using NetCore.AutoRegisterDi;
using Microsoft.Extensions.Configuration;
using CaddyManager.Contracts.Configurations;

namespace CaddyManager.Services.Configurations;

/// <inheritdoc />
[RegisterAsSingleton]
public class ConfigurationsService(IConfiguration configuration) : IConfigurationsService
{
    /// <inheritdoc />
    public T Get<T>() where T : class
    {
        var section = typeof(T).Name;
        
        // Have the configuration section name be the section name without the "Configurations" suffix
        if (section.EndsWith("Configurations"))
            section = section[..^"Configurations".Length];
        else if (section.EndsWith("Configuration"))
            section = section[..^"Configuration".Length];
        
        var result = configuration.GetSection(section).Get<T>();
        var defaults = Activator.CreateInstance<T>();

        if (result is null) return defaults;

        // The .NET 10 binder writes nulls over property initialisers, so put the defaults back
        foreach (var property in typeof(T).GetProperties())
        {
            if (property is { CanRead: true, CanWrite: true } && property.GetValue(result) is null)
                property.SetValue(result, property.GetValue(defaults));
        }

        return result;
    }
}