package bus

// Peer identifies the routing peer for a message (direct, group, channel, etc.)
type Peer struct {
	Kind string `json:"kind"` // "direct" | "group" | "channel" | ""
	ID   string `json:"id"`
}

// SenderInfo provides structured sender identity information.
type SenderInfo struct {
	Platform    string `json:"platform,omitempty"`     // "telegram", "discord", "slack", ...
	PlatformID  string `json:"platform_id,omitempty"`  // raw platform ID, e.g. "123456"
	CanonicalID string `json:"canonical_id,omitempty"` // "platform:id" format
	Username    string `json:"username,omitempty"`     // username (e.g. @alice)
	DisplayName string `json:"display_name,omitempty"` // display name
}

// InboundContext captures the normalized, platform-agnostic facts about an
// inbound message. This is the long-term source of truth for routing and
// session allocation. Legacy top-level fields on InboundMessage remain during
// the transition and are derived from this context when missing.
type InboundContext struct {
	Channel string `json:"channel"`
	Account string `json:"account,omitempty"`

	ChatID   string `json:"chat_id"`
	ChatType string `json:"chat_type,omitempty"` // direct / group / channel
	TopicID  string `json:"topic_id,omitempty"`

	SpaceID   string `json:"space_id,omitempty"`
	SpaceType string `json:"space_type,omitempty"` // guild / team / workspace / tenant

	SenderID  string `json:"sender_id"`
	MessageID string `json:"message_id,omitempty"`

	Mentioned bool `json:"mentioned,omitempty"`

	ReplyToMessageID string `json:"reply_to_message_id,omitempty"`
	ReplyToSenderID  string `json:"reply_to_sender_id,omitempty"`

	ReplyHandles map[string]string `json:"reply_handles,omitempty"`
	Raw          map[string]string `json:"raw,omitempty"`
}

type InboundMessage struct {
	Channel    string            `json:"channel"`
	SenderID   string            `json:"sender_id"`
	Sender     SenderInfo        `json:"sender"`
	ChatID     string            `json:"chat_id"`
	Context    InboundContext    `json:"context"`
	Content    string            `json:"content"`
	Media      []string          `json:"media,omitempty"`
	Peer       Peer              `json:"peer"`                  // routing peer
	MessageID  string            `json:"message_id,omitempty"`  // platform message ID
	MediaScope string            `json:"media_scope,omitempty"` // media lifecycle scope
	SessionKey string            `json:"session_key"`
	Metadata   map[string]string `json:"metadata,omitempty"`
}

type OutboundMessage struct {
	Channel          string `json:"channel"`
	ChatID           string `json:"chat_id"`
	Content          string `json:"content"`
	ReplyToMessageID string `json:"reply_to_message_id,omitempty"`
}

// MediaPart describes a single media attachment to send.
type MediaPart struct {
	Type        string `json:"type"`                   // "image" | "audio" | "video" | "file"
	Ref         string `json:"ref"`                    // media store ref, e.g. "media://abc123"
	Caption     string `json:"caption,omitempty"`      // optional caption text
	Filename    string `json:"filename,omitempty"`     // original filename hint
	ContentType string `json:"content_type,omitempty"` // MIME type hint
}

// OutboundMediaMessage carries media attachments from Agent to channels via the bus.
type OutboundMediaMessage struct {
	Channel string      `json:"channel"`
	ChatID  string      `json:"chat_id"`
	Parts   []MediaPart `json:"parts"`
}