using System;
using System.IO;
using System.Runtime.CompilerServices;
using System.Windows;
using Autofac;
using Chernobyl.Utility;

namespace Chernobyl.App.Core
{
    /// <summary>
    /// Extension and utility methods for Autofac.
    /// </summary>
    public static class AutofacExt
    {
        /// <summary>
        /// Binds a resource dictionary with the name "{name}.Templates.xaml" to the provided
        /// <see cref="ContainerBuilder"/> as a service. This name of the template file is automatically
        /// determined by the name of the module file where this method is called. For example, if
        /// the name of the file is "Factories.Module.cs" then 'name' will be "Factories".
        /// </summary>
        /// <param name="builder">The instance to accept the binding.</param>
        /// <param name="callingFilePath">The path of the file where this method is called. Leave this
        /// parameter unfilled and it will be set automatically.</param>
        public static void BindTemplateResourceAuto(this ContainerBuilder builder, [CallerFilePath]string callingFilePath = "")
        {
            builder.BindTemplateResource(GetTemplateNameFromFilePath(callingFilePath));
        }

        /// <summary>
        /// Binds a resource dictionary with the name "{name}.Templates.xaml" to the provided
        /// <see cref="ContainerBuilder"/> as a service.
        /// </summary>
        /// <param name="builder">The instance to accept the binding.</param>
        /// <param name="name">The folder and where the resource dictionary file "{name}.Templates.xaml"
        /// to bind is located.</param>
        public static void BindTemplateResource(this ContainerBuilder builder, string name)
        {
            builder.BindResourceDictionary($"{name}/{name}.Templates.xaml");
        }

        /// <summary>
        /// Binds a resource dictionary with the name "{name}.Styles.xaml" to the provided
        /// <see cref="ContainerBuilder"/> as a service. This name of the template file is automatically
        /// determined by the name of the module file where this method is called. For example, if
        /// the name of the file is "Factories.Module.cs" then 'name' will be "Factories".
        /// </summary>
        /// <param name="builder">The instance to accept the binding.</param>
        /// <param name="callingFilePath">The path of the file where this method is called. Leave this
        /// parameter unfilled and it will be set automatically.</param>
        public static void BindStylesResourceAuto(this ContainerBuilder builder, [CallerFilePath]string callingFilePath = "")
        {
            builder.BindStylesResource(GetTemplateNameFromFilePath(callingFilePath));
        }

        /// <summary>
        /// Binds a resource dictionary with the name "{name}.Styles.xaml" to the provided
        /// <see cref="ContainerBuilder"/> as a service.
        /// </summary>
        /// <param name="builder">The instance to accept the binding.</param>
        /// <param name="name">The folder and where the resource dictionary file "{name}.Styles.xaml"
        /// to bind is located.</param>
        public static void BindStylesResource(this ContainerBuilder builder, string name)
        {
            builder.BindResourceDictionary($"{name}/{name}.Styles.xaml");
        }

        /// <summary>
        /// Binds a resource dictionary to the provided <see cref="ContainerBuilder"/> as a service.
        /// </summary>
        /// <param name="builder">The instance to accept the binding.</param>
        /// <param name="dictionaryUri">The string URI to the resource dictionary to be bound.</param>
        /// <param name="uriKind">Whether the <paramref name="dictionaryUri"/> is relative, absolute, etc.</param>
        public static void BindResourceDictionary(this ContainerBuilder builder, string dictionaryUri, UriKind uriKind = UriKind.Relative)
        {
            builder.Register(context => new ResourceDictionary { Source = new Uri(dictionaryUri, uriKind) });
        }

        /// <summary>
        /// Gets the name of resource dictionary template from a module file path.
        /// </summary>
        static string GetTemplateNameFromFilePath(string moduleFilePath)
        {
            var fileName = Path.GetFileName(moduleFilePath);
            fileName.ThrowIfEmptyOrNull("Resource dictionary template file name");

            var moduleStringIndex = fileName.IndexOf(".Module", StringComparison.Ordinal);
            return fileName.Remove(moduleStringIndex);
        }
    }
}