#!/bin/bash
# 2022-09-14 Hyperling
# Ensure dependencies are met and start the webserver.

## Setup ##

DIR="$(dirname -- "${BASH_SOURCE[0]}")"
PROG="$(basename -- "${BASH_SOURCE[0]}")"

# Ensure we are executing from this file's directory.
cd $DIR
DIR="`pwd`"
NAME="'$DIR/$PROG'"
echo $NAME

## Functions ##

function usage {
	cat <<- EOF
		$PROG calls the main Node.js program after ensuring the project can run.
		  (PORTS)
		    -p : Pass the port numbers that the API/website should listen at.
		         Example: $PROG -p 80 -p 443 -p 8080
		  (HELP)
		    -h : Show this usage output and exit successfully.
	EOF
	exit $1
}

function log {
	message="$1"
	echo -e "`date` - $message"
}

log "Local process information:"
ps $$
function check_main {
	if [[ -z "$1" ]]; then
		echo "ERROR: Subprocess name was not provided. $1"
		exit 0
	fi
	log "Subprocess '$1' checking if main process is still running..."
	ps $$ >/dev/null
	status=$?
	if [[ $status != 0 ]]; then
		log "Process '$$' not found, '$1' from '$DIR/$PROG' exiting."
		exit 0
	fi
}

## Parameters ##

while getopts ':p:h' opt; do
	case "$opt" in
		p) (( OPTARG < 1024 )) && [[ $LOGNAME != "root" ]] && {
				echo "WARNING: Port $OPTARG is privileged. Will need to be root."
				exit 1
			}
			ports="$ports $OPTARG" ;;
		h) usage 0 ;;
		*) echo "ERROR: Option $OPTARG not recognized." >&2
			usage 1 ;;
	esac
done

if [[ -z $ports ]]; then
	ports=8080
fi

## Build Environment ##

sudo=""
if [[ -z $LOGNAME ]]; then
	LOGNAME="`whoami`"
fi
if [[ $LOGNAME != "root" ]]; then
	log "Using sudo since user is '$LOGNAME'."
	sudo="sudo"
fi

log "Check if any system dependencies need installed."
progs=""
if [[ ! `which php` ]]; then
	echo "- Installing PHP"
	progs="$progs php-cli"
fi
if [[ ! `which node` ]]; then
	echo "- Installing Node"
	progs="$progs nodejs"
fi
if [[ ! `which npm` ]]; then
	echo "- Installing NPM"
	progs="$progs npm"
fi
if [[ ! `which curl` ]]; then
	echo "- Installing Curl"
	progs="$progs curl"
fi
if [[ ! `which ps` ]]; then
	echo "- Installing PS"
	progs="$progs procps"
fi
if [[ -n "$progs" ]]; then
	$sudo apt-get install -y $progs
fi

# Directories and allowed page types are executable, others are not.
log "Fix any strange file permissions."
find ./pages/ | while read file; do
	if [[ $file == *".php" || $file == *".sh" || -d $file ]]; then
		mode=755
	else
		mode=644
	fi
	chmod -c $mode $file
done

log "Check if any node modules need updated/installed."
npm install

# Reset generated index files.
log "Removing old index files."
find files/photos/ -name "*".html -print -delete
{
	check_main photos
	$DIR/check_photos.sh "$ports"
} &

## Main ##

log "Start check_git."
while true; do
	check_main check_git
	$DIR/check_git.sh
	sleep 30
done &

log "Start website API."
node ./main.js $ports
status=$?

## Finish ##

log "Kill spawned processes."
pkill -eP $$

log "Exiting with status '$status'."
exit $status