name: 'Has Engine Changes'
description: 'Checks if there are any engine changes in the current branch'
outputs:
  changed:
    description: "Returns 'true' if there are engine changes, 'false' otherwise"
    value: ${{ steps.check.outputs.changed }}
runs:
  using: "composite"
  steps:
    - name: Check Engine Changes
      id: check
      shell: bash
      env:
        EVENT_NAME: ${{ github.event_name }}
        PR_BASE_SHA: ${{ github.event.pull_request.base.sha }}
        MERGE_GROUP_BASE_SHA: ${{ github.event.merge_group.base_sha }}
        PUSH_BEFORE_SHA: ${{ github.event.before }}
      run: |
        EMPTY_SHA="0000000000000000000000000000000000000000"
        if [ "$EVENT_NAME" = "pull_request" ]; then
          BASE_REF="$PR_BASE_SHA"
        elif [ "$EVENT_NAME" = "merge_group" ]; then
          BASE_REF="$MERGE_GROUP_BASE_SHA"
        elif [ "$EVENT_NAME" = "push" ] && [ -n "$PUSH_BEFORE_SHA" ] && [ "$PUSH_BEFORE_SHA" != "$EMPTY_SHA" ]; then
          BASE_REF="$PUSH_BEFORE_SHA"
        else
          if git show-ref --verify --quiet refs/remotes/upstream/master; then
            BASE_REF="upstream/master"
          else
            BASE_REF="origin/master"
          fi
        fi

        echo "Comparing against base SHA: $BASE_REF"

        CHANGED_FILES=$(.github/scripts/git_files_changed.sh "$BASE_REF")
        echo "Changed files in this branch:"
        echo "$CHANGED_FILES"

        if [ "$(printf '%s\n' "$CHANGED_FILES" | .github/scripts/did_engine_change.sh)" = "true" ]; then
          echo "Engine files changed."
          echo "changed=true" >> "$GITHUB_OUTPUT"
        else
          echo "No engine files changed."
          echo "changed=false" >> "$GITHUB_OUTPUT"
        fi