Fetch API bank

# frozen_string_literal: true

require 'date'
require 'nokogiri'
require 'net/http'
require 'ostruct'
require 'awesome_print'
require 'json'

class CurrencyService
  CENTRAL_BANK_URL = 'https://si3.bcentral.cl/bdemovil/BDE/IndicadoresDiarios?fecha='
  API_ENDPOINT = 'http://apilayer.net/api/historical?currencies=CLP&date='
  API_KEY = '3b2c596b9e0c3b60ca33663ed9350614'
  attr_accessor :last_response, :response, :fetch_method


  def values(from_date, to_date)
    output = {}
    self.last_response = nil
    (from_date..to_date).each do |date|
      self.response = fetch_central_bank(date)
      output[date.strftime('%Y-%m-%d')] = { uf: parse_currency('uf'), usd: parse_currency('usd') }
      self.last_response = response
    end
    output
  end

  def parse_currency(currency_type)
    { today: response.send(currency_type), diff: (!last_response.nil? ? last_response.send(currency_type) - response.send(currency_type) : nil) }
  end

  def fetch_from_api(date)
    parsed_date = date.strftime('%Y-%m-%d')
    date_uri = URI("#{API_ENDPOINT}#{parsed_date}&access_key=#{API_KEY}")
    json = JSON.parse(Net::HTTP.get_response(date_uri).body)
    ap json
    OpenStruct.new(uf: 0, usd: json['quotes']['USDCLP'], date: date.strftime('%Y-%m-%d'))
  end

  def fetch_central_bank(date)
    parsed_date = date.strftime('%d-%m-%Y')
    date_uri = URI("#{CENTRAL_BANK_URL}#{parsed_date}")
    html_doc = Nokogiri::HTML(Net::HTTP.get_response(date_uri).body)
    uf = cleanse_currency_value(html_doc.css('table.tableUnits td')[1].content)
    usd = cleanse_currency_value(html_doc.css('table.tableUnits')[1].css('td')[1].content)
    OpenStruct.new(uf: uf, usd: usd, date: date.strftime('%Y-%m-%d'))
  end

  def cleanse_currency_value(value)
    value.to_s.gsub('.', '').gsub(',', '.').to_f
  end
end

currency_service = CurrencyService.new
ap currency_service.values(Date.new(2019, 1, 31), Date.new(2019, 2, 1))