name: Alpine Package Auto-Rebuild

on:
  schedule:
    - cron: '0 1 * * *'  # Daily at 1:00 AM UTC

jobs:
  build:
    runs-on: alpine-latest

    steps:
      - name: Checkout repo
        uses: actions/checkout@v3

      - name: Check for latest package version
        id: check
        run: |
          PACKAGE="curl"
          LATEST=$(apk policy $PACKAGE | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+[_a-zA-Z0-9.-]*' | head -n1 || echo "unknown")
          echo "latest_version=$LATEST" >> "$GITHUB_OUTPUT"

      - name: Compare with last known version
        id: compare
        run: |
          FILE=".last_version"
          [ -f "$FILE" ] && LAST=$(cat "$FILE") || LAST="none"
          echo "Last known version: $LAST"
          if [ "$LAST" != "${{ steps.check.outputs.latest_version }}" ]; then
            echo "update=true" >> "$GITHUB_OUTPUT"
          else
            echo "update=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Install Docker
        if: steps.compare.outputs.update == 'true'
        run: |
          apk add --no-cache docker bash

      - name: Build and push Docker image
        if: steps.compare.outputs.update == 'true'
        run: |
          docker build -t melody/docker-test:latest .
          echo "${{ secrets.DOCKER_PASSWORD }}" | docker login git.shork.ch -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
          docker push git.shork.ch/melody/docker-test:latest
          echo "${{ steps.check.outputs.latest_version }}" > .last_version

      - name: Commit updated version file
        if: steps.compare.outputs.update == 'true'
        run: |
          git config user.name "forgejo-runner"
          git config user.email "runner@forgejo.local"
          git add .last_version
          git commit -m "Update tracked version to ${{ steps.check.outputs.latest_version }}"
          git push