package main

import (
	"context"
	"fmt"
	"strings"
)

type EchoHandler struct {
	tg *TelegramClient
}

func (e *EchoHandler) Handle(ctx context.Context, update Update, bot Bot) error {
	chatID, ok := update.ChatID()
	if !ok {
		return nil
	}
	text := strings.TrimSpace(update.Text())
	if text == "" {
		return nil
	}
	reply := text
	if strings.HasPrefix(text, "/echo") {
		reply = strings.TrimSpace(strings.TrimPrefix(text, "/echo"))
		if reply == "" {
			reply = "echo bot online — send me anything"
		}
	}
	if err := e.tg.SendMessage(ctx, bot.Token, SendMessageParams{ChatID: chatID, Text: reply}); err != nil {
		return fmt.Errorf("sendMessage: %w", err)
	}
	return nil
}