using Microsoft.Extensions.Caching.Memory;

public class WeatherForecastService
{
    private static readonly string[] summaries = new[]
    {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild",
        "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };

    public WeatherForecastService(IMemoryCache memoryCache)
    {
        MemoryCache = memoryCache;
    }

    public IMemoryCache MemoryCache { get; }

    public Task<WeatherForecast[]?> GetForecastAsync(DateTime startDate)
    {
        return MemoryCache.GetOrCreateAsync(startDate, async e =>
        {
            e.SetOptions(new MemoryCacheEntryOptions
            {
                AbsoluteExpirationRelativeToNow =
                    TimeSpan.FromSeconds(30)
            });

            var rng = new Random();

            await Task.Delay(TimeSpan.FromSeconds(10));

            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = startDate.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = summaries[rng.Next(summaries.Length)]
            }).ToArray();
        });
    }
}
