#!/bin/bash

# CONSTANTS

MIAOU_BASH_DIR=${MIAOU_BASH_DIR:-/opt/miaou-bash}
ORIGINAL="ORIGINAL"
PREDEFINED_CONFIG_FILES=(/etc/bash.bashrc /etc/inputrc /etc/vim/vimrc)
readonly MIAOU_BASH_DIR ORIGINAL

# FUNCTIONS

function no_more_skeleton {
  [[ -e /etc/skel/.bashrc ]] && rm /etc/skel/.bashrc && echo "skeleton .bashrc removed!"
  true
}

function predefine_config_files {
  for i in "${PREDEFINED_CONFIG_FILES[@]}"; do
    local miaou_file
    miaou_file="${MIAOU_BASH_DIR}/$(basename "$i")"
    if [[ -L "$i" ]]; then
      if [[ "$(readlink "$i")" == "${miaou_file}" ]]; then
        echo "$i => MIAOU_BASH_DIR already set!"
      else
        rm "$i"
        ln -s "${miaou_file}" "$i"
        echo "$i => MIAOU_BASH_DIR freshly defined."
      fi
    else
      mv "$i" "$i.$ORIGINAL"
      ln -s "${miaou_file}" "$i"
      echo "$i => MIAOU_BASH_DIR freshly defined + .ORIGINAL backuped"
    fi
  done
}

function bin_miaou_bash {
  [[ ! -e /usr/bin/miaou-bash ]] &&
    ln -s "$MIAOU_BASH_DIR/bin/miaou-bash" /usr/bin/ &&
    echo "miaou-bash globally defined!"
}

# MAIN

set -TEeu -o pipefail
[ "$(id -u)" -ne 0 ] && echo 'root privilege required' && exit 1

no_more_skeleton
predefine_config_files
bin_miaou_bash