Learn-WinUI-3-Second-Edition/Chapter13/Start/UnoMediaCollection/UnoMediaCollection.Server/Apis/WeatherForecastApi.cs

namespace UnoMediaCollection.Server.Apis
{
    internal static class WeatherForecastApi
    {
        private const string Tag = "Weather";
        private static readonly string[] Summaries = new[]
        {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };

        internal static WebApplication MapWeatherApi(this WebApplication app)
        {
            app.MapGet("/api/weatherforecast", GetForecast)
                .WithTags(Tag)
                .WithName(nameof(GetForecast));
            return app;
        }

        /// <summary>
        /// Creates a make believe weather forecast for the next 5 days.
        /// </summary>
        /// <param name="loggerFactory"></param>
        /// <returns>A fake 5 day forecast</returns>
        /// <remarks>A 5 Day Forecast</remarks>
        /// <response code="200">Weather Forecast returned</response>
        [Produces("application/json")]
        [ProducesResponseType(typeof(IEnumerable<WeatherForecast>), 200)]
        private static IEnumerable<WeatherForecast> GetForecast(ILoggerFactory loggerFactory)
        {
            var logger = loggerFactory.CreateLogger(nameof(WeatherForecastApi));
            logger.LogDebug("Getting Weather Forecast.");

            return Enumerable.Range(1, 5).Select(index =>
                new WeatherForecast(
                    DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
                    Random.Shared.Next(-20, 55),
                    Summaries[Random.Shared.Next(Summaries.Length)]
                )
            )
            .Select(x =>
            {
                logger.LogInformation("Weather forecast for {Date} is a {Summary} {TemperatureC}°C", x.Date, x.Summary, x.TemperatureC);
                return x;
            })
            .ToArray();
        }
    }
}