name: Build and Push Teamspeak alpine

on:
  push:
    branches:
      - main
    paths:
      - '.gitea/workflows/teamspeak-build-alpine.yml'
      - 'alpine/Dockerfile'
      - 'alpine/*.sh'
      - '!.cache/*'
      - '!alpine/CHANGES.md'
      - '!alpine/build-info.json'
  schedule:
    - cron: '15 21 * * 0'

env:
  IMAGE_REGISTRY: ${{ secrets.REPO_URL }}
  IMAGE_ORG: ${{ secrets.GIT_USERNAME }}
  IMAGE_REPO_TS: teamspeak-server
  CACHE_DIR: .cache

jobs:
  build-alpine:
    runs-on: vm-docker-build2
    outputs:
      built: 'true'
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Login to Docker registry
        run: |
          echo "${{ secrets.GIT_TOKEN }}" | docker login gitea.fithwum.tech -u "${{ secrets.GIT_USERNAME }}" --password-stdin

      - name: Clear BuildKit cache
        run: |
          docker builder prune -af || true
          docker buildx prune -af || true

      - name: Build and Push Alpine Image
        run: |
          mkdir -p "${{ env.CACHE_DIR }}"
          IMAGE="${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_ORG }}/${{ env.IMAGE_REPO_TS }}:alpine"
          METAFILE="${{ env.CACHE_DIR }}/metadata-alpine.json"
          echo "[INFO] Building $IMAGE"
          docker buildx build --platform linux/amd64 --pull --no-cache --push -t "$IMAGE" --metadata-file "$METAFILE" ./alpine

  generate-build-info:
    needs: build-alpine
    if: |
      needs.build-alpine.outputs.built == 'true'
    runs-on: vm-docker-build2
    steps:
      - name: Checkout source
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Load digests from cache
        id: base_digests
        run: |
          load_digest() {
            file=".cache/$1-base.digest"
            if [ -f "$file" ]; then
              cat "$file"
            else
              echo "unknown"
            fi
          }

          echo "alpine=$(load_digest alpine)" >> $GITHUB_OUTPUT

      - name: Generate build-info.json for each variant
        env:
          IMAGE_REGISTRY: ${{ env.IMAGE_REGISTRY }}
          IMAGE_ORG: ${{ env.IMAGE_ORG }}
          IMAGE_REPO_TS: ${{ env.IMAGE_REPO_TS }}
        run: |
          variants=(alpine)

          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]}"
          }

          variants=()
          [[ "${{ needs.build-alpine.outputs.built }}" == "true" ]] && variants+=("alpine")

          for variant in "${variants[@]}"; do
            image_tag="${IMAGE_REGISTRY}/${IMAGE_ORG}/${IMAGE_REPO_TS}:${variant}"
            digest=$(docker inspect --format='{{index .RepoDigests 0}}' "$image_tag" 2>/dev/null || echo "unknown")
            size_bytes=$(docker image inspect "$image_tag" --format='{{.Size}}' 2>/dev/null || echo 0)
            size_human=$(numfmt --to=iec --suffix=B $size_bytes 2>/dev/null || echo "${size_bytes}B")
            commit_hash=$(git rev-parse HEAD)
            build_time=$(date -u +"%Y-%m-%dT%H:%M:%SZ")

            case "$variant" in
              alpine)
                base_digest="${{ steps.base_digests.outputs.alpine }}"
                ;;
            esac

            mkdir -p "$variant"
            jq -n \
              --arg version "$variant" \
              --arg commit "$commit_hash" \
              --arg build_time "$build_time" \
              --arg image_tag "$image_tag" \
              --arg digest "$digest" \
              --arg image_size "$size_human" \
              --argjson image_size_bytes "$size_bytes" \
              --arg base_digest "$base_digest" \
              '{
                version: $version,
                commit: $commit,
                build_time: $build_time,
                image_tag: $image_tag,
                digest: $digest,
                image_size: $image_size,
                image_size_bytes: $image_size_bytes,
                base_digest: $base_digest
              }' > "$variant/build-info.json"
          done

      - name: Show generated build-info.json
        run: |
          find . -name build-info.json -exec echo '--- {} ---' \; -exec cat {} \;

      - name: Commit and push build-info if changed
        run: |
          git config user.name "${{ secrets.GIT_USERNAME }}"
          git config user.email "${{ secrets.GIT_EMAIL }}"

          if git status --porcelain | grep .; then
            # Create a temporary branch
            TEMP_BRANCH="tmp-buildinfo-$(date -u +%s)"
            git checkout -b "$TEMP_BRANCH"

            git add */build-info.json
            git commit -m "Update build-info on $(date -u +'%Y-%m-%dT%H:%M:%SZ')"

            # Push temp branch
            git push origin "$TEMP_BRANCH"

            # Switch back to main
            git checkout main
            git fetch origin main

            # Merge temp branch using --allow-unrelated-histories (safe in CI)
            git merge --no-ff --no-edit "$TEMP_BRANCH" || true

            # Force push main to remote to ensure update
            git push origin main --force

            # Delete temporary branch locally and remotely
            git branch -D "$TEMP_BRANCH"
            git push origin --delete "$TEMP_BRANCH" || true
          else
            echo "[INFO] No build-info changes to commit."
          fi

  generate-changelogs:
    needs:
      - generate-build-info
    runs-on: vm-docker-build2
    steps:
      - name: Checkout source
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Sync with latest main
        run: |
          git fetch origin main
          git reset --hard origin/main

      - name: Generate changelogs only for updated variants
        run: |
          versions=("alpine")

          for version in "${versions[@]}"; 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

            # Check if last_commit exists in history, fallback to last 10 commits if not
            if ! git cat-file -e "${last_commit}^{commit}" 2>/dev/null; then
              echo "[WARN] Last commit from build-info.json not found, using last 10 commits"
              last_commit=""
            fi

          echo -e "\n## $(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> "$changelog"
          git log -n 10 --pretty=format:"- %s (%an)" \
            --no-merges \
            --invert-grep \
            --grep="Update changelogs on" >> "$changelog"
          done

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

          if git status --porcelain | grep .; then
            # Create a temporary branch
            TEMP_BRANCH="tmp-changelog-$(date -u +%s)"
            git checkout -b "$TEMP_BRANCH"

            git add */CHANGES.md
            git commit -m "Update changelogs on $(date -u +'%Y-%m-%dT%H:%M:%SZ')" --no-verify

            # Push temporary branch
            git push origin "$TEMP_BRANCH"

            # Merge temporary branch into main safely
            git checkout main
            git fetch origin main
            git merge --no-ff --no-edit "$TEMP_BRANCH"

            # Push main branch
            git push origin main

            # Delete temporary branch remotely
            git push origin --delete "$TEMP_BRANCH" || true
          else
            echo "[INFO] No changelog changes to commit."
          fi