using System;
using RebootKit.Engine.Main;
using RebootKit.Engine.UI;
using UnityEngine;
using UnityEngine.UIElements;

namespace RebootKit.Engine.Services.Development {
    public class DebugOverlayView : UIDocumentView {
        const string k_DebugLabelClassName = "rr__debug-label";
        
        VisualElement m_RootElement;
        
        Label m_FPSLabel;
        Label m_GameModeLabel;

        void Update() {
            if (m_RootElement == null) {
                return;
            }

            Resolution resolution = Screen.currentResolution;
            m_FPSLabel.text = $"fps: {Mathf.RoundToInt(1f / Time.deltaTime)} | dt: {Time.deltaTime:F4}ms | runtime: {Time.time:F4}s | resolution: {resolution.width}x{resolution.height}@{resolution.refreshRateRatio}Hz";
            m_GameModeLabel.text = RR.GameModes.ActiveGameMode.CurrentValue != null
                ? $"Game Mode: {RR.GameModes.ActiveGameMode.CurrentValue.GetType().Name}"
                : "Game Mode: none";
        }

        public override VisualElement Build() {
            m_RootElement = new VisualElement();
            
            CreateLabel($"Toggle Overlay [F3] | RebootKit | game: {Application.productName}, version: {Application.version}");
            m_FPSLabel = CreateLabel($"FPS: {Application.targetFrameRate}");
            
            m_GameModeLabel = CreateLabel("Game Mode: none");
            return m_RootElement;
        }

        Label CreateLabel(string text) {
            Label label = (Label)LabelBuilder.New(text).Build();
            label.AddToClassList(k_DebugLabelClassName);

            m_RootElement.Add(label);
            return label;
        }
    }
}