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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.json;

import swim.codec.Output;
import swim.codec.Writer;
import swim.structure.Form;
import swim.structure.Item;
import swim.structure.Value;

final class JsonFormWriter extends Writer {
  final JsonWriter json;
  final Form form;
  final T object;
  final Writer part;

  JsonFormWriter(JsonWriter json, Form form, T object, Writer part) {
    this.json = json;
    this.form = form;
    this.object = object;
    this.part = part;
  }

  JsonFormWriter(JsonWriter json, Form form) {
    this(json, form, null, null);
  }

  @Override
  public Writer feed(T object) {
    return new JsonFormWriter(json, form, object, null);
  }

  @Override
  public Writer pull(Output output) {
    return write(output, this.json, this.form, this.object, this.part);
  }

  static  Writer write(Output output, JsonWriter json,
                                Form form, T object, Writer part) {
    if (output == null) {
      return done();
    }
    if (part == null) {
      final Value value = form.mold(object).toValue();
      part = json.writeValue(value, output);
    } else {
      part = part.pull(output);
    }
    if (part.isDone()) {
      return done(object);
    } else if (part.isError()) {
      return part.asError();
    }
    return new JsonFormWriter(json, form, object, part);
  }

  static  Writer write(Output output, JsonWriter json,
                                Form form, T object) {
    return write(output, json, form, object, null);
  }
}