import json
import logging

# Class to handle session configuration
class SessionConfig:
    """
    Class to handle loading and managing preferred sessions configuration.
    """

    @staticmethod
    def load_preferred_sessions(config_file="preferred_sessions.json"):
        """
        Load preferred sessions from a JSON file.

        Args:
            config_file (str): Path to the JSON file containing preferred sessions.

        Returns:
            List[Tuple[int, str, str]]: List of preferred sessions in the format
                                        (day_of_week, start_time, session_name_contains)
        """
        preferred_sessions = []

        try:
            # Attempt to open and read the JSON file
            with open(config_file, "r") as f:
                data = json.load(f)

                # Validate and parse each item in the JSON data
                for item in data:
                    day_of_week = item.get("day_of_week", 0)  # Default to Monday if not specified
                    start_time = item.get("start_time", "00:00")  # Default to midnight if not specified
                    session_name_contains = item.get("session_name_contains", "")  # Default to empty string if not specified

                    # Append the parsed session to the list
                    preferred_sessions.append((day_of_week, start_time, session_name_contains))

        except FileNotFoundError:
            # Log a warning if the file is not found
            logging.warning(f"Configuration file '{config_file}' not found. Falling back to default settings.")

        except json.JSONDecodeError:
            # Log a warning if the file is not a valid JSON
            logging.warning(f"Failed to decode JSON from file '{config_file}'. Falling back to default settings.")

        # Fallback to default hardcoded sessions if no valid sessions were loaded
        if not preferred_sessions:
            preferred_sessions = [
                (2, "18:30", "CONDITIONING"),   # Wednesday 18:30 CONDITIONING
                (4, "17:00", "WEIGHTLIFTING"),  # Friday 17:00 WEIGHTLIFTING
                (5, "12:30", "HYROX"),          # Saturday 12:30 HYROX
            ]

        return preferred_sessions

# Load preferred sessions using the SessionConfig class
PREFERRED_SESSIONS = SessionConfig.load_preferred_sessions()