##########################
# An associative array containing varnames that the user want's to keep track of in log output (specific to each function log is being called from)
# 
# [$FUNCNAME]="string of varnames"
#
# It will keep track of vars seperately of each function that log will be used with
declare -g -A LOG_WATCH_VARS


######################
# Function: log_import
# Usage: This is used to import logging functions in an embedded shell or over ssh
log_import () {
	declare -f log_watch_vars log_unwatch_vars log
	declare -p LOG_WATCH_VARS
}

#####################
# Function: log_watch_vars
# Usage: Provide a list of variable names to add to the watchlist for the calling function
log_watch_vars () {
	local -a REQUESTED_WATCH_VARS=( $* )
	local CALLING_FUNCTION=${FUNCNAME[1]}
	local FUNC_VARS=${LOG_WATCH_VARS[$CALLING_FUNCTION]}
	local MATCH_REGEX=${FUNC_VARS//[[:space:]]/|}

	for VARNAME in ${REQUESTED_WATCH_VARS[@]}; do
		if [[ ! "$VARNAME" =~ ^$MATCH_REGEX$ ]]; then
			FUNC_VARS+=" $VARNAME"
		fi
	done

	LOG_WATCH_VARS[$CALLING_FUNCTION]=$FUNC_VARS
}

#####################
# Function: log_unwatch_vars
# Usage: Provide a list of variable names to remove from the watchlist
log_unwatch_vars () {
	## Serialize the variable names provided by user into REGEX filter "(var1|var2|var3|var4|var_n)"
	local MATCH_REGEX="(${@// /|})"
	local CALLING_FUNCTION=${FUNCNAME[1]}
	local FUNC_VARS=${LOG_WATCH_VARS[$CALLING_FUNCTION]}
	local -a TEMP_ARRAY

	for VARNAME in $FUNC_VARS; do
		if [[ ! "$VARNAME" =~ ^$MATCH_REGEX$ ]]; then
			TEMP_ARRAY+=( $VARNAME )
		fi
	done
	LOG_WATCH_VARS[$CALLING_FUNCTION]="${TEMP_ARRAY[@]}"
}

###########
# Function: log
# Usage: Use to print out debug statements for the developer (or user) to display a log output
#        including variable values & names
log () {
        local MESSAGE=${1:?"$FUNCNAME: No message provided"}
        local CALLING_FUNCTION=${FUNCNAME[1]}
        local FUNC_VARS=( ${LOG_WATCH_VARS[$CALLING_FUNCTION]} )
        local LEVEL=${2:-0}
        local DATE=$(date)
        local VAR_WATCH_STRING="" OUTPUT_MESSAGE=""

        if [[ ${CONFIG[debug]} -eq 1 ]]; then
          case ${LEVEL,,} in
            0 | i | info) LEVEL="INFO";;
            1 | w | warn) LEVEL="WARN";;
            2 | c | crit) LEVEL="CRIT";;
            3 | f | fail) LEVEL="FAIL";;
            *) LEVEL="UNDEF";;
          esac

          local VARNAME VALUE
          if [[ ${#FUNC_VARS[@]} -gt 0 ]]; then
                  for VARNAME in ${FUNC_VARS[@]}; do
                          local -n VARVALUE=$VARNAME
                          if [[ $VARVALUE == "" ]]; then
                                  VALUE='N/A'
                          else
                                  VALUE=$VARVALUE
                          fi
                          if [[ $VAR_WATCH_STRING == "" ]]; then
                                  VAR_WATCH_STRING+="$VARNAME=$VALUE "
                          else
                                  VAR_WATCH_STRING+=": $VARNAME=$VALUE "
                          fi
                  done

                  OUTPUT_MESSAGE="$DATE : $HOSTNAME : $LEVEL : $VAR_WATCH_STRING : $MESSAGE"
          else
                  OUTPUT_MESSAGE="$DATE : $HOSTNAME : $LEVEL : $MESSAGE"
          fi

          echo -e "$OUTPUT_MESSAGE"
        fi
} >&2