61 lines
2.6 KiB
Python
61 lines
2.6 KiB
Python
from cookbook.helper.unit_conversion_helper import UnitConversionHelper
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from cookbook.models import PropertyType, Unit, Food, FoodProperty, Recipe, Step
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class FoodPropertyHelper:
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space = None
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def __init__(self, space):
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"""
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Helper to perform food property calculations
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:param space: space to limit scope to
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"""
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self.space = space
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def calculate_recipe_properties(self, recipe):
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"""
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Calculate all food properties for a given recipe.
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:param recipe: recipe to calculate properties for
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:return: dict of with property keys and total/food values for each property available
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"""
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ingredients = []
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computed_properties = {}
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property_types = PropertyType.objects.filter(space=self.space).all()
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for s in recipe.steps.all():
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ingredients += s.ingredients.all()
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for fpt in property_types: # TODO is this safe or should I require the request context?
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computed_properties[fpt.id] = {'id': fpt.id, 'name': fpt.name, 'icon': fpt.icon, 'description': fpt.description, 'unit': fpt.unit, 'food_values': {}, 'total_value': 0, 'missing_value': False}
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# TODO unit conversion support
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uch = UnitConversionHelper(self.space)
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for i in ingredients:
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conversions = [i] # uch.get_conversions(i)
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for pt in property_types:
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found_property = False
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for p in i.food.foodproperty_set.all():
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if p.property_type == pt:
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for c in conversions:
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if c.unit == p.food_unit:
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found_property = True
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computed_properties[pt.id]['total_value'] += (c.amount / p.food_amount) * p.property_amount
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computed_properties[pt.id]['food_values'] = self.add_or_create(computed_properties[p.property_type.id]['food_values'], c.food.id, (c.amount / p.food_amount) * p.property_amount, c.food)
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if not found_property:
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computed_properties[pt.id]['missing_value'] = True
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computed_properties[pt.id]['food_values'][i.food.id] = {'id': i.food.id, 'food': i.food.name, 'value': 0}
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return computed_properties
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# small dict helper to add to existing key or create new, probably a better way of doing this
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# TODO move to central helper ?
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@staticmethod
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def add_or_create(d, key, value, food):
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if key in d:
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d[key]['value'] += value
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else:
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d[key] = {'id': food.id, 'food': food.name, 'value': value}
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return d
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