#!/bin/bash

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

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

#=================================================
# MANAGE SCRIPT FAILURE
#=================================================

ynh_clean_setup () {
	ynh_clean_check_starting
}
# Exit if an error occurs during the execution of the script
ynh_abort_if_errors

#=================================================
# RETRIEVE ARGUMENTS FROM THE MANIFEST
#=================================================

wifi_ssid=$YNH_APP_ARG_WIFI_SSID
wifi_passphrase=$YNH_APP_ARG_WIFI_PASSPHRASE
firmware_nonfree=$YNH_APP_ARG_FIRMWARE_NONFREE

app=$YNH_APP_INSTANCE_NAME

# the service name must match the service template files
service_name=ynh-$app

#=================================================
# CHECK IF THE APP CAN BE INSTALLED WITH THESE ARGS
#=================================================
ynh_script_progression --message="Validating installation parameters..."

# Check arguments
if [[ -z $wifi_ssid ]] || [[ -z $wifi_passphrase ]]; then
	ynh_die --message="Your Wifi Hotspot needs a name and a password"
fi

# Check passphrase length
wifi_passphrase_length="$(wc -c <<< "${wifi_passphrase}")"
if [[ $wifi_passphrase_length -lt 8 ]] || [[ $wifi_passphrase_length -gt 63 ]]; then
	ynh_die --message="Your password must from 8 to 63 characters (WPA2 passphrase)"
fi

# Check no special characters are present in the passphrase
if [[ $wifi_passphrase =~ [^[:print:]] ]]; then
	ynh_die --message="Only printable ASCII characters are permitted in your password (WPA2 passphrase)"
fi

#=================================================
# STORE SETTINGS FROM MANIFEST
#=================================================
ynh_script_progression --message="Storing installation settings..."

ynh_app_setting_set --app=$app --key=wifi_ssid --value="$wifi_ssid"
ynh_app_setting_set --app=$app --key=wifi_passphrase --value="$wifi_passphrase"
ynh_app_setting_set --app=$app --key=firmware_nonfree --value="$firmware_nonfree"
ynh_app_setting_set --app=$app --key=service_name --value=$service_name

#=================================================
# STANDARD MODIFICATIONS
#=================================================
# FIND AND OPEN A PORT
#=================================================
ynh_script_progression --message="Configuring firewall..."

# Update firewall for DHCP
ynh_exec_warn_less yunohost firewall allow --no-upnp --ipv6 UDP 547
ynh_exec_warn_less yunohost firewall allow --no-upnp UDP 67

# Meh idk where to put this ... On RPi, by default wlan is blocked
if test -e /usr/sbin/rfkill && rfkill | grep wlan | grep -q -w 'blocked'
then
    ynh_print_info "Unblocking wlan interface..."
    /usr/sbin/rfkill unblock wlan
fi

#=================================================
# INSTALL NONFREE FIRWARE IF REQUESTED
#=================================================
ynh_script_progression --message="Installing firmware..."

export DEBIAN_FRONTEND=noninteractive

# Packaged USB Wireless Device firmwares
# Based on https://wiki.debian.org/WiFi#USB_Devices
if [[ $firmware_nonfree -eq 1 ]]; then
	check_armbian_nonfree_conflict
	ynh_install_extra_app_dependencies --repo="deb http://deb.debian.org/debian $(ynh_get_debian_release) non-free" --package="$nonfree_firmware_packages"
else
	pkg_dependencies="$pkg_dependencies $free_firmware_packages"
fi

#=================================================
# INSTALL DEPENDENCIES
#=================================================
ynh_script_progression --message="Installing dependencies..."

ynh_install_app_dependencies $pkg_dependencies

#=================================================
# CREATE DEDICATED USER
#=================================================
ynh_script_progression --message="Configuring system user..."

# Create a system user
ynh_system_user_create --username=$app

#=================================================
# SPECIFIC SETTINGS
#=================================================
ynh_script_progression --message="Configuring hotspot..."

ip4_nat_prefix_index=${app##*__}
if [[ "${ip4_nat_prefix_index}" == "${app}" ]]; then
  	ip4_nat_prefix_index=0
fi
ip4_nat_prefix="10.${ip4_nat_prefix_index}.242"
ip4_dns="${ip4_nat_prefix}.1"

hot_reload_usb_wifi_cards
wifi_device=$(unused_iw_devices | head -n 1)
wifi_secure=1
wifi_channel=6

ynh_app_setting_set --app=$app --key=wifi_ssid --value="${wifi_ssid}"
ynh_app_setting_set --app=$app --key=wifi_secure --value="${wifi_secure}"
ynh_app_setting_set --app=$app --key=wifi_passphrase --value="${wifi_passphrase}"
ynh_app_setting_set --app=$app --key=wifi_device --value="${wifi_device}"
ynh_app_setting_set --app=$app --key=wifi_channel --value="${wifi_channel}"
ynh_app_setting_set --app=$app --key=advanced --value=0
ynh_app_setting_set --app=$app --key=ip6_firewall --value=1
ynh_app_setting_set --app=$app --key=ip4_dns --value="${ip4_dns}"
ynh_app_setting_set --app=$app --key=ip4_nat_prefix --value="${ip4_nat_prefix}"

if [[ -z $wifi_device ]]; then
	ynh_app_setting_set --app=$app --key=service_enabled --value=0
else
	ynh_app_setting_set --app=$app --key=service_enabled --value=1
fi

#=================================================
# COPY CONFIGS
#=================================================
ynh_script_progression --message="Copying configuration files..."

mkdir -pm 0755 /etc/hostapd/$app/
chown root: /etc/hostapd/$app/

mkdir -pm 0755 /etc/dnsmasq.$app/
chown root: /etc/dnsmasq.$app/

install -b -o root -g root -m 0644 ../conf/hostapd.conf.tpl /etc/hostapd/$app/hostapd.conf.tpl
install -b -o root -g root -m 0644 ../conf/dnsmasq_dhcpdv6.conf.tpl /etc/dnsmasq.$app/dhcpdv6.conf.tpl
install -b -o root -g root -m 0644 ../conf/dnsmasq_dhcpdv4.conf.tpl /etc/dnsmasq.$app/dhcpdv4.conf.tpl

# Copy init script
ynh_add_config --template="../conf/ynh-hotspot" --destination="/usr/local/bin/$service_name"
chmod 0755 "/usr/local/bin/$service_name"

# Copy openvpn scripts
mkdir -pm 0755 /etc/openvpn/scripts
mkdir -pm 0755 /etc/openvpn/scripts/route-up.d
mkdir -pm 0755 /etc/openvpn/scripts/route-down.d
ynh_add_config --template="../conf/openvpn_90-hotspot" --destination="/etc/openvpn/scripts/route-up.d/90-$service_name"
ynh_add_config --template="../conf/openvpn_90-hotspot" --destination="/etc/openvpn/scripts/route-down.d/90-$service_name"
chmod 0755 "/etc/openvpn/scripts/route-up.d/90-${service_name}"
chmod 0755 "/etc/openvpn/scripts/route-down.d/90-${service_name}"

# Copy openvpn scripts
mkdir -pm 0755 /etc/openvpn/scripts
mkdir -pm 0755 /etc/openvpn/scripts/route-up.d
mkdir -pm 0755 /etc/openvpn/scripts/route-down.d
install -o root -g root -m 0755 ../conf/openvpn_90-hotspot /etc/openvpn/scripts/route-up.d/90-hotspot
install -o root -g root -m 0755 ../conf/openvpn_90-hotspot /etc/openvpn/scripts/route-down.d/90-hotspot


#=================================================
# CONFIGURE HOSTAPD
#=================================================
ynh_script_progression --message="Configuring hostapd..."

# Set default inits
# The boot order of these services are important, so they are disabled by default
# and the ynh-hotspot service handles them.
systemctl disable hostapd --quiet 2>&1
systemctl stop hostapd 2>&1
systemctl unmask hostapd 2>&1 # On some system e.g. RPi, for some reason hostapd is masked after install ...

if [[ -n "${wifi_device}" ]]; then 
	configure_hostapd
	configure_dhcp
fi

#=================================================
# SETUP SYSTEMD
#=================================================
ynh_script_progression --message="Configuring a systemd service..."

# Create a dedicated systemd config
ynh_add_systemd_config --service=$service_name
# Create custom systemd config for hostapd to handle multiple wifi devices
ynh_add_systemd_config --service="hostapd@$app" --template="../conf/systemd_hostapd.service"

#=================================================
# INTEGRATE SERVICE IN YUNOHOST
#=================================================
ynh_script_progression --message="Integrating service in YunoHost..."

yunohost service add $service_name --description "Creates a Wi-Fi access point" --test_status "systemctl is-active hostapd@$app"

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

# Start a systemd service if device is present
if [[ $wifi_device == "" ]]; then
	echo "WARNING: Wifi Hotspot is not started because no wifi device was found (please, check the web admin)" >&2
else
	ynh_systemd_action --service_name=$service_name --action="start" --log_path=systemd #--line_match="Started YunoHost Wifi Hotspot"
fi

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

ynh_script_progression --message="Installation of $app completed"