#!/bin/bash

#=================================================
# GENERIC STARTING
#=================================================
# IMPORT GENERIC HELPERS
#=================================================

source _common.sh
source /usr/share/yunohost/helpers

#=================================================
# RETRIEVE ARGUMENTS
#=================================================

old_domain=$YNH_APP_OLD_DOMAIN
old_path=$YNH_APP_OLD_PATH

new_domain=$YNH_APP_NEW_DOMAIN
new_path=$YNH_APP_NEW_PATH

app=$YNH_APP_INSTANCE_NAME

mypads=$(ynh_app_setting_get $app mypads)

#=================================================
# CHECK THE SYNTAX OF THE PATHS
#=================================================

test -n "$old_path" || old_path="/"
test -n "$new_path" || new_path="/"
new_path=$(ynh_normalize_url_path $new_path)
old_path=$(ynh_normalize_url_path $old_path)

#=================================================
# CHECK IF THE PATH CAN BE CHANGED
#=================================================

if [ "$new_path" != "/" ] && [ $mypads -eq 1 ]
then
	ynh_die "Mypads needs to be installed on the root of a domain or a subdomain."
fi

#=================================================
# CHECK WHICH PARTS SHOULD BE CHANGED
#=================================================

change_domain=0
if [ "$old_domain" != "$new_domain" ]
then
	change_domain=1
fi

change_path=0
if [ "$old_path" != "$new_path" ]
then
	change_path=1
fi

#=================================================
# MANAGE FAILURE OF THE SCRIPT
#=================================================

ynh_clean_setup () {
# Nettoyage des résidus d'installation non pris en charge par le script remove.
	if test -n "$PID_TAIL"
	then
		SUPPRESS_WARNING kill -s 15 $PID_TAIL	# Arrête l'exécution de tail.
		ynh_secure_remove "$tempfile"
	fi
}
# Exit if an error occurs during the execution of the script
ynh_abort_if_errors

#=================================================
# STANDARD MODIFICATIONS
#=================================================
# MODIFY URL IN NGINX CONF
#=================================================

nginx_conf_path=/etc/nginx/conf.d/$old_domain.d/$app.conf

# Change the path in the nginx config file
if [ $change_path -eq 1 ]
then
	# Make a backup of the original nginx config file if modified
	ynh_backup_if_checksum_is_different "$nginx_conf_path"

	# Move from sub path to root
	if [ "$new_path" == "/" ]
	then
		ynh_replace_string "^location $old_path/" "location $new_path" "$nginx_conf_path"
		ynh_replace_string "^.*rewrite.*\^/" "#sub_path_only&" "$nginx_conf_path"
		ynh_replace_string "^location ~\* $old_path/" "location ~* $new_path" "$nginx_conf_path"

		# Change the path in the two rewrite instructions
		ynh_replace_string "\(rewrite *\^\)$old_path\$ $old_path/*" "\1$new_path$ $new_path" "$nginx_conf_path"
		ynh_replace_string "\(rewrite *\^\)$old_path/*admin\$ $old_path/*" "\1${new_path}admin\$ $new_path" "$nginx_conf_path"

	# Move to a sub path
	else
		ynh_replace_string "^location $old_path.*" "location $new_path/ {" "$nginx_conf_path"
		ynh_replace_string "^#sub_path_only" "" "$nginx_conf_path"
		ynh_replace_string "^location ~\* $old_path/*" "location ~* $new_path/" "$nginx_conf_path"

		# Change the path in the two rewrite instructions
		ynh_replace_string "\(rewrite *\^\)$old_path\$ $old_path/*" "\1$new_path$ $new_path/" "$nginx_conf_path"
		ynh_replace_string "\(rewrite *\^\)$old_path/*admin\$ $old_path/*" "\1$new_path/admin\$ $new_path/" "$nginx_conf_path"
	fi

	# Calculate and store the nginx config file checksum
	ynh_store_file_checksum "$nginx_conf_path"
fi

# Change the domain for nginx
if [ $change_domain -eq 1 ]
then
	# Delete file checksum for the old conf file location
	ynh_delete_file_checksum "$nginx_conf_path"
	mv $nginx_conf_path /etc/nginx/conf.d/$new_domain.d/$app.conf

	nginx_conf_path=/etc/nginx/conf.d/$new_domain.d/$app.conf
	# Calculate and store the nginx config file checksum
	ynh_store_file_checksum "$nginx_conf_path"
fi

#=================================================
# RELOAD NGINX
#=================================================

systemctl reload nginx

#=================================================
# START ETHERPAD IN BACKGROUND
#=================================================

# Démarre etherpad
WARNING echo "Redémarrage d'etherpad"
tempfile="$(mktemp)"
tail -f -n1 /var/log/$app/etherpad.log > "$tempfile" &	# Suit le démarrage dans le log
PID_TAIL=$!	# Récupère le PID de la commande tail, qui est passée en arrière plan.
systemctl start $app	# Redémarre etherpad. Le démarrage est fait le plus tôt possible, car il est très long...

#=================================================
# CHECK ETHERPAD STARTING
#=================================================

for i in `seq 1 120`
do	# La boucle attend le démarrage d'etherpad. Ou 2 minutes. Cette boucle évite simplement un 502 au début, car le démarrage est long...
	if grep -q "You can access your Etherpad instance at" "$tempfile"; then
		WARNING echo "Le service $app a démarré correctement."
		break	# Si le log annonce le démarrage d'etherpad, sort de la boucle.
	fi
	WARNING echo -n "."
	sleep 1
done
echo ""
QUIET kill -s 15 $PID_TAIL	# Arrête l'exécution de tail.
ynh_secure_remove "$tempfile"