pivotal/LicenseFinder

# frozen_string_literal: true

require 'license_finder/package_utils/possible_license_file'

module LicenseFinder
  class LicenseFiles
    CANDIDATE_FILE_NAMES = %w[LICENSE License license LICENCE Licence licence COPYING copying README readme].freeze
    CANDIDATE_PATH_WILDCARD = "*{#{CANDIDATE_FILE_NAMES.join(',')}}*"

    def self.find(install_path, options = {})
      new(install_path).find(options)
    end

    def initialize(install_path)
      @install_path = install_path ? Pathname(install_path) : nil
    end

    def find(options = {})
      paths_of_candidate_files
        .map { |path| PossibleLicenseFile.new(path, options) }
        .reject { |file| file.license.nil? }
    end

    private

    attr_reader :install_path

    def paths_of_candidate_files
      candidate_files_and_dirs
        .flat_map { |path| !path.is_a?(Zip::Entry) && path.directory? ? path.children : path }
        .reject(&:directory?)
        .uniq
    end

    def candidate_files_and_dirs
      return [] if install_path.nil?

      if !install_path.extname.casecmp('.jar').zero?
        Pathname.glob(install_path.join('**', CANDIDATE_PATH_WILDCARD))
      else
        candidates_from_zip
      end
    end

    def candidates_from_zip
      Zip::File.open(install_path.to_s) do |zip_file|
        zip_file.glob(CANDIDATE_PATH_WILDCARD, File::FNM_EXTGLOB)
      end
    end
  end
end