using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.StaticFiles;
using Microsoft.Extensions.FileProviders;
using Microsoft.Extensions.Options;

namespace Infrastructure.UI
{
    public class FileConfigureOptions : IPostConfigureOptions<StaticFileOptions>
    {
        private readonly List<string> _assemblies;
        private List<IFileProvider> _providers = new List<IFileProvider>();

        public FileConfigureOptions(IWebHostEnvironment environment)
        {
            Environment = environment;
        }

        public FileConfigureOptions(IWebHostEnvironment environment, List<string> assemblies) : this(environment)
        {
            this._assemblies = assemblies;
        }

        public IWebHostEnvironment Environment { get; }

        public void PostConfigure(string name, StaticFileOptions options)
        {
            name = name ?? throw new ArgumentNullException(nameof(name));
            options = options ?? throw new ArgumentNullException(nameof(options));

            options.ServeUnknownFileTypes = true;
            var contentTypeProvider = new FileExtensionContentTypeProvider();
            contentTypeProvider.Mappings.Add(".apk", "application/vnd.android.package-archive");
            options.ContentTypeProvider = contentTypeProvider;
            if (options.FileProvider == null && Environment.WebRootFileProvider == null)
            {
#pragma warning disable CA1303 // 请不要将文本作为本地化参数传递
                throw new InvalidOperationException("Missing FileProvider.");
#pragma warning restore CA1303 // 请不要将文本作为本地化参数传递
            }
            if (this._providers == null)
            {
                this._providers = new List<IFileProvider>();
            }
            this._providers.Add(new PhysicalFileProvider(Path.Combine(Directory.GetCurrentDirectory(), "wwwroot")));
            //this._providers.Add(new ManifestEmbeddedFileProvider(GetType().Assembly, "wwwroot"));
            if (_assemblies != null && _assemblies.Count > 0)
            {
                var list = AppDomain.CurrentDomain.GetAssemblies().Where(o => !o.FullName.StartsWith("System", StringComparison.Ordinal) && !o.FullName.StartsWith("Microsoft", StringComparison.Ordinal));
                foreach (var item in list)
                {
                    if (this._assemblies.Contains(item.GetName().Name))
                    {
                        this._providers.Add(new ManifestEmbeddedFileProvider(item, "wwwroot"));
                    }
                }
            }
            options.FileProvider = new CompositeFileProvider(this._providers.ToArray());
        }
    }
}