<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
    <PropertyGroup>
        <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">$(MSBuildProjectDirectory)\..\</SolutionDir>

        <!-- Windows specific commands -->
        <NuGetToolsPath Condition=" '$(OS)' == 'Windows_NT'">$([System.IO.Path]::Combine($(SolutionDir), ".nuget"))</NuGetToolsPath>
        <PackagesConfig Condition=" '$(OS)' == 'Windows_NT'">$([System.IO.Path]::Combine($(ProjectDir), "packages.config"))</PackagesConfig>
        <PackagesDir Condition=" '$(OS)' == 'Windows_NT'">$([System.IO.Path]::Combine($(SolutionDir), "packages"))</PackagesDir>

        <!-- We need to launch nuget.exe with the mono command if we're not on windows -->
        <NuGetToolsPath Condition=" '$(OS)' != 'Windows_NT'">$(SolutionDir).nuget</NuGetToolsPath>
        <PackagesConfig Condition=" '$(OS)' != 'Windows_NT' ">packages.config</PackagesConfig>
        <PackagesDir Condition=" '$(OS)' != 'Windows_NT'">$(SolutionDir)packages</PackagesDir>
        
        <!-- NuGet command -->
        <NuGetExePath>$(NuGetToolsPath)\nuget.exe</NuGetExePath>
        <NuGetCommand Condition=" '$(OS)' == 'Windows_NT'">"$(NuGetExePath)"</NuGetCommand>
        <NuGetCommand Condition=" '$(OS)' != 'Windows_NT' ">mono --runtime=v4.0.30319 $(NuGetExePath)</NuGetCommand>

        <PackageOutputDir Condition="$(PackageOutputDir) == ''">$(TargetDir.Trim('\\'))</PackageOutputDir>

        <!-- Package sources used to restore packages. By default will used the registered sources under %APPDATA%\NuGet\NuGet.Config -->
        <PackageSources>""</PackageSources>

        <!-- Enable the restore command to run before builds -->
        <RestorePackages Condition="$(RestorePackages) == ''">false</RestorePackages>

        <!-- Property that enables building a package from a project -->
        <BuildPackage Condition="$(BuildPackage) == ''">false</BuildPackage>

        <!-- Commands -->
        <RestoreCommand>$(NuGetCommand) install "$(PackagesConfig)" -source $(PackageSources) -o "$(PackagesDir)"</RestoreCommand>
        <BuildCommand>$(NuGetCommand) pack "$(ProjectPath)" -p Configuration=$(Configuration) -o "$(PackageOutputDir)" -symbols</BuildCommand>

        <!-- Make the build depend on restore packages -->
        <BuildDependsOn Condition="$(RestorePackages) == 'true'">
            RestorePackages;
            $(BuildDependsOn);
        </BuildDependsOn>

        <!-- Make the build depend on restore packages -->
        <BuildDependsOn Condition="$(BuildPackage) == 'true'">
            $(BuildDependsOn);
            BuildPackage;
        </BuildDependsOn>
    </PropertyGroup>

    <Target Name="CheckPrerequisites">
        <!-- Raise an error if we're unable to locate nuget.exe  -->
        <Error Condition="!Exists('$(NuGetExePath)')" Text="Unable to locate '$(NuGetExePath)'" />
    </Target>

    <Target Name="RestorePackages" DependsOnTargets="CheckPrerequisites">
        <Exec Command="$(RestoreCommand)"
              Condition="'$(OS)' != 'Windows_NT' And Exists('$(PackagesConfig)')" />
              
        <Exec Command="$(RestoreCommand)"
              LogStandardErrorAsError="true"
              Condition="'$(OS)' == 'Windows_NT' And Exists('$(PackagesConfig)')" />
    </Target>

    <Target Name="BuildPackage" DependsOnTargets="CheckPrerequisites" Condition=" '$(OS)' != 'Windows_NT' ">
        <Exec Command="$(BuildCommand)" 
              Condition=" '$(OS)' != 'Windows_NT' " />
              
        <Exec Command="$(BuildCommand)"
              LogStandardErrorAsError="true"
              Condition=" '$(OS)' == 'Windows_NT' " />
    </Target>
</Project>