feat: add OpenMeteo support

src/main/java/eirb/pg203/Main.java

@@ -6,9 +6,11 @@ public class Main {
     public static void main(String[] args) throws IOException {
 		String APIKey = "cef8e1b6ea364994b5072423240111";
 		WeatherAPI weatherAPI = new WeatherAPI(APIKey);
+		OpenMeteo openMeteo = new OpenMeteo();
 		WeatherDisplay display = new WeatherDisplayBasic();
 
 		display.addAPI(weatherAPI);
+		display.addAPI(openMeteo);
 
 		display.display(5, "Bordeaux");
     }

src/main/java/eirb/pg203/OpenMeteo.java

@@ -0,0 +1,63 @@
+package eirb.pg203;
+
+import org.json.JSONObject;
+
+import eirb.pg203.utils.JSONFetcher;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.URL;
+import java.time.Instant;
+import java.util.ArrayList;
+
+// https://api.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&hourly=temperature_2m
+
+public class OpenMeteo implements WeatherDataAPI {
+	private static final String forecastBaseURL = "https://api.open-meteo.com/v1/forecast";
+
+  private JSONObject fetchWeather(int days, City city) throws IOException {
+    URL url = URI.create(
+        String.format(forecastBaseURL + "?latitude=%.2f&longitude=%.2f&forecast_days=%d&daily=apparent_temperature_min,apparent_temperature_max",
+					city.getCityCoords().getLat(),
+					city.getCityCoords().getLon(),
+					days
+        )
+    ).toURL();
+
+    return JSONFetcher.fetch(url);
+  }
+
+  /**
+   * @param day Day, 0 ≤ day ≤ 14
+   */
+  @Override
+  public Temperature getTemperature(int day, String city) throws IOException {
+    JSONObject result = fetchWeather(day+1, new City(city));
+    JSONObject daily = result.getJSONObject("daily");
+    float temp_c = (daily.getJSONArray("apparent_temperature_max").getFloat(0) + daily.getJSONArray("apparent_temperature_min").getFloat(0)) / 2;
+
+    return new Temperature(temp_c, new City(city), Instant.now());
+  }
+
+  @Override
+  public Temperature getTemperature(int day, int hour, String city) throws IOException{
+    return getTemperature(day, city);
+  }
+
+  @Override
+  public ArrayList<Temperature> getTemperatures(int days, String city) throws IOException {
+    JSONObject result = fetchWeather(days, new City(city));
+    ArrayList<Temperature> temperatures = new ArrayList<>();
+		JSONObject daily = result.getJSONObject("daily");
+    for (int day = 0; day < days; ++day) {
+			float temp_c = (daily.getJSONArray("apparent_temperature_max").getFloat(day) + daily.getJSONArray("apparent_temperature_min").getFloat(day)) / 2;
+      temperatures.add(new Temperature(temp_c, new City(city), Instant.now()));
+    }
+    return temperatures;
+  }
+
+  @Override
+  public String getAPIName() {
+    return "OpenMeteo";
+  }
+}