#!/bin/bash

#*************************#
#      RELEASER:check     #
#*************************#
# Designed & Developed by #
#     Adrien Marquès      #
#     <xdrm-brackets>     #
#*************************#
#       git.xdrm.io       #
#*************************#

source ./format;



# (1) Check if requirements are installed
#--------------------------------------------------------#
echo -e "\e[33m>\e[0m (1) required programs \e[33m<\e[0m"

requirements="curl git docker docker-compose make"
set_inline_progress_size "20";

for r in $requirements; do

	inline_progress "   . $r";

	if which $r >/dev/null 2>&1; then
		echo "ok";
	else
		echo "missing";
		echo -e "\n\e[31m/!\\\\\e[0m  you must install \e[33m$r\e[0m.";
		echo -e "     this program is required to install the project";
		exit 1;
	fi;
done;



# (2) Check docker permissions
#--------------------------------------------------------#
echo;
echo -e "\e[33m>\e[0m (2) docker \e[33m<\e[0m";

# (1) docker permissions #
inline_progress "   . group";
if groups | grep 'docker' >/dev/null 2>&1; then
	echo "ok";
else
	echo "missing";
	echo;
	echo -e "     you might add the current user to the \e[33mdocker\e[0m group !";
	echo -e "\e[31m/!\\\\\e[0m  it is safer for administrative tasks. You might want";
	echo -e "     to avoid using 'root' for docker.";
	exit 1;
fi;



# (3) find out http installer
#--------------------------------------------------------#
echo;
echo -e "\e[33m>\e[0m (3) http installer \e[33m<\e[0m";
inline_progress "   * http server";
echo;

# 1. Check for installed candidates
existing="apache2 httpd nginx"
candidates="";
ncandidates="0"

i="0"
for current in $existing; do

	inline_progress "     . $current";
	if which $current >/dev/null 2>&1; then
		echo "ok";
		test -z "$candidates" && candidates="$current" || candidates="$candidates $current";
		ncandidates="`expr $ncandidates + 1`";
	else
		echo "..";
	fi;

	i="`expr $i + 1`";
done;


# 2. fail if no candidate
if [ "$ncandidates" -lt 1 ]; then
	echo;
	echo -e "     no http server has been found, you might install one.";
	echo -e "\e[31m/!\\\\\e[0m  the installer supports the most common ones: \e[33mnginx\e[0m"
	echo -e "     and \e[33mapache\e[0m (httpd)";
	exit 1;

# 3. only one candidate
elif [ "$ncandidates" -eq 1 ]; then
	echo;
	echo -e "     \e[33m$candidates\e[0m http server has been found. a reverse proxy will be"
	echo -e "\e[31m/!\\\\\e[0m  installed in order for the project to be remotely accessible.";
	echo -e "     do you want to use $candidates ? \e[33my\e[0m/\e[33mn\e[0m";
	read -p "     > " -n1 install; echo;

	case "$install" in
		Y|y) ;;
		*) echo -e "\n\e[31m/!\\\\\e[0m  aborting installation"; exit 1;;
	esac;

	http_installer="$candidates";

# 4. multiple candidates
else
	echo;
	echo -e "     multiple http server candidates have been found. a reverse proxy will be"
	echo -e "\e[31m/!\\\\\e[0m  installed in order for the project to be remotely accessible.";
	echo -e "     please choose the http server one you want to use:"
	echo -e "      (0) \e[33mabort\e[0m"
	i="1";
	for c in $candidates; do echo -e "      ($i) \e[33m$c\e[0m"; i="`expr $i + 1`"; done;
	read -p "     > " -n1 install; echo;

	# 4.1. Abort (or invalid)
	if [ "`expr $install + 0 2>/dev/null`" != "$install" -o "$install" = "0" ]; then
		echo -e "\n\e[31m/!\\\\\e[0m  aborting installation"; exit 1;
	elif [ "$install" -gt "$ncandidates" ]; then
		echo -e "\n\e[31m/!\\\\\e[0m  aborting installation"; exit 1;
	fi;

	http_installer=$(echo $candidates | awk "{print \$$install}")
fi;

echo "http_installer: $http_installer"



# (4) information disclaimer
#--------------------------------------------------------#
echo;
echo -e "\e[33m>\e[0m (4) information \e[33m<\e[0m";
echo;
echo -e "  \e[34m(!)\e[0m  (1) the project will run inside docker containers (3 containers).";
echo;
echo -e "  \e[34m(!)\e[0m  (2) the only links it has with the host machine (this machine) are:";
echo;
echo -e "  \e[34m(!)\e[0m      - \e[34mweb files\e[0m (that will be shared between multiple containers)";
echo -e "  \e[34m(!)\e[0m      - \e[34menvironment files\e[0m (for continuous integration)";
echo -e "  \e[34m(!)\e[0m      - \e[34ma listening socket\e[0m (to accept incoming http requests)";
echo;
echo -e "  \e[34m(!)\e[0m  (3) in order for incoming requests to go follow the path:";
echo -e "  \e[34m(!)\e[0m  	     [remote] => [http server] => [docker]";
echo;
echo -e "  \e[34m(!)\e[0m    we will install a reverse proxy on the http server ($http_installer) to";
echo -e "  \e[34m(!)\e[0m    automatically redirect requests from a specific \e[34m<HOST>\e[0m to docker's";
echo -e "  \e[34m(!)\e[0m    listening \e[34m<PORT>\e[0m.";
echo;
echo -e "  \e[34m(!)\e[0m    WARNING: The \e[34m<HOST>\e[0m must be available for your server and be a sub-domain";
echo -e "  \e[34m(!)\e[0m             in order for your DNS to be valid.";
echo;
echo -e "  \e[34m(!)\e[0m    EXAMPLE: If your server has \e[33mexample.net\e[0m as a DNS.";
echo -e "  \e[34m(!)\e[0m             the \e[34m<HOST>\e[0m \e[33mtest.example.net\e[0m is valid";
echo -e "  \e[34m(!)\e[0m             the \e[34m<HOST>\e[0m \e[33mtest.google.com\e[0m is not valid";



# (5) prompt server variables
#--------------------------------------------------------#
echo;
echo -e "\e[33m>\e[0m (5) variables \e[33m<\e[0m";

# 1. Port
minport="1024"
maxport="49151"
echo -e "   * what port do you want docker to use ? (between $minport and $maxport)";
echo -en "     \e[34m<PORT>\e[0m = ";
read port;

if [ -z "$port" -o "`expr $port + 0 2>/dev/null`" != "$port" ]; then
	echo;
	echo -e "\e[31m/!\\\\\e[0m  invalid port number. aborting installation"
	exit 1;
elif [ "$port" -lt $minport -o "$port" -gt $maxport ]; then
	echo;
	echo -e "\e[31m/!\\\\\e[0m  port out of range. aborting installation"
	exit 1;
fi;

# 2. Host
echo -e "   * what host do you want to redirect to docker ?";
echo -en "     \e[34m<HOST>\e[0m = ";
read host;

if [ -z "$host" ]; then
	echo;
	echo -e "\e[31m/!\\\\\e[0m  invalid host. aborting installation"
	exit 1;
fi;