#!/bin/bash
set -euo pipefail

repository_url="https://codeberg.org/simoncarrignon/EACompanion.git"
repository_dir="/srv/EACompanion"
web_root="/var/www/html/randomdrift"
releases_dir="${web_root}/.EACompanion-releases"
public_link="${web_root}/EACompanion"

exec 9>/run/lock/eacompanion-deploy.lock
flock -n 9 || exit 0

if [[ ! -d "${repository_dir}/.git" ]]; then
  git clone --branch main --single-branch "${repository_url}" "${repository_dir}"
fi

git -C "${repository_dir}" fetch --prune origin main
revision="$(git -C "${repository_dir}" rev-parse FETCH_HEAD)"
release_dir="${releases_dir}/${revision}"

if [[ -f "${release_dir}/index.html" ]] && [[ "$(readlink -f "${public_link}" 2>/dev/null || true)" == "${release_dir}" ]]; then
  chmod 0755 "${release_dir}"
  exit 0
fi

git -C "${repository_dir}" checkout --detach --force "${revision}"
mkdir -p "${releases_dir}"

if [[ ! -f "${release_dir}/index.html" ]]; then
  staging_dir="$(mktemp -d "${releases_dir}/.${revision}.XXXXXX")"
  trap 'rm -rf -- "${staging_dir}"' EXIT

  cd "${repository_dir}"
  EA_OUTPUT_DIR="${staging_dir}" Rscript -e \
    'bookdown::render_book("index.Rmd", output_format = "bookdown::gitbook", output_dir = Sys.getenv("EA_OUTPUT_DIR"), clean = TRUE)'
  test -f "${staging_dir}/index.html"
  mv "${staging_dir}" "${release_dir}"
  trap - EXIT
fi

chmod 0755 "${release_dir}"
temporary_link="${public_link}.new"
ln -sfn "${release_dir}" "${temporary_link}"
mv -Tf "${temporary_link}" "${public_link}"