using System;
using System.IO;
using System.Net;
using System.Text;
using System.Security.Cryptography;
using System.Collections.Generic;

namespace com.rwmanila
{
    public class api
    {
        private const string AuthenticationHeaderName = "Authentication";
        private const string TimestampHeaderName = "Timestamp";
        private const string RandomHeaderName = "Random";

        internal const string serverUrl = "https://phoenix.newportworldresorts.com/api";
        internal const string publicUserId = "public";
        internal const string publicAPIKey = "7CE766FE1473813B97C148EB9F7BD49514B9ECD0";

        public string userId { get; internal set; }
        public string apiKey { get; internal set; }
        public Uri server { get; internal set; }

        public api(string userId = api.publicUserId,
            string apiKey = api.publicAPIKey,
            string server = api.serverUrl)
        {
            this.userId = userId;
            this.apiKey = apiKey;
            this.server = new Uri(server);
        }
        public string send(string request, string contentType)
        {
            string r = string.Empty;
            string g = Guid.NewGuid().ToString("D");
            string t = DateTime.Now.ToString("U");

            try
            {
                HttpWebRequest req = (HttpWebRequest)
                    WebRequest.Create(this.server);
                req.Method = "POST";
                req.ContentType = contentType;
                req.Headers.Add(api.TimestampHeaderName, t);
                req.Headers.Add(api.AuthenticationHeaderName,
                    this.userId + ":" +
                    api.genSignature(this.apiKey,
                        string.Join(" ", req.Method, t, g, this.server.AbsolutePath).Trim()));
                req.Headers.Add(api.RandomHeaderName, g);
                byte[] postData = Encoding.UTF8.GetBytes(request);
                req.ContentLength = postData.Length;
                using (Stream sreq = req.GetRequestStream())
                    sreq.Write(postData, 0, postData.Length);
                using (Stream sres = req.GetResponse().GetResponseStream())
                using (StreamReader sread = new StreamReader(sres))
                    r = sread.ReadToEnd();
            }
            catch (Exception ex) { r = ex.Message; }
            return r;
        }
        public string sendJSON(string commandGroup, string command, Dictionary<string, string> parameters)
        {
            StringBuilder json = new StringBuilder();
            json.AppendLine("{");
            json.Append("   cgrp:'");
            json.Append(commandGroup);
            json.AppendLine("',");
            json.Append("   cmnd:'");
            json.Append(command);
            json.AppendLine("',");
            json.AppendLine("   prms:{");
            foreach (KeyValuePair<string, string> item in parameters)
            {
                json.Append("       '");
                json.Append(item.Key);
                json.Append("':'");
                json.Append(item.Value);
                json.AppendLine("',");
            }
            json.AppendLine("   }");
            json.AppendLine("}");
            return this.send(json.ToString(), "application/json");
        }
        private static string genSignature(string apikey, string message)
        {
            var key = Encoding.UTF8.GetBytes(apikey.ToUpper());
            string hashString;

            using (var hmac = new HMACSHA256(key))
            {
                var hash = hmac.ComputeHash(Encoding.UTF8.GetBytes(message.Trim()));
                hashString = Convert.ToBase64String(hash);
            }

            return hashString;
        }
    }
}