package main

import (
	"fmt"
	"os"
	"strconv"
	"time"
)

var commandTimeDescription = "display more information about target timestamp/time"

func commandTime(args []string) {
	var err error
	targetTime := time.Now()
	if len(args) > 1 {
		targetTime, err = time.Parse(time.RFC3339, args[1])
		if err == nil {
			goto GOTTIME
		}
		if len(args[1]) <= 10 {
			var unix int
			unix, err = strconv.Atoi(args[1])
			if err != nil {
				fmt.Printf("`%v` is not a Unix Epoch Time\n", args[1])
				os.Exit(1)
			}
			targetTime = time.Unix(int64(unix), 0)
		} else if len(args[1]) >= 13 {
			var unixMilli int
			unixMilli, err = strconv.Atoi(args[1])
			if err != nil {
				fmt.Printf("`%v` is not a Unix Epoch Time in milliseconds\n", args[1])
				os.Exit(1)
			}
			targetTime = time.UnixMilli(int64(unixMilli))
		} else {
			fmt.Printf("`%v` is neighter a Unix Epoch Time, nor a formatted time in ISO8601", args[1])
			os.Exit(1)
		}

	}
GOTTIME:
	fmt.Printf("Unix:               %v\n", targetTime.Unix())
	fmt.Printf("Unix milliseconds:  %v\n", targetTime.UnixMilli())
	fmt.Printf("Local time:         %v\n", targetTime.Local().Format(time.RFC3339))
	fmt.Printf("UTC time:           %v\n", targetTime.UTC().Format(time.RFC3339))
	fmt.Printf("Time to target:     %v\n", targetTime.Sub(time.Now()))
}