package fetcher

import (
	"context"
	"log/slog"
	"time"

	"git.avsdev.uk/Go/job-search/internal/config"
	"git.avsdev.uk/Go/job-search/internal/util"
)

// sleepDuration is how long the sleeper's simulated work takes.
const sleepDuration = 60 * time.Second

// runSleeper runs the sleeper test source until ctx is cancelled: every
// configured interval it simulates work by sleeping for sleepDuration.
func runSleeper(
	ctx context.Context,
	logger *slog.Logger,
	conf *config.JSCSourceSleeper,
	since time.Time,
) error {
	blockShutdown := conf.BlockShutdown
	worker := util.Worker{
		Logger:   tagged(logger),
		Name:     "Sleeper",
		Interval: conf.Interval,
		Task: func(taskCtx context.Context, since time.Time) error {
			if blockShutdown {
				return sleep(taskCtx, true, sleepDuration)
			}
			return sleep(ctx, false, sleepDuration)
		},
	}
	return worker.Run(ctx, since)
}

// sleep simulates work taking duration, returning early with ctx.Err() if ctx
// is cancelled. With blockShutdown, the work itself ignores ctx (as a
// non-cooperative call would) and only the wait for it stops.
func sleep(
	ctx context.Context, blockShutdown bool, duration time.Duration,
) error {
	return util.AwaitTaskE(ctx, func() error {
		if blockShutdown {
			time.Sleep(duration)
			return nil
		}

		timer := time.NewTimer(duration)
		defer timer.Stop()

		select {
		case <-timer.C:
			return nil
		case <-ctx.Done():
			return ctx.Err()
		}
	})
}