/**
 * notify.mjs — Telegram notifications
 * Sends messages directly via Telegram Bot API
 */
import { TELEGRAM_API_BASE, NOTIFY_RATE_LIMIT_MS } from './constants.mjs';

let lastSentAt = 0;

export async function sendTelegram(settings, message) {
  const { bot_token, telegram_user_id } = settings.notifications;
  if (!bot_token || !telegram_user_id) {
    console.log(`[notify] No Telegram config — would send: ${message.substring(0, 80)}`);
    return;
  }

  // Rate limit to avoid Telegram API throttling
  const now = Date.now();
  const elapsed = now - lastSentAt;
  if (elapsed < NOTIFY_RATE_LIMIT_MS) {
    await new Promise(r => setTimeout(r, NOTIFY_RATE_LIMIT_MS - elapsed));
  }

  const url = `${TELEGRAM_API_BASE}${bot_token}/sendMessage`;
  try {
    const res = await fetch(url, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        chat_id: telegram_user_id,
        text: message,
        parse_mode: 'Markdown',
      }),
    });
    lastSentAt = Date.now();
    const data = await res.json();
    if (!data.ok) console.error('[notify] Telegram error:', data.description);
  } catch (e) {
    console.error('[notify] Failed to send Telegram message:', e.message);
  }
}

export function formatSearchSummary(added, skipped, platforms) {
  if (added === 0) return `🔍 *Job Search Complete*\nNo new jobs found this run.`;
  return `🔍 *Job Search Complete*\n${added} new job${added !== 1 ? 's' : ''} added to queue (${skipped} already seen)\nPlatforms: ${platforms.join(', ')}`;
}

export function formatApplySummary(results) {
  const { submitted, failed, needs_answer, total,
          skipped_recruiter, skipped_external, skipped_no_easy_apply,
          already_applied, atsCounts } = results;

  const lines = [
    `✅ *Apply Run Complete* — ${total} jobs processed`,
    ``,
    `📬 Applied: ${submitted}`,
    `⏭️  Skipped (no Easy Apply): ${skipped_no_easy_apply}`,
    `🚫 Recruiter-only: ${skipped_recruiter}`,
    `🔁 Already applied: ${already_applied || 0}`,
    `❌ Failed: ${failed}`,
    `💬 Needs your answer: ${needs_answer}`,
  ];

  if (skipped_external > 0 && atsCounts) {
    const sorted = Object.entries(atsCounts).sort((a, b) => b[1] - a[1]);
    lines.push(``, `🌐 *External ATS — ${skipped_external} jobs* (saved for later):`);
    for (const [platform, count] of sorted) {
      lines.push(`  • ${platform}: ${count}`);
    }
  }

  if (needs_answer > 0) lines.push(``, `💬 Check Telegram — questions waiting for your answers`);

  return lines.join('\n');
}

export function formatUnknownQuestion(job, question) {
  return `❓ *Unknown question while applying*\n\n*Job:* ${job.title} @ ${job.company}\n*Question:* "${question}"\n\nWhat should I answer? (Reply and I'll save it for all future runs)`;
}