using System.Collections.Generic;
using UnityEngine;
#if ENABLE_INPUT_SYSTEM
using UnityEngine.InputSystem;
#endif

public class vDebugUtils : MonoBehaviour
{
    [Tooltip("Enable the debug hotkeys and IMGUI overlay. Keep disabled outside diagnostic sessions to avoid IMGUI overhead.")]
    public bool enableDebugUtility;
    public KeyCode timeScaleDown = KeyCode.KeypadMinus, timeScaleUp = KeyCode.KeypadPlus;
    public float timeScaleChangeValue = 0.1f;
    public bool affectFixedDeltaTime = true;

    float currentFixedDeltaTime;
    List<DebugMessage> debugMessages = new List<DebugMessage>();
    public float displayMessageTime = 5f;
    enum MessageType
    {
        Normal, Warning, Error
    }
    class DebugMessage
    {
        public string message;
        public float startTime;
        public float duration;
        public string timeString;
        public MessageType messageType;
        public DebugMessage(string message, float startTime, float duration, MessageType messageType)
        {
            this.message = message;
            this.startTime = startTime;
            this.messageType = messageType;
            this.duration = duration;
            timeString = System.DateTime.Now.ToString(@"HH\:mm\:ss");
        }
        public bool isAlive => startTime + duration > Time.time;
    }
    private void Awake()
    {
        if (!enableDebugUtility)
        {
            enabled = false;
        }
    }

    private void OnEnable()
    {
        currentFixedDeltaTime = Time.fixedDeltaTime;
    }

    private void Update()
    {
        var scaleDownPressed = false;
        var scaleUpPressed = false;
#if ENABLE_LEGACY_INPUT_MANAGER
        scaleDownPressed = Input.GetKeyDown(timeScaleDown);
        scaleUpPressed = Input.GetKeyDown(timeScaleUp);
#elif ENABLE_INPUT_SYSTEM
        scaleDownPressed = Keyboard.current != null && Keyboard.current.numpadMinusKey.wasPressedThisFrame;
        scaleUpPressed = Keyboard.current != null && Keyboard.current.numpadPlusKey.wasPressedThisFrame;
#endif
        if (scaleDownPressed)
        {
            Time.timeScale = Mathf.Clamp(Time.timeScale - timeScaleChangeValue, 0, 1f);
            if (affectFixedDeltaTime)
            {
                Time.fixedDeltaTime = Time.timeScale * currentFixedDeltaTime;
            }
        }
        else if (scaleUpPressed)
        {
            Time.timeScale = Mathf.Clamp(Time.timeScale + timeScaleChangeValue, 0, 1f);
            if (affectFixedDeltaTime)
            {
                Time.fixedDeltaTime = Time.timeScale * currentFixedDeltaTime;
            }
        }
    }

    public void PrintMessage(string message)
    {
        Debug.Log(message);
        debugMessages.Add(new DebugMessage(message, Time.time, displayMessageTime, MessageType.Normal));
        scrool.y = lastRectPosition;
    }
    public void PrintMessageWarning(string message)
    {
        Debug.LogWarning(message);
        debugMessages.Add(new DebugMessage(message, Time.time, displayMessageTime, MessageType.Warning));
        scrool.y = lastRectPosition;
    }
    public void PrintMessageError(string message)
    {
        Debug.LogError(message);
        debugMessages.Add(new DebugMessage(message, Time.time, displayMessageTime, MessageType.Error));
        scrool.y = lastRectPosition;
    }

    Vector2 scrool;
    GUIStyle messageStyle;
    readonly GUIContent timeScaleContent = new GUIContent();
    float displayedTimeScale = float.NaN;
    float lastRectPosition;
    private void OnGUI()
    {
        if (!Mathf.Approximately(displayedTimeScale, Time.timeScale))
        {
            displayedTimeScale = Time.timeScale;
            timeScaleContent.text = "TimeScale:" + Time.timeScale;
        }
        GUILayout.Label(timeScaleContent);

        if (debugMessages.Count > 0)
        {
            if (messageStyle == null)
            {
                messageStyle = new GUIStyle(GUI.skin.box);
                messageStyle.wordWrap = true;
                messageStyle.alignment = TextAnchor.MiddleLeft;
                messageStyle.fontSize = 10;
            }
            scrool = GUILayout.BeginScrollView(scrool, "box", GUILayout.MinHeight(100), GUILayout.Width(Screen.width * 0.2f), GUILayout.MaxHeight(Screen.height * 0.8f));
            for (int i = 0; i < debugMessages.Count; i++)
            {
                var m = debugMessages[i];
                if (m.isAlive)
                {
                    var t = m.messageType;



                    GUI.color = t == MessageType.Warning ? Color.yellow : t == MessageType.Error ? Color.red : Color.white;

                    GUILayout.Label(string.Format("[{0}] : {1}", m.timeString, m.message), messageStyle);
                    lastRectPosition = GUILayoutUtility.GetLastRect().y;
                }
                else
                {
                    debugMessages.RemoveAt(i);
                    i--;
                }
            }
            GUILayout.EndScrollView();
        }
    }
}