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// Copyright 2015-2024 Nstream, inc.
//
// 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 swim.system.lane;

import swim.api.Link;
import swim.concurrent.Cont;
import swim.structure.Form;
import swim.system.LaneRelay;
import swim.system.Push;
import swim.system.WarpBinding;
import swim.system.warp.WarpLaneModel;
import swim.warp.CommandMessage;

public class CommandLaneModel extends WarpLaneModel, CommandLaneUplink> {

  public CommandLaneModel() {
    // nop
  }

  @Override
  public String laneType() {
    return "command";
  }

  @Override
  protected CommandLaneUplink createWarpUplink(WarpBinding link) {
    return new CommandLaneUplink(this, link, this.createUplinkAddress(link));
  }

  @Override
  protected void didOpenLaneView(CommandLaneView view) {
    view.setLaneBinding(this);
  }

  @Override
  public void onCommand(Push push) {
    this.awaitStart();
    final CommandMessage message = push.message();
    new CommandLaneRelayCommand(this, null, message, push.cont()).run();
  }

}

final class CommandLaneRelayCommand extends LaneRelay> {

  final Link link;
  final CommandMessage message;
  final Cont cont;
  Form valueForm;
  Object object;

  CommandLaneRelayCommand(CommandLaneModel model, Link link, CommandMessage message, Cont cont) {
    super(model, 3);
    this.link = link;
    this.message = message;
    this.cont = cont;
  }

  @SuppressWarnings("unchecked")
  @Override
  protected boolean runPhase(CommandLaneView view, int phase, boolean preemptive) {
    if (phase == 0) {
      if (preemptive) {
        view.laneWillCommand(this.message);
      }
      return view.dispatchWillCommand(this.message.body(), preemptive);
    } else if (phase == 1) {
      final Form valueForm = view.valueForm;
      if (this.valueForm != valueForm && valueForm != null) {
        this.valueForm = valueForm;
        this.object = valueForm.cast(this.message.body());
        if (this.object == null) {
          this.object = valueForm.unit();
        }
      }
      if (preemptive) {
        ((CommandLaneView