# .gitlab-ci.yml — Unified DOCX export: DIFF for CR branches, normal for others.
#
# This pipeline automatically detects whether the current branch is a Change
# Request (CR) branch by checking for a "CRxxxx.json" file in the history/
# folder of the specification root.
#
# - If CRxxxx.json exists: generates a tracked-changes DOCX DIFF comparing
#   the current branch against the point where it diverged from the release
#   branch (derived from the "Release" field in CRxxxx.json, e.g. Rel-19).
#   Falls back to "main" if the release branch doesn't exist.
#   The CR cover page is included based on the CRxxxx.json metadata.
#
# - If CRxxxx.json does not exist: generates a normal DOCX export with the
#   specification front page (if configured).
#
# Copy this file to the top level of your specification repository and rename
# it to ".gitlab-ci.yml". Configure the variables below as needed.

variables:
  SPEC_ROOT: "specification"        # path to the specification root folder, relative to repo root
  SPEC_NUMBER: "38XXX"              # specification number (e.g., "38413")
  FRONT_PAGE_DATA: ""              # path to front page JSON (optional, for non-CR exports)
  SPECPRESS_REPO: "https://github.com/Ericsson/specpress.git"
  SPECPRESS_REF: "main"

stages:
  - build

export-docx:
  stage: build
  image: node:20
  before_script:
    - apt-get update && apt-get install -y --no-install-recommends git libreoffice-writer python3-uno chromium jq
    - export CHROME_BIN=$(which chromium)
  script:
    - git clone --depth 1 --branch $SPECPRESS_REF $SPECPRESS_REPO /tmp/specpress
    - cd /tmp/specpress && npm ci --omit=dev && cd -
    - mkdir -p output
    - COMMIT_DATE=$(git show -s --format=%ci HEAD | awk '{print $1"_"$2}' | tr ':' '-')
    - SHORT_SHA=$(git rev-parse --short HEAD)
    - BRANCH_NAME=$(echo $CI_COMMIT_REF_NAME | tr '/' '_')
    - |
      CR_FILE="${SPEC_ROOT}/history/CRxxxx.json"
      if [ -f "$CR_FILE" ]; then
        echo "=== CR branch detected (${CR_FILE} exists) ==="
        echo "Generating DOCX DIFF with CR cover page..."

        # Derive the target branch from the Release field in CRxxxx.json
        RELEASE=$(jq -r '.Release // empty' "$CR_FILE" 2>/dev/null)
        if [ -n "$RELEASE" ]; then
          TARGET_BRANCH="Rel-${RELEASE}"
          # Verify the branch exists on the remote
          if git ls-remote --exit-code --heads origin "$TARGET_BRANCH" >/dev/null 2>&1; then
            echo "Using release branch: ${TARGET_BRANCH}"
          else
            echo "Branch ${TARGET_BRANCH} not found, falling back to main"
            TARGET_BRANCH="main"
          fi
        else
          echo "No Release field in CRxxxx.json, using main"
          TARGET_BRANCH="main"
        fi

        # Fetch enough history to find the merge-base
        git fetch origin "$TARGET_BRANCH" --unshallow 2>/dev/null || git fetch origin "$TARGET_BRANCH"

        BASE_COMMIT=$(git merge-base HEAD "origin/$TARGET_BRANCH")
        echo "Target branch: ${TARGET_BRANCH}"
        echo "Merge-base:    ${BASE_COMMIT}"
        echo "Revision:      HEAD (${SHORT_SHA})"

        DOCX_FILE="output/${COMMIT_DATE}_${SPEC_NUMBER}_DIFF_${BRANCH_NAME}_${SHORT_SHA}.docx"

        node /tmp/specpress/lib/cli/docx-diff.js \
          "$SPEC_ROOT" \
          --output "$DOCX_FILE" \
          --base "$BASE_COMMIT" \
          --revisions HEAD \
          --backend libreoffice \
          --spec-root "$SPEC_ROOT" \
          --cr-cover-page-data "$CR_FILE"
      else
        echo "=== No CRxxxx.json found — normal DOCX export ==="

        DOCX_FILE="output/${COMMIT_DATE}_${SPEC_NUMBER}_${BRANCH_NAME}_${SHORT_SHA}.docx"

        node /tmp/specpress/lib/cli/export-docx.js \
          "$SPEC_ROOT" \
          "$DOCX_FILE" \
          --spec-root "$SPEC_ROOT" \
          ${FRONT_PAGE_DATA:+--front-page-data "$FRONT_PAGE_DATA"}
      fi

      echo "Output: $DOCX_FILE"
  artifacts:
    paths:
      - output/*.docx
    expire_in: 30 days