Added wind route and started forecast endpoint

model/windModel.go

@@ -0,0 +1,88 @@
+package model
+
+import (
+	"encoding/json"
+	"math"
+	"net/http"
+	"net/url"
+	"strconv"
+
+	"github.com/ceticamarco/zephyr/types"
+)
+
+func GetCardinalDir(windDeg float64) (string, string) {
+	// Each cardinal direction represents a segment of 22.5 degrees
+	cardinalDirections := [16][2]string{
+		{"N", "⬇️"},   // 0/360 DEG
+		{"NNE", "↙️"}, // 22.5 DEG
+		{"NE", "↙️"},  // 45 DEG
+		{"ENE", "↙️"}, // 67.5 DEG
+		{"E", "⬅️"},   // 90 DEG
+		{"ESE", "↖️"}, // 112.5 DEG
+		{"SE", "↖️"},  // 135 DEG
+		{"SSE", "↖️"}, // 157.5 DEG
+		{"S", "⬆️"},   // 180 DEG
+		{"SSW", "↗️"}, // 202.5 DEG
+		{"SW", "↗️"},  // 225 DEG
+		{"WSW", "↗️"}, // 247.5 DEG
+		{"W", "➡️"},   // 270 DEG
+		{"WNW", "↘️"}, // 292.5 DEG
+		{"NW", "↘️"},  // 315 DEG
+		{"NNW", "↘️"}, // 337.5 DEG
+	}
+
+	// Computes "idx ≡ round(wind_deg / 22.5) (mod 16)"
+	// to ensure that values above 360 degrees or below 0 degrees
+	// "stay bounded" to the map
+	idx := int(math.Round(windDeg/22.5)) % 16
+
+	return cardinalDirections[idx][0], cardinalDirections[idx][1]
+
+}
+
+func GetWind(city *types.City, apiKey string) (types.Wind, error) {
+	url, err := url.Parse(WTR_URL)
+	if err != nil {
+		return types.Wind{}, err
+	}
+
+	params := url.Query()
+	params.Set("lat", strconv.FormatFloat(city.Lat, 'f', -1, 64))
+	params.Set("lon", strconv.FormatFloat(city.Lon, 'f', -1, 64))
+	params.Set("appid", apiKey)
+	params.Set("units", "metric")
+	params.Set("exclude", "minutely,hourly,daily,alerts")
+
+	url.RawQuery = params.Encode()
+
+	res, err := http.Get(url.String())
+	if err != nil {
+		return types.Wind{}, err
+	}
+
+	defer res.Body.Close()
+
+	// Structures representing the JSON response
+	type CurrentRes struct {
+		Speed   float64 `json:"wind_speed"`
+		Degrees float64 `json:"wind_deg"`
+	}
+
+	type WindRes struct {
+		Current CurrentRes `json:"current"`
+	}
+
+	var windRes WindRes
+	if err := json.NewDecoder(res.Body).Decode(&windRes); err != nil {
+		return types.Wind{}, err
+	}
+
+	// Get cardinal direction and wind arrow
+	windDirection, windArrow := GetCardinalDir(windRes.Current.Degrees)
+
+	return types.Wind{
+		Arrow:     windArrow,
+		Direction: windDirection,
+		Speed:     strconv.FormatFloat(windRes.Current.Speed, 'f', 2, 64),
+	}, nil
+}