using System.Numerics;
using ImGuiNET;

namespace PartyDamage;

public class PluginUi : IDisposable {
    private Plugin Plugin { get; }
    internal bool Visible;

    public PluginUi(Plugin plugin) {
        this.Plugin = plugin;

        this.Plugin.Interface.UiBuilder.Draw += this.Draw;
    }

    public void Dispose() {
        this.Plugin.Interface.UiBuilder.Draw -= this.Draw;
    }

    private void Draw() {
        var anyChanged = false;

        ImGui.TextUnformatted("Meter mode");
        if (ImGui.BeginCombo("##mode", Enum.GetName(this.Plugin.Config.Mode))) {
            using var endCombo = new OnDispose(ImGui.EndCombo);

            foreach (var mode in Enum.GetValues<MeterMode>()) {
                if (ImGui.Selectable(Enum.GetName(mode), mode == this.Plugin.Config.Mode)) {
                    anyChanged = true;
                    this.Plugin.Config.Mode = mode;
                }
            }
        }

        anyChanged |= ImGui.Checkbox("Use DPS bars behind party list", ref this.Plugin.Config.UseDpsBar);
        var barAlpha = this.Plugin.Config.BarAlpha * 100;
        if (ImGui.SliderFloat("Bar opacity", ref barAlpha, 0, 100, "%.2f%%")) {
            this.Plugin.Config.BarAlpha = Math.Clamp(barAlpha / 100, 0, 1);
        }

        anyChanged |= ImGui.Checkbox("Alternate between values", ref this.Plugin.Config.Alternate);
        using (ImGuiHelper.DisabledUnless(this.Plugin.Config.Alternate)) {
            anyChanged |= ImGui.SliderFloat("Seconds before alternating", ref this.Plugin.Config.AlternateSeconds, 0.5f, 60f);
        }

        using (ImGuiHelper.DisabledUnless(this.Plugin.Config.Alternate && this.Plugin.Config.Mode == MeterMode.Name)) {
            anyChanged |= ImGui.Checkbox("Only alternate on jobs that use mana", ref this.Plugin.Config.ManaModeAlternateOnlyManaUsers);
        }

        var textColour = ConvertRgba(this.Plugin.Config.DpsColour);
        if (ImGui.ColorPicker3("DPS text colour", ref textColour)) {
            anyChanged = true;
            this.Plugin.Config.DpsColour = ConvertRgba(textColour);
        }
    }

    private static Vector3 ConvertRgba(uint colour) {
        var red = colour & 0xFF;
        var green = (colour >> 8) & 0xFF;
        var blue = (colour >> 16) & 0xFF;
        // var alpha = colour >> 24;

        return new Vector3(red / 255f, green / 255f, blue / 255f);
    }

    private static uint ConvertRgba(Vector3 parts) {
        var red = (uint) Math.Round(parts.X * 255);
        var green = (uint) Math.Round(parts.Y * 255);
        var blue = (uint) Math.Round(parts.Z * 255);

        return (red << 24)
            | (green << 16)
            | (blue << 8)
            | 0xFF;
    }
}