using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.Mvc.Filters;
using SqlSugar;
using System.Linq;
using System.Threading.Tasks;

namespace Myshipping.Core;

/// <summary>
/// SqlSugar 工作单元拦截器
/// </summary>
public class SqlSugarUnitOfWorkFilter : IAsyncActionFilter, IOrderedFilter
{
    /// <summary>
    /// 过滤器排序
    /// </summary>
    internal const int FilterOrder = 9999;

    /// <summary>
    /// 排序属性
    /// </summary>
    public int Order => FilterOrder;

    /// <summary>
    /// SqlSugar 对象
    /// </summary>
    private readonly SqlSugarScope _sqlSugarClient;

    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="sqlSugarClient"></param>

    public SqlSugarUnitOfWorkFilter(ISqlSugarClient sqlSugarClient)
    {
        _sqlSugarClient = (SqlSugarScope)sqlSugarClient;
    }

    /// <summary>
    ///
    /// </summary>
    /// <param name="context"></param>
    /// <param name="next"></param>
    /// <returns></returns>
    public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
    {
        // 获取动作方法描述器
        var actionDescriptor = context.ActionDescriptor as ControllerActionDescriptor;
        var method = actionDescriptor.MethodInfo;

        // 判断是否贴有工作单元特性
        if (!method.IsDefined(typeof(SqlSugarUnitOfWorkAttribute), true))
        {
            // 调用方法
            _ = await next();
        }
        else
        {
            var attribute = (method.GetCustomAttributes(typeof(SqlSugarUnitOfWorkAttribute), true).FirstOrDefault() as SqlSugarUnitOfWorkAttribute);

            // 开启事务
            _sqlSugarClient.Ado.BeginTran(attribute.IsolationLevel);

            // 调用方法
            var resultContext = await next();

            if (resultContext.Exception == null)
            {
                try
                {
                    _sqlSugarClient.Ado.CommitTran();
                }
                catch
                {
                    _sqlSugarClient.Ado.RollbackTran();
                }
                finally
                {
                    _sqlSugarClient.Ado.Dispose();
                }
            }
            else
            {
                // 回滚事务
                _sqlSugarClient.Ado.RollbackTran();
                _sqlSugarClient.Ado.Dispose();
            }
        }
    }
}