// Helper: SNR (dB) to emoji "bar chart"
function snrToBars(db) {
  const snr = Math.max(Math.min(db, 0), -30); // clamp -30 to 0
  const levels = 5;
  const filled = Math.round(((snr + 30) / 30) * levels);
  return '▓'.repeat(filled) + '░'.repeat(levels - filled);
}

// Helper: ISO country code (e.g. "CA") → 🇨🇦 emoji
function countryCodeToFlagEmoji(cc) {
  if (!cc) return '';
  return cc.toUpperCase().replace(/./g, c =>
    String.fromCodePoint(0x1f1e6 - 65 + c.charCodeAt(0))
  );
}
// Helper: emoji fr wind direction
function getWindDirectionEmoji(degree) {
  // Normalize degree to 0-359
  const d = ((degree % 360) + 360) % 360;

  // Define ranges and corresponding emoji
  const directions = [
    { min: 337.5, max: 360, emoji: '⬇️' },   // North -> Down (wind comes from North, goes South)
    { min: 0,     max: 22.5, emoji: '⬇️' },   // North
    { min: 22.5,  max: 67.5, emoji: '↙️' },   // NE
    { min: 67.5,  max: 112.5, emoji: '⬅️' },  // East -> Left
    { min: 112.5, max: 157.5, emoji: '↖️' },  // SE
    { min: 157.5, max: 202.5, emoji: '⬆️' },  // South -> Up
    { min: 202.5, max: 247.5, emoji: '↗️' },  // SW
    { min: 247.5, max: 292.5, emoji: '➡️' },  // West -> Right
    { min: 292.5, max: 337.5, emoji: '↘️' }   // NW
  ];

  for (const dir of directions) {
    if (d >= dir.min && d < dir.max) {
      return dir.emoji;
    }
  }

  return '❓'; // fallback
}

function formatMessageWX(data) {
  const {
    temperature_C,
    temperature_F,
    humidity,
    rain_mm,
    wind_dir_deg,
    wind_avg_m_s,
    wind_max_m_s,
    light_lux,
    uv,
    mic,
    mode,
    model,
    timestamp
  } = data;

  const emoji = {
    temp: "🌡️",
    humidity: "💧",
    rain: "🌧️",
    wind: "🍃",
    light: "💡",
    uv: "☀️",
    mic: "🎙️",
    time: "🕒",
    mode: "⚙️"
  };

  const dirEmoji = getWindDirectionEmoji(wind_dir_deg);
  const readableTime = new Date(timestamp).toLocaleString();
  // Acurite-986 is giving celsius under _F
  const temperature = temperature_C || temperature_F;

  const response =
    `${emoji.mic} reporting ${model}\n` +
          (temperature !== undefined ?
           `${emoji.temp} Temperature: ${temperature.toFixed(1)} °C\n` : '') +
          (humidity !== undefined ?
           `${emoji.humidity} Humidity: ${humidity}%\n` : '') +
          (rain_mm !==undefined ?
           `${emoji.rain} Rainfall: ${rain_mm} mm\n` : '') +
          (wind_dir_deg !==undefined ?
           `${emoji.wind} Wind: ${wind_avg_m_s} m/s avg, ${wind_max_m_s}m/s max
    ${dirEmoji} (${wind_dir_deg}°)\n` : '') +
          (light_lux !== undefined ?
           `${emoji.light} Light: ${light_lux} lux\n` : '') +
          (uv !== undefined ?
           `${emoji.uv} UV Index: ${uv}\n` : '') +
          `${emoji.time} Time: ${readableTime}\n`;

  console.log(`hh response`, response);
  return response.trim();
}

function formatMessageCQ(data) {
  const {
    callsign,
    msg,
    ccode,
    country,
    mode,
    freq,
    db,
    dt,
    locator
  } = data;

  // Country flag emoji
  const emojiFlag = countryCodeToFlagEmoji(ccode);

  // Convert frequency Hz to MHz with 3 decimal digits
  const freqMHz = (freq / 1_000_000).toFixed(3);

  // RSSI visual bars
  const rssiBars = snrToBars(db);

  // Google Maps locator search
  const mapLink = `https://k7fry.com/grid/?qth=${locator}`;

  return `📡 ${callsign} ${emojiFlag} 📍<a href="${mapLink}">${locator}</a>
📶 ${db} dB | ${dt} s | ${rssiBars}
🔊 ${freqMHz}MHz ${mode} `;
}

module.exports = [
  {
    name: "CQ",
    rule: (data) => data?.msg?.includes('CQ'),
    msg: formatMessageCQ,
  },
  {
    name: "WX",
    // Not to miss the zero degree
    rule: (data) => data?.temperature_C !== undefined
               || data?.temperature_F !== undefined,
    msg: formatMessageWX,
  },
];