#!/bin/sh -e

REQUIRED='is required, but not installed.'
bc -v >/dev/null 2>&1 || { echo >&2 "'bc' $REQUIRED"; exit 1; }
[ "x`echo hello | sed s/hello/world/ 2>/dev/null`" = "xworld" ] || { echo >&2 "'sed' $REQUIRED"; exit 1; }
autoreconf --version >/dev/null 2>&1 || { echo >&2 "'autoconf' $REQUIRED"; exit 1; }

# Determine which flag sed uses for extended regular expressions.
# -E is POSIX. -r is for GNU sed older than 4.2.
echo hello | sed -E s/hello/world/ >/dev/null 2>&1 && SED_ERE=-E || SED_ERE=-r

# If libtool is not installed -> "error: Libtool library used but 'LIBTOOL' is undefined"

if [ ! -e "./m4" ]; then
mkdir m4 2>/dev/null
fi

BROTLI_ABI_HEX=`sed -n 's/#define BROTLI_ABI_VERSION 0x//p' c/common/version.h`
BROTLI_ABI_INT=`echo "ibase=16;$BROTLI_ABI_HEX" | bc`
BROTLI_ABI_CURRENT=`echo "scale=0;$BROTLI_ABI_INT / 16777216" | bc`
BROTLI_ABI_REVISION=`echo "scale=0;$BROTLI_ABI_INT / 4096 % 4096" | bc`
BROTLI_ABI_AGE=`echo "scale=0;$BROTLI_ABI_INT % 4096" | bc`
BROTLI_ABI_INFO="$BROTLI_ABI_CURRENT:$BROTLI_ABI_REVISION:$BROTLI_ABI_AGE"

BROTLI_VERSION_HEX=`sed -n 's/#define BROTLI_VERSION 0x//p' c/common/version.h`
BROTLI_VERSION_INT=`echo "ibase=16;$BROTLI_VERSION_HEX" | bc`
BROTLI_VERSION_MAJOR=`echo "scale=0;$BROTLI_VERSION_INT / 16777216" | bc`
BROTLI_VERSION_MINOR=`echo "scale=0;$BROTLI_VERSION_INT / 4096 % 4096" | bc`
BROTLI_VERSION_PATCH=`echo "scale=0;$BROTLI_VERSION_INT % 4096" | bc`
BROTLI_VERSION="$BROTLI_VERSION_MAJOR.$BROTLI_VERSION_MINOR.$BROTLI_VERSION_PATCH"

sed -i.bak "$SED_ERE" "s/[0-9]+:[0-9]+:[0-9]+/$BROTLI_ABI_INFO/" Makefile.am
sed -i.bak "$SED_ERE" "s/\[[0-9]+\.[0-9]+\.[0-9]+\]/[$BROTLI_VERSION]/" configure.ac

autoreconf --install --force --symlink || exit $?