package library

import (
	"context"
	"sync"

	"github.com/jackc/pgx/v5/pgtype"

	"git.fabledsword.com/bvandeusen/minstrel/internal/notifications"
)

// Package-level notifier for library-health notices to admins (M489): a
// scan that failed, tracks gone missing, new duplicates. Set once at startup
// beside SetEventBus, for the same reason the bus is package-level. Nil, as in
// tests that never set it, means nobody is told.
var (
	notifierMu sync.RWMutex
	notifier   *notifications.Notifier
)

// SetNotifier wires the notifications inbox into the library package.
func SetNotifier(n *notifications.Notifier) {
	notifierMu.Lock()
	defer notifierMu.Unlock()
	notifier = n
}

// notifyAdmins tells every admin about a library-health event. These kinds
// coalesce, so a burst is one unread notice with a running count.
func notifyAdmins(ctx context.Context, kind notifications.Kind, p notifications.Payload) {
	notifierMu.RLock()
	n := notifier
	notifierMu.RUnlock()
	n.NotifyLogged(ctx, kind, notifications.ToAdmins(pgtype.UUID{}), p.Map())
}

// notifyScanFinished tells admins a scan run ended in error. A scan cut short
// by shutdown is not a failure anyone needs telling about.
func notifyScanFinished(ctx context.Context, errMsg string) {
	if errMsg == "" || ctx.Err() != nil {
		return
	}
	notifyAdmins(ctx, notifications.KindScanFailed, notifications.Payload{Count: 1, Detail: errMsg})
}