package main

import(
    "flag"
    "fmt"
    "time"
    "os"
)

var sec = 0

func main() {

    // arguments
    t := flag.Int( "t", 1, "interval" )
    s := flag.Bool( "s", false, "normal sleep" )
    q := flag.Bool( "q", false, "quiet ( not print count and time )" )
    c := flag.Int( "c", 0, "loop count ( without [s] )" )
    m := flag.Bool( "m", false, "print every minute ( without [q] )" )
    b := flag.Bool( "b", false, "beep" )

    flag.Parse()

    if *t > 0 {

        if !*q {
            s := fmt.Sprintf( "[%04d] %s ...", *c, time.Now().Format( "15:04:05" ) )
            fmt.Println( s )
        }

        if *s {
            for i := 0; i < *t; i++ {
                sleep1ms( *q, *m, *b, i + 1 )
            }
            os.Exit( 0 )
        }

        if *c < 0 {
            fmt.Fprintln( os.Stderr, "bad loop count." )
            os.Exit( 1 )
        }
        if *c > 0 {
            for i := 0; i < *c; i++ {
                sleep1ms( *q, *m, *b, *c - i - 1 )
            }
        } else {
            n := 1
            for {
                sleep1ms( *q, *m, *b, n )
                n++
            }
        }

    } else {
        fmt.Fprintln( os.Stderr, "bad time." )
        os.Exit( 1 )
    }
}

func sleep1ms( quiet, minute, beep bool, n int ) {

    s := time.Duration( 1.00 * 1000 ) * time.Millisecond
    time.Sleep( s )
    sec++

    if minute && sec % 60 == 0 {
        str := fmt.Sprintf( "[%04d] %s", n / 60, time.Now().Format( "15:04:05" ) )
        fmt.Println( str )
    }
    if !quiet && !minute {
        str := fmt.Sprintf( "[%04d] %s", n, time.Now().Format( "15:04:05" ) )
        fmt.Println( str )
    }

    if beep {
        //os.Stdout.Write( []byte( "\u0007" ) )
        fmt.Print( "\a" )
    }
}