using System;
using System.Globalization;

using Avalonia.Data.Converters;
using Avalonia.Styling;

namespace SourceGit.Converters
{
    public static class StringConverters
    {
        public class ToLocaleConverter : IValueConverter
        {
            public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
            {
                return Models.Locale.Supported.Find(x => x.Key == value as string);
            }

            public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
            {
                return (value as Models.Locale).Key;
            }
        }

        public static readonly ToLocaleConverter ToLocale = new ToLocaleConverter();

        public class ToThemeConverter : IValueConverter
        {
            public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
            {
                var theme = (string)value;
                if (theme.Equals("Light", StringComparison.OrdinalIgnoreCase))
                {
                    return ThemeVariant.Light;
                }
                else if (theme.Equals("Dark", StringComparison.OrdinalIgnoreCase))
                {
                    return ThemeVariant.Dark;
                }
                else
                {
                    return ThemeVariant.Default;
                }
            }

            public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
            {
                var theme = (ThemeVariant)value;
                return theme.Key;
            }
        }

        public static readonly ToThemeConverter ToTheme = new ToThemeConverter();

        public class FormatByResourceKeyConverter : IValueConverter
        {
            public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
            {
                var key = parameter as string;
                return App.Text(key, value);
            }

            public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
            {
                throw new NotImplementedException();
            }
        }

        public static readonly FormatByResourceKeyConverter FormatByResourceKey = new FormatByResourceKeyConverter();

        public static readonly FuncValueConverter<string, string> ToShortSHA =
            new FuncValueConverter<string, string>(v => v.Length > 10 ? v.Substring(0, 10) : v);
        
        public static readonly FuncValueConverter<string, bool> UnderRecommendGitVersion =
            new(v =>
            {
                if (string.IsNullOrEmpty(v))
                    return true;
                var versionParts = v.Split(new[] { '.', '-' }, StringSplitOptions.RemoveEmptyEntries);
                if (versionParts.Length < 3)
                    return true;
                if (!int.TryParse(versionParts[0], out var major) ||
                    !int.TryParse(versionParts[1], out var minor) ||
                    !int.TryParse(versionParts[2], out var build))
                    return true;
                var gitVersion = new Version(major, minor, build);
                var targetVersion = new Version(2, 23, 0);
                return gitVersion < targetVersion;
            });
    }
}