From 13d9a5e551c6f6f00ad5d8556a5352c118ad6a3e Mon Sep 17 00:00:00 2001
From: Michael Hoffmeister <michael.hoffmeister@festo.com>
Date: Tue, 3 Sep 2024 17:35:37 +0200
Subject: [PATCH] * prepare refacture of    language defaults

---
 src/AasxIntegrationBase/AasxLanguageHelper.cs | 120 ++++++++++++++++++
 1 file changed, 120 insertions(+)

diff --git a/src/AasxIntegrationBase/AasxLanguageHelper.cs b/src/AasxIntegrationBase/AasxLanguageHelper.cs
index d1c1ac72..a2d4a0b0 100644
--- a/src/AasxIntegrationBase/AasxLanguageHelper.cs
+++ b/src/AasxIntegrationBase/AasxLanguageHelper.cs
@@ -7,16 +7,136 @@ This source code is licensed under the Apache License 2.0 (see LICENSE.txt).
 This source code may use other Open Source software components (see LICENSE.txt).
 */
 
+using AdminShellNS;
 using System;
 using System.Collections.Generic;
+using System.Collections.Immutable;
 using System.Linq;
 using System.Text;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 
 namespace AasxIntegrationBase
 {
+    /// <summary>
+    /// This class lists valid combinations of  ISO 639 (2 digit language codes)
+    /// and ISO 3166 (2 digit country codes). Only 1:1 relations are modelled.
+    /// </summary>
+    public class AasxLanguageTuple
+    {
+        /// <summary>
+        /// According ISO 639-2, 2 digit language code
+        /// </summary>
+        public string LangCode;
+
+        /// <summary>
+        /// According ISO 3166, 2 digit country code
+        /// </summary>
+        public string CountryCode;
+
+        /// <summary>
+        /// Marks the wildcard element
+        /// </summary>
+        public bool IsAny()
+        {
+            return LangCode == "" && CountryCode == ""
+                || LangCode == "All" && CountryCode == "All";
+        }
+    }
+
+    /// <summary>
+    /// Maintains a list of language tuples.
+    /// Note: Is always defaulted with a list of language tuples. 
+    /// Could be cleard/ added.
+    /// </summary>
+    public class AasxLanguageTupleSet : MultiValueDictionary<string, AasxLanguageTuple>
+    {
+        public void Add(string lang, string country)
+        {
+            lang = lang?.ToLower().Trim();
+            country = country?.ToLower().Trim();
+
+            if (lang != null && lang != "" 
+                && country != null && country != "")
+            {
+                this.Add(lang, new AasxLanguageTuple() { LangCode = lang, CountryCode = country });
+            }
+        }
+
+        /// <summary>
+        /// Rationale for default languages/ countries: member in IDTA or IEC TC65 WG24
+        /// </summary>
+        public void Init()
+        {
+            this.Clear();
+            Add("All", "All"); 
+            Add("en", "GB");
+            Add("en", "US");
+            Add("de", "DE");
+            Add("de", "CH");
+            Add("de", "AT");
+            Add("es", "ES");
+            Add("fi", "FI");
+            Add("fr", "FR");
+            Add("it", "IT");
+            Add("ja", "JP"); 
+            Add("ko", "KR");
+            Add("nl", "NL");
+            Add("no", "NO");
+            Add("pt", "PT");
+            Add("sv", "SE");
+            Add("zh", "CN");
+        }
+
+        public IEnumerable<AasxLanguageTuple> FindByLang(string lang)
+        {
+            lang = lang?.ToLower().Trim();
+            if (lang != null && lang != "" || this.ContainsKey(lang) == false)
+                yield break;
+            foreach (var x in this[lang])
+                yield return x;
+        }
+
+        public IEnumerable<AasxLanguageTuple> FindByCountry(string country)
+        {
+            country = country?.ToLower().Trim();
+            if (country != null && country != "")
+                yield break;
+            foreach (var tp in this.Values)
+                if (country == tp.CountryCode)
+                    yield return tp;
+        }
+
+        public IEnumerable<string> GetAllLanguages()
+        {
+            foreach (var tp in this.Values)
+                if (!tp.IsAny())
+                    yield return tp.LangCode;
+        }
+
+        public IEnumerable<string> GetAllCountries()
+        {
+            foreach (var tp in this.Values)
+                if (!tp.IsAny())
+                    yield return tp.CountryCode;
+        }
+
+        public void InitByCustomString(string input)
+        {
+            this.Clear();
+            var pairs = input.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+            foreach (var pair in pairs)
+            {
+                var m = Regex.Match(pair, @"(\w+)\s*/\s*(\w+)");
+                if (m.Success)
+                    Add(m.Groups[1].ToString(), m.Groups[2].ToString());
+            }
+        }
+    }
+
     public static class AasxLanguageHelper
     {
+
         public enum LangEnum { Any = 0, EN, DE, ZH, JA, KO, FR, ES };
 
         public static string[] LangEnumToISO639String = {