# Check if a YunoHost user exists
#
# example: ynh_user_exists 'toto' || exit 1
#
# usage: ynh_user_exists username
# | arg: username - the username to check
ynh_user_exists() {
    sudo yunohost user list --output-as json | grep -q "\"username\": \"${1}\""
}

# Retrieve a YunoHost user information
#
# example: mail=$(ynh_user_get_info 'toto' 'mail')
#
# usage: ynh_user_get_info username key
# | arg: username - the username to retrieve info from
# | arg: key - the key to retrieve
# | ret: string - the key's value
ynh_user_get_info() {
    sudo yunohost user info "$1" --output-as plain | ynh_get_plain_key "$2"
}

# Get the list of YunoHost users
#
# example: for u in $(ynh_user_list); do ...
#
# usage: ynh_user_list
# | ret: string - one username per line
ynh_user_list() {
    sudo yunohost user list --output-as plain --quiet \
      | awk '/^##username$/{getline; print}'
}

# Check if a user exists on the system
#
# usage: ynh_system_user_exists username
# | arg: username - the username to check
ynh_system_user_exists() {
    getent passwd "$1" &>/dev/null
}

# Create a system user
#
# examples:
#   - ynh_system_user_create --username=nextcloud -> creates a nextcloud user with
#    no home directory and /usr/sbin/nologin login shell (hence no login capability)
#   - ynh_system_user_create --username=discourse --home_dir=/var/www/discourse --use_shell --> creates a
#    discourse user using /var/www/discourse as home directory and the default login shell
#
# usage: ynh_system_user_create --username=user_name [--home_dir=home_dir] [--use_shell]
# | arg: -u, --username - Name of the system user that will be create
# | arg: -h, --home_dir - Path of the home dir for the user. Usually the final path of the app. If this argument is omitted, the user will be created without home
# | arg: -s, --use_shell - Create a user using the default login shell if present.
# If this argument is omitted, the user will be created with /usr/sbin/nologin shell
ynh_system_user_create () {
	# Declare an array to define the options of this helper.
	local legacy_args=uh
	declare -Ar args_array=( [u]=username= [h]=home_dir= [s]=use_shell )
	local username
	local home_dir
	local use_shell
	# Manage arguments with getopts
	ynh_handle_getopts_args "$@"
 	use_shell="${use_shell:-0}"
 	home_dir="${home_dir:-}"

	if ! ynh_system_user_exists "$username"	# Check if the user exists on the system
	then	# If the user doesn't exist
		if [ -n "$home_dir" ]; then	# If a home dir is mentioned
			local user_home_dir="-d $home_dir"
		else
			local user_home_dir="--no-create-home"
		fi
		if [ $use_shell -eq 1 ]; then	# If we want a shell for the user
			local shell="" # Use default shell
		else
			local shell="--shell /usr/sbin/nologin"
		fi
		useradd $user_home_dir --system --user-group $username $shell || ynh_die "Unable to create $username system account"
	fi
}

# Delete a system user
#
# usage: ynh_system_user_delete user_name
# | arg: user_name - Name of the system user that will be create
ynh_system_user_delete () {
    if ynh_system_user_exists "$1"	# Check if the user exists on the system
    then
		echo "Remove the user $1" >&2
		sudo userdel $1
	else
		echo "The user $1 was not found" >&2
    fi
}