package watch

import (
	"fmt"

	"github.com/david/knox/internal/db"
)

// Reconcile rebuilds all derived state from the observation log: entries are
// reconstituted via deterministic SQL aggregation, then the auto-threader
// re-links/re-creates threads idempotently by cluster_key. Returns the threads
// created and observations linked.
func Reconcile(kdb *db.KnoxDB) (int, int, error) {
	if _, _, err := kdb.RebuildEntriesFromObservations(); err != nil {
		return 0, 0, fmt.Errorf("rebuild entries: %w", err)
	}
	threader := NewAutoThreader(kdb)
	created, linked, err := threader.AutoThread()
	if err != nil {
		return 0, 0, fmt.Errorf("auto-thread: %w", err)
	}
	return created, linked, nil
}