flokati/modules/weather.go

// vi:ts=4:sts=4:sw=4:noet:tw=72
//
// flokatirc weather module
//
// Copyright (c) 2016 Daniel Aberger <da@ixab.de>

package modules

import (
	"encoding/json"
	"flag"
	"fmt"
	"io/ioutil"
	"net/http"
	"strconv"
	"strings"
	"time"

	"code.dnix.de/an/xlog"
)

var (
	weatherApiKey = flag.String("weather_api_key", "", "MOD: weather: api key")
)

var (
	owmQueryAPIKey    = ""
	owmQueryURLPrefix = "http://api.openweathermap.org/data/2.5/weather?q="
	owmQueryURLSuffix = "&appid="
	weatherPrefix     = "[WTHR] "
)

type WeatherObject struct {
	Base   string `json:"base"`
	Clouds struct {
		All int `json:"all"`
	} `json:"clouds"`
	Cod   int `json:"cod"`
	Coord struct {
		Lat float64 `json:"lat"`
		Lon float64 `json:"lon"`
	} `json:"coord"`
	Dt   int `json:"dt"`
	ID   int `json:"id"`
	Main struct {
		GrndLevel float64 `json:"grnd_level"`
		Humidity  int     `json:"humidity"`
		Pressure  float64 `json:"pressure"`
		SeaLevel  float64 `json:"sea_level"`
		Temp      float64 `json:"temp"`
		TempMax   float64 `json:"temp_max"`
		TempMin   float64 `json:"temp_min"`
	} `json:"main"`
	Name string `json:"name"`
	Rain struct {
		ThreeH float64 `json:"3h"`
	} `json:"rain"`
	Sys struct {
		Country string  `json:"country"`
		Message float64 `json:"message"`
		Sunrise int     `json:"sunrise"`
		Sunset  int     `json:"sunset"`
	} `json:"sys"`
	Weather []struct {
		Description string `json:"description"`
		Icon        string `json:"icon"`
		ID          int    `json:"id"`
		Main        string `json:"main"`
	} `json:"weather"`
	Wind struct {
		Deg   float64 `json:"deg"`
		Speed float64 `json:"speed"`
	} `json:"wind"`
}

func init() {
	MsgFuncs["weather"] = weatherHandleMessage
	RunFuncs["weather"] = weatherConfig
}

func weatherConfig() {
	time.Sleep(5 * time.Second)
	owmQueryAPIKey = *weatherApiKey
}

func weatherHandleMessage(m *Message) {
	tok := strings.Split(m.Text, " ")
	if len(tok) < 1 {
		return
	}
	switch strings.ToLower(tok[0]) {
	case "!weather", "!wetter":
		switch len(tok) {
		case 1:
			SayCh <- fmt.Sprintf("%s\n%s", m.Channel, weatherPrefix+"Usage: !w <zip/city/state/country>")
		default:
			if strings.Compare(owmQueryAPIKey, "") == 0 {
				SayCh <- fmt.Sprintf("%s\n%s", m.Channel, weatherPrefix+"No API Key set.")
			} else {
				go getWeather(strings.Join(tok[1:], " "), m.Channel)
			}
		}
	default:
	}
}

func getWeather(query, channel string) {
	q := owmQueryURLPrefix + query + owmQueryURLSuffix + owmQueryAPIKey
	r, err := http.Get(q)
	if err != nil {
		xlog.Error(err.Error())
		SayCh <- fmt.Sprintf("%s\n%s", channel, weatherPrefix+err.Error())
	} else {
		re, err := ioutil.ReadAll(r.Body)
		if err != nil {
			xlog.Error(err.Error())
			SayCh <- fmt.Sprintf("%s\n%s", channel, weatherPrefix+err.Error())
		} else {
			defer r.Body.Close()
			var wo WeatherObject
			err := json.Unmarshal(re, &wo)
			if err != nil {
				xlog.Error(err.Error())
				SayCh <- fmt.Sprintf("%s\n%s", channel, weatherPrefix+err.Error())
			} else {
				var description string
				if len(wo.Weather) < 1 {
					description = ""
				} else {
					description = ", " + wo.Weather[0].Description
				}
				SayCh <- fmt.Sprintf("%s\n%s", channel, weatherPrefix+wo.Name+", "+wo.Sys.Country+
					" - Temp: "+strconv.Itoa(int(wo.Main.Temp-273.15))+
					"°C"+description+
					", Humidity: "+strconv.Itoa(int(wo.Main.Humidity))+
					"%, Wind: "+strconv.Itoa(int(wo.Wind.Speed*3.6))+
					" km/h")
			}
		}
	}
}