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// converter.go - Converts ForecastData to OWMResponse
package main
import (
"fmt"
"math"
"time"
)
// ToOWMResponse converts ForecastData to OWMResponse format
func (fd *ForecastData) ToOWMResponse(mapper *WeatherMapper) (*OWMResponse, error) {
loc, err := time.LoadLocation(fd.Timezone)
if err != nil {
return nil, fmt.Errorf("loading timezone: %w", err)
}
// Calculate timezone offset
firstTime := time.Unix(fd.Timestamps[0], 0).UTC()
_, offset := firstTime.In(loc).Zone()
// Create response
response := &OWMResponse{
Lat: fd.Latitude,
Lon: fd.Longitude,
Timezone: fd.Timezone,
TimezoneOffset: offset,
}
// Calculate sunrise/sunset for first day
sunCalc := NewSunCalculator(fd.Latitude, fd.Longitude, float64(offset)/3600)
sunrise, sunset, err := sunCalc.Calculate(firstTime)
if err != nil {
// Use defaults if calculation fails
sunrise = firstTime.Add(8 * time.Hour)
sunset = firstTime.Add(16 * time.Hour)
}
// Convert each forecast point
hourly := make([]Current, 0, len(fd.Timestamps))
for i, timestamp := range fd.Timestamps {
current, err := fd.convertToCurrent(i, timestamp, loc, sunrise, sunset, mapper)
if err != nil {
return nil, fmt.Errorf("converting point %d: %w", i, err)
}
hourly = append(hourly, current)
}
response.Current = hourly[0]
response.Current.Sunrise = sunrise.Unix()
response.Current.Sunset = sunset.Unix()
response.Hourly = hourly
return response, nil
}
func (fd *ForecastData) convertToCurrent(index int, timestamp int64, loc *time.Location, sunrise, sunset time.Time, mapper *WeatherMapper) (Current, error) {
current := Current{
Dt: timestamp,
Uvi: 0, // Not available from FMI
}
// Add ISO 8601 local time
current.LocalTime = time.Unix(timestamp, 0).In(loc).Format(time.RFC3339)
// Extract temperature
if val, err := fd.getFloatValue(index, "Temperature"); err == nil && !math.IsNaN(val) {
current.Temp = val
}
// Extract humidity
if val, err := fd.getFloatValue(index, "Humidity"); err == nil && !math.IsNaN(val) {
current.Humidity = int(math.Round(val))
}
// Extract pressure
if val, err := fd.getFloatValue(index, "Pressure"); err == nil && !math.IsNaN(val) {
current.Pressure = int(math.Round(val))
}
// Extract dew point
if val, err := fd.getFloatValue(index, "dewPoint"); err == nil && !math.IsNaN(val) {
current.DewPoint = val
}
// Extract wind speed
if val, err := fd.getFloatValue(index, "WindSpeedMS"); err == nil && !math.IsNaN(val) {
current.WindSpeed = val
}
// Extract wind direction
if val, err := fd.getFloatValue(index, "WindDirection"); err == nil && !math.IsNaN(val) {
current.WindDeg = int(math.Round(val))
}
// Extract wind gust
if val, err := fd.getFloatValue(index, "WindGust"); err == nil && !math.IsNaN(val) {
current.WindGust = val
}
// Extract cloud cover
if val, err := fd.getFloatValue(index, "TotalCloudCover"); err == nil && !math.IsNaN(val) {
current.Clouds = int(math.Round(val))
}
// Extract visibility
if val, err := fd.getFloatValue(index, "visibility"); err == nil && !math.IsNaN(val) {
current.Visibility = int(math.Round(val))
}
// Calculate feels-like temperature
current.FeelsLike = CalculateFeelsLike(current.Temp, float64(current.Humidity), current.WindSpeed)
// Handle precipitation
if val, err := fd.getFloatValue(index, "PrecipitationRate"); err == nil && !math.IsNaN(val) && val > 0 {
current.Rain = &Rain{OneH: val}
}
// Map weather symbol
if val, err := fd.getFloatValue(index, "WeatherSymbol3"); err == nil && !math.IsNaN(val) {
symbol := int(math.Round(val))
forecastTime := time.Unix(timestamp, 0)
current.Weather = []Weather{mapper.Map(symbol, forecastTime, sunrise, sunset)}
} else {
// Default weather
current.Weather = []Weather{{800, "Clear", "clear sky", "01d"}}
}
return current, nil
}
func (fd *ForecastData) getFloatValue(rowIndex int, paramName string) (float64, error) {
if paramIndex, ok := fd.ParamIndex[paramName]; ok {
if rowIndex < len(fd.Values) && paramIndex < len(fd.Values[rowIndex]) {
return fd.Values[rowIndex][paramIndex], nil
}
}
return math.NaN(), fmt.Errorf("parameter %s not found or out of bounds", paramName)
}
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