private void PerformRecipesLevelMutation(GroupMeal meal, double mutationProbability)
{
if (_random.NextDouble() < mutationProbability)
{
//add new split
var split = new RecipeGroupSplit {
Recipe = _recipesForMealType[meal.MealType].GetRandomItem()
};
var adjustment = new RecipeAdjustment
{
AmountMultiplier = RecipeGroupSplit.Multipliers.GetRandomItem(),
PersonId = _random.Next(_groupSize)
};
var duplicate = meal.Recipes.FirstOrDefault(r => r.Recipe == split.Recipe);
if (duplicate == null)
{
meal.Recipes.Add(split);
}
else if (duplicate.Adjustments.All(a => a.PersonId != adjustment.PersonId))
{
duplicate.Adjustments.Add(adjustment);
}
}
foreach (var recipeGroupSplit in meal.Recipes)
{
if (_random.NextDouble() < mutationProbability)
{
//add adjustment to split
if (recipeGroupSplit.Adjustments.Count < _groupSize)
{
recipeGroupSplit.Adjustments.Add(GetRandomMissingAdjustment(recipeGroupSplit.Adjustments));
}
}
for (var adjIndex = recipeGroupSplit.Adjustments.Count - 1; adjIndex >= 0; adjIndex--)
{
if (!(_random.NextDouble() < mutationProbability))
{
continue;
}
if (_random.NextDouble() < 0.5)
{
//remove adjustment from split
recipeGroupSplit.Adjustments.RemoveAt(adjIndex);
}
else
{
//change multiplier
recipeGroupSplit.Adjustments[adjIndex].AmountMultiplier = RecipeGroupSplit.Multipliers.GetRandomItem();
}
}
}
meal.Recipes.RemoveAll(r => !r.Adjustments.Any());
}
private void DecreaseAjustment(RecipeAdjustment recipeAdjustment)
{
recipeAdjustment.AmountMultiplier = RecipeGroupSplit.Multipliers.First();
}
