#!/bin/bash
#
# Common variables and helpers
#

pkg_dependencies="php7.0-fpm sipcalc dnsutils openvpn curl fake-hwclock"

to_logs() {

  # When yunohost --verbose or bash -x
  if $_ISVERBOSE; then
    cat
  else
    cat > /dev/null
  fi
}

# Experimental helpers
# Cf. https://github.com/YunoHost-Apps/Experimental_helpers/blob/72b0bc77c68d4a4a2bf4e95663dbc05e4a762a0a/ynh_read_manifest/ynh_read_manifest
read_json () {
    python3 -c "import sys, json;print(json.load(open('$1'))['$2'])"
}

# Experimental helper
# Cf. https://github.com/YunoHost-Apps/Experimental_helpers/blob/72b0bc77c68d4a4a2bf4e95663dbc05e4a762a0a/ynh_read_manifest/ynh_read_manifest
read_manifest () {
    if [ -f '../manifest.json' ] ; then
        read_json '../manifest.json' "$1"
    else
        read_json '../settings/manifest.json' "$1"
    fi
}

# Experimental helper
# cf. https://github.com/YunoHost-Apps/Experimental_helpers/blob/master/ynh_abort_if_up_to_date/ynh_abort_if_up_to_date
ynh_abort_if_up_to_date () {
    version=$(read_json "/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json" 'version' 2> /dev/null || echo '20160501-7')
    last_version=$(read_manifest 'version')
    if [ "${version}" = "${last_version}" ]; then
        ynh_print_info "Up-to-date, nothing to do"
        ynh_die "" 0
    fi
}

# Read the value of a key in a ynh manifest file
#
# usage: ynh_read_manifest manifest key
# | arg: manifest - Path of the manifest to read
# | arg: key - Name of the key to find
ynh_read_manifest () {
    manifest="$1"
    key="$2"
    python3 -c "import sys, json;print(json.load(open('$manifest', encoding='utf-8'))['$key'])"
}

# Read the upstream version from the manifest
# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
# For example : 4.3-2~ynh3
# This include the number before ~ynh
# In the last example it return 4.3-2
#
# usage: ynh_app_upstream_version
ynh_app_upstream_version () {
    manifest_path="../manifest.json"
    if [ ! -e "$manifest_path" ]; then
        manifest_path="../settings/manifest.json"   # Into the restore script, the manifest is not at the same place
    fi
    version_key=$(ynh_read_manifest "$manifest_path" "version")
    echo "${version_key/~ynh*/}"
}

# Read package version from the manifest
# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
# For example : 4.3-2~ynh3
# This include the number after ~ynh
# In the last example it return 3
#
# usage: ynh_app_package_version
ynh_app_package_version () {
    manifest_path="../manifest.json"
    if [ ! -e "$manifest_path" ]; then
        manifest_path="../settings/manifest.json"   # Into the restore script, the manifest is not at the same place
    fi
    version_key=$(ynh_read_manifest "$manifest_path" "version")
    echo "${version_key/*~ynh/}"
}

# Exit without error if the package is up to date
#
# This helper should be used to avoid an upgrade of a package
# when it's not needed.
#
# To force an upgrade, even if the package is up to date,
# you have to set the variable YNH_FORCE_UPGRADE before.
# example: YNH_FORCE_UPGRADE=1 yunohost app upgrade MyApp
#
# usage: ynh_abort_if_up_to_date
ynh_abort_if_up_to_date () {
    local force_upgrade=${YNH_FORCE_UPGRADE:-0}
    local package_check=${PACKAGE_CHECK_EXEC:-0}

    local version=$(ynh_read_manifest "/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json" "version" || echo 1.0)
    local last_version=$(ynh_read_manifest "../manifest.json" "version" || echo 1.0)
    if [ "$version" = "$last_version" ]
    then
        if [ "$force_upgrade" != "0" ]
        then
            echo "Upgrade forced by YNH_FORCE_UPGRADE." >&2
            unset YNH_FORCE_UPGRADE
        elif [ "$package_check" != "0" ]
        then
            echo "Upgrade forced for package check." >&2
        else
            ynh_die "Up-to-date, nothing to do" 0
        fi
    fi
}

# Operations needed by both 'install' and 'upgrade' scripts
function vpnclient_deploy_files_and_services()
{
  local domain=$1
  local app=$2
  local service_name=$3
  local sysuser="${app}"
  local service_checker_name="$service_name-checker"

  # Ensure vpnclient_ynh has its own system user
  if ! ynh_system_user_exists ${sysuser}
  then
    ynh_system_user_create ${sysuser}
  fi

  # Ensure the system user has enough permissions
  install -b -o root -g root -m 0440 ../conf/sudoers.conf /etc/sudoers.d/${app}_ynh
  ynh_replace_string "__VPNCLIENT_SYSUSER__" "${sysuser}" /etc/sudoers.d/${app}_ynh

  # Install IPv6 scripts
  install -o root -g root -m 0755 ../conf/ipv6_expanded /usr/local/bin/
  install -o root -g root -m 0755 ../conf/ipv6_compressed /usr/local/bin/

  # Install command-line cube file loader
  install -o root -g root -m 0755 ../conf/$service_name-loadcubefile.sh /usr/local/bin/

  # Copy confs
  mkdir -pm 0755 /var/log/nginx/
  chown root:${sysuser} /etc/openvpn/
  chmod 775 /etc/openvpn/
  mkdir -pm 0755 /etc/yunohost/hooks.d/post_iptable_rules/

  install -b -o root -g ${sysuser} -m 0664 ../conf/openvpn_client.conf.tpl /etc/openvpn/client.conf.tpl
  install -o root -g root -m 0644 ../conf/openvpn_client.conf.tpl /etc/openvpn/client.conf.tpl.restore
  install -b -o root -g root -m 0755 ../conf/hook_post-iptable-rules /etc/yunohost/hooks.d/90-vpnclient.tpl
  install -b -o root -g root -m 0644 ../conf/openvpn@.service /etc/systemd/system/

  # Copy web sources
  mkdir -pm 0755 /var/www/${app}/
  cp -a ../sources/* /var/www/${app}/

  chown -R root: /var/www/${app}/
  chmod -R 0644 /var/www/${app}/*
  find /var/www/${app}/ -type d -exec chmod +x {} \;

  # Create certificates directory
  mkdir -pm 0770 /etc/openvpn/keys/
  chown root:${sysuser} /etc/openvpn/keys/

  #=================================================
  # NGINX CONFIGURATION
  #=================================================
  ynh_print_info "Configuring nginx web server..."

  ynh_add_nginx_config

  #=================================================
  # PHP-FPM CONFIGURATION
  #=================================================
  ynh_print_info "Configuring php-fpm..."

  ynh_add_fpm_config

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

  # Fix sources
  ynh_replace_string "__PATH__" "${path_url}" "/var/www/${app}/config.php"

  # Copy init script
  install -o root -g root -m 0755 ../conf/$service_name /usr/local/bin/

  # Copy checker timer
  install -o root -g root -m 0755 ../conf/$service_checker_name.sh /usr/local/bin/
  install -o root -g root -m 0644 ../conf/$service_checker_name.timer /etc/systemd/system/

  #=================================================
  # SETUP SYSTEMD
  #=================================================
  ynh_print_info "Configuring a systemd service..."

  ynh_add_systemd_config $service_name "$service_name.service"

  ynh_add_systemd_config $service_checker_name "$service_checker_name.service"
}

function service_is_managed_by_yunohost() {
  yunohost service status $1 >/dev/null 2>&1
}