using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using TEAMModelOS.SDK.Context.Attributes.Azure;
using TEAMModelOS.SDK.Context.Exception;

namespace TEAMModelOS.SDK.DI.AzureCosmos.Inner
{
   public static class AzureCosmosUtil
    {
        public static string GetPartitionKey(Type type)
        {
            PropertyInfo[] properties = type.GetProperties();
            List<PropertyInfo> attrProperties = new List<PropertyInfo>();
            foreach (PropertyInfo property in properties)
            {
                if (property.Name.Equals("PartitionKey"))
                {
                    attrProperties.Add(property);
                    break;
                }
                object[] attributes = property.GetCustomAttributes(true);
                foreach (object attribute in attributes) //2.通过映射，找到成员属性上关联的特性类实例，
                {
                    if (attribute is PartitionKeyAttribute)
                    {
                        attrProperties.Add(property);
                    }
                }
            }
            if (attrProperties.Count <= 0)
            {
                throw new BizException(type.Name + " has no PartitionKey !");
            }
            else
            {
                if (attrProperties.Count == 1)
                {
                    return attrProperties[0].Name;
                }
                else { throw new BizException(type.Name + " PartitionKey can only be single!"); }
            }
        }
    }
}