package aether

import (
	"time"
)

// Event represents a domain event in the system
type Event struct {
	ID        string                 `json:"id"`
	EventType string                 `json:"eventType"`
	ActorID   string                 `json:"actorId"`
	CommandID string                 `json:"commandId,omitempty"` // Correlation ID for command that triggered this event
	Version   int64                  `json:"version"`
	Data      map[string]interface{} `json:"data"`
	Timestamp time.Time              `json:"timestamp"`
}

// ActorSnapshot represents a point-in-time state snapshot
type ActorSnapshot struct {
	ActorID   string                 `json:"actorId"`
	Version   int64                  `json:"version"`
	State     map[string]interface{} `json:"state"`
	Timestamp time.Time              `json:"timestamp"`
}

// EventStore defines the interface for event persistence
type EventStore interface {
	SaveEvent(event *Event) error
	GetEvents(actorID string, fromVersion int64) ([]*Event, error)
	GetLatestVersion(actorID string) (int64, error)
}

// SnapshotStore extends EventStore with snapshot capabilities
type SnapshotStore interface {
	EventStore
	GetLatestSnapshot(actorID string) (*ActorSnapshot, error)
	SaveSnapshot(snapshot *ActorSnapshot) error
}