using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Media;

namespace QuickClaude
{
    // The same font choices as wIRC. Saved in settings.json by Name.
    //  - Windows fonts (Segoe UI, Tahoma, Tw Cen MT) aren't bundled; they're listed only when
    //    installed (Tw Cen MT only comes with Office).
    //  - The rounded fonts (Nunito, Quicksand, Varela Round) are SIL OFL licensed and built into
    //    the exe from the fonts folder, with their license files.
    // An unknown or missing font falls back to Consolas.
    public static class Fonts
    {
        public const string Default = "Consolas";

        static readonly Uri PackRoot = new Uri("pack://application:,,,/");

        public class Choice
        {
            public string Name;
            public FontFamily Family;
        }

        static List<Choice> choices;

        public static List<Choice> All
        {
            get
            {
                if (choices != null) return choices;
                var installed = new HashSet<string>(
                    System.Windows.Media.Fonts.SystemFontFamilies.Select(f => f.Source),
                    StringComparer.OrdinalIgnoreCase);

                choices = new List<Choice>
                {
                    new Choice { Name = "Consolas", Family = new FontFamily("Consolas, Courier New") }
                };
                foreach (var sys in new[] { "Segoe UI", "Tahoma", "Tw Cen MT" })
                    if (installed.Contains(sys))
                        choices.Add(new Choice { Name = sys, Family = new FontFamily(sys) });

                choices.Add(Bundled("Nunito (rounded)", "Nunito"));
                choices.Add(Bundled("Quicksand (rounded)", "Quicksand"));
                choices.Add(Bundled("Varela Round (rounded)", "Varela Round"));
                return choices;
            }
        }

        static Choice Bundled(string name, string family) =>
            new Choice { Name = name, Family = new FontFamily(PackRoot, "./fonts/#" + family + ", Consolas") };

        public static Choice Find(string name) =>
            All.FirstOrDefault(c => string.Equals(c.Name, name, StringComparison.OrdinalIgnoreCase)) ?? All[0];
    }
}