#  Copyright (c) 2017 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.

"""Plots statistics from WebRTC integration test logs.

Usage: $ python plot_webrtc_test_logs.py filename.txt
"""

import numpy
import sys
import re

import matplotlib.pyplot as plt

# Log events.
EVENT_START = 'RUN      ] CodecSettings/PlotVideoProcessorIntegrationTest.'
EVENT_END = 'OK ] CodecSettings/PlotVideoProcessorIntegrationTest.'

# Metrics to plot, tuple: (name to parse in file, label to use when plotting).
BITRATE = ('Target Bitrate', 'bitrate (kbps)')
WIDTH = ('Width', 'width')
HEIGHT = ('Height', 'height')
FILENAME = ('Filename', 'clip')
CODEC_TYPE = ('Codec type', 'Codec')
ENCODER_IMPLEMENTATION_NAME = ('Encoder implementation name', 'enc name')
DECODER_IMPLEMENTATION_NAME = ('Decoder implementation name', 'dec name')
NUM_FRAMES = ('Total # of frames', 'num frames')
CORES = ('#CPU cores used', 'CPU cores used')
DENOISING = ('Denoising', 'denoising')
RESILIENCE = ('Resilience', 'resilience')
ERROR_CONCEALMENT = ('Error concealment', 'error concealment')
QP = ('Average QP', 'avg QP')
PSNR = ('PSNR avg', 'PSNR (dB)')
SSIM = ('SSIM avg', 'SSIM')
ENC_BITRATE = ('Encoding bitrate', 'encoded bitrate (kbps)')
FRAMERATE = ('Frame rate', 'fps')
NUM_DROPPED_FRAMES = ('Number of dropped frames', 'num dropped frames')
NUM_FRAMES_TO_TARGET = ('Number of frames to approach target rate',
                        'frames to reach target rate')
ENCODE_TIME = ('Encoding time', 'encode time (us)')
ENCODE_TIME_AVG = ('Encoding time', 'encode time (us) avg')
DECODE_TIME = ('Decoding time', 'decode time (us)')
DECODE_TIME_AVG = ('Decoding time', 'decode time (us) avg')
FRAME_SIZE = ('Frame sizes', 'frame size (bytes)')
FRAME_SIZE_AVG = ('Frame sizes', 'frame size (bytes) avg')
AVG_KEY_FRAME_SIZE = ('Average key frame size', 'avg key frame size (bytes)')
AVG_NON_KEY_FRAME_SIZE = ('Average non-key frame size',
                          'avg non-key frame size (bytes)')

# Settings.
SETTINGS = [
  WIDTH,
  HEIGHT,
  FILENAME,
  NUM_FRAMES,
  ENCODE_TIME,
  DECODE_TIME,
  FRAME_SIZE,
]

# Settings, options for x-axis.
X_SETTINGS = [
  CORES,
  FRAMERATE,
  DENOISING,
  RESILIENCE,
  ERROR_CONCEALMENT,
  BITRATE,  # TODO(asapersson): Needs to be last.
]

# Settings, options for subplots.
SUBPLOT_SETTINGS = [
  CODEC_TYPE,
  ENCODER_IMPLEMENTATION_NAME,
  DECODER_IMPLEMENTATION_NAME,
] + X_SETTINGS

# Results.
RESULTS = [
  PSNR,
  SSIM,
  ENC_BITRATE,
  NUM_DROPPED_FRAMES,
  NUM_FRAMES_TO_TARGET,
  ENCODE_TIME_AVG,
  DECODE_TIME_AVG,
  QP,
  AVG_KEY_FRAME_SIZE,
  AVG_NON_KEY_FRAME_SIZE,
]

METRICS_TO_PARSE = SETTINGS + SUBPLOT_SETTINGS + RESULTS

Y_METRICS = [res[1] for res in RESULTS]

# Parameters for plotting.
FIG_SIZE_SCALE_FACTOR_X = 2
FIG_SIZE_SCALE_FACTOR_Y = 2.8
GRID_COLOR = [0.45, 0.45, 0.45]


def ParseSetting(filename, setting):
  """Parses setting from file.

  Args:
    filename: The name of the file.
    setting: Name of setting to parse (e.g. width).

  Returns:
    A list holding parsed settings, e.g. ['width: 128.0', 'width: 160.0'] """

  settings = []

  f = open(filename)
  while True:
    line = f.readline()
    if not line:
      break
    if re.search(r'%s' % EVENT_START, line):
      # Parse event.
      parsed = {}
      while True:
        line = f.readline()
        if not line:
          break
        if re.search(r'%s' % EVENT_END, line):
          # Add parsed setting to list.
          if setting in parsed:
            s = setting + ': ' + str(parsed[setting])
            if s not in settings:
              settings.append(s)
          break

        TryFindMetric(parsed, line, f)

  f.close()
  return settings


def ParseMetrics(filename, setting1, setting2):
  """Parses metrics from file.

  Args:
    filename: The name of the file.
    setting1: First setting for sorting metrics (e.g. width).
    setting2: Second setting for sorting metrics (e.g. CPU cores used).

  Returns:
    A dictionary holding parsed metrics.

  For example:
    metrics[key1][key2][measurement]

  metrics = {
  "width: 352": {
    "CPU cores used: 1.0": {
      "encode time (us)": [0.718005, 0.806925, 0.909726, 0.931835, 0.953642],
      "PSNR (dB)": [25.546029, 29.465518, 34.723535, 36.428493, 38.686551],
      "bitrate (kbps)": [50, 100, 300, 500, 1000]
    },
    "CPU cores used: 2.0": {
      "encode time (us)": [0.718005, 0.806925, 0.909726, 0.931835, 0.953642],
      "PSNR (dB)": [25.546029, 29.465518, 34.723535, 36.428493, 38.686551],
      "bitrate (kbps)": [50, 100, 300, 500, 1000]
    },
  },
  "width: 176": {
    "CPU cores used: 1.0": {
      "encode time (us)": [0.857897, 0.91608, 0.959173, 0.971116, 0.980961],
      "PSNR (dB)": [30.243646, 33.375592, 37.574387, 39.42184, 41.437897],
      "bitrate (kbps)": [50, 100, 300, 500, 1000]
    },
  }
  } """

  metrics = {}

  # Parse events.
  f = open(filename)
  while True:
    line = f.readline()
    if not line:
      break
    if re.search(r'%s' % EVENT_START, line):
      # Parse event.
      parsed = {}
      while True:
        line = f.readline()
        if not line:
          break
        if re.search(r'%s' % EVENT_END, line):
          # Add parsed values to metrics.
          key1 = setting1 + ': ' + str(parsed[setting1])
          key2 = setting2 + ': ' + str(parsed[setting2])
          if key1 not in metrics:
            metrics[key1] = {}
          if key2 not in metrics[key1]:
            metrics[key1][key2] = {}

          for label in parsed:
            if label not in metrics[key1][key2]:
              metrics[key1][key2][label] = []
            metrics[key1][key2][label].append(parsed[label])

          break

        TryFindMetric(parsed, line, f)

  f.close()
  return metrics


def TryFindMetric(parsed, line, f):
  for metric in METRICS_TO_PARSE:
    name = metric[0]
    label = metric[1]
    if re.search(r'%s' % name, line):
      found, value = GetMetric(name, line)
      if not found:
        # TODO(asapersson): Change format.
        # Try find min, max, average stats.
        found, minimum = GetMetric("Min", f.readline())
        if not found:
          return
        found, maximum = GetMetric("Max", f.readline())
        if not found:
          return
        found, average = GetMetric("Average", f.readline())
        if not found:
          return

        parsed[label + ' min'] = minimum
        parsed[label + ' max'] = maximum
        parsed[label + ' avg'] = average

      parsed[label] = value
      return


def GetMetric(name, string):
  # Float (e.g. bitrate = 98.8253).
  pattern = r'%s\s*[:=]\s*([+-]?\d+\.*\d*)' % name
  m = re.search(r'%s' % pattern, string)
  if m is not None:
    return StringToFloat(m.group(1))

  # Alphanumeric characters (e.g. codec type : VP8).
  pattern = r'%s\s*[:=]\s*(\w+)' % name
  m = re.search(r'%s' % pattern, string)
  if m is not None:
    return True, m.group(1)

  return False, -1


def StringToFloat(value):
  try:
    value = float(value)
  except ValueError:
    print "Not a float, skipped %s" % value
    return False, -1

  return True, value


def Plot(y_metric, x_metric, metrics):
  """Plots y_metric vs x_metric per key in metrics.

  For example:
    y_metric = 'PSNR (dB)'
    x_metric = 'bitrate (kbps)'
    metrics = {
      "CPU cores used: 1.0": {
        "PSNR (dB)": [25.546029, 29.465518, 34.723535, 36.428493, 38.686551],
        "bitrate (kbps)": [50, 100, 300, 500, 1000]
      },
      "CPU cores used: 2.0": {
        "PSNR (dB)": [25.546029, 29.465518, 34.723535, 36.428493, 38.686551],
        "bitrate (kbps)": [50, 100, 300, 500, 1000]
      },
    }
    """
  for key in metrics:
    data = metrics[key]
    if y_metric not in data:
      print "Failed to find metric: %s" % y_metric
      continue

    y = numpy.array(data[y_metric])
    x = numpy.array(data[x_metric])
    if len(y) != len(x):
      print "Length mismatch for %s, %s" % (y, x)
      continue

    label = y_metric + ' - ' + str(key)

    plt.plot(x, y, label=label, linewidth=1.5, marker='o', markersize=5,
             markeredgewidth=0.0)


def PlotFigure(settings, y_metrics, x_metric, metrics, title):
  """Plots metrics in y_metrics list. One figure is plotted and each entry
  in the list is plotted in a subplot (and sorted per settings).

  For example:
    settings = ['width: 128.0', 'width: 160.0']. Sort subplot per setting.
    y_metrics = ['PSNR (dB)', 'PSNR (dB)']. Metric to plot per subplot.
    x_metric = 'bitrate (kbps)'

  """

  plt.figure()
  plt.suptitle(title, fontsize='small', fontweight='bold')
  rows = len(settings)
  cols = 1
  pos = 1
  while pos <= rows:
    plt.rc('grid', color=GRID_COLOR)
    ax = plt.subplot(rows, cols, pos)
    plt.grid()
    plt.setp(ax.get_xticklabels(), visible=(pos == rows), fontsize='small')
    plt.setp(ax.get_yticklabels(), fontsize='small')
    setting = settings[pos - 1]
    Plot(y_metrics[pos - 1], x_metric, metrics[setting])
    plt.title(setting, fontsize='x-small')
    plt.legend(fontsize='xx-small')
    pos += 1

  plt.xlabel(x_metric, fontsize='small')
  plt.subplots_adjust(left=0.04, right=0.98, bottom=0.04, top=0.96, hspace=0.1)


def GetTitle(filename):
  title = ''
  codec_types = ParseSetting(filename, CODEC_TYPE[1])
  for i in range(0, len(codec_types)):
    title += codec_types[i] + ', '

  cores = ParseSetting(filename, CORES[1])
  for i in range(0, len(cores)):
    title += cores[i].split('.')[0] + ', '

  framerate = ParseSetting(filename, FRAMERATE[1])
  for i in range(0, len(framerate)):
    title += framerate[i].split('.')[0] + ', '

  enc_names = ParseSetting(filename, ENCODER_IMPLEMENTATION_NAME[1])
  for i in range(0, len(enc_names)):
    title += enc_names[i] + ', '

  dec_names = ParseSetting(filename, DECODER_IMPLEMENTATION_NAME[1])
  for i in range(0, len(dec_names)):
    title += dec_names[i] + ', '

  filenames = ParseSetting(filename, FILENAME[1])
  title += filenames[0].split('_')[0]

  num_frames = ParseSetting(filename, NUM_FRAMES[1])
  for i in range(0, len(num_frames)):
    title += ' (' + num_frames[i].split('.')[0] + ')'

  return title


def ToString(input_list):
  return ToStringWithoutMetric(input_list, ('', ''))


def ToStringWithoutMetric(input_list, metric):
  i = 1
  output_str = ""
  for m in input_list:
    if m != metric:
      output_str = output_str + ("%s. %s\n" % (i, m[1]))
      i += 1
  return output_str


def GetIdx(text_list):
  return int(raw_input(text_list)) - 1


def main():
  filename = sys.argv[1]

  # Setup.
  idx_metric = GetIdx("Choose metric:\n0. All\n%s" % ToString(RESULTS))
  if idx_metric == -1:
    # Plot all metrics. One subplot for each metric.
    # Per subplot: metric vs bitrate (per resolution).
    cores = ParseSetting(filename, CORES[1])
    setting1 = CORES[1]
    setting2 = WIDTH[1]
    sub_keys = [cores[0]] * len(Y_METRICS)
    y_metrics = Y_METRICS
    x_metric = BITRATE[1]
  else:
    resolutions = ParseSetting(filename, WIDTH[1])
    idx = GetIdx("Select metric for x-axis:\n%s" % ToString(X_SETTINGS))
    if X_SETTINGS[idx] == BITRATE:
      idx = GetIdx("Plot per:\n%s" % ToStringWithoutMetric(SUBPLOT_SETTINGS,
                                                           BITRATE))
      idx_setting = METRICS_TO_PARSE.index(SUBPLOT_SETTINGS[idx])
      # Plot one metric. One subplot for each resolution.
      # Per subplot: metric vs bitrate (per setting).
      setting1 = WIDTH[1]
      setting2 = METRICS_TO_PARSE[idx_setting][1]
      sub_keys = resolutions
      y_metrics = [RESULTS[idx_metric][1]] * len(sub_keys)
      x_metric = BITRATE[1]
    else:
      # Plot one metric. One subplot for each resolution.
      # Per subplot: metric vs setting (per bitrate).
      setting1 = WIDTH[1]
      setting2 = BITRATE[1]
      sub_keys = resolutions
      y_metrics = [RESULTS[idx_metric][1]] * len(sub_keys)
      x_metric = X_SETTINGS[idx][1]

  metrics = ParseMetrics(filename, setting1, setting2)

  # Stretch fig size.
  figsize = plt.rcParams["figure.figsize"]
  figsize[0] *= FIG_SIZE_SCALE_FACTOR_X
  figsize[1] *= FIG_SIZE_SCALE_FACTOR_Y
  plt.rcParams["figure.figsize"] = figsize

  PlotFigure(sub_keys, y_metrics, x_metric, metrics, GetTitle(filename))

  plt.show()


if __name__ == '__main__':
  main()