package websocket

import (
	"fmt"
	"net"
	"net/url"

	ma "github.com/multiformats/go-multiaddr"
	manet "github.com/multiformats/go-multiaddr-net"
)

// Addr is an implementation of net.Addr for WebSocket.
type Addr struct {
	*url.URL
}

var _ net.Addr = (*Addr)(nil)

// Network returns the network type for a WebSocket, "websocket".
func (addr *Addr) Network() string {
	return "websocket"
}

// NewAddr creates a new Addr using the given host string
func NewAddr(host string) *Addr {
	return &Addr{
		URL: &url.URL{
			Host: host,
		},
	}
}

func ConvertWebsocketMultiaddrToNetAddr(maddr ma.Multiaddr) (net.Addr, error) {
	_, host, err := manet.DialArgs(maddr)
	if err != nil {
		return nil, err
	}

	return NewAddr(host), nil
}

func ParseWebsocketNetAddr(a net.Addr) (ma.Multiaddr, error) {
	wsa, ok := a.(*Addr)
	if !ok {
		return nil, fmt.Errorf("not a websocket address")
	}

	tcpaddr, err := net.ResolveTCPAddr("tcp", wsa.Host)
	if err != nil {
		return nil, err
	}

	tcpma, err := manet.FromNetAddr(tcpaddr)
	if err != nil {
		return nil, err
	}

	wsma, err := ma.NewMultiaddr("/ws")
	if err != nil {
		return nil, err
	}

	return tcpma.Encapsulate(wsma), nil
}

func parseMultiaddr(a ma.Multiaddr) (string, error) {
	_, host, err := manet.DialArgs(a)
	if err != nil {
		return "", err
	}

	return "ws://" + host, nil
}