#!/bin/bash

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

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

if [ "${PACKAGE_CHECK_EXEC:-0}" -ne 1 ]; then
    # Check memory requirements
    check_memory_requirements
fi

#=================================================
# INITIALIZE AND STORE SETTINGS
#=================================================

relative_url_root=${path%/}

# Create a random password
admin_pwd=$(ynh_string_random)
admin_mail=$(ynh_user_get_info --username=$admin --key=mail)

redis_db=$(ynh_redis_get_free_db)
ynh_app_setting_set --app="$app" --key=redis_db --value="$redis_db"

# Set a secret value
secret="$(ynh_string_random)"

# We assume for the moment that ARM devices are only dual core, so
# we restrict the number of workers to 2 (the default is 3)
if dpkg --print-architecture | grep -q "arm"; then
    unicorn_workers=2
else
    unicorn_workers=3
fi
ynh_app_setting_set --app="$app" --key=unicorn_workers --value=$unicorn_workers

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

ynh_exec_warn_less ynh_install_ruby --ruby_version="$ruby_version"
ynh_use_ruby

ynh_script_progression --message="Installing NodeJS..."

ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version

ynh_script_progression --message="Building and installing ImageMagick v7..."
install_imagemagick

#=================================================
# CONFIGURE A POSTGRESQL DATABASE
#=================================================
ynh_script_progression --message="Configuring $app's PostgreSQL database..."

# Set extensions
ynh_psql_execute_as_root --database="$db_name" --sql="CREATE EXTENSION IF NOT EXISTS hstore;"
ynh_psql_execute_as_root --database="$db_name" --sql="CREATE EXTENSION IF NOT EXISTS pg_trgm;"

#=================================================
# DOWNLOAD, CHECK AND UNPACK SOURCE
#=================================================
ynh_script_progression --message="Setting up source files..."

# Specific actions on ARM architecture
if dpkg --print-architecture | grep -q "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
    cp ../sources/patches_arm/* ../sources/patches
fi

# Download, check integrity, uncompress and patch the source from app.src
ynh_setup_source --dest_dir="$install_dir/discourse"

# Install LDAP plugin
# See https://github.com/jonmbake/discourse-ldap-auth/issues/77
ynh_setup_source --source_id=ldap-auth --dest_dir="$install_dir/discourse/plugins/ldap"

# Add a pids and socket directory for the systemd script.
mkdir -p "$install_dir/discourse/tmp/pids"
mkdir -p "$install_dir/discourse/tmp/sockets"
mkdir -p "$install_dir/discourse/public/forum"

# Create specific folders and links for subfolder compatibility
# (see: https://meta.discourse.org/t/subfolder-support-with-docker/30507)
ln -s "$install_dir/discourse/public/uploads" "$install_dir/discourse/public/forum/uploads"
ln -s "$install_dir/discourse/public/backups" "$install_dir/discourse/public/forum/backups"

chmod -R o-rwx "$install_dir"
chown -R "$app:www-data" "$install_dir"

#=================================================
# ADD A CONFIGURATION
#=================================================
ynh_script_progression --message="Adding $app's configuration file..."

ynh_add_config --template="discourse_defaults.conf" --destination="$install_dir/discourse/config/discourse.conf"
ynh_add_config --template="secrets.yml" --destination="$install_dir/discourse/config/secrets.yml"
ynh_add_config --template="settings.yml" --destination="$install_dir/discourse/plugins/ldap/config/settings.yml"

# Disable svgo worker
echo "svgo: false" | ynh_exec_as "$app" tee "$install_dir/discourse/.image_optim.yml" >/dev/null

#=================================================
# SETUP UNICORN, A RUBY SERVER
#=================================================
ynh_script_progression --message="Setting up Unicorn..."

# On ARM architecture, replace bundled libpsl by system native libpsl
# because the provided binary isn't compatible
if dpkg --print-architecture | grep -q "arm"; then
    (
        cd "$install_dir/discourse/vendor/bundle/ruby"/*/"gems/mini_suffix-*/vendor"
        rm libpsl.so
        ln -s "$(ldconfig -p | grep libpsl | awk 'END {print $NF}')" libpsl.so
    )
fi

pushd "$install_dir/discourse"
    # Install bundler, a gems installer
    ynh_gem install bundler
    # Install without documentation
    echo "gem: --no-ri --no-rdoc" | ynh_exec_as "$app" tee "$install_dir/.gemrc" >/dev/null

    # Specific actions on ARM architecture
    if dpkg --print-architecture | grep -q "arm"; then
        # Define the platform specifically to retrieve binaries
        # for libv8 because it currently doesn't compile on ARM devices
        _exec_as_app_with_ruby_node "$install_dir/discourse/bin/bundle" config specific_platform arm-linux
    fi

    # Install dependencies
    _exec_as_app_with_ruby_node "$install_dir/discourse/bin/bundle" config set path 'vendor/bundle'
    _exec_as_app_with_ruby_node "$install_dir/discourse/bin/bundle" config set without test development
    _exec_as_app_with_ruby_node MAKEFLAGS=-j2 "$install_dir/discourse/bin/bundle" install --jobs 2
popd

pushd "$install_dir/discourse"
    ynh_use_nodejs
    ynh_npm install --location=global terser
    ynh_npm install --location=global uglify-js
    ynh_exec_warn_less _exec_as_app_with_ruby_node yarn install --frozen-lockfile
    ynh_exec_warn_less _exec_as_app_with_ruby_node yarn cache clean
popd

#=================================================
# PREPARE THE DATABASE
#=================================================
ynh_script_progression --message="Preparing the database..."

pushd "$install_dir/discourse"
    ynh_exec_warn_less _exec_as_app_with_ruby_node RAILS_ENV=production "$install_dir/discourse/bin/bundle" exec rake db:migrate
    ynh_exec_warn_less _exec_as_app_with_ruby_node RAILS_ENV=production "$install_dir/discourse/bin/bundle" exec rake themes:update assets:precompile
popd

# Set default data (especially to have correct image URLs for subfolder install)
ynh_add_config --template="provisioning.sql" --destination="$install_dir/provisioning.sql"
ynh_psql_connect_as --user="$db_user" --password="$db_pwd" --database="$db_name" < "$install_dir/provisioning.sql"
ynh_secure_remove --file="$install_dir/provisioning.sql"

#=================================================
# CREATE DISCOURSE ADMIN USER
#=================================================
ynh_script_progression --message="Creating Discourse admin user..."

pushd "$install_dir/discourse"
    _exec_as_app_with_ruby_node RAILS_ENV=production bin/rake admin:create <<< "$admin_mail
$admin_pwd
$admin_pwd
y
"
popd

#=================================================
# CONFIGURE PLUGINS
#=================================================
ynh_script_progression --message="Configuring plugins..."

# Patch ldap-auth plugin dependency (omniauth-ldap) to fix it when using domain subfolder
# (Can only do that now because we are patching dependencies which have just been downloaded)
# Patch applied: https://github.com/omniauth/omniauth-ldap/pull/16
patch -p1 -d "$install_dir/discourse/plugins/ldap/gems/$ruby_version/gems/omniauth-ldap"*/ \
    < "../conf/ldap-auth-fix-subfolder.patch"

#=================================================
# SYSTEM CONFIGURATION
#=================================================
ynh_script_progression --message="Adding system configurations related to $app..." --weight=1

# 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 [ "$path" != "/" ] ; then
    ynh_replace_string --target_file="/etc/nginx/conf.d/$domain.d/$app.conf" \
        --match_string='$proxy_add_x_forwarded_for' \
        --replace_string='$http_your_original_ip_header'
fi
ynh_store_file_checksum --file="/etc/nginx/conf.d/$domain.d/$app.conf"

additional_env="UNICORN_WORKERS=$unicorn_workers"
ynh_add_systemd_config
yunohost service add "$app" --log "$install_dir/discourse/log/unicorn.stderr.log" "$install_dir/discourse/log/unicorn.stdout.log" "$install_dir/discourse/log/production.log"


# Use logrotate to manage application logfile(s)
ynh_use_logrotate --logfile="$install_dir/discourse/log/unicorn.stderr.log"
ynh_use_logrotate --logfile="$install_dir/discourse/log/unicorn.stdout.log"
ynh_use_logrotate --logfile="$install_dir/discourse/log/production.log"

#=================================================
# START SYSTEMD SERVICE
#=================================================
ynh_script_progression --message="Starting $app's systemd service..."

# Start a systemd service
ynh_systemd_action --service_name="$app" --action="start" --log_path="$install_dir/discourse/log/unicorn.stderr.log" --line_match="INFO -- : worker=$((unicorn_workers-1)) ready"

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

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