using Microsoft.Extensions.Logging;

namespace Big.Infrastructure;

/// <summary>
/// One poll tick of the beoordeling-escalation worker (S-14, ADR-0015): acquire the parked
/// <c>BeoordelingEscaleren</c> jobs — the tokens the 14-day boundary timer on <c>Beoordelen</c> spawns
/// — reassign each instance's still-open <c>Beoordelen</c> task to the teamlead, and complete the job.
/// A job that fails is logged and left un-completed so Flowable redelivers it (§8.6). Split out from
/// the hosted pump so the acquire→reassign→complete logic is unit-testable without a running host.
/// </summary>
public sealed class BeoordelingEscalatieProcessor(
    IBeoordelingEscalatieClient client,
    ILogger<BeoordelingEscalatieProcessor> logger)
{
    /// <summary>Acquire and process up to <paramref name="maxJobs"/> escalations. Returns the number acquired.</summary>
    public async Task<int> PumpOnceAsync(int maxJobs, CancellationToken ct = default)
    {
        var jobs = await client.AcquireBeoordelingEscalatieJobsAsync(maxJobs, ct);

        foreach (var job in jobs)
        {
            try
            {
                await client.ReassignBeoordelingToTeamleadAsync(job.ProcessInstanceId, ct);
                await client.CompleteBeoordelingEscalatieJobAsync(job.JobId, ct);
            }
            catch (Exception ex)
            {
                // Leave the job un-completed: its lock expires and Flowable redelivers it (§8.6).
                logger.LogError(ex, "BeoordelingEscaleren job {JobId} failed; leaving it for redelivery.", job.JobId);
            }
        }

        return jobs.Count;
    }
}