using FlexJobApi.Core;
using Furion.DatabaseAccessor;
using MediatR;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FlexJobApi.CommonServer.Application
{
    /// <summary>
    /// 保存编号地址
    /// </summary>
    /// <param name="rep"></param>
    public class CodeUrlCommandHandler(
            IRepository<CodeUrl> rep
        ) :
        IRequestHandler<SaveCodeUrlCommand, string>
    {
        private readonly IRepository<CodeUrl> rep = rep;

        /// <summary>
        /// 保存编号地址
        /// </summary>
        /// <param name="request"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<string> Handle(SaveCodeUrlCommand request, CancellationToken cancellationToken)
        {
            var entity = new CodeUrl
            {
                Scene = request.Scene,
                Url = request.Url,
                ExpiredTime = request.ExpiredTime
            };
            await SetCode(entity);
            await rep.InsertAsync(entity);
            return entity.Code;
        }

        private async Task<string> SetCode(CodeUrl entity)
        {
            var now = DateTime.Now;
            entity.Code = $"{StringUtils.GenerateRandomString(5)}";
            var exist = await rep.AnyAsync(it =>
                it.Scene == entity.Scene
                && it.Code == entity.Code
                && (it.ExpiredTime == null
                || it.ExpiredTime > now));
            if (exist)
            {
                await SetCode(entity);
            }
            return entity.Code;
        }
    }
}