class Utils
  # accept market paramter and return the coinmarket cap quote for said market
  # @param [String]  market
  # @return [FalseClass and Float]
  def self.quote(market)
    case market
    when 'bchxrp'
      bchxrp_price
    when 'bchbtc'
      bchbtc_price
    when 'btcxrp'
      btcxrp_price
    when 'eoseth'
      eoseth_price
    when 'btcltc'
      btcltc_price
    when 'ltcbtc'
      ltcbtc_price
    when 'bchxrp'
      bchxrp_price
    when 'ltcbch'
      ltcbch_price
    when 'ltcxrp'
      ltcxrp_price
    else
      false
    end
  end

  # fetch ltc/xrp price from coin market cap
  # @return [float] rate
  def self.ltcxrp_price
    response = RestClient.get('https://api.coinmarketcap.com/v2/ticker/2/?convert=XRP')
    hash = JSON.parse(response.body)
    hash['data']['quotes']['XRP']['price'].to_f.round(4)
  end

  # fetch ltc/bch price from coin market cap
  # @return [float] rate
  def self.ltcbch_price
    response = RestClient.get('https://api.coinmarketcap.com/v2/ticker/2/?convert=BCH')
    hash = JSON.parse(response.body)
    hash['data']['quotes']['BCH']['price'].to_f.round(4)
  end

  # fetch bch/xrp price from coin market cap
  # @return [float] rate
  def self.bchxrp_price
    response = RestClient.get('https://api.coinmarketcap.com/v2/ticker/1831/?convert=XRP')
    hash = JSON.parse(response.body)
    hash['data']['quotes']['XRP']['price'].to_f.round(4)
  end

  # fetch ltc/btc price from coin market cap
  # @return [float] rate
  def self.ltcbtc_price
    response = RestClient.get('https://api.coinmarketcap.com/v2/ticker/2/?convert=BTC')
    hash = JSON.parse(response.body)
    hash['data']['quotes']['BTC']['price'].to_f.round(4)
  end

  # fetch btc/ltc price from coin market cap
  # @return [float] rate
  def self.btcltc_price
    response = RestClient.get('https://api.coinmarketcap.com/v2/ticker/1/?convert=LTC')
    hash = JSON.parse(response.body)
    hash['data']['quotes']['LTC']['price'].to_f.round(4)
  end

  # fetch bch/xrp price from coin market cap
  # @return [float] rate
  def self.bchxrp_price
    response = RestClient.get('https://api.coinmarketcap.com/v2/ticker/1831/?convert=XRP')
    hash = JSON.parse(response.body)
    hash['data']['quotes']['XRP']['price'].to_f.round(4)
  end

  # fetch bch/btc price from coin market cap
  # @return [float] rate
  def self.bchbtc_price
    response = RestClient.get('https://api.coinmarketcap.com/v2/ticker/1831/?convert=BTC')
    hash = JSON.parse (response.body)
    hash['data']['quotes']['BTC']['price'].to_f.round(4)
  end

  # fetch btc/xrp price from coin market cap
  # @return [float] rate
  def self.btcxrp_price
    response = RestClient.get('https://api.coinmarketcap.com/v2/ticker/1/?convert=XRP')
    hash = JSON.parse (response.body)
    hash['data']['quotes']['XRP']['price'].to_f.round(4)
  end

  # fetch eos/eth price from coin market cap
  # @return [float] rate
  def self.eoseth_price
    response = RestClient.get('https://api.coinmarketcap.com/v2/ticker/1765/?convert=ETH')
    hash = JSON.parse (response.body)
    return hash['data']['quotes']['ETH']['price'].to_f.round(4)
  end

  # Try and read the existing pid from the pid file and signal the
  # process. Returns true for a non blocking status.
  # @param [Integer]  pid
  # @return [FalseClass and TrueClass]
  def self.kill_process(pid)
    opid = File.read("#{pid}.pid").strip.to_i
    Process.kill "HUP", opid
    File.delete("#{pid}.pid")
    File.delete("#{pid}.outfile")
    File.delete("#{pid}.errfile")
    puts "Stopped process #{pid}"
    true
  rescue Errno::ENOENT
    $stdout.puts "#{pid} did not exist: Errno::ENOENT"
    true
  rescue Errno::ESRCH
    $stdout.puts "The process #{opid} did not exist: Errno::ESRCH"
    true
  rescue Errno::EPERM
    $stderr.puts "Lack of privileges to manage the process #{opid}: Errno::EPERM"
    false
  rescue ::Exception => e
    $stderr.puts "While signaling the PID, unexpected #{e.class}: #{e}"
    false
  end
end