package ws

import "encoding/json"

// ── Client → Server messages ──

// MsgType enumerates known message types.
type MsgType string

const (
	MsgHello MsgType = "hello"
	MsgStart MsgType = "start"
	MsgStop  MsgType = "stop"
	MsgPaste MsgType = "paste"
	MsgPing  MsgType = "ping"
	MsgPong  MsgType = "pong"
)

// ClientMsg is a JSON control message from the phone.
type ClientMsg struct {
	Type      MsgType `json:"type"`
	SessionID string  `json:"sessionId,omitempty"`
	Seq       int64   `json:"seq,omitempty"`
	Text      string  `json:"text,omitempty"` // Only for "paste"
	Version   int     `json:"version,omitempty"`
	TS        int64   `json:"ts,omitempty"`
	// Future extension: dynamic hotwords (Phase 2)
	// Hotwords []string `json:"hotwords,omitempty"`
}

// ── Server → Client messages ──

const (
	MsgReady    MsgType = "ready"
	MsgState    MsgType = "state"
	MsgStartAck MsgType = "start_ack"
	MsgStopAck  MsgType = "stop_ack"
	MsgPartial  MsgType = "partial"
	MsgFinal    MsgType = "final"
	MsgPasted   MsgType = "pasted"
	MsgError    MsgType = "error"
)

const (
	StateIdle      = "idle"
	StateRecording = "recording"
	StateStopping  = "stopping"
)

// ServerMsg is a JSON message sent to the phone.
type ServerMsg struct {
	Type      MsgType `json:"type"`
	State     string  `json:"state,omitempty"`
	SessionID string  `json:"sessionId,omitempty"`
	Seq       int64   `json:"seq,omitempty"`
	Text      string  `json:"text,omitempty"`
	Message   string  `json:"message,omitempty"` // For errors
	Code      string  `json:"code,omitempty"`
	Retryable bool    `json:"retryable,omitempty"`
	TS        int64   `json:"ts,omitempty"`
}

func (m ServerMsg) Bytes() []byte {
	b, _ := json.Marshal(m)
	return b
}