package libwallet

import (
	"github.com/lightningnetwork/lnd/lnwire"
	"github.com/muun/libwallet/lnurl"
)

type LNURLEvent struct {
	Code     int
	Message  string
	Metadata *LNURLEventMetadata
}

type LNURLEventMetadata struct {
	Host      string
	Invoice   string
	RequestId string
}

const (
	LNURLErrDecode             = lnurl.ErrDecode
	LNURLErrUnsafeURL          = lnurl.ErrUnsafeURL
	LNURLErrUnreachable        = lnurl.ErrUnreachable
	LNURLErrInvalidResponse    = lnurl.ErrInvalidResponse
	LNURLErrResponse           = lnurl.ErrResponse
	LNURLErrUnknown            = lnurl.ErrUnknown
	LNURLErrWrongTag           = lnurl.ErrWrongTag
	LNURLErrNoAvailableBalance = lnurl.ErrNoAvailableBalance
	LNURLErrRequestExpired     = lnurl.ErrRequestExpired
	LNURLErrNoRoute            = lnurl.ErrNoRoute
	LNURLErrTorNotSupported    = lnurl.ErrTorNotSupported
	LNURLErrAlreadyUsed        = lnurl.ErrAlreadyUsed
	LNURLErrForbidden          = lnurl.ErrForbidden
	LNURLStatusContacting      = lnurl.StatusContacting
	LNURLStatusInvoiceCreated  = lnurl.StatusInvoiceCreated
	LNURLStatusReceiving       = lnurl.StatusReceiving
)

type LNURLListener interface {
	OnUpdate(e *LNURLEvent)
	OnError(e *LNURLEvent)
}

func LNURLValidate(qr string) bool {
	return lnurl.Validate(qr)
}

// Withdraw will parse an LNURL withdraw QR and begin a withdraw process.
// Caller must wait for the actual payment after this function has notified success.
func LNURLWithdraw(net *Network, userKey *HDPrivateKey, routeHints *RouteHints, qr string, listener LNURLListener) {
	// TODO: consider making a struct out of the (net, userKey, routeHints) data
	// that can be used for creating invoices
	createInvoiceFunc := func(amt lnwire.MilliSatoshi, desc string, host string) (string, error) {
		opts := &InvoiceOptions{
			AmountMSat:  int64(amt),
			Description: desc,
			Metadata: &OperationMetadata{
				LnurlSender: host,
			},
		}
		return CreateInvoice(net, userKey, routeHints, opts)
	}

	allowUnsafe := net != Mainnet()

	go lnurl.Withdraw(qr, createInvoiceFunc, allowUnsafe, func(e *lnurl.Event) {
		event := &LNURLEvent{
			Code:    e.Code,
			Message: e.Message,
			Metadata: &LNURLEventMetadata{
				Host:      e.Metadata.Host,
				Invoice:   e.Metadata.Invoice,
				RequestId: e.Metadata.RequestId,
			},
		}
		if event.Code < 100 {
			listener.OnError(event)
		} else {
			listener.OnUpdate(event)
		}
	})
}