using System.Diagnostics;
using Microsoft.Extensions.Logging;
using SeaHaven.DataServices.Interfaces;
using SeaHaven.Services.DTOs;
using SeaHaven.Services.Interfaces;

namespace SeaHaven.Services.Implementation
{
    public class PastDueCacheService : IPastDueCacheService
    {
        private readonly IWorkOrderDomainJobDataService _dataService;
        private readonly ILogger<PastDueCacheService> _logger;

        public PastDueCacheService(
            IWorkOrderDomainJobDataService dataService,
            ILogger<PastDueCacheService> logger)
        {
            _dataService = dataService;
            _logger = logger;
        }

        public async Task<PastDueCacheJobResult> RefreshAsync(CancellationToken cancellationToken = default)
        {
            var stopwatch = Stopwatch.StartNew();
            var utcNow = DateTime.UtcNow;

            _logger.LogInformation("PastDue cache refresh started at {UtcNow}", utcNow);

            var refreshResult = await _dataService.RefreshPastDueFlagsAsync(utcNow, cancellationToken: cancellationToken);

            stopwatch.Stop();

            var result = new PastDueCacheJobResult
            {
                SetCount = refreshResult.SetCount,
                ClearedCount = refreshResult.ClearedCount,
                ExaminedCount = refreshResult.ExaminedCount,
                DurationMs = stopwatch.ElapsedMilliseconds
            };

            _logger.LogInformation(
                "PastDue cache refresh completed. Set={SetCount}, Cleared={ClearedCount}, Examined={ExaminedCount}, DurationMs={DurationMs}",
                result.SetCount, result.ClearedCount, result.ExaminedCount, result.DurationMs);

            return result;
        }
    }
}