package channel

// EventType defines channel lifecycle and messaging events.
// Reference: P2D §8 + Chatwoot Dispatcher + Listener event-driven architecture
// These events are published to the Event Bus for cross-module propagation.
type EventType string

const (
	// Message events
	EventMessageIncoming     EventType = "message.incoming"
	EventMessageOutgoing     EventType = "message.outgoing"
	EventMessageCreated      EventType = "message.created"
	EventMessageUpdated      EventType = "message.updated"
	EventMessageDeleted      EventType = "message.deleted"
	EventMessageStatusUpdated EventType = "message.status_updated"

	// Conversation events
	EventConversationCreated  EventType = "conversation.created"
	EventConversationUpdated  EventType = "conversation.updated"
	EventConversationResolved EventType = "conversation.resolved"
	EventConversationOpened   EventType = "conversation.opened"
	EventConversationAssigned   EventType = "conversation.assigned"
	EventConversationUnassigned EventType = "conversation.unassigned"
	EventConversationDeleted    EventType = "conversation.deleted"
	EventConversationMuted      EventType = "conversation.muted"
	EventConversationUnmuted    EventType = "conversation.unmuted"
	EventConversationPriorityUpdated EventType = "conversation.priority_updated"
	EventConversationLabelsUpdated   EventType = "conversation.labels_updated"
	EventConversationTyping          EventType = "conversation.typing"

	// Contact events
	EventContactCreated EventType = "contact.created"
	EventContactUpdated EventType = "contact.updated"
	EventContactDeleted EventType = "contact.deleted"
	EventContactMerged  EventType = "contact.merged"

	// Channel/Inbox events
	EventChannelConnected    EventType = "channel.connected"
	EventChannelDisconnected EventType = "channel.disconnected"
	EventChannelReauthorized EventType = "channel.reauthorized"
	EventInboxCreated        EventType = "inbox.created"
	EventInboxUpdated        EventType = "inbox.updated"
	EventInboxDeleted        EventType = "inbox.deleted"

	// Webhook events
	EventWebhookReceived EventType = "webhook.received"

	// Agent events
	EventAgentAdded    EventType = "agent.added"
	EventAgentRemoved  EventType = "agent.removed"
	EventAgentOnline   EventType = "agent.online"
	EventAgentOffline  EventType = "agent.offline"

	// Typing events
	EventTypingStart EventType = "typing.start"
	EventTypingStop  EventType = "typing.stop"
)

// ChannelEvent wraps an event with full context for event bus propagation.
// Reference: P2D §8 — events carry enough context for handlers to process without DB lookups
type ChannelEvent struct {
	Type       EventType              `json:"type"`
	Channel    ChannelType            `json:"channel"`
	AccountID  uint                   `json:"account_id"`
	InboxID    uint                   `json:"inbox_id"`
	ConversationID uint              `json:"conversation_id,omitempty"`
	ContactID  uint                   `json:"contact_id,omitempty"`
	UserID     uint                   `json:"user_id,omitempty"`
	Data       map[string]interface{} `json:"data"`
	Timestamp  int64                  `json:"timestamp"`
}

// NewChannelEvent creates a new channel event with timestamp.
func NewChannelEvent(eventType EventType, channelType ChannelType, accountID, inboxID uint) *ChannelEvent {
	return &ChannelEvent{
		Type:       eventType,
		Channel:    channelType,
		AccountID:  accountID,
		InboxID:    inboxID,
		Data:       make(map[string]interface{}),
		Timestamp:  0, // will be set by event bus publisher
	}
}