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/*
 * Copyright 2014 Guidewire Software, Inc.
 */

package gw.lang.gosuc;

import gw.config.CommonServices;
import gw.fs.IDirectory;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

import manifold.util.JreUtil;
import manifold.util.ManExceptionUtil;

/**
 */
public class GosucUtil {
  public static String indent( String in ) {
    StringBuilder sb = new StringBuilder( in );
    sb.insert( 0, "  " );
    for( int i = 0; i < sb.length(); i++ ) {
      char c = sb.charAt( i );
      if( c == '\n' ) {
        sb.insert( i + 1, "  " );
      }
    }
    return sb.toString();
  }

  public static IDirectory getDirectoryForPath( String uriPath ) {
    return CommonServices.getFileSystem().getIDirectory( Paths.get( URI.create( uriPath ) ) );
  }

  public static List makeStringPaths( List sourcePaths ) {
    List paths = new ArrayList<>();
    for( IDirectory dir: sourcePaths ) {
      paths.add( dir.getPath().getPathString() );
    }
    return paths;
  }

  public static URL toURL( File file ) {
    try {
      return file.toURI().toURL();
    }
    catch( MalformedURLException e ) {
      System.err.println( "Could not get URL for " + file );
      return null;
    }
  }

  public static List toDirectories(List uriPaths) {
    List dirs = new ArrayList<>();
    for (String uri : uriPaths) {
      dirs.add( CommonServices.getFileSystem().getIDirectory( Paths.get( URI.create( uri ) ) ) );
    }
    return dirs;
  }

  /**
   * Get all JARs from the lib directory of the System's java.home property
   * @return List of absolute paths to all JRE libraries
   */
  public static List getJreJars() {
    String javaHome = System.getProperty("java.home");
    Path libsDir = FileSystems.getDefault().getPath( javaHome, "/lib");
    List retval = GosucUtil.getIbmClasspath();
    try {
      retval.addAll( Files.walk( libsDir)
                       .filter( path -> path.toFile().isFile())
                       .filter( path -> path.toString().endsWith(".jar"))
                       .map( Path::toString )
                       .collect( Collectors.toList()));
    } catch (SecurityException | IOException e) {
      e.printStackTrace();
      throw new RuntimeException(e);
    }
    return retval;
  }

  /**
   * Special handling for the unusual structure of the IBM JDK.
   * @return A list containing the special 'vm.jar' absolute path if we are using an IBM JDK; otherwise an empty list is returned.
   */
  protected static List getIbmClasspath() {
    List retval = new ArrayList<>();
    if(System.getProperty("java.vendor").equals("IBM Corporation")) {
      String fileSeparator = System.getProperty("file.separator");
      String classpathSeparator = System.getProperty("path.separator");
      String[] bootClasspath = System.getProperty("sun.boot.class.path").split(classpathSeparator);
      for(String entry : bootClasspath) {
        if(entry.endsWith(fileSeparator + "vm.jar")) {
          retval.add(entry);
          break;
        }
      }
    }
    return retval;
  }

  public static List getGosuBootstrapJars() {
    if( JreUtil.isJava8() )
    {
      return getGosuBootstrapJars_Java8();
    }
    return getGosuBootstrapJars_Java9();
  }
  public static List getGosuBootstrapJars_Java8() {
    return Arrays.asList(getClassLocation("gw.internal.gosu.parser.MetaType"), //get gosu-core
        getClassLocation("gw.lang.Gosu"), //get gosu-core-api
        getClassLocation("manifold.api.host.IManifoldHost"), //get manifold core
        getClassLocation("manifold.rt.api.Bindings"), //get manifold-rt
//        getClassLocation("manifold.ext.ExtensionMethod"), //get manifold-ext
        getClassLocation("manifold.util.ReflectUtil"), //get manifold-util
        //getClassLocation("com.github.benmanes.caffeine.cache.Caffeine"), //get caffeine
        getClassLocation("gw.internal.ext.org.objectweb.asm.ClassWriter"), //get asm
        getClassLocation("com.sun.source.tree.Tree"), //get tools.jar
        getClassLocation("gw.internal.ext.com.beust.jcommander.JCommander") //get jcommander
    );
  }
  public static List getGosuBootstrapJars_Java9() {
    return Arrays.asList(getClassLocation("gw.internal.gosu.parser.MetaType"), //get gosu-core
        getClassLocation("gw.lang.Gosu"), //get gosu-core-api
        getClassLocation("manifold.api.host.IManifoldHost"), //get manifold core
        getClassLocation("manifold.rt.api.Bindings"), //get manifold-rt
//        getClassLocation("manifold.ext.ExtensionMethod"), //get manifold-ext
        getClassLocation("manifold.util.ReflectUtil"), //get manifold-util
        //getClassLocation("com.github.benmanes.caffeine.cache.Caffeine"), //get caffeine
        getClassLocation("gw.internal.ext.org.objectweb.asm.ClassWriter"), //get asm
        getClassLocation("gw.internal.ext.com.beust.jcommander.JCommander") //get jcommander
    );
  }

  public static String getClassLocation( String className )
  {
    Class clazz;
    try
    {
      clazz = Class.forName( className );
    }
    catch( ClassNotFoundException cnfe )
    {
      throw new RuntimeException( "Unable to locate Gosu libraries in classpath.\n", cnfe );
    }

    ProtectionDomain pDomain = clazz.getProtectionDomain();
    CodeSource cSource = pDomain.getCodeSource();

    if( cSource != null )
    {
      URL loc = cSource.getLocation();
      URI file;
      try
      {
        file = loc.toURI();
      }
      catch( Exception e )
      {
        throw ManExceptionUtil.unchecked( e );
      }
      return file.toString();
    }
    else
    {
      throw new RuntimeException( "Cannot find the location of the requested className <" + className + "> in classpath." );
    }
  }

}