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using System;
using System.Text;
using System.Net;
using System.Net.Json;


namespace Google
{
    #region TranslateLanguages
    public enum TranslateLanguages
    {
        Russian,
        English,
        German,
        French,
        Italian,
        Ukrainian
    }
    #endregion

    public static class GoogleTranslate
    {
        #region Const
        static readonly Encoding defEncoding = Encoding.UTF8;

        static readonly string langRus = "ru";
        static readonly string langEng = "en";
        static readonly string langGerman = "de";
        static readonly string langFrench = "fr";
        static readonly string langItalian = "it";
        static readonly string langUkrain = "uk";

        static readonly string gApiJTranslationVarName = "translatedText";
        #endregion
        #region Helpers
        static string GetLanguageString(TranslateLanguages Language)
        {
            switch (Language)
            {
                case TranslateLanguages.English:
                    return langEng;
                case TranslateLanguages.Russian:
                    return langRus;
                case TranslateLanguages.German:
                    return langGerman;
                case TranslateLanguages.French:
                    return langFrench;
                case TranslateLanguages.Italian:
                    return langItalian;
                case TranslateLanguages.Ukrainian:
                    return langUkrain;
                default:
                    throw new ArgumentException("Language not supported");
            }
        }

        static string GetURL(string Txt, TranslateLanguages L1, TranslateLanguages L2)
        {
            var languagePair = 
                string.Format(
                    "{0}|{1}", 
                    GetLanguageString(L1), 
                    GetLanguageString(L2));

            return String.Format("http://ajax.googleapis.com/ajax/services/language/translate?v=1.0&q={0}&langpair={1}", Txt, languagePair);
        }

        static JsonObject GetJsonObject(string JsonText)
        {
            return new JsonTextParser().Parse(JsonText);
        }

        static void GetJsonValue(JsonObjectCollection JOCollection, string VarName, ref JsonObject JObject)
        {
            foreach (var e in JOCollection)
            {
                if (e.GetType() == typeof(JsonObjectCollection))
                    GetJsonValue(e as JsonObjectCollection, VarName, ref JObject);
                else if (e.Name.Equals(VarName))
                    JObject = e;
            }
        }
        #endregion
        #region Public
        /// <summary>
        /// Google Translate
        /// </summary>
        /// <param name="inText">Input text</param>
        /// <param name="inLang">Input text language</param>
        /// <param name="outLang">Output language</param>
        /// <returns>Translated text</returns>
        public static string Translate(string inText, TranslateLanguages inLang, TranslateLanguages outLang)
        {
            if (
                string.IsNullOrEmpty(inText) ||
                inLang == null ||
                outLang == null ||
                inLang.Equals(outLang)
                )
                throw new ArgumentException("Invalid agruments");

            var response = string.Empty;

            using (var wc = new WebClient())
            {
                wc.Encoding = defEncoding;
                // JSON: {"responseData": {"translatedText":"ciao a tutti"}, "responseDetails": null, "responseStatus": 200}
                response = wc.DownloadString(GetURL(inText, inLang, outLang));
            }

            var translationText = new object() as JsonObject;

            GetJsonValue(
                GetJsonObject(response) as JsonObjectCollection,
                gApiJTranslationVarName,
                ref translationText);

            return translationText.GetValue().ToString();
        }
        #endregion
    }
}