/*
 *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>

#include "absl/flags/flag.h"
#include "absl/flags/parse.h"
#include "rtc_tools/frame_editing/frame_editing_lib.h"

ABSL_FLAG(std::string, in_path, "", "Path and filename to the input file");
ABSL_FLAG(int32_t,
          width,
          -1,
          "Width in pixels of the frames in the input file");
ABSL_FLAG(int32_t,
          height,
          -1,
          "Height in pixels of the frames in the input file");
ABSL_FLAG(int32_t, f, -1, "First frame to process");
ABSL_FLAG(int32_t,
          interval,
          -1,
          "Interval specifies with what ratio the number of frames should be "
          "increased or decreased with");
ABSL_FLAG(int32_t, l, -1, "Last frame to process");
ABSL_FLAG(std::string,
          out_path,
          "output.yuv",
          "The output file to which frames are written");

// A command-line tool to edit a YUV-video (I420 sub-sampled).
int main(int argc, char* argv[]) {
  absl::ParseCommandLine(argc, argv);
  // TODO(bugs.webrtc.org/10616): Add program usage message when Abseil
  // flags supports it.
  // std::string usage =
  //    "Deletes a series of frames in a yuv file."
  //    " Only I420 is supported!\n"
  //    "Example usage:\n" +
  //    program_name +
  //    " --in_path=input.yuv --width=320 --height=240 --f=60 --interval=1 "
  //    "--l=120"
  //    " --out_path=edited_clip.yuv\n"
  //    "Command line flags:\n"
  //    "--in_path(string): Path and filename to the input file\n"
  //    "--width(int): Width in pixels of the frames in the input file."
  //    " Default: -1\n"
  //    "--height(int): Height in pixels of the frames in the input file."
  //    " Default: -1\n"
  //    "--f(int): First frame to process. Default: -1\n"
  //    "--l(int): Last frame to process.  Default: -1\n"
  //    "Frame numbering starts at 1. The set of frames to be processed includes
  //    " "the frame with the number <f> and <l>.\n"
  //    "--interval(int): Interval specifies with what ratio the number of "
  //    "frames "
  //    "should be increased or decreased with.\n"
  //    "If you set <interval> to a positive number, frames between <f> and <l>
  //    " "will be inserted <interval> times."
  //   " If you set <interval> to a negative number then the amount of frames "
  //    "between <f> and <l> will be decreased with a ratio of abs(interval)."
  //    " Set interval=-1 if every frame between <f> and <l> should be "
  //    "deleted. Set interval=-2 if every second frame should be deleted, and "
  //    "so "
  //    "on. Frame numbering between <f> and <l> starts with 1 and frames with"
  //    " number n where (n - 1)  % interval == 0 will be kept.\n"
  //    "Example 1:\n"
  //    "If one clip has 10 frames (1 to 10) and you specify <f>=4, <l>=7 and "
  //    "interval=2, then you will get a clip that contains frame "
  //    "1, 2, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 9 and 10.\n"
  //    "Example 2:\n"
  //    "If you specify f=4, l=7 and interval=-1, then you will get a clip that"
  //    " contains frame 1, 2, 3, 8, 9 and 10.\n"
  //    "Example 3:\n"
  //    "If one clip has 10 frames (1 to 10), and you specify f=1, l=10 and "
  //    " interval=-4, then you will get a clip that contains frame "
  //    "1, 5 and 9.\n"
  //    "No interpolation is done when up-sampling."
  //    " Default: -1\n"
  //    "--out_path(string): The output file to which frames are written."
  //    " Default: output.yuv\n";

  const std::string in_path = absl::GetFlag(FLAGS_in_path);
  int width = absl::GetFlag(FLAGS_width);
  int height = absl::GetFlag(FLAGS_height);
  int first_frame_to_cut = absl::GetFlag(FLAGS_f);
  int interval = absl::GetFlag(FLAGS_interval);
  int last_frame_to_cut = absl::GetFlag(FLAGS_l);

  const std::string out_path = absl::GetFlag(FLAGS_out_path);

  if (in_path.empty()) {
    fprintf(stderr, "You must specify a file to edit\n");
    return -1;
  }

  if (first_frame_to_cut <= 0 || last_frame_to_cut <= 0) {
    fprintf(stderr, "Error: You must specify which frames to cut!\n");
    return -2;
  }

  if (width <= 0 || height <= 0) {
    fprintf(stderr, "Error: width or height cannot be <= 0!\n");
    return -3;
  }
  return webrtc::EditFrames(in_path, width, height, first_frame_to_cut,
                            interval, last_frame_to_cut, out_path);
}