name: 'Substreams Package Names'
description: 'Compute package names from changed files'

inputs:
  changed-files:
    description: 'List of changed files from tj-actions/changed-files'
    required: true

outputs:
  package_names:
    description: 'Space-separated list of package names that were found'
    value: ${{ steps.extract_package_names.outputs.package_names }}

runs:
  using: "composite"
  steps:
    - name: Get changed directories and package names
      id: extract_package_names
      shell: bash
      run: |
        # Convert space-separated list to newline-separated list and process
        echo '${{ inputs.changed-files }}' | tr ' ' '\n' | grep '^substreams/' | grep -v 'Cargo.lock$' > changed_files.txt
        
        # Initialize empty array for package names
        PACKAGE_NAMES=()
        
        # Process each changed file
        while IFS= read -r file; do
          # Get the directory of the file
          dir=$(dirname "$file")
          
          # Find the nearest parent directory containing Cargo.toml
          while [ "$dir" != "substreams" ] && [ "$dir" != "." ]; do
            if [ -f "$dir/Cargo.toml" ]; then
              PACKAGE_NAME=$(grep -m1 '^name = ' "$dir/Cargo.toml" | cut -d'"' -f2)
              if [ -n "$PACKAGE_NAME" ]; then
                PACKAGE_NAMES+=("$PACKAGE_NAME")
                break
              fi
            fi
            dir=$(dirname "$dir")
          done
        done < changed_files.txt
        
        # Remove duplicates and sort
        PACKAGE_NAMES=($(printf "%s\n" "${PACKAGE_NAMES[@]}" | sort -u))
        
        # Join package names with spaces and store
        if [ ${#PACKAGE_NAMES[@]} -gt 0 ]; then
          echo "package_names=${PACKAGE_NAMES[*]}" >> $GITHUB_OUTPUT
          echo "Found packages: ${PACKAGE_NAMES[*]}"
        else
          echo "No valid packages found"
          echo "package_names=" >> $GITHUB_OUTPUT
        fi