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import org.crsh.cli.Man
import org.crsh.cli.Usage
import org.crsh.cli.Command
import org.crsh.cli.Argument
import org.crsh.cli.Required
import org.crsh.jcr.command.Path
import org.crsh.command.Pipe
import javax.jcr.Node

@Usage("mixin commands")
@Man("""The mixin command manipulates JCR node mixins. Mixins can be added to or removed from nodes.""")
public class mixin extends org.crsh.jcr.command.JCRCommand {

  // It consumes a node stream or path arguments
  @Usage("add a mixin to one or several nodes")
  @Man("""\
The add command addds a mixin to one or several nodes, this command is a 
command, and can add a mixin from an incoming node stream, for instance:

[/]% select * from mynode | mixin add mix:versionable
""")
  @Command
  public Pipe add(
     @Usage("the mixin name to add") @Argument @Required String mixin,
     @Argument @Usage("the paths of the node receiving the mixin") List paths) {
    assertConnected();
    context.writer << "Mixin $mixin added to nodes";
    return new Pipe() {
      @Override
      void open() {
        perform(paths, this.&provide);
      }
      @Override
      void provide(Node node) {
        node.addMixin(mixin);
        context.provide(node);
        context.writer << " $node.path";
      }
    }
  }

  // It consumes a node stream or path arguments
  @Usage("removes a mixin from one or several nodes")
  @Man("""\
The remove command removes a mixin from one or several nodes, this command is a 
command, and can remove a mixin from an incoming node stream, for instance:

[/]% select * from mynode | mixin remove mix:versionable
""")
  @Command
  public Pipe remove(
      @Usage("the mixin name to remove") @Argument @Required String mixin,
      @Argument @Usage("the paths of the node receiving the mixin") List paths) {
    assertConnected();
    context.writer << "Mixin $mixin removed from nodes";
    return new Pipe() {
      @Override
      void open() {
        perform(paths, this.&provide);
      }
      @Override
      void provide(Node node) {
        node.removeMixin(mixin);
        context.provide(node);
        context.writer << " $node.path";
      }
    }
  }

  private void perform(List paths, def closure) {
    paths.each { path ->
      def node = getNodeByPath(path);
      closure(node);
    };
  }
}