package funkin.util.macro;

#if !display
class GitCommit
{
  /**
   * Get the SHA1 hash of the current Git commit.
   */
  public static macro function getGitCommitHash():haxe.macro.Expr.ExprOf<String>
  {
    #if !display
    // Get the current line number.
    var pos = haxe.macro.Context.currentPos();

    var process = new sys.io.Process('git', ['rev-parse', 'HEAD']);
    if (process.exitCode() != 0)
    {
      var message = process.stderr.readAll().toString();
      haxe.macro.Context.info('[WARN] Could not determine current git commit; is this a proper Git repository?', pos);
    }

    // read the output of the process
    var commitHash:String = process.stdout.readLine();
    var commitHashSplice:String = commitHash.substr(0, 7);

    trace('Git Commit ID: ${commitHashSplice}');

    // Generates a string expression
    return macro $v{commitHashSplice};
    #else
    // `#if display` is used for code completion. In this case returning an
    // empty string is good enough; We don't want to call git on every hint.
    var commitHash:String = "";
    return macro $v{commitHashSplice};
    #end
  }

  /**
   * Get the branch name of the current Git commit.
   */
  public static macro function getGitBranch():haxe.macro.Expr.ExprOf<String>
  {
    #if !display
    // Get the current line number.
    var pos = haxe.macro.Context.currentPos();
    var branchProcess = new sys.io.Process('git', ['rev-parse', '--abbrev-ref', 'HEAD']);

    if (branchProcess.exitCode() != 0)
    {
      var message = branchProcess.stderr.readAll().toString();
      haxe.macro.Context.info('[WARN] Could not determine current git commit; is this a proper Git repository?', pos);
    }

    var branchName:String = branchProcess.stdout.readLine();
    trace('Git Branch Name: ${branchName}');

    // Generates a string expression
    return macro $v{branchName};
    #else
    // `#if display` is used for code completion. In this case returning an
    // empty string is good enough; We don't want to call git on every hint.
    var branchName:String = "";
    return macro $v{branchName};
    #end
  }

  /**
   * Get whether the local Git repository is dirty or not.
   */
  public static macro function getGitHasLocalChanges():haxe.macro.Expr.ExprOf<Bool>
  {
    #if !display
    // Get the current line number.
    var pos = haxe.macro.Context.currentPos();
    var branchProcess = new sys.io.Process('git', ['status', '--porcelain']);

    if (branchProcess.exitCode() != 0)
    {
      var message = branchProcess.stderr.readAll().toString();
      haxe.macro.Context.info('[WARN] Could not determine current git commit; is this a proper Git repository?', pos);
    }

    var output:String = branchProcess.stdout.readLine();
    trace('Git Status Output: ${output}');

    // Generates a string expression
    return macro $v{output.length > 0};
    #else
    // `#if display` is used for code completion. In this case we just assume true.
    return macro $v{true};
    #end
  }
}
#end