name: Lint subtrees.json

on:
  pull_request:
    paths:
      - '.github/subtrees.json'

  workflow_call:
  workflow_dispatch:

jobs:
  lint-subtrees:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout PR code
        uses: actions/checkout@v4

      - name: Validate subtrees.json
        run: |
          set -e

          FILE=".github/subtrees.json"

          echo "Validating $FILE..."

          # Ensure it's valid JSON
          jq empty "$FILE"

          # Check required structure
          missing=$(jq 'to_entries | map(select(.value.prefix == null or .value.url == null)) | length' "$FILE")
          if [ "$missing" -ne 0 ]; then
            echo "❌ Some subtree entries are missing 'prefix' or 'url'"
            jq 'to_entries | map(select(.value.prefix == null or .value.url == null))' "$FILE"
            exit 1
          fi

          # Optional: check for bad URLs
          bad_urls=$(jq -r 'to_entries[] | select(.value.url | test("https://.+\\.git$") | not) | .key' "$FILE")
          if [ -n "$bad_urls" ]; then
            echo "❌ Invalid URLs found for the following subtrees:"
            echo "$bad_urls"
            exit 1
          fi

          echo "✅ subtrees.json looks good!"