#!/usr/bin/env bash

# Exit on command errors and treat unset variables as an error
set -eu

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

install_dependencies() {
  sudo apt-get install --yes python-msgpack python-gevent
}

nginx_config_file() {
  local app=$1
  local domain=$2

  sudo mkdir --parents "/etc/nginx/conf.d/${domain}.d"
  
  echo "/etc/nginx/conf.d/${domain}.d/${app}.conf"
}

update_nginx_configuration() {
  local app=$1
  local config_template=$2 
  local config_file=$3
  local path=$4
  local port=$5

  sudo cp $config_template $config_file

  sudo sed --in-place "s@YNH_WWW_PATH@${path}@g" ${config_file}
  sudo sed --in-place "s@YNH_LOCAL_PORT@${port}/@g" ${config_file}

  sudo service nginx reload
}

systemd_service_name() {
  local app=$1
  local user=$2

  echo "ynh-${app}-${user}.service"
}

#
# Creates service which runs zeronet on unique port for the user
# ZeroNet data is stored in the users home directory in ~/.zeronet
#
update_systemd_configuration() {
  local app=$1
  local service_template=$2
  local service_name=$3
  local service_file=$4
  local user=$5
  local group_id=$6
  local port=$7
  local symlink_to_deploy_path=$8
  local zeronet_dir=$9

  # create zeronet user data location
  local data_dir=$zeronet_dir/data
  local log_dir=$zeronet_dir/log

  sudo mkdir -p $data_dir 
  sudo mkdir -p $log_dir
  sudo chown -R $user:$group_id $zeronet_dir

  # configure systemd service
  sudo cp $service_template $service_file

  sudo sed --in-place "s@USER@$user@g" $service_file
  sudo sed --in-place "s@UI_PORT@$port@g" $service_file
  sudo sed --in-place "s@APP_NAME@$app@g" $service_file
  sudo sed --in-place "s@WORKING_DIRECTORY@$symlink_to_deploy_path@g" $service_file
  sudo sed --in-place "s@DATA_DIR@$data_dir@g" $service_file
  sudo sed --in-place "s@LOG_DIR@$log_dir@g" $service_file

  sudo systemctl daemon-reload
  sudo systemctl enable $service_name
  sudo systemctl start $service_name
}

# Source: https://github.com/YunoHost/yunohost/blob/901e3df9b604f542f2c460aad05bcc8efc9fd054/data/helpers.d/network
#
# Find a free port and return it
#
# example: port=$(ynh_find_port 8080)
#
# usage: ynh_find_port begin_port
# | arg: begin_port - port to start to search
ynh_find_port () {
  port=$1
  
  while netcat -z 127.0.0.1 $port # Check if the port is free
  do
    port=$((port+1)) # Else, pass to next port
  done
  echo $port
}

main() {
  local app=$YNH_APP_INSTANCE_NAME
  local number=$YNH_APP_INSTANCE_NUMBER
  local domain=$YNH_APP_ARG_DOMAIN
  local user=$YNH_APP_ARG_ADMIN

  local group_id=`id -g $user`
  local port=$( ynh_find_port 43110 ) # the port zeronet listens on

  local path="/"
  local is_public=0 # by defaut access to zeronet is private
  local nginx_config_template=../conf/nginx.conf.template
  local systemd_service_template=../conf/systemd.service.template
  local app_config=../conf/app.src
  local systemd_service_dir=/etc/systemd/system

  local url=$domain$path
  local source_version=$( app_config_get $app_config "SOURCE_VERSION" )
  local systemd_service_name=$( systemd_service_name $app $user )
  local systemd_service_file="${systemd_service_dir}/${systemd_service_name}"
  local nginx_config_file=$( nginx_config_file $app $domain )
  local user_zeronet_dir="/home/${user}/.zeronet"
  local deploy_path=$( make_deploy_path $app $source_version )
  local symlink_to_deploy_path="/var/www/${app}"

  sudo yunohost app checkurl $url -a $app 

  ynh_user_exists $user

  ynh_app_setting_set $app is_public $is_public
  ynh_app_setting_set $app domain $domain
  ynh_app_setting_set $app path $path
  ynh_app_setting_set $app url $url
  ynh_app_setting_set $app admin $user
  ynh_app_setting_set $app group_id $group_id
  ynh_app_setting_set $app deploy_path $deploy_path
  ynh_app_setting_set $app symlink_to_deploy_path $symlink_to_deploy_path
  ynh_app_setting_set $app port $port
  ynh_app_setting_set $app installed_version $source_version
  ynh_app_setting_set $app nginx_config_file $nginx_config_file
  ynh_app_setting_set $app user_zeronet_dir $user_zeronet_dir
  ynh_app_setting_set $app systemd_service_name $systemd_service_name
  ynh_app_setting_set $app systemd_service_file $systemd_service_file

  install_dependencies
  obtain_and_deploy_source $app_config $deploy_path $symlink_to_deploy_path
  #mock_obtain_and_deploy_source $deploy_path $symlink_to_deploy_path

  update_nginx_configuration $app $nginx_config_template $nginx_config_file $path $port
  update_systemd_configuration $app $systemd_service_template $systemd_service_name $systemd_service_file \
    $user $group_id $port $symlink_to_deploy_path $user_zeronet_dir
}

main