package events

import (
	"context"
	"sync"
)

// Recording is a test Publisher that records events synchronously.
type Recording struct {
	mu  sync.Mutex
	evs []any
}

// Publish appends ev.
func (r *Recording) Publish(_ context.Context, ev any) {
	if r == nil {
		return
	}
	r.mu.Lock()
	defer r.mu.Unlock()
	r.evs = append(r.evs, ev)
}

// Len returns the number of recorded events.
func (r *Recording) Len() int {
	if r == nil {
		return 0
	}
	r.mu.Lock()
	defer r.mu.Unlock()
	return len(r.evs)
}

// Snapshot returns a copy of recorded events.
func (r *Recording) Snapshot() []any {
	if r == nil {
		return nil
	}
	r.mu.Lock()
	defer r.mu.Unlock()
	out := make([]any, len(r.evs))
	copy(out, r.evs)
	return out
}