// Copyright 2012 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.

// This file implements API tests across platforms and should never have a build
// constraint.

package net

import (
	"os"
	"testing"
)

// The full stack test cases for IPConn have been moved to the
// following:
//	golang.org/x/net/ipv4
//	golang.org/x/net/ipv6
//	golang.org/x/net/icmp

func packetConnTestData(t *testing.T, network string) ([]byte, func()) {
	if !testableNetwork(network) {
		return nil, func() { t.Logf("skipping %s test", network) }
	}
	return []byte("PACKETCONN TEST"), nil
}

func TestPacketConn(t *testing.T) {
	var packetConnTests = []struct {
		net   string
		addr1 string
		addr2 string
	}{
		{"udp", "127.0.0.1:0", "127.0.0.1:0"},
		{"unixgram", testUnixAddr(t), testUnixAddr(t)},
	}

	closer := func(c PacketConn, net, addr1, addr2 string) {
		c.Close()
		switch net {
		case "unixgram":
			os.Remove(addr1)
			os.Remove(addr2)
		}
	}

	for _, tt := range packetConnTests {
		wb, skipOrFatalFn := packetConnTestData(t, tt.net)
		if skipOrFatalFn != nil {
			skipOrFatalFn()
			continue
		}

		c1, err := ListenPacket(tt.net, tt.addr1)
		if err != nil {
			t.Fatal(err)
		}
		defer closer(c1, tt.net, tt.addr1, tt.addr2)
		c1.LocalAddr()

		c2, err := ListenPacket(tt.net, tt.addr2)
		if err != nil {
			t.Fatal(err)
		}
		defer closer(c2, tt.net, tt.addr1, tt.addr2)
		c2.LocalAddr()
		rb2 := make([]byte, 128)

		if _, err := c1.WriteTo(wb, c2.LocalAddr()); err != nil {
			t.Fatal(err)
		}
		if _, _, err := c2.ReadFrom(rb2); err != nil {
			t.Fatal(err)
		}
		if _, err := c2.WriteTo(wb, c1.LocalAddr()); err != nil {
			t.Fatal(err)
		}
		rb1 := make([]byte, 128)
		if _, _, err := c1.ReadFrom(rb1); err != nil {
			t.Fatal(err)
		}
	}
}

func TestConnAndPacketConn(t *testing.T) {
	var packetConnTests = []struct {
		net   string
		addr1 string
		addr2 string
	}{
		{"udp", "127.0.0.1:0", "127.0.0.1:0"},
		{"unixgram", testUnixAddr(t), testUnixAddr(t)},
	}

	closer := func(c PacketConn, net, addr1, addr2 string) {
		c.Close()
		switch net {
		case "unixgram":
			os.Remove(addr1)
			os.Remove(addr2)
		}
	}

	for _, tt := range packetConnTests {
		var wb []byte
		wb, skipOrFatalFn := packetConnTestData(t, tt.net)
		if skipOrFatalFn != nil {
			skipOrFatalFn()
			continue
		}

		c1, err := ListenPacket(tt.net, tt.addr1)
		if err != nil {
			t.Fatal(err)
		}
		defer closer(c1, tt.net, tt.addr1, tt.addr2)
		c1.LocalAddr()

		c2, err := Dial(tt.net, c1.LocalAddr().String())
		if err != nil {
			t.Fatal(err)
		}
		defer c2.Close()
		c2.LocalAddr()
		c2.RemoteAddr()

		if _, err := c2.Write(wb); err != nil {
			t.Fatal(err)
		}
		rb1 := make([]byte, 128)
		if _, _, err := c1.ReadFrom(rb1); err != nil {
			t.Fatal(err)
		}
		var dst Addr
		switch tt.net {
		case "unixgram":
			continue
		default:
			dst = c2.LocalAddr()
		}
		if _, err := c1.WriteTo(wb, dst); err != nil {
			t.Fatal(err)
		}
		rb2 := make([]byte, 128)
		if _, err := c2.Read(rb2); err != nil {
			t.Fatal(err)
		}
	}
}