using Magicodes.ExporterAndImporter.Core;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.IdentityModel.Tokens;
using System.Reflection;

namespace Wood.Service
{
    public static class ValidationHelper
    {
        public static List<string> ValidateDataLength<T>(IList<T> dataList, DbContext dbContext) where T : class
        {
            var errors = new List<string>();
            var entityType = dbContext.Model.FindEntityType(typeof(T));
            int rowNum = 1;
            foreach (var data in dataList)
            {
                foreach (var property in entityType.GetProperties())
                {
                    var maxLength = property.GetMaxLength();
                    if (maxLength > 0 && property.ClrType == typeof(string))
                    {
                        var value = property.PropertyInfo.GetValue(data) as string;


                        if (!string.IsNullOrEmpty(value) && value.Length > maxLength)
                        {
                            string title = property.GetImporterHeader();
                            errors.Add($"第{rowNum}行数据错误：字段 {(title.IsNullOrEmpty() ? property.Name : title)} 的长度超过限制 ({value.Length} > {maxLength})");
                        }
                    }
                }
                rowNum++;
            }

            return errors;
        }
    }

    public static class PropertyExtension
    {
        public static string GetImporterHeader(this IProperty value)
        {
            string ret = value?.PropertyInfo?.GetCustomAttribute<ImporterHeaderAttribute>()?.Name;
            return ret;
        }
    }

}