using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace ZKLT.Hadoop.Model
{
    /// <summary>
    /// 表
    /// </summary>
    [AttributeUsage(AttributeTargets.Class, Inherited = true)]
    [HDP_Table(Key = "HDP_Table", Description = "表")]
    public class HDP_Table : Attribute
    {
        private string? _Id;

        private string? _SourceId;

        private string? _Key;

        private string? _Description;

        private HDP_Column[]? _Columns;

        /// <summary>
        /// 编号
        /// </summary>
        [HDP_Column(Key = "Id", Description = "编号", Length = 100, DataType = HDP_ColumnDataType.VARCHAR, IsPrimary = true)]
        public string? Id { get => _Id; set => _Id = value; }

        /// <summary>
        /// 源编号
        /// </summary>
        [HDP_Column(Key = "SourceId", Description = "源编号", Length = 100, DataType = HDP_ColumnDataType.VARCHAR)]
        public string? SourceId { get => _SourceId; set => _SourceId = value; }

        /// <summary>
        /// 键
        /// </summary>
        [HDP_Column(Key = "Key", Description = "键", Length = 100, DataType = HDP_ColumnDataType.VARCHAR)]
        public string? Key { get => _Key; set => _Key = value; }

        /// <summary>
        /// 描述
        /// </summary>
        [HDP_Column(Key = "Description", Description = "描述", Length = 200, DataType = HDP_ColumnDataType.VARCHAR)]
        public string? Description { get => _Description; set => _Description = value; }

        /// <summary>
        /// 列
        /// </summary>
        public HDP_Column[]? Columns { get => _Columns; set => _Columns = value; }

        /// <summary>
        /// 类转换Table
        /// </summary>
        /// <typeparam name="T">类型</typeparam>
        /// <returns></returns>
        public static HDP_Table Class2Table<T>()
        {
            Type _type = typeof(T);

            var _tableAttribute = _type.GetCustomAttribute<HDP_Table>();

            if (_tableAttribute == null)
            {
                throw new ArgumentNullException("Table标记不存在");
            }

            if (string.IsNullOrEmpty(_tableAttribute.Key))
            {
                _tableAttribute.Key = _type.Name;
            }

            if (string.IsNullOrEmpty(_tableAttribute.Id))
            {
                _tableAttribute.Id = _tableAttribute.Key;
            }

            var _properties = _type.GetProperties();

            var _columns = new List<HDP_Column>();

            foreach (var _property in _properties)
            {
                var _column = _property.GetCustomAttribute<HDP_Column>();

                if (_column == null)
                {
                    continue;
                }

                if (string.IsNullOrEmpty(_column.TableId))
                {
                    _column.TableId = _tableAttribute.Id;
                }

                if (string.IsNullOrEmpty(_column.Key))
                {
                    _column.Key = _property.Name;
                }

                if (string.IsNullOrEmpty(_column.Id))
                {
                    _column.Id = _column.Key;
                }

                _columns.Add(_column);
            }

            _tableAttribute.Columns = _columns.ToArray();

            return _tableAttribute;
        }

        /// <summary>
        /// 类
        /// </summary>
        /// <param name="data">数据</param>
        /// <returns>字典</returns>
        public static Dictionary<string, object> Class2Dictionary(object data)
        {
            var _result = new Dictionary<string, object>();

            Type _type = data.GetType();

            var _properties = _type.GetProperties();

            foreach (var _property in _properties)
            {
                _result.Add(_property.Name, _property.GetValue(data)!);
            }

            return _result;
        }
    }
}