using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using UnityEngine;
using UnityEngine.UI;
using UnityExplorer.Helpers;
using UnityExplorer.UI;
using UnityExplorer.UI.Shared;

namespace UnityExplorer.Inspectors.Reflection
{
    public class InteractiveValue
    {
        public CacheObjectBase OwnerCacheObject;

        public object Value { get; set; }
        public Type ValueType;

        public string ButtonLabel => m_btnLabel ?? GetButtonLabel();
        private string m_btnLabel;

        public MethodInfo ToStringMethod => m_toStringMethod ?? GetToStringMethod();
        private MethodInfo m_toStringMethod;

        public virtual void Init()
        {
            UpdateValue();
        }

        public virtual void UpdateValue()
        {
            if (!m_text)
                return;

            if (OwnerCacheObject is CacheMember ownerMember && !string.IsNullOrEmpty(ownerMember.ReflectionException))
            {
                m_text.text = "<color=red>" + ownerMember.ReflectionException + "</color>";
                return;
            }

            if (Value == null)
            {
                m_text.text = "<color=red>null</color>";
            }
            else
            {
                GetButtonLabel();
                m_text.text = ButtonLabel;
            }
        }

        private MethodInfo GetToStringMethod()
        {
            try
            {
                m_toStringMethod = ReflectionHelpers.GetActualType(Value).GetMethod("ToString", new Type[0])
                                   ?? typeof(object).GetMethod("ToString", new Type[0]);

                // test invoke
                m_toStringMethod.Invoke(Value, null);
            }
            catch
            {
                m_toStringMethod = typeof(object).GetMethod("ToString", new Type[0]);
            }
            return m_toStringMethod;
        }

        public string GetButtonLabel()
        {
            if (Value == null) return "";

            var valueType = ReflectionHelpers.GetActualType(Value);

            string label;

            if (valueType == typeof(TextAsset))
            {
                var textAsset = Value as TextAsset;

                label = textAsset.text;

                if (label.Length > 10)
                {
                    label = $"{label.Substring(0, 10)}...";
                }

                label = $"\"{label}\" {textAsset.name} (<color={SyntaxColors.Class_Instance}>UnityEngine.TextAsset</color>)";
            }
            else
            {
                label = (string)ToStringMethod?.Invoke(Value, null) ?? Value.ToString();

                var classColor = valueType.IsAbstract && valueType.IsSealed
                    ? SyntaxColors.Class_Static
                    : SyntaxColors.Class_Instance;

                string typeLabel = $"<color={classColor}>{valueType.FullName}</color>";

                if (Value is UnityEngine.Object)
                {
                    label = label.Replace($"({valueType.FullName})", $"({typeLabel})");
                }
                else
                {
                    if (!label.Contains(valueType.FullName))
                    {
                        label += $" ({typeLabel})";
                    }
                    else
                    {
                        label = label.Replace(valueType.FullName, typeLabel);
                    }
                }
            }

            return m_btnLabel = label;
        }

        #region UI CONSTRUCTION

        internal GameObject m_UIContent;
        internal Text m_text;

        public void ConstructUI(GameObject parent)
        {
            // TEMPORARY
            m_UIContent = UIFactory.CreateLabel(parent, TextAnchor.MiddleLeft);
            var mainLayout = m_UIContent.AddComponent<LayoutElement>();
            mainLayout.minWidth = 100;
            mainLayout.flexibleWidth = 5000;
            mainLayout.minHeight = 25;
            m_text = m_UIContent.GetComponent<Text>();
            
            if (OwnerCacheObject != null)
            {
                if (!OwnerCacheObject.HasEvaluated)
                {
                    m_text.text = "Not yet evaluated";
                }
                else
                {
                    m_text.text = ButtonLabel;
                }
            }
        }

        #endregion
    }
}