require 'nokogiri'
require_relative 'core_ext.rb'

module Vamper
  class VersionConfigFile

    def self.get_default_file
      File.join(File.dirname(__FILE__), 'default.version.config')
    end

    def initialize(io, tags)
      doc = Nokogiri::XML(io)

      @file_types = []
      doc.xpath('/VersionConfig/FileType').each do |node|
        file_type_struct = Struct.new(:name, :file_specs, :updates, :write)
        search_replace_struct = Struct.new(:search, :replace)
        file_type = file_type_struct.new
        file_type.name = node.name
        file_type.file_specs = node.xpath('FileSpec').map { |sub_node|
          Regexp.new('^' + Regexp::escape(sub_node.text).gsub('\\*', '.*').gsub('\\?', '.') + '$')
        }
        update_node_set = node.xpath('Update')
        if update_node_set
          # Replace ${...} entries in the replace string with equivalent tags if available
          file_type.updates = update_node_set.map { |sub_node|
            s_and_r = search_replace_struct.new(
              %r(#{sub_node.at_xpath('Search').text.gsub(/\(\?'(\w+)'/, '(?<\\1>')}),
              sub_node.at_xpath('Replace').text.replace_tags(tags))
          }
        end
        write_node = node.at_xpath('Write')
        if write_node
          file_type.write = write_node.text.replace_tags(tags)
        end
        @file_types.push(file_type)
      end
    end

    attr_reader :file_types
  end
end