#!/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 $app db_pwd)
redis_db=$(ynh_app_setting_get $app redis_db)

# Check memory requirements
check_memory_requirements_upgrade

#=================================================
# ENABLE MAINTENANCE MODE
#=================================================

ynh_maintenance_mode_ON

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

# Stop services
systemctl stop $app

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

# Create a dedicated nginx config
ynh_add_nginx_config

# 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' '$http_your_original_ip_header' "/etc/nginx/conf.d/$domain.d/$app.conf"
fi
ynh_store_file_checksum "/etc/nginx/conf.d/$domain.d/$app.conf"

if ! ynh_is_upstream_up_to_date ; then

	#=================================================
	# 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"

	# Configure redis
	ynh_replace_string "redis_db = 0" "redis_db = $redis_db" "$discourse_config_file"

	# Don't notify on new versions (handled by the YunoHost package)
	ynh_replace_string "new_version_emails = true" "new_version_emails = 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 UNICORN, A RUBY SERVER
	#=================================================
	unicorn_config_file="$final_path/config/unicorn.conf.rb"
	# Use socket connection
	ynh_replace_string 'listen (ENV\["UNICORN_PORT"\] || 3000).to_i' '# listen (ENV["UNICORN_PORT"] || 3000).to_i' "$unicorn_config_file"
	ynh_replace_string '# listen "#{discourse_path}/tmp/sockets/unicorn.sock"' 'listen "#{discourse_path}/tmp/sockets/unicorn.sock"' "$unicorn_config_file"
	# Calculate and store the config file checksum
	ynh_store_file_checksum "$unicorn_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"
	# Specific actions on ARM architecture
	if [ -n "$(uname -m | grep arm)" ] ; then
	  # Unapply commit cf9b4a789b855b5199e98a13424e409854a8e848 that breaks ARM
	  # compatibility by pointing to a recent libv8 version
	  # This is due to this libv8 issue (https://github.com/cowboyd/libv8/issues/261)
	  # that prevents it from being compiled on ARM hence no binary gem is available yet
	  (cd $final_path
	  wget https://github.com/discourse/discourse/commit/cf9b4a789b855b5199e98a13424e409854a8e848.diff -O libv8-patch.diff
	  patch -R -p1 < libv8-patch.diff
	  rm libv8-patch.diff)
	fi
	# 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

	#=================================================
	# 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
	# Restrict rights to log directory (needed by logrotate)
	chmod g-w $final_path/log
fi
#=================================================
# 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 UNICORN
#=================================================

if [ -n "$(uname -m | grep arm)" ] ; then
	unicorn_workers=2
else
	unicorn_workers=3
fi
# Wait for discourse to be fully started
ynh_check_starting "INFO -- : worker=$((unicorn_workers-1)) ready" "$final_path/log/unicorn.stderr.log" "240" "$app"

#=================================================
# DISABLE MAINTENANCE MODE
#=================================================

ynh_maintenance_mode_OFF