name: Update CDN assets

on:
  # https://unix.stackexchange.com/questions/519538/how-to-set-cron-job-for-every-5-hours
  schedule:
    - cron: '11 */1 * * *'
  workflow_dispatch:

jobs:
  publish:
    name: Update assets
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - name: Repo check
        run: |
          if [[ "$GITHUB_REPOSITORY_OWNER" != "uBlockOrigin" ]]; then
            echo "This GitHub Action is meant to deliver filter lists for uBO."
            echo "You shouldn't need to run this GitHub Action in your fork."
            echo "If you do, please customize the cron expression above, and"
            echo "the URLs below."
            exit 1
          fi
          exit 0
      - name: Clone uAssetsCDN
        uses: actions/checkout@v4
      - name: Copy shell script from uAssets
        run: |
          TMPDIR="$(mktemp -d)"
          git clone --depth=1 --single-branch --branch=master https://github.com/uBlockOrigin/uAssets.git "$TMPDIR"
          cp -v "$TMPDIR"/tools/need-patch.mjs .
          cp -v "$TMPDIR"/tools/make-diffpatch.sh .
          cp -v "$TMPDIR"/tools/update-diffpatches.sh .
      - name: Time check
        run: |
          UPDATE_PERIOD_IN_HOURS=5
          echo "CAN_DO=$(node ./need-patch.mjs delay="$UPDATE_PERIOD_IN_HOURS")" >> $GITHUB_ENV
      - name: Generate version string
        if: ${{ env.CAN_DO == 'yes' }}
        run: |
          TAGNAME=$(date -u "+%Y.%-m.%-d.")$(date -u "+%H*60+%M" | bc)
          echo "TAGNAME=$TAGNAME" >> $GITHUB_ENV
          echo "Version string is $TAGNAME"
      - name: Copy uAssets/filters to uAssetsCDN
        if: ${{ env.CAN_DO == 'yes' }}
        run: |
          TMPDIR="$(mktemp -d)"
          git clone --depth=1 --single-branch --branch=gh-pages https://github.com/uBlockOrigin/uAssets.git "$TMPDIR"
          cp -v "$TMPDIR"/filters/*.txt filters/
          cp -v "$TMPDIR"/thirdparties/*.txt thirdparties/
      - name: Copy uBlock/assets*.json to uAssetsCDN
        if: ${{ env.CAN_DO == 'yes' }}
        run: |
          TMPDIR="$(mktemp -d)"
          git clone --depth=1 --single-branch --branch=master https://github.com/gorhill/uBlock.git "$TMPDIR"
          cp -v "$TMPDIR"/assets/assets*.json ublock/
      - name: Create new patch
        if: ${{ env.CAN_DO == 'yes' }}
        run: |
          PATCHES_DIR="patches"
          ./make-diffpatch.sh "${{ env.TAGNAME }}" "$PATCHES_DIR"
      - name: Update existing patches
        if: ${{ env.CAN_DO == 'yes' }}
        run: |
          PATCHES_DIR="patches"
          FILTER_FILES=$(git ls-files --exclude-standard -- filters/*.min.txt thirdparties/*.txt)
          ./update-diffpatches.sh "$GITHUB_REPOSITORY" "$PATCHES_DIR" "$FILTER_FILES"
      - name: Commit changes, if any
        if: ${{ env.CAN_DO == 'yes' }}
        run: |
          if [[ -z $(git diff --name-only --cached) ]]; then exit 0; fi
          git config user.name github-actions
          git config user.email github-actions@github.com
          git commit -m "Update modified CDN assets to ${{ env.TAGNAME }}"
          git push origin main
          git tag ${{ env.TAGNAME }}
          git push origin ${{ env.TAGNAME }}