public async Task LoadAsync()
{
try
{
var weightRecords = await App.Database.GetWeightRecordsAsync();
var count = weightRecords.Count;
if (count > 1)
{
weightRecords = weightRecords.OrderBy(wr => wr.MeasuredAt).ToList();
var itemRecords = await App.Database.GetItemRecordsAsync();
var distribution = new WeightChangeDistribution();
for (int i = 0; i < count - 1; i++)
{
var record1 = weightRecords[i];
var record2 = weightRecords[i + 1];
var weightSpan = new WeightSpan(record1, record2);
var spanItemRecords = itemRecords.Where(ir => ir.At > weightSpan.From && ir.At <= weightSpan.To);
distribution.Add(DistributionStrategy.Distribute(weightSpan, spanItemRecords.ToList()));
}
var items = await App.Database.GetItemsAsync();
Items = GetMealItemViewModels(distribution, items);
SortItems();
}
}
catch (Exception exception)
{
Console.WriteLine(exception);
}
}
protected virtual ObservableCollection <MealItemViewModel> GetMealItemViewModels(
WeightChangeDistribution distribution,
List <Item> items) =>
new ObservableCollection <MealItemViewModel>(
distribution.Select(pair =>
new MealItemViewModel
{
Id = pair.Key,
Name = items.Single(i => i.Id == pair.Key).Name,
Count = pair.Value.Count,
Average = pair.Value.Average(),
Sum = pair.Value.Sum()
})
.OrderByDescending(i => i.Sum));
protected override ObservableCollection <MealItemViewModel> GetMealItemViewModels(WeightChangeDistribution distribution, List <Item> items) =>
new ObservableCollection <MealItemViewModel>(
base.GetMealItemViewModels(distribution, items).Where(vm => vm.Sum > 0));
