using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;

namespace ln.http
{
    public class HttpResponse
    {
        public HttpRequest HttpRequest { get; }

        public Stream ContentStream { get; private set; }
        public TextWriter ContentWriter { get; private set; }
        public bool HasCustomContentStream { get; private set; }

        int statusCode;
        string statusMessage;
        Dictionary<string, List<String>> headers = new Dictionary<string, List<string>>();
        List<HttpCookie> cookies = new List<HttpCookie>();

        public HttpResponse(HttpRequest httpRequest)
        {
            HttpRequest = httpRequest;
            ContentStream = new MemoryStream();
            ContentWriter = new StreamWriter(ContentStream);

            StatusCode = 200; 
            SetHeader("content-type", "text/html");
        }
        public HttpResponse(HttpRequest httpRequest,string contentType)
            :this(httpRequest)
        {
            SetHeader("content-type", contentType);
        }

        public HttpResponse(HttpRequest httpRequest, Stream contentStream)
        {
            HttpRequest = httpRequest;
            ContentStream = contentStream;
            ContentWriter = null;
            HasCustomContentStream = true;

            StatusCode = 200;
            SetHeader("content-type", "text/html");
        }
        public HttpResponse(HttpRequest httpRequest, Stream contentStream,string contentType)
            :this(httpRequest,contentStream)
        {
            SetHeader("content-type", contentType);
        }

        public String GetHeader(string name) => GetHeader(name, null);
        public String GetHeader(string name, string defValue)
        {
            return headers.ContainsKey(name) ? String.Join(",", headers[name.ToUpper()]) : defValue;
        }

        public String[] GetHeaderValues(string name)
        {
            return headers[name.ToUpper()].ToArray();
        }
        public String[] GetHeaderNames()
        {
            return headers.Keys.ToArray();
        }

        public void SetHeader(String name, String value)
        {
            name = name.ToUpper();

            headers[name] = new List<string>();
            headers[name].Add(value);
        }
        public void AddHeader(String name, String value)
        {
            name = name.ToUpper();

            if (!headers.ContainsKey(name))
                headers[name] = new List<string>();

            headers[name].Add(value);
        }
        public void RemoveHeader(String name)
        {
            headers.Remove(name.ToUpper());
        }

        public bool ContainsHeader(string headerName)
        {
            return headers.ContainsKey(headerName.ToUpper());
        }

        public void AddCookie(string name,string value)
        {
            AddCookie(new HttpCookie(name, value));
        }
        public void AddCookie(HttpCookie httpCookie)
        {
            cookies.Add(httpCookie);
        }
        public void RemoveCookie(HttpCookie httpCookie)
        {
            cookies.Remove(httpCookie);
        }
        public HttpCookie[] Cookies => cookies.ToArray();



        public int StatusCode
        {
            get
            {
                return statusCode;
            }
            set {
                statusCode = value;
                statusMessage = HttpStatusCodes.GetStatusMessage(statusCode);
            }
        }
        public String StatusMessage
        {
            get {
                return statusMessage;
            }
            set {
                statusMessage = value;
            }
        }





    }
}