name: Regenerate install scripts on Renovate PRs

on:
  pull_request:
    branches: [main]
    paths:
      - "config/*.binstaller.yml"

jobs:
  regen:
    if: startsWith(github.head_ref, 'renovate/')
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: read

    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Install task
        run: |
          curl -sSL https://raw.githubusercontent.com/jswank/install/main/scripts/task-install.sh | bash
          echo "${HOME}/.local/bin" >> "$GITHUB_PATH"

      - name: Install binst
        run: |
          curl -sSL https://raw.githubusercontent.com/jswank/install/main/scripts/binstaller-install.sh | bash
          echo "${HOME}/.local/bin" >> "$GITHUB_PATH"

      - name: Install yq
        run: |
          sudo wget -qO /usr/local/bin/yq https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64
          sudo chmod +x /usr/local/bin/yq

      - name: Detect changed configs
        id: changed
        run: |
          changed=$(git diff --name-only origin/main...HEAD -- 'config/*.binstaller.yml' \
            | sed 's|config/||;s|\.binstaller\.yml||' \
            | tr '\n' ' ')
          echo "binaries=${changed}" >> "$GITHUB_OUTPUT"

      - name: Extract new versions from changed configs
        id: versions
        run: |
          for binary in ${{ steps.changed.outputs.binaries }}; do
            version=$(grep -oP '(?<=embedded_checksums:\n\s{4})(v[\d.]+)' \
              "config/${binary}.binstaller.yml" || \
              grep -A 1 'embedded_checksums:' "config/${binary}.binstaller.yml" \
              | tail -1 | grep -oP 'v[\d.]+')
            echo "${binary}=${version}" >> "$GITHUB_OUTPUT"
          done

      - name: Re-embed checksums and regenerate scripts
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          for binary in ${{ steps.changed.outputs.binaries }}; do
            version=$(grep -A 1 'embedded_checksums:' "config/${binary}.binstaller.yml" \
              | tail -1 | grep -oP 'v[\d.]+')
            echo "Regenerating ${binary} at ${version}"
            binst embed-checksums \
              --config "config/${binary}.binstaller.yml" \
              --version "${version}" \
              --mode download
            binst gen \
              --config "config/${binary}.binstaller.yml" \
              -o "scripts/${binary}-install.sh"
          done

      - name: Commit regenerated scripts
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add scripts/
          git diff --cached --quiet || git commit -m "chore: regenerate install scripts"
          git push