using Dalamud.Bindings.ImGui;
using Dalamud.Game.Text.SeStringHandling;
using Dalamud.Game.Text.SeStringHandling.Payloads;
using Dalamud.Interface;
using Dalamud.Interface.ImGuiSeStringRenderer;
using Dalamud.Interface.Utility;
using Lumina.Text;
using System;
using System.Numerics;
using System.Threading;
using DalamudSeString = Dalamud.Game.Text.SeStringHandling.SeString;
using DalamudSeStringBuilder = Dalamud.Game.Text.SeStringHandling.SeStringBuilder;
using LuminaSeStringBuilder = Lumina.Text.SeStringBuilder;

namespace LightlessSync.Utils;

public static class SeStringUtils
{
    private static int _seStringHitboxCounter;
    private static int _iconHitboxCounter;

    public static DalamudSeString BuildFormattedPlayerName(string text, Vector4? textColor, Vector4? glowColor)
    {
        var b = new DalamudSeStringBuilder();

        if (glowColor is Vector4 glow)
            b.Add(new GlowPayload(glow));

        if (textColor is Vector4 color)
            b.Add(new ColorPayload(color));

        b.AddText(text ?? string.Empty);

        if (textColor is not null)
            b.Add(new ColorEndPayload());

        if (glowColor is not null)
            b.Add(new GlowEndPayload());

        return b.Build();
    }

    public static DalamudSeString BuildPlain(string text)
    {
        var b = new DalamudSeStringBuilder();
        b.AddText(text ?? string.Empty);
        return b.Build();
    }

    public static DalamudSeString BuildRichText(ReadOnlySpan<RichTextEntry> fragments)
    {
        var builder = new LuminaSeStringBuilder();

        foreach (var fragment in fragments)
        {
            if (string.IsNullOrEmpty(fragment.Text))
                continue;

            var hasColor = fragment.Color.HasValue;
            if (hasColor)
            {
                Vector4 color = fragment.Color!.Value;
                builder.PushColorRgba(color);
            }

            if (fragment.Bold)
                builder.AppendSetBold(true);

            builder.Append(fragment.Text.AsSpan());

            if (fragment.Bold)
                builder.AppendSetBold(false);

            if (hasColor)
                builder.PopColor();
        }

        return DalamudSeString.Parse(builder.ToArray());
    }

    public static DalamudSeString BuildRichText(params RichTextEntry[] fragments) => BuildRichText(fragments.AsSpan());
    public static void RenderSeString(DalamudSeString seString, Vector2 position, ImFontPtr? font = null, ImDrawListPtr? drawList = null)
    {
        drawList ??= ImGui.GetWindowDrawList();

        var drawParams = new SeStringDrawParams
        {
            Font = font ?? UiBuilder.MonoFont,
            Color = 0xFFFFFFFF,
            WrapWidth = float.MaxValue,
            TargetDrawList = drawList
        };

        ImGui.SetCursorScreenPos(position);
        ImGuiHelpers.SeStringWrapped(seString.Encode(), drawParams);

        var textSize = ImGui.CalcTextSize(seString.TextValue);
        if (textSize.Y <= 0f)
            textSize.Y = ImGui.GetTextLineHeight();

        ImGui.Dummy(new Vector2(0f, textSize.Y));
    }

    public static void RenderSeStringWrapped(DalamudSeString seString, float wrapWidth, ImFontPtr? font = null, ImDrawListPtr? drawList = null)
    {
        drawList ??= ImGui.GetWindowDrawList();

        var drawParams = new SeStringDrawParams
        {
            Font = font ?? ImGui.GetFont(),
            Color = ImGui.GetColorU32(ImGuiCol.Text),
            WrapWidth = wrapWidth,
            TargetDrawList = drawList
        };

        ImGuiHelpers.SeStringWrapped(seString.Encode(), drawParams);

        var calcWrapWidth = wrapWidth > 0f ? wrapWidth : -1f;
        var textSize = ImGui.CalcTextSize(seString.TextValue, wrapWidth: calcWrapWidth);
        if (textSize.Y <= 0f)
            textSize.Y = ImGui.GetTextLineHeight();

        ImGui.Dummy(new Vector2(0f, textSize.Y));
    }
    public static Vector2 RenderSeStringWithHitbox(DalamudSeString seString, Vector2 position, ImFontPtr? font = null, string? id = null)
    {
        var drawList = ImGui.GetWindowDrawList();

        var drawParams = new SeStringDrawParams
        {
            Font = font ?? UiBuilder.MonoFont,
            Color = 0xFFFFFFFF,
            WrapWidth = float.MaxValue,
            TargetDrawList = drawList
        };

        ImGui.SetCursorScreenPos(position);
        ImGuiHelpers.SeStringWrapped(seString.Encode(), drawParams);

        var textSize = ImGui.CalcTextSize(seString.TextValue);

        ImGui.SetCursorScreenPos(position);
        if (id is not null)
        {
            ImGui.PushID(id);
        }
        else
        {
            ImGui.PushID(Interlocked.Increment(ref _seStringHitboxCounter));
        }

        try
        {
            ImGui.InvisibleButton("##hitbox", textSize);
        }
        finally
        {
            ImGui.PopID();
        }

        return textSize;
    }

    public static Vector2 RenderIconWithHitbox(int iconId, Vector2 position, ImFontPtr? font = null, string? id = null)
    {
        var drawList = ImGui.GetWindowDrawList();

        var drawParams = new SeStringDrawParams
        {
            Font = font ?? UiBuilder.MonoFont,
            Color = 0xFFFFFFFF,
            WrapWidth = float.MaxValue,
            TargetDrawList = drawList
        };

        var iconMacro = $"<icon({iconId})>";
        var drawResult = ImGuiHelpers.CompileSeStringWrapped(iconMacro, drawParams);

        ImGui.SetCursorScreenPos(position);
        if (id is not null)
        {
            ImGui.PushID(id);
        }
        else
        {
            ImGui.PushID(Interlocked.Increment(ref _iconHitboxCounter));
        }

        try
        {
            ImGui.InvisibleButton("##iconHitbox", drawResult.Size);
        }
        finally
        {
            ImGui.PopID();
        }

        return drawResult.Size;
    }

    #region Internal Payloads

    public readonly record struct RichTextEntry(string Text, Vector4? Color = null, bool Bold = false);

    private abstract class AbstractColorPayload : Payload
    {
        protected byte Red { get; init; }
        protected byte Green { get; init; }
        protected byte Blue { get; init; }

        protected override byte[] EncodeImpl()
        {
            return new byte[] { 0x02, ChunkType, 0x05, 0xF6, Red, Green, Blue, 0x03 };
        }

        protected override void DecodeImpl(BinaryReader reader, long endOfStream) { }

        public override PayloadType Type => PayloadType.Unknown;
        protected abstract byte ChunkType { get; }
    }

    private abstract class AbstractColorEndPayload : Payload
    {
        protected override byte[] EncodeImpl()
        {
            return new byte[] { 0x02, ChunkType, 0x02, 0xEC, 0x03 };
        }

        protected override void DecodeImpl(BinaryReader reader, long endOfStream) { }

        public override PayloadType Type => PayloadType.Unknown;
        protected abstract byte ChunkType { get; }
    }

    private sealed class ColorPayload : AbstractColorPayload
    {
        protected override byte ChunkType => 0x13;

        public ColorPayload(Vector3 color)
        {
            Red = Math.Max((byte)1, (byte)(color.X * 255f));
            Green = Math.Max((byte)1, (byte)(color.Y * 255f));
            Blue = Math.Max((byte)1, (byte)(color.Z * 255f));
        }

        public ColorPayload(Vector4 color) : this(new Vector3(color.X, color.Y, color.Z)) { }
    }

    private sealed class ColorEndPayload : AbstractColorEndPayload
    {
        protected override byte ChunkType => 0x13;
    }

    private sealed class GlowPayload : AbstractColorPayload
    {
        protected override byte ChunkType => 0x14;

        public GlowPayload(Vector3 color)
        {
            Red = Math.Max((byte)1, (byte)(color.X * 255f));
            Green = Math.Max((byte)1, (byte)(color.Y * 255f));
            Blue = Math.Max((byte)1, (byte)(color.Z * 255f));
        }

        public GlowPayload(Vector4 color) : this(new Vector3(color.X, color.Y, color.Z)) { }
    }

    private sealed class GlowEndPayload : AbstractColorEndPayload
    {
        protected override byte ChunkType => 0x14;
    }

    #endregion
}