#!/bin/sh

. config/options $1

deps=
deps_pkg=
files=
files_pkg=

case $1 in
  get)
    deps="wget"
    deps_pkg="wget"
    ;;
  build)
    deps="gcc g++ sed patch touch nasm tar bzip2 gzip perl flex bison cp gawk makeinfo gettext gperf autoconf automake m4 cvs zip unzip mkfontscale libtool diff byacc xsltproc msgfmt"
    deps_pkg="gcc g++ sed patch fileutils nasm tar bzip2 gzip perl flex bison coreutils gawk texinfo gettext gperf autoconf automake m4 cvs zip unzip xutils libtool diff byacc xsltproc gettext"
    files="/usr/include/stdio.h /usr/include/zlib.h /usr/include/ncurses.h"
    files_pkg="libc6-dev zlib1g-dev libncurses5-dev"
    ;;
  qemu)
    if [ ! `which qemu` ]; then
      echo "Your system doesn't seem to have QEMU installed"
      exit 1
    fi
    ;;
esac

getarg() {
  eval echo \${$(($1+2))}
}

i=0
while dep=`getarg $i $deps` && [ -n "$dep" ]; do
  [ -z "`which $dep 2>/dev/null`" ] && need="$need $dep" && need_pkg="$need_pkg `getarg $i $deps_pkg`"
  i=$(($i+1))
done

i=0
while file=`getarg $i $files` && [ -n "$file" ]; do
  [ ! -f $file ] && need="$need $file" && need_pkg="$need_pkg `getarg $i $files_pkg`"
  i=$(($i+1))
done

if [ -n "$need" ]; then
  echo "**** Your system lacks the following tools needed to $1 $DISTRONAME ****"
  echo $need

  [ -f /etc/lsb-release ] && . /etc/lsb-release

  if [ -n "`which aptitude 2>/dev/null`" ]; then
    DISTRO="a Debian" 
    [ "$DISTRIB_ID" = "Ubuntu" ] && DISTRO="an Ubuntu"
    echo "**** You seem to use $DISTRO system ****"
    read -p "would you like to install the needed tools ? (y/n) " ans
    [ "$ans" = "y" ] && sudo aptitude install $need_pkg
  elif [ -f /etc/mandrake-release -a -n "`which urpmi 2>/dev/null`" ]; then
    echo "**** You seem to use a mandrake system ****"
    read -p "would you like to install the needed tools ? (y/n) " ans
    [ "$ans" = "y" ] && sudo urpmi $need_pkg
  elif [ -f /etc/gentoo-release -a -n "`which emerge 2>/dev/null`" ]; then
    echo "**** You seem to use a gentoo system ****"
    read -p "would you like to install the needed tools ? (y/n) " ans
    [ "$ans" = "y" ] && sudo emerge -D $need_pkg
  elif [ -f /etc/fedora-release -a -n "`which yum 2>/dev/null`" ]; then
    echo "**** You seem to use a fedora system ****"
    read -p "would you like to install the needed tools ? (y/n) " ans
    [ "$ans" = "y" ] && sudo yum install $need_pkg
  else
    echo "********"
    exit 1
  fi
fi


need=""
need_pkg=""

i=0
while dep=`getarg $i $deps` && [ -n "$dep" ]; do
  [ -z "`which $dep 2>/dev/null`" ] && need="$need $dep" && need_pkg="$need_pkg `getarg $i $deps_pkg`"
  i=$(($i+1))
done

i=0
while file=`getarg $i $files` && [ -n "$file" ]; do
  [ ! -f $file ] && need="$need $file" && need_pkg="$need_pkg `getarg $i $files_pkg`"
  i=$(($i+1))
done

if [ -n "$need" ]; then
  echo "**** The following packages were not installed correctly ****"
  echo $need_pkg
  echo "********"
  exit 1
fi