add temperature extraction

app/DataTypes.hs

@@ -64,3 +64,18 @@ weatherDecode jsonBody =
     case decode jsonBody :: Maybe WeatherResponse of
         Just decoded -> return decoded
         Nothing -> error "Invalid JSON"
+
+getTemperature :: WeatherResponse -> Float
+getTemperature (WeatherResponse _ Nothing Nothing) = error "No data provided!"
+getTemperature (WeatherResponse _ (Just curr) Nothing) = getTemperatureFromCurrent curr
+getTemperature (WeatherResponse _ Nothing (Just fore)) = getTemperatureFromForecastDay $ getForecastDayFromForecast fore
+getTemperature (WeatherResponse _ (Just _) (Just fore)) = getTemperatureFromForecastDay $ getForecastDayFromForecast fore
+
+getForecastDayFromForecast :: Forecast -> ForecastDay
+getForecastDayFromForecast (Forecast forecasts) = head forecasts
+
+getTemperatureFromCurrent :: Current -> Float
+getTemperatureFromCurrent (Current temp) = temp
+
+getTemperatureFromForecastDay :: ForecastDay -> Float
+getTemperatureFromForecastDay (ForecastDay (Day temp)) = temp

app/Main.hs

@@ -7,7 +7,6 @@ import Data.Time as T
 import Plot
 import qualified DataTypes as DT
 
-
 data WhichDay = Yesterday | Today | Tomorrow
     deriving (Show, Eq)
 
@@ -33,25 +32,22 @@ main = do
         let yesterdayDate = formatDate $ addDays (-1) currentDate
         let yesterdayRequest = apiRequestBuilder apiKey Yesterday city yesterdayDate
         yesterdayResponse <- httpLBS yesterdayRequest
-        print $ getResponseStatusCode yesterdayResponse
         yesterdayDecoded <- DT.weatherDecode $ getResponseBody yesterdayResponse
-        print yesterdayDecoded
+        print ("Yesterday's temperature: ", DT.getTemperature yesterdayDecoded)
 
         --request for today's weather
         let todayDate = formatDate currentDate
         let todayRequest = apiRequestBuilder apiKey Today city todayDate
         todayResponse <- httpLBS todayRequest
-        print $ getResponseStatusCode todayResponse
         todayDecoded <- DT.weatherDecode $ getResponseBody todayResponse
-        print todayDecoded
+        print ("Today's temperature: ", DT.getTemperature todayDecoded)
 
         --request for tomorrow's weather
         let tomorrowDate = formatDate $ addDays 1 currentDate
         let tomorrowRequest = apiRequestBuilder apiKey Tomorrow city tomorrowDate
         tomorrowResponse <- httpLBS tomorrowRequest
-        print $ getResponseStatusCode tomorrowResponse
         tomorrowDecoded <- DT.weatherDecode $ getResponseBody tomorrowResponse
-        print tomorrowDecoded
+        print ("Tomorrow's temperature: ", DT.getTemperature tomorrowDecoded)
 
 
 --apiKey is stored in an env variable, not something that should be pushed onto git