#!/bin/bash

#=================================================
# GENERIC START
#=================================================
# IMPORT GENERIC HELPERS
#=================================================

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

#=================================================
# LOAD SETTINGS
#=================================================
ynh_print_info --message="Loading installation settings..."

app=$YNH_APP_INSTANCE_NAME

domain=$(ynh_app_setting_get --app=$app --key=domain)
path_url=$(ynh_app_setting_get --app=$app --key=path)
is_public=$(ynh_app_setting_get --app=$app --key=is_public)
port=$(ynh_app_setting_get --app=$app --key=port)
final_path=$(ynh_app_setting_get --app=$app --key=final_path)
secret=$(ynh_app_setting_get --app=$app --key=secret)
db_name=$(ynh_app_setting_get --app=$app --key=db_name)
db_user=$db_name
db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd)
theme=$(ynh_app_setting_get --app=$app theme)
hashed_password=$(ynh_app_setting_get --app=$app --key=hashed_password)

#=================================================
# CHECK VERSION
#=================================================
ynh_print_info --message="Checking version..."

upgrade_type=$(ynh_check_app_version_changed)

#=================================================
# ENSURE DOWNWARD COMPATIBILITY
#=================================================
ynh_print_info --message="Ensuring downward compatibility..."

# Fix is_public as a boolean value
if [ "$is_public" = "Yes" ]; then
	ynh_app_setting_set --app=$app --key=is_public --value=1
	is_public=1
elif [ "$is_public" = "No" ]; then
	ynh_app_setting_set --app=$app --key=is_public --value=0
	is_public=0
fi

# If final_path doesn't exist, create it
if [ -z "$final_path" ]; then
	final_path=/var/www/$app
	ynh_app_setting_set --app=$app --key=final_path --value=$final_path
fi

if [ -z "$db_pwd" ]; then
	db_pwd=$(ynh_app_setting_get --app=$app --key=db_pwd)	# Fix old db_pwd
	if [ -z "$db_pwd" ]; then
		db_name=$(ynh_sanitize_dbid --db_name="$app")
		db_user=$db_name
		# Initialize database and store postgres password for upgrade
		ynh_psql_setup_db --db_user="$db_user" --db_name="$db_name"
		ynh_app_setting_set --app="$app" --key=db_name --value="$db_name"
		db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd) # Password created in ynh_psql_setup_db function
	else
		ynh_app_setting_delete --app=$app --key=db_pwd
		ynh_app_setting_set --app=$app --key=psqlpwd --value=$db_pwd
	fi
fi

if [ -z "$theme" ]; then
	theme="milligram"
	ynh_app_setting_set --app=$app --key=theme --value=$theme
fi

if [ -z "$hashed_password" ]; then
	# Generate random password
	password=$(ynh_string_random --length=8)
	hashed_password=$(echo -n $password | sha256sum | cut -d' ' -f1)

	echo "The new version of LSTU provide an admin and a stats area which required a password." > mail_to_send
	echo "" >> mail_to_send
	echo "This password is: $password" >> mail_to_send

	ynh_send_readme_to_admin --app_message="mail_to_send" --type="upgrade"
	
	ynh_app_setting_set --app=$app --key=hashed_password --value=$hashed_password
fi

#=================================================
# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
#=================================================
ynh_print_info --message="Backing up the app before upgrading (may take a while)..."

# Backup the current version of the app
ynh_backup_before_upgrade
ynh_clean_setup () {
	ynh_clean_check_starting
	# restore it if the upgrade fails
	ynh_restore_upgradebackup
}
# Exit if an error occurs during the execution of the script
ynh_abort_if_errors

#=================================================
# STANDARD UPGRADE STEPS
#=================================================
# STOP SYSTEMD SERVICE
#=================================================
ynh_print_info --message="Stopping a systemd service..."

ynh_systemd_action --service_name=$app --action="stop" --log_path="systemd"

#=================================================
# DOWNLOAD, CHECK AND UNPACK SOURCE
#=================================================

if [ "$upgrade_type" == "UPGRADE_APP" ]
then
	ynh_print_info --message="Upgrading source files..."

	# Download, check integrity, uncompress and patch the source from app.src
	ynh_setup_source --dest_dir="$final_path"
fi

#=================================================
# NGINX CONFIGURATION
#=================================================
ynh_print_info --message="Upgrading nginx web server configuration..."

# Create a dedicated nginx config
ynh_add_nginx_config

#=================================================
# UPGRADE DEPENDENCIES
#=================================================
ynh_print_info --message="Upgrading dependencies..."

ynh_install_app_dependencies $pkg_dependencies

#=================================================
# CREATE DEDICATED USER
#=================================================
ynh_print_info --message="Making sure dedicated system user exists..."

# Create a dedicated user (if not existing)
ynh_system_user_create --username=$app

#=================================================
# SPECIFIC UPGRADE
#=================================================
# UPGRADE LSTU CONFIGURATION
#=================================================
ynh_print_info --message="Upgrading lstu configuration..."

config="${final_path}/lstu.conf"
ynh_backup_if_checksum_is_different --file="$config"
cp ../conf/lstu.conf.template "$config"
ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="$config"
ynh_replace_string --match_string="__PATH__" --replace_string="$path_url" --target_file="$configf"
ynh_replace_string --match_string="__PORT__" --replace_string="$port" --target_file="$config"
ynh_replace_string --match_string="__DB_NAME__" --replace_string="$db_name"  --target_file="$config"
ynh_replace_string --match_string="__DB_USER__" --replace_string="$db_user"  --target_file="$config"
ynh_replace_string --match_string="__DB_PWD__" --replace_string="$db_pwd" --target_file="$config"
ynh_replace_string --match_string="__SELECTED_THEME__" --replace_string="$theme" --target_file="$config"
ynh_replace_string --match_string="__PASSWORD_HASHED__" --replace_string="$hashed_password" --target_file="$config"
ynh_replace_string --match_string="__SECRET__" --replace_string="$secret" --target_file="$config"
if [ $is_public -eq 0 ];
then
	ynh_replace_string --match_string="__IS_PUBLIC__" --replace_string="" --target_file="$config"
else
	ynh_replace_string --match_string="__IS_PUBLIC__" --replace_string="#" --target_file="$config"
fi
ynh_store_file_checksum --file="$config"

#=================================================
# BUILD LSU
#=================================================
ynh_print_info --message="Building lstu..."

pushd $final_path
	carton install --deployment --without=sqlite --without=mysql
popd

#=================================================
# SETUP LOGROTATE
#=================================================
ynh_print_info --message="Upgrading logrotate configuration..."

# Use logrotate to manage app-specific logfile(s)
ynh_use_logrotate --non-append

#=================================================
# SETUP SYSTEMD
#=================================================
ynh_print_info --message="Upgrading systemd configuration..."

# Create a dedicated systemd config
ynh_add_systemd_config

#=================================================
# GENERIC FINALIZATION
#=================================================
# SECURING FILES AND DIRECTORIES
#=================================================
ynh_print_info --message="Securing files and directories..."

# Set permissions on app files
chown -R www-data $final_path

#=================================================
# SETUP SSOWAT
#=================================================
ynh_print_info --message="Upgrading SSOwat configuration..."

ynh_app_setting_set --app=$app --key=unprotected_uris --value="/"
if [ $is_public -eq 0 ]
then
	# If the app is private, only the shortened URLs are publics.
	if [ "$path_url" == "/" ]; then
	    # If the path is /, clear it to prevent any error with the regex.
	    path_url=""
	fi
	# Modify the domain to be used in a regex
	domain_regex=$(echo "$domain" | sed 's@-@.@g')
	ynh_app_setting_set --app=$app --key=protected_regex --value="$domain_regex$path_url/login$","$domain_regex$path_url/logout$","$domain_regex$path_url/api$","$domain_regex$path_url/extensions$","$domain_regex$path_url/stats$","$domain_regex$path_url/d/.*$","$domain_regex$path_url/a$","$domain_regex$path_url/$"
fi

#=================================================
# START SYSTEMD SERVICE
#=================================================
ynh_print_info --message="Starting a systemd service..."

ynh_systemd_action --service_name=$app --action=reload --line_match="Reloaded Shortened URLs service." --log_path="systemd"

#=================================================
# RELOAD NGINX
#=================================================
ynh_print_info --message="Reloading nginx web server..."

ynh_systemd_action --service_name=nginx --action=reload

#=================================================
# END OF SCRIPT
#=================================================

ynh_print_info --message="Upgrade of $app completed"