package quic

import (
	capnp "zombiezen.com/go/capnproto2"
	"zombiezen.com/go/capnproto2/pogs"

	"github.com/cloudflare/cloudflared/quic/schema"
)

// ConnectionType indicates the type of underlying connection proxied within the QUIC stream.
type ConnectionType uint16

const (
	ConnectionTypeHTTP ConnectionType = iota
	ConnectionTypeWebsocket
	ConnectionTypeTCP
)

// ConnectRequest is the representation of metadata sent at the start of a QUIC application handshake.
type ConnectRequest struct {
	Dest     string         `capnp:"dest"`
	Type     ConnectionType `capnp:"type"`
	Metadata []Metadata     `capnp:"metadata"`
}

// Metadata is a representation of key value based data sent via RequestMeta.
type Metadata struct {
	Key string `capnp:"key"`
	Val string `capnp:"val"`
}

func (r *ConnectRequest) fromPogs(msg *capnp.Message) error {
	metadata, err := schema.ReadRootConnectRequest(msg)
	if err != nil {
		return err
	}
	return pogs.Extract(r, schema.ConnectRequest_TypeID, metadata.Struct)
}

func (r *ConnectRequest) toPogs() (*capnp.Message, error) {
	msg, seg, err := capnp.NewMessage(capnp.SingleSegment(nil))
	if err != nil {
		return nil, err
	}

	root, err := schema.NewRootConnectRequest(seg)
	if err != nil {
		return nil, err
	}

	if err := pogs.Insert(schema.ConnectRequest_TypeID, root.Struct, r); err != nil {
		return nil, err
	}

	return msg, nil
}

// ConnectResponse is a representation of metadata sent as a response to a QUIC application handshake.
type ConnectResponse struct {
	Error    string     `capnp:"error"`
	Metadata []Metadata `capnp:"metadata"`
}

func (r *ConnectResponse) fromPogs(msg *capnp.Message) error {
	metadata, err := schema.ReadRootConnectResponse(msg)
	if err != nil {
		return err
	}
	return pogs.Extract(r, schema.ConnectResponse_TypeID, metadata.Struct)
}

func (r *ConnectResponse) toPogs() (*capnp.Message, error) {
	msg, seg, err := capnp.NewMessage(capnp.SingleSegment(nil))
	if err != nil {
		return nil, err
	}

	root, err := schema.NewRootConnectResponse(seg)
	if err != nil {
		return nil, err
	}

	if err := pogs.Insert(schema.ConnectResponse_TypeID, root.Struct, r); err != nil {
		return nil, err
	}

	return msg, nil
}