package realtime

// EventPublisher sends SSE events to users and channels.
// Implementations:
//   - SSEPublisher: publishes via Redis for cross-process delivery (production)
//   - LocalPublisher: delivers directly to SSEHub in-process (development)
type EventPublisher interface {
	SendToUser(userID string, event *SSEEvent) error
	SendToChannel(channel string, event *SSEEvent) error
}

// Compile-time interface checks.
var (
	_ EventPublisher = (*SSEPublisher)(nil)
	_ EventPublisher = (*LocalPublisher)(nil)
)

// LocalPublisher delivers SSE events directly to the local SSEHub.
// Use this when the service and worker run in the same process (standalone/dev mode).
type LocalPublisher struct {
	hub *SSEHub
}

// NewLocalPublisher creates a publisher that sends events directly to the SSEHub.
func NewLocalPublisher(hub *SSEHub) *LocalPublisher {
	return &LocalPublisher{hub: hub}
}

// SendToUser sends an event to a user's SSE channel.
func (p *LocalPublisher) SendToUser(userID string, event *SSEEvent) error {
	p.hub.SendToUser(userID, event)
	return nil
}

// SendToChannel sends an event to a named SSE channel.
func (p *LocalPublisher) SendToChannel(channel string, event *SSEEvent) error {
	p.hub.SendToChannel(channel, event)
	return nil
}