using System.Numerics;
using ImGuiNET;
using Raylib_cs;
using rlImGui_cs;
using SzGui.Windows;

namespace SzGui;

public class SzApp
{
    public static readonly SzApp AppInstance = new();
    private SzApp() { }
    
    private List<SzGuiWindowBase> _activeWindows = new();

    public void ActivateWindow(SzGuiWindowBase window)
    {
        if (_activeWindows.Any(w => w.GetType() == window.GetType()))
        {
            ImGui.SetWindowFocus(window.WindowName);
            return;
        }
    
        _activeWindows.Add(window);
    }
    
    public void Init()
    {
        ApplicationSettings.LoadSettings();
        
        Raylib.SetConfigFlags(ConfigFlags.Msaa4xHint | ConfigFlags.VSyncHint | ConfigFlags.ResizableWindow);        
        Raylib.InitWindow(1280, 800, "SessionZero");
        
        rlImGui.Setup(true, true);
        ImGui.GetIO().ConfigWindowsMoveFromTitleBarOnly = true;
        
        if (ApplicationSettings.GetSettingValue<bool>("ShowStartup")) ActivateWindow(new StartupWindow());
        
        while (!Raylib.WindowShouldClose())
        {
            Raylib.BeginDrawing();
            Raylib.ClearBackground(Color.Gray);
            rlImGui.Begin();

            ImGui.PushStyleColor(ImGuiCol.WindowBg, new Vector4(0, 0, 0, 0));
            ImGui.DockSpaceOverViewport(0);
            ImGui.PopStyleColor();
            
            HandleShortcuts();
            DrawImGui();
            
            rlImGui.End();
            Raylib.EndDrawing();
        }

        rlImGui.Shutdown();
        Raylib.CloseWindow();
    }
    
    private void HandleShortcuts()
    {
        var io = ImGui.GetIO();
        
        if (io is { KeyCtrl: true, KeyAlt: true } && ImGui.IsKeyPressed(ImGuiKey.S))
        {
            ActivateWindow(new SettingsWindow());
        }

        if (io is { KeyCtrl: true, KeyAlt: true } && ImGui.IsKeyPressed(ImGuiKey.Q))
        {
            Raylib.CloseWindow();
        }
    }
    
    private void UpdateImGuiTheme()
    {
        var c = ApplicationSettings.GetSettingValue<Color>("BackgroundColor");
        Vector4 styleColor = new Vector4(c.R / 255f, c.G / 255f, c.B / 255f, 1.0f);
        ImGui.GetStyle().Colors[(int)ImGuiCol.WindowBg] = styleColor;
    }

    private void DrawImGui()
    {
        DrawGlobalMenuBar();
        
        for (int i = _activeWindows.Count - 1; i >= 0; i--)
        {
            _activeWindows[i].Draw();
            if (!_activeWindows[i].IsOpen) _activeWindows.RemoveAt(i);
        }
    }

    private void DrawGlobalMenuBar()
    {
        if (ImGui.BeginMainMenuBar())
        {
            if (ImGui.BeginMenu("File"))
            {
                if (ImGui.MenuItem("Exit", "Ctrl+Alt+Q")) Raylib.CloseWindow();
                ImGui.EndMenu();
            }

            if (ImGui.BeginMenu("Edit"))
            {
                if (ImGui.MenuItem("Settings", "Ctrl+Alt+S")) 
                {
                    ActivateWindow(new SettingsWindow());
                }
                ImGui.EndMenu();
            }

            if (ImGui.BeginMenu("View"))
            {
                if (ImGui.MenuItem("Start window"))
                {
                    ActivateWindow(new StartupWindow());
                }
                ImGui.EndMenu();
            }
            
            if (ImGui.MenuItem("Library")) ActivateWindow(new SzLibraryWindow());
            
            ImGui.EndMainMenuBar();
        }
    }
    
}