module MercadoBitcoin

# File lib/mercadobitcoin.rb, line 35
def authenticate!(credentials)
  credentials = credentials.with_indifferent_access

  @api_key = credentials[:api_key]
  @api_secret = credentials[:api_secret]
  @pin = credentials[:pin]
end

# File lib/mercadobitcoin.rb, line 12
def balance
  current_tonce = tonce

  method = "getInfo"
  headers = {
    "Content-type" => "application/x-www-form-urlencoded",
    "Key" => api_key,
    "Sign" => signature(method, current_tonce)
  }

  HTTParty.post(BASE_URL, {
    body: {
      method: method,
      tonce: current_tonce,
    },
    headers: headers
  })
end

# File lib/mercadobitcoin.rb, line 43
def signature(method, current_tonce)
  message = [method, pin, current_tonce].join(":")

  hash = HMAC::SHA512.hexdigest(api_secret, message)
end

# File lib/mercadobitcoin.rb, line 31
def tonce
  Time.now.to_i
end