// std lib
const crypto = require("crypto");

// npm imports
const { Bot, Keyboard } = require("grammy");

// module imports
const cache = require("./cache");
const request = require("./request");

// TODO: get value from confini
// TODO: webhook support
const bot = new Bot("");

// TODO: handle errors
bot.command("start", async (ctx) => {
  const tgLinked = await cache.get(ctx.msg.from.id);

  if (tgLinked) {
    await cache.set(tgLinked, crypto.randomBytes(16).toString("hex"));
    const res = await request.proxy(tgLinked);

    return ctx.reply(res.text);
  }

  const keyboard = new Keyboard();
  return await ctx.reply(
    "Click on the button  below to link your phone number.",
    {
      reply_markup: keyboard.requestContact("Link Phone"),
    }
  );
});

// TODO: handle errors
bot.on("message:text", async (ctx) => {
  const tgLinked = await cache.get(ctx.msg.from.id);

  if (tgLinked) {
    const res = await request.proxy(tgLinked, ctx.msg.text);

    if (res.code !== "END") {
      return ctx.reply(res.text);
    }

    return await cache.del(tgLinked);
  }

  return await ctx.reply(
    "Session expired or account not linked. /start the bot again to access your Sarafu account."
  );
});

// TODO: handle errors
bot.on("msg:contact", async (ctx) => {
  // TODO: check if msg is reply from bot to prevent contact share bypass
  const contact = ctx.msg.contact;
  if (contact.phone_number.slice(0, 4) !== "+254") {
    return ctx.reply("Sarafu is only available in Kenya at the moment.");
  }

  // TODO: use contact.user_id in actual guard to prevent contact share bypass
  await cache.set(ctx.msg.from.id, contact.phone_number.slice(1));

  return ctx.reply(
    "Phone number successfully linked. /start the bot again to access your Sarafu account."
  );
});

bot.start();