using System;
using System.Net;
using System.Threading;
using System.Threading.Tasks;
using System.Web;
using ServiceStack.Logging;
using ServiceStack.Web;
using ServiceStack.Text;

namespace ServiceStack;

public static class HttpExtensions
{
    public static string ToAbsoluteUri(this IReturn requestDto, string httpMethod = null, string formatFallbackToPredefinedRoute = null)
    {
        var relativeUrl = requestDto.ToUrl(
            httpMethod ?? HttpMethods.Get,
            formatFallbackToPredefinedRoute ?? HostContext.Config.DefaultContentType.ToContentFormat());

        return relativeUrl.ToAbsoluteUri();
    }

    public static string ToAbsoluteUri(this object requestDto, string httpMethod = null, string formatFallbackToPredefinedRoute = null)
    {
        var relativeUrl = requestDto.ToUrl(
            httpMethod ?? HttpMethods.Get,
            formatFallbackToPredefinedRoute ?? HostContext.Config.DefaultContentType.ToContentFormat());

        return relativeUrl.ToAbsoluteUri();
    }

    public static string ToAbsoluteUri(this object requestDto, IRequest req, string httpMethod = null, string formatFallbackToPredefinedRoute = null)
    {
        var relativeUrl = requestDto.ToUrl(
            httpMethod ?? HttpMethods.Get,
            formatFallbackToPredefinedRoute ?? HostContext.Config.DefaultContentType.ToContentFormat());

        return relativeUrl.ToAbsoluteUri(req);
    }

    public static string ToAbsoluteUri(this string relativeUrl, IRequest req = null)
    {
        if (req == null)
            req = HostContext.TryGetCurrentRequest();

        var absoluteUrl = HostContext.ResolveAbsoluteUrl("~/".CombineWith(relativeUrl), req);
        return absoluteUrl;
    }

    /// <summary>
    /// End a ServiceStack Request
    /// </summary>
    public static void EndRequest(this IResponse httpRes, bool skipHeaders = false)
    {
        httpRes.EndHttpHandlerRequest(skipHeaders: skipHeaders);
    }

    public static Task EndRequestAsync(this IResponse httpRes, bool skipHeaders = false, Func<IResponse,Task> afterHeaders = null)
    {
        return httpRes.EndHttpHandlerRequestAsync(skipHeaders: skipHeaders, afterHeaders:afterHeaders);
    }
        
#if !NETCORE
        /// <summary>
        /// End a ServiceStack Request
        /// </summary>
        public static void EndRequest(this HttpResponseBase httpRes, bool skipHeaders = false)
        {
            if (!skipHeaders) httpRes.ApplyGlobalResponseHeaders();
            httpRes.Close();
            HostContext.CompleteRequest(null);
        }

        /// <summary>
        /// End a HttpHandler Request
        /// </summary>
        public static void EndHttpHandlerRequest(this HttpContextBase context, bool skipHeaders = false, bool skipClose = false, bool closeOutputStream = false, Action<HttpResponseBase> afterHeaders = null)
        {
            var httpRes = context.Response;
            if (!skipHeaders) httpRes.ApplyGlobalResponseHeaders();
            afterHeaders?.Invoke(httpRes);
            if (closeOutputStream) httpRes.CloseOutputStream();
            else if (!skipClose) httpRes.Close();
            HostContext.CompleteRequest(context.ToRequest());

            //skipHeaders used when Apache+mod_mono doesn't like:
            //response.OutputStream.Flush();
            //response.Close();
        }
#endif

    /// <summary>
    /// End a HttpHandler Request
    /// </summary>
    public static void EndHttpHandlerRequest(this IResponse httpRes, bool skipHeaders = false, bool skipClose = false, Action<IResponse> afterHeaders = null)
    {
        if (!skipHeaders) httpRes.ApplyGlobalResponseHeaders();

        afterHeaders?.Invoke(httpRes);

        var req = httpRes.Request;
        if (req != null && !req.Items.ContainsKey(Keywords.HasLogged))
        {
            HostContext.AppHost.OnLogRequest(req, req.Dto, httpRes.Dto, req.GetElapsed());
        }

        if (!skipClose && !httpRes.IsClosed) 
            httpRes.Close();

        HostContext.CompleteRequest(req);
    }

    public static async Task EndHttpHandlerRequestAsync(this IResponse httpRes, bool skipHeaders = false, bool skipClose = false, Func<IResponse,Task> afterHeaders = null)
    {
        if (!skipHeaders) httpRes.ApplyGlobalResponseHeaders();

        if (afterHeaders != null)
        {
            try
            {
                await afterHeaders(httpRes).ConfigAwait();
            }
            catch (Exception e)
            {
                var log = LogManager.LogFactory.GetLogger(typeof(HttpExtensions));
                log.Error("Error executing async afterHeaders: " + e.Message, e);
            }
        }

        var req = httpRes.Request;
        if (req != null && !req.Items.ContainsKey(Keywords.HasLogged))
        {
            HostContext.AppHost.OnLogRequest(req, req.Dto, httpRes.Dto, req.GetElapsed());
        }

        if (!skipClose && !httpRes.IsClosed)
        {
            await httpRes.CloseAsync().ConfigAwait();
        }

        HostContext.CompleteRequest(req);
    }

    /// <summary>
    /// End an MQ Request
    /// </summary>
    public static void EndMqRequest(this IResponse httpRes, bool skipClose = false)
    {
        if (!skipClose && !httpRes.IsClosed) httpRes.Close();
        HostContext.CompleteRequest(httpRes.Request);
    }

    /// <summary>
    /// End a ServiceStack Request with no content
    /// </summary>
    public static void EndRequestWithNoContent(this IResponse httpRes)
    {
        var headOrOptions = httpRes.Request.Verb is HttpMethods.Head or HttpMethods.Options;
        if (!headOrOptions && !httpRes.HasStarted)
        {
            if (HostContext.Config == null || HostContext.Config.Return204NoContentForEmptyResponse)
            {
                if (httpRes.StatusCode == (int)HttpStatusCode.OK)
                {
                    httpRes.StatusCode = (int)HttpStatusCode.NoContent;
                }
            }

            httpRes.SetContentLength(0);
        }
            
        httpRes.EndRequest();
    }
}