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/*
 * Copyright (C) 2015 Square, 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 com.squareup.wire.schema;

import com.google.common.collect.ImmutableList;
import com.squareup.wire.schema.internal.parser.GroupElement;
import com.squareup.wire.schema.internal.parser.OneOfElement;
import java.util.Collections;
import java.util.List;

public final class OneOf {
  private final String name;
  private final String documentation;
  private final ImmutableList fields;

  private OneOf(String name, String documentation, ImmutableList fields) {
    this.name = name;
    this.documentation = documentation;
    this.fields = fields;
  }

  public String name() {
    return name;
  }

  public String documentation() {
    return documentation;
  }

  public ImmutableList fields() {
    return fields;
  }

  void link(Linker linker) {
    for (Field field : fields) {
      field.link(linker);
    }
  }

  void linkOptions(Linker linker) {
    for (Field field : fields) {
      field.linkOptions(linker);
    }
  }

  OneOf retainAll(Schema schema, MarkSet markSet, ProtoType enclosingType) {
    ImmutableList retainedFields = Field.retainAll(schema, markSet, enclosingType, fields);
    if (retainedFields.isEmpty()) return null;
    return new OneOf(name, documentation, retainedFields);
  }

  static ImmutableList fromElements(String packageName, List elements,
      boolean extension) {
    ImmutableList.Builder oneOfs = ImmutableList.builder();
    for (OneOfElement oneOf : elements) {
      if (!oneOf.getGroups().isEmpty()) {
        GroupElement group = oneOf.getGroups().get(0);
        throw new IllegalStateException(group.getLocation() + ": 'group' is not supported");
      }
      oneOfs.add(new OneOf(oneOf.getName(), oneOf.getDocumentation(),
          Field.fromElements(packageName, oneOf.getFields(), extension)));
    }
    return oneOfs.build();
  }

  static ImmutableList toElements(ImmutableList oneOfs) {
    ImmutableList.Builder elements = new ImmutableList.Builder<>();
    for (OneOf oneOf : oneOfs) {
      elements.add(new OneOfElement(
          oneOf.name,
          oneOf.documentation,
          Field.toElements(oneOf.fields),
          Collections.emptyList() // groups
      ));
    }
    return elements.build();
  }
}