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using System;

using System.Collections.Generic;

using System.Threading.Tasks;

using uhttpsharp.Controllers;

namespace uhttpsharp.Handlers

{

public interface IControllerResponse

{

Task<IHttpResponse> Respond(IHttpContext context, IView view);

}

public class CustomResponse : IControllerResponse

{

private readonly IHttpResponse _httpResponse;

public CustomResponse(IHttpResponse httpResponse)

{

_httpResponse = httpResponse;

}

public Task<IHttpResponse> Respond(IHttpContext context, IView view)

{

return Task.FromResult(_httpResponse);

}

}

public class RenderResponse : IControllerResponse

{

private readonly HttpResponseCode _code;

private readonly object _state;

public RenderResponse(HttpResponseCode code, object state)

{

_code = code;

_state = state;

}

public object State

{

get { return _state; }

}

public HttpResponseCode Code

{

get { return _code; }

}

public async Task<IHttpResponse> Respond(IHttpContext context, IView view)

{

var output = await view.Render(context, _state).ConfigureAwait(false);

return StringHttpResponse.Create(output.Body, _code, output.ContentType);

}

}

public class RedirectResponse : IControllerResponse

{

private readonly Uri _newLocation;

public RedirectResponse(Uri newLocation)

{

_newLocation = newLocation;

}

public Task<IHttpResponse> Respond(IHttpContext context, IView view)

{

var headers =

new[]

{

new KeyValuePair<string, string>("Location", _newLocation.ToString())

};

return Task.FromResult<IHttpResponse>(

new HttpResponse(HttpResponseCode.Found, String.Empty, headers,false));

}

}

public static class Response

{

public static Task<IControllerResponse> Create(IControllerResponse response)

{

return Task.FromResult(response);

}

public static Task<IControllerResponse> Custom(IHttpResponse httpResponse)

{

return Create(new CustomResponse(httpResponse));

}

public static Task<IControllerResponse> Render(HttpResponseCode code, object state)

{

return Create(new RenderResponse(code, state));

}

public static Task<IControllerResponse> Render(HttpResponseCode code)

{

return Create(new RenderResponse(code, null));

}

public static Task<IControllerResponse> Redirect(Uri newLocation)

{

return Create(new RedirectResponse(newLocation));

}

}

public static class Pipeline

{

private class EmptyPipeline : IPipeline

{

public Task<IControllerResponse> Go(Func<Task<IControllerResponse>> injectedTask, IHttpContext context)

{

return injectedTask();

}

}

public static IPipeline Empty = new EmptyPipeline();

}

}