using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEditor;
using UnityEngine;

namespace TheraBytes.BetterUi.Editor
{
    public class ImageAppearanceProviderEditorHelper
    {
        static readonly string DEFAULT = "Default";
        static readonly string CUSTOM = "Custom";

        SerializedObject serializedObject;
        IImageAppearanceProvider img;

        private SerializedProperty materialProperty1, materialProperty2, materialProperty3;
        private SerializedProperty propMatType, propEffType;
        
        string[] materials;
        int materialIndex, materialEffectIndex;

        public ImageAppearanceProviderEditorHelper(SerializedObject serializedObject, IImageAppearanceProvider img)
        {
            this.serializedObject = serializedObject;
            this.img = img;

            this.materialProperty1 = serializedObject.FindProperty("materialProperty1");
            this.materialProperty2 = serializedObject.FindProperty("materialProperty2");
            this.materialProperty3 = serializedObject.FindProperty("materialProperty3");

            propMatType = serializedObject.FindProperty("materialType");
            propEffType = serializedObject.FindProperty("materialEffect");


            List<string> materialOptions = new List<string>();
            materialOptions.Add(DEFAULT);
            materialOptions.AddRange(Materials.Instance.GetAllMaterialNames());
            materialOptions.Add(CUSTOM);
            materials = materialOptions.ToArray();

            materialIndex = materialOptions.IndexOf(img.MaterialType);
            if (materialIndex < 0)
                materialIndex = 0;

            var effectOptions = Materials.Instance.GetAllMaterialEffects(img.MaterialType).ToList();
            materialEffectIndex = effectOptions.IndexOf(img.MaterialEffect);
            if (materialEffectIndex < 0)
                materialEffectIndex = 0;
        }

        public void DrawMaterialGui(SerializedProperty materialProp)
        {

            // MATERIAL
            materialIndex = EditorGUILayout.Popup("Material", materialIndex, materials);
            string materialType = materials[materialIndex];

            MaterialEffect effect;
            if (materialType == CUSTOM || materialType == DEFAULT)
            {
                effect = MaterialEffect.Normal;
            }
            else
            {
                var options = Materials.Instance.GetAllMaterialEffects(materialType).Select(o => o.ToString()).ToArray();
                materialEffectIndex = EditorGUILayout.Popup("Effect", materialEffectIndex, options);
                if (materialEffectIndex >= options.Length)
                    materialEffectIndex = 0;

                effect = (MaterialEffect)Enum.Parse(typeof(MaterialEffect), options[materialEffectIndex]);
            }


            var materialInfo = Materials.Instance.GetMaterialInfo(materialType, effect);
            var material = (materialInfo != null) ? materialInfo.Material : null;
            var propVars = serializedObject.FindProperty("materialProperties");

            // material type changed
            bool materialChanged = propMatType.stringValue != materialType;
            bool effectChanged = propEffType.enumValueIndex != (int)effect;
            if (materialChanged || effectChanged)
            {
                propMatType.stringValue = materialType;
                materialProp.objectReferenceValue = material;

                propEffType.enumValueIndex = (int)effect;

                int infoIdx = Materials.Instance.GetMaterialInfoIndex(materialType, effect);
                if (infoIdx >= 0)
                {
                    SerializedObject obj = new SerializedObject(Materials.Instance);
                    var source = obj.FindProperty("materials")
                        .GetArrayElementAtIndex(infoIdx)
                        .FindPropertyRelative("Properties");

                    SerializedPropertyUtil.Copy(source, propVars);
                    propVars = serializedObject.FindProperty("materialProperties");
                    serializedObject.ApplyModifiedPropertiesWithoutUndo();

                    // update material properties
                    var floats = propVars.FindPropertyRelative("FloatProperties");
                    if (floats != null)
                    {
                        for (int i = 0; i < floats.arraySize; i++)
                        {
                            var p = floats.GetArrayElementAtIndex(i);
                            SerializedProperty innerProp = p.FindPropertyRelative("Value");
                            if (innerProp == null)
                                continue;

                            SerializedProperty valProp;
                            switch (i)
                            {
                                case 0: valProp = materialProperty1; break;
                                case 1: valProp = materialProperty2; break;
                                case 2: valProp = materialProperty3; break;
                                default: throw new ArgumentOutOfRangeException();
                            }

                            if (materialChanged)
                                valProp.floatValue = innerProp.floatValue;
                            else if (effectChanged)
                                innerProp.floatValue = valProp.floatValue;
                        }
                    }
                }
                serializedObject.ApplyModifiedPropertiesWithoutUndo();
            }

            if (materialType == CUSTOM)
            {
                EditorGUILayout.PropertyField(materialProp, new GUILayoutOption[0]);
            }
            else if (materialType != DEFAULT)
            {
                var floats = propVars.FindPropertyRelative("FloatProperties");
                if (floats != null)
                {
                    for (int i = 0; i < floats.arraySize; i++)
                    {
                        var f = img.MaterialProperties.FloatProperties[i];
                        var p = floats.GetArrayElementAtIndex(i);
                        string displayName = p.FindPropertyRelative("Name").stringValue;

                        SerializedProperty valProp;
                        switch (i)
                        {
                            case 0: valProp = materialProperty1; break;
                            case 1: valProp = materialProperty2; break;
                            case 2: valProp = materialProperty3; break;
                            default: throw new ArgumentOutOfRangeException();
                        }

                        if (f.IsRestricted)
                        {
                            EditorGUILayout.Slider(valProp, f.Min, f.Max, displayName);
                        }
                        else
                        {
                            EditorGUILayout.PropertyField(valProp, new GUIContent(displayName));
                        }

                        SerializedProperty innerProp = p.FindPropertyRelative("Value");
                        innerProp.floatValue = valProp.floatValue;
                    }
                }

            }

            if (materialType == CUSTOM && materialProp.objectReferenceValue != null)
            {
                bool isOrig = !(materialProp.objectReferenceValue.name.EndsWith("(Clone)")); // TODO: find better check
                EditorGUILayout.BeginHorizontal(new GUILayoutOption[0]);

                GUILayout.Label((isOrig) ? "Material: SHARED" : "Material: CLONED",
                    GUILayout.Width(EditorGUIUtility.labelWidth));

                if (GUILayout.Button((isOrig) ? "Clone" : "Remove",
                    EditorStyles.miniButton, new GUILayoutOption[0]))
                {
                    materialProp.objectReferenceValue = (isOrig)
                        ? Material.Instantiate(img.material)
                        : null;

                    img.SetMaterialDirty();
                }

                EditorGUILayout.EndHorizontal();
            }

        }

        public static void DrawColorGui(SerializedProperty colorMode, SerializedProperty firstColor, SerializedProperty secondColor)
        {
            // COLOR
            EditorGUILayout.PropertyField(colorMode);

            EditorGUILayout.BeginHorizontal();
            EditorGUILayout.BeginVertical();

            EditorGUILayout.PropertyField(firstColor, new GUILayoutOption[0]);

            var mode = (ColorMode)colorMode.intValue;
            if (mode != ColorMode.Color)
            {
                EditorGUILayout.PropertyField(secondColor);
            }

            EditorGUILayout.EndVertical();
            if (mode != ColorMode.Color)
            {
                if (GUILayout.Button("↕",
                    GUILayout.Width(25), GUILayout.Height(2 * EditorGUIUtility.singleLineHeight)))
                {
                    Color a = firstColor.colorValue;
                    firstColor.colorValue = secondColor.colorValue;
                    secondColor.colorValue = a;
                }
            }
            EditorGUILayout.EndHorizontal();

            EditorGUILayout.Separator();
        }
    }
}