using Microsoft.EntityFrameworkCore.Metadata.Builders;
using Microsoft.EntityFrameworkCore.Metadata.Conventions;
using System;
using System.ComponentModel.DataAnnotations;
using System.Linq;

namespace IRaCIS.Core.Test.CodeFirstTest.PGSQL.Migrations
{
    /// <summary>
    /// Efcore 最新支持批量配置字符串类型长度作为保底的    官网参考：https://learn.microsoft.com/zh-cn/ef/core/modeling/bulk-configuration#conventions
    /// </summary>
    public class MaxStringLengthConvention : IModelFinalizingConvention
    {
        public void ProcessModelFinalizing(IConventionModelBuilder modelBuilder, IConventionContext<IConventionModelBuilder> context)
        {
            foreach (var property in modelBuilder.Metadata.GetEntityTypes()
                         .SelectMany(
                             entityType => entityType.GetDeclaredProperties()
                                 .Where(
                                     property => property.ClrType == typeof(string))))
            {

                // 获取 MaxLength 特性
                var maxLengthAttribute = property.PropertyInfo?.GetCustomAttributes(typeof(MaxLengthAttribute), false)
                                       .FirstOrDefault() as MaxLengthAttribute;

                // 获取 StringLength 特性
                var stringLengthAttribute = property.PropertyInfo?.GetCustomAttributes(typeof(StringLengthAttribute), false)
                                          .FirstOrDefault() as StringLengthAttribute;

                // 输出调试信息，看看是哪种特性生效
                if (stringLengthAttribute != null)
                {
                    Console.WriteLine($"{property.Name}: StringLength({stringLengthAttribute.MaximumLength})");
                    property.Builder.HasMaxLength(stringLengthAttribute.MaximumLength);
                }
                else if (maxLengthAttribute != null)
                {
                    Console.WriteLine($"{property.Name}: MaxLength (no specific length, allowing max)");
                }
                else
                {
                    Console.WriteLine($"{property.Name}: Default length 200");
                    property.Builder.HasMaxLength(200);
                }
            }
        }
    }

}