/*
 * Copyright 2013-present Facebook, 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.facebook.buck.apple.xcode.xcodeproj;

import com.facebook.buck.apple.xcode.XcodeprojSerializer;
import com.google.common.base.MoreObjects;
import com.google.common.io.Files;
import java.util.Optional;
import javax.annotation.Nullable;

/** Reference to a concrete file. */
public class PBXFileReference extends PBXReference {
  private Optional<String> explicitFileType;
  private Optional<String> lastKnownFileType;

  public PBXFileReference(
      String name, @Nullable String path, SourceTree sourceTree, Optional<String> defaultType) {
    super(name, path, sourceTree);

    // PBXVariantGroups create file references where the name doesn't contain the file
    // extension.
    //
    // Try the path if it's present to check for an extension, then fall back to the name
    // if the path isn't present.
    String pathOrName = MoreObjects.firstNonNull(path, name);

    // this is necessary to prevent O(n^2) behavior in xcode project loading
    String fileType =
        FileTypes.FILE_EXTENSION_TO_IDENTIFIER.get(Files.getFileExtension(pathOrName));
    if (fileType != null && (FileTypes.EXPLICIT_FILE_TYPE_BROKEN_IDENTIFIERS.contains(fileType))
        || FileTypes.MODIFIABLE_FILE_TYPE_IDENTIFIERS.contains(fileType)) {
      explicitFileType = Optional.empty();
      lastKnownFileType = Optional.of(fileType);
    } else if (fileType != null) {
      explicitFileType = Optional.of(fileType);
      lastKnownFileType = Optional.empty();
    } else {
      explicitFileType = defaultType;
      lastKnownFileType = Optional.empty();
    }
  }

  public Optional<String> getExplicitFileType() {
    return explicitFileType;
  }

  public Optional<String> getLastKnownFileType() {
    return lastKnownFileType;
  }

  public void setExplicitFileType(Optional<String> explicitFileType) {
    this.explicitFileType = explicitFileType;
  }

  @Override
  public String isa() {
    return "PBXFileReference";
  }

  @Override
  public void serializeInto(XcodeprojSerializer s) {
    super.serializeInto(s);

    if (explicitFileType.isPresent()) {
      s.addField("explicitFileType", explicitFileType.get());
    }

    if (lastKnownFileType.isPresent()) {
      s.addField("lastKnownFileType", lastKnownFileType.get());
    }
  }

  @Override
  public String toString() {
    return String.format("%s explicitFileType=%s", super.toString(), getExplicitFileType());
  }
}