// Cristian Pop - https://boxophobic.com/

using UnityEngine;
using UnityEditor;
using System;

namespace Boxophobic.StyledGUI
{
    public class StyledRemapSliderDrawer : MaterialPropertyDrawer
    {
        public string nameMin = "";
        public string nameMax = "";
        public float min = 0;
        public float max = 0;
        public float top = 0;
        public float down = 0;

        float internalValueMin;
        float internalValueMax;

        bool showAdvancedOptions = false;

        public StyledRemapSliderDrawer(string nameMin, string nameMax, float min, float max)
        {
            this.nameMin = nameMin;
            this.nameMax = nameMax;
            this.min = min;
            this.max = max;
            this.top = 0;
            this.down = 0;
        }

        public StyledRemapSliderDrawer(string nameMin, string nameMax, float min, float max, float top, float down)
        {
            this.nameMin = nameMin;
            this.nameMax = nameMax;
            this.min = min;
            this.max = max;
            this.top = top;
            this.down = down;
        }

        public StyledRemapSliderDrawer()
        {
            this.nameMin = null;
            this.nameMax = null;
            this.min = 0;
            this.max = 1;
            this.top = 0;
            this.down = 0;
        }

        public StyledRemapSliderDrawer(float min, float max)
        {
            this.nameMin = null;
            this.nameMax = null;
            this.min = min;
            this.max = max;
            this.top = 0;
            this.down = 0;
        }

        public StyledRemapSliderDrawer(float min, float max, float top, float down)
        {
            this.nameMin = null;
            this.nameMax = null;
            this.min = min;
            this.max = max;
            this.top = top;
            this.down = down;
        }

        public override void OnGUI(Rect position, MaterialProperty prop, String label, MaterialEditor editor)
        {
            var internalPropMin = MaterialEditor.GetMaterialProperty(editor.targets, nameMin);
            var internalPropMax = MaterialEditor.GetMaterialProperty(editor.targets, nameMax);

            var stylePopupMini = new GUIStyle(EditorStyles.popup)
            {
                fontSize = 9,
            };

            var styleButton = new GUIStyle(EditorStyles.label)
            {

            };

            Vector4 propVector = prop.vectorValue;

            EditorGUI.BeginChangeCheck();

            if (propVector.w == 0)
            {
                internalValueMin = propVector.x;
                internalValueMax = propVector.y;
            }
            else
            {
                internalValueMin = propVector.y;
                internalValueMax = propVector.x;
            }

            GUILayout.Space(top);

            EditorGUI.showMixedValue = prop.hasMixedValue;

            GUILayout.BeginHorizontal();

            if (GUILayout.Button(label, styleButton, GUILayout.Width(EditorGUIUtility.labelWidth), GUILayout.Height(18)))
            {
                showAdvancedOptions = !showAdvancedOptions;
            }

            EditorGUILayout.MinMaxSlider(ref internalValueMin, ref internalValueMax, min, max);

            GUILayout.Space(2);

            propVector.w = (float)EditorGUILayout.Popup((int)propVector.w, new string[] { "Remap", "Invert" }, stylePopupMini, GUILayout.Width(50));

            GUILayout.EndHorizontal();

            if (showAdvancedOptions)
            {
                GUILayout.BeginHorizontal();
                GUILayout.Space(-1);
                GUILayout.Label("      Remap Min", GUILayout.Width(EditorGUIUtility.labelWidth));
                internalValueMin = Mathf.Clamp(EditorGUILayout.Slider(internalValueMin, min, max), min, internalValueMax);
                GUILayout.EndHorizontal();

                GUILayout.BeginHorizontal();
                GUILayout.Space(-1);
                GUILayout.Label("      Remap Max", GUILayout.Width(EditorGUIUtility.labelWidth));
                internalValueMax = Mathf.Clamp(EditorGUILayout.Slider(internalValueMax, min, max), internalValueMin, max);
                GUILayout.EndHorizontal();
            }

            EditorGUI.showMixedValue = false;

            if (EditorGUI.EndChangeCheck())
            {
                if (propVector.w == 0)
                {
                    propVector.x = internalValueMin;
                    propVector.y = internalValueMax;
                }
                else
                {
                    propVector.y = internalValueMin;
                    propVector.x = internalValueMax;
                }

                propVector.z = 1 / (propVector.y - propVector.x);

                prop.vectorValue = propVector;

                if (internalPropMin.displayName != null && internalPropMax.displayName != null)
                {
                    internalPropMin.floatValue = internalValueMin;
                    internalPropMax.floatValue = internalValueMax;
                }
            }

            GUILayout.Space(down);
        }

        public override float GetPropertyHeight(MaterialProperty prop, string label, MaterialEditor editor)
        {
            return -2;
        }
    }
}