import {
  getStdout,
  type Mapper,
  memoize,
  Either,
  ErrorSource,
  type IActivity,
  type IEither,
  type ITraceable,
  jsonModel,
  JsonResponse,
  LogLevel,
  Metric,
  PenguenoError,
  type PenguenoRequest,
  type ServerTrace,
  TraceUtil,
  validateExecutionEntries,
} from "@emprespresso/pengueno";
import { isJob, type Job } from "@emprespresso/ci_model";

// -- <job.hook> --
const wellFormedJobMetric = Metric.fromName("Job.WellFormed");

const jobJsonTransformer = (
  j: ITraceable<unknown, ServerTrace>,
): IEither<PenguenoError, Job> =>
  j
    .bimap(TraceUtil.withMetricTrace(wellFormedJobMetric))
    .map((tJson) => {
      if (!isJob(tJson) || !validateExecutionEntries(tJson)) {
        const err = "seems like a pwetty mawfomed job \\(-.-)/";
        tJson.trace.addTrace(LogLevel.WARN).trace(err);
        return Either.left<PenguenoError, Job>(new PenguenoError(err, 400));
      }
      return Either.right<PenguenoError, Job>(tJson);
    })
    .peek((tJob) =>
      tJob.trace.trace(
        tJob
          .get()
          .fold((err) =>
            err ? wellFormedJobMetric.failure : wellFormedJobMetric.success,
          ),
      ),
    )
    .get();

export interface IJobHookActivity {
  processHook: IActivity;
}

const jobHookRequestMetric = Metric.fromName("JobHook.process");
export class JobHookActivityImpl implements IJobHookActivity {
  constructor(
    private readonly queuer: IJobQueuer<ITraceable<Job, ServerTrace>>,
  ) {}

  private trace(r: ITraceable<PenguenoRequest, ServerTrace>) {
    return r
      .bimap(TraceUtil.withClassTrace(this))
      .bimap(TraceUtil.withMetricTrace(jobHookRequestMetric));
  }

  public processHook(r: ITraceable<PenguenoRequest, ServerTrace>) {
    return this.trace(r)
      .map(jsonModel(jobJsonTransformer))
      .map(async (tEitherJobJson) => {
        const eitherJob = await tEitherJobJson.get();
        return eitherJob.flatMapAsync(async (job) => {
          const eitherQueued = await tEitherJobJson
            .move(job)
            .map(this.queuer.queue)
            .get();
          return eitherQueued.mapLeft((e) => new PenguenoError(e.message, 500));
        });
      })
      .peek(
        TraceUtil.promiseify((tJob) =>
          tJob
            .get()
            .fold(
              (err: PenguenoError | undefined, _val: string | undefined) => {
                if (!err) {
                  tJob.trace.trace(jobHookRequestMetric.success);
                  tJob.trace.trace(
                    `all queued up and weady to go :D !! ${_val}`,
                  );
                  return;
                }
                tJob.trace.trace(
                  err.source === ErrorSource.SYSTEM
                    ? jobHookRequestMetric.failure
                    : jobHookRequestMetric.warn,
                );
                tJob.trace.addTrace(err.source).trace(`${err}`);
              },
            ),
        ),
      )
      .map(
        TraceUtil.promiseify(
          (tEitherQueuedJob) =>
            new JsonResponse(r, tEitherQueuedJob.get(), {
              status: tEitherQueuedJob
                .get()
                .fold((err, _val) => (_val ? 200 : err?.status ?? 500)),
            }),
        ),
      )
      .get();
  }
}

// -- </job.hook> --

// -- <job.queuer> --
type QueuePosition = string;
export class QueueError extends Error {}
export interface IJobQueuer<TJob> {
  queue: Mapper<TJob, Promise<IEither<QueueError, QueuePosition>>>;
}

export class LaminarJobQueuer
  implements IJobQueuer<ITraceable<Job, ServerTrace>>
{
  constructor(private readonly queuePositionPrefix: string) {}

  private static GetJobTypeTrace = (jobType: string) =>
    `LaminarJobQueue.Queue.${jobType}`;
  private static JobTypeMetrics = memoize((jobType: string) =>
    Metric.fromName(LaminarJobQueuer.GetJobTypeTrace(jobType)),
  );

  public queue(j: ITraceable<Job, ServerTrace>) {
    const { type: jobType } = j.get();
    const trace = LaminarJobQueuer.GetJobTypeTrace(jobType);
    const metric = LaminarJobQueuer.JobTypeMetrics(trace);

    return j
      .bimap(TraceUtil.withTrace(trace))
      .bimap(TraceUtil.withMetricTrace(metric))
      .map((j) => {
        const { type: jobType, arguments: args } = j.get();
        const laminarCommand = [
          "laminarc",
          "queue",
          jobType,
          ...Object.entries(args).map(([key, val]) => `"${key}"="${val}"`),
        ];
        return laminarCommand;
      })
      .peek((c) =>
        c.trace.trace(
          `im so excited to see how this queue job will end!! (>ᴗ<): ${c
            .get()
            .toString()}`,
        ),
      )
      .map(getStdout)
      .peek(
        TraceUtil.promiseify((q) =>
          q.trace.trace(
            q
              .get()
              .fold((err, _val) => (err ? metric.failure : metric.success)),
          ),
        ),
      )
      .map(
        TraceUtil.promiseify((q) =>
          q
            .get()
            .mapRight((stdout) => {
              q.trace.addTrace(LogLevel.DEBUG).trace(`stdout ${stdout}`);
              const [jobName, jobId] = stdout.split(":");
              const jobUrl = `${this.queuePositionPrefix}/jobs/${jobName}/${jobId}`;

              q.trace.trace(
                `all queued up and weady to go~ (˘ω˘) => ${jobUrl}`,
              );
              return jobUrl;
            })
            .mapLeft((err) => {
              q.trace.addTrace(LogLevel.ERROR).trace(err.toString());
              return err;
            }),
        ),
      )
      .get();
  }
}
// -- </job.queuer> --