#!/usr/bin/env bash
# SPDX-License-Identifier: MIT

# This script is executed by GitHub Actions when a PR is merged (i.e. in the `deploy` step).
set -ex

function initialize {
  if [[ -z $TLDRHOME ]]; then
    export TLDRHOME=${GITHUB_WORKSPACE:-$(pwd)}
  fi

  export TLDR_LANG_ARCHIVES_DIRECTORY="$TLDRHOME/language_archives"
  export TLDR_PDF_FILES_DIRECTORY="$TLDRHOME/scripts/pdf"
  export TLDR_ARCHIVE="tldr.zip"
  export SITE_HOME="$HOME/site"
  export SITE_REPO_SLUG="tldr-pages/tldr-pages.github.io"

  # Configure git.
  git config --global user.email "tldrbotgithub@gmail.com"
  git config --global user.name "tldr bot"
  git config --global push.default simple
  git config --global diff.zip.textconv "unzip -c -a"

  # Decrypt and add deploy key.
  eval "$(ssh-agent -s)"
  echo "${DEPLOY_KEY}"> id_ed25519
  chmod 600 id_ed25519
  ssh-add id_ed25519
}

function upload_assets {
  git clone --quiet --depth 1 git@github.com:${SITE_REPO_SLUG}.git "$SITE_HOME"
  [[ -f "$TLDR_ARCHIVE" ]] && mv -f "$TLDR_ARCHIVE" "$SITE_HOME/assets/"
  find "$TLDR_LANG_ARCHIVES_DIRECTORY" -maxdepth 1 -name "*.zip" -exec mv -f {} "$SITE_HOME/assets/" \;
  rm -rf "$TLDR_LANG_ARCHIVES_DIRECTORY"
  [[ -f "$TLDRHOME/index.json" ]] && cp -f "$TLDRHOME/index.json" "$SITE_HOME/assets/"
  find "$TLDR_PDF_FILES_DIRECTORY" -maxdepth 1 -name "*.pdf" -exec mv -f {} "$SITE_HOME/assets/" \;
  rm -rf "$TLDR_PDF_FILES_DIRECTORY"

  cd "$SITE_HOME/assets"
  sha256sum -- index.json *.zip > tldr.sha256sums

  # Check if there are changes before committing and pushing.
  if git diff --quiet; then
    echo "No changes to deploy."
    return
  fi

  git add -A
  git commit -m "[GitHub Actions] uploaded assets after commit tldr-pages/tldr@${GITHUB_SHA}"
  git push -q
  echo "Assets (pages archive, index and checksum) deployed to the static site."
}

###################################
# MAIN
###################################

initialize
upload_assets