName);
        }

        Preconditions.checkNotNull(mainCU,
                "Main compilation unit can't be null");

        ITargetSettings settings = getTargetSettings();
        if (settings != null)
            project.setTargetSettings(settings);

        target = project.getBackend().createTarget(project,
                getTargetSettings(), null);

        return true;
    }

    private ITargetSettings getTargetSettings()
    {
        if (targetSettings == null)
            targetSettings = projectConfigurator.getTargetSettings(null);

        return targetSettings;
    }

    /**
     * Create a new Configurator. This method may be overridden to allow
     * Configurator subclasses to be created that have custom configurations.
     * 
     * @return a new instance or subclass of {@link Configurator}.
     */
    protected Configurator createConfigurator()
    {
        return project.getBackend().createConfigurator();
    }

    /**
     * Load configurations from all the sources.
     * 
     * @param args command line arguments
     * @return True if mxmlc should continue with compilation.
     */
    protected boolean configure(final String[] args)
    {
        project.getSourceCompilationUnitFactory().addHandler(asFileHandler);
        project.configurator = projectConfigurator = createConfigurator();

        try
        {
            if (useFlashBuilderProjectFiles(args))
            {
                projectConfigurator.setConfiguration(
                        FlashBuilderConfigurator.computeFlashBuilderArgs(args,
                                getTargetType().getExtension()),
                        ICompilerSettingsConstants.FILE_SPECS_VAR);
            }
            else
            {
                projectConfigurator.setConfiguration(args,
                        ICompilerSettingsConstants.FILE_SPECS_VAR);
            }

            projectConfigurator.applyToProject(project);
            project.config = (JSGoogConfiguration) projectConfigurator.getConfiguration();

            config = projectConfigurator.getConfiguration();
            configBuffer = projectConfigurator.getConfigurationBuffer();

            problems = new ProblemQuery(projectConfigurator.getCompilerProblemSettings());
            problems.addAll(projectConfigurator.getConfigurationProblems());

            if (configBuffer.getVar("version") != null) //$NON-NLS-1$
                return false;

            if (problems.hasErrors())
                return false;

            validateTargetFile();
            return true;
        }
        catch (ConfigurationException e)
        {
            final ICompilerProblem problem = new ConfigurationProblem(e);
            problems.add(problem);
            return false;
        }
        catch (Exception e)
        {
            final ICompilerProblem problem = new ConfigurationProblem(null, -1,
                    -1, -1, -1, e.getMessage());
            problems.add(problem);
            return false;
        }
        finally
        {
            if (config == null)
            {
                config = new Configuration();
                configBuffer = new ConfigurationBuffer(Configuration.class,
                        Configuration.getAliases());
            }
        }
    }

    private boolean useFlashBuilderProjectFiles(String[] args)
    {
        for (String arg : args)
        {
            if (arg.equals("-fb")
                    || arg.equals("-use-flashbuilder-project-files"))
                return true;
        }
        return false;
    }

    protected TargetType getTargetType()
    {
        return TargetType.SWF;
    }

    /**
     * Validate target file.
     * 
     * @throws MustSpecifyTarget
     * @throws IOError
     */
    protected void validateTargetFile() throws ConfigurationException
    {
        if (mainCU instanceof ResourceModuleCompilationUnit)
            return; //when compiling a Resource Module, no target file is defined.

        final String targetFile = config.getTargetFile();
        if (targetFile == null)
            throw new ConfigurationException.MustSpecifyTarget(null, null, -1);

        final File file = new File(targetFile);
        if (!file.exists())
            throw new ConfigurationException.IOError(targetFile);
    }

    /**
     * Wait till the workspace to finish compilation and close.
     */
    protected void waitAndClose()
    {
        workspace.startIdleState();
        try
        {
            workspace.close();
        }
        finally
        {
            workspace.endIdleState(Collections.<ICompilerProject, Set<ICompilationUnit>> emptyMap());
        }
    }

    /**
     * Force terminate the compilation process.
     */
    protected void close()
    {
        workspace.close();
    }
    
    public List<String> getSourceList()
    {
        ArrayList<String> list = new ArrayList<String>();
        LinkedList<ICompilerProblem> problemList = new LinkedList<ICompilerProblem>();
        try
        {
            ArrayList<ICompilationUnit> roots = new ArrayList<ICompilationUnit>();
            roots.add(mainCU);
            Set<ICompilationUnit> incs = target.getIncludesCompilationUnits();
            roots.addAll(incs);
            project.mixinClassNames = new TreeSet<String>();
            List<ICompilationUnit> units = project.getReachableCompilationUnitsInSWFOrder(roots);
            for (ICompilationUnit unit : units)
            {
                UnitType ut = unit.getCompilationUnitType();
                if (ut == UnitType.AS_UNIT || ut == UnitType.MXML_UNIT)
                {
                    list.add(unit.getAbsoluteFilename());
                }
            }
        }
        catch (InterruptedException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        return list;
    }
    
    public String getMainSource()
    {
        return mainCU.getAbsoluteFilename();
    }

}