// --------------------------------------------------------------------------------------------------------------------
// <copyright file="LanguageUtilities.cs" company="HandBrake Project (http://handbrake.fr)">
//   This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
// </copyright>
// <summary>
//   Language Utilities
// </summary>
// --------------------------------------------------------------------------------------------------------------------

namespace HandBrake.ApplicationServices.Utilities
{
    using System.Collections.Generic;
    using System.Collections.Specialized;
    using System.Linq;

    /// <summary>
    /// Language Utilities
    /// </summary>
    public class LanguageUtilities
    {
        /// <summary>
        /// The language map.
        /// </summary>
        private static IDictionary<string, string> languageMap;

        /// <summary>
        /// Map languages and their iso639_2 value into a IDictionary
        /// </summary>
        /// <returns>A Dictionary containing the language and iso code</returns>
        public static IDictionary<string, string> MapLanguages()
        {
            if (languageMap != null)
            {
                return languageMap;
            }

            languageMap = new Dictionary<string, string>
                                                          {
                                                              {"(Any)", "und"}, 
                                                              {"Afar", "aar"}, 
                                                              {"Abkhazian", "abk"}, 
                                                              {"Afrikaans", "afr"}, 
                                                              {"Akan", "aka"}, 
                                                              {"Albanian", "sqi"}, 
                                                              {"Amharic", "amh"}, 
                                                              {"Arabic", "ara"}, 
                                                              {"Aragonese", "arg"}, 
                                                              {"Armenian", "hye"}, 
                                                              {"Assamese", "asm"}, 
                                                              {"Avaric", "ava"}, 
                                                              {"Avestan", "ave"}, 
                                                              {"Aymara", "aym"}, 
                                                              {"Azerbaijani", "aze"}, 
                                                              {"Bashkir", "bak"}, 
                                                              {"Bambara", "bam"}, 
                                                              {"Basque", "eus"}, 
                                                              {"Belarusian", "bel"}, 
                                                              {"Bengali", "ben"}, 
                                                              {"Bihari", "bih"}, 
                                                              {"Bislama", "bis"}, 
                                                              {"Bosnian", "bos"}, 
                                                              {"Breton", "bre"}, 
                                                              {"Bulgarian", "bul"}, 
                                                              {"Burmese", "mya"}, 
                                                              {"Catalan", "cat"}, 
                                                              {"Chamorro", "cha"}, 
                                                              {"Chechen", "che"}, 
                                                              {"Chinese", "zho"}, 
                                                              {"Church Slavic", "chu"}, 
                                                              {"Chuvash", "chv"}, 
                                                              {"Cornish", "cor"}, 
                                                              {"Corsican", "cos"}, 
                                                              {"Cree", "cre"}, 
                                                              {"Czech", "ces"}, 
                                                              {"Dansk", "dan"}, 
                                                              {"Divehi", "div"}, 
                                                              {"Nederlands", "nld"}, 
                                                              {"Dzongkha", "dzo"}, 
                                                              {"English", "eng"}, 
                                                              {"Esperanto", "epo"}, 
                                                              {"Estonian", "est"}, 
                                                              {"Ewe", "ewe"}, 
                                                              {"Faroese", "fao"}, 
                                                              {"Fijian", "fij"}, 
                                                              {"Suomi", "fin"}, 
                                                              {"Francais", "fra"}, 
                                                              {"Western Frisian", "fry"}, 
                                                              {"Fulah", "ful"}, 
                                                              {"Georgian", "kat"}, 
                                                              {"Deutsch", "deu"}, 
                                                              {"Gaelic (Scots)", "gla"}, 
                                                              {"Irish", "gle"}, 
                                                              {"Galician", "glg"}, 
                                                              {"Manx", "glv"}, 
                                                              {"Greek, Modern", "ell"}, 
                                                              {"Guarani", "grn"}, 
                                                              {"Gujarati", "guj"}, 
                                                              {"Haitian", "hat"}, 
                                                              {"Hausa", "hau"}, 
                                                              {"Hebrew", "heb"}, 
                                                              {"Herero", "her"}, 
                                                              {"Hindi", "hin"}, 
                                                              {"Hiri Motu", "hmo"}, 
                                                              {"Magyar", "hun"}, 
                                                              {"Igbo", "ibo"}, 
                                                              {"Islenska", "isl"}, 
                                                              {"Ido", "ido"}, 
                                                              {"Sichuan Yi", "iii"}, 
                                                              {"Inuktitut", "iku"}, 
                                                              {"Interlingue", "ile"}, 
                                                              {"Interlingua", "ina"}, 
                                                              {"Indonesian", "ind"}, 
                                                              {"Inupiaq", "ipk"}, 
                                                              {"Italiano", "ita"}, 
                                                              {"Javanese", "jav"}, 
                                                              {"Japanese", "jpn"}, 
                                                              {"Kalaallisut", "kal"}, 
                                                              {"Kannada", "kan"}, 
                                                              {"Kashmiri", "kas"}, 
                                                              {"Kanuri", "kau"}, 
                                                              {"Kazakh", "kaz"}, 
                                                              {"Central Khmer", "khm"}, 
                                                              {"Kikuyu", "kik"}, 
                                                              {"Kinyarwanda", "kin"}, 
                                                              {"Kirghiz", "kir"}, 
                                                              {"Komi", "kom"}, 
                                                              {"Kongo", "kon"}, 
                                                              {"Korean", "kor"}, 
                                                              {"Kuanyama", "kua"}, 
                                                              {"Kurdish", "kur"}, 
                                                              {"Lao", "lao"}, 
                                                              {"Latin", "lat"}, 
                                                              {"Latvian", "lav"}, 
                                                              {"Limburgan", "lim"}, 
                                                              {"Lingala", "lin"}, 
                                                              {"Lithuanian", "lit"}, 
                                                              {"Luxembourgish", "ltz"}, 
                                                              {"Luba-Katanga", "lub"}, 
                                                              {"Ganda", "lug"}, 
                                                              {"Macedonian", "mkd"}, 
                                                              {"Marshallese", "mah"}, 
                                                              {"Malayalam", "mal"}, 
                                                              {"Maori", "mri"}, 
                                                              {"Marathi", "mar"}, 
                                                              {"Malay", "msa"}, 
                                                              {"Malagasy", "mlg"}, 
                                                              {"Maltese", "mlt"}, 
                                                              {"Moldavian", "mol"}, 
                                                              {"Mongolian", "mon"}, 
                                                              {"Nauru", "nau"}, 
                                                              {"Navajo", "nav"}, 
                                                              {"Ndebele, South", "nbl"}, 
                                                              {"Ndebele, North", "nde"}, 
                                                              {"Ndonga", "ndo"}, 
                                                              {"Nepali", "nep"}, 
                                                              {"Norwegian Nynorsk", "nno"}, 
                                                              {"Norwegian Bokmål", "nob"}, 
                                                              {"Norsk", "nor"}, 
                                                              {"Chichewa; Nyanja", "nya"}, 
                                                              {"Occitan", "oci"}, 
                                                              {"Ojibwa", "oji"}, 
                                                              {"Oriya", "ori"}, 
                                                              {"Oromo", "orm"}, 
                                                              {"Ossetian", "oss"}, 
                                                              {"Panjabi", "pan"}, 
                                                              {"Persian", "fas"}, 
                                                              {"Pali", "pli"}, 
                                                              {"Polish", "pol"}, 
                                                              {"Portuguese", "por"}, 
                                                              {"Pushto", "pus"}, 
                                                              {"Quechua", "que"}, 
                                                              {"Romansh", "roh"}, 
                                                              {"Romanian", "ron"}, 
                                                              {"Rundi", "run"}, 
                                                              {"Russian", "rus"}, 
                                                              {"Sango", "sag"}, 
                                                              {"Sanskrit", "san"}, 
                                                              {"Serbian", "srp"}, 
                                                              {"Hrvatski", "hrv"}, 
                                                              {"Sinhala", "sin"}, 
                                                              {"Slovak", "slk"}, 
                                                              {"Slovenian", "slv"}, 
                                                              {"Northern Sami", "sme"}, 
                                                              {"Samoan", "smo"}, 
                                                              {"Shona", "sna"}, 
                                                              {"Sindhi", "snd"}, 
                                                              {"Somali", "som"}, 
                                                              {"Sotho Southern", "sot"}, 
                                                              {"Espanol", "spa"}, 
                                                              {"Sardinian", "srd"}, 
                                                              {"Swati", "ssw"}, 
                                                              {"Sundanese", "sun"}, 
                                                              {"Swahili", "swa"}, 
                                                              {"Svenska", "swe"}, 
                                                              {"Tahitian", "tah"}, 
                                                              {"Tamil", "tam"}, 
                                                              {"Tatar", "tat"}, 
                                                              {"Telugu", "tel"}, 
                                                              {"Tajik", "tgk"}, 
                                                              {"Tagalog", "tgl"}, 
                                                              {"Thai", "tha"}, 
                                                              {"Tibetan", "bod"}, 
                                                              {"Tigrinya", "tir"}, 
                                                              {"Tonga", "ton"}, 
                                                              {"Tswana", "tsn"}, 
                                                              {"Tsonga", "tso"}, 
                                                              {"Turkmen", "tuk"}, 
                                                              {"Turkish", "tur"}, 
                                                              {"Twi", "twi"}, 
                                                              {"Uighur", "uig"}, 
                                                              {"Ukrainian", "ukr"}, 
                                                              {"Urdu", "urd"}, 
                                                              {"Uzbek", "uzb"}, 
                                                              {"Venda", "ven"}, 
                                                              {"Vietnamese", "vie"}, 
                                                              {"Volapük", "vol"}, 
                                                              {"Welsh", "cym"}, 
                                                              {"Walloon", "wln"}, 
                                                              {"Wolof", "wol"}, 
                                                              {"Xhosa", "xho"}, 
                                                              {"Yiddish", "yid"}, 
                                                              {"Yoruba", "yor"}, 
                                                              {"Zhuang", "zha"}, 
                                                              {"Zulu", "zul"}
                                                          };
            return languageMap;
        }

        /// <summary>
        /// The get language codes.
        /// </summary>
        /// <param name="userLanguages">
        /// The user languages.
        /// </param>
        /// <returns>
        /// The <see cref="IList"/>.
        /// </returns>
        public static List<string> GetLanguageCodes(StringCollection userLanguages)
        {
            // Translate to Iso Codes
            List<string> iso6392Codes = new List<string>();
            foreach (var item in userLanguages)
            {
                string isoCode;
                if (LanguageUtilities.MapLanguages().TryGetValue(item, out isoCode))
                {
                    iso6392Codes.Add(isoCode);
                }
            }

            return iso6392Codes;
        }

        /// <summary>
        /// The get language codes.
        /// </summary>
        /// <param name="userLanguages">
        /// The user languages.
        /// </param>
        /// <returns>
        /// The <see cref="List"/>.
        /// </returns>
        public static List<string> GetLanguageCodes(IList<string> userLanguages)
        {
            // Translate to Iso Codes
            List<string> iso6392Codes = new List<string>();
            foreach (var item in userLanguages)
            {
                string isoCode;
                if (LanguageUtilities.MapLanguages().TryGetValue(item, out isoCode))
                {
                    iso6392Codes.Add(isoCode);
                }
            }

            return iso6392Codes;
        }

        /// <summary>
        /// The get iso codes.
        /// </summary>
        /// <returns>
        /// The <see cref="List"/>.
        /// </returns>
        public static List<string> GetIsoCodes()
        {
           return MapLanguages().Values.ToList();
        }
    }
}