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/*
 * 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.hudi.common.table;

import java.util.List;
import java.util.stream.Stream;
import org.apache.hudi.common.model.CompactionOperation;
import org.apache.hudi.common.model.FileSlice;
import org.apache.hudi.common.model.HoodieDataFile;
import org.apache.hudi.common.model.HoodieFileGroup;
import org.apache.hudi.common.table.timeline.HoodieInstant;
import org.apache.hudi.common.util.Option;
import org.apache.hudi.common.util.collection.Pair;

/**
 * Interface for viewing the table file system.
 *
 * @since 0.3.0
 */
public interface TableFileSystemView {

  /**
   * ReadOptimizedView with methods to only access latest version of file for the instant(s) passed.
   */
  interface ReadOptimizedViewWithLatestSlice {

    /**
     * Stream all the latest data files in the given partition
     */
    Stream getLatestDataFiles(String partitionPath);

    /**
     * Get Latest data file for a partition and file-Id
     */
    Option getLatestDataFile(String partitionPath, String fileId);

    /**
     * Stream all the latest data files, in the file system view
     */
    Stream getLatestDataFiles();

    /**
     * Stream all the latest version data files in the given partition with precondition that commitTime(file) before
     * maxCommitTime
     */
    Stream getLatestDataFilesBeforeOrOn(String partitionPath, String maxCommitTime);

    /**
     * Stream all the latest data files pass
     */
    Stream getLatestDataFilesInRange(List commitsToReturn);
  }

  /**
   * ReadOptimizedView - methods to provide a view of columnar data files only.
   */
  interface ReadOptimizedView extends ReadOptimizedViewWithLatestSlice {
    /**
     * Stream all the data file versions grouped by FileId for a given partition
     */
    Stream getAllDataFiles(String partitionPath);

    /**
     * Get the version of data file matching the instant time in the given partition
     */
    Option getDataFileOn(String partitionPath, String instantTime, String fileId);

  }

  /**
   * RealtimeView with methods to only access latest version of file-slice for the instant(s) passed.
   */
  interface RealtimeViewWithLatestSlice {

    /**
     * Stream all the latest file slices in the given partition
     */
    Stream getLatestFileSlices(String partitionPath);

    /**
     * Get Latest File Slice for a given fileId in a given partition
     */
    Option getLatestFileSlice(String partitionPath, String fileId);

    /**
     * Stream all the latest uncompacted file slices in the given partition
     */
    Stream getLatestUnCompactedFileSlices(String partitionPath);

    /**
     * Stream all latest file slices in given partition with precondition that commitTime(file) before maxCommitTime
     *
     * @param partitionPath Partition path
     * @param maxCommitTime Max Instant Time
     * @param includeFileSlicesInPendingCompaction include file-slices that are in pending compaction
     */
    Stream getLatestFileSlicesBeforeOrOn(String partitionPath, String maxCommitTime,
        boolean includeFileSlicesInPendingCompaction);

    /**
     * Stream all "merged" file-slices before on an instant time If a file-group has a pending compaction request, the
     * file-slice before and after compaction request instant is merged and returned.
     * 
     * @param partitionPath Partition Path
     * @param maxInstantTime Max Instant Time
     * @return
     */
    public Stream getLatestMergedFileSlicesBeforeOrOn(String partitionPath, String maxInstantTime);

    /**
     * Stream all the latest file slices, in the given range
     */
    Stream getLatestFileSliceInRange(List commitsToReturn);
  }

  /**
   * RealtimeView - methods to access a combination of columnar data files + log files with real time data.
   */
  interface RealtimeView extends RealtimeViewWithLatestSlice {

    /**
     * Stream all the file slices for a given partition, latest or not.
     */
    Stream getAllFileSlices(String partitionPath);

  }

  /**
   * Stream all the file groups for a given partition
   */
  Stream getAllFileGroups(String partitionPath);

  /**
   * Return Pending Compaction Operations
   *
   * @return Pair>
   */
  Stream> getPendingCompactionOperations();

  /**
   * Last Known Instant on which the view is built
   */
  Option getLastInstant();

  /**
   * Timeline corresponding to the view
   */
  HoodieTimeline getTimeline();
}