# Gemfile
gem "zugpferd"

require "zugpferd"

xml = File.read("invoice_ubl.xml")
invoice = Zugpferd::UBL::Reader.new.read(xml)

puts invoice.number          # BT-1
puts invoice.seller.name     # BG-4
puts invoice.type_code       # "380", "381", etc.

invoice.line_items.each do |line|
  puts "#{line.item.name}: #{line.line_extension_amount}"
end

xml = File.read("invoice_cii.xml")
invoice = Zugpferd::CII::Reader.new.read(xml)

invoice = Zugpferd::Model::Invoice.new(
  number: "INV-2024-001",
  issue_date: Date.today,
  type_code: "380",
  currency_code: "EUR",
)

invoice.seller = Zugpferd::Model::TradeParty.new(name: "Seller GmbH")
invoice.buyer  = Zugpferd::Model::TradeParty.new(name: "Buyer AG")

# ... set line items, tax, totals, payment ...

xml = Zugpferd::UBL::Writer.new.write(invoice)
File.write("output.xml", xml)

credit_note = Zugpferd::Model::CreditNote.new(
  number: "CN-2024-001",
  issue_date: Date.today,
)

# The writer automatically generates <CreditNote> instead of <Invoice>
xml = Zugpferd::UBL::Writer.new.write(credit_note)

# Read CII, write as UBL
invoice = Zugpferd::CII::Reader.new.read(cii_xml)
ubl_xml = Zugpferd::UBL::Writer.new.write(invoice)

require "zugpferd"
require "zugpferd/pdf"  # explicit opt-in

xml = Zugpferd::CII::Writer.new.write(invoice)

embedder = Zugpferd::PDF::Embedder.new
embedder.embed(
  pdf_path: "rechnung.pdf",
  xml: xml,
  output_path: "rechnung_zugferd.pdf",
  version: "2p1",
  conformance_level: "XRECHNUNG"  # use "EN 16931" for non-XRechnung invoices
)

require "zugpferd"
require "zugpferd/validation"  # explicit opt-in, requires Java + Saxon

xml = Zugpferd::CII::Writer.new.write(invoice)

validator = Zugpferd::Validation::SchematronValidator.new(schemas_path: "vendor/schemas")
errors = validator.validate(xml, rule_set: :xrechnung_cii)
fatals = errors.select { |e| e.flag == "fatal" }

if fatals.any?
  fatals.each { |e| puts "[#{e.id}] #{e.text}" }
end