net.codinux.kotlin.android.AndroidContext.applicationContext = this.applicationContext

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        net.codinux.invoicing.platform.AndroidContext.applicationContext = this.applicationContext
        // ...
    }
}

val reader = EInvoiceReader()

// extract invoice data from a ZUGFeRD or Factor-X PDF that contains eInvoice XML as attachment
val invoiceFromPDF = reader.extractFromPdf(File("ZUGFeRD.pdf"))

// extract eInvoice data from a XML file like XRechnung:
val invoiceFromXml = reader.extractFromXml(File("XRechnung.xml"))

val emailsFetcher = EmailsFetcher()

val fetchResult = emailsFetcher.fetchAllEmails(EmailAccount(
    username = "", // your email account username
    password = "", // your email account username
    serverAddress = "", // IMAP server address
    port = null // IMAP server port, can be left null for default port 993
))

fetchResult.emails.forEach { email ->
    println("${email.sender}: ${email.attachments.firstNotNullOfOrNull { it.invoice }?.totals?.duePayableAmount}")
}

val validator = EInvoiceValidator()
val invoiceFile = File("ZUGFeRD.pdf") // or XRechnung,xml, ...

val result = validator.validate(invoiceFile)

println("Is valid? ${result.isValid}")
println(result.reportAsXml)

fun create() {
    val invoice = createInvoice()
    val pdfResultFile = File.createTempFile("Zugferd", ".pdf")

    // create a PDF that also contains the eInvoice as XML attachment
    val pdfCreator = JvmEInvoicePdfCreator()
    pdfCreator.createPdfWithAttachedXml(invoice, pdfResultFile)

    val xmlCreator = EInvoiceXmlCreator()

    // create only the XML file
    val xml = xmlCreator.createFacturXXml(invoice)

    // create a XRechnung
    val xRechnung = xmlCreator.createXRechnungXml(invoice)
}

private fun createInvoice() = Invoice(
    details = InvoiceDetails("RE-00001", LocalDate.now()),
    supplier = Party("codinux GmbH & Co. KG", "Fun Street 1", null, "12345", "Glückstadt"),
    customer = Party("Abzock GmbH", "Ausbeutstr.", null, "12345", "Abzockhausen"),
    items = listOf(InvoiceItem("Erbrachte Dienstleistungen", BigDecimal(170), "HUR", BigDecimal(105), BigDecimal(19))) // HUR = EN code for hour
)

val invoice: Invoice = createInvoice()
val existingPdf = File("Invoice.pdf")
val output = File("Zugferd.pdf")

val attacher = EInvoiceXmlToPdfAttacher()
attacher.attachInvoiceXmlToPdf(invoice, existingPdf, output)

// or if you already have the invoice XML:
val xmlCreator = EInvoiceXmlCreator()
val invoiceXml = xmlCreator.createXRechnungXml(invoice) // or creator.createZugferdXml(invoice), ...

attacher.attachInvoiceXmlToPdf(invoiceXml, EInvoiceXmlFormat.XRechnung, existingPdf, output)