yr/cmd/forecast.go

package cmd

import (
	"encoding/json"
	"fmt"
	"os"
	"time"

	"git.sr.ht/~timharek/yr-go/cmd/flags"
	"git.sr.ht/~timharek/yr-go/internal/nominatim"
	"git.sr.ht/~timharek/yr-go/yr"
	"github.com/charmbracelet/lipgloss"
	"github.com/charmbracelet/lipgloss/table"
	"github.com/spf13/cobra"
)

var forecastCmd = &cobra.Command{
	Use:     "forecast <location>",
	Aliases: []string{"f", "ls"},
	Short:   "Get forecasted weather",
	Args:    cobra.MaximumNArgs(1),
	Run:     forecast,
}

func init() {
	rootCmd.AddCommand(forecastCmd)
	rootCmd.PersistentFlags().IntP(flags.INTERVAL, "i", 0, "Number of hours to output")
}

func forecast(cmd *cobra.Command, args []string) {
	isJson, err := cmd.Flags().GetBool(flags.JSON)
	cobra.CheckErr(err)
	lon, _ := cmd.Flags().GetFloat64(flags.LON)
	lat, _ := cmd.Flags().GetFloat64(flags.LAT)
	interval, _ := cmd.Flags().GetInt(flags.INTERVAL)

	c, err := yr.New()
	cobra.CheckErr(err)

	if len(args) == 0 && (lon == 0 || lat == 0) {
		fmt.Fprintln(os.Stderr, "No location or coordinates provided.")
		os.Exit(1)
	}
	var f []yr.Forecast
	if len(args) == 0 {
		f, err = c.ForecastCoords(&nominatim.Coordinates{Longitude: lon, Latitude: lat}, nil)
		cobra.CheckErr(err)
	} else {
		location := args[0]
		f, err = c.Forecast(location)
		cobra.CheckErr(err)
	}

	if interval > 0 {
		f = f[:interval]
	}

	if isJson {
		j, err := json.MarshalIndent(f, "", "  ")
		cobra.CheckErr(err)
		fmt.Printf("%s", j)
		return
	}

	re := lipgloss.NewRenderer(os.Stdout)

	const (
		white     = lipgloss.Color("#fff")
		lightGray = lipgloss.Color("#dedede")
	)
	var (
		HeaderStyle  = re.NewStyle().Foreground(white).Bold(true).Align(lipgloss.Center)
		CellStyle    = re.NewStyle().Padding(0, 2)
		EvenRowStyle = CellStyle.Foreground(lightGray)
		BorderStyle  = lipgloss.NewStyle().Foreground(white)
	)

	t := table.New().
		Border(lipgloss.NormalBorder()).
		BorderStyle(BorderStyle).
		StyleFunc(func(row, col int) lipgloss.Style {
			switch {
			case row == 0:
				return HeaderStyle
			case row%2 == 0:
				return EvenRowStyle
			default:
				return CellStyle
			}
		}).
		Headers("time", "temp.", "rain", "wind")

	for _, item := range f {
		t.Row(
			item.Time.Format(time.DateTime),
			fmt.Sprintf("%.1f °C", item.Temperature),
			fmt.Sprintf("%.1f mm", item.Percipitation),
			fmt.Sprintf("%.1f m/s %s", item.Wind.Speed, item.Wind.DirectionToString()),
		)

	}

	fmt.Println(t)
}