module Coinmarketcap

# File lib/coinmarketcap.rb, line 15
def self.coin(id, currency = 'USD')
  HTTParty.get("https://api.coinmarketcap.com/v2/ticker/#{id}/?convert=#{currency}")
end

# File lib/coinmarketcap.rb, line 7
def self.coins(limit = nil)
  if limit.nil?
    HTTParty.get('https://api.coinmarketcap.com/v2/ticker/?structure=array')
  else
    HTTParty.get("https://api.coinmarketcap.com/v2/ticker/?limit=#{limit}&structure=array")
  end
end

# File lib/coinmarketcap.rb, line 23
def self.get_historical_price(id, start_date, end_date) # 20170908
  prices = []
  doc = Nokogiri::HTML(open("https://coinmarketcap.com/currencies/#{id}/historical-data/?start=#{start_date}&end=#{end_date}"))
  rows = doc.css('tr')
  rows.shift
  rows.each do |row|
    begin
      each_row = Nokogiri::HTML(row.to_s).css('td')
      if each_row.count > 1
        price_bundle = {}
        price_bundle[:date] = Date.parse(each_row[0].text)
        price_bundle[:open] = each_row[1].text.to_f
        price_bundle[:high] = each_row[2].text.to_f
        price_bundle[:low] = each_row[3].text.to_f
        price_bundle[:close] = each_row[4].text.to_f
        price_bundle[:avg] = (price_bundle[:high] + price_bundle[:low]) / 2.0
        prices << price_bundle
      end
    rescue
      next
    end
  end
  prices
end

# File lib/coinmarketcap.rb, line 19
def self.global(currency = 'USD')
  HTTParty.get("https://api.coinmarketcap.com/v2/global/?convert=#{currency}")
end