import { Bot } from "grammy";
import express from "express";

const TELEGRAM_BOT_TOKEN = process.env.TELEGRAM_BOT_TOKEN;
const DEEPAGENTS_URL = process.env.DEEPAGENTS_URL || "http://deepagents:8000";

const bot = new Bot(TELEGRAM_BOT_TOKEN);

// Forward all text messages to the unified gateway /message endpoint
bot.on("message:text", (ctx) => {
  const text = ctx.message.text;
  const chat_id = String(ctx.chat.id);

  console.log(`[grammy] message from ${chat_id}: ${text.slice(0, 80)}`);

  fetch(`${DEEPAGENTS_URL}/message`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      text,
      session_id: `tg-${chat_id}`,
      channel: "telegram",
      user_id: chat_id,
    }),
  }).catch((err) => console.error("[grammy] error forwarding to deepagents:", err));
});

// HTTP server — delivers replies from the gateway back to Telegram
const app = express();
app.use(express.json());

app.post("/send", async (req, res) => {
  const { chat_id, text } = req.body;
  if (!chat_id || !text) {
    res.status(400).json({ error: "chat_id and text required" });
    return;
  }
  try {
    await bot.api.sendMessage(chat_id, text);
    console.log(`[grammy] sent to ${chat_id}: ${text.slice(0, 60)}`);
    res.json({ ok: true });
  } catch (err) {
    console.error(`[grammy] send error to ${chat_id}:`, err.message);
    res.status(500).json({ error: err.message });
  }
});

app.get("/health", (_req, res) => res.json({ ok: true }));

app.listen(3001, () => {
  console.log("[grammy] HTTP server listening on port 3001");
});

bot.start({
  onStart: (info) => console.log(`[grammy] bot @${info.username} started`),
});