#!/usr/bin/env bash
# bin/compile <build-dir> <cache-dir>

set -e
set -o pipefail

# Nginx 1.8.1
NGINX_VERSION="1.8.1"
NGINX_TARBALL="nginx-${NGINX_VERSION}.tar.gz"
PCRE_VERSION="8.38"
PCRE_TARBALL="pcre-${PCRE_VERSION}.tar.gz"
ZLIB_VERSION="1.2.8"
ZLIB_TARBALL="zlib-${ZLIB_VERSION}.tar.gz"

# parse and derive params
BUILD_DIR=$1
CACHE_DIR=$2
CUR_DIR=`cd $(dirname $0); cd ..; pwd`

mkdir -p $BUILD_DIR $CACHE_DIR

if [[ ! -e "$BUILD_DIR/www" ]]; then
  echo "-----> copy static files to www"
  rm -rf $CACHE_DIR/www
  mkdir -p $CACHE_DIR/www
  mv $BUILD_DIR/* $CACHE_DIR/www
  mkdir -p $BUILD_DIR/www
  mv $CACHE_DIR/www/* $BUILD_DIR/www
  # Check for a copy the nginx conf file override to the build dir
  [[ -f "$BUILD_DIR/www/nginx.conf.erb" ]] && mv $BUILD_DIR/www/nginx.conf.erb $BUILD_DIR
  [[ -f "$BUILD_DIR/www/nginx.conf.sigil" ]] && mv $BUILD_DIR/www/nginx.conf.sigil $BUILD_DIR
  [[ -f "$BUILD_DIR/www/mime.types" ]] && mv $BUILD_DIR/www/mime.types $BUILD_DIR
  [[ -f "$BUILD_DIR/www/CHECKS" ]] && mv $BUILD_DIR/www/CHECKS $BUILD_DIR
  rm -rf $CACHE_DIR/www
fi

cd $CACHE_DIR

if [[ ! -d "${NGINX_TARBALL%.tar.gz}" ]]; then
  echo "-----> download and unzip nginx"
  curl "http://nginx.org/download/${NGINX_TARBALL}" -o "${NGINX_TARBALL}"
  tar xzf "${NGINX_TARBALL}" && rm -f "${NGINX_TARBALL}"
fi

if [[ ! -d "${PCRE_TARBALL%.tar.gz}" ]]; then
  echo "-----> download and unzip pcre"
  curl "http://ftp.csx.cam.ac.uk/pub/software/programming/pcre/${PCRE_TARBALL}" -o "${PCRE_TARBALL}"
  tar xzf "${PCRE_TARBALL}" && rm -f "${PCRE_TARBALL}"
fi

if [[ ! -d "${ZLIB_TARBALL%.tar.gz}" ]]; then
  echo "-----> download and unzip zlib"
  curl "http://zlib.net/${ZLIB_TARBALL}" -o "${ZLIB_TARBALL}"
  tar xzf "${ZLIB_TARBALL}" && rm -rf "${ZLIB_TARBALL}"
fi

cd "nginx-${NGINX_VERSION}"
if [[ ! -f "${CACHE_DIR}/bin/nginx" ]]; then
  echo "-----> compile static nginx"
  mkdir $BUILD_DIR/nginx
  ./configure \
    --with-cpu-opt=generic \
    --prefix=$BUILD_DIR/nginx \
    --with-pcre=../pcre-${PCRE_VERSION} \
    --sbin-path=. \
    --pid-path=./nginx.pid \
    --conf-path=./nginx.conf \
    --with-ld-opt="-static" \
    --with-http_spdy_module \
    --with-http_stub_status_module \
    --with-http_gzip_static_module \
    --with-file-aio \
    --with-zlib=../zlib-${ZLIB_VERSION} \
    --with-pcre \
    --with-cc-opt="-O2 -static -static-libgcc" \
    --without-http_charset_module \
    --without-http_ssi_module \
    --without-http_userid_module \
    --without-http_access_module \
    --without-http_auth_basic_module \
    --without-http_autoindex_module \
    --without-http_geo_module \
    --without-http_map_module \
    --without-http_split_clients_module \
    --without-http_referer_module \
    --without-http_proxy_module \
    --without-http_fastcgi_module \
    --without-http_uwsgi_module \
    --without-http_scgi_module \
    --without-http_memcached_module \
    --without-http_empty_gif_module \
    --without-http_browser_module \
    --without-http_upstream_ip_hash_module \
    --without-http_upstream_least_conn_module \
    --without-http_upstream_keepalive_module \
    --without-mail_pop3_module \
    --without-mail_imap_module \
    --without-mail_smtp_module

  sed -i "/CFLAGS/s/ \-O //g" objs/Makefile

  make && make install

  rm -rf $CACHE_DIR/bin && mkdir -p $CACHE_DIR/bin/
  cp -r $BUILD_DIR/nginx/* $CACHE_DIR/bin/

else
  echo "-----> reuse nginx from cache"
  mkdir -p $BUILD_DIR/nginx
  cp -r $CACHE_DIR/bin/* $BUILD_DIR/nginx/
fi

# Update the PATH
mkdir -p $BUILD_DIR/.profile.d
cat > $BUILD_DIR/.profile.d/nginx.sh <<"EOF"
export PATH="$PATH:$HOME/nginx"
EOF

cd $CUR_DIR


# Test for user override on nginx config...
if [ -f $BUILD_DIR/nginx.conf.erb ] ; then
  echo "-----> using user provided nginx.conf.erb"
  cp $BUILD_DIR/nginx.conf.erb $BUILD_DIR/nginx/nginx.conf.erb

# Dokku 0.5.0+ uses nginx.conf.sigil for customizing the
# Nginx configuration, so let's check if it exists
elif [ -f $BUILD_DIR/nginx.conf.sigil ] ; then
  echo "-----> using user provided nginx.conf.sigil"
  cp $BUILD_DIR/nginx.conf.sigil $BUILD_DIR/nginx/nginx.conf.sigil

# ...else, force default file
else
  echo "-----> using default nginx.conf.erb"
  cp conf/nginx.conf.erb $BUILD_DIR/nginx/nginx.conf.erb
fi

# build mime.types unless overridden by user
if [ -f $BUILD_DIR/mime.types ] ; then
  echo "-----> using user provided mime.types"
  cp $BUILD_DIR/mime.types $BUILD_DIR/nginx/mime.types

else
  echo "-----> using default mime.types"
  cp conf/mime.types $BUILD_DIR/nginx/mime.types
fi


# build a startup script
cat <<EOF >"$BUILD_DIR/start_nginx"
#!/usr/bin/env bash
rm -f /app/nginx/nginx.conf
erb /app/nginx/nginx.conf.erb > /app/nginx/nginx.conf
exec /app/nginx/nginx -p /app/nginx -c /app/nginx/nginx.conf
EOF
chmod +x "$BUILD_DIR/start_nginx"