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// Copyright © 2022 siddharth ravikumar <s@ricketyspace.net>
// SPDX-License-Identifier: ISC
package main
import (
"embed"
"flag"
"fmt"
"html/template"
"log"
"net/http"
"regexp"
"strconv"
"strings"
"time"
"ricketyspace.net/peach/nws"
)
// peach port. defaults to 8151
var peachPort = flag.Int("p", 8151, "Port to run peach on")
// peach listen address. set during init.
var peachAddr = ""
// holds static content.
//go:embed templates static
var peachFS embed.FS
// html templates.
var peachTemplates = template.Must(template.ParseFS(peachFS, "templates/*.tmpl"))
// lat,long regex.
var latLngRegex = regexp.MustCompile(`/(-?[0-9]+\.?[0-9]+?),(-?[0-9]+\.?[0-9]+)`)
type Weather struct {
Title string
Location string
Now WeatherNow
Period WeatherPeriod
Timeline WeatherTimeline
}
type WeatherNow struct {
Temperature int
TemperatureUnit string
Forecast string
WindSpeed string
WindDirection string
}
type WeatherPeriod struct {
Forecast string
Hour int
Temperature int
TemperatureUnit string
}
type WeatherTimeline struct {
Periods []WeatherPeriod
}
func init() {
flag.Parse()
if *peachPort < 80 {
log.Fatalf("port number is invalid: %v", *peachPort)
}
peachAddr = fmt.Sprintf(":%d", *peachPort)
}
func main() {
// static files handler.
http.Handle("/static/", http.FileServer(http.FS(peachFS)))
// default handler.
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/" {
http.Redirect(w, r, "/41.115,-83.177", 302)
return
}
m := latLngRegex.FindStringSubmatch(r.URL.Path)
if len(m) != 3 || m[0] != r.URL.Path {
http.NotFound(w, r)
return
}
lat, err := strconv.ParseFloat(m[1], 32)
if err != nil {
http.Error(w, err.Error(), 400)
}
lng, err := strconv.ParseFloat(m[2], 32)
if err != nil {
http.Error(w, err.Error(), 400)
}
showWeather(w, float32(lat), float32(lng))
})
log.Fatal(http.ListenAndServe(peachAddr, nil))
}
func showWeather(w http.ResponseWriter, lat, lng float32) {
point, err := nws.Points(lat, lng)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
// get forecast
f, err := nws.Forecast(point)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
fh, err := nws.ForecastHourly(point)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
// make weather
weather, err := NewWeather(point, f, fh)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
// render.
err = peachTemplates.ExecuteTemplate(w, "weather.tmpl", weather)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
}
func NewWeather(point *nws.NWSPoint, f, fh *nws.NWSForecast) (*Weather, error) {
w := new(Weather)
w.Location = fmt.Sprintf("%s, %s",
strings.ToLower(point.Properties.RelativeLocation.Properties.City),
strings.ToLower(point.Properties.RelativeLocation.Properties.State),
)
w.Title = w.Location
w.Now = WeatherNow{
Temperature: fh.Properties.Periods[0].Temperature,
TemperatureUnit: fh.Properties.Periods[0].TemperatureUnit,
Forecast: fh.Properties.Periods[0].ShortForecast,
WindSpeed: fh.Properties.Periods[0].WindSpeed,
WindDirection: fh.Properties.Periods[0].WindDirection,
}
w.Period = WeatherPeriod{
Forecast: f.Properties.Periods[0].DetailedForecast,
}
// build timeline.
periods := []WeatherPeriod{}
max := 6
for i, period := range fh.Properties.Periods {
if i%2 != 0 {
continue // take every other period
}
t, err := time.Parse(time.RFC3339, period.StartTime)
if err != nil {
return nil, err
}
p := WeatherPeriod{
Forecast: period.DetailedForecast,
Hour: t.Hour(),
Temperature: period.Temperature,
TemperatureUnit: period.TemperatureUnit,
}
periods = append(periods, p)
if len(periods) == max {
break
}
}
w.Timeline = WeatherTimeline{
Periods: periods,
}
return w, nil
}
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