#!/usr/bin/env bash
# 2025-11-10 Hyperling
# Volume management for systems without working volume buttons.
# Written for ease of use in terminal and simple window management systems.

function volume-usage {
	cat <<- EOF
		Usage: volume [%int] [(+/-)%int] [-d] [-r] [-t] [-h]

		Set to a static value:
		    volume 100, volume 65

		Increment or decrement. Passing only + or - and no number defaults to 5.
		    volume -5, volume 5-, volume - 5, volume 5 -
		    volume +20, volume 20+, volume + 20, volume 20 +

		Display the current volume:
		    volume,
		    volume-display, volume display, volume --display, volume -d,
		    volume +d

		Set volume to a random number between 0 and 100.
		    volume-random, volume random, volume --random, volume -r

		Be silly and oscillate volume in a loop:
		    volume-trip, volume trip, volume --trip, volume -t

		Display this help text:
		    volume-usage,
		    volume-help volume help, volume --help, volume -h
	EOF
	return "$1"
}
alias volume-help="volume-usage"
alias vol-h="volume-help"

function volume {
	if [[ "$1" == "--help" || "$1" == "help" || "$1" == "-h" ]]; then
		volume-usage
	fi
	if [[ (-z "$1" && -z "$2")
	|| "$1" == "--display" || "$1" == "display" || "$1" == "-d" || "$1" == "+d"
	]]; then
		volume-display
	fi

	if [[ "$1" == *"%"* || "$2" == *"%"* ]]; then
		set -- "${1//%/}" "${2//%/}"
	fi

	dir=""
	amt=""

	# Check if format is written text.
	if [[ "$1" == "full" || "$1" == "max" ]]; then
		amt=100
	fi
	if [[ "$1" == "mute" || "$1" == "none" ]]; then
		amt=0
	fi

	# Check if the format is "volume +/- %int"
	if [[ -z "$amt" && -z "$dir" ]]; then
		if [[ "$1" == "+" || "$1" == "-" ]]; then
			dir="$1"
			amt="$2"
			if [[ -z "$2" ]]; then
				amt="5"
			else
				amt="$2"
			fi
		fi
	fi

	# Check if the format is "volume +/- %int".
	if [[ -z "$amt" && -z "$dir" ]]; then
		if [[ "$2" == "+" || "$2" == "-" ]]; then
			amt="$1"
			dir="$2"
		fi
	fi

	# Check if amount and direction are adjacent, and if so, pull the values.
	if [[ -z "$amt" && -z "$dir" ]]; then
		if [[ "$1" == *"+"* ]]; then
			dir="+"
		elif [[ "$1" == *"-"* ]]; then
			dir="-"
		fi
		if [[ -n "$dir" && -z "$amt" ]]; then
			amt="$1"
			amt=${amt//-/}
			amt=${amt//+/}
		fi
	fi

	# Check if format is direct volume.
	if [[ -z "$dir" && -z "$amt" && -n "$1" && -z "$2" ]]; then
		amt="$1"
	fi

	if [[ -n "$dir" && -n "$amt" ]]; then
		echo "> Changing volume by '$dir$amt%'."
		amixer -q sset Master ${amt}%${dir}
		echo "> Volume is now '`volume-display`'."
		return 0
	fi

	if [[ -z "$dir" && -n "$1" ]]; then
		echo "> Setting volume to '$amt'."
		amixer -q sset Master ${amt}%
		echo "> Volume has been set to '`volume-display`'."
		return 0
	fi

	echo "Error: Should not have made it here. Please report this to the developer."
	echo "$0 $1 $2"
	return 7
}
alias vol="volume "
alias vol-="volume - "
alias vol+="volume + "

function volume-display {
	if [[ "$1" == "-v" || "$1" == "--verbose" || "$1" == "verbose" ]]; then
		amixer sget Master
	else
		amixer sget Master | egrep -o '[0-9]{1,3}%' | head -n 1
	fi
}
alias "vol-d"="volume-display"

# Go up and down until cancelled.
#function volume-trip {
#	curr eq amixer current readout
#	if curr lt 50 then dir eq + else dir eq -
#	while true; do
#		if vol is 0 then dir eq +
#		if vol is 100 then dir eq -
#		curr eq \$curr $dir 1
#		amixer set volume to curr
#		sleep 0.1
#	done
#}
#alias vol-t="volume-trip"
#alias volume-wub="volume-trip"
#alias vol-w="volume-wub"

#function volume-random {
#	v eq $RANDOM % 101
#	amixer set volume eq v
#}
#alias vol-r="volume-random"