package cmd

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

	"git.sr.ht/~timharek/yr/cmd/flags"
	"git.sr.ht/~timharek/yr/cmd/internal/ui/table"
	"git.sr.ht/~timharek/yr/internal/nominatim"
	"git.sr.ht/~timharek/yr/yr"
	"github.com/pkg/browser"
	"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)
	isUTC, err := cmd.Flags().GetBool(flags.UTC)
	cobra.CheckErr(err)
	isWeb, err := cmd.Flags().GetBool(flags.WEB)
	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)
	}
	f := &yr.ForecastResult{}
	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 isWeb {
		url := fmt.Sprintf("https://www.yr.no/en/forecast/daily-table/%.4f,%.4f", f.Coordinates.Latitude, f.Coordinates.Longitude)
		err := browser.OpenURL(url)
		if err != nil {
			cobra.CheckErr(err)
		}
		os.Exit(0)
	}

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

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

	t := table.New()

	for _, item := range f.Forecast {
		itemTime := item.Time.Local()
		if isUTC {
			itemTime = item.Time
		}
		t.Row(
			itemTime.Format("Mon, 2 Jan 15:04"),
			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)
}