using System;
using System.Collections.Generic;
using System.Windows.Forms;
using FastReport.Utils;
using System.IO;
using System.Globalization;

namespace FastReport.Forms
{
    internal partial class SelectLanguageForm : BaseDialogForm
    {
        private void Init()
        {
            tbFolder.Text = Res.LocaleFolder;
            PopulateLocalizations(tbFolder.Text);
        }

        private void Done()
        {
            // convert selected locale name from Native name to English name
            string localeName = (lbxLanguages.SelectedIndex <= 0 ? "" : (string)lbxLanguages.SelectedItem).ToUpper();
            if (localeName != "")
            {
                CultureInfo[] infos = CultureInfo.GetCultures(CultureTypes.AllCultures);
                foreach (CultureInfo info in infos)
                {
                    if (String.Compare(info.NativeName.ToUpper(), localeName, true) == 0)
                    {
                        localeName = info.EnglishName;
                        break;
                    }
                }
            }

            Res.DefaultLocaleName = localeName;
            Res.LocaleFolder = tbFolder.Text;
            Res.LoadDefaultLocale();
        }

        private string ToUpperFirstLetter(string source)
        {
            if (string.IsNullOrEmpty(source))
                return string.Empty;
            char[] letters = source.ToCharArray();
            letters[0] = char.ToUpper(letters[0]);
            return new string(letters);
        }

        private void PopulateLocalizations(string folder)
        {
            lbxLanguages.Items.Clear();
            lbxLanguages.Items.Add(Res.Get("Forms,SelectLanguage,Auto"));
            lbxLanguages.SelectedIndex = 0;

            List<string> files = new List<string>();
            if (Directory.Exists(folder))
            {
                foreach (string file in Directory.GetFiles(folder, "*.frl"))
                {
                    files.Add(Path.GetFileNameWithoutExtension(file));
                }
            }
            files.Add("English");
            files.Sort();

            // convert English locale name to DisplayName
            CultureInfo[] infos = CultureInfo.GetCultures(CultureTypes.AllCultures);
            List<string> names = new List<string>();
            string defaultName = "";
            foreach (string file in files)
            {
                string name = file;
                foreach (CultureInfo info in infos)
                {
                    if (String.Compare(info.EnglishName, file, true) == 0)
                    {
                        name = ToUpperFirstLetter(info.NativeName);
                        break;
                    }
                }
                names.Add(name);
                if (String.Compare(file, Res.DefaultLocaleName, true) == 0)
                    defaultName = name;
            }
            names.Sort();

            foreach (string name in names)
            {
                lbxLanguages.Items.Add(name);
            }
            if (defaultName != "")
                lbxLanguages.SelectedItem = defaultName;
        }

        private void tbFolder_ButtonClick(object sender, EventArgs e)
        {
            using (FolderBrowserDialog dialog = new FolderBrowserDialog())
            {
                dialog.SelectedPath = tbFolder.Text;
                dialog.ShowNewFolderButton = false;
                dialog.Description = Res.Get("Forms,SelectLanguage,SelectFolder");
                if (dialog.ShowDialog() == DialogResult.OK)
                {
                    tbFolder.Text = dialog.SelectedPath;
                    PopulateLocalizations(tbFolder.Text);
                }
            }
        }

        private void lbxLanguages_DoubleClick(object sender, EventArgs e)
        {
            DialogResult = DialogResult.OK;
        }

        private void SelectLanguageForm_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (DialogResult == DialogResult.OK)
                Done();
        }

        public override void Localize()
        {
            base.Localize();

            MyRes res = new MyRes("Forms,SelectLanguage");
            Text = res.Get("");
            lblSelect.Text = res.Get("SelectLanguage");
            lblFolder.Text = res.Get("Folder");
        }

        public override void UpdateDpiDependencies()
        {
            base.UpdateDpiDependencies();
            lbxLanguages.Height = lblFolder.Top - lbxLanguages.Top - 12;
            tbFolder.Image = GetImage(1);
        }

        public SelectLanguageForm()
        {
            InitializeComponent();
            Localize();
            Init();
            UIUtils.CheckRTL(this);
            UpdateDpiDependencies();
        }
    }
}