#!/usr/bin/env false

readonly LOGLEVEL_VERBOSE=0
readonly LOGLEVEL_DEBUG=1
readonly LOGLEVEL_INFO=2
readonly LOGLEVEL_WARN=3
readonly LOGLEVEL_ERROR=4

__logparselevel() {
    if [ -z "${LOG_LEVEL:-}" ]; then
        echo $LOGLEVEL_INFO
    elif [ "${LOG_LEVEL}" = "VERBOSE" ]; then
        echo $LOGLEVEL_VERBOSE
    elif [ "${LOG_LEVEL}" = "DEBUG" ]; then
        echo $LOGLEVEL_DEBUG
    elif [ "${LOG_LEVEL}" = "INFO" ]; then
        echo $LOGLEVEL_INFO
    elif [ "${LOG_LEVEL}" = "WARN" ]; then
        echo $LOGLEVEL_WARN
    elif [ "${LOG_LEVEL}" = "ERROR" ]; then
        echo $LOGLEVEL_ERROR
    else
        echo $LOGLEVEL_INFO
    fi
}

__logprintraw() {
    local formated_msg="$1"
    >&2 echo "${formated_msg}"
}

__logprint() {
    local level_fmt="$1"
    local msg="$2"

    local curr_time; curr_time="[$(date)]"
    local formated_msg="${curr_time}${level_fmt}: ${msg}"
    __logprintraw "${formated_msg}"
}

logcmd() {
    if [ "$(__logparselevel)" -le "$LOGLEVEL_DEBUG" ]; then
        echo "+ $*"
        { "$@" ;}
    else
        { "$@" >/dev/null 2>&1;}
    fi
}

log_expand_if_verbose() {
    if [ "$(__logparselevel)" -le "$LOGLEVEL_VERBOSE" ]; then
        printf "%s" "$1"
    fi
}

logd() {
    if [ "$(__logparselevel)" -le "$LOGLEVEL_DEBUG" ]; then
        __logprint "[DEBUG]" "$1"
    fi
}

logdraw() {
    if [ "$(__logparselevel)" -le "$LOGLEVEL_DEBUG" ]; then
        __logprint "[DEBUG]" "raw print:"
        __logprintraw "$1"
    fi
}

logi() {
    if [ "$(__logparselevel)" -le "$LOGLEVEL_INFO" ]; then
        __logprint "[INFO ]" "$1"
    fi
}

logw() {
    if [ "$(__logparselevel)" -le "$LOGLEVEL_WARN" ]; then
        __logprint "[WARN ]" "$1"
    fi
}

loge() {
    if [ "$(__logparselevel)" -le "$LOGLEVEL_ERROR" ]; then
        __logprint "[ERROR]" "$1"
    fi
}