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alex_bank.rb
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alex_bank.rb
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# frozen_string_literal: true
module EGPRates
# Bank of Alexandria
class AlexBank < EGPRates::Bank
def initialize
@sym = :AlexBank
@uri = URI.parse('https://www.alexbank.com/En/Home/ExchangeRates')
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
# ["", "US Dollar", "", ..., "17.10000", "", "17.50000", ""]
# ["", "British Pound", "", ..., "21.12363", "", "21.60025", ""]
# ...
#
def raw_exchange_rates
# AlexBank provide 17 currencies (and 1 <th>)
table_rows = Oga.parse_html(response.body).css('.exchangerate-table tr')
fail ResponseError, 'Unknown HTML' unless table_rows&.size == 18
table_rows.lazy.drop(1).map(&:children).map do |cell|
cell.map(&:text).map(&:strip)
end
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[9].to_f
buy_rate = row[7].to_f
currency = currency_symbol(row[1])
result[:sell][currency] = sell_rate
result[:buy][currency] = buy_rate
end
end
end
end