package qerr

import (
	"errors"
	"fmt"
	"net"

	"github.com/refraction-networking/uquic/internal/protocol"

	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
)

type myError int

var _ error = myError(0)

func (e myError) Error() string { return fmt.Sprintf("my error %d", e) }

var _ = Describe("QUIC Errors", func() {
	Context("Transport Errors", func() {
		It("has a string representation", func() {
			Expect((&TransportError{
				ErrorCode:    FlowControlError,
				ErrorMessage: "foobar",
			}).Error()).To(Equal("FLOW_CONTROL_ERROR (local): foobar"))
		})

		It("has a string representation for empty error phrases", func() {
			Expect((&TransportError{ErrorCode: FlowControlError}).Error()).To(Equal("FLOW_CONTROL_ERROR (local)"))
		})

		It("includes the frame type, for errors without a message", func() {
			Expect((&TransportError{
				Remote:    true,
				ErrorCode: FlowControlError,
				FrameType: 0x1337,
			}).Error()).To(Equal("FLOW_CONTROL_ERROR (remote) (frame type: 0x1337)"))
		})

		It("includes the frame type, for errors with a message", func() {
			Expect((&TransportError{
				ErrorCode:    FlowControlError,
				FrameType:    0x1337,
				ErrorMessage: "foobar",
			}).Error()).To(Equal("FLOW_CONTROL_ERROR (local) (frame type: 0x1337): foobar"))
		})

		Context("crypto errors", func() {
			It("has a string representation for errors with a message", func() {
				myErr := myError(1337)
				err := NewLocalCryptoError(0x42, myErr)
				Expect(err.Error()).To(Equal("CRYPTO_ERROR 0x142 (local): my error 1337"))
			})

			It("unwraps errors", func() {
				var myErr myError
				err := NewLocalCryptoError(0x42, myError(1337))
				Expect(errors.As(err, &myErr)).To(BeTrue())
				Expect(myErr).To(BeEquivalentTo(1337))
			})

			It("has a string representation for errors without a message", func() {
				err := NewLocalCryptoError(0x2a, nil)
				Expect(err.Error()).To(Equal("CRYPTO_ERROR 0x12a (local): tls: bad certificate"))
			})
		})
	})

	Context("Application Errors", func() {
		It("has a string representation for errors with a message", func() {
			Expect((&ApplicationError{
				ErrorCode:    0x42,
				ErrorMessage: "foobar",
			}).Error()).To(Equal("Application error 0x42 (local): foobar"))
		})

		It("has a string representation for errors without a message", func() {
			Expect((&ApplicationError{
				ErrorCode: 0x42,
				Remote:    true,
			}).Error()).To(Equal("Application error 0x42 (remote)"))
		})
	})

	Context("timeout errors", func() {
		It("handshake timeouts", func() {
			//nolint:gosimple // we need to assign to an interface here
			var err error
			err = &HandshakeTimeoutError{}
			nerr, ok := err.(net.Error)
			Expect(ok).To(BeTrue())
			Expect(nerr.Timeout()).To(BeTrue())
			Expect(err.Error()).To(Equal("timeout: handshake did not complete in time"))
		})

		It("idle timeouts", func() {
			//nolint:gosimple // we need to assign to an interface here
			var err error
			err = &IdleTimeoutError{}
			nerr, ok := err.(net.Error)
			Expect(ok).To(BeTrue())
			Expect(nerr.Timeout()).To(BeTrue())
			Expect(err.Error()).To(Equal("timeout: no recent network activity"))
		})
	})

	Context("Version Negotiation errors", func() {
		It("has a string representation", func() {
			Expect((&VersionNegotiationError{
				Ours:   []protocol.VersionNumber{2, 3},
				Theirs: []protocol.VersionNumber{4, 5, 6},
			}).Error()).To(Equal("no compatible QUIC version found (we support [0x2 0x3], server offered [0x4 0x5 0x6])"))
		})
	})

	Context("Stateless Reset errors", func() {
		token := protocol.StatelessResetToken{0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf}

		It("has a string representation", func() {
			Expect((&StatelessResetError{Token: token}).Error()).To(Equal("received a stateless reset with token 000102030405060708090a0b0c0d0e0f"))
		})

		It("is a net.Error", func() {
			//nolint:gosimple // we need to assign to an interface here
			var err error
			err = &StatelessResetError{}
			nerr, ok := err.(net.Error)
			Expect(ok).To(BeTrue())
			Expect(nerr.Timeout()).To(BeFalse())
		})
	})

	It("says that errors are net.ErrClosed errors", func() {
		Expect(errors.Is(&TransportError{}, net.ErrClosed)).To(BeTrue())
		Expect(errors.Is(&ApplicationError{}, net.ErrClosed)).To(BeTrue())
		Expect(errors.Is(&IdleTimeoutError{}, net.ErrClosed)).To(BeTrue())
		Expect(errors.Is(&HandshakeTimeoutError{}, net.ErrClosed)).To(BeTrue())
		Expect(errors.Is(&StatelessResetError{}, net.ErrClosed)).To(BeTrue())
		Expect(errors.Is(&VersionNegotiationError{}, net.ErrClosed)).To(BeTrue())
	})
})