package worker

import (
	"context"
	"time"

	"github.com/prabhupadasays/spsays-bff/internal/service"
	"go.uber.org/zap"
)

// ReminderWorker ticks every reminderInterval and asks the ReminderService to
// fire any sādhana reminders due at that moment (in each user's local time).
// The window inside the service is wider than this interval, so no target
// time slips between ticks.
type ReminderWorker struct {
	svc    *service.ReminderService
	logger *zap.Logger
}

const reminderInterval = 15 * time.Minute

func NewReminderWorker(svc *service.ReminderService, logger *zap.Logger) *ReminderWorker {
	return &ReminderWorker{svc: svc, logger: logger}
}

// Run starts the ticker loop in a goroutine; it exits when ctx is cancelled.
func (w *ReminderWorker) Run(ctx context.Context) {
	go func() {
		w.logger.Info("sadhna reminder worker started", zap.Duration("interval", reminderInterval))
		t := time.NewTicker(reminderInterval)
		defer t.Stop()
		for {
			select {
			case <-ctx.Done():
				return
			case <-t.C:
				w.svc.RunOnce(ctx, time.Now())
			}
		}
	}()
}