#!/usr/bin/env python3

import logging
import os
import time
from typing import List, Tuple, Optional

import trigger


logger = logging.getLogger(__file__)


class any_camera_trigger(trigger.trigger):
    def __init__(self):
        self.triggers_in_the_past_seven_min = {
            "driveway": 0,
            "frontdoor": 0,
            "doorbell": 0,
            "cabin_driveway": 0,
        }
        self.last_trigger_timestamp = {
            "driveway": 0,
            "frontdoor": 0,
            "doorbell": 0,
            "cabin_driveway": 0,
        }

    def choose_priority(self, camera: str, age: int) -> int:
        """Based on the camera name and last trigger age, compute priority."""
        base_priority_by_camera = {
            "driveway": 3,
            "frontdoor": 2,
            "doorbell": 1,
            "cabin_driveway": 3,
        }
        priority = base_priority_by_camera[camera]
        if age < 10:
            priority += trigger.trigger.PRIORITY_HIGH
        elif age < 30:
            priority += trigger.trigger.PRIORITY_NORMAL + age
        else:
            priority += trigger.trigger.PRIORITY_LOW
        return priority

    def get_triggered_page_list(self) -> Optional[List[Tuple[str, int]]]:
        """Return a list of triggered pages with priorities."""
        triggers = []
        num_cameras_with_recent_triggers = 0
        camera_list = ["driveway", "frontdoor", "doorbell", "cabin_driveway"]

        now = time.time()
        try:
            # First pass, just see whether each camera is triggered
            # and, if so, count how many times in the past 7m it has
            # been triggered.
            for camera in camera_list:
                filename = f"/timestamps/last_camera_motion_{camera}"
                ts = os.stat(filename).st_ctime
                age = now - ts
                if ts != self.last_trigger_timestamp[camera] and age < 10:
                    logger.info(f'{camera} is triggered; {filename} touched {age}s ago (@{ts}')
                    self.last_trigger_timestamp[camera] = ts
                    num_cameras_with_recent_triggers += 1

                    self.triggers_in_the_past_seven_min[camera] = 0
                    filename = f"/timestamps/camera_motion_history_{camera}"
                    with open(filename, "r") as f:
                        contents = f.readlines()
                    for x in contents:
                        x = x.strip()
                        age = now - int(x)
                        if age < (60 * 7):
                            self.triggers_in_the_past_seven_min[camera] += 1

            # Second pass, see whether we want to trigger due to
            # camera activity we found.  All cameras timestamps were
            # just considered and should be up-to-date.  Some logic to
            # squelch spammy cameras unless more than one is triggered
            # at the same time.
            for camera in camera_list:
                if (now - self.last_trigger_timestamp[camera]) < 10:
                    if (
                        self.triggers_in_the_past_seven_min[camera] <= 4
                        or num_cameras_with_recent_triggers > 1
                    ):
                        logger.info(f'{camera} has {self.triggers_in_the_past_seven_min[camera]} triggers in the past 7d.')
                        logger.info(f'{num_cameras_with_recent_triggers} cameras are triggered right now.')

                        age = now - self.last_trigger_timestamp[camera]
                        priority = self.choose_priority(camera, int(age))
                        logger.info(f'*** CAMERA TRIGGER (hidden/{camera}.html @ {priority}) ***')
                        triggers.append(
                            (
                                f"hidden/unwrapped_{camera}.html",
                                priority,
                            )
                        )
                    else:
                        logger.info(f'{camera} is too spammy; {self.triggers_in_the_past_seven_min[camera]} events in the past 7m.  Ignoring it.')
        except Exception as e:
            logger.exception(e)

        if len(triggers) == 0:
            return None
        else:
            logger.info('There are active camera triggers!')
            return triggers


# x = any_camera_trigger()
# print(x.get_triggered_page_list())