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/*The MIT License (MIT)

Copyright (c) 2016 Muhammad Hammad

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Sogiftware.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.*/


package org.dvare.dynamic.compiler;

import org.dvare.dynamic.exceptions.DynamicCompilerException;
import org.dvare.dynamic.loader.ClassPathBuilder;
import org.dvare.dynamic.resources.DynamicClassLoader;
import org.dvare.dynamic.resources.DynamicJavaFileManager;
import org.dvare.dynamic.resources.StringSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.tools.*;
import java.io.File;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.*;

public class DynamicCompiler {
    private static Logger logger = LoggerFactory.getLogger(DynamicCompiler.class);
    private final JavaCompiler javaCompiler;
    private final StandardJavaFileManager standardFileManager;
    private List options = new ArrayList<>();
    private DynamicClassLoader dynamicClassLoader;

    private Collection compilationUnits = new ArrayList<>();
    private List> errors = new ArrayList<>();
    private List> warnings = new ArrayList<>();
    private ClassLoader classLoader;
    private String classpath = "";

    private boolean updateClassLoader = false;
    private boolean extractJar = false;


    public DynamicCompiler() {
        this(Thread.currentThread().getContextClassLoader());
    }

    public DynamicCompiler(ClassLoader classLoader) {
        this(classLoader, ToolProvider.getSystemJavaCompiler());
    }

    public DynamicCompiler(ClassLoader classLoader, JavaCompiler javaCompiler) {
        this(classLoader, javaCompiler, false, false, false);
    }

    public DynamicCompiler(ClassLoader classLoader, JavaCompiler javaCompiler,
                           boolean writeClassFile, boolean separateClassLoader, boolean extractJar) {

        this.classLoader = classLoader;
        this.javaCompiler = javaCompiler;
        standardFileManager = javaCompiler.getStandardFileManager(null, null, null);

        this.extractJar = extractJar;

        options.add("-Xlint:unchecked");
        if (classLoader instanceof URLClassLoader) {
            classpath = new ClassPathBuilder(extractJar).getClassPath(URLClassLoader.class.cast(classLoader));
        }

        dynamicClassLoader = new DynamicClassLoader(classLoader, writeClassFile, separateClassLoader);

    }


    public void addSource(String className, String source) {
        addSource(new StringSource(className, source));
    }


    public void addSource(File sourceFile) {
        Iterable compilationUnitsIterable =
                standardFileManager.getJavaFileObjectsFromFiles(Collections.singletonList(sourceFile));
        for (JavaFileObject javaFileObject : compilationUnitsIterable) {
            addSource(javaFileObject);

        }
    }

    public void addSource(JavaFileObject javaFileObject) {
        compilationUnits.add(javaFileObject);
    }

    public void addJar(URL url) throws Exception {

        File file = new File(url.getFile());
        if (file.exists()) {
            classpath = classpath + file.getAbsolutePath() + File.pathSeparator;
            logger.debug(file.getAbsolutePath() + File.pathSeparator);

            if (classLoader instanceof URLClassLoader) {
                Method method = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
                method.setAccessible(true);
                method.invoke(classLoader, url);
            }
        }

    }


    public Map> build() throws DynamicCompilerException {

        errors.clear();
        warnings.clear();

        if (!classpath.trim().isEmpty()) {
            options.add("-classpath");
            options.add(classpath);
        }


        JavaFileManager fileManager = new DynamicJavaFileManager(standardFileManager, dynamicClassLoader);


        DiagnosticCollector collector = new DiagnosticCollector<>();
        JavaCompiler.CompilationTask task = javaCompiler.getTask(null, fileManager, collector, options, null, compilationUnits);

        if (updateClassLoader) {
            Thread.currentThread().setContextClassLoader(dynamicClassLoader);
        }

        try {

            if (!compilationUnits.isEmpty()) {
                boolean result = task.call();

                if (!result || collector.getDiagnostics().size() > 0) {

                    for (Diagnostic diagnostic : collector.getDiagnostics()) {
                        switch (diagnostic.getKind()) {
                            case NOTE:
                            case MANDATORY_WARNING:
                            case WARNING:
                                warnings.add(diagnostic);
                                break;
                            case OTHER:
                            case ERROR:
                            default:
                                errors.add(diagnostic);
                                break;
                        }

                    }


                    if (!errors.isEmpty()) {
                        throw new DynamicCompilerException("Compilation Error", errors);
                    }
                }
            }

            return dynamicClassLoader.getClasses();
        } catch (ClassFormatError | ClassNotFoundException e) {
            throw new DynamicCompilerException(e);
        } finally {
            compilationUnits.clear();

        }


    }


    private List diagnosticToString(List> diagnostics) {

        List diagnosticMessages = new ArrayList<>();

        for (Diagnostic diagnostic : diagnostics) {
            diagnosticMessages.add("line: " + diagnostic.getLineNumber() + ", message: " + diagnostic.getMessage(Locale.US));
        }

        return diagnosticMessages;

    }


    public List getErrors() {
        return diagnosticToString(errors);
    }

    public List getWarnings() {
        return diagnosticToString(warnings);
    }

    public ClassLoader getClassLoader() {
        return dynamicClassLoader;
    }

    public void setUpdateClassLoader(boolean updateClassLoader) {
        this.updateClassLoader = updateClassLoader;
    }

    public String getClasspath() {
        return classpath;
    }

    public void setClasspath(String classpath) {
        this.classpath = classpath;
    }


}