using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Identity.Data;
using Microsoft.Extensions.DependencyInjection;
using BZPT.Domains.Entity;
using SqlSugar;
using System.Text;

namespace BZPT.Repositories
{
    public static class SqlSugarExt
    {
        public static SqlSugar.DbType ToSugarDbType(this DBProvider dBProvider)
        {
            switch (dBProvider)
            {
                case DBProvider.MySqlClient:
                    return DbType.MySql;
                case DBProvider.SqlClient:
                    return DbType.SqlServer;
                case DBProvider.OracleClient:
                    return DbType.Oracle;
                case DBProvider.PostgreSQL:
                    return DbType.PostgreSQL;
                case DBProvider.SQLite:
                    return DbType.Sqlite;
                default:
                    return DbType.Odbc;
            }
        }

        /// <summary>
        /// 根据指定属性名称对序列进行排序
        /// </summary>
        /// <typeparam name="TSource">source中的元素的类型</typeparam>
        /// <param name="source">一个要排序的值序列</param>
        /// <param name="property">属性名称</param>
        /// <param name="descending">是否降序</param>
        /// <returns></returns>
        public static ISugarQueryable<TEntity> OrderBy<TEntity>(this ISugarQueryable<TEntity> source, IEnumerable<SelectSort<TEntity>> sorts = null) where TEntity : IEntity, new()
        {
            if (sorts != null)
            {
                StringBuilder strOrder = new StringBuilder();
                foreach (var sort in sorts)
                {
                    if(sort.FieldExp==null)
                    {
                        throw new Exception("未指定排序表达式FieldExp，SqlSugar 仓储禁用 FieldName 指定排序字段");
                    }
                    source = source.OrderBy(sort.FieldExp, sort.IsAsc ? OrderByType.Asc : OrderByType.Desc);
                }
            }
            return source;
        }

        /// <summary>
        /// sqlsugar 
        /// </summary>
        /// <param name="service"></param>
        public static void RegisterSqlSugar(IServiceCollection  service)
        {

        }
    }
}