<?xml version="1.0" encoding="utf-8"?>
<!--
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.
--> 
<!-- AVRO CODE GERNATION TARGETS FOR MSBUILD -->   
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <UsingTask TaskName="AvscToCSharp" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
      <!-- The directory where the project is located. This is typically $(ProjectDir) -->
      <ProjectDirectory ParameterType="System.String" Required="true" />
      <!-- This is the list of C# target files to be generaterd. This is typically @(Compile) -->
      <SourceFileList ParameterType="System.String" Required="true" />
      <!-- The directory where the .avsc schema files are located. -->
      <AvroSchemaDirectory ParameterType="System.String" Required="true" />
      <!-- The where Avro schema generator and dependent libraries are located. -->
      <AvroBinaryDirectory ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
      <Using Namespace="System" />
      <Using Namespace="System.IO" />
      <Using Namespace="System.Diagnostics" />
      <Code Type="Fragment" Language="cs"><![CDATA[
        // Overall strategy: Copy the executuables and libraries needed
        // to run the MS Avro code generator to a binary directory
        // in the packages directory, and then run code generation for
        // every message defined in the Messages directory.

        // Create a temporary working directory.
        String tempDir = Path.GetFullPath(Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString()));
        Directory.CreateDirectory(tempDir);
        String[] sourceFiles = SourceFileList.Split(new char[]{';'});

        // Get the full path where the avro avsc files are located.
        String messageDirectory = Path.GetFullPath(AvroSchemaDirectory);

        // Add the avro tools directory to the path.
        String path = Environment.GetEnvironmentVariable("path");
        path = Path.GetFullPath(AvroBinaryDirectory) + ";" + path;
        Environment.SetEnvironmentVariable("path", path);

        String copyright = String.Join(Environment.NewLine,
          "// 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.");

        // Setup the conversion process.
        ProcessStartInfo rProcInfo = new ProcessStartInfo()
        {
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            UseShellExecute = false,
            FileName = "Microsoft.Avro.Tools.exe"
        };

        // Log the commands to a file.
        bool conversionError = false;
        using (StreamWriter logWriter = new StreamWriter(Path.Combine(tempDir, "avroout.log")))
        {
          logWriter.WriteLine(Environment.GetEnvironmentVariable("path"));
          foreach (String file in sourceFiles)
          {
            if (file.Contains(@"Message\"))
            {
              // Build the name of the source avsc file from the destiname CS file and avro message path.
              String avroSourceName = Path.Combine(messageDirectory, (Path.GetFileName(file)).Replace(".cs", ".avsc"));
              rProcInfo.Arguments = String.Format(" CodeGen /I:{0} /O:{1}", avroSourceName, tempDir);
              logWriter.Write(rProcInfo.FileName);
              logWriter.WriteLine(rProcInfo.Arguments);

              StringBuilder stdOutBuilder = new StringBuilder();
              StringBuilder stdErrBuilder = new StringBuilder();

              // Start the conversion process
              using (Process rProc = Process.Start(rProcInfo))
              {
                  stdOutBuilder.Append(rProc.StandardOutput.ReadToEnd());
                  stdErrBuilder.Append(rProc.StandardError.ReadToEnd());
                  rProc.WaitForExit();
                  if (rProc.ExitCode != 0)
                  {
                    conversionError = true;
                  }
              }
              logWriter.WriteLine(stdOutBuilder.ToString());
              logWriter.WriteLine(stdErrBuilder.ToString());

              using (StreamReader tmpReader = new StreamReader(Path.Combine(tempDir, Path.GetFileName(file))))
              {
                String source = tmpReader.ReadToEnd();
                using (StreamWriter destWriter = new StreamWriter(Path.GetFullPath(file)))
                {
                  destWriter.WriteLine(copyright);
                  destWriter.Write(source);
                }
              }
            }
          }
        }
        if (!conversionError)
        {
          Directory.Delete(tempDir, recursive : true);
        }
      ]]></Code>
    </Task>
  </UsingTask>
  <Target Name="SetupAvroCodeGen" DependsOnTargets="RestorePackages">
    <Message Text="Copying Avro code generation files to $(AvroBinaryDirectory)..." />
    <Copy SourceFiles="$(AvroTools)" DestinationFolder="$(AvroBinaryDirectory)" />
    <Copy SourceFiles="$(AvroLibrary)" DestinationFolder="$(AvroBinaryDirectory)" />
    <Copy SourceFiles="$(NewtonsoftLibrary)" DestinationFolder="$(AvroBinaryDirectory)" />
  </Target>
  <Target Name="CodeGeneration" DependsOnTargets="SetupAvroCodeGen" BeforeTargets="CoreCompile">
    <Message Text="Generating C# classes from Avro avsc files @(Compile)..." />
    <AvscToCSharp ProjectDirectory="$(ProjectDir)" SourceFileList="@(Compile)" AvroSchemaDirectory="$(AvroSchemaDirectory)" AvroBinaryDirectory="$(AvroBinaryDirectory)" />
  </Target>
</Project>