using System;
using System.Collections.Generic;
using System.Configuration;
using System.Globalization;
using System.Linq;
using System.Net.Http;
using System.Reflection;
using System.Web.Http;
using System.Web.Http.Description;
using Kreta.Core.Configuratiaton;
using Kreta.Core.Enum;
using Kreta.Core.Exceptions;
using Kreta.Naplo.Dto.V3.Attributes;
using Kreta.Naplo.WebApi;
using Swashbuckle.Application;
using Swashbuckle.Examples;
using Swashbuckle.Swagger;
using WebActivatorEx;

[assembly: PreApplicationStartMethod(typeof(SwaggerConfig), nameof(SwaggerConfig.Register))]
namespace Kreta.Naplo.WebApi
{
    public class SwaggerConfig
    {
        private static readonly string Header = "header";

        public class SwaggerChangeTypeFilter : ISchemaFilter
        {
            public void Apply(Schema schema, SchemaRegistry schemaRegistry, Type type)
            {
                if (schema?.properties == null || type == null)
                {
                    return;
                }

                var selectedProperties = type.GetProperties().Where(t => t.GetCustomAttribute<SwaggerChangeTypeAttribute>() != null);

                foreach (var property in selectedProperties)
                {
                    var x = schema.properties[property.Name];
                    if (property.GetCustomAttribute<SwaggerChangeTypeAttribute>().NewType == typeof(string))
                    {
                        x.@ref = null;
                        x.type = "string";
                    }
                    else
                    {
                        throw new BlException(BlExceptionType.ElvartErtekNemTalalhato);
                    }

                }
            }
        }

        public static void Register()
        {
            if (bool.Parse(ConfigurationManager.AppSettings["IsSwaggerUiEnabled"]))
            {
                var thisAssembly = typeof(SwaggerConfig).Assembly;
                GlobalConfiguration.Configuration
                    .EnableSwagger(c =>
                    {
                        c.MultipleApiVersions(
                                (apiDesc, targetApiVersion) => ResolveVersionSupportByRouteConstraint(apiDesc, targetApiVersion),
                                    (vc) =>
                                    {
                                        _ = vc.Version(V3.Constants.RoutePrefix, $"Kreta.Naplo.WebApi {V3.Constants.RoutePrefix}");
                                        _ = vc.Version(V2.VersionedRouteInfo.RoutePrefix, $"Kreta.Naplo.WebApi {V2.VersionedRouteInfo.RoutePrefix}");
                                    }
                                );

                        c.IncludeXmlComments(string.Format(@"{0}\App_Data\Kreta.Naplo.WebApi.XML", AppDomain.CurrentDomain.BaseDirectory));
                        c.IncludeXmlComments(string.Format(@"{0}\App_Data\Kreta.Naplo.Dto.XML", AppDomain.CurrentDomain.BaseDirectory));
                        c.OperationFilter<ExamplesOperationFilter>();
                        c.OperationFilter<DescriptionOperationFilter>();
                        c.UseFullTypeNameInSchemaIds();

                        _ = c.ApiKey("Token")
                         .Description("Filling bearer token here")
                         .Name("Authorization").Name("ApiKey")
                         .In(Header);

                        c.OperationFilter(() => new AddAuthorizationHeaderParameter());
                        c.SchemaFilter<SwaggerChangeTypeFilter>();
                        c.RootUrl(ResolveBasePath);
                    })
                    .EnableSwaggerUi(c =>
                    {
                        c.InjectStylesheet(thisAssembly, "Kreta.Naplo.WebApi.Content.naplo-swagger-ui-custom.css");
                        c.DocExpansion(DocExpansion.List);
                        c.EnableApiKeySupport("Authorization", "header");
                    });
            }
        }

        private static bool ResolveVersionSupportByRouteConstraint(ApiDescription apiDesc, string targetApiVersion)
        {
            string[] path = apiDesc.RelativePath.Split(new[] { '/' });
            string pathVersion = path[0];

            return CultureInfo.InvariantCulture.CompareInfo.IndexOf(pathVersion, targetApiVersion, CompareOptions.IgnoreCase) >= 0;
        }

        private static string ResolveBasePath(HttpRequestMessage message)
        {
            var virtualPathRoot = message.GetRequestContext().VirtualPathRoot;
            var schemeAndHost = "https://" + message.RequestUri.Host;
            return new Uri(new Uri(schemeAndHost, UriKind.Absolute), virtualPathRoot).AbsoluteUri;
        }

        private class AddAuthorizationHeaderParameter : IOperationFilter
        {
            public void Apply(Operation operation, SchemaRegistry schemaRegistry, ApiDescription apiDescription)
            {
                if (operation.parameters == null)
                {
                    operation.parameters = new List<Parameter>();
                }
                operation.parameters.Add(new Parameter
                {
                    name = "Authorization",
                    @in = Header,
                    description = "access token",
                    required = false,
                    type = "string"
                });
                if (ApiKeyConfiguration.Instance.Enabled)
                {
                    operation.parameters.Add(new Parameter
                    {
                        name = "ApiKey",
                        @in = Header,
                        description = "Header-ben levő Api kulcs védelem",
                        required = false,
                        type = "string",
                        @default = ApiKeyConfiguration.Instance.ApiKey,
                    });
                }
            }
        }
    }
}