import io
from collections.__init__ import defaultdict
from datetime import timedelta

import numpy as np
from django.http import HttpResponse
from django.views.generic import DetailView

from web.models import User, ActivityLog, Activity


class UserChartsPie(DetailView):
  model = User
  pk_url_kwarg = 'user_id'

  def pie_chart(self, plt, ax, logs):
    total_time = defaultdict(float)

    for log in logs:
      total_time[str(log.activity)] += (log.end_time - log.start_time).total_seconds()

    sectors = sorted(list(total_time.items()), key=lambda x: x[1])

    ax.pie(x=[i[1] for i in sectors], labels=[i[0] for i in sectors], autopct='%1.0f%%')

  def average_chart(self, plt, ax, logs):
    interval = timedelta(minutes=10)
    interval_count = timedelta(days=1) // interval
    intervals = [(interval * i) / timedelta(hours=1) for i in range(interval_count)]

    distr_by_activity = {}
    for i in logs:
      if i.activity not in distr_by_activity:
        distr_by_activity[i.activity] = np.zeros(interval_count)

    for i in logs:
      day = i.start_time.replace(hour=0, minute=0, second=0, microsecond=0)

      t = i.start_time
      t_i = (t - day) // interval

      while t < i.end_time:
        distr_by_activity[i.activity][t_i] += 1

        t += interval
        t_i = (t_i + 1) % interval_count

    for activity, distr in distr_by_activity.items():
      ax.plot(intervals, distr, label=f'{activity}')

      distr[0] = 0
      distr[-1] = 0
      ax.fill(intervals, distr, alpha=0.2)

    plt.legend()

  def render_to_response(self, context, **response_kwargs):
    logs = ActivityLog.objects.filter(user=self.object).all()

    import matplotlib
    matplotlib.use('Agg')
    import matplotlib.pyplot as plt
    fig = plt.figure(figsize=(12, 16), dpi=100)

    ax = fig.add_subplot(221)
    self.pie_chart(plt, ax, logs)

    ax = fig.add_subplot(212)
    self.average_chart(plt, ax, logs)

    buf = io.BytesIO()
    fig.savefig(buf, format='png')
    b = buf.getvalue()
    return HttpResponse(b, content_type='image/png')


class UserChartsActivityAll(DetailView):
  model = User
  pk_url_kwarg = 'user_id'

  def get_context_data(self, **kwargs):
    context = super().get_context_data(**kwargs)
    context['activity'] = Activity.objects.filter(id=self.kwargs['activity_id']).first()
    return context

  def bar_chart(self, plt, ax, logs, day_l, day_r, day_count, days):
    day_seconds = np.zeros(day_count)

    for log in logs:
      for i, day in enumerate(days):
        l = max(log.start_time, day)
        r = min(log.end_time, day + timedelta(days=1))

        if r > l:
          day_seconds[i] += (r - l).total_seconds()

    day_hours = day_seconds / timedelta(hours=1).total_seconds()

    ax.bar(days, day_hours)
    ax.hlines([np.mean(day_hours)], day_l, day_r, color='orange', lw=3)
    plt.xticks(days, [f'{i:%m-%d}' for i in days], rotation=60)
    plt.ylabel('кол-во часов')

  def tracker_chart(self, plt, ax, logs, day_l, day_r, day_count, days):
    ys = []
    widths = []
    lefts = []

    for log in logs:
      for i, day in enumerate(days):
        l = max(log.start_time, day)
        r = min(log.end_time, day + timedelta(days=1))

        if r > l:
          ys.append(day)
          widths.append((r - l) / timedelta(hours=1))
          lefts.append((l - day) / timedelta(hours=1))

    ax.barh(y=ys, width=widths, left=lefts, zorder=2)
    plt.xlim(0, 24)
    plt.xticks(range(24), [f'{i:02d}:00' for i in range(24)])
    plt.yticks(days, [f'{i:%m-%d}' for i in days])
    plt.grid(True, zorder=1)

  def average_chart(self, plt, ax, logs, day_l, day_r, day_count, days):
    pass

  def render_to_response(self, context, **response_kwargs):
    logs = ActivityLog.objects.filter(user=self.object).all()
    day_r = logs[-1].end_time.replace(hour=0, minute=0, second=0, microsecond=0)
    day_l = max(
      logs[0].start_time.replace(hour=0, minute=0, second=0, microsecond=0),
      day_r - timedelta(days=13)
    )
    day_count = (day_r - day_l) // timedelta(days=1) + 1
    days = [day_l + timedelta(days=1) * i for i in range(day_count)]

    import matplotlib
    matplotlib.use('Agg')
    import matplotlib.pyplot as plt
    fig = plt.figure(figsize=(8, 12), dpi=100)

    ax = fig.add_subplot(311)
    self.bar_chart(plt, ax, logs, day_l, day_r, day_count, days)

    ax = fig.add_subplot(312)
    self.tracker_chart(plt, ax, logs, day_l, day_r, day_count, days)

    ax = fig.add_subplot(313)
    self.average_chart(plt, ax, logs, day_l, day_r, day_count, days)

    buf = io.BytesIO()
    fig.savefig(buf, format='png')
    b = buf.getvalue()
    return HttpResponse(b, content_type='image/png')


class UserActivityChartsTracker(DetailView):
  model = User
  pk_url_kwarg = 'user_id'

  def get_context_data(self, **kwargs):
    context = super().get_context_data(**kwargs)
    context['activity'] = Activity.objects.filter(id=self.kwargs['activity_id']).first()
    return context

  def render_to_response(self, context, **response_kwargs):
    print('start_tracker')
    import matplotlib
    matplotlib.use('Agg')
    import matplotlib.pyplot as plt
    fig = plt.figure(figsize=(16, 6), dpi=100)
    ax = fig.add_subplot(111)

    logs = list(ActivityLog.objects.filter(user=self.object, activity=context['activity']).order_by('start_time').all())

    day_r = logs[-1].end_time.replace(hour=0, minute=0, second=0, microsecond=0)
    day_l = max(
      logs[0].start_time.replace(hour=0, minute=0, second=0, microsecond=0),
      day_r - timedelta(days=14)
    )

    day_count = (day_r - day_l) // timedelta(days=1) + 1

    days = [day_l + timedelta(days=1) * i for i in range(day_count)]

    buf = io.BytesIO()
    fig.savefig(buf, format='png')
    b = buf.getvalue()
    return HttpResponse(b, content_type='image/png')