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package main
// TODO: allow free-text lookups of place names, rather than ids
// TODO: decode weather type number
// TODO: split out met office specific stuff to separate module
// TODO: add other weather providers
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"sort"
)
const defid = "310118"
var wkey = map[string]string{
"f": "Feels Like Temperature",
"h": "Humidity",
"p": "Pressure",
"t": "Temperature",
"v": "Visibility",
"wg": "Wind Gust",
"ws": "Wind Speed",
"pp": "Precipitaton Probability",
"uv": "Max UV Index",
"wd": "Wind Direction",
"wt": "Weather Type",
"AQIndex": "Air Quality",
}
type Response struct {
BestFcst struct {
Location struct {
Days []Day `json:"Day"`
}
}
}
type Day struct {
DayValues WeatherParam
NightValues WeatherParam
TimeSteps struct {
TimeStep struct {
Time string `json:"@time"`
WeatherParams []WeatherParam
}
}
}
type WeatherParam struct {
AQIndex float64
F float64
H float64
P float64
PP float64
UV float64
T float64
V float64
WD string
WG float64
WS float64
WT float64
}
func main() {
var j map[string]interface{}
var id string
flag.Parse()
if flag.NArg() > 0 {
id = flag.Arg(0)
} else {
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 {
log.Fatal(err)
}
defer resp.Body.Close()
b, err := ioutil.ReadAll(resp.Body)
err = json.Unmarshal(b, &j)
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 {
fmt.Printf("-----------------------------\n")
fmt.Printf("Date: %v\n", d.(map[string]interface{})["@date"])
fmt.Printf("\nDay weather:\n")
prettyWeather(d.(map[string]interface{})["DayValues"].(map[string]interface{})["WeatherParameters"].(map[string]interface{}))
fmt.Printf("\nNight weather:\n")
prettyWeather(d.(map[string]interface{})["NightValues"].(map[string]interface{})["WeatherParameters"].(map[string]interface{}))
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{}))
}
}
}
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)
}
}
}
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