1 files changed, 132 insertions, 0 deletions
diff --git a/liust-50/cmd/liustatus/weather.go b/liust-50/cmd/liustatus/weather.go
new file mode 100644
index 0000000..c744f2f
--- /dev/null
+++ b/liust-50/cmd/liustatus/weather.go
@@ -0,0 +1,132 @@
+package main
+
+import (
+	"encoding/xml"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"strconv"
+	"time"
+)
+
+const (
+	baseURL   = "https://api.met.no/weatherapi"
+	userAgent = "liustatus/1.0"
+
+	// Prague coordinates.
+	lat      = 50.08804
+	lon      = 14.42076
+	altitude = 202
+)
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+type Weatherdata struct {
+	XMLName xml.Name `xml:"weatherdata"`
+	Product Product  `xml:"product"`
+}
+
+type Product struct {
+	Times []Time `xml:"time"`
+}
+
+type Time struct {
+	From     string   `xml:"from,attr"`
+	To       string   `xml:"to,attr"`
+	Location Location `xml:"location"`
+}
+
+type Location struct {
+	Temperature *Temperature `xml:"temperature"`
+}
+
+type Temperature struct {
+	Unit  string `xml:"unit,attr"`
+	Value string `xml:"value,attr"`
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// WeatherFetcher handles weather data retrieval.
+type WeatherFetcher struct {
+	client *http.Client
+}
+
+// NewWeatherFetcher creates a new weather fetcher instance.
+func NewWeatherFetcher() *WeatherFetcher {
+	return &WeatherFetcher{
+		client: &http.Client{Timeout: 30 * time.Second},
+	}
+}
+
+// fetchWeather retrieves the current temperature from the API.
+func (w *WeatherFetcher) fetchWeather() (string, error) {
+	url := fmt.Sprintf(
+		"%s/locationforecast/2.0/classic?lat=%.5f&lon=%.5f&altitude=%d",
+		baseURL, lat, lon, altitude)
+
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return "", err
+	}
+
+	req.Header.Set("User-Agent", userAgent)
+
+	resp, err := w.client.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("API returned status %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+
+	var weatherData Weatherdata
+	if err := xml.Unmarshal(body, &weatherData); err != nil {
+		return "", err
+	}
+
+	now := time.Now().UTC()
+	for _, t := range weatherData.Product.Times {
+		toTime, err := time.Parse("2006-01-02T15:04:05Z", t.To)
+		if err != nil || toTime.Before(now) {
+			continue
+		}
+		if t.Location.Temperature != nil {
+			temp, err := strconv.ParseFloat(t.Location.Temperature.Value, 64)
+			if err != nil {
+				continue
+			}
+			return fmt.Sprintf("%dﾟ", int(temp)), nil
+		}
+	}
+
+	return "", fmt.Errorf("no usable temperature data found")
+}
+
+// update fetches new weather data and returns it.
+func (w *WeatherFetcher) update() string {
+	temp, err := w.fetchWeather()
+	if err != nil {
+		log.Printf("Error fetching weather: %v", err)
+	}
+	return temp
+}
+
+// Run runs as a goroutine to periodically fetch weather data.
+func (w *WeatherFetcher) Run(interval time.Duration, output chan<- string) {
+	ticker := time.NewTicker(interval)
+	defer ticker.Stop()
+
+	output <- w.update()
+	for range ticker.C {
+		output <- w.update()
+	}
+}