#! /bin/sh

#
# Functions
#
usage()
{
  cat << EOF

  OpenSSL options:
    --disable-openssl      Disable OpenSSL, use built-in SHA1 implementation
    --openssl-prefix=PATH  Location of OpenSSL headers and library
    --disable-gtk          Don't build the GTK+ GUI

  Some influential environment variables:
    CC          C compiler command (default "cc")
    CFLAGS      C compiler flags (default "-g -Wall -W")

EOF
}

openssl_test()
{
  cat > testconf.c << EOF
  #include <stdio.h>
  #include <openssl/sha.h>
  int main()
  {
      SHA1( 0, 0, 0 );
  }
EOF
  if [ -n "$PREFIX" ]; then
    TMPFLAGS="-I$PREFIX/include -L$PREFIX/lib"
  fi
  if $CC $TMPFLAGS -o testconf testconf.c -lcrypto > /dev/null 2>&1
  then
    echo "OpenSSL: yes"
    DEFINES="$DEFINES HAVE_OPENSSL"
    LINKLIBS="$LINKLIBS -lcrypto"
  else
    echo "OpenSSL: no, using built-in SHA1 implementation"
  fi
  rm -f testconf.c testconf
}

gtk_test()
{
  if pkg-config gtk+-2.0 > /dev/null 2>&1
  then
    cat > testconf.c << EOF
    #include <gtk/gtk.h>
    int main()
    {
      gtk_main();
    }
EOF
    if $CC `pkg-config gtk+-2.0 --cflags --libs` -o testconf testconf.c > /dev/null 2>&1
    then
      echo "GTK+:    yes"
      GTK=yes
      GTKCCFLAGS=`pkg-config gtk+-2.0 --cflags`
      GTKLINKLIBS=`pkg-config gtk+-2.0 --libs`
    else
      echo "GTK+:    no"
      GTK=no
    fi
    rm -f testconf.c testconf
  else
    echo "GTK+:    no"
    GTK=no
  fi
}

#
# Defaults settings
#
CC="${CC-cc}"
CFLAGS="${CFLAGS--g -Wall -W}"
# For > 2 GB files
DEFINES="_FILE_OFFSET_BITS=64 _LARGEFILE_SOURCE"
# For asprintf
DEFINES="$DEFINES _GNU_SOURCE"
openssl_disable=0
gtk_disable=0
GTK=no
GTKCCFLAGS=
GTKLINKLIBS=

#
# Parse options
#
while [ $# -ne 0 ]; do
  param=`expr "opt$1" : 'opt[^=]*=\(.*\)'`

  case "x$1" in
    x--disable-openssl)
      openssl_disable="1";
      ;;
    x--openssl-prefix=*)
      OPENSSL_PREFIX="$param";
      ;;
    x--disable-gtk)
      gtk_disable="1";
      ;;
    x--help)
      usage
      exit 0
      ;;
  esac
  shift
done

#
# System-specific flags
#
SYSTEM=`uname -s`
case $SYSTEM in
  BeOS)
    DEFINES="$DEFINES SYS_BEOS"

    RELEASE=`uname -r`
    case $RELEASE in
      6.0|5.0.4) # Zeta or R5 / BONE beta 7
        SYSTEM="$SYSTEM / BONE"
        LINKLIBS="$LINKLIBS -lbind -lsocket"
        ;;
      5.0*)      # R5 / net_server
        SYSTEM="$SYSTEM / net_server"
        DEFINES="$DEFINES BEOS_NETSERVER"
        LINKLIBS="$LINKLIBS -lnet"
        ;;
      *)
        echo "Unsupported BeOS version"
        exit 1 ;;
    esac
    ;;

  Darwin)
    DEFINES="$DEFINES SYS_DARWIN"
    LINKLIBS="$LINKLIBS -lpthread"
    ;;

  FreeBSD)
    DEFINES="$DEFINES SYS_FREEBSD"
    LINKLIBS="$LINKLIBS -pthread"
    ;;

  NetBSD)
    DEFINES="$DEFINES SYS_NETBSD"
    LINKLIBS="$LINKLIBS -lpthread"
    ;;

  Linux)
    DEFINES="$DEFINES SYS_LINUX"
    LINKLIBS="$LINKLIBS -lpthread"
    ;;

  *)
    echo "Unsupported operating system"
    exit 1 ;;
esac
echo "System:  $SYSTEM"

#
# OpenSSL settings
#
if [ ${openssl_disable} = 1 ]; then
  echo "OpenSSL: no, using built-in SHA1 implementation"
else
    openssl_test
fi

#
# GTK settings
#
if [ ${gtk_disable} = 1 ]; then
  echo "GTK+:    no"
else
    gtk_test
fi

#
# Generate config.jam
#
rm -f config.jam
cat > config.jam << EOF
CC          = $CC ;
LINK        = $CC ;
CCFLAGS     = $CFLAGS ;
DEFINES     = $DEFINES ;
LINKLIBS    = $LINKLIBS ;
GTK         = $GTK ;
GTKCCFLAGS  = $GTKCCFLAGS ;
GTKLINKLIBS = $GTKLINKLIBS ;
EOF
if [ -n "$OPENSSL_PREFIX" ]; then
cat >> config.jam << EOF
HDRS       += $OPENSSL_PREFIX/include ;
LINKFLAGS  += -L$OPENSSL_PREFIX/lib ;
EOF
fi

echo
echo "To build Transmission, run 'jam'."