gem 'adequate_crypto_address'

require 'adequate_crypto_address'
# BTC
AdequateCryptoAddress.valid?('12QeMLzSrB8XH8FvEzPMVoRxVAzTr5XM2y', 'BTC') #=> true
AdequateCryptoAddress.valid?('3NJZLcZEEYBpxYEUGewU4knsQRn1WM5Fkt', :bitcoin, :p2sh) #=> true

# BCH
AdequateCryptoAddress.valid?('bitcoincash:qrtj3rd8524cndt2eew3s6wljqggmne00sgh4kfypk', :bch) #=> true
AdequateCryptoAddress.valid?('mmRH4e9WW4ekZUP5HvBScfUyaSUjfQRyvD', :BCH, :p2pkhtest) #=> true

# ETH
AdequateCryptoAddress.valid?('0xde709f2102306220921060314715629080e2fb77', :ETH) #=> true
AdequateCryptoAddress.valid?('de709f2102306220921060314715629080e2fb77', :ethereum) #=> true

require 'adequate_crypto_address'

# BCH
AdequateCryptoAddress.address('mmRH4e9WW4ekZUP5HvBScfUyaSUjfQRyvD', 'bch').cash_address #=> "bchtest:qpqtmmfpw79thzq5z7s0spcd87uhn6d34uqqem83hf"
AdequateCryptoAddress.address('bitcoincash:qrtj3rd8524cndt2eew3s6wljqggmne00sgh4kfypk', 'bch').legacy_address #=> "1LcerwTc1oPsMtByDCNUXFxReZpN1EXHoe"

address_string = 'qrtj3rd8524cndt2eew3s6wljqggmne00sgh4kfypk'
addr = AdequateCryptoAddress.address(address_string, 'bch')
addr.prefix #=> "bitcoincash"
addr.type #=> :p2pkh
addr.address #=> "bitcoincash:qrtj3rd8524cndt2eew3s6wljqggmne00sgh4kfypk"

# ETH
AdequateCryptoAddress.address('D1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb', 'eth').address #=> "0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb"

class Model < ActiveRecord::Base
  attribute :address, :string
  attribute :dest_tag, :string
  attribute :currency, :string

  validate  :validate_address_type
  validate  :validate_destination_tag

  def validate_address_type
    errors.add(:address, 'invalid address') unless AdequateCryptoAddress.valid?(address, currency)
  end

  # for Ripple
  def validate_destination_tag
    errors.add(:dest_tag, 'invalid destination tag') if dest_tag.present? && !(dest_tag =~ /\A\d{1,10}\z/)
  end
end

# frozen_string_literal: true
# for Rails /config/initializers/adequate_crypto_address.rb
module AdequateCryptoAddress
  class Coin
    attr_reader :address

    def initialize(address_sring)
      @address = address_sring
    end

    def valid?(_type)
      address.present?
    end
  end
end

AdequateCryptoAddress.valid?('addr', :coin) #=> true