content: __all__ = ['BaseProgressBar', 'TextProgressBar',
             'EnhancedTextProgressBar', 'TqdmProgressBar',
             'HTMLProgressBar', 'progress_bars']
  
  import time
  import datetime
  import sys
  from qutip import settings
  
  
  class BaseProgressBar(object):
      """
      An abstract progress bar with some shared functionality.
  
      Example usage:
  
          n_vec = linspace(0, 10, 100)
          pbar = TextProgressBar(len(n_vec))
          for n in n_vec:
              pbar.update()
              compute_with_n(n)
          pbar.finished()
  
      """
  
      def __init__(self, iterations=0, chunk_size=10, **kwargs):
          self._start(iterations, chunk_size)
  
      def _start(self, iterations, chunk_size=10, **kwargs):
          self.N = float(iterations)
          self.n = 0
          self.p_chunk_size = chunk_size
          self.p_chunk = chunk_size
          self.t_start = time.time()
          self.t_done = self.t_start - 1
  
      def update(self):
          pass
  
      def total_time(self):
          return self.t_done - self.t_start
  
      def time_elapsed(self):
          return "%6.2fs" % (time.time() - self.t_start)
  
      def time_remaining_est(self, p):
          if 100 >= p > 0.0:
              t_r_est = (time.time() - self.t_start) * (100.0 - p) / p
          else:
              t_r_est = 0
  
          dd = datetime.datetime(1, 1, 1) + datetime.timedelta(seconds=t_r_est)
          time_string = "%02d:%02d:%02d:%02d" % \
              (dd.day - 1, dd.hour, dd.minute, dd.second)
  
          return time_string
  
      def finished(self):
          self.t_done = time.time()
  
  
  class TextProgressBar(BaseProgressBar):
      """
      A simple text-based progress bar.
      """
  
      def __init__(self, iterations=0, chunk_size=10, **kwargs):
          super()._start(iterations, chunk_size)
  
      def update(self):
          self.n += 1
          n = self.n
          p = (n / self.N) * 100.0
          if p >= self.p_chunk:
              print("%4.1f%%." % p +
                    " Run time: %s." % self.time_elapsed() +
                    " Est. time left: %s" % self.time_remaining_est(p))
              sys.stdout.flush()
              self.p_chunk += self.p_chunk_size
  
      def finished(self):
          self.t_done = time.time()
          print("Total run time: %s" % self.time_elapsed())
  
  
  class EnhancedTextProgressBar(BaseProgressBar):
      """
      An enhanced text-based progress bar.
      """
  
      def __init__(self, iterations=0, chunk_size=10, **kwargs):
          super()._start(iterations, chunk_size)
          self.fill_char = '*'
          self.width = 25
  
      def update(self):
          self.n += 1
          n = self.n
          percent_done = int(round(n / self.N * 100.0))
          all_full = self.width - 2
          num_hashes = int(round((percent_done / 100.0) * all_full))
          prog_bar = ('[' + self.fill_char * num_hashes +
                      ' ' * (all_full - num_hashes) + ']')
          pct_place = (len(prog_bar) // 2) - len(str(percent_done))
          pct_string = '%d%%' % percent_done
          prog_bar = (prog_bar[0:pct_place] +
                      (pct_string + prog_bar[pct_place + len(pct_string):]))
          prog_bar += ' Elapsed %s / Remaining %s' % (
              self.time_elapsed().strip(),
              self.time_remaining_est(percent_done))
          print('\r', prog_bar, end='')
          sys.stdout.flush()
  
      def finished(self):
          self.t_done = time.time()
          print("\r", "Total run time: %s" % self.time_elapsed())
  
  
  class TqdmProgressBar(BaseProgressBar):
      """
      A progress bar using tqdm module
      """
  
      def __init__(self, iterations=0, chunk_size=10, **kwargs):
          from tqdm.auto import tqdm
          self.pbar = tqdm(total=iterations, **kwargs)
          self.t_start = time.time()
          self.t_done = self.t_start - 1
  
      def update(self):
          self.pbar.update()
  
      def finished(self):
          self.pbar.close()
          self.t_done = time.time()
  
  
  class HTMLProgressBar(BaseProgressBar):
      """
      A simple HTML progress bar for using in IPython notebooks. Based on
      IPython ProgressBar demo notebook:
      https://github.com/ipython/ipython/tree/master/examples/notebooks
  
      Example usage:
  
          n_vec = linspace(0, 10, 100)
          pbar = HTMLProgressBar(len(n_vec))
          for n in n_vec:
              pbar.update()
              compute_with_n(n)
      """
  
      def __init__(self, iterations=0, chunk_size=1.0, **kwargs):
          from IPython.display import HTML, Javascript, display
          import uuid
  
          self.display = display
          self.Javascript = Javascript
          self.divid = str(uuid.uuid4())
          self.textid = str(uuid.uuid4())
          self.pb = HTML(
              '<div style="border: 2px solid grey; width: 600px">\n  '
              f'<div id="{self.divid}" '
              'style="background-color: rgba(121,195,106,0.75); '
              'width:0%">&nbsp;</div>\n'
              '</div>\n'
              f'<p id="{self.textid}"></p>\n'
          )
          self.display(self.pb)
          super()._start(iterations, chunk_size)
  
      def update(self):
          self.n += 1
          n = self.n
          p = (n / self.N) * 100.0
          if p >= self.p_chunk:
              lbl = ("Elapsed time: %s. " % self.time_elapsed() +
                     "Est. remaining time: %s." % self.time_remaining_est(p))
              js_code = f"""
                  document.getElementById('{self.divid}').style.width = '{p}%';
                  document.getElementById('{self.textid}').textContent = '{lbl}';
              """
              self.display(self.Javascript(js_code))
              self.p_chunk += self.p_chunk_size
  
      def finished(self):
          self.t_done = time.time()
          lbl = "Elapsed time: %s" % self.time_elapsed()
          js_code = f"""
              document.getElementById('{self.divid}').style.width = '{100.0}%';
              document.getElementById('{self.textid}').textContent = '{lbl}';
          """
          self.display(self.Javascript(js_code))
  
  
  progress_bars = {
      "Enhanced": EnhancedTextProgressBar,
      "enhanced": EnhancedTextProgressBar,
      "Text": TextProgressBar,
      "text": TextProgressBar,
      True: TextProgressBar,
      "Tqdm": TqdmProgressBar,
      "tqdm": TqdmProgressBar,
      "Html": HTMLProgressBar,
      "html": HTMLProgressBar,
      "base": BaseProgressBar,
      "": BaseProgressBar,
      False: BaseProgressBar,
      None: BaseProgressBar,
  }
  