#!/bin/bash

set -f

COUNT=10
MAX=8
MIN=4
NUM=4
CHARS=('!' '@' '#' '$' '%' '^' '&' '*' '(' ')' '{' '}' '[' ']' ':' ';' '/' '?' '>' '<' ',' '.' '=' '-' '_' '+' '~')
LIST='/usr/share/dict/words'




function gen_pass(){

	UPPER=0
	(
		echo $((RANDOM%99))
		echo $((RANDOM%99))
		i=$NUM
		while read word; do 
			if [ $UPPER -eq 0 ] && [ $((RANDOM % $i)) -eq 0  ]; then
				word="$(echo ${word^^})"
				UPPER=1
			fi
			echo -n  $word
			echo ${CHARS[$((RANDOM % ${#CHARS[@]}))]}
			i=$(( $i - 1 ))
		done <  <(sed -rn "/^[^']{$MIN,$MAX}$/p" "$LIST" |shuf|tail -${NUM}) 

	) |shuf|tr -d '\n'

}

function help() {
	cat << EOF
Usage: $0 [OPTIONS]
 -h, --help		Display this text
 -c, --count		Number of passwords to generate (10)
 -M, --max-length	Maximum length of words (8)
 -m, --min-length	Minimum length of words (4)
 -n, --number		Number of words per password (4)
 -l, --word-list	Specify a different word list to use (/usr/share/dict/words)
EOF
}

while [ $1 ]; do 
        # update the help text when adding new options
        case $1 in 
                -h|--help) help; exit;;
		-c|--count) COUNT=$2;shift 2;;
		-M|--max-length) MAX=$2;shift 2;;
		-m|--min-length) MIN=$2;shift 2;;
		-n|--number) NUM=$2;shift 2;;
		-l|--word-list) LIST=$2;shift 2;;
		*) break;;
	esac
done

for i in $(seq $COUNT); do 
	echo $(gen_pass)
done

set +f