public async Task <DrinkCalculationResult> CalculateStatsForUserAsync(string userId, Gender gender, int?weight)
{
DateTime startTimestamp = DateTime.UtcNow.Subtract(TimeSpan.FromHours(NightConsiderationTimespanInHours));
var activity = await this.activityRepository.GetUserActivitiesAsync(userId, startTimestamp, ActivityType.Drink);
var drinkActivity = activity
.Where(a => a.ActivityType == ActivityType.Drink && a.Timestamp >= startTimestamp)
.Select(a =>
new DrinkActivityItem(a.Timestamp, a.DrinkAlcPrc.GetValueOrDefault(), a.DrinkVolume.GetValueOrDefault()));
UserDrinkActivity userDrinkActivity = new UserDrinkActivity(userId, gender, weight.GetValueOrDefault(), drinkActivity);
DrinkCalculationResult result = CalculateStats(userDrinkActivity);
return(result);
}
private DrinkCalculationResult CalculateStats(UserDrinkActivity userDrinkActivity)
{
if (userDrinkActivity.Weight == 0)
{
userDrinkActivity.Weight = DefaultWeight;
}
var orderedAlcoholicDrinks = userDrinkActivity.Drinks.Where(d => d.AlcPrc > 0).OrderBy(d => d.Timestamp).ToList();
orderedAlcoholicDrinks.Add(new DrinkActivityItem(DateTime.UtcNow));
double currentAlcoholization = 0.0;
var factor = userDrinkActivity.Gender == Gender.Female ? 0.61 : 0.69;
for (int i = 0; i < orderedAlcoholicDrinks.Count; i++)
{
var d = orderedAlcoholicDrinks[i];
var tmpPegel = (d.VolMl * d.AlcPrc / 100 * 0.8) / (userDrinkActivity.Weight * factor);
if (i > 0)
{
var timeSinceLastDrink = (d.Timestamp - orderedAlcoholicDrinks[i - 1].Timestamp);
var decay = timeSinceLastDrink.TotalMinutes * 0.002;
if (decay > currentAlcoholization)
{
currentAlcoholization = tmpPegel;
}
else
{
currentAlcoholization += (tmpPegel - decay);
}
}
else
{
currentAlcoholization += tmpPegel;
}
}
currentAlcoholization = Math.Round(currentAlcoholization, 3);
return(new DrinkCalculationResult(userDrinkActivity.UserId, currentAlcoholization, orderedAlcoholicDrinks.Count - 1));
}
