using System;
using System.Reflection;
using UnityEngine;

namespace MoreMountains.Tools
{
    public class MMProperty
    {
        public enum MemberTypes { Property, Field }
        public Component TargetComponent;
        public ScriptableObject TargetScriptableObject;
        public MemberTypes MemberType;
        public PropertyInfo MemberPropertyInfo;
        public FieldInfo MemberFieldInfo;
        public Type PropertyType;
        public string MemberName;
        
        public MMProperty(Component targetComponent, MemberTypes type, PropertyInfo propertyInfo, FieldInfo fieldInfo, string memberName, ScriptableObject targetScriptable)
        {
            TargetComponent = targetComponent;
            TargetScriptableObject = targetScriptable;
            MemberType = type;
            MemberPropertyInfo = propertyInfo;
            MemberFieldInfo = fieldInfo;
            MemberName = memberName;
        }
        
        public static MMProperty FindProperty(string propertyName, Component targetComponent, GameObject source, ScriptableObject scriptable)
        {
            FieldInfo fieldInfo = null;
            PropertyInfo propInfo = null;
            MMProperty TargetProperty = null;
            
            if (scriptable == null)
            {
                propInfo = targetComponent.GetType().GetProperty(propertyName);
                if (propInfo == null)
                {
                    fieldInfo = targetComponent.GetType().GetField(propertyName);
                }
            }
            else
            {
                fieldInfo = scriptable.GetType().GetField(propertyName);
            }
            
            if (propInfo != null)
            {
                TargetProperty = new MMProperty(targetComponent, MemberTypes.Property, propInfo, null, propertyName, scriptable);
            }
            if (fieldInfo != null)
            {
                TargetProperty = new MMProperty(targetComponent, MemberTypes.Field, null, fieldInfo, propertyName, scriptable);
            }
            if (propertyName == "")
            {
                if (source != null)
                {
                    Debug.LogError("The MMProperty on " + source.name + " : you need to pick a property from the Property list");
                }
                return null;
            }
            if ((propInfo == null) && (fieldInfo == null))
            {
                if (source != null)
                {
                    Debug.LogError("The MMProperty on " + source.name + " couldn't find any property or field named " + propertyName + " on " + targetComponent.name);
                }                
                return null;
            }

            if (scriptable == null)
            {
                if (TargetProperty.MemberType == MemberTypes.Property)
                {
                    TargetProperty.MemberPropertyInfo = targetComponent.GetType().GetProperty(TargetProperty.MemberName);
                    TargetProperty.PropertyType = TargetProperty.MemberPropertyInfo.PropertyType;
                }
                else if (TargetProperty.MemberType == MemberTypes.Field)
                {
                    TargetProperty.MemberFieldInfo = targetComponent.GetType().GetField(TargetProperty.MemberName);
                    TargetProperty.PropertyType = TargetProperty.MemberFieldInfo.FieldType;
                }
            }
            else
            {
                TargetProperty.MemberFieldInfo = scriptable.GetType().GetField(TargetProperty.MemberName);
                TargetProperty.PropertyType = TargetProperty.MemberFieldInfo.FieldType;
            }                       

            return TargetProperty;
        }
    }
}