/*
    * Licensed 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 com.jayway.maven.plugins.android;
  
  import com.jayway.maven.plugins.android.phase05compile.NdkBuildMojo;
  import org.apache.commons.lang.SystemUtils;
  import org.apache.maven.plugin.MojoExecutionException;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * Represents an Android NDK.
   *
   * @author Johan Lindquist <johanlindquist@gmail.com>
   */
  public class AndroidNdk
  {
  
      public static final String PROPER_NDK_HOME_DIRECTORY_MESSAGE = "Please provide a proper Android NDK directory path"
              + " as configuration parameter <ndk><path>...</path></ndk> in the plugin <configuration/>. As an "
              + "alternative, you may add the parameter to commandline: -Dandroid.ndk.path=... or set environment "
              + "variable " + NdkBuildMojo.ENV_ANDROID_NDK_HOME + ".";
  
      public static final String[] NDK_ARCHITECTURES = { "armeabi", "armeabi-v7a", "mips", "x86" };
  
      /**
       * Arm toolchain implementations.
       */
      private static final String[] ARM_TOOLCHAIN = {  "arm-linux-androideabi-4.7", "arm-linux-androideabi-4.6",
                                                       "arm-linux-androideabi-4.4.3" };
  
      /**
       * x86 toolchain implementations.
       */
      private static final String[] X86_TOOLCHAIN = { "x86-4.7", "x86-4.6", "x86-4.4.3" };
  
      /**
       * Mips toolchain implementations.
       */
      private static final String[] MIPS_TOOLCHAIN = { "mipsel-linux-android-4.7", "mipsel-linux-android-4.6",
                                                       "mipsel-linux-android-4.4.3" };
  
      /**
       * Possible locations for the gdbserver file.
       */
      private static final String[] GDB_SERVER_LOCATIONS = { "toolchains/%s/prebuilt/gdbserver",
                                                             "prebuilt/%s/gdbserver/gdbserver" };
  
      private final File ndkPath;
  
      public AndroidNdk( File ndkPath )
      {
          assertPathIsDirectory( ndkPath );
          this.ndkPath = ndkPath;
      }
  
      private void assertPathIsDirectory( final File path )
      {
          if ( path == null )
          {
              throw new InvalidNdkException( PROPER_NDK_HOME_DIRECTORY_MESSAGE );
          }
          if ( ! path.isDirectory() )
          {
              throw new InvalidNdkException(
                      "Path \"" + path + "\" is not a directory. " + PROPER_NDK_HOME_DIRECTORY_MESSAGE );
          }
      }
  
      private File findStripper( String toolchain )
      {
          List<String> osDirectories = new ArrayList<String>();
          String extension = "";
  
          if ( SystemUtils.IS_OS_LINUX )
          {
              osDirectories.add( "linux-x86" );
              osDirectories.add( "linux-x86_64" );
          }
          else if ( SystemUtils.IS_OS_WINDOWS )
          {
              osDirectories.add( "windows" );
              osDirectories.add( "windows-x86_64" );
              extension = ".exe";
          }
         else if ( SystemUtils.IS_OS_MAC || SystemUtils.IS_OS_MAC_OSX )
         {
             osDirectories.add( "darwin-x86" );
             osDirectories.add( "darwin-x86_64" );
         }
 
         String fileName = "";
         if ( toolchain.startsWith( "arm" ) )
         {
             fileName = "arm-linux-androideabi-strip" + extension;
         }
         else if ( toolchain.startsWith( "x86" ) )
         {
             fileName = "i686-linux-android-strip" + extension;
         }
         else if ( toolchain.startsWith( "mips" ) )
         {
             fileName = "mipsel-linux-android-strip" + extension;
         }
 
         for ( String osDirectory : osDirectories )
         {
             String stripperLocation =
                 String.format( "toolchains/%s/prebuilt/%s/bin/%s", toolchain, osDirectory, fileName );
             final File stripper = new File( ndkPath, stripperLocation );
             if ( stripper.exists() )
             {
                 return stripper;
             }
         }
         return null;
     }
 
     public File getStripper( String toolchain ) throws MojoExecutionException
     {
         final File stripper = findStripper( toolchain );
         if ( stripper == null )
         {
             throw new MojoExecutionException( "Could not resolve stripper for current OS: " + SystemUtils.OS_NAME );
         }
 
         // Some basic validation
         if ( ! stripper.exists() )
         {
             throw new MojoExecutionException( "Strip binary " + stripper.getAbsolutePath()
                     + " does not exist, please double check the toolchain and OS used" );
         }
 
         // We should be good to go
         return stripper;
     }
 
     private String resolveNdkToolchain( String[] toolchains )
     {
         for ( String toolchain : toolchains )
         {
             File f = findStripper( toolchain );
             if ( f != null && f.exists() )
             {
                 return toolchain;
             }
         }
         return null;
     }
 
     /**
      * Tries to resolve the toolchain based on the path of the file.
      *
      * @param file Native library
      * @return String
      * @throws MojoExecutionException When no toolchain is found
      */
     public String getToolchain( File file ) throws MojoExecutionException
     {
         String resolvedNdkToolchain = null;
 
         // try to resolve the toolchain now
         String ndkArchitecture = file.getParentFile().getName();
         if ( ndkArchitecture.startsWith( "arm" ) )
         {
             resolvedNdkToolchain = resolveNdkToolchain( ARM_TOOLCHAIN );
         }
         else if ( ndkArchitecture.startsWith( "x86" ) )
         {
             resolvedNdkToolchain = resolveNdkToolchain( X86_TOOLCHAIN );
         }
         else if ( ndkArchitecture.startsWith( "mips" ) )
         {
             resolvedNdkToolchain = resolveNdkToolchain( MIPS_TOOLCHAIN );
         }
 
         // if no toolchain can be found
         if ( resolvedNdkToolchain == null )
         {
             throw new MojoExecutionException(
                 "Can not resolve automatically a toolchain to use. Please specify one." );
         }
         return resolvedNdkToolchain;
     }
 
     /**
      * Returns the complete path for the ndk-build tool, based on this NDK.
      *
      * @return the complete path as a <code>String</code>, including the tool's filename.
      */
     public String getNdkBuildPath()
     {
         if ( SystemUtils.IS_OS_WINDOWS )
         {
             return new File( ndkPath, "/ndk-build.cmd" ).getAbsolutePath();
         }
         else
         {
             return new File( ndkPath, "/ndk-build" ).getAbsolutePath();
         }
     }
 
     public File getGdbServer( String ndkArchitecture ) throws MojoExecutionException
     {
         // create a list of possible gdb server parent folder locations
         List<String> gdbServerLocations = new ArrayList<String>();
         if ( ndkArchitecture.startsWith( "arm" ) )
         {
             gdbServerLocations.add( "android-arm" );
             gdbServerLocations.addAll( Arrays.asList( ARM_TOOLCHAIN ) );
         }
         else if ( ndkArchitecture.startsWith( "x86" ) )
         {
             gdbServerLocations.add( "android-x86" );
             gdbServerLocations.addAll( Arrays.asList( X86_TOOLCHAIN ) );
         }
         else if ( ndkArchitecture.startsWith( "mips" ) )
         {
             gdbServerLocations.add( "android-mips" );
             gdbServerLocations.addAll( Arrays.asList( MIPS_TOOLCHAIN ) );
         }
 
         // check for the gdb server
         for ( String location : GDB_SERVER_LOCATIONS )
         {
             for ( String gdbServerLocation : gdbServerLocations )
             {
                 File gdbServerFile = new File( ndkPath, String.format( location, gdbServerLocation ) );
                 if ( gdbServerFile.exists() )
                 {
                     return gdbServerFile;
                 }
             }
         }
 
         //  if we got here, throw an error
         throw new MojoExecutionException( "gdbserver binary for architecture " + ndkArchitecture
             + " does not exist, please double check the toolchain and OS used" );
     }
 }