models.py

"""
Data parsing functions to convert MyFitnessPal objects to database-ready dictionaries.
"""


def parse_food_entry(date, meal_name, entry):
    """
    Convert MyFitnessPal food entry object to database dictionary.
    
    NOTE: MyFitnessPal API only provides these nutrients in entry.totals:
    - calories, carbohydrates, fat, protein, sodium, sugar
    
    Other nutrients (fiber, vitamins, minerals) are not available through
    the API and will always be null.
    
    Args:
        date: datetime.date object
        meal_name: Name of meal (e.g., "Breakfast", "Lunch")
        entry: MyFitnessPal Entry object
        
    Returns:
        dict: Dictionary with all food entry fields
    """
    return {
        'date': date,
        'meal_type': meal_name.lower(),
        'food_name': entry.name,
        'short_name': getattr(entry, 'short_name', None),
        'quantity': float(entry.quantity) if hasattr(entry, 'quantity') and entry.quantity else None,
        'unit': getattr(entry, 'unit', None),
        # Only these nutrients are available from MyFitnessPal API
        'calories': entry.totals.get('calories'),
        'carbohydrates': entry.totals.get('carbohydrates'),
        'fat': entry.totals.get('fat'),
        'protein': entry.totals.get('protein'),
        'sodium': entry.totals.get('sodium'),
        'sugar': entry.totals.get('sugar'),
    }


def parse_exercise(date, exercise_type, entry):
    """
    Convert MyFitnessPal exercise entry to database dictionary.
    
    Args:
        date: datetime.date object
        exercise_type: Type of exercise ('cardiovascular' or 'strength training')
        entry: Individual exercise entry dict from exercise.get_as_list()
        
    Returns:
        dict: Dictionary with exercise entry fields
    """
    # Get nutrition information from the entry
    nutrition_info = entry.get('nutrition_information', {})
    
    return {
        'date': date,
        'exercise_type': exercise_type,
        'exercise_name': entry.get('name'),
        'calories_burned': nutrition_info.get('calories burned'),
        'duration_minutes': nutrition_info.get('minutes'),
        # Strength training fields (will be None for cardiovascular exercises)
        'sets': nutrition_info.get('sets'),
        'reps_per_set': nutrition_info.get('reps/set'),
        'weight_per_set': nutrition_info.get('weight/set'),
    }


def parse_weight_measurement(date, weight_value):
    """
    Convert MyFitnessPal weight measurement to database dictionary.
    
    Args:
        date: datetime.date object
        weight_value: float weight in pounds from MyFitnessPal
        
    Returns:
        dict: Dictionary with weight measurement fields
    """
    return {
        'date': date,
        'weight_lbs': float(weight_value) if weight_value is not None else None,
    }