#!/usr/bin/env bash

set -eo pipefail

prepare_docs_log() {
  echo "[prepare docs release] -- $@"
}

# Only run for tagged commits
if [ -z "$(git tag -l --points-at HEAD)" ]; then
  prepare_docs_log "Skipping non-tagged commit."
  exit 0
fi

DOCS_DIR="./docs"
DIST_DIR="./dist/docs"
BRANCHES_DIR="${DIST_DIR}/branches"
API_SPEC_FILE="${DOCS_DIR}/openapi.yaml"

redoc_bundle_file=$(mktemp)
git_ref_version=$(git describe --always)
branch_docs_dir="${BRANCHES_DIR}/${git_ref_version}"

# Build Redoc bundle (a single HTML file)
redoc-cli bundle ${API_SPEC_FILE} -o ${redoc_bundle_file}

# Check out current stuff from gh-pages (we'll append to it)
git fetch origin 'refs/heads/gh-pages:refs/heads/gh-pages'
git checkout gh-pages -- docs

# Create the docs bundle for our ref.  This will be the redoc bundle + a
# snapshot of the OpenAPI spec
mkdir -p "${branch_docs_dir}"
cp "${API_SPEC_FILE}" "${branch_docs_dir}"
cp "${redoc_bundle_file}" "${branch_docs_dir}/index.html"

# Create a JSON file containing a list of all branches with docs (we'll
# have an index page that renders the list).
ls "${BRANCHES_DIR}" | jq -Rc '.' | jq -sc '.' > "${DIST_DIR}/branches.json"