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midb.rb
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midb.rb
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# frozen_string_literal: true
module EGPRates
# Misr Iran Development Bank (MIDB)
class MIDB < EGPRates::Bank
def initialize
@sym = :MIDB
@uri = URI.parse('http://www.midb.com.eg/currency.aspx')
end
# @return [Hash] of exchange rates for selling and buying
# {
# { sell: { SYM: rate }, { SYM: rate }, ... },
# { buy: { SYM: rate }, { SYM: rate }, ... }
# }
def exchange_rates
@exchange_rates ||= parse(raw_exchange_rates)
end
private
# Send the request to the URL and retrun raw data of the response
# @return [Enumerator::Lazy] with the table row in HTML that evaluates to
# [
# [
# "\r\n\t", "USD", "17.5", "17.05", "17.5", "17.05", "\r\n\t\t"
# ], [
# "\r\n\t", "GBP", "21.6866", "21.0027", "21.6866", "21.0027", ...
# ]
# ...
# ]
def raw_exchange_rates
table_rows = Oga.parse_html(response.body)
.css('#MainContent_grdcurrency tr')
# MIDB porvide 7 currencies on the home page but with header
# and an empty row in the end
fail ResponseError, 'Unknown HTML' unless table_rows&.size == 8
table_rows.lazy.drop(1).map(&:children).map { |cell| cell.map(&:text) }
end
# Parse the #raw_exchange_rates returned in response
# @param [Array] of the raw_data scraped
# @return [Hash] of exchange rates for selling and buying
# {
# { sell: { SYM: rate }, { SYM: rate }, ... },
# { buy: { SYM: rate }, { SYM: rate }, ... }
# }
def parse(raw_data)
raw_data.each_with_object(sell: {}, buy: {}) do |row, result|
sell_rate = row[2].to_f
buy_rate = row[3].to_f
currency = row[1].to_sym
result[:sell][currency] = sell_rate
result[:buy][currency] = buy_rate
end
end
end
end