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