using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace Ant.ORM
{
    public class DataFieldMeta
    {
        PropertyInfo pinfo;
        FiledMetaData md;
        /// <summary>
        /// 
        /// </summary>
        public DataFieldMeta(PropertyInfo info, FiledMetaData data)
        {
            pinfo = info;
            md = data;
        }

        /// <summary>
        /// 获取属性值
        /// </summary>
        /// <returns></returns>
        public FiledMetaData GetAllMetaData()
        {
            GetDataFieldMeta();
            GetReferenceMeta();
            GetChildMeta();
            return md;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        public void GetDataFieldMeta()
        {
            ///也能实现两种写法
            // if (pinfo.IsDefined(typeof(DataFieldColumnAttribute), false))
            //{
            //    var dfa = (DataFieldColumnAttribute)pinfo.GetCustomAttributes(typeof(DataFieldColumnAttribute), false)[0];
            
            DataFieldColumnAttribute dfa = Attribute.GetCustomAttribute(pinfo, typeof(DataFieldColumnAttribute)) as DataFieldColumnAttribute;
            if (dfa.IfNotNull())
            {
                DataFieldMetaData dfMetaData = new DataFieldMetaData();
                dfMetaData.ColumnName = dfa.Name;
                dfMetaData.ColumnType = dfa.DbType;
                dfMetaData.DefaultValue = dfa.DefaultValue;
                dfMetaData.IsPrimaryKey = dfa.IsPrimaryKey;
                dfMetaData.IsForeignKey = dfa.IsForeignKey;
                dfMetaData.IsNullable = dfa.IsNullable;
                dfMetaData.IsAutoincrement = dfa.IsAutoincrement;
                dfMetaData.PropertyName = pinfo.Name;
                dfMetaData.PropertyType = pinfo.PropertyType;
                //md.FieldMeteDatas.Add(pinfo.Name, dfMetaData);
                //if (dfa.IsPrimaryKey && string.IsNullOrEmpty(md.PrimaryKey))
                //    md.PrimaryKey = pinfo.Name;
            }
        }

        /// <summary>
        /// 获取扩展属性
        /// </summary>
        /// <returns></returns>
        public void GetReferenceMeta()
        {
            ReferenceAttribute dfa = Attribute.GetCustomAttribute(pinfo, typeof(ReferenceAttribute)) as ReferenceAttribute;
            if (dfa.IfNotNull())
            {
                ReferenceMataData f = new ReferenceMataData();
                f.Key = dfa.Key;
                f.DataType = dfa.DataType;
                f.ForeignKey = dfa.ForeignKey;
                f.ForeignTable = dfa.ForeignTable;
                f.MainKey = dfa.MainKey;
                f.ShowField = dfa.ShowField;
                //md.ReferenceObjects.Add(f.Key, f);
            }
        }

        /// <summary>
        /// 获取关联对象
        /// </summary>
        /// <returns></returns>
        public void GetChildMeta()
        {
            ChildAttribute dfa = Attribute.GetCustomAttribute(pinfo, typeof(ChildAttribute)) as ChildAttribute;
            if (dfa.IfNotNull())
            {
                //关联对象
                ChildMataData cf = new ChildMataData();
                //if (md.ChildObjects.ContainsKey(dfa.Key))
                //{
                //    cf = md.ChildObjects[dfa.Key];
                //    cf.ShowField.Add(dfa.ShowField);
                //}
                //else
                //{
                //    cf.MainTable = dfa.MainTable;
                //    cf.DataType = dfa.DataType;
                //    cf.ParentTableFields = dfa.ParentTableFields;
                //    cf.ChildTableFields = dfa.ChildTableFields;
                //    cf.ChildTable = dfa.ChildTable;
                //    cf.Key = dfa.Key;
                //    cf.ShowField.Add(dfa.ShowField);
                //}
                //md.ChildObjects.Add(cf.Key, cf);
            }
        }

    }
}