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package service
import (
"context"
"errors"
"log/slog"
"sync"
"time"
"codeberg.org/snonux/player/internal/clock"
"codeberg.org/snonux/player/internal/model"
"codeberg.org/snonux/player/internal/scanner"
)
// scanService handles triggering and tracking media library scans.
type scanService struct {
scanner scanner.Scanner
mediaRoot string
clock clock.Clock
logger *slog.Logger
mu sync.Mutex
scanCancel context.CancelFunc
progress *model.ScanProgress
appCtx context.Context // application-level context used to propagate shutdown cancellation
doneCh chan<- struct{}
}
// NewScanService creates a ScanService.
func NewScanService(appCtx context.Context, sc scanner.Scanner, mediaRoot string, clk clock.Clock, logger *slog.Logger) *scanService {
if logger == nil {
logger = slog.Default()
}
return &scanService{
scanner: sc,
mediaRoot: mediaRoot,
clock: clk,
logger: logger,
appCtx: appCtx,
}
}
func (s *scanService) TriggerRescan(ctx context.Context) error {
if s.scanner == nil {
return errors.New("scanner not configured")
}
s.mu.Lock()
if s.scanCancel != nil {
s.scanCancel()
}
// Derive the scan context from the application-level context so that
// cancellation propagates on server exit, while still applying a 30-minute timeout.
scanCtx, cancel := context.WithTimeout(s.appCtx, 30*time.Minute)
s.scanCancel = cancel
progress := &model.ScanProgress{}
s.progress = progress
s.mu.Unlock()
go func() {
defer cancel()
err := s.scanner.Scan(scanCtx, s.mediaRoot, progress)
if err == nil {
err = scanCtx.Err()
}
if err != nil {
progress.Done(err)
s.logger.Error("rescan failed", "err", err)
} else {
progress.Done(nil)
s.logger.Info("rescan completed")
}
s.notifyDone()
}()
return nil
}
func (s *scanService) ScanProgress(ctx context.Context) model.ScanProgress {
s.mu.Lock()
progress := s.progress
s.mu.Unlock()
if progress == nil {
return model.ScanProgress{}
}
return progress.Copy()
}
func (s *scanService) notifyDone() {
if s.doneCh == nil {
return
}
select {
case s.doneCh <- struct{}{}:
default:
}
}
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