// Package metricsintentpub wraps a ports.IntentPublisher with the
// `lobby.notification.publish_attempts` counter from
// `lobby/README.md` §Observability.
package metricsintentpub

import (
	"context"

	"galaxy/lobby/internal/ports"
	"galaxy/lobby/internal/telemetry"
	"galaxy/notificationintent"
)

// Publisher decorates an inner ports.IntentPublisher and increments
// `lobby.notification.publish_attempts` after each call.
type Publisher struct {
	inner     ports.IntentPublisher
	telemetry *telemetry.Runtime
}

// New constructs one Publisher around inner. When telemetryRuntime is nil,
// the wrapper still delegates Publish but does not record metrics.
func New(inner ports.IntentPublisher, telemetryRuntime *telemetry.Runtime) *Publisher {
	return &Publisher{inner: inner, telemetry: telemetryRuntime}
}

// Publish forwards intent to the inner publisher and records the attempt
// outcome under the frozen `result` attribute (`ok`/`error`).
func (publisher *Publisher) Publish(ctx context.Context, intent notificationintent.Intent) (string, error) {
	if publisher == nil || publisher.inner == nil {
		return "", nil
	}

	id, err := publisher.inner.Publish(ctx, intent)
	result := "ok"
	if err != nil {
		result = "error"
	}
	publisher.telemetry.RecordNotificationPublish(ctx, string(intent.NotificationType), result)
	return id, err
}

// Compile-time interface assertion.
var _ ports.IntentPublisher = (*Publisher)(nil)