using System;
using System.Collections.Generic;
using System.IO;
using Zhaizj.Framework.Web;

namespace Zhaizj.Framework {

    /// <summary>
    /// 语言包工具，用于加载多国语言。
    /// </summary>
    /// <remarks>
    /// 默认语言包文件存放在 /framework/lang/ 中，比如 /framework/lang/zh-cn/ 。只要在 /framework/lang/  中新增一个语言包文件夹，则系统将其作为语言包列表自动加载。可添加的语言包名称包括：en-us,en-gb,zh-cn,zh-tw,ja,ko,fr,de,it
    /// </remarks>
    public class lang {

        // 这个一定要放在第一行，以保证第一个加载
        private static Dictionary<String, Dictionary<String, LanguageSetting>> langLocaleAll = getLangLocale();

        //--------------------------------------------------------------------

        /// <summary>
        /// 获取当前语言字符(比如 zh-cn，或 en-us)
        /// </summary>
        /// <returns></returns>
        public static String getLangString() {

            String defaultLang = "zh-cn";

            String langCookie = CurrentRequest.getLangCookie();
            if (strUtil.HasText( langCookie ) && langLocaleAll.ContainsKey( langCookie )) return langCookie;

            if (CurrentRequest.getUserLanguages() == null) return defaultLang;
            String[] reqLangs = CurrentRequest.getUserLanguages();
            if (reqLangs.Length == 0) return defaultLang;
            if (langLocaleAll.ContainsKey( reqLangs[0] )) return reqLangs[0];

            return defaultLang;
        }

        /// <summary>
        /// 获取某 key 的语言值
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static String get( String key ) {
            try {
                String langStr = getLangString();
                return getCoreLang( langStr ).getLangMap() [key];

            }
            catch (KeyNotFoundException) {
                throw new KeyNotFoundException( "language's key not found: " + key );
            }
        }

        /// <summary>
        /// 获取在 core.config 中定义的核心语言包
        /// </summary>
        /// <returns></returns>
        public static LanguageSetting getCoreLang() {
            return getCoreLang( getLangString() );
        }

        private static LanguageSetting getCoreLang( String langStr ) {
            Dictionary<String, LanguageSetting> langlist = langLocaleAll[langStr];
            return langlist["core"];
        }

        /// <summary>
        /// 根据类型 t 获取语言列表
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public static LanguageSetting getByApp( Type t ) {

            Dictionary<String, LanguageSetting> langlist = langLocaleAll[getLangString()];
            LanguageSetting result;
            langlist.TryGetValue( t.FullName, out result );
            return result;

        }

        //--------------------------------------------------------------------

        private static Dictionary<String, Dictionary<String, LanguageSetting>> getLangLocale() {

            String dirRoot = PathHelper.Map( getLangRootPath() );

            String[] dirPaths = Directory.GetDirectories( dirRoot );

            Dictionary<String, Dictionary<String, LanguageSetting>> results = new Dictionary<String, Dictionary<String, LanguageSetting>>();
            foreach (String path in dirPaths) {
                String langName = Path.GetFileName( path );
                results.Add( langName.ToLower(), getLangList( path ) );
            }

            return results;
        }

        private static Dictionary<String, LanguageSetting> getLangList( String path ) {

            String[] files = Directory.GetFiles( path );

            Dictionary<String, LanguageSetting> results = new Dictionary<String, LanguageSetting>();

            foreach (String file in files) {

                if (Path.GetExtension( file ) != ".config") continue;

                String fileName = Path.GetFileNameWithoutExtension( file );

                Dictionary<String, String> _lang = cfgHelper.Read( file, '=' );
                LanguageSetting lbl = new LanguageSetting( fileName, _lang );

                results.Add( fileName, lbl );
            }

            return results;
        }

        //--------------------------------------------------------------------

        private static String getLangRootPath() {
            return cfgHelper.FrameworkRoot + "lang/";
        }

        //------------------------------------------------------------------

        /// <summary>
        /// 获取所有支持的语言包
        /// </summary>
        /// <returns></returns>
        public static List<Dictionary<String, String>> GetSupportedLang() {

            List<Dictionary<String, String>> list = new List<Dictionary<String, String>>();
            foreach (String key in langLocaleAll.Keys) {
                Dictionary<String, String> pair = new Dictionary<String, String>();
                pair.Add( "Name", GetLangInfo( key ) );
                pair.Add( "Value", key );
                list.Add( pair );
            }
            return list;
        }

        private static String GetLangInfo( String langStr ) {
            if (langMap.ContainsKey( langStr )) return langMap[langStr];
            return langStr;
        }

        private static Dictionary<String, String> langMap = getLangInfo();

        private static Dictionary<String, String> getLangInfo() {
            Dictionary<String, String> map = new Dictionary<String, String>();
            map.Add( "en-us", "English (US)" );
            map.Add( "en-gb", "English (British)" );
            map.Add( "zh-cn", "中文(简体)" ); // skipLang
            map.Add( "zh-tw", "正體中文(繁體)" ); // skipLang
            map.Add( "ja", "日本語" );// skipLang
            map.Add( "ko", "한국어" );
            map.Add( "fr", "Français" );
            map.Add( "de", "Deutsch" );
            map.Add( "it", "Italiano" );

            return map;
        }

    }



}