// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package net

import (
	"context"
	"internal/itoa"
	"syscall"
)

// BUG(mikio): On Plan 9, the ReadMsgUDP and
// WriteMsgUDP methods of UDPConn are not implemented.

// BUG(mikio): On Windows, the File method of UDPConn is not
// implemented.

// BUG(mikio): On JS, methods and functions related to UDPConn are not
// implemented.

// UDPAddr represents the address of a UDP end point.
type UDPAddr struct {
	IP   IP
	Port int
	Zone string // IPv6 scoped addressing zone
}

// Network returns the address's network name, "udp".
func (a *UDPAddr) Network() string { return "udp" }

func (a *UDPAddr) String() string {
	if a == nil {
		return "<nil>"
	}
	ip := ipEmptyString(a.IP)
	if a.Zone != "" {
		return JoinHostPort(ip+"%"+a.Zone, itoa.Itoa(a.Port))
	}
	return JoinHostPort(ip, itoa.Itoa(a.Port))
}

func (a *UDPAddr) isWildcard() bool {
	if a == nil || a.IP == nil {
		return true
	}
	return a.IP.IsUnspecified()
}

func (a *UDPAddr) opAddr() Addr {
	if a == nil {
		return nil
	}
	return a
}

// ResolveUDPAddr returns an address of UDP end point.
//
// The network must be a UDP network name.
//
// If the host in the address parameter is not a literal IP address or
// the port is not a literal port number, ResolveUDPAddr resolves the
// address to an address of UDP end point.
// Otherwise, it parses the address as a pair of literal IP address
// and port number.
// The address parameter can use a host name, but this is not
// recommended, because it will return at most one of the host name's
// IP addresses.
//
// See func Dial for a description of the network and address
// parameters.
func ResolveUDPAddr(network, address string) (*UDPAddr, error) {
	switch network {
	case "udp", "udp4", "udp6":
	case "": // a hint wildcard for Go 1.0 undocumented behavior
		network = "udp"
	default:
		return nil, UnknownNetworkError(network)
	}
	addrs, err := DefaultResolver.internetAddrList(context.Background(), network, address)
	if err != nil {
		return nil, err
	}
	return addrs.forResolve(network, address).(*UDPAddr), nil
}

// UDPConn is the implementation of the Conn and PacketConn interfaces
// for UDP network connections.
type UDPConn struct {
	conn
}

// SyscallConn returns a raw network connection.
// This implements the syscall.Conn interface.
func (c *UDPConn) SyscallConn() (syscall.RawConn, error) {
	if !c.ok() {
		return nil, syscall.EINVAL
	}
	return newRawConn(c.fd)
}

// ReadFromUDP acts like ReadFrom but returns a UDPAddr.
func (c *UDPConn) ReadFromUDP(b []byte) (n int, addr *UDPAddr, err error) {
	// This function is designed to allow the caller to control the lifetime
	// of the returned *UDPAddr and thereby prevent an allocation.
	// See https://blog.filippo.io/efficient-go-apis-with-the-inliner/.
	// The real work is done by readFromUDP, below.
	return c.readFromUDP(b, &UDPAddr{})
}

// readFromUDP implements ReadFromUDP.
func (c *UDPConn) readFromUDP(b []byte, addr *UDPAddr) (int, *UDPAddr, error) {
	if !c.ok() {
		return 0, nil, syscall.EINVAL
	}
	n, addr, err := c.readFrom(b, addr)
	if err != nil {
		err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
	}
	return n, addr, err
}

// ReadFrom implements the PacketConn ReadFrom method.
func (c *UDPConn) ReadFrom(b []byte) (int, Addr, error) {
	n, addr, err := c.readFromUDP(b, &UDPAddr{})
	if addr == nil {
		// Return Addr(nil), not Addr(*UDPConn(nil)).
		return n, nil, err
	}
	return n, addr, err
}

// ReadMsgUDP reads a message from c, copying the payload into b and
// the associated out-of-band data into oob. It returns the number of
// bytes copied into b, the number of bytes copied into oob, the flags
// that were set on the message and the source address of the message.
//
// The packages golang.org/x/net/ipv4 and golang.org/x/net/ipv6 can be
// used to manipulate IP-level socket options in oob.
func (c *UDPConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *UDPAddr, err error) {
	if !c.ok() {
		return 0, 0, 0, nil, syscall.EINVAL
	}
	n, oobn, flags, addr, err = c.readMsg(b, oob)
	if err != nil {
		err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
	}
	return
}

// WriteToUDP acts like WriteTo but takes a UDPAddr.
func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error) {
	if !c.ok() {
		return 0, syscall.EINVAL
	}
	n, err := c.writeTo(b, addr)
	if err != nil {
		err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
	}
	return n, err
}

// WriteTo implements the PacketConn WriteTo method.
func (c *UDPConn) WriteTo(b []byte, addr Addr) (int, error) {
	if !c.ok() {
		return 0, syscall.EINVAL
	}
	a, ok := addr.(*UDPAddr)
	if !ok {
		return 0, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr, Err: syscall.EINVAL}
	}
	n, err := c.writeTo(b, a)
	if err != nil {
		err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: a.opAddr(), Err: err}
	}
	return n, err
}

// WriteMsgUDP writes a message to addr via c if c isn't connected, or
// to c's remote address if c is connected (in which case addr must be
// nil). The payload is copied from b and the associated out-of-band
// data is copied from oob. It returns the number of payload and
// out-of-band bytes written.
//
// The packages golang.org/x/net/ipv4 and golang.org/x/net/ipv6 can be
// used to manipulate IP-level socket options in oob.
func (c *UDPConn) WriteMsgUDP(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
	if !c.ok() {
		return 0, 0, syscall.EINVAL
	}
	n, oobn, err = c.writeMsg(b, oob, addr)
	if err != nil {
		err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
	}
	return
}

func newUDPConn(fd *netFD) *UDPConn { return &UDPConn{conn{fd}} }

// DialUDP acts like Dial for UDP networks.
//
// The network must be a UDP network name; see func Dial for details.
//
// If laddr is nil, a local address is automatically chosen.
// If the IP field of raddr is nil or an unspecified IP address, the
// local system is assumed.
func DialUDP(network string, laddr, raddr *UDPAddr) (*UDPConn, error) {
	switch network {
	case "udp", "udp4", "udp6":
	default:
		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: UnknownNetworkError(network)}
	}
	if raddr == nil {
		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: nil, Err: errMissingAddress}
	}
	sd := &sysDialer{network: network, address: raddr.String()}
	c, err := sd.dialUDP(context.Background(), laddr, raddr)
	if err != nil {
		return nil, &OpError{Op: "dial", Net: network, Source: laddr.opAddr(), Addr: raddr.opAddr(), Err: err}
	}
	return c, nil
}

// ListenUDP acts like ListenPacket for UDP networks.
//
// The network must be a UDP network name; see func Dial for details.
//
// If the IP field of laddr is nil or an unspecified IP address,
// ListenUDP listens on all available IP addresses of the local system
// except multicast IP addresses.
// If the Port field of laddr is 0, a port number is automatically
// chosen.
func ListenUDP(network string, laddr *UDPAddr) (*UDPConn, error) {
	switch network {
	case "udp", "udp4", "udp6":
	default:
		return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: UnknownNetworkError(network)}
	}
	if laddr == nil {
		laddr = &UDPAddr{}
	}
	sl := &sysListener{network: network, address: laddr.String()}
	c, err := sl.listenUDP(context.Background(), laddr)
	if err != nil {
		return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: laddr.opAddr(), Err: err}
	}
	return c, nil
}

// ListenMulticastUDP acts like ListenPacket for UDP networks but
// takes a group address on a specific network interface.
//
// The network must be a UDP network name; see func Dial for details.
//
// ListenMulticastUDP listens on all available IP addresses of the
// local system including the group, multicast IP address.
// If ifi is nil, ListenMulticastUDP uses the system-assigned
// multicast interface, although this is not recommended because the
// assignment depends on platforms and sometimes it might require
// routing configuration.
// If the Port field of gaddr is 0, a port number is automatically
// chosen.
//
// ListenMulticastUDP is just for convenience of simple, small
// applications. There are golang.org/x/net/ipv4 and
// golang.org/x/net/ipv6 packages for general purpose uses.
//
// Note that ListenMulticastUDP will set the IP_MULTICAST_LOOP socket option
// to 0 under IPPROTO_IP, to disable loopback of multicast packets.
func ListenMulticastUDP(network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
	switch network {
	case "udp", "udp4", "udp6":
	default:
		return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: UnknownNetworkError(network)}
	}
	if gaddr == nil || gaddr.IP == nil {
		return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: errMissingAddress}
	}
	sl := &sysListener{network: network, address: gaddr.String()}
	c, err := sl.listenMulticastUDP(context.Background(), ifi, gaddr)
	if err != nil {
		return nil, &OpError{Op: "listen", Net: network, Source: nil, Addr: gaddr.opAddr(), Err: err}
	}
	return c, nil
}