import cv2
import time
import requests
import numpy as np
from datetime import datetime
import os
import json
import logging
import argparse

class CameraMonitor:
    def __init__(self, config, logger):
        self.config = config
        self.logger = logger
        
    def initialize_camera(self):
        """
        Initialize the camera and return the VideoCapture object.
        """
        cap = cv2.VideoCapture(self.config['camera_address'])
        if not cap.isOpened():
            raise Exception(f"Failed to open camera at {self.config['camera_address']}")
        return cap

    def log_scene_change(self):
        """
        Log a scene change notification to the Scenesense server.
        """
        current_time = int(time.time())
        human_readable_time = datetime.utcfromtimestamp(current_time).strftime('%Y-%m-%d %H:%M:%S')
        description = f'Scene change detected at {human_readable_time}'
        payload = {'timestamp': current_time, 'description': description}

        try:
            response = requests.post(self.config['api_url'], json=payload)
            response.raise_for_status()
            self.logger.info(f'Scene change logged: {description}')
        except requests.exceptions.RequestException as e:
            self.logger.error(f'Error connecting to Scenesense server: {e}')
        except requests.exceptions.HTTPError as e:
            self.logger.error(f'HTTP error: {e}')

    def detect_scene_change(self, previous_frame, current_frame):
        """
        Detect scene change based on frame differences.
        """
        frame_diff = cv2.absdiff(previous_frame, current_frame)
        mean_diff = np.mean(frame_diff)
        return mean_diff > self.config['sensitivity_threshold']

    def run(self):
        try:
            with self.initialize_camera() as cap:
                previous_frame = None

                while True:
                    ret, current_frame = cap.read()

                    if not ret:
                        raise Exception("Failed to read frame")

                    if previous_frame is not None:
                        if self.detect_scene_change(previous_frame, current_frame):
                            self.log_scene_change()

                        previous_frame = current_frame

        except KeyboardInterrupt:
            self.logger.info("Camera monitoring stopped by user.")
        except Exception as e:
            self.logger.error(f"An error occurred: {e}")

def parse_command_line_args():
    parser = argparse.ArgumentParser(description='Camera Monitor for Scenesense')
    parser.add_argument('--config', type=str, default='config.json', help='Path to configuration file')
    return parser.parse_args()

def load_config(config_path):
    try:
        with open(config_path, 'r') as config_file:
            return json.load(config_file)
    except FileNotFoundError:
        raise Exception(f"Config file not found: {config_path}")
    except json.JSONDecodeError:
        raise Exception(f"Invalid JSON format in config file: {config_path}")

def setup_logging():
    logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    return logging.getLogger('CameraMonitor')

def main():
    args = parse_command_line_args()
    config = load_config(args.config)
    logger = setup_logging()

    monitor = CameraMonitor(config, logger)
    monitor.run()

if __name__ == "__main__":
    main()