#!/bin/bash

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

S="20"

inline_progress(){

	# 1. init arguments
	text=""
	size="$S"
	sep=" "

	# 2. extract text
	test ! -z "$1" && text="$1";

	# 3. extract size
	test ! -z "$2" && test "`expr $2 + 0 2>/dev/null`" = "$2" && size="$2";

	# 4. Write text
	len="`echo -n \"$text\" | wc -m`";
	echo -n "$text";
	for i in `seq $len $size`; do echo -n "$sep"; done;

	return;
}



# (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"

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[34m(!)\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[34m(!)\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;

# 5. 'httpd' is service name, but config dir is apache2
http_root="/etc/$http_installer";
test "$http_installer" = "httpd" && http_root="/etc/apache2";

# 6. configuration root dir
inline_progress "   . config root";

if [ -d "$http_root" ]; then
	echo "ok";
else
	echo "missing";
	echo -e "\n\e[31m/!\\\\\e[0m  cannot find configuration folder \e[33m$http_root\e[0m. aborting installation";
	exit 1;
fi;

# 7. configuration structure
inline_progress "   . config tree";

if [ -d "$http_root/sites-available" -a -d "$http_root/sites-enabled" ]; then
	echo "ok";
else
	echo "invalid";
	echo -e "\n     invalid configuration structure. You might have \e[33m$http_root/sites-available\e[0m containing";
	echo -e "\e[31m/!\\\\\e[0m  your configurations and \e[33m$http_root/sites-enabled\e[0m containing symbolic links";
	echo -e "     only for activated configurations. aborting installation";
	exit 1;
fi;


# (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 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) redirection 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 -e "     ( values other than \e[33m8080\e[0m may be unstable )";
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;

# 3. Unlock permissions
echo -n "   * sudo access   ";
if sudo echo "granted"; then
	echo -n "";
else
	echo;
	echo -e "\e[31m/!\\\\\e[0m  permission issue. you must launch the installer with a sudoer. aborting installation"
	exit 1;
fi;





# (6) pre-install: reverse-proxy
#--------------------------------------------------------#
echo;
echo -e "\e[33m>\e[0m (6) reverse proxy \e[33m<\e[0m";

# (1) LOCAL DNS #
inline_progress "   . local dns";

# 1.1. remove previously generated + append new line
cat /etc/hosts | grep -vP "# generated by: ptut installer" > /tmp/installer_hosts;
echo -e "127.0.0.1\t$host\t# generated by: ptut installer" | sudo tee -a /tmp/installer_hosts >/dev/null;

sudo cp /etc/hosts /etc/hosts.backup;
sudo mv /tmp/installer_hosts /etc/hosts;
c2="$?";

# 1.2. manage errors
if [ "$c2" = "0" ]; then
	echo "ok";
else
	echo;
	echo -e "\e[31m/!\\\\\e[0m  cannot write to /etc/hosts. skipping this step."
fi;


inline_progress "   * $http_installer"; echo;

# 1. Copy configuration
echo -n "     - create proxy configuration  ";
if [ "$http_installer" = "apache2" -o "$http_installer" = "httpd" ]; then
	echo """<VirtualHost *:80>
	ServerName $host
	ServerAlias www.$host

	ProxyPreserveHost On
	ProxyRequests off
	ProxyPass / http://127.0.0.1:$port/
	ProxyPassReverse / http://127.0.0.1:$port/
</VirtualHost>""" | sudo tee $http_root/sites-available/$host.reverse-proxy > /dev/null;

elif [ "$http_installer" = "nginx" ]; then
	echo """server {
	listen 80;
	server_name $host www.$host;

	location / {
		proxy_set_header Host \$host;
		proxy_pass http://127.0.0.1:$port;
	}
}""" | sudo tee $http_root/sites-available/$host.reverse-proxy > /dev/null;
else
	echo "error";
	echo -e "\n\e[31m/!\\\\\e[0m  no installer matches '$http_installer'. aborting installation";
	exit 1;
fi;

# manage error
if [ "$?" = "0" ]; then
	echo "ok";
else
	echo "error";
	echo -e "\n\e[31m/!\\\\\e[0m  cannot write to $http_root/sites-availables/. aborting installation";
	exit 1;
fi;

echo -n "     - enable proxy                ";
sudo ln -fs ../sites-available/$host.reverse-proxy $http_root/sites-enabled/$host.reverse-proxy;
echo "ok";

echo -n "     - reload server               ";
sudo systemctl is-active $http_installer || sudo systemctl start $http_installer;
sudo systemctl reload $http_installer;
echo "ok";



# (7) clone sources
#--------------------------------------------------------#
echo;
echo -e "\e[33m>\e[0m (7) fetching \e[33m<\e[0m";

# 1. Clone
inline_progress "   . cloning";
git clone --recursive https://git.xdrm.io/ptut/virtenv.git $host;
if [ "$?" = "0" ]; then
	echo "ok";
else
	echo "error";
	echo -e "\n\e[31m/!\\\\\e[0m  cannot clone sources to ./$host. aborting installation";
	exit 1;
fi;

# 2. Fetch database
inline_progress "   . fetch data";
mkdir -p ./$host/metactl/persistent \
&& curl https://xdrm.io/script/ptut-database > ./$host/metactl/persistent/mariadb.sql;

if [ "$?" = "0" ]; then
	echo "ok";
else
	echo "error";
	echo -e "\n\e[31m/!\\\\\e[0m  cannot fetch data. aborting installation";
	exit 1;
fi;

# 3. Set custom port
inline_progress "   . port $port";
cat ./$host/docker-compose.yml | sed "s/8080:80/$port:80/" > /tmp/docker-compose-new-port;
mv /tmp/docker-compose-new-port ./$host/docker-compose.yml;
echo "ok";

# (8) make installer
#--------------------------------------------------------#
echo;
echo -e "\e[33m>\e[0m (8) installer \e[33m<\e[0m";
make -C ./$host start;