function parseWeatherStatus(raw) {
  try {
    var data = JSON.parse(String(raw || "{}"))
    return {
      label: data.text || "",
      klass: data.class || ""
    }
  } catch (e) {
    return { label: "", klass: "" }
  }
}

function isFutureForecastDate(dateString, todayString) {
  if (!dateString) return false
  return String(dateString).slice(0, 10) > String(todayString || "")
}

function roundedTemp(value) {
  if (value === undefined || value === null || value === "") return ""
  var n = parseFloat(String(value))
  return isNaN(n) ? "" : String(Math.round(n))
}

function celsiusToFahrenheit(value) {
  if (value === undefined || value === null || value === "") return ""
  var n = parseFloat(String(value))
  return isNaN(n) ? "" : (n * 9 / 5) + 32
}

function formatTemp(value, useImperial) {
  if (value === undefined || value === null || value === "") return ""
  return value + "°" + (useImperial ? "F" : "C")
}

function dayName(dateString, formatter) {
  if (!dateString) return ""
  var d = new Date(dateString + "T12:00:00")
  if (isNaN(d.getTime())) return ""
  if (formatter) return formatter(d)
  return ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"][d.getDay()]
}

function openMeteoForecastDays(dailyForecastReport, todayString) {
  var daily = dailyForecastReport && dailyForecastReport.daily ? dailyForecastReport.daily : null
  if (!daily || !daily.time) return []

  var result = []
  for (var i = 0; i < daily.time.length && result.length < 3; ++i) {
    var date = daily.time[i]
    if (!isFutureForecastDate(date, todayString)) continue

    var maxC = daily.temperature_2m_max ? daily.temperature_2m_max[i] : ""
    var minC = daily.temperature_2m_min ? daily.temperature_2m_min[i] : ""
    result.push({
      date: date,
      maxtempC: roundedTemp(maxC),
      mintempC: roundedTemp(minC),
      maxtempF: roundedTemp(celsiusToFahrenheit(maxC)),
      mintempF: roundedTemp(celsiusToFahrenheit(minC)),
      openMeteoWeatherCode: daily.weather_code ? daily.weather_code[i] : null
    })
  }
  return result
}

function wttrNextForecastDays(report, todayString) {
  var days = report && report.weather ? report.weather : []
  var result = []
  for (var i = 0; i < days.length && result.length < 3; ++i) {
    if (isFutureForecastDate(days[i].date, todayString)) result.push(days[i])
  }
  return result
}

function buildForecastDays(report, dailyForecastReport, todayString) {
  var days = openMeteoForecastDays(dailyForecastReport, todayString)
  return days.length > 0 ? days : wttrNextForecastDays(report, todayString)
}

function bareTempForDay(day, kind, useImperial) {
  if (!day) return ""
  var v = useImperial
    ? (kind === "max" ? day.maxtempF : day.mintempF)
    : (kind === "max" ? day.maxtempC : day.mintempC)
  if (v === undefined || v === null || v === "") return ""
  return v + "°"
}

function dayIcon(day) {
  if (!day) return ""
  if (day.openMeteoWeatherCode !== undefined && day.openMeteoWeatherCode !== null)
    return iconForOpenMeteoCode(day.openMeteoWeatherCode)
  if (!day.hourly || day.hourly.length === 0) return ""

  var best = day.hourly[0]
  var bestDist = 9999
  for (var i = 0; i < day.hourly.length; ++i) {
    var t = parseInt(String(day.hourly[i].time || "0"), 10)
    var dist = Math.abs(t - 1200)
    if (dist < bestDist) {
      bestDist = dist
      best = day.hourly[i]
    }
  }
  return iconForCode(best.weatherCode, false)
}

function iconForOpenMeteoCode(code) {
  var c = parseInt(String(code || "0"), 10)
  if (c === 0) return iconForCode(113, false)
  if (c === 1 || c === 2) return iconForCode(116, false)
  if (c === 3) return iconForCode(119, false)
  if (c === 45 || c === 48) return iconForCode(143, false)
  if (c === 51 || c === 53 || c === 55 || c === 56 || c === 57 || c === 61) return iconForCode(266, false)
  if (c === 63 || c === 65 || c === 66 || c === 67 || c === 80 || c === 81 || c === 82) return iconForCode(308, false)
  if (c === 71 || c === 73 || c === 75 || c === 77 || c === 85 || c === 86) return iconForCode(338, false)
  if (c === 95 || c === 96 || c === 99) return iconForCode(389, false)
  return iconForCode(119, false)
}

function iconForCode(code, night) {
  var c = parseInt(String(code || "0"), 10)
  switch (c) {
    case 113: return night ? "" : ""
    case 116: return night ? "" : ""
    case 119: case 122: return ""
    case 143: case 248: case 260: return ""
    case 176: case 263: case 353: return night ? "" : ""
    case 179: case 227: case 230: case 323: case 326: case 368: return night ? "" : ""
    case 182: case 185: case 281: case 284: case 311: case 314:
    case 317: case 320: case 350: case 362: case 365: case 374: case 377: return ""
    case 200: case 386: case 389: case 392: case 395: return ""
    case 266: case 293: case 296: case 299: case 302: case 305: case 308: case 356: case 359: return ""
    case 329: case 332: case 335: case 338: case 371: return ""
    default: return ""
  }
}

if (typeof module !== "undefined") {
  module.exports = {
    parseWeatherStatus: parseWeatherStatus,
    isFutureForecastDate: isFutureForecastDate,
    roundedTemp: roundedTemp,
    celsiusToFahrenheit: celsiusToFahrenheit,
    formatTemp: formatTemp,
    dayName: dayName,
    openMeteoForecastDays: openMeteoForecastDays,
    wttrNextForecastDays: wttrNextForecastDays,
    buildForecastDays: buildForecastDays,
    bareTempForDay: bareTempForDay,
    dayIcon: dayIcon,
    iconForOpenMeteoCode: iconForOpenMeteoCode,
    iconForCode: iconForCode
  }
}