/// <summary>
/// Creates walks on the week days. Calculates how much each walk costs according to the rates provided.
/// </summary>
public IEnumerable <Walk> Build(WeekDaysSchedulePayload payload)
{
var packsWithDogs = payload?.DogPacks?.Where(dp => dp.Dogs?.Any() ?? false).ToList();
if (!packsWithDogs?.Any() ?? true || payload?.WorkingDays == null)
{
return(Enumerable.Empty <Walk>());
}
var getDogPack = BuildDogPackFetcher();
return(Range(payload.DateFrom, payload.DateTo)
.Where(d => d.IsWeekDay())
.SelectMany(date => CreateWalks(date, getDogPack, payload)));
// Returns function which gets dog packs one by one in turn
Func <DogPack> BuildDogPackFetcher()
{
var dogPacksQueue = new Queue <DogPack>();
return(() =>
{
if (!dogPacksQueue.Any())
{
dogPacksQueue = new Queue <DogPack>(packsWithDogs);
}
return dogPacksQueue.Dequeue();
});
}
}
IEnumerable <Walk> CreateWalks(DateTime date, Func <DogPack> getDogPack, WeekDaysSchedulePayload payload)
{
return(payload.WorkingDays
.FirstOrDefault(ds => ds.DayOfWeek == date.DayOfWeek)
?.WorkingHours
.Where(InTimeBoundaries)
.Select(CreateWalk) ?? Enumerable.Empty <Walk>());
Walk CreateWalk(TimeSpan time)
{
var pack = getDogPack();
return(new Walk
{
StartDateTime = date.Date + time,
DogPack = pack,
Duration = payload.WalkDuration,
Price = CalcPrice(pack)
});
}
decimal CalcPrice(DogPack pack)
{
Dog firstDog = pack.Dogs.First();
var(size, isAggressive) = (firstDog.Size, firstDog.IsAggressive);
var rate = payload.PriceRates
.FirstOrDefault(pr => pr.DogSize == size &&
pr.IsAggressive == isAggressive);
return(pack.Dogs.Count * rate.PricePerWalk);
}
bool InTimeBoundaries(TimeSpan wh) =>
date.Date == payload.Now.Date ?
wh >= payload.Now.TimeOfDay && payload.Now.TimeOfDay <= wh : true;
}
public WeeklySchedulePayloadBuilder(WeekDaysSchedulePayload payload = null)
{
_payload = payload ?? Default();
}
