/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.tsfile.external.commons.io.filefilter;

import java.io.File;
import java.io.FileFilter;
import java.io.Serializable;
import java.nio.file.FileVisitResult;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Stream;

/**
 * A {@link FileFilter} providing conditional OR logic across a list of file filters. This filter
 * returns {@code true} if any filters in the list return {@code true}. Otherwise, it returns {@code
 * false}. Checking of the file filter list stops when the first filter returns {@code true}.
 *
 * <h2>Deprecating Serialization</h2>
 *
 * <p><em>Serialization is deprecated and will be removed in 3.0.</em>
 *
 * @since 1.0
 * @see FileFilterUtils#or(IOFileFilter...)
 */
public class OrFileFilter extends AbstractFileFilter
    implements ConditionalFileFilter, Serializable {

  private static final long serialVersionUID = 5767770777065432721L;

  /** The list of file filters. */
  private final List<IOFileFilter> fileFilters;

  /**
   * Constructs a new instance of {@link OrFileFilter}.
   *
   * @since 1.1
   */
  public OrFileFilter() {
    this(0);
  }

  /**
   * Constructs a new instance with the given initial list.
   *
   * @param initialList the initial list.
   */
  private OrFileFilter(final ArrayList<IOFileFilter> initialList) {
    this.fileFilters = Objects.requireNonNull(initialList, "initialList");
  }

  /**
   * Constructs a new instance with the given initial capacity.
   *
   * @param initialCapacity the initial capacity.
   */
  private OrFileFilter(final int initialCapacity) {
    this(new ArrayList<>(initialCapacity));
  }

  /**
   * Constructs a new instance for the give filters.
   *
   * @param fileFilters filters to OR.
   * @since 2.9.0
   */
  public OrFileFilter(final IOFileFilter... fileFilters) {
    this(Objects.requireNonNull(fileFilters, "fileFilters").length);
    addFileFilter(fileFilters);
  }

  /**
   * Constructs a new file filter that ORs the result of other filters.
   *
   * @param filter1 the first filter, must not be null
   * @param filter2 the second filter, must not be null
   * @throws IllegalArgumentException if either filter is null
   */
  public OrFileFilter(final IOFileFilter filter1, final IOFileFilter filter2) {
    this(2);
    addFileFilter(filter1);
    addFileFilter(filter2);
  }

  /**
   * Constructs a new instance of {@link OrFileFilter} with the specified filters.
   *
   * @param fileFilters the file filters for this filter, copied.
   * @since 1.1
   */
  public OrFileFilter(final List<IOFileFilter> fileFilters) {
    this(new ArrayList<>(Objects.requireNonNull(fileFilters, "fileFilters")));
  }

  /** {@inheritDoc} */
  @Override
  public boolean accept(final File file) {
    return fileFilters.stream().anyMatch(fileFilter -> fileFilter.accept(file));
  }

  /** {@inheritDoc} */
  @Override
  public boolean accept(final File file, final String name) {
    return fileFilters.stream().anyMatch(fileFilter -> fileFilter.accept(file, name));
  }

  /** {@inheritDoc} */
  @Override
  public FileVisitResult accept(final Path file, final BasicFileAttributes attributes) {
    return toDefaultFileVisitResult(
        fileFilters.stream()
            .anyMatch(
                fileFilter -> fileFilter.accept(file, attributes) == FileVisitResult.CONTINUE));
  }

  /** {@inheritDoc} */
  @Override
  public void addFileFilter(final IOFileFilter fileFilter) {
    this.fileFilters.add(Objects.requireNonNull(fileFilter, "fileFilter"));
  }

  /**
   * Adds the given file filters.
   *
   * @param fileFilters the filters to add.
   * @since 2.9.0
   */
  public void addFileFilter(final IOFileFilter... fileFilters) {
    Stream.of(Objects.requireNonNull(fileFilters, "fileFilters")).forEach(this::addFileFilter);
  }

  /**
   * Provide a String representation of this file filter.
   *
   * @return a String representation
   */
  @Override
  public String toString() {
    final StringBuilder buffer = new StringBuilder();
    buffer.append(super.toString());
    buffer.append("(");
    append(fileFilters, buffer);
    buffer.append(")");
    return buffer.toString();
  }
}
