#!/bin/bash

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

if [ ! -e _common.sh ]; then
	# Fetch helpers file if not in current directory
	cp ../settings/scripts/_common.sh ./_common.sh
	chmod a+rx _common.sh
fi
source /usr/share/yunohost/helpers
source _common.sh

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

# Exit if an error occurs during the execution of the script
ynh_abort_if_errors

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

app=$YNH_APP_INSTANCE_NAME

domain=$(ynh_app_setting_get $app domain)
path_url=$(ynh_app_setting_get $app path_url)
final_path=$(ynh_app_setting_get $app final_path)
is_public=$(ynh_app_setting_get $app is_public)
admin=$(ynh_app_setting_get $app admin)
db_name=$(ynh_app_setting_get $app db_name)
db_pwd=$(ynh_app_setting_get $app db_pwd)

#=================================================
# BACKUP BEFORE UPGRADE
#=================================================

# Stop services
systemctl stop $app-sidekiq
systemctl stop $app-puma

# Backup the current version of the app
if [[ $(ynh_app_setting_get $app disable_backup_before_upgrade) != '1' ]]
then
    ynh_backup_before_upgrade
    ynh_clean_setup () {
        ynh_restore_upgradebackup
    }
fi
#=================================================
# INSTALL DEPENDENCIES
#=================================================

ynh_install_app_dependencies "$pkg_dependencies"

#=================================================
# INSTALL RUBY
#=================================================

ynh_install_ruby $RUBY_VERSION

#=================================================
# NGINX CONFIGURATION
#=================================================

# Reference: https://meta.discourse.org/t/subfolder-support-with-docker/30507?u=falco&source_topic_id=54191
if [ "$path_url" != "/" ] ; then
  ynh_replace_string '$proxy_add_x_forwarded_for' '$http_your_original_ip_header' ../conf/nginx.conf
fi

# Create a dedicated nginx config
ynh_add_nginx_config

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

ynh_app_setting_set $app final_path $final_path
# Download, check integrity, uncompress and patch the source from app.src
ynh_setup_source "$final_path"
# Install LDAP plugin
mkdir -p "$final_path/plugins/discourse-ldap-auth"
ynh_setup_source "$final_path/plugins/discourse-ldap-auth" ldap-auth

#=================================================
# SPECIFIC SETUP
#=================================================

#=================================================
# CONFIGURE DISCOURSE
#=================================================

# Make a backup of the original config file if modified
ynh_backup_if_checksum_is_different "$final_path/config/discourse.conf"
# Configure database
discourse_config_file="$final_path/config/discourse.conf"
cp $final_path/config/discourse_defaults.conf $discourse_config_file
ynh_replace_string "db_name = discourse" "db_name = $db_name" "$discourse_config_file"
ynh_replace_string "db_username = discourse" "db_username = $db_name" "$discourse_config_file"
ynh_replace_string "db_password =" "db_password = $db_pwd" "$discourse_config_file"

# Configure hostname
ynh_replace_string "hostname = \"www.example.com\"" "hostname = \"$domain\"" "$discourse_config_file"
ynh_replace_string "relative_url_root =" "relative_url_root = ${path_url%/}" "$discourse_config_file"
# Serve static assets (i.e. images, js, etc.)
ynh_replace_string "serve_static_assets = false" "serve_static_assets = true" "$discourse_config_file"
# Don't show miniprofiler
ynh_replace_string "load_mini_profiler = true" "load_mini_profiler = false" "$discourse_config_file"


# Configure e-mail server
admin_mail=$(ynh_user_get_info "$admin" mail)
ynh_replace_string "developer_emails =" "developer_emails = $admin_mail" "$discourse_config_file"
ynh_replace_string "smtp_address =" "smtp_address = localhost" "$discourse_config_file"
ynh_replace_string "smtp_domain =" "smtp_domain = $domain" "$discourse_config_file"
ynh_replace_string "smtp_enable_start_tls = true" "smtp_enable_start_tls = false" "$discourse_config_file"

# Calculate and store the config file checksum
ynh_store_file_checksum "$discourse_config_file"

# Make a backup of the original config file if modified
ynh_backup_if_checksum_is_different "$final_path/plugins/discourse-ldap-auth/config/settings.yml"
# Configure LDAP plugin
ldap_config_file="$final_path/plugins/discourse-ldap-auth/config/settings.yml"
ynh_replace_string "adfs.example.com" "localhost" "$ldap_config_file"
ynh_replace_string "dc=example,dc=com" "ou=users,dc=yunohost,dc=org" "$ldap_config_file"
ynh_replace_string "sAMAccountName" "uid" "$ldap_config_file"
ynh_store_file_checksum "$ldap_config_file"

#=================================================
# SETUP PUMA, A RUBY SERVER
#=================================================
puma_config_file="$final_path/config/puma.rb"
# Set log files location
ynh_replace_string "#{APP_ROOT}/log/puma" "/var/log/$app/puma" "$puma_config_file"
# Set application absolute path
ynh_replace_string "/home/discourse/discourse" "/var/www/$app" "$puma_config_file"
# Don't daemonize so we get logs in journalctl
ynh_replace_string "daemonize true" "daemonize false" "$puma_config_file"
# Don't preload threads to avoid warnings
ynh_replace_string "preload_app" "#preload_app" "$puma_config_file"
# Calculate and store the config file checksum
ynh_store_file_checksum "$puma_config_file"

# Set a secret value
cp ../conf/secrets.yml "$final_path/config/secrets.yml"
ynh_replace_string "__SECRET__" "$(ynh_string_random)" "$final_path/config/secrets.yml"
# Calculate and store the config file checksum
ynh_store_file_checksum "$final_path/config/secrets.yml"

# Set permissions to app files
chown -R $app: $final_path


# Install puma with gem
(cd "$final_path"
# Install bundler, a gems installer
gem install bundler
# Install without documentation
exec_as $app echo "gem: --no-ri --no-rdoc" >> "$final_path/.gemrc"
# Install dependencies
exec_login_as $app bundle install --path vendor/bundle --with development)
# On ARM architecture, replace bundled libpsl by system native libpsl
# because the provided binary isn't compatible
if [ -n "$(uname -m | grep arm)" ] ; then
  (cd $final_path/vendor/bundle/ruby/*/gems/mini_suffix-*/vendor
  rm libpsl.so
  ln -s $(ldconfig -p | grep libpsl | awk 'END {print $NF}') libpsl.so)
fi

#=================================================
# SETUP SIDEKIQ
#=================================================
cp ../conf/sidekiq.yml "$final_path/config/sidekiq.yml"

#=================================================
# PREPARE THE DATABASE
#=================================================

rake_exec="exec_login_as $app RAILS_ENV=production bin/rake"
$rake_exec db:migrate
$rake_exec assets:precompile

#=================================================
# GENERIC FINALIZATION
#=================================================
# SECURE FILES AND DIRECTORIES
#=================================================

# Set permissions to app files
chown -R $app: $final_path

#=================================================
# SETUP SSOWAT
#=================================================

# If app is public, add url to SSOWat conf as skipped_uris
if [ $is_public -eq 1 ]; then
  # unprotected_uris allows SSO credentials to be passed anyway.
  ynh_app_setting_set "$app" skipped_uris "/"
fi

#=================================================
# RELOAD NGINX
#=================================================

systemctl reload nginx

#=================================================
# START PUMA AND SIDEKIQ
#=================================================

# Wait for discourse-puma to be fully started
# As discourse-sidekiq is a dependency, it is automatically started before
ynh_check_starting_systemd "Use Ctrl-C to stop" "$app-puma" "120"