package main

type Update struct {
	UpdateID      int64          `json:"update_id"`
	Message       *Message       `json:"message,omitempty"`
	EditedMessage *Message       `json:"edited_message,omitempty"`
	CallbackQuery *CallbackQuery `json:"callback_query,omitempty"`
}

type Message struct {
	MessageID int64  `json:"message_id"`
	From      *User  `json:"from,omitempty"`
	Chat      Chat   `json:"chat"`
	Date      int64  `json:"date,omitempty"`
	Text      string `json:"text,omitempty"`
}

type Chat struct {
	ID   int64  `json:"id"`
	Type string `json:"type,omitempty"`
}

type User struct {
	ID        int64  `json:"id"`
	IsBot     bool   `json:"is_bot,omitempty"`
	Username  string `json:"username,omitempty"`
	FirstName string `json:"first_name,omitempty"`
}

type CallbackQuery struct {
	ID      string   `json:"id"`
	From    *User    `json:"from,omitempty"`
	Message *Message `json:"message,omitempty"`
	Data    string   `json:"data,omitempty"`
}

func (u Update) ChatID() (int64, bool) {
	switch {
	case u.Message != nil:
		return u.Message.Chat.ID, true
	case u.EditedMessage != nil:
		return u.EditedMessage.Chat.ID, true
	case u.CallbackQuery != nil && u.CallbackQuery.Message != nil:
		return u.CallbackQuery.Message.Chat.ID, true
	}
	return 0, false
}

// UserID extracts the Telegram user ID (`from.id`) from whichever sub-payload
// is set. Used by the auth layer (factory bot session, requireAuth gate, allowlist).
// See factory/doc/adr/20260509-telegram-gateway-auth.md.
func (u Update) UserID() (int64, bool) {
	switch {
	case u.Message != nil && u.Message.From != nil:
		return u.Message.From.ID, true
	case u.EditedMessage != nil && u.EditedMessage.From != nil:
		return u.EditedMessage.From.ID, true
	case u.CallbackQuery != nil && u.CallbackQuery.From != nil:
		return u.CallbackQuery.From.ID, true
	}
	return 0, false
}

func (u Update) Text() string {
	switch {
	case u.Message != nil:
		return u.Message.Text
	case u.EditedMessage != nil:
		return u.EditedMessage.Text
	case u.CallbackQuery != nil:
		return u.CallbackQuery.Data
	}
	return ""
}