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// Copyright 2015-2019 SWIM.AI 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.runtime.lane;

import swim.api.Link;
import swim.runtime.LinkBinding;
import swim.structure.Form;
import swim.warp.CommandMessage;

public class CommandLaneModel extends LaneModel, CommandLaneUplink> {
  @Override
  protected CommandLaneUplink createUplink(LinkBinding link) {
    return new CommandLaneUplink(this, link);
  }

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

  @Override
  public void onCommand(CommandMessage message) {
    new CommandLaneRelayCommand(this, null, message).run();
  }
}

final class CommandLaneRelayCommand extends LaneRelay> {
  final Link link;
  final CommandMessage message;
  Form valueForm;
  Object object;

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

  @SuppressWarnings("unchecked")
  @Override
  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