//
// Copyright (c) 2015 - 2018, Přemysl Eric Janouch <p@janouch.name>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//

package main

import (
	"crypto/tls"
	"net"
	"os"
	"reflect"
	"syscall"
	"testing"
)

func TestSplitString(t *testing.T) {
	var splitStringTests = []struct {
		s, delims   string
		ignoreEmpty bool
		result      []string
	}{
		{",a,,bc", ",", false, []string{"", "a", "", "bc"}},
		{",a,,bc", ",", true, []string{"a", "bc"}},
		{"a,;bc,", ",;", false, []string{"a", "", "bc", ""}},
		{"a,;bc,", ",;", true, []string{"a", "bc"}},
		{"", ",", false, []string{""}},
		{"", ",", true, nil},
	}

	for i, d := range splitStringTests {
		got := splitString(d.s, d.delims, d.ignoreEmpty)
		if !reflect.DeepEqual(got, d.result) {
			t.Errorf("case %d: %v should be %v\n", i, got, d.result)
		}
	}
}

func socketpair() (*os.File, *os.File, error) {
	pair, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
	if err != nil {
		return nil, nil, err
	}

	// See go #24331, this makes 1.11 use the internal poller
	// while there wasn't a way to achieve that before.
	if err := syscall.SetNonblock(int(pair[0]), true); err != nil {
		return nil, nil, err
	}
	if err := syscall.SetNonblock(int(pair[1]), true); err != nil {
		return nil, nil, err
	}

	fa := os.NewFile(uintptr(pair[0]), "a")
	if fa == nil {
		return nil, nil, os.ErrInvalid
	}

	fb := os.NewFile(uintptr(pair[1]), "b")
	if fb == nil {
		fa.Close()
		return nil, nil, os.ErrInvalid
	}

	return fa, fb, nil
}

func TestDetectTLS(t *testing.T) {
	detectTLSFromFunc := func(t *testing.T, writer func(net.Conn)) bool {
		// net.Pipe doesn't use file descriptors, we need a socketpair.
		sockA, sockB, err := socketpair()
		if err != nil {
			t.Fatal(err)
		}
		defer sockA.Close()
		defer sockB.Close()

		fcB, err := net.FileConn(sockB)
		if err != nil {
			t.Fatal(err)
		}
		go writer(fcB)

		fcA, err := net.FileConn(sockA)
		if err != nil {
			t.Fatal(err)
		}
		sc, err := fcA.(syscall.Conn).SyscallConn()
		if err != nil {
			t.Fatal(err)
		}
		return detectTLS(sc)
	}

	t.Run("SSL_2.0", func(t *testing.T) {
		if !detectTLSFromFunc(t, func(fc net.Conn) {
			// The obsolete, useless, unsupported SSL 2.0 record format.
			_, _ = fc.Write([]byte{0x80, 0x01, 0x01})
		}) {
			t.Error("could not detect SSL")
		}
	})
	t.Run("crypto_tls", func(t *testing.T) {
		if !detectTLSFromFunc(t, func(fc net.Conn) {
			conn := tls.Client(fc, &tls.Config{InsecureSkipVerify: true})
			_ = conn.Handshake()
		}) {
			t.Error("could not detect TLS")
		}
	})
	t.Run("text", func(t *testing.T) {
		if detectTLSFromFunc(t, func(fc net.Conn) {
			_, _ = fc.Write([]byte("ПРЕВЕД"))
		}) {
			t.Error("detected UTF-8 as TLS")
		}
	})
	t.Run("EOF", func(t *testing.T) {
		type connCloseWriter interface {
			net.Conn
			CloseWrite() error
		}
		if detectTLSFromFunc(t, func(fc net.Conn) {
			_ = fc.(connCloseWriter).CloseWrite()
		}) {
			t.Error("detected EOF as TLS")
		}
	})
}

func TestIRC(t *testing.T) {
	msg := ircParseMessage(
		`@first=a\:\s\r\n\\;2nd :srv hi there :good m8 :how are you?`)

	if !reflect.DeepEqual(msg.tags, map[string]string{
		"first": "a; \r\n\\",
		"2nd":   "",
	}) {
		t.Error("tags parsed incorrectly")
	}

	if msg.nick != "srv" || msg.user != "" || msg.host != "" {
		t.Error("server name parsed incorrectly")
	}
	if msg.command != "hi" {
		t.Error("command name parsed incorrectly")
	}
	if !reflect.DeepEqual(msg.params,
		[]string{"there", "good m8 :how are you?"}) {
		t.Error("params parsed incorrectly")
	}

	if !ircEqual("[fag]^", "{FAG}~") {
		t.Error("string case comparison not according to RFC 2812")
	}

	// TODO: More tests.
}