#!/bin/sh
# -*- mode: sh; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# vim: et sts=4 sw=4

#  SPDX-License-Identifier: LGPL-2.1+
#
#  Copyright © 2020 Collabora Ltd.
#  Copyright © 2020 Valve Corporation.
#
#  This file is part of steamos-customizations.
#
#  steamos-customizations is free software; you can redistribute it and/or
#  modify it under the terms of the GNU Lesser General Public License as
#  published by the Free Software Foundation; either version 2.1 of the License,
#  or (at your option) any later version.

set -e
set -u

usage() {
    cat <<EOF
Usage: ${0##*/} [options] [<message>]

Echoes the message to standard output.

It displays the text message if splash screen is running.

The splash screen is cleared if message is empty.

Options:
 -h, --help               this help message
 -l, --log-level LEVEL    the level of logs

LEVELS
 Valid levels: emergency alert critical error warning notice info debug.
EOF
}

declare -A LOG_LEVEL
LOG_LEVEL[emergency]="0"
LOG_LEVEL[fatal]="1"
LOG_LEVEL[critical]="2"
LOG_LEVEL[error]="3"
LOG_LEVEL[warning]="4"
LOG_LEVEL[notice]="5"
LOG_LEVEL[info]="6"
LOG_LEVEL[debug]="7"

declare -A LOG_LEVEL_PREFIX
LOG_LEVEL_PREFIX[emergency]="<0>"
LOG_LEVEL_PREFIX[fatal]="<1>"
LOG_LEVEL_PREFIX[critical]="<2>"
LOG_LEVEL_PREFIX[error]="<3>"
LOG_LEVEL_PREFIX[warning]="<4>"
LOG_LEVEL_PREFIX[notice]="<5>"
LOG_LEVEL_PREFIX[info]="<6>"
LOG_LEVEL_PREFIX[debug]="<7>"

declare -A PLYMOUTH_PREFIX
PLYMOUTH_PREFIX[emergency]="Emergency: "
PLYMOUTH_PREFIX[fatal]="Fatal: "
PLYMOUTH_PREFIX[critical]="Critical: "
PLYMOUTH_PREFIX[error]="Error: "
PLYMOUTH_PREFIX[warning]="Warning: "
if [[ ${STEAMOS_DEBUG:-} ]]
then
    PLYMOUTH_PREFIX[notice]="Notice: "
    PLYMOUTH_PREFIX[info]="Info: "
    PLYMOUTH_PREFIX[debug]="Debug: "
fi

if [[ "${0##*/}" != steamos-logger ]]
then
    log_level="${0##*/}"
    log_level="${log_level#steamos-}"
else
    log_level="notice"
fi

while [[ "$#" -ne 0 ]]
do
    if [[ "$1" =~ ^(-h|--help) ]]
    then
        usage
        exit
    elif [[ "$1" =~ ^(-l|--log-level) ]]
    then
        shift

        if [[ "$#" -eq 0 ]] || [[ -z ${LOG_LEVEL_PREFIX[$1]:-} ]]
        then
            echo "${!LOG_LEVEL_PREFIX[@]}"
            if [[ "$#" -eq 0 ]]
            then
                exit 0
            fi
            exit 1
        fi

        log_level="$1"
    else
        break
    fi
    shift
done

if plymouth --ping &&
   { [[ ${STEAMOS_DEBUG:-} ]] ||
     [[ "${LOG_LEVEL[$log_level]}" -lt "${LOG_LEVEL[info]}" ]]; }
then
    prefix="${PLYMOUTH_PREFIX[$log_level]:-}"
    if [[ ${prefix:-} ]]
    then
        text="$prefix"
    fi
    text+="${*:-}"

    plymouth display-message --text="$text"
    unset prefix text
fi

if [[ "$#" -eq 0 ]]
then
    exit
fi

if ! [[ -t 1 ]]
then
    prefix="${LOG_LEVEL_PREFIX[$log_level]:-}"
fi

exec printf "%s%s\n" "${prefix:-}" "${*:-}"