#!/usr/bin/env bash

LOG_LEVEL=${LOG_LEVEL:=6} # 7 = debug -> 0 = emergency
NO_COLOR="${NO_COLOR:-}"
# shellcheck disable=SC2034
TRACE="0"

# _log
# -----------------------------------
# Handles all logging, all log messages are output to stderr so stdout can still be piped
#   Example: _log "info" "Some message"
# -----------------------------------
# shellcheck disable=SC2034
_log () {
  local log_level="${1}" # first option is the level, the rest is the message
  shift
  local color_success="\\x1b[32m"
  local color_debug="\\x1b[36m"
  local color_info="\\x1b[90m"
  local color_notice="\\x1b[34m"
  local color_warning="\\x1b[33m"
  local color_error="\\x1b[31m"
  local color_critical="\\x1b[1;31m"
  local color_alert="\\x1b[1;33;41m"
  local color_emergency="\\x1b[1;4;5;33;41m"
  local colorvar="color_${log_level}"
  local color="${!colorvar:-${color_error}}"
  local color_reset="\\x1b[0m"

  # If no color is set or a non-recognized terminal is used don't use colors
  if [[ "${NO_COLOR:-}" = "true" ]] || { [[ "${TERM:-}" != "xterm"* ]] && [[ "${TERM:-}" != "screen"* ]]; } || [[ ! -t 2 ]]; then
    if [[ "${NO_COLOR:-}" != "false" ]]; then
      color="";
      color_reset="";
    fi
  fi

  # all remaining arguments are to be printed
  local log_line=""

  while IFS=$'\n' read -r log_line; do
    echo -e "$(date +"%Y-%m-%d %H:%M:%S %Z") ${color}[${log_level}]${color_reset} ${log_line}" 1>&2
  done <<< "${@:-}"
}

# emergency
# -----------------------------------
# Handles emergency logging
# -----------------------------------
emergency() {
  _log emergency "${@}"; exit 1;
}

# success
# -----------------------------------
# Handles success logging
# -----------------------------------
success() {
  _log success "${@}"; true;
}

# alert
# -----------------------------------
# Handles alert logging
# -----------------------------------
alert() {
  [[ "${LOG_LEVEL:-0}" -ge 1 ]] && _log alert "${@}";
  true;
}

# critical
# -----------------------------------
# Handles critical logging
# -----------------------------------
critical() {
  [[ "${LOG_LEVEL:-0}" -ge 2 ]] && _log critical "${@}";
  true;
}

# error
# -----------------------------------
# Handles error logging
# -----------------------------------
error() {
  [[ "${LOG_LEVEL:-0}" -ge 3 ]] && _log error "${@}";
  true;
}

# warning
# -----------------------------------
# Handles warning logging
# -----------------------------------
warning() {
  [[ "${LOG_LEVEL:-0}" -ge 4 ]] && _log warning "${@}";
  true;
}

# notice
# -----------------------------------
# Handles notice logging
# -----------------------------------
notice() {
  [[ "${LOG_LEVEL:-0}" -ge 5 ]] && _log notice "${@}";
  true;
}

# info
# -----------------------------------
# Handles info logging
# -----------------------------------
info() {
  [[ "${LOG_LEVEL:-0}" -ge 6 ]] && _log info "${@}";
  true;
}

# debug
# -----------------------------------
# Handles debug logging and prepends the name of the that called debug in front of the message
# -----------------------------------
debug() {
  [[ "${LOG_LEVEL:-0}" -ge 7 ]] && _log debug "${FUNCNAME[1]}() ${*}";
  true;
}