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package main
// BUG: need to allow choice of met-office source (-b 0 doesn't work how i thought it would)
// TODO: allow free-text lookups of place names, rather than ids
// TODO: convert metoffice windspeed to mph
// TODO: split output into days
// TODO: add -n flag to only output a certain number of days
// TODO: human friendly dates
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
)
const metdefid = "310118"
const bbcdefid = "2654675"
const meturl = "https://www.metoffice.gov.uk/public/data/PWSCache/BestForecast/Forecast/%s.json?concise=true"
const bbcurl = "https://weather-broker-cdn.api.bbci.co.uk/en/forecast/aggregated/%s"
// BBC structures
type BBCResponse struct {
Forecasts []struct {
Detailed struct {
Reports []Report
}
}
}
type Report struct {
EnhancedWeatherDescription string
ExtendedWeatherType int
FeelsLikeTemperatureC int
FeelsLikeTemperatureF int
GustSpeedKph int
GustSpeedMph int
Humidity int
LocalDate string
PrecipitationProbabilityInPercent int
PrecipitationProbabilityText string
Pressure int
TemperatureC int
TemperatureF int
Timeslot string
TimeslotLength int
Visibility string
WeatherType int
WeatherTypeText string
WindDescription string
WindDirection string
WindDirectionAbbreviation string
WindDirectionFull string
WindSpeedKph int
WindSpeedMph int
}
// Met Office structures
type MetResponse struct {
BestFcst struct {
Forecast struct {
Location struct {
Days []Day `json:"Day"`
}
}
}
}
type Day struct {
Date string `json:"@date"`
DayValues struct {
WeatherParameters WeatherParams
}
NightValues struct {
WeatherParameters WeatherParams
}
TimeSteps struct {
TimeStep []struct {
Time string `json:"@time"`
WeatherParameters WeatherParams
}
}
}
type WeatherParams struct {
AQIndex int // Air Quality
F float64 // Feels Like Temperature
H int // Humidity
P int // Pressure
PP int // Precipitation Probability
T float64 // Temperature
UV int // Max UV Index
V int // Visibility
WD string // Wind Direction
WG float64 // Wind Gust
WS float64 // Wind Speed
WT int // Weather Type
}
// TODO: complete this mapping
var TypeDescription = map[int]string{
0: "Clear Sky",
1: "Sunny",
2: "Partly Cloudy",
3: "Sunny Intervals",
5: "Mist",
7: "Light Cloud",
8: "Thick Cloud",
9: "Light Rain Showers",
10: "Light Rain Showers",
11: "Drizzle",
12: "Light Rain",
14: "Heavy Rain Showers",
15: "Heavy Rain",
18: "Sleet",
19: "Hail Showers",
20: "Hail Showers",
28: "Thundery Showers",
29: "Thundery Showers",
}
// Our prefered struct
type Weather struct {
date string
time string
temperature float64
precipitation int
weathertype int
windspeed float64
}
var (
src = flag.String("s", "bbc", "data source provider (valid options: 'bbc', 'metoffice')")
numdays = flag.Int("n", 2, "number of days to show")
verbose = flag.Bool("v", false, "verbose: show all weather details")
)
func processBBC(b []byte) []Weather {
var r BBCResponse
var weather []Weather
var w Weather
err := json.Unmarshal(b, &r)
if err != nil {
log.Fatal(err)
}
for _, f := range r.Forecasts {
for _, report := range f.Detailed.Reports {
w.date = report.LocalDate
w.time = report.Timeslot
w.temperature = float64(report.TemperatureC)
w.precipitation = report.PrecipitationProbabilityInPercent
w.weathertype = report.WeatherType
w.windspeed = float64(report.WindSpeedMph)
weather = append(weather, w)
}
}
return weather
}
func processMet(b []byte) []Weather {
var r MetResponse
var weather []Weather
var w Weather
err := json.Unmarshal(b, &r)
if err != nil {
log.Fatal(err)
}
for _, d := range r.BestFcst.Forecast.Location.Days {
w.date = d.Date
w.time = "Day "
w.temperature = d.DayValues.WeatherParameters.T
w.precipitation = d.DayValues.WeatherParameters.PP
w.weathertype = d.DayValues.WeatherParameters.WT
w.windspeed = d.DayValues.WeatherParameters.WS
weather = append(weather, w)
w.date = d.Date
w.time = "Night "
w.temperature = d.DayValues.WeatherParameters.T
w.precipitation = d.DayValues.WeatherParameters.PP
w.weathertype = d.DayValues.WeatherParameters.WT
w.windspeed = d.DayValues.WeatherParameters.WS
weather = append(weather, w)
for _, t := range d.TimeSteps.TimeStep {
w.date = d.Date
w.time = t.Time
w.temperature = t.WeatherParameters.T
w.precipitation = t.WeatherParameters.PP
w.weathertype = t.WeatherParameters.WT
w.windspeed = t.WeatherParameters.WS
weather = append(weather, w)
}
}
return weather
}
func main() {
var err error
var id string
var url string
var parsefunc func([]byte) []Weather
var resp *http.Response
var weather []Weather
flag.Parse()
switch *src {
case "bbc":
id = bbcdefid
url = bbcurl
parsefunc = processBBC
case "metoffice":
id = metdefid
url = meturl
parsefunc = processMet
default:
log.Fatalf("data source %s not supported; use either 'bbc' or 'metoffice'\n", *src)
}
if flag.NArg() > 0 {
id = flag.Arg(0)
}
resp, err = http.Get(fmt.Sprintf(url, id))
if err != nil {
log.Fatal(err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
log.Fatalf("HTTP status code: %d\n", resp.StatusCode)
}
b, err := ioutil.ReadAll(resp.Body)
weather = parsefunc(b)
for _, w := range weather {
fmt.Printf("%s %s ", w.date, w.time)
desc, ok := TypeDescription[w.weathertype]
if !ok {
desc = fmt.Sprintf("%d", w.weathertype)
}
fmt.Printf("%18s, Temp: %4.1f°C, ", desc, w.temperature)
fmt.Printf("Rain: %2d%%, Wind: %4.1fmph\n", w.precipitation, w.windspeed)
if *verbose {
fmt.Printf(" %+v\n", w)
}
}
}
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