#!/usr/bin/env bash
# bin/compile <build-dir> <cache-dir>
set -eo pipefail; [[ $TRACE ]] && set -x

NGINX_VERSION="1.17.0"
NGINX_TARBALL="nginx-${NGINX_VERSION}.tar.gz"
PCRE_VERSION="8.45"
PCRE_TARBALL="pcre-${PCRE_VERSION}.tar.gz"
SIGIL_VERSION="0.4.0"
SIGIL_TARBALL="sigil_${SIGIL_VERSION}_Linux_x86_64.tgz"
ZLIB_VERSION="1.2.11"
ZLIB_TARBALL="zlib-${ZLIB_VERSION}.tar.gz"

suppress() {
  # shellcheck disable=SC2069
  /bin/rm --force /tmp/surpress.out 2> /dev/null; "$@" 2>&1 > /tmp/surpress.out || cat /tmp/surpress.out; /bin/rm /tmp/surpress.out;
}

# 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"

  # shellcheck disable=SC2086
  mv $BUILD_DIR/* "${CACHE_DIR}/www"
  mkdir -p "${BUILD_DIR}/www"

  # shellcheck disable=SC2086
  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 "${BUILD_DIR}/www/app-nginx.conf.sigil" ]] && mv "${BUILD_DIR}/www/app-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" "${BUILD_DIR}"
  [[ -f "${BUILD_DIR}/www/app.json" ]] && mv "${BUILD_DIR}/www/app.json" "${BUILD_DIR}"
  rm -rf "${CACHE_DIR}/www"
fi

cd "$CACHE_DIR"

if [[ ! -d "${NGINX_TARBALL%.tar.gz}" ]]; then
  echo "-----> Download and unzip nginx ${NGINX_VERSION} via http"
  curl -sSL "http://nginx.org/download/${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 ${PCRE_VERSION} via http"
  curl -sSL "https://downloads.sourceforge.net/project/pcre/pcre/${PCRE_VERSION}/${PCRE_TARBALL}" -o "${PCRE_TARBALL}"
  tar xzf "${PCRE_TARBALL}" && rm -f "${PCRE_TARBALL}"
fi

if [[ ! -d "${ZLIB_TARBALL%.tar.gz}" ]]; then
  echo "-----> Download and unzip zlib ${ZLIB_VERSION} via http"
  curl -sSL "https://github.com/madler/zlib/archive/v${ZLIB_VERSION}.tar.gz" -o "${ZLIB_TARBALL}"
  tar xzf "${ZLIB_TARBALL}" && rm -rf "${ZLIB_TARBALL}"
fi

if [[ ! -f "sigil" ]]; then
  echo "-----> Download and unzip sigil ${SIGIL_VERSION} via http"
  curl -sSL "https://github.com/gliderlabs/sigil/releases/download/v${SIGIL_VERSION}/${SIGIL_TARBALL}" -o "${SIGIL_TARBALL}"
  tar xzf "${SIGIL_TARBALL}" && rm -rf "${SIGIL_TARBALL}"
fi

mkdir -p "$BUILD_DIR/sigil"
cp -r sigil "$BUILD_DIR/sigil/"

cd "nginx-${NGINX_VERSION}"
if [[ ! -f "${CACHE_DIR}/bin/nginx" ]]; then
  echo "-----> Compiling static nginx binary"
  mkdir "$BUILD_DIR/nginx"
  suppress ./configure \
    --with-cpu-opt=generic \
    --prefix="$BUILD_DIR/nginx" \
    --with-pcre=../pcre-${PCRE_VERSION} \
    --sbin-path=. \
    --pid-path=./nginx.pid \
    --conf-path=./nginx.conf \
    --with-ld-opt="-static" \
    --with-http_stub_status_module \
    --with-http_gzip_static_module \
    --with-http_ssl_module \
    --with-file-aio \
    --with-zlib=../zlib-${ZLIB_VERSION} \
    --with-pcre \
    --with-cc-opt="-O2 -static -static-libgcc" \
    --without-http_ssi_module \
    --without-http_userid_module \
    --without-http_access_module \
    --without-http_autoindex_module \
    --without-http_geo_module \
    --without-http_map_module \
    --without-http_split_clients_module \
    --without-http_referer_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 \
    --with-http_realip_module

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

  suppress make && suppress make install

  rm -rf "${CACHE_DIR:?}/bin" && mkdir -p "$CACHE_DIR/bin/"
  # shellcheck disable=SC2086
  cp -r $BUILD_DIR/nginx/* "$CACHE_DIR/bin/"

else
  echo "-----> Reusing nginx binary from cache"
  mkdir -p "$BUILD_DIR/nginx"
  # shellcheck disable=SC2086
  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"

# Add support for app-nginx.conf.sigil
if [ -f "$BUILD_DIR/app-nginx.conf.sigil" ] ; then
  echo "-----> Using user provided app-nginx.conf.sigil"
  cp "$BUILD_DIR/app-nginx.conf.sigil" "$BUILD_DIR/nginx/app-nginx.conf.sigil"

# Allow deprecated nginx.conf.erb
elif [ -f "$BUILD_DIR/nginx.conf.erb" ] ; then
  echo "-----> DEPRECATED: Using user provided nginx.conf.erb"
  cp "$BUILD_DIR/nginx.conf.erb" "$BUILD_DIR/nginx/nginx.conf.erb"

# ...else, force default file
else
  echo "-----> Using default app-nginx.conf.sigil"
  cp conf/app-nginx.conf.sigil "$BUILD_DIR/nginx/app-nginx.conf.sigil"
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 >"$BUILD_DIR/start_nginx"
#!/usr/bin/env bash
rm -f /app/nginx/nginx.conf
if [[ -f /app/nginx/app-nginx.conf.sigil ]]; then
  /app/sigil/sigil -f /app/nginx/app-nginx.conf.sigil NGINX_ROOT="\$NGINX_ROOT" NGINX_DEFAULT_REQUEST="\$NGINX_DEFAULT_REQUEST" PORT="\$PORT" | cat -s > /app/nginx/nginx.conf
else
  erb /app/nginx/nginx.conf.erb > /app/nginx/nginx.conf
fi
exec /app/nginx/nginx -p /app/nginx -c /app/nginx/nginx.conf
EOF
chmod +x "$BUILD_DIR/start_nginx"