using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace Deedy.Activity
{
    public abstract class BasalAction : IActionElement
    {
        protected internal BasalAction() { }
        public string DEClass { get; protected internal set; } = "";
        public string DETitle { get; set; } = "";
        public string DERemark { get; set; } = "";
        public string DEIdentify { get; set; } = "";
        public int DepthLevel { get; protected internal set; } = 0;
        public IElement? ParentElement { get; protected internal set; }
        public IActionViewer? ActionViewer { get; protected internal set; }

        public IElement RootElement => (this.ParentElement == null) ? this : this.ParentElement.RootElement;

        public event PropertyChangedEventHandler? PropertyChanged;

        /// <summary>
        /// 发送属性变更通知
        /// </summary>
        /// <param name="propertyName">发生变更的属性</param>
        protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        /// <summary>
        /// 读取一个字段的值
        /// </summary>
        /// <typeparam name="T">值的类型，可以通过参数进行自动判定</typeparam>
        /// <param name="field">字段的引用【注意：此参数通过引用传递】</param>
        /// <param name="propertyName">属性名称；如果在属性的读取访问器中调用可以自动注入</param>
        /// <returns>字段中的值</returns>
        protected virtual T GetField<T>(ref T field, [CallerMemberName] string? propertyName = null)
        {
            return field;
        }
        /// <summary>
        /// 检查新值是否与原值相等，如果不相等便赋值并发出通知
        /// </summary>
        /// <typeparam name="T">值的类型，可以通过参数进行自动判定</typeparam>
        /// <param name="field">字段的引用【注意：此参数通过引用传递】</param>
        /// <param name="value">字段的新值</param>
        /// <param name="propertyName">要进行变更通知的属性名称；如果在属性的设置访问器中调用可以自动注入</param>
        /// <returns>值是否有变更</returns>
        protected virtual bool SetField<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
        {
            if (EqualityComparer<T>.Default.Equals(field, value)) return false;
            field = value;
            OnPropertyChanged(propertyName);
            return true;
        }

        public void InsertToFore(IElement element)
        {
            throw new NotImplementedException();
        }

        public void InsertAtRear(IElement element)
        {
            throw new NotImplementedException();
        }

        public void SwapIndex(IElement element)
        {
            throw new NotImplementedException();
        }

        public void ReadyToWorking(IElement? element = null, Output? output = null)
        {
            throw new NotImplementedException();
        }
    }
}