From 1f3721774bf918a2569e4fefe9ce5fdf70f99286 Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.name>
Date: Wed, 21 Mar 2018 20:47:27 +0000
Subject: Use structs to unmarshall the json into, working well

---
 weather.go | 65 +++++++++++++++++++++++++++-----------------------------------
 1 file changed, 28 insertions(+), 37 deletions(-)

diff --git a/weather.go b/weather.go
index b81cc9f..56d6bdf 100644
--- a/weather.go
+++ b/weather.go
@@ -12,7 +12,6 @@ import (
 	"io/ioutil"
 	"log"
 	"net/http"
-	"sort"
 )
 
 const defid = "310118"
@@ -34,24 +33,31 @@ var wkey = map[string]string{
 
 type Response struct {
 	BestFcst struct {
-		Location struct {
-			Days []Day `json:"Day"`
+		Forecast struct {
+			Location struct {
+				Days []Day `json:"Day"`
+			}
 		}
 	}
 }
 
 type Day struct {
-	DayValues   WeatherParam
-	NightValues WeatherParam
-	TimeSteps   struct {
-		TimeStep struct {
-			Time          string `json:"@time"`
-			WeatherParams []WeatherParam
+	Date      string `json:"@date"`
+	DayValues struct {
+		WeatherParameters WeatherParams
+	}
+	NightValues struct {
+		WeatherParameters WeatherParams
+	}
+	TimeSteps struct {
+		TimeStep []struct {
+			Time              string `json:"@time"`
+			WeatherParameters WeatherParams
 		}
 	}
 }
 
-type WeatherParam struct {
+type WeatherParams struct {
 	AQIndex float64
 	F       float64
 	H       float64
@@ -67,7 +73,7 @@ type WeatherParam struct {
 }
 
 func main() {
-	var j map[string]interface{}
+	var r Response
 	var id string
 
 	flag.Parse()
@@ -77,7 +83,6 @@ func main() {
 		id = defid
 	}
 
-	// Use http.Client.Get as http.Get doesn't seem to handle TLS
 	client := &http.Client{Transport: &http.Transport{}}
 	resp, err := client.Get("https://www.metoffice.gov.uk/public/data/PWSCache/BestForecast/Forecast/" + id + ".json?concise=true")
 	if err != nil {
@@ -85,42 +90,28 @@ func main() {
 	}
 	defer resp.Body.Close()
 	b, err := ioutil.ReadAll(resp.Body)
-	err = json.Unmarshal(b, &j)
+	err = json.Unmarshal(b, &r)
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	// TODO: make this cleaner, perhaps by pre-speccing the structs
-	days := j["BestFcst"].(map[string]interface{})["Forecast"].(map[string]interface{})["Location"].(map[string]interface{})["Day"].([]interface{})
-	for _, d := range days {
+	for _, d := range r.BestFcst.Forecast.Location.Days {
 		fmt.Printf("-----------------------------\n")
-		fmt.Printf("Date: %v\n", d.(map[string]interface{})["@date"])
+		fmt.Printf("Date: %v\n", d.Date)
 		fmt.Printf("\nDay weather:\n")
-		prettyWeather(d.(map[string]interface{})["DayValues"].(map[string]interface{})["WeatherParameters"].(map[string]interface{}))
+		prettyWeather(d.DayValues.WeatherParameters)
 		fmt.Printf("\nNight weather:\n")
-		prettyWeather(d.(map[string]interface{})["NightValues"].(map[string]interface{})["WeatherParameters"].(map[string]interface{}))
+		prettyWeather(d.NightValues.WeatherParameters)
 
 		fmt.Printf("\nTime steps:\n")
-		timesteps := d.(map[string]interface{})["TimeSteps"].(map[string]interface{})["TimeStep"].([]interface{})
-		for _, t := range timesteps {
-			fmt.Printf("\nTime: %s\n", t.(map[string]interface{})["@time"])
-			prettyWeather(t.(map[string]interface{})["WeatherParameters"].(map[string]interface{}))
+		for _, t := range d.TimeSteps.TimeStep {
+			fmt.Printf("\nTime: %s\n", t.Time)
+			prettyWeather(t.WeatherParameters)
 		}
 	}
 }
 
-func prettyWeather(w map[string]interface{}) {
-	// TODO: choose what to show, and in what order, to have a compact output
-	var keys []string
-	for k, _ := range wkey {
-		keys = append(keys, k)
-	}
-	sort.Strings(keys)
-
-	for _, k := range keys {
-		t, ok := w[k]
-		if ok {
-			fmt.Printf("%s: %v\n", wkey[k], t)
-		}
-	}
+func prettyWeather(w WeatherParams) {
+	// TODO: Print weather nicely
+	fmt.Printf("%+v\n", w)
 }
-- 
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