weather-cli/cmd/main.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strings"

	"github.com/joho/godotenv"
)

const version string = "0.2.0"

type weatherMain struct {
	Temp      float32 `json:"temp"`
	FeelsLike float32 `json:"feels_like"`
	HighTemp  float32 `json:"temp_max"`
	LowTemp   float32 `json:"temp_min"`
	Pressure  uint    `json:"pressure"`
	Humidity  uint    `json:"humidity"`
}

type weatherWind struct {
	Speed float32 `json:"speed"`
	Gust  float32 `json:"gust"`
}

type forecast struct {
	//Overview weatherOverview `json:"weather"`
	Main weatherMain `json:"main"`
	Wind weatherWind `json:"wind"`
}

type config struct {
	Units     string `json:"units"`
	Location  string `json:"loc"`
	Longitude string `json:"lat"`
	Latitude  string `json:"lon"`
	ApiKey    string `json:"appid"`
}

type application struct {
	Forecast forecast
	Config   config
	Version  string
}

func main() {

	// Load .env
	err := godotenv.Load()
	if err != nil {
		log.Fatalln(err)
	}

	// Read API_KEY from .env and create app
	cfg := config{
		Units:  "imperial",
		ApiKey: os.Getenv("API_KEY"),
	}

	fcst := forecast{}

	app := application{
		Config:   cfg,
		Forecast: fcst,
		Version:  version,
	}

	// Display main menu
	fmt.Println("\n=====================================================")
	fmt.Printf("| Welcome to the OpenWeatherMap-gRPC Client! v%s |\n", app.Version)
	fmt.Println("=====================================================")

	fmt.Printf("New in version %s:\n", app.Version)
	fmt.Println(" - Advanced option: Get historical data back to 1972")
	fmt.Println("New in version 0.1.0")
	fmt.Println(" - Default option: Automatically determine location")
	fmt.Println(" - Advanced option: Enter exact location for anywhere in the world")
	fmt.Println(" - Advanced option: Change back and forth between imperial and metric units of measurement")

	var option string
	// Menu loop
	for option != "0" {
		fmt.Print("\nMain Menu\n---------\n\n")
		fmt.Println("1. Today's forecast (use current location, default)")
		fmt.Println("2. Advanced options (Change units, precise location, etc.)")
		fmt.Print("0. Exit\n\n")

		// Read user input
		reader := bufio.NewReader(os.Stdin)
		input, err := reader.ReadString('\n')
		if err != nil {
			log.Println(err)
		}
		option = strings.TrimSuffix(input, "\n")

		// Check user input
		if option == "1" || option == "" {
			getLocation(&app)
			getCurrent(&app)
			printWeather(&app)
		} else if option == "2" {
			advancedMenu(&app)
		} else if option == "0" {
			return
		} else {
			fmt.Print("\nOops! An error occurred, please choose a valid option.\n\n")
		}
	}

}