name: Build and Push Minecraft Docker Images on Debian-base update

on:
  push:
    branches:
      - master
    paths:
      - '.gitea/workflows/*.yml'
      - '**/Dockerfile'
      - '**/*.sh'
      - '!**/CHANGES.md'
      - '!**/build-info.json'
  schedule:
    - cron: '30 */6 * * *'
#############
env:
  IMAGE_REGISTRY: gitea.fithwum.tech
  IMAGE_ORG: ${{ secrets.GIT_USERNAME }}
  IMAGE_REPO_DEBIAN: debian-base
  IMAGE_REPO_MINECRAFT: minecraft
  IMAGE_TAG_DEBIAN: bookworm
  DIGEST_FILE: .cache/debian-base.digest
  VERSIONS: vanilla testing fabric

jobs:
  poll-debian-base-and-detect-changes:
    runs-on: doc-docker-build2
    outputs:
      digest_changed: ${{ steps.compare_digest.outputs.changed }}
      versions_changed: ${{ steps.check_changed_versions.outputs.versions_changed }}

    steps:
      - name: Checkout repo
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Ensure .cache exists
        run: mkdir -p .cache && touch .cache/.gitkeep

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

      - name: Get current digest of debian-base image
        id: get_digest
        run: |
          IMAGE="${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_ORG }}/${{ env.IMAGE_REPO_DEBIAN }}:${{ env.IMAGE_TAG_DEBIAN }}"
          docker pull "$IMAGE" > /dev/null
          DIGEST=$(docker inspect --format='{{index .RepoDigests 0}}' "$IMAGE")
          echo "digest=$DIGEST" >> $GITHUB_OUTPUT
          echo "$DIGEST" > .cache/debian-base.digest.new

      - name: Compare with stored digest
        id: compare_digest
        run: |
          CURRENT_DIGEST="${{ steps.get_digest.outputs.digest }}"
          LAST_DIGEST="$(cat ${{ env.DIGEST_FILE }} 2>/dev/null || echo '')"
          if [ "$CURRENT_DIGEST" = "$LAST_DIGEST" ]; then
            echo "changed=false" >> $GITHUB_OUTPUT
          else
            echo "$CURRENT_DIGEST" > ${{ env.DIGEST_FILE }}
            git config user.name "${{ secrets.GIT_USERNAME }}"
            git config user.email "${{ secrets.GIT_EMAIL }}"
            git add ${{ env.DIGEST_FILE }}
            git commit -m "Update base digest to $CURRENT_DIGEST" || true
            git push
            echo "changed=true" >> $GITHUB_OUTPUT
          fi

      - name: Detect changed Minecraft versions
        id: check_changed_versions
        run: |
          BEFORE_COMMIT="${{ github.event.before }}"
          if [ -z "$BEFORE_COMMIT" ] || ! git cat-file -e "$BEFORE_COMMIT^{commit}" 2>/dev/null; then
            BEFORE_COMMIT=$(git rev-parse HEAD~1)
          fi
          CHANGED=$(git diff --name-only "$BEFORE_COMMIT" HEAD || true)
          CHANGED_VERSIONS=""
          for version in $VERSIONS; do
            echo "$CHANGED" | grep -q "^$version/.*\.\(sh\|Dockerfile\)$" && CHANGED_VERSIONS="$CHANGED_VERSIONS $version"
          done
          CHANGED_VERSIONS=$(echo "$CHANGED_VERSIONS" | xargs) # trim whitespace
          echo "versions_changed=$CHANGED_VERSIONS" >> $GITHUB_OUTPUT

  build-minecraft-images:
    runs-on: doc-docker-build2
    needs: poll-debian-base-and-detect-changes
    if: needs.poll-debian-base-and-detect-changes.outputs.digest_changed == 'true' || needs.poll-debian-base-and-detect-changes.outputs.versions_changed != ''
    strategy:
      matrix:
        version: [vanilla, testing, fabric]
    name: Build and Push ${{ matrix.version }}
    steps:
      - name: Checkout repo
        uses: actions/checkout@v3

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

      - name: Clone Minecraft repo (with retries)
        run: |
          GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
          for i in {1..5}; do
            git clone "https://${{ secrets.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/minecraft.git" upload-repo && break
            echo "[WARN] Clone attempt $i failed. Retrying in 10s..."
            sleep 10
          done
          if [ ! -d upload-repo ]; then
            echo "[ERROR] Failed to clone Minecraft repo after retries."
            exit 1
          fi

      - name: Build and push image
        run: |
          IMAGE="$IMAGE_REGISTRY/$IMAGE_ORG/$IMAGE_REPO_MINECRAFT:${{ matrix.version }}"
          docker buildx build --platform linux/amd64 --push -t "$IMAGE" "./${{ matrix.version }}"

  generate-changelogs:
    needs: poll-debian-base-and-detect-changes
    if: needs.poll-debian-base-and-detect-changes.outputs.digest_changed == 'true' || needs.poll-debian-base-and-detect-changes.outputs.versions_changed != ''
    runs-on: doc-docker-build2
    strategy:
      matrix:
        version: [vanilla, testing, fabric]

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

      - name: Clone Minecraft repo (with retries)
        run: |
          GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
          for i in {1..5}; do
            git clone "https://${{ secrets.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/minecraft.git" upload-repo && break
            echo "[WARN] Clone attempt $i failed. Retrying in 10s..."
            sleep 10
          done
          if [ ! -d upload-repo ]; then
            echo "[ERROR] Failed to clone Minecraft repo after retries."
            exit 1
          fi

      - name: Generate changelog
        run: |
          cd upload-repo
          changelog="${{ matrix.version }}/CHANGES.md"
          mkdir -p "$(dirname "$changelog")"
          touch "$changelog"

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

          echo -e "## $(date -u +'%Y-%m-%dT%H:%M:%SZ')\n" >> "$changelog"

          if [ -n "$last_commit" ]; then
            COMMITS=$(git log "${last_commit}..HEAD" --pretty=format:"- %s (%an)" || true)
          fi

          if [ -z "$COMMITS" ]; then
            echo "[INFO] No new commits since last build. Showing latest 5 instead."
            COMMITS=$(git log -n 5 --pretty=format:"- %s (%an)" || true)
          fi

          echo "$COMMITS" >> "$changelog"

      - name: Show git status (debug)
        run: |
          cd upload-repo
          echo "[DEBUG] Git status before commit:"
          git status
          echo "[DEBUG] Git diff:"
          git diff

      - name: Commit and push changelog
        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 "${{ matrix.version }}/CHANGES.md"
            git commit -m "Update changelog for ${{ matrix.version }}" || true
            git push
          else
            echo "[INFO] No changelog changes to commit."
          fi

  generate-build-info:
    needs: generate-changelogs
    runs-on: doc-docker-build2
    strategy:
      matrix:
        version: [vanilla, testing, fabric]

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

      - name: Clone Minecraft repo (with retries)
        run: |
          GIT_CREDENTIAL="${{ secrets.GIT_TOKEN || secrets.GIT_PASSWORD }}"
          for i in {1..5}; do
            git clone "https://${{ secrets.GIT_USERNAME }}:${GIT_CREDENTIAL}@gitea.fithwum.tech/fithwum/minecraft.git" upload-repo && break
            echo "[WARN] Clone attempt $i failed. Retrying in 10s..."
            sleep 10
          done
          if [ ! -d upload-repo ]; then
            echo "[ERROR] Failed to clone Minecraft repo after retries."
            exit 1
          fi

      - name: Generate build-info.json
        run: |
          human_size() {
            local b=$1 d='' s=0 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 upload-repo
          mkdir -p "${{ matrix.version }}"
          infofile="${{ matrix.version }}/build-info.json"
          image="${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_ORG }}/${{ env.IMAGE_REPO_MINECRAFT }}:${{ matrix.version }}"

          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")

          jq -n \
            --arg version "${{ matrix.version }}" \
            --arg commit "$(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" \
            '{
              version: $version,
              commit: $commit,
              build_time: $build_time,
              image_tag: $image_tag,
              digest: $digest,
              image_size: $image_size,
              image_size_bytes: $image_size_bytes
            }' > "$infofile"

          echo "[INFO] Generated $infofile:"
          cat "$infofile"

      - name: Git status debug
        run: |
          cd upload-repo
          echo "[DEBUG] Git status before commit:"
          git status
          echo "[DEBUG] Git diff:"
          git diff "${{ matrix.version }}/build-info.json" || true

      - name: Commit and push build-info
        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 "${{ matrix.version }}/build-info.json"
            git commit -m "Update build-info for ${{ matrix.version }} on $(date -u +'%Y-%m-%dT%H:%M:%SZ')" || true
            git push

            TAG="build-${{ matrix.version }}"
            git tag -d "$TAG" 2>/dev/null || true
            git tag "$TAG"
            git push origin "$TAG" --force
          else
            echo "[INFO] No build-info changes to commit."
          fi