using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using UnityEngine.UI;

public class TimeScaleWindow : EditorWindow
{

    // Add menu named "My Window" to the Window menu

    private int weightedTimeScale = 1;
    private bool isPaused = false;
    private Color defaultColor;

    [MenuItem("Tools/TimeScale")]
    static void Init()
    {
        // Get existing open window or if none, make a new one:
        TimeScaleWindow window = (TimeScaleWindow)EditorWindow.GetWindow(typeof(TimeScaleWindow),false,"Time Scale");


        Rect rect = window.position;
        rect.width = 300;
        rect.height = EditorGUIUtility.singleLineHeight * 4;
        window.minSize = new Vector2(rect.width, rect.height);
        window.maxSize = new Vector2(rect.width, rect.height);
        window.position = rect;

        window.Show();
    }

    void OnGUI()
    {
        GUILayout.BeginHorizontal();

        if (GUILayout.Button("<<")) NextPower(-1);
        if (GUILayout.Button("<")) weightedTimeScale--;

        if (GUILayout.Button(">")) weightedTimeScale++;
        if (GUILayout.Button(">>")) NextPower(1);

        GUILayout.EndHorizontal();
        weightedTimeScale = (int)GUILayout.HorizontalSlider(weightedTimeScale, -98f, 100f);
        weightedTimeScale = Mathf.Clamp(weightedTimeScale,-98,100);
        GUILayout.Space(EditorGUIUtility.singleLineHeight);

        GUILayout.BeginHorizontal();

        if (GUILayout.Button("Pause")) isPaused = true;
        var centeredStyle = new GUIStyle(EditorStyles.label);
        centeredStyle.alignment = TextAnchor.UpperCenter;
        centeredStyle.normal.textColor = EditorStyles.label.normal.textColor;

        if (isPaused)
            centeredStyle.normal.textColor = Color.red;

        GUILayout.Label(DisplayString(weightedTimeScale), centeredStyle);

        if (GUILayout.Button("Play")) isPaused = false;
        GUILayout.EndHorizontal();

        Time.timeScale = ConvertWeightedToRaw(weightedTimeScale);

    }

    private float ConvertWeightedToRaw(float input)
    {
        if (isPaused)
            return 0;

        if (input >= 1)
            return Mathf.Lerp(0, 100, input / 100);
        else
            return 1 / (-input + 2);
    }



    private void NextPower(int dir)
    {
        int sign = (int)Mathf.Sign(weightedTimeScale - 1);
        int prevValue = (sign >= 0) ? Mathf.Abs(weightedTimeScale) : Mathf.Abs(weightedTimeScale) + 2;
        int nextValue = Mathf.NextPowerOfTwo(prevValue);

        if (weightedTimeScale == 0)
        {
            weightedTimeScale = 1;
            if (dir < 0)
                weightedTimeScale = -2;
            return;
        }


        if (Mathf.Sign(dir) != Mathf.Sign(weightedTimeScale))
            nextValue /= 2;
        else if (prevValue == nextValue)
            nextValue = Mathf.NextPowerOfTwo(prevValue + 1);

        if (sign <= 0)
            nextValue -= 2;

        weightedTimeScale = nextValue * sign;
    }

    private string DisplayString(float input)
    {
        string retVal = "";

        if (isPaused)
            retVal += "(Paused) ";
        if (input > 0)
            retVal += input.ToString();
        else
            retVal += "1/" + (-input + 2);

        return retVal;
    }

}