#!/bin/bash

# Take one arg, and int, return 1 if variable is an INT or 0 if not
function	ft_is_int()
{
	# Check if value is numeric
	if [ "$1" -eq "$1" ] 2>/dev/null
	then
		return 0
	else
		echo -e "Value '`echo $1`' isn't numeric"
		return 1
	fi
}

# Default conf
default_port=21

usage="$(basename "$0") [-h] [-u username -i '127.0.0.1' -p '23' -s 'password'] -- send file from ftp protocol
where:
    -h  show this help text
    -u  username for ftp server
    -i  ipv4 address of remote ftp server
    -f  file to transfert to remote ftp server
    -w  password for ftp server
    -p  special ssh port"

# Check arguments
while getopts ":u:i:s:hf:p:" opt; do
	case $opt in
		h)
			echo "$usage"
			exit 0
			;;
		f)
			filename=$OPTARG
			if [ ! -f ${filename} ]
			then
				echo "Invalid filename given, abort"
				exit 1
			fi
			;;
		s)
			password=$OPTARG
			;;
		u)
			username=$OPTARG
			;;
		i)
			ipv4=$OPTARG
			;;
		p)
			port=$OPTARG
			if [ ${#port} -eq 0 ]
			then
				port=${default_port}
			elif ! ft_is_int $port
			then
				exit 1
			fi
			;;
    		\?)
    			echo "Invalid option: -$OPTARG" >&2
    			exit 1
    			;;
  		:)
    			echo "Option -$OPTARG requires an argument." >&2
    			exit 1
    			;;
	esac
done

# Check if passwrd wat provide
if [ ${#password} -eq 0 ]
then
	echo "No password enter, usage: -p password"
	exit 1
fi

# Check if User wat provide
if [ ${#username} -eq 0 ]
then
	echo "No user enter, usage: -u username"
	exit 1
fi

# Check if a filename have been provided
if [ ${#filename} -eq 0 ]
then
	echo "No filename given, usage: -f <filename>"
	exit 1
fi

# Check if IPv4 was provide
if [ ${#ipv4} -eq 0 ]
then
	echo "No IPv4 enter, usage: -i 42.42.42.42"
	exit 1
fi

# Check if port is reachable
reach=$(nc -zv ${ipv4} ${port} | grep 'Connection refused')
if [ ${#reach} -ne 0 ]
then
	echo "Can't reach host ${ipv4}, abort"
	exit 1
fi

ftp -n -v ${ipv4} ${port} <<SCRIPT
ascii
user ${username} ${password}
put ${filename}
quit
SCRIPT

echo "Your file is now on ftp server.
Bye."