using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace YD_Event.Application.Event;

/// <summary>
/// 支付超时处理后台服务
/// </summary>
public class PaymentExpirationBackgroundService : BackgroundService
{
    private readonly IServiceProvider _serviceProvider;
    private readonly ILogger<PaymentExpirationBackgroundService> _logger;
    private readonly PeriodicTimer _timer;

    public PaymentExpirationBackgroundService(
        IServiceProvider serviceProvider,
        ILogger<PaymentExpirationBackgroundService> logger)
    {
        _serviceProvider = serviceProvider;
        _logger = logger;
        _timer = new PeriodicTimer(TimeSpan.FromMinutes(5));
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        _logger.LogInformation("支付超时处理后台服务已启动");

        try
        {
            while (await _timer.WaitForNextTickAsync(stoppingToken))
            {
                await ProcessExpiredPaymentsAsync(stoppingToken);
            }
        }
        catch (OperationCanceledException)
        {
            _logger.LogInformation("支付超时处理后台服务已停止");
        }
    }

    private async Task ProcessExpiredPaymentsAsync(CancellationToken stoppingToken)
    {
        try
        {
            _logger.LogInformation("开始处理超时未支付订单");

            using var scope = _serviceProvider.CreateScope();
            var registrationRepository = scope.ServiceProvider.GetRequiredService<ISqlSugarRepository<EventRegistration>>();
            var orderRepository = scope.ServiceProvider.GetRequiredService<ISqlSugarRepository<YD_Event.Core.Entities.Order>>();

            var now = DateTime.Now;
            var expirationTime = now.AddMinutes(-30);

            var expiredRegistrations = await registrationRepository.AsQueryable()
                .Where(x => x.PaymentMethod == 2 
                    && x.PaymentStatus == 0 
                    && x.CreatedTime <= expirationTime
                    && !x.DeleteMark)
                .ToListAsync(stoppingToken);

            if (expiredRegistrations.Any())
            {
                _logger.LogInformation("发现 {Count} 个超时未支付的线上订单", expiredRegistrations.Count);

                var idsToCancel = expiredRegistrations.Select(x => x.Id).ToList();
                var orderNos = expiredRegistrations.Where(x => !string.IsNullOrEmpty(x.OrderNo)).Select(x => x.OrderNo).ToList();

                await registrationRepository.UpdateAsync(x => new EventRegistration
                {
                    PaymentStatus = 4,
                    UpdatedTime = now
                }, x => idsToCancel.Contains(x.Id));

                if (orderNos.Any())
                {
                    await orderRepository.UpdateAsync(x => new YD_Event.Core.Entities.Order
                    {
                        OrderStatus = OrderStatus.Cancelled,
                        UpdatedTime = now
                    }, x => orderNos.Contains(x.OrderNo));
                }

                _logger.LogInformation("已成功取消 {Count} 个超时未支付订单", expiredRegistrations.Count);
            }
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "处理超时未支付订单时发生错误");
        }
    }

    public override void Dispose()
    {
        _timer.Dispose();
        base.Dispose();
    }
}