#!/bin/bash

# Write to log
wrlog() {
    echo "$1" >>"${LOG_FILE:?}"
}

# Write to stdout/stderr and log
echlog() {
    local dt
    dt="$(date +"%Y-%m-%dT%H:%M:%S")"

    if [ -z "$1" ] && [ -z "$2" ]; then
        echo ""
        wrlog ""
    elif [ -n "$1" ]; then
        echo "$dt $1"
        wrlog "$dt $1"
    elif [ -n "$2" ]; then
        echo "$dt $2" 1>&2
        wrlog "$dt $2"
    fi
}

# Write to stderr
errlog() {
    echlog "" "$1"
}

# Rotate the log file
# TODO: Implement support for multiple rollovers and bz2 compression
rotlog() {
    local filesize maxsize="${1:-10000000}"

    if ! [ -f "$LOG_FILE" ]; then
        echlog "File doesn't exist: '$LOG_FILE'"
        return 0
    fi

    filesize="$(stat -c%s "$LOG_FILE")"

    if ((filesize > maxsize)); then
        echlog "Rotating log ($filesize > $maxsize)"
        [ -f "$LOG_FILE.0" ] && rm "$LOG_FILE.0"
        mv "$LOG_FILE" "$LOG_FILE.0"
    fi
}

# Echo $1 and exit with code $2
echxit() {
    if [ "$2" -eq 0 ]; then
        echlog "$1"
        exit "$2"
    elif [ "$2" -gt 0 ]; then
        errlog "$1"
        exit "$2"
    fi

    errlog "$1"
    errlog "Invalid exit code specified to echxit"
    exit 255
}