#!/bin/bash

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

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

#=================================================
# 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

#=================================================
# LOAD SETTINGS
#=================================================

multisite=$(ynh_app_setting_get $app multisite)

if [ $multisite -eq 1 ]
then
	echo "A multisite installation of Wordpress can't be moved easily. Please have a look at the Wordpress codex to learn more about that." >&2
	ynh_die "https://codex.wordpress.org/Moving_WordPress#Moving_WordPress_Multisite"
fi

#=================================================
# 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 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
#=================================================

# 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 "\(^.*rewrite.*\^$old_path.* permanent;\)" "#sub_path_only\1" "$nginx_conf_path"
		ynh_replace_string "\(rewrite *\^\)$old_path\$ $old_path/*" "\1$new_path$ $new_path" "$nginx_conf_path"

	# Move to a sub path
	else
		ynh_replace_string "^#sub_path_only" "" "$nginx_conf_path"
		ynh_replace_string "\(rewrite *\^\)$old_path\$ $old_path/*" "\1$new_path$ $new_path/" "$nginx_conf_path"
	fi

	ynh_replace_string "location ${old_path%/}/" "location ${new_path%/}/" "$nginx_conf_path"

	# Change the rewrite instructions for multisite
	ynh_replace_string "rewrite \^$old_path\(.*last;\)" "rewrite ^$new_path\1" "$nginx_conf_path"
	ynh_replace_string "$old_path\$2 last;" "$new_path\$2 last;" "$nginx_conf_path"

	# Change the rewrite instruction with $request_filename
	ynh_replace_string "${old_path%/}/index.php?q=" "${new_path%/}/index.php?q=" "$nginx_conf_path"

	# 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

#=================================================
# SPECIFIC MODIFICATIONS
#=================================================
# UPDATE THE DATABASE
#=================================================

ynh_mysql_execute_as_root "UPDATE wp_options SET option_value='$new_domain$new_path' WHERE option_name='siteurl'" $app
ynh_mysql_execute_as_root "UPDATE wp_options SET option_value='$new_domain$new_path' WHERE option_name='home'" $app

#=================================================
# GENERIC FINALISATION
#=================================================
# RELOAD NGINX
#=================================================

systemctl reload nginx