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

on:
  push:
    branches:
      - main
    paths-ignore:
      - '**/CHANGES.md'
      - '**/build-info.json'
      - '**/debian-*.tar.bz2'
      - '/sha256sums.txt'
  schedule:
    - cron: '0 12 * * 0'  # Sunday at noon UTC

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 }}
  VERSIONS: "buster bullseye bookworm trixie"
  # OUTPUT_DIR: /mnt/unraid_output/act_runner_output
  OUTPUT_DIR: ./output

jobs:
  build-and-push-rootfs-archives:
    runs-on: vm1-docker-build2
    outputs:
      archives_changed: ${{ steps.commit_archives.outputs.archives_changed }}
    steps:
      - name: Checkout source
        uses: actions/checkout@v3

      - name: Create output directory
        run: mkdir -p ./output

      - name: Build all Debian rootfs versions into volumes and extract
        run: |
          versions=($VERSIONS)
          for version in "${versions[@]}"; do
            echo "[INFO] Building $version..."
            volume_name="build_output_$version"
            docker volume create "$volume_name"

            docker build --build-arg VERSION=$version -t fithwum/debian-$version-base .

            docker run --rm --privileged \
              -v "$volume_name:/output" \
              -e VERSION="$version" \
              fithwum/debian-$version-base \
              bash -c "/scripts/bootstrap-rootfs.sh \"$version\""

            # Extract the output file from the volume
            container_id=$(docker create -v "$volume_name:/output" debian)
            mkdir -p ./output/$version
            docker cp "$container_id:/output/$version/debian-$version.tar.bz2" ./output/$version/
            docker rm "$container_id"
          done

      - name: Validate that archives exist for each version
        run: |
          IFS=' ' read -r -a versions <<< "$VERSIONS"
          for version in "${versions[@]}"; do
            path="./output/$version/debian-$version.tar.bz2"
            if [[ ! -f "$path" ]]; then
              echo "[ERROR] Missing archive: $path"
              exit 1
            else
              echo "[OK] Found: $path"
            fi
          done

      - name: Clone upload repo
        run: |
          GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
          git clone --depth=1 "https://${{ env.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/debian-base.git" upload-repo

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

      - name: Copy new archives to upload-repo
        run: |
          for filepath in ./output/*/debian-*.tar.bz2; do
            version_dir=$(basename "$(dirname "$filepath")")
            mkdir -p "upload-repo/$version_dir"
            cp "$filepath" "upload-repo/$version_dir/"
          done

      - name: Calculate and store sha256sums in upload-repo
        run: |
          cd upload-repo
          rm -f sha256sums.txt
          for tarball in */debian-*.tar.bz2; do
            echo "[INFO] Processing: $tarball"
            checksum=$(sha256sum "$tarball" | awk '{print $1}')
            echo "$checksum  $tarball" >> sha256sums.txt
          done
          echo "[INFO] SHA256 contents:"
          cat sha256sums.txt

      - name: Commit and push files 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 sha256sums.txt || true
            git commit -m "Update base images and checksum on $(date -u +'%Y-%m-%dT%H:%M:%SZ') [skip ci]"
            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: build-and-push-rootfs-archives
    if: always()
    # if: needs.build-and-push-rootfs-archives.outputs.archives_changed == 'true'
    runs-on: doc1-docker-build
    steps:
      - name: Checkout source
        uses: actions/checkout@v3

      - name: Wait for archives to appear in upload repo
        run: |
          echo "[INFO] Waiting for archives to appear in upload-repo..."

          mkdir -p temp-check
          cd temp-check

          # Retry loop for cloning the upload-repo
          for i in {1..10}; do
            echo "[INFO] Attempt $i: Cloning upload-repo..."
            if git clone --depth=1 "https://${{ secrets.GIT_USERNAME }}:${{ secrets.GIT_TOKEN }}@gitea.fithwum.tech/fithwum/debian-base.git"; then
              break
            fi
            echo "[WARN] Clone failed. Retrying in 10 seconds..."
            sleep 10
          done

          if [ ! -d "debian-base" ]; then
            echo "[ERROR] Failed to clone upload-repo after retries."
            exit 1
          fi

          cd debian-base

          # Wait for all versions to show up
          missing_versions=()
          for version in $VERSIONS; do
            for i in {1..30}; do
              if [[ ! -f "$version/debian-$version.tar.bz2" ]]; then
              missing_versions+=("$version")
            fi
            done
            if [[ ${#missing_versions[@]} -gt 0 ]]; then
              echo "[ERROR] Missing archives for: ${missing_versions[*]}"
              exit 1
            fi
          done

      - 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 $VERSIONS; do
            FULL_IMAGE="${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-rootfs-archives
    runs-on: doc2-docker-build
    steps:
      - name: Checkout source
        uses: actions/checkout@v3

      - name: Create temporary changelog workspace
        run: mkdir changelogs

      - name: Clone upload repo
        run: |
          GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
          git clone --depth=3 "https://${{ env.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/debian-base.git" upload-repo

      - name: Generate changelogs from git log
        run: |
          for version in $VERSIONS; do
            echo "[INFO] Generating changelog for $version"
            changelog="changelogs/$version/CHANGES.md"
            mkdir -p "$(dirname "$changelog")"

            echo -e "## $(date -u +'%Y-%m-%dT%H:%M:%SZ')\n" >> "$changelog"
            git log -n 10 --pretty=format:"- %s (%an)" >> "$changelog"
          done

      - name: Copy generated changelogs into repo
        run: |
          for version in $VERSIONS; do
            mkdir -p "upload-repo/$version"
            cp "changelogs/$version/CHANGES.md" "upload-repo/$version/CHANGES.md"
          done

      - name: Commit and push changelogs if changed
        run: |
          cd upload-repo
          git config user.name "${{ env.GIT_USERNAME }}"
          git config user.email "${{ env.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: build-and-push-docker-images
    runs-on: doc2-docker-build
    steps:
    - name: Checkout source
      uses: actions/checkout@v3

    - name: Prepare temporary build-info workspace
      run: mkdir -p buildinfo

    - name: Clone upload repo
      run: |
        GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
        git clone --depth=1 "https://${{ env.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/debian-base.git" upload-repo

    - name: Copy sha256sums.txt
      run: |
        if [[ -f upload-repo/sha256sums.txt ]]; then
          cp upload-repo/sha256sums.txt buildinfo/
        else
          echo "[ERROR] sha256sums.txt missing in upload-repo!"
          exit 1
        fi

    - name: Generate build-info.json files
      run: |
        human_size() {
          local b=$1
          local d=''
          local s=0
          local S=(B KB MB GB TB)
          while ((b >= 1024 && s < ${#S[@]}-1)); do
            d=$((b % 1024))
            b=$((b / 1024))
            s=$((s + 1))
          done
          printf "%s%s\n" "$b" "${S[$s]}"
        }

        cd buildinfo
        for version in $VERSIONS; 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"
          
          # Pull image before inspecting to ensure metadata is available
          if ! docker pull "$image"; then
            echo "[WARN] Failed to pull $image — setting fields to 'unknown/0'"
            digest="unknown"
            size_bytes=0
          else
            digest=$(docker inspect --format='{{if .RepoDigests}}{{index .RepoDigests 0}}{{else}}unknown{{end}}' "$image" 2>/dev/null || echo "unknown")
            size_bytes=$(docker image inspect "$image" --format='{{.Size}}' 2>/dev/null || echo "0")
            size_bytes=${size_bytes//[^0-9]/}
            if [[ -z "$size_bytes" ]]; then size_bytes=0; fi
          fi

          size_human=$(human_size "$size_bytes")

          # Load SHA256 from file if available
          TARBALL_NAME="debian-$version.tar.bz2"
          SHA256_LINE=$(grep -F "$TARBALL_NAME" sha256sums.txt || true)
          if [[ -z "$SHA256_LINE" ]]; then
            echo "[WARN] SHA256 for $TARBALL_NAME not found!"
            SHA256="unknown"
          else
            SHA256=$(echo "$SHA256_LINE" | awk '{print $1}')
            echo "[INFO] SHA256 for $TARBALL_NAME: $SHA256"
          fi

          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 "$digest" \
            --arg image_size "$size_human" \
            --argjson image_size_bytes "$size_bytes" \
            --arg sha256 "$sha256" \
            '{
              version: $version,
              commit: $commit,
              build_time: $build_time,
              image_tag: $image_tag,
              digest: $digest,
              image_size: $image_size,
              image_size_bytes: $image_size_bytes,
              rootfs_sha256: $sha256
            }' > "$infofile"
        done

    - name: Clone upload repo
      run: |
        rm -rf upload-repo
        GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
        git clone --depth=1 "https://${{ env.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/debian-base.git" upload-repo

    - name: Copy build-info.json into repo
      run: |
        for version in $VERSIONS; do
          mkdir -p "upload-repo/$version"
          cp "buildinfo/$version/build-info.json" "upload-repo/$version/build-info.json"
        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

          for version in $VERSIONS; do
            TAG="build-$version"
            git tag -d "$TAG" 2>/dev/null || true
            git tag "$TAG"
            git push origin "$TAG" --force
          done
        else
          echo "[INFO] No build-info changes to commit."
        fi