#!/bin/sh

LOW_USED_COLOR="#a3be8c"
MEDIUM_USED_COLOR="#ebcb8b"
HIGH_USED_COLOR="#bf616a"
DEFAULT_USED_COLOR="#81a1c1"
UNUSED_COLOR="#5e81ac"

usage=$1
width=$2
usage_color=$3

command -v "$1" >/dev/null && usage=$($1)

low_used=$((width * 30 / 100))
medium_used=$((width * 60 / 100))
num_used_chars=$(printf 'scale=0; (%s * %s) / 100\n' "$usage" "$width" | bc -l)

if [ -n "$usage_color" ]; then
	case "$num_used_chars" in
	[0-$low_used]) used_color="$LOW_USED_COLOR" ;;
	[$low_used-$medium_used]) used_color="$MEDIUM_USED_COLOR" ;;
	*) used_color="$HIGH_USED_COLOR" ;;
	esac
else
	used_color="$DEFAULT_USED_COLOR"
fi

prev_opened=0
any_used_width=0
i=1
while [ "$i" -le "$width" ]; do
	if [ "$i" -le "$num_used_chars" ]; then
		if [ "$prev_opened" -eq 0 ]; then
			bar="$bar<fc=$used_color>"
			prev_opened=1
			any_used_width=1
		fi
		bar="$bar#"
	else
		if [ "$any_used_width" -eq 1 ]; then
			bar="$bar</fc>"
			prev_opened=0
			any_used_width=0
		fi
		if [ "$prev_opened" -eq 0 ]; then
			bar="$bar<fc=$UNUSED_COLOR>"
			prev_opened=1
		fi
		bar="$bar:"
	fi
	i=$((i + 1))
done
bar="$bar</fc>"

printf '%s\n' "$bar"