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.Ellenorzo.Dto.VN.Attributes;
using Kreta.Ellenorzo.WebApi;
using Swashbuckle.Application;
using Swashbuckle.Examples;
using Swashbuckle.Swagger;
using WebActivatorEx;

[assembly: PreApplicationStartMethod(typeof(SwaggerConfig), nameof(SwaggerConfig.Register))]

namespace Kreta.Ellenorzo.WebApi
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1053:StaticHolderTypesShouldNotHaveConstructors")]
    public class SwaggerConfig
    {
        private const string HeaderString = "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"]))
            {
                GlobalConfiguration.Configuration
                    .EnableSwagger(c =>
                        {
                            c.MultipleApiVersions(
                                (apiDesc, targetApiVersion) => ResolveVersionSupportByRouteConstraint(apiDesc, targetApiVersion),
                                    (vc) =>
                                    {
                                        _ = vc.Version(VN.Constants.RoutePrefix, $"Kreta.Ellenorzo.WebApi {VN.Constants.RoutePrefix}");
                                    }
                                );

                            c.IncludeXmlComments($"{AppDomain.CurrentDomain.BaseDirectory}\\App_Data\\Kreta.Ellenorzo.Web.XML");
                            c.IncludeXmlComments($"{AppDomain.CurrentDomain.BaseDirectory}\\App_Data\\Kreta.Ellenorzo.Dto.xml");
                            c.OperationFilter<ExamplesOperationFilter>();
                            c.OperationFilter<DescriptionOperationFilter>();
                            c.UseFullTypeNameInSchemaIds();

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

                            c.OperationFilter<AddAuthorizationHeaderParameter>();
                            c.SchemaFilter<SwaggerChangeTypeFilter>();
                            c.RootUrl(ResolveBasePath);
                        })
                    .EnableSwaggerUi(c =>
                        {
                            c.DocExpansion(DocExpansion.List);
                            c.EnableApiKeySupport("Authorization", HeaderString);
                        });
            }
        }

        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 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;
        }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses")]
        private sealed class AddAuthorizationHeaderParameter : IOperationFilter
        {
            [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "0")]
            public void Apply(Operation operation, SchemaRegistry schemaRegistry, ApiDescription apiDescription)
            {
                operation.parameters = operation.parameters ?? new List<Parameter>();

                operation.parameters.Add(new Parameter
                {
                    name = "Authorization",
                    @in = HeaderString,
                    description = "access token",
                    required = false,
                    type = "string"
                });

                if (ApiKeyConfiguration.Instance.Enabled)
                {
                    operation.parameters.Add(new Parameter
                    {
                        name = "ApiKey",
                        @in = HeaderString,
                        description = "api key",
                        required = false,
                        type = "string",
                        @default = ApiKeyConfiguration.Instance.ApiKey
                    });
                }
            }
        }
    }
}