#!/usr/bin/env python3
import copy
import json
import os
import unittest
import random
from PIL import Image, ImageDraw, ImageFont

from cereal import log, car
from cereal.messaging import SubMaster
from common.basedir import BASEDIR
from common.params import Params
from selfdrive.controls.lib.events import Alert, EVENTS, ET
from selfdrive.controls.lib.alertmanager import set_offroad_alert
from selfdrive.test.process_replay.process_replay import CONFIGS

AlertSize = log.ControlsState.AlertSize

OFFROAD_ALERTS_PATH = os.path.join(BASEDIR, "selfdrive/controls/lib/alerts_offroad.json")

# TODO: add callback alerts
ALERTS = []
for event_types in EVENTS.values():
  for alert in event_types.values():
    ALERTS.append(alert)


class TestAlerts(unittest.TestCase):

  @classmethod
  def setUpClass(cls):
    with open(OFFROAD_ALERTS_PATH) as f:
      cls.offroad_alerts = json.loads(f.read())

      # Create fake objects for callback
      cls.CS = car.CarState.new_message()
      cls.CP = car.CarParams.new_message()
      cfg = [c for c in CONFIGS if c.proc_name == 'controlsd'][0]
      cls.sm = SubMaster(cfg.pubs)

  def test_events_defined(self):
    # Ensure all events in capnp schema are defined in events.py
    events = car.CarEvent.EventName.schema.enumerants

    for name, e in events.items():
      if not name.endswith("DEPRECATED"):
        fail_msg = "%s @%d not in EVENTS" % (name, e)
        self.assertTrue(e in EVENTS.keys(), msg=fail_msg)

  # ensure alert text doesn't exceed allowed width
  def test_alert_text_length(self):
    font_path = os.path.join(BASEDIR, "selfdrive/assets/fonts")
    regular_font_path = os.path.join(font_path, "Inter-SemiBold.ttf")
    bold_font_path = os.path.join(font_path, "Inter-Bold.ttf")
    semibold_font_path = os.path.join(font_path, "Inter-SemiBold.ttf")

    max_text_width = 2160 - 300  # full screen width is usable, minus sidebar
    draw = ImageDraw.Draw(Image.new('RGB', (0, 0)))

    fonts = {
      AlertSize.small: [ImageFont.truetype(semibold_font_path, 74)],
      AlertSize.mid: [ImageFont.truetype(bold_font_path, 88),
                      ImageFont.truetype(regular_font_path, 66)],
    }

    for alert in ALERTS:
      if not isinstance(alert, Alert):
        alert = alert(self.CP, self.CS, self.sm, metric=False, soft_disable_time=100)

      # for full size alerts, both text fields wrap the text,
      # so it's unlikely that they  would go past the max width
      if alert.alert_size in (AlertSize.none, AlertSize.full):
        continue

      for i, txt in enumerate([alert.alert_text_1, alert.alert_text_2]):
        if i >= len(fonts[alert.alert_size]):
          break

        font = fonts[alert.alert_size][i]
        left, _, right, _ = draw.textbbox((0, 0), txt, font)
        width = right - left
        msg = f"type: {alert.alert_type} msg: {txt}"
        self.assertLessEqual(width, max_text_width, msg=msg)

  def test_alert_sanity_check(self):
    for event_types in EVENTS.values():
      for event_type, a in event_types.items():
        # TODO: add callback alerts
        if not isinstance(a, Alert):
          continue

        if a.alert_size == AlertSize.none:
          self.assertEqual(len(a.alert_text_1), 0)
          self.assertEqual(len(a.alert_text_2), 0)
        elif a.alert_size == AlertSize.small:
          self.assertGreater(len(a.alert_text_1), 0)
          self.assertEqual(len(a.alert_text_2), 0)
        elif a.alert_size == AlertSize.mid:
          self.assertGreater(len(a.alert_text_1), 0)
          self.assertGreater(len(a.alert_text_2), 0)
        else:
          self.assertGreater(len(a.alert_text_1), 0)

        self.assertGreaterEqual(a.duration, 0.)

        if event_type not in (ET.WARNING, ET.PERMANENT, ET.PRE_ENABLE):
          self.assertEqual(a.creation_delay, 0.)

  def test_offroad_alerts(self):
    params = Params()
    for a in self.offroad_alerts:
      # set the alert
      alert = copy.copy(self.offroad_alerts[a])
      set_offroad_alert(a, True)
      alert['extra'] = ''
      self.assertTrue(json.dumps(alert) == params.get(a, encoding='utf8'))

      # then delete it
      set_offroad_alert(a, False)
      self.assertTrue(params.get(a) is None)

  def test_offroad_alerts_extra_text(self):
    params = Params()
    for i in range(50):
      # set the alert
      a = random.choice(list(self.offroad_alerts))
      alert = self.offroad_alerts[a]
      set_offroad_alert(a, True, extra_text="a"*i)

      written_alert = json.loads(params.get(a, encoding='utf8'))
      self.assertTrue("a"*i == written_alert['extra'])
      self.assertTrue(alert["text"] == written_alert['text'])

if __name__ == "__main__":
  unittest.main()
