using ChatTwo.Ui;
using Dalamud.Interface;
using Dalamud.Interface.GameFonts;
using Dalamud.Interface.ManagedFontAtlas;
using Dalamud.Interface.Utility;
using ImGuiNET;

namespace ChatTwo;

public class FontManager
{
    private readonly Plugin Plugin;

    internal IFontHandle Axis { get; private set; }
    internal IFontHandle AxisItalic { get; private set; }

    internal IFontHandle RegularFont { get; private set; }
    internal IFontHandle? ItalicFont { get; private set; }

    internal IFontHandle FontAwesome { get; private set; }

    private FaceData _regularFont;
    private FaceData? _italicFont;
    private FaceData _jpFont;
    private FaceData _gameSymFont;

    private ushort[] _ranges;
    private ushort[] _jpRange;
    private ushort[] _symRange = [0xE020, 0xE0DB, 0];

    public FontManager(Plugin plugin)
    {
        Plugin = plugin;

        byte[] gameSym;
        var filePath = Path.Combine(Plugin.Interface.ConfigDirectory.FullName, "FFXIV_Lodestone_SSF.ttf");
        if (File.Exists(filePath))
        {
            gameSym = File.ReadAllBytes(filePath);
        }
        else
        {
            gameSym = new HttpClient().GetAsync("https://img.finalfantasyxiv.com/lds/pc/global/fonts/FFXIV_Lodestone_SSF.ttf")
                .Result
                .Content
                .ReadAsByteArrayAsync()
                .Result;

            Dalamud.Utility.Util.WriteAllBytesSafe(filePath, gameSym);
        }

        _gameSymFont = new FaceData(gameSym);
    }

    private byte[] GetResource(string name)
    {
        var stream = GetType().Assembly.GetManifestResourceStream(name)!;
        var memory = new MemoryStream();
        stream.CopyTo(memory);
        return memory.ToArray();
    }

    private unsafe void SetUpRanges()
    {
        ushort[] BuildRange(IReadOnlyList<ushort>? chars, params nint[] ranges)
        {
            var builder = new ImFontGlyphRangesBuilderPtr(ImGuiNative.ImFontGlyphRangesBuilder_ImFontGlyphRangesBuilder());
            // text
            foreach (var range in ranges)
                builder.AddRanges(range);

            // chars
            if (chars != null)
            {
                for (var i = 0; i < chars.Count; i += 2)
                {
                    if (chars[i] == 0)
                        break;

                    for (var j = (uint) chars[i]; j <= chars[i + 1]; j++)
                        builder.AddChar((ushort) j);
                }
            }

            // various symbols
            // French
            // Romanian
            builder.AddText("←→↑↓《》■※☀★★☆♥♡ヅツッシ☀☁☂℃℉°♀♂♠♣♦♣♧®©™€$£♯♭♪✓√◎◆◇♦■□〇●△▽▼▲‹›≤≥<«“”─＼～");
            builder.AddText("Œœ");
            builder.AddText("ĂăÂâÎîȘșȚț");

            // "Enclosed Alphanumerics" (partial) https://www.compart.com/en/unicode/block/U+2460
            for (var i = 0x2460; i <= 0x24B5; i++)
                builder.AddChar((char) i);

            builder.AddChar('⓪');
            return builder.BuildRangesToArray();
        }

        var ranges = new List<nint> { ImGui.GetIO().Fonts.GetGlyphRangesDefault() };
        foreach (var extraRange in Enum.GetValues<ExtraGlyphRanges>())
            if (Plugin.Config.ExtraGlyphRanges.HasFlag(extraRange))
                ranges.Add(extraRange.Range());

        _ranges = BuildRange(null, ranges.ToArray());
        _jpRange = BuildRange(GlyphRangesJapanese.GlyphRanges);
    }

    private void SetUpUserFonts()
    {
        FontData? fontData = null;
        if (Plugin.Config.GlobalFont.StartsWith(Fonts.IncludedIndicator))
        {
            var globalFont = Fonts.GlobalFonts.FirstOrDefault(font => font.Name == Plugin.Config.GlobalFont);
            if (globalFont != null)
            {
                var regular = new FaceData(GetResource(globalFont.ResourcePath));
                var italic = new FaceData(GetResource(globalFont.ResourcePathItalic));
                fontData = new FontData(regular, italic);
            }
        }
        else
        {
            fontData = Fonts.GetFont(Plugin.Config.GlobalFont, true);
        }

        if (fontData == null)
        {
            Plugin.Config.GlobalFont = Fonts.GlobalFonts[0].Name;
            Plugin.SaveConfig();

            var globalFont = Fonts.GlobalFonts[0];
            var regular = new FaceData(GetResource(globalFont.ResourcePath));
            var italic = new FaceData(GetResource(globalFont.ResourcePathItalic));
            fontData = new FontData(regular, italic);
        }

        _regularFont = fontData.Regular;
        _italicFont = fontData.Italic ?? null;

        FontData? jpFontData = null;
        if (Plugin.Config.JapaneseFont.StartsWith(Fonts.IncludedIndicator))
        {
            var jpFont = Fonts.JapaneseFonts.FirstOrDefault(item => item.Item1 == Plugin.Config.JapaneseFont);
            if (jpFont != default)
                jpFontData = new FontData(new FaceData(GetResource(jpFont.Item2)), null);
        }
        else
        {
            jpFontData = Fonts.GetFont(Plugin.Config.JapaneseFont, false);
        }

        if (jpFontData == null)
        {
            Plugin.Config.JapaneseFont = Fonts.JapaneseFonts[0].Item1;
            Plugin.SaveConfig();

            var jpFont = Fonts.JapaneseFonts[0];
            jpFontData = new FontData(new FaceData(GetResource(jpFont.Item2)), null);
        }

        _jpFont = jpFontData.Regular;
    }

    public void BuildFonts()
    {
        SetUpRanges();
        SetUpUserFonts();

        Axis = Plugin.Interface.UiBuilder.FontAtlas.NewGameFontHandle(new GameFontStyle(GameFontFamily.Axis, Plugin.Config.FontSize));
        AxisItalic = Plugin.Interface.UiBuilder.FontAtlas.NewGameFontHandle(new GameFontStyle(GameFontFamily.Axis, Plugin.Config.FontSize)
        {
            SkewStrength = Plugin.Config.FontSize / 6
        });

        FontAwesome = Plugin.Interface.UiBuilder.FontAtlas.NewDelegateFontHandle(e =>
        {
            e.OnPreBuild(tk => tk.AddFontAwesomeIconFont(new SafeFontConfig { SizePx = Plugin.Config.FontSize }));
            e.OnPostBuild(tk => tk.FitRatio(tk.Font));
        });

        RegularFont = Plugin.Interface.UiBuilder.FontAtlas.NewDelegateFontHandle(
            e => e.OnPreBuild(
                tk =>
                {
                    var config = new SafeFontConfig { SizePx = Plugin.Config.FontSize, GlyphRanges = _ranges };
                    config.MergeFont = tk.AddFontFromMemory(_regularFont.Data, config, "ChatTwo2 RegularFont");

                    config.SizePx = Plugin.Config.JapaneseFontSize;
                    config.GlyphRanges = _jpRange;
                    tk.AddFontFromMemory(_jpFont.Data, config, "ChatTwo2 JP Regular");

                    config.SizePx = Plugin.Config.SymbolsFontSize;
                    config.GlyphRanges = _symRange;
                    tk.AddFontFromMemory(_gameSymFont.Data, config, "ChatTwo2 Sym Font");

                    tk.Font = config.MergeFont;
                }
            ));

        // load italic noto sans and merge in jp + game icons
        ItalicFont = null;
        if (_italicFont != null)
        {
            ItalicFont = Plugin.Interface.UiBuilder.FontAtlas.NewDelegateFontHandle(
                e => e.OnPreBuild(
                    tk =>
                    {
                        var config = new SafeFontConfig { SizePx = Plugin.Config.FontSize, GlyphRanges = _ranges };
                        config.MergeFont = tk.AddFontFromMemory(_italicFont.Data, config, "ChatTwo2 ItalicFont");

                        config.SizePx = Plugin.Config.JapaneseFontSize;
                        config.GlyphRanges = _jpRange;
                        tk.AddFontFromMemory(_jpFont.Data, config, "ChatTwo2 JP Regular");

                        config.SizePx = Plugin.Config.SymbolsFontSize;
                        config.GlyphRanges = _symRange;
                        tk.AddFontFromMemory(_gameSymFont.Data, config, "ChatTwo2 Sym Font");

                        tk.Font = config.MergeFont;
                    }
                ));
        }
    }
}