package cabana

import (
	"context"

	"git.golem15.com/golem15/summercms/modules/backpack"
	"git.golem15.com/golem15/summercms/modules/pact"
)

// backendSubjectGuard is the guard name backend subject events carry: the
// admin's own bouncer guard.
const backendSubjectGuard = "backend"

// fireSubjectChanged fires one pact.MCPSubjectChanged of the given kind for
// every administrator id through the application's event bus, so the MCP
// endpoint re-lists a linked admin's tools or ends their sessions. A missing
// application or bus is a no-op and a listener's error is logged: the save
// that caused the event never fails because of it.
func fireSubjectChanged(ctx context.Context, app *backpack.App, kind string, adminIDs ...uint) {
	if app == nil || app.Events == nil {
		return
	}
	if ctx == nil {
		ctx = context.Background()
	}
	for _, id := range adminIDs {
		if id == 0 {
			continue
		}
		event := pact.MCPSubjectChanged{Guard: backendSubjectGuard, UserID: id, Kind: kind}
		if err := app.Events.Fire(ctx, event); err != nil {
			moduleLog.WarnContext(ctx, "cabana: subject changed listener failed", "kind", kind, "admin_id", id, "error", err)
		}
	}
}