using System;
using System.ComponentModel;
using System.Globalization;
using Microsoft.AspNetCore.Mvc.ModelBinding.Binders;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace Microsoft.AspNetCore.Mvc.ModelBinding
{
	/// <summary>
	/// An <see cref="IModelBinderProvider"/> for binding <see cref="decimal"/>, <see cref="double"/>,
	/// <see cref="float"/>, and their <see cref="Nullable{T}"/> wrappers.
	/// Modified to set <see cref="NumberStyles"/> and <see cref="System.Globalization.CultureInfo"/>.
	/// </summary>
	/// <remarks>
	/// To use this provider, insert it at the beginning of the providers list:<br/>
	/// <code>
	/// services.AddControllersWithViews(options =><br/>
	/// {<br/>
	/// 	options.ModelBinderProviders.Insert(0, new CustomFloatingPointModelBinderProvider());<br/>
	/// });</code>
	/// </remarks>
	public class InvariantFloatingPointModelBinderProvider : IModelBinderProvider
	{
		/// <summary>
		/// Gets or sets the supported <see cref="NumberStyles"/> globally.
		/// Default: <see cref="NumberStyles.Float"/> and <see cref="NumberStyles.AllowThousands"/>.
		/// </summary>
		/// <remarks>
		/// <see cref="SimpleTypeModelBinder"/> uses <see cref="DecimalConverter"/> and similar. Those <see cref="TypeConverter"/>s default to <see cref="NumberStyles.Float"/>.
		/// </remarks>
		public static NumberStyles SupportedNumberStyles { get; set; } = NumberStyles.Float | NumberStyles.AllowThousands;

		/// <summary>
		/// Gets or sets the <see cref="System.Globalization.CultureInfo"/> to use while parsing globally.
		/// Default: <see cref="CultureInfo.InvariantCulture"/>.
		/// </summary>
		public static CultureInfo CultureInfo { get; set; } = CultureInfo.InvariantCulture;

		/// <inheritdoc />
		public IModelBinder GetBinder(ModelBinderProviderContext context)
		{
			if (context == null)
				throw new ArgumentNullException(nameof(context));

			var loggerFactory = context.Services.GetRequiredService<ILoggerFactory>();
			var modelType = context.Metadata.UnderlyingOrModelType;
			if (modelType == typeof(decimal) ||
				modelType == typeof(double) ||
				modelType == typeof(float))
			{
				return new InvariantFloatingPointModelBinder(SupportedNumberStyles, CultureInfo, loggerFactory);
			}

			return null;
		}
	}
}