// weather_mapper.go - Maps FMI weather symbols to OWM format
package main

import "time"

// WeatherMapper handles weather symbol mapping
type WeatherMapper struct {
	symbolMap map[int]Weather
}

// NewWeatherMapper creates a new weather mapper
func NewWeatherMapper() *WeatherMapper {
	return &WeatherMapper{
		symbolMap: map[int]Weather{
			1:  {800, "Clear", "clear sky", "01"},
			2:  {801, "Clouds", "few clouds", "02"},
			3:  {802, "Clouds", "scattered clouds", "03"},
			4:  {803, "Clouds", "broken clouds", "04"},
			5:  {804, "Clouds", "overcast clouds", "04"},
			6:  {701, "Mist", "mist", "50"},
			7:  {701, "Mist", "mist", "50"},
			8:  {741, "Fog", "fog", "50"},
			9:  {741, "Fog", "fog", "50"},
			10: {741, "Fog", "fog", "50"},
			11: {300, "Drizzle", "light intensity drizzle", "09"},
			12: {301, "Drizzle", "drizzle", "09"},
			13: {302, "Drizzle", "heavy intensity drizzle", "09"},
			21: {520, "Rain", "light intensity shower rain", "09"},
			22: {521, "Rain", "shower rain", "09"},
			23: {522, "Rain", "heavy intensity shower rain", "09"},
			24: {511, "Rain", "freezing rain", "13"},
			25: {500, "Rain", "light rain", "10"},
			26: {501, "Rain", "moderate rain", "10"},
			27: {502, "Rain", "heavy intensity rain", "10"},
			30: {500, "Rain", "light rain", "10"},
			31: {501, "Rain", "moderate rain", "10"},
			32: {502, "Rain", "heavy intensity rain", "10"},
			40: {600, "Snow", "light snow", "13"},
			41: {600, "Snow", "light snow", "13"},
			42: {601, "Snow", "snow", "13"},
			43: {602, "Snow", "heavy snow", "13"},
			91: {200, "Thunderstorm", "thunderstorm with light rain", "11"},
		},
	}
}

// Map converts FMI weather symbol to OWM weather with day/night icon
func (wm *WeatherMapper) Map(symbol int, forecastTime, sunrise, sunset time.Time) Weather {
	weather, ok := wm.symbolMap[symbol]
	if !ok {
		weather = Weather{800, "Clear", "clear sky", "01"}
	}

	// Determine day/night
	isDay := forecastTime.After(sunrise) && forecastTime.Before(sunset)
	if isDay {
		weather.Icon += "d"
	} else {
		weather.Icon += "n"
	}

	return weather
}