package backend

import (
	"flag"
	"strconv"
	"strings"
)

var (
	VolumeCLIArg    int     = -1
	SeekToCLIArg    float64 = -1
	SeekByCLIArg    float64 = 0
	VolumePctCLIArg float64 = 0

	FlagPlay             = flag.Bool("play", false, "unpause or begin playback")
	FlagPause            = flag.Bool("pause", false, "pause playback")
	FlagPlayPause        = flag.Bool("play-pause", false, "toggle play/pause state")
	FlagPrevious         = flag.Bool("previous", false, "seek to previous track or beginning of current")
	FlagNext             = flag.Bool("next", false, "seek to next track")
	FlagStop             = flag.Bool("stop", false, "stop playback")
	FlagStopAfterCurrent = flag.Bool("stop-after-current", false, "stop playback after current track")
	FlagStartMinimized   = flag.Bool("start-minimized", false, "start app minimized")
	FlagShow             = flag.Bool("show", false, "show minimized app")
	FlagVersion          = flag.Bool("version", false, "print app version and exit")
	FlagHelp             = flag.Bool("help", false, "print command line options and exit")
)

func init() {
	flag.Func("volume", "sets the playback volume (0-100)", func(s string) error {
		v, err := strconv.Atoi(s)
		VolumeCLIArg = v
		return err
	})

	flag.Func("seek-to", "seeks to the given position in seconds in the current file (0.0 - <trackDur>)", func(s string) error {
		v, err := strconv.ParseFloat(s, 64)
		SeekToCLIArg = v
		return err
	})
	flag.Func("seek-by", "seeks back or forward by the given number of seconds (negative or positive)", func(s string) error {
		v, err := strconv.ParseFloat(s, 64)
		SeekByCLIArg = v
		return err
	})
	flag.Func("volume-adjust-pct", "adjusts volume up or down by the given percentage (positive or negative)", func(s string) error {
		if strings.HasSuffix(s, "%") {
			s = s[:len(s)-1]
		}
		v, err := strconv.ParseFloat(s, 64)
		VolumePctCLIArg = v
		return err
	})
}

func HaveCommandLineOptions() bool {
	visitedAny := false
	flag.Visit(func(f *flag.Flag) {
		// We skip `start-minimized` because it should't send an IPC message.
		if f.Name != "start-minimized" {
			visitedAny = true
		}
	})
	return visitedAny
}