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_region_codes(file)

      # File region_codes.csv
      # Format:
      # countrycode,region,regionname

      # what this does is replace the contents of the table with the new data.

      self.transaction do
        self.connection.execute "delete from #{self.table_name}"

        File.open(file, 'r:ISO-8859-1') do |io|
          saved_level = ActiveRecord::Base.logger ? ActiveRecord::Base.logger.level : -1
          count = 0
          errors = 0
          ncols = 3

          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

            countrycode = row[0]
            region = row[1]
            regionname = row[2]

            if countrycode.length == 2 and region.length == 2 and regionname.length >= 2 and regionname.length <= 64

              stmt = "INSERT INTO #{self.table_name} (countrycode, region, regionname) VALUES (#{self.connection.quote(countrycode)}, #{self.connection.quote(region)}, #{self.connection.quote(regionname)})"
              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
            else
              ActiveRecord::Base.logger.warn("bogus region_codes record '#{countrycode}', '#{region}', '#{regionname}'") if ActiveRecord::Base.logger
              errors += 1
            end
          end

          if ActiveRecord::Base.logger
            ActiveRecord::Base.logger.level = saved_level
            ActiveRecord::Base.logger.debug "inserted #{count} records into #{self.table_name}, #{errors} errors"
          end
        end # file
      end # transaction
    end
  end
end