name: Build, Upload RootFS, and Push Docker Images, update changelog, update build info.

on:
  push:
    branches:
      - main
    paths-ignore:
      - '**/CHANGES.md'
      - '**/build-info.json'
  schedule:
    - cron: '0 12 * * 0'  # Sundays at noon UTC
  workflow_dispatch:

env:
  REPO_URL: ${{ secrets.REPO_URL }}
  GIT_USERNAME: ${{ secrets.GIT_USERNAME }}
  GIT_EMAIL: ${{ secrets.GIT_EMAIL }}
  DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
  DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}

jobs:
  build-rootfs-archives:
    runs-on: docker-build

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

      - name: Build all Debian rootfs versions sequentially
        run: |
          versions=(buster bullseye bookworm docker-build)

          for version in "${versions[@]}"; do
            echo "[INFO] Building Debian $version rootfs..."
            docker build --build-arg VERSION=$version -t fithwum/debian-$version-base .

            docker run --rm --privileged \
              -v "$(pwd)":/output \
              fithwum/debian-$version-base \
              bash base-image-script/debian-${version}_pt1.sh
          done

      - name: List output archives
        run: |
          echo "[INFO] Looking for tarballs in workspace..."
          find . -name '*.tar.bz2' -ls

  push-archives-to-repo:
    needs: build-rootfs-archives
    runs-on: docker-build

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

      - name: Clone upload repo
        run: git clone "${{ env.REPO_URL }}" upload-repo

      - name: Clean old archives in upload-repo
        run: rm -rf upload-repo/*/*.tar.bz2

      - name: Copy new archives to upload-repo
        run: |
          found=$(find . -name '*.tar.bz2')
          if [ -z "$found" ]; then
            echo "[WARNING] No .tar.bz2 archive found!"
            exit 1
          fi

          for filepath in $found; do
            version_dir=$(dirname "$filepath")
            mkdir -p upload-repo/"$version_dir"
            cp "$filepath" upload-repo/"$version_dir"/
          done

      - name: Commit and push archives if changed
        id: commit_archives
        run: |
          cd upload-repo
          git config --global user.name "${{ env.GIT_USERNAME }}"
          git config --global user.email "${{ env.GIT_EMAIL }}"

          if git status --porcelain | grep .; then
            git add **/*.tar.bz2
            git commit -m "Update base images on $(date -u +'%Y-%m-%dT%H:%M:%SZ')"
            git push
            echo "archives_changed=true" >> $GITHUB_OUTPUT
          else
            echo "[INFO] No changes to commit."
            echo "archives_changed=false" >> $GITHUB_OUTPUT
          fi

  build-and-push-docker-images:
    needs: push-archives-to-repo
    if: needs.push-archives-to-repo.outputs.archives_changed == 'true'
    runs-on: docker-build

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

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to Gitea Registry
        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login gitea.fithwum.tech -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin

      - name: Build and push Docker images
        run: |
          IMAGE_REGISTRY=gitea.fithwum.tech
          IMAGE_ORG=fithwum
          IMAGE_REPO=debian-base

          for TAG in buster bullseye bookworm docker-build; do
            FULL_IMAGE="${IMAGE_REGISTRY}/${IMAGE_ORG}/${IMAGE_REPO}:${TAG}"
            echo "[INFO] Building and pushing $FULL_IMAGE"
            docker buildx build --platform linux/amd64 --push -t "$FULL_IMAGE" "./$TAG"
          done

  generate-changelogs:
    needs: build-and-push-docker-images
    runs-on: docker-build

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

      - name: Clone upload repo
        run: git clone https://${{ secrets.GIT_USERNAME }}:${{ secrets.GIT_TOKEN }}@gitea.fithwum.tech/fithwum/debian-base.git upload-repo

      - name: Generate per-version changelogs
        run: |
          cd upload-repo
          for version in buster bullseye bookworm docker-build; do
            echo "[INFO] Updating changelog for $version"

            changelog="$version/CHANGES.md"
            mkdir -p "$(dirname "$changelog")"
            touch "$changelog"

            infofile="$version/build-info.json"
            last_commit=""
            if [ -f "$infofile" ]; then
              last_commit=$(jq -r '.commit' "$infofile")
            fi

            echo -e "\n## $(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> "$changelog"
            if [ -n "$last_commit" ]; then
              git log "${last_commit}..HEAD" --pretty=format:"- %s (%an)" | head -n 10 >> "$changelog"
            else
              git log -n 10 --pretty=format:"- %s (%an)" >> "$changelog"
            fi
          done

      - name: Commit and push changelogs if changed
        run: |
          cd upload-repo
          git config user.name "${{ secrets.GIT_USERNAME }}"
          git config user.email "${{ secrets.GIT_EMAIL }}"

          if git status --porcelain | grep .; then
            git add */CHANGES.md
            git commit -m "Update changelogs on $(date -u +'%Y-%m-%dT%H:%M:%SZ')" --no-verify
            git push
          else
            echo "[INFO] No changelog changes to commit."
          fi

  generate-build-info:
    # needs: generate-changelogs
    runs-on: docker-build

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

      - name: Clone upload repo
        run: |
          git clone "https://${{ secrets.GIT_USERNAME }}:${{ secrets.GIT_TOKEN }}@gitea.fithwum.tech/fithwum/debian-base.git" upload-repo

      - name: Generate build-info.json per version
        run: |
          cd upload-repo
          for version in buster bullseye bookworm docker-build; do
            echo "[INFO] Generating build-info.json for $version"
            mkdir -p "$version"
            infofile="$version/build-info.json"

            image="gitea.fithwum.tech/fithwum/debian-base:$version"

            digest=$(docker inspect --format='{{index .RepoDigests 0}}' "$image" || echo "unknown")
            size=$(docker image inspect "$image" --format='{{.Size}}' || echo "0")

            jq -n --arg version "$version" \
                  --arg commit "$(git rev-parse HEAD)" \
                  --arg build_time "$(date -u +'%Y-%m-%dT%H:%M:%SZ')" \
                  --arg image_tag "$image" \
                  --arg digest "$digest" \
                  --argjson size "$size" \
                  '{
                    version: $version,
                    commit: $commit,
                    build_time: $build_time,
                    image_tag: $image_tag,
                    digest: $digest,
                    image_size: $size
                  }' > "$infofile"
          done

      - name: Commit and push build-info if changed
        run: |
          cd upload-repo
          git config --global user.name "${{ env.GIT_USERNAME }}"
          git config --global user.email "${{ env.GIT_EMAIL }}"

          if git status --porcelain | grep .; then
            git add */build-info.json
            git commit -m "Update build-info on $(date -u +'%Y-%m-%dT%H:%M:%SZ')"
            git push

            # Tag the commit for each version
            for version in buster bullseye bookworm docker-build; do
              TAG="build-$version"
              # Delete local tag if exists
              git tag -d "$TAG" 2>/dev/null || true
              # Create tag on current HEAD
              git tag "$TAG"
              # Push tag to remote (force in case tag exists)
              git push origin "$TAG" --force
            done
          else
            echo "[INFO] No build-info changes to commit."
          fi