#!/usr/bin/env bash
#
# Collection of reusable functions and variables
# 

TODAY=`date`
HOSTNAME=`hostname`

function debug
{
	if [ "${DEBUG}" = '1' ]; then
		echo -e "DEBUG: $1"
	fi
}

function err
{
	echo -e "FATAL ERROR: $1"
	exit 1
}

function send_notification
{
	opt=""
    if [ -n "$FROM" ]; then
		local mailcmd=$(readlink -f `which mail`)
		if [ "${mailcmd}" = "/usr/bin/bsd-mailx" ]; then
			opt="-a 'From: ${FROM}'"
		else		
			opt="-r $FROM"
		fi
	fi

	echo "Sending notification."
	echo -e "$2" | mail $opt -s "$1" ${EMAIL}
}

function check_values
{
	
	a_name=$1[@]
	a_array=("${!a_name}")
	if [ -z ${!a_name+x} ]; then
		return
	fi
	
	if [ ${a_array[$2]} == true ]; then
		if [ "x${4}" = 'x' ]; then
        	echo $3
			exit 1
		fi
	fi
        
}

function run_cmd {
	debug "Executing: '$1 $2'"
	if [ ! -e $LOG ]; then
		touch $LOG
	fi

	## Check if command exists on system
	if ! command -v $1; then
		err "$1: command not found"
	fi

	## Check if debug is set and send command output to shell
	## Some commands send animated text that can corrupt the log
	if test -n "${DEBUG}"; then
		debug "DEBUG variable set, redirecting command output to console" 
		$1 $2
		if [ $? -gt 0 ]; then
            err "Failed running command '$1 $2'"
		fi
	else
		$1 $2 2>> $LOG
		# FIXME: This logic might need re-work?
		if [ $? -gt 0 ]; then
            echo "ERROR: Failed running command '$1 $2'."
            echo "Displaying last 20 lines of ${LOG}..."
            echo
            tail $LOG
            echo
            exit 1
        fi
	fi

	
}