FactorioModManager/FactorioModManager/LanguageManager.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace FactorioModManager
{
    public class LanguageManager
    {
        /// <summary>
        /// Path to the folder with language files relative to the CURRENT program folder
        /// </summary>
        public static string LanguageDir { get; set; } = "lang";

        /// <summary>
        /// List of available languages
        /// </summary>
        public static List<string> AvailableLangs { get { return _langs; } }

        private static List<string> _langs = new List<string>();
        private static Dictionary<string, string> _lines = new Dictionary<string, string>();
        private static string _current_lang = null;

        public static bool LanguageFounded { get; private set; } = false;

        /// <summary>
        /// Applies the selected language to all form controls
        /// </summary>
        /// <param name="lang">Selected language</param>
        /// <param name="form">Target form</param>
        /// <returns>Returns true if localization has been SUCCESSFULLY applied to ALL form elements</returns>
        public static bool ApplyLanguage(string lang, Form form)
        {
            bool result = true;
            if (form.Tag != null)
            {
                string text = GetStringByTag(lang, (string)form.Tag);
                if (text == (string)form.Tag) result = false;
                form.Text = text;
            }
            foreach(Control ctrl in form.Controls)
            {
                bool tmp = ApplyLanguage(lang, ctrl);
                result = result && tmp;
            }
            return result;
        }

        /// <summary>
        /// Applies the selected language to this control
        /// </summary>
        /// <param name="lang">Selected language</param>
        /// <param name="control">Target control</param>
        /// <returns>Returns true if localization has been SUCCESSFULLY applied</returns>
        public static bool ApplyLanguage(string lang, Control control)
        {
            
            bool result = true;
            if (control.Tag != null)
            {
                if ((string)control.Tag == "$Empty") control.Text = String.Empty;
                else
                {
                    string text = GetStringByTag(lang, (string)control.Tag);
                    if (text == (string)control.Tag) result = false;
                    control.Text = text;
                }
            }
            if (control.HasChildren)
            {
                foreach (Control ctrl in control.Controls)
                {
                    bool tmp = ApplyLanguage(lang, ctrl);
                    result = result && tmp;
                }
            }
            if (control is MenuStrip)
            {
                foreach (ToolStripMenuItem ctrl in ((MenuStrip)control).Items)
                {
                    bool tmp = ApplyLanguage(lang, ctrl);
                    result = result && tmp;
                }
            }
            if(control is ListView)
            {
                foreach (ColumnHeader ctrl in ((ListView)control).Columns)
                {
                    bool tmp = ApplyLanguage(lang, ctrl);
                    result = result && tmp;
                }
            }
            return result;
        }

        public static bool ApplyLanguage(string lang, ColumnHeader control)
        {

            bool result = true;
            if (control.Tag != null)
            {
                if (control.Tag.ToString().StartsWith("$")) {
                    string text = GetStringByTag(lang, (string)control.Tag);
                    if (text == (string)control.Tag) result = false;
                    control.Text = text;
                }
                else
                {
                    control.Text = "";
                }
            }
            return result;
        }

        public static bool ApplyLanguage(string lang, ToolStripMenuItem control)
        {

            bool result = true;
            if (control.Tag != null)
            {
                if ((string)control.Tag == "$Empty") control.Text = String.Empty;
                else
                {
                    string text = GetStringByTag(lang, (string)control.Tag);
                    if (text == (string)control.Tag) result = false;
                    control.Text = text;
                }
            }
            if (control.HasDropDownItems)
            {
                for(int i = 0; i < control.DropDownItems.Count; i++)
                {
                    if(!(control.DropDownItems[i] is ToolStripSeparator))
                    {
                        bool tmp = ApplyLanguage(lang, (ToolStripMenuItem)control.DropDownItems[i]);
                        result = result && tmp;
                    }
                }
            }
            return result;
        }

        /// <summary>
        /// Returns a string containing the localized decryption of the tag. If there is none, it returns the tag.
        /// </summary>
        /// <param name="lang">Language</param>
        /// <param name="tag">Tag</param>
        /// <returns></returns>
        public static string GetStringByTag(string lang,string tag)
        {
            if (LanguageFounded)
            {
                if (_current_lang == null || _current_lang != lang || _lines.Count == 0)
                {
                    StreamReader sr = new StreamReader(Path.Combine(Directory.GetCurrentDirectory(), LanguageDir, lang + ".lang"));
                    List<string> lines = sr.ReadToEnd().Split('\n').ToList();
                    sr.Close();
                    _lines.Clear();
                    for (int i = 0; i < lines.Count; i++)
                    {
                        if (!String.IsNullOrEmpty(lines[i]))
                        {
                            string key, value;
                            lines[i] = lines[i].Trim();
                            key = lines[i].Split('=')[0];
                            value = lines[i].Split('=')[1];
                            value = value.Replace("\\n", "\n").Replace("\\t", "\t");
                            _lines.Add(key, value);
                        }
                    }

                }
            }
            if (_lines.ContainsKey(tag)) return _lines[tag];
            else return tag;
            
            
        }

        /// <summary>
        /// Scans the folder for language files
        /// </summary>
        /// <param name="recursivly">DO NOT SET TO TRUE!!!</param>
        public static void ScanForLanguages(bool recursivly = false)
        {
            Directory.CreateDirectory(LanguageDir);
            List<string> files = Directory.GetFiles(Path.Combine(Directory.GetCurrentDirectory(), LanguageDir)).ToList();
            for (int i = 0; i < files.Count; i++)
            {

                if (files[i].EndsWith(".lang"))
                {
                    files[i] = files[i].Substring(files[i].LastIndexOf('\\') + 1);
                    files[i] = files[i].Substring(0, files[i].LastIndexOf('.'));
                }
            }
            _langs = files;
            LanguageFounded = files.Count > 0;

            if (!LanguageFounded && !recursivly)
            {
                Stream default_language = Assembly.GetExecutingAssembly().GetManifestResourceStream(Assembly.GetExecutingAssembly().GetName().Name + "." + "en.lang");
                if (default_language == null) return;
                FileStream file = new FileStream(Path.Combine(LanguageDir, "en.lang"), FileMode.CreateNew, FileAccess.Write);
                default_language.CopyTo(file);
                file.Dispose();
                default_language.Dispose();

                ScanForLanguages(true);
            }
        }

        public static string Get(string tag)
        {
            return GetStringByTag(_current_lang, tag);
        }
    }
}