#!/bin/bash

# Fetch latest version of source as recommended by nacl installation page
if [ ! -e nacl-source.tar.bz2 ]; then
   `wget -q -O - http://nacl.cr.yp.to/install.html | grep wget | sed -e 's/^ *//g' -e 's/^wget /wget -q -O nacl-source.tar.bz2 /'`
fi

# Extract tarball
mkdir -p  nacl-source

arlist=`find . -name libnacl.a`
arcount=`echo $arlist | wc -w`
if [ $arcount -eq 0 ]; then
   cd nacl-source
   bzip2 -d  ../nacl-source.tar | tar xvf -
   nacldir=`echo *`
   cd ${nacldir}

   ./do

   cd ..
fi

# Test which one works for us
include=`find . -name crypto_box.h | head -1`
cat <<EOF >test.c
#include <stdio.h>
#include "${include}"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

/* it's really stupid that there isn't a syscall for this */

static int fd = -1;

void randombytes(unsigned char *x,unsigned long long xlen)
{
  int i;

  if (fd == -1) {
    for (;;) {
      fd = open("/dev/urandom",O_RDONLY);
      if (fd != -1) break;
      sleep(1);
    }
  }

  while (xlen > 0) {
    if (xlen < 1048576) i = xlen; else i = 1048576;

    i = read(fd,x,i);
    if (i < 1) {
      sleep(1);
      continue;
    }

    x += i;
    xlen -= i;
  }
}
     
     unsigned char pk[crypto_box_PUBLICKEYBYTES];
     unsigned char sk[crypto_box_SECRETKEYBYTES];

int main(int argc,char **argv) {

     crypto_box_keypair(pk,sk);
printf("The compilation worked.\n");
}
EOF
for ar in $arlist
do
if [ -e test ]; then
  rm test
fi
gcc -o test test.c $ar >/dev/null 2>&1
if [ -e test ]; then
  naclbuilddir=`echo $ar | sed -e s,/libnacl.a,,`
  echo "${naclbuilddir}" > naclbuilddir.txt
fi
done
if [ -e test ]; then
  rm test
fi

includedir=`cat naclbuilddir.txt | sed s,/lib/,/include/,`
ls -1 ${includedir} | sed -e 's,^,#include "'"${includedir}"'/,' -e 's,$,",' > nacl.h