Added weather route and embedded cache system

model/weatherModel.go

@@ -0,0 +1,155 @@
+package model
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/ceticamarco/zephyr/types"
+)
+
+const (
+	GEO_URL = "https://api.openweathermap.org/geo/1.0/direct"
+	WTR_URL = "https://api.openweathermap.org/data/3.0/onecall"
+)
+
+func getEmoji(condition string, isNight bool) string {
+	switch condition {
+	case "Thunderstorm":
+		return "⛈️"
+	case "Drizzle":
+		return "🌦️"
+	case "Rain":
+		return "🌧️"
+	case "Snow":
+		return "☃️"
+	case "Mist", "Smoke", "Haze", "Dust", "Fog", "Sand", "Ash", "Squall":
+		return "🌫️"
+	case "Tornado":
+		return "🌪️"
+	case "Clear":
+		{
+			if isNight {
+				return "🌙"
+			} else {
+				return "☀️"
+			}
+		}
+	case "Clouds":
+		return "☁️"
+	case "SunWithCloud":
+		return "🌤️"
+	case "CloudWithSun":
+		return "🌥️"
+	}
+
+	return "❓"
+}
+
+func GetCoordinates(cityName string, apiKey string) (types.City, error) {
+	url, err := url.Parse(GEO_URL)
+	if err != nil {
+		return types.City{}, err
+	}
+
+	params := url.Query()
+	params.Set("q", cityName)
+	params.Set("limit", "1")
+	params.Set("appid", apiKey)
+
+	url.RawQuery = params.Encode()
+
+	res, err := http.Get(url.String())
+	if err != nil {
+		return types.City{}, err
+	}
+
+	var geoArr []types.City
+	if err := json.NewDecoder(res.Body).Decode(&geoArr); err != nil {
+		return types.City{}, err
+	}
+
+	if len(geoArr) == 0 {
+		return types.City{}, errors.New("Cannot find this city")
+	}
+
+	return types.City{
+		Name: geoArr[0].Name,
+		Lat:  geoArr[0].Lat,
+		Lon:  geoArr[0].Lon,
+	}, nil
+}
+
+func GetWeather(city *types.City, apiKey string) (types.Weather, error) {
+	url, err := url.Parse(WTR_URL)
+	if err != nil {
+		return types.Weather{}, err
+	}
+
+	params := url.Query()
+	params.Set("lat", strconv.FormatFloat(city.Lat, 'E', -1, 64))
+	params.Set("lon", strconv.FormatFloat(city.Lon, 'E', -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.Weather{}, err
+	}
+
+	// Structures representing the JSON response
+	type InfoRes struct {
+		Title       string `json:"main"`
+		Description string `json:"description"`
+		Icon        string `json:"icon"`
+	}
+	type CurrentRes struct {
+		FeelsLike   float64   `json:"feels_like"`
+		Temperature float64   `json:"temp"`
+		Timestamp   int64     `json:"dt"`
+		Weather     []InfoRes `json:"weather"`
+	}
+	type WeatherRes struct {
+		Current CurrentRes `json:"current"`
+	}
+
+	var weather WeatherRes
+	if err := json.NewDecoder(res.Body).Decode(&weather); err != nil {
+		return types.Weather{}, err
+	}
+
+	// Format UNIX timestamp as 'YYYY-MM-DD'
+	// unixTs, _ := strconv.Atoi(weather.Current.Timestamp)
+	utcTime := time.Unix(int64(weather.Current.Timestamp), 0)
+	weatherDate := utcTime.UTC()
+
+	// Set condition accordingly to weather description
+	var condition string
+	switch weather.Current.Weather[0].Description {
+	case "few clouds":
+		condition = "SunWithCloud"
+	case "broken clouds":
+		condition = "CloudWithSun"
+	default:
+		condition = weather.Current.Weather[0].Title
+	}
+
+	// Get emoji from weather condition
+	isNight := strings.HasSuffix(weather.Current.Weather[0].Icon, "n")
+	emoji := getEmoji(condition, isNight)
+
+	return types.Weather{
+		Date:        weatherDate,
+		Temperature: strconv.FormatFloat(weather.Current.Temperature, 'E', -1, 64),
+		FeelsLike:   strconv.FormatFloat(weather.Current.FeelsLike, 'E', -1, 64),
+		Condition:   weather.Current.Weather[0].Title,
+		Emoji:       emoji,
+	}, nil
+}