#!/bin/bash
set -o nounset
set -o errexit

OUTPUT_DIR="$(rpm -E '%{_sourcedir}')"
SPEC_FILE="${PWD}/llhttp.spec"

usage() {
  cat 1>&2 <<EOF
Usage: $(basename "$0")

Given llhttp.spec in the working directory, download the source and the prod
and dev dependencies, each in their own tarball.

Also finds licenses for prod dependencies.

All three tarballs and the license list are copied to
${OUTPUT_DIR}.
EOF
  exit 1
}

if ! [[ -f /usr/bin/npm ]]
then 
  cat 1>&2 <<EOF
$(basename "${0}") requires npm to run

Run the following to fix this:
  sudo dnf install npm

EOF
  exit 2
fi 

if [[ $# -gt 0 ]]; then 
  usage
fi 

TMP_DIR="$(mktemp -d -t ci-XXXXXXXXXX)"
trap "cd /; rm -rf '${TMP_DIR}'" INT TERM EXIT
cd "${TMP_DIR}"

echo "Reading ${SPEC_FILE}; downloading source archive" 1>&2
VERSION="$(awk '$1 == "Version:" { print $2; exit }' "${SPEC_FILE}")"
echo "Version is ${VERSION}" 1>&2
echo "Downloading source archive" 1>&2
spectool -g "${SPEC_FILE}"

ARCHIVE="$(
  find . -mindepth 1 -maxdepth 1 -type f -name '*.tar.gz' -print -quit
)"
echo "Downloaded $(basename "${ARCHIVE}")" 1>&2

tar -xzf "${ARCHIVE}"
XDIR="$(find . -mindepth 1 -maxdepth 1 -type d -print -quit)"
echo "Extracted to $(basename "${XDIR}")" 1>&2

cd "${XDIR}"

echo "Downloading prod dependencies" 1>&2
# Compared to nodejs-packaging-bundler, we must add --ignore-scripts or npm
# unsuccessfully attempts to build the package.
npm install --no-optional --only=prod --ignore-scripts
echo "Successful prod dependencies download" 1>&2
mv node_modules/ node_modules_prod

echo "LICENSES IN BUNDLE:"
LICENSE_FILE="${TMP_DIR}/llhttp-${VERSION}-bundled-licenses.txt"
find . -name 'package.json' -exec jq '.license | strings' '{}' ';' \
    >> "${LICENSE_FILE}"
for what in '.license | objects | .type' '.licenses[] .type'
do
  find . -name 'package.json' -exec jq "${what}" '{}' ';' \
      >> "${LICENSE_FILE}" 2>/dev/null
done
sort -u -o "${LICENSE_FILE}" "${LICENSE_FILE}"

# Locate any dependencies without a provided license
find . -type f -name 'package.json' -execdir jq \
    'if .license==null and .licenses==null then .name else null end' '{}' '+' |
  grep -vE '^null$' |
  sort -u > "${TMP_DIR}/nolicense.txt"

if [[ -s "${TMP_DIR}/nolicense.txt" ]]
then
  echo -e "\e[5m\e[41mSome dependencies do not list a license. Manual verification required!\e[0m"
  cat "${TMP_DIR}/nolicense.txt"
  echo -e "\e[5m\e[41m======================================================================\e[0m"
fi

echo "Downloading dev dependencies" 1>&2
# Compared to nodejs-packaging-bundler, we must add --ignore-scripts or npm
# unsuccessfully attempts to build the package.
npm install --no-optional --only=dev --ignore-scripts
echo "Successful dev dependencies download" 1>&2
mv node_modules/ node_modules_dev

if [[ -d node_modules_prod ]]
then
  tar -czf "../llhttp-${VERSION}-nm-prod.tgz" node_modules_prod
fi
if [[ -d node_modules_dev ]]
then
  tar -czf "../llhttp-${VERSION}-nm-dev.tgz" node_modules_dev
fi

cd ..
find . -mindepth 1 -maxdepth 1 -type f \( -name "$(basename "${ARCHIVE}")" \
    -o -name "llhttp-${VERSION}*" \) -exec cp -vp '{}' "${OUTPUT_DIR}" ';'