module JamRuby
  class Region < ActiveRecord::Base

    self.table_name = 'regions'

    def self.get_all(country)
      self.where(countrycode: country).order('regionname asc').all
    end

    def self.import_from_xx_region(countrycode, file)

      # File xx_region.csv
      # Format:
      # region,regionname

      # what this does is not replace the contents of the table, but rather update the specifies rows with the names.
      # any rows not specified are left alone. the parameter countrycode denote the country of the region (when uppercased)

      raise "countrycode (#{MaxMindIsp.quote_value(countrycode)}) is missing or invalid (it must be two characters)" unless countrycode and countrycode.length == 2
      countrycode = countrycode.upcase

      self.transaction do
        self.connection.execute "update #{self.table_name} set regionname = region where countrycode = #{MaxMindIsp.quote_value(countrycode)}"

        File.open(file, 'r:ISO-8859-1') do |io|
          saved_level = ActiveRecord::Base.logger ? ActiveRecord::Base.logger.level : 0
          count = 0

          ncols = 2

          csv = ::CSV.new(io, {encoding: 'ISO-8859-1', headers: false})
          csv.each do |row|
            raise "file does not have expected number of columns (#{ncols}): #{row.length}" unless row.length == ncols

            region = row[0]
            regionname = row[1]

            stmt = "UPDATE #{self.table_name} SET regionname = #{MaxMindIsp.quote_value(regionname)} WHERE countrycode = #{MaxMindIsp.quote_value(countrycode)} AND region = #{MaxMindIsp.quote_value(region)}"
            self.connection.execute stmt
            count += 1

            if ActiveRecord::Base.logger and ActiveRecord::Base.logger.level < Logger::INFO
              ActiveRecord::Base.logger.debug "... logging updates to #{self.table_name} suspended ..."
              ActiveRecord::Base.logger.level = Logger::INFO
            end
          end

          if ActiveRecord::Base.logger
            ActiveRecord::Base.logger.level = saved_level
            ActiveRecord::Base.logger.debug "updated #{count} records in #{self.table_name}"
          end
        end # file
      end # transaction
    end
  end
end