#!/bin/bash

TYPE=$(echo "$1" | tr '[A-Z]' '[a-z]')
OS=$(uname)
ID='unknown'
CODENAME='unknown'
RELEASE='unknown'
ARCH='unknown'

# detect centos
grep 'centos' /etc/issue -i -q
if [ $? = '0' ]; then
    ID='centos'
    RELEASE=$(cat /etc/redhat-release | grep -o 'release [0-9]' | cut -d " " -f2)
elif [ -f '/etc/redhat-release' ]; then
    ID='centos'
    RELEASE=$(cat /etc/redhat-release | grep -o 'release [0-9]' | cut -d " " -f2)
# could be debian or ubuntu
elif [ $(which lsb_release) ]; then
    ID=$(lsb_release -i | cut -f2)
    CODENAME=$(lsb_release -c | cut -f2)
    RELEASE=$(lsb_release -r | cut -f2)
elif [ -f '/etc/lsb-release' ]; then
    ID=$(cat /etc/lsb-release | grep DISTRIB_ID | cut -d "=" -f2)
    CODENAME=$(cat /etc/lsb-release | grep DISTRIB_CODENAME | cut -d "=" -f2)
    RELEASE=$(cat /etc/lsb-release | grep DISTRIB_RELEASE | cut -d "=" -f2)
elif [ -f '/etc/issue' ]; then
    ID=$(head -1 /etc/issue | cut -d " " -f1)
    if [ -f '/etc/debian_version' ]; then
      RELEASE=$(</etc/debian_version)
    else
      RELEASE=$(head -1 /etc/issue | cut -d " " -f2)
    fi
fi

declare -A info

info[id]=$(echo "${ID}" | tr '[A-Z]' '[a-z]')
info[codename]=$(echo "${CODENAME}" | tr '[A-Z]' '[a-z]')
info[release]=$(echo "${RELEASE}" | tr '[A-Z]' '[a-z]')
info[arch]=$(uname -m)

if [ "${TYPE}" ] ; then
    echo "${info[${TYPE}]}"

    exit 0
fi

echo -e "ID\t\t${info[id]}"
echo -e "CODENAME\t${info[codename]}"
echo -e "RELEASE\t\t${info[release]}"
echo -e "ARCH\t\t${info[arch]}"