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Overview

The Daily Summary feature provides users with an interactive menu of all tracked products, sent automatically every day at 8:00 PM (server timezone). It serves as a centralized hub for managing tracked items.

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Schedule

The daily summary runs on a cron schedule: 
// Daily summary at 20:00 (server timezone)
cron.schedule("0 20 * * *", async () => {
  console.log("📄 Envío de resumen diario...");
  for (const chatId of chats) {
    try {
      await dailySummary(chatId);
      await new Promise(r => setTimeout(r, 400));
    } catch (err) {
      console.error(`❌ Error enviando resumen a ${chatId}:`, err.message);
    }
  }
});

Schedule

Every day at 20:00 (8:00 PM)

Cron Expression

0 20 * * * - Daily at hour 20, minute 0

Recipients

All registered chats receive the summary

Delay

400ms pause between each chat to avoid rate limiting

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Daily Summary Function

The dailySummary() function (lines 336-356) generates an interactive message: 
async function dailySummary(chatId) {
  const urls = Object.keys(priceData);
  if (!urls.length) {
    return bot.sendMessage(chatId, "📭 No tienes productos en seguimiento.\n\nUsa /add [url] para agregar uno.");
  }

  const inlineKeyboard = urls.map((u) => {
    const p = priceData[u];
    const title = p?.title || u;
    const truncated = title.length > 30 ? `${title.slice(0, 30)}...` : title;
    return [{ text: `📦 ${truncated}`, callback_data: `select_product:${u}` }];
  });

  inlineKeyboard.push([{ text: "🗑️ Eliminar todos", callback_data: "delete_all" }]);
  inlineKeyboard.push([{ text: "🔄 Revisar precios ahora", callback_data: "check_prices" }]);

  await bot.sendMessage(chatId, `📊 *Productos en seguimiento: ${urls.length}*\n\nSelecciona un producto para ver detalles:`, {
    parse_mode: "Markdown",
    reply_markup: { inline_keyboard: inlineKeyboard }
  });
}

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Message Format

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When Products Are Tracked

📊 Productos en seguimiento: 5

Selecciona un producto para ver detalles:

[📦 Apple AirPods Pro (2nd Gen...]
[📦 Samsung Galaxy S24 Ultra...]
[📦 Sony WH-1000XM5 Wireless...]
[📦 Logitech MX Master 3S Mouse]
[📦 iPhone 15 Pro Max 256GB...]

[🗑️ Eliminar todos]
[🔄 Revisar precios ahora]

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When No Products Are Tracked

📭 No tienes productos en seguimiento.

Usa /add [url] para agregar uno.
If no products are being tracked, the daily summary prompts users to add their first product.

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Interactive Menu

The daily summary includes inline keyboard buttons for each product and system actions:

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Product Buttons

Each tracked product gets a button with truncated title: 
const title = p?.title || u;
const truncated = title.length > 30 ? `${title.slice(0, 30)}...` : title;
return [{ text: `📦 ${truncated}`, callback_data: `select_product:${u}` }];
Product titles longer than 30 characters are truncated with ”…” to keep buttons readable.

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System Action Buttons

Two additional buttons provide quick access to bulk actions: 
inlineKeyboard.push([{ text: "🗑️ Eliminar todos", callback_data: "delete_all" }]);
inlineKeyboard.push([{ text: "🔄 Revisar precios ahora", callback_data: "check_prices" }]);

🗑️ Eliminar todos

Deletes all tracked products at once

🔄 Revisar precios ahora

Triggers immediate price check for all products

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Product Detail View

When a user clicks on a product button, they see detailed information: 
if (data.startsWith("select_product:")) {
  const productUrl = data.substring("select_product:".length);
  const product = priceData[productUrl];
  if (!product) return bot.sendMessage(chatId, "❌ Producto no encontrado.");

  const addedDate = product.addedDate ? new Date(product.addedDate).toLocaleDateString() : "N/A";
  const lastChecked = product.lastChecked ? new Date(product.lastChecked).toLocaleDateString() : "Nunca";
  const priceDifference = (product.lowestPrice || product.price) - product.price;
  const savingsText = priceDifference > 0 ? `\n💰 Ahorro desde el mínimo: $${priceDifference.toFixed(2)}` : "";

  const messageText =
`*${escapeMD(product.title)}*

💰 Precio actual: $${product.price}
📉 Precio más bajo visto: $${product.lowestPrice}
📅 Agregado: ${addedDate}
🔄 Última revisión: ${lastChecked}${savingsText}`;

  const keyboard = {
    inline_keyboard: [
      [{ text: "🛒 Ver en Amazon", url: product.url }],
      [
        { text: "✍🏻 Editar URL", callback_data: `edit_product:${productUrl}` },
        { text: "🗑️ Eliminar", callback_data: `delete_product:${productUrl}` }
      ],
      [{ text: "⏪ Volver a la lista", callback_data: "list" }],
      [{ text: "📈 Ver gráfico", callback_data: `chart:${productUrl}` }]
    ]
  };

  if (product.imageUrl) {
    await bot.sendPhoto(chatId, product.imageUrl, { 
      caption: messageText, 
      parse_mode: "Markdown", 
      reply_markup: keyboard 
    });
  } else {
    await bot.sendMessage(chatId, messageText, { 
      parse_mode: "Markdown", 
      reply_markup: keyboard 
    });
  }
}

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Example Product Detail

[Product Image]

Apple AirPods Pro (2nd Generation)

💰 Precio actual: $199.99
📉 Precio más bajo visto: $189.99
📅 Agregado: 3/1/2026
🔄 Última revisión: 3/10/2026
💰 Ahorro desde el mínimo: $10.00

[🛒 Ver en Amazon]
[✍🏻 Editar URL] [🗑️ Eliminar]
[⏪ Volver a la lista]
[📈 Ver gráfico]

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Manual Access

Users can manually trigger the daily summary using /list: 
// /list
bot.onText(/\/list/, async (msg) => dailySummary(msg.chat.id));
Use /list anytime to access the interactive product menu without waiting for 8 PM.

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Callback Actions

The daily summary’s inline buttons trigger various callback actions: 
if (data.startsWith("select_product:")) {
  const productUrl = data.substring("select_product:".length);
  const product = priceData[productUrl];
  // ... display product details with image and actions ...
}

} else if (data === "delete_all") {
  const totalProducts = Object.keys(priceData).length;
  priceData = {};
  saveData();
  await bot.sendMessage(chatId, `🗑️ Se eliminaron ${totalProducts} productos.`);
}

} else if (data === "check_prices") {
  const loading = await bot.sendMessage(chatId, "⏳ Iniciando revisión de precios...");
  try {
    await checkPrices();
    await bot.editMessageText("✅ Revisión completada.", { 
      chat_id: chatId, 
      message_id: loading.message_id 
    });
  } catch (err) {
    await bot.editMessageText("❌ Error durante la revisión.", { 
      chat_id: chatId, 
      message_id: loading.message_id 
    });
  }
}

} else if (data === "list") {
  await dailySummary(chatId);
}

} else if (data.startsWith("chart:")) {
  const url = data.substring("chart:".length);
  await sendPriceChart(chatId, url);
}

} else if (data.startsWith("edit_product:")) {
  const urlToEdit = data.substring("edit_product:".length);
  await bot.sendMessage(chatId, `✍🏻 Para editar la URL usa:\n\`/edit ${urlToEdit} [nueva_url]\``, { 
    parse_mode: "Markdown" 
  });
}

} else if (data.startsWith("delete_product:")) {
  const urlToDelete = data.substring("delete_product:".length);
  if (priceData[urlToDelete]) {
    const title = priceData[urlToDelete].title || urlToDelete;
    delete priceData[urlToDelete];
    saveData();
    await bot.sendMessage(chatId, `🗑️ *Producto eliminado:*\n${escapeMD(title)}`, { 
      parse_mode: "Markdown" 
    });
  } else {
    await bot.sendMessage(chatId, "❌ Producto no encontrado.");
  }
  await dailySummary(chatId);
}

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Broadcasting Strategy

The daily summary is sent to all registered chats sequentially: 
for (const chatId of chats) {
  try {
    await dailySummary(chatId);
    await new Promise(r => setTimeout(r, 400));
  } catch (err) {
    console.error(`❌ Error enviando resumen a ${chatId}:`, err.message);
  }
}
A 400ms delay between each chat prevents overwhelming Telegram’s API and reduces the risk of rate limiting.

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Error Handling

If sending to a specific chat fails, the error is logged but doesn’t stop other deliveries: 
} catch (err) {
  console.error(`❌ Error enviando resumen a ${chatId}:`, err.message);
}
This ensures maximum delivery success even if some chats are inaccessible (e.g., user blocked the bot).

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Benefits of Daily Summaries

Daily Engagement

Keeps users engaged with tracked products

Quick Access

One-click access to all product details

Bulk Actions

Easy management of multiple products

Price Awareness

Daily reminder of tracked deals
The daily summary transforms passive price tracking into an active monitoring experience, encouraging users to check their products regularly and take action on price drops.

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