using EnvelopeGenerator.Application.Common.Configurations;
using EnvelopeGenerator.Application.Envelopes.Queries;
using EnvelopeGenerator.Application.Pdf;
using EnvelopeGenerator.Domain.Constants;
using MediatR;
using Microsoft.Extensions.Options;
using Quartz;

namespace EnvelopeGenerator.Finalizer.Job
{
    public class FinishEnvelopeJob : IJob
    {
        private readonly ILogger<FinishEnvelopeJob> _logger;

        private readonly IMediator _mediator;

        private readonly PDFBurnerParams _options;

        public FinishEnvelopeJob(ILogger<FinishEnvelopeJob> logger, IMediator mediator, IOptions<PDFBurnerParams> options)
        {
            _logger = logger;
            _mediator = mediator;
            _options = options.Value;
        }

        public async Task Execute(IJobExecutionContext context)
        {
            var cancel = context.CancellationToken;

            var envelopes = await _mediator.Send(new ReadEnvelopeQuery()
            {
                Status = new() { Include = [ EnvelopeStatus.EnvelopeCompletelySigned ] },
                HasDocResult = false
            }, cancel);

            using var semaphore = new SemaphoreSlim(_options.ConcurrencyLimit);
            await Task.WhenAll(envelopes.Select(async envelope =>
            {
                await semaphore.WaitAsync(cancel);
                try
                {
                    await _mediator.BurnPdf(envelope.Id, cancel);
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, "Error burning envelope {EnvelopeId}", envelope.Id);
                }
                finally
                {
                    semaphore.Release();
                }
            }));

            var envelopeCount = envelopes.Count();
            if (envelopeCount > 0)
            {
                _logger.LogInformation(
                    "Job '{JobName}' executed at {Timestamp}. {EnvelopeCount} envelope(s) successfully finalized. UUID(s): {EnvelopeUuids}",
                    context.JobDetail.Key.Name,
                    context.FireTimeUtc.ToLocalTime(),
                    envelopeCount,
                    string.Join(", ", envelopes.Select(e => e.Uuid))
                );
            }
            else
                _logger.LogInformation("Job '{JobName}' executed successfully at {Timestamp}. No envelopes were finalized.",
                    context.JobDetail.Key.Name,
                    context.FireTimeUtc.ToLocalTime()
                );
        }
    }
}