name: build-epubs

on:
  schedule:
    - cron: "0 6 * * *" # daily, to catch master/new releases
  push:
    branches: [main]
  workflow_dispatch:

jobs:
  build:
    runs-on: codeberg-small-lazy
    steps:
      - name: Install prerequisites
        run: |
          apt-get update
          apt-get install -y --no-install-recommends ca-certificates curl xz-utils git

      - uses: actions/checkout@v4

      - name: Install Zig 0.15.2
        run: |
          set -eux
          arch="$(uname -m)"
          tarball="zig-${arch}-linux-0.15.2.tar.xz"
          curl -fSL "https://ziglang.org/download/0.15.2/${tarball}" -o /tmp/zig.tar.xz
          mkdir -p /opt/zig
          tar -xJf /tmp/zig.tar.xz -C /opt/zig --strip-components=1
          echo "/opt/zig" >> "$GITHUB_PATH"

      - name: Build EPUBs
        run: zig build run

      - name: Commit updated EPUBs
        run: |
          set -eux
          git config user.name "ziggy"
          git config user.email "ziggy@noreply.codeberg.org"
          git add epubs/
          if git diff --cached --quiet; then
            echo "No EPUB changes."
            exit 0
          fi
          git commit -m "build: update epubs [skip ci]"
          # Uses the runner token by default; set CI_PUSH_TOKEN if it lacks push rights.
          if [ -n "${CI_PUSH_TOKEN:-}" ]; then
            git push "https://x-access-token:${CI_PUSH_TOKEN}@${GITHUB_SERVER_URL#https://}/${GITHUB_REPOSITORY}.git" HEAD:main
          else
            git push origin HEAD:main
          fi
        env:
          CI_PUSH_TOKEN: ${{ secrets.CI_PUSH_TOKEN }}