# .gitlab-ci-validate-cr.yml — Block merge requests with invalid CR metadata.
#
# This job runs on merge requests targeting "main" or "Rel-*" branches and
# fails (blocking the merge) if any of the following conditions is met:
#
#   a) No CRxxxx.json exists in SPEC_ROOT/history/
#   b) CRxxxx.json does not match the CR cover page schema
#   c) CRxxxx.json has no "CR" field
#   d) The "Release" field does not match the target branch (ignored for main)
#   e) A CRYYYY.json (where YYYY is the zero-padded CR number) already exists
#      in the history/ folder on the source or target branch
#
# Include this file in your .gitlab-ci.yml or copy it to your repository root.
# Configure the SPEC_ROOT variable to match your specification layout.

variables:
  SPEC_ROOT: "specification"
  SPECPRESS_REPO: "https://github.com/Ericsson/specpress.git"
  SPECPRESS_REF: "main"

stages:
  - validate

validate-cr:
  stage: validate
  image: node:20
  before_script:
    - apt-get update && apt-get install -y --no-install-recommends git jq
    - git clone --depth 1 --branch $SPECPRESS_REF $SPECPRESS_REPO /tmp/specpress
    - cd /tmp/specpress && npm ci --omit=dev && cd -
  script:
    - |
      CR_FILE="${SPEC_ROOT}/history/CRxxxx.json"
      HISTORY_DIR="${SPEC_ROOT}/history"
      TARGET="$CI_MERGE_REQUEST_TARGET_BRANCH_NAME"

      # --- (a) CRxxxx.json must exist ---
      if [ ! -f "$CR_FILE" ]; then
        echo "ERROR: $CR_FILE not found. A CR metadata file is required for merge requests."
        exit 1
      fi
      echo "✓ $CR_FILE exists"

      # --- (b) CRxxxx.json must match the schema ---
      VALIDATION=$(node -e "
        const { loadCRCoverPageData } = require('/tmp/specpress/lib/common/crCoverPageLoader');
        const path = require('path');
        const result = loadCRCoverPageData(path.resolve('$CR_FILE'));
        if (!result.valid) {
          console.log('ERRORS:' + result.errors.join('; '));
          process.exit(1);
        }
      " 2>&1) || {
        echo "ERROR: $CR_FILE does not match the schema."
        echo "$VALIDATION" | grep "^ERRORS:" | sed 's/^ERRORS:/  /'
        exit 1
      }
      echo "✓ Schema validation passed"

      # --- (c) CR field must be present ---
      CR_NUMBER=$(jq -r '.CR // empty' "$CR_FILE")
      if [ -z "$CR_NUMBER" ]; then
        echo "ERROR: $CR_FILE has no \"CR\" field. A CR number is required before merging."
        exit 1
      fi
      echo "✓ CR field present: $CR_NUMBER"

      # --- (d) Release must match target branch (unless target is main) ---
      if [ "$TARGET" != "main" ]; then
        RELEASE=$(jq -r '.Release // empty' "$CR_FILE")
        EXPECTED_BRANCH="Rel-${RELEASE}"
        if [ "$EXPECTED_BRANCH" != "$TARGET" ]; then
          echo "ERROR: Release field (Rel-${RELEASE}) does not match target branch (${TARGET})."
          exit 1
        fi
        echo "✓ Release matches target branch: $TARGET"
      else
        echo "✓ Target is main — skipping Release check"
      fi

      # --- (e) CRYYYY.json must not already exist ---
      CR_PADDED=$(printf "CR%04d" "$CR_NUMBER")
      FINAL_FILE="${HISTORY_DIR}/${CR_PADDED}.json"

      # Check on source branch (current working copy)
      if [ -f "$FINAL_FILE" ]; then
        echo "ERROR: $FINAL_FILE already exists on the source branch. CR number $CR_NUMBER is already used."
        exit 1
      fi

      # Check on target branch
      if git cat-file -e "origin/${TARGET}:${FINAL_FILE}" 2>/dev/null; then
        echo "ERROR: $FINAL_FILE already exists on the target branch (${TARGET}). CR number $CR_NUMBER is already used."
        exit 1
      fi
      echo "✓ ${CR_PADDED}.json does not exist on source or target branch"

      echo ""
      echo "=== All CR validation checks passed ==="
  rules:
    - if: $CI_PIPELINE_SOURCE == "merge_request_event" && $CI_MERGE_REQUEST_TARGET_BRANCH_NAME == "main"
    - if: $CI_PIPELINE_SOURCE == "merge_request_event" && $CI_MERGE_REQUEST_TARGET_BRANCH_NAME =~ /^Rel-\d+$/