// Copyright 2015-2016 Apcera Inc. All rights reserved.

package server

import (
	"net"
	"strings"
	"testing"
	"time"
)

var DefaultOptions = Options{
	Host:        "localhost",
	Port:        11222,
	HTTPPort:    11333,
	ClusterPort: 11444,
	ProfPort:    11280,
	NoLog:       true,
	NoSigs:      true,
}

// New Go Routine based server
func RunServer(opts *Options) *Server {
	if opts == nil {
		opts = &DefaultOptions
	}
	s := New(opts)
	if s == nil {
		panic("No NATS Server object returned.")
	}

	// Run server in Go routine.
	go s.Start()

	end := time.Now().Add(10 * time.Second)
	for time.Now().Before(end) {
		addr := s.GetListenEndpoint()
		if addr == "" {
			time.Sleep(10 * time.Millisecond)
			// Retry. We might take a little while to open a connection.
			continue
		}
		conn, err := net.Dial("tcp", addr)
		if err != nil {
			// Retry after 50ms
			time.Sleep(50 * time.Millisecond)
			continue
		}
		conn.Close()
		// Wait a bit to give a chance to the server to remove this
		// "client" from its state, which may otherwise interfere with
		// some tests.
		time.Sleep(25 * time.Millisecond)

		return s
	}
	panic("Unable to start NATS Server in Go Routine")

}

func TestStartupAndShutdown(t *testing.T) {
	s := RunServer(&DefaultOptions)
	defer s.Shutdown()

	if !s.isRunning() {
		t.Fatal("Could not run server")
	}

	// Debug stuff.
	numRoutes := s.NumRoutes()
	if numRoutes != 0 {
		t.Fatalf("Expected numRoutes to be 0 vs %d\n", numRoutes)
	}

	numRemotes := s.NumRemotes()
	if numRemotes != 0 {
		t.Fatalf("Expected numRemotes to be 0 vs %d\n", numRemotes)
	}

	numClients := s.NumClients()
	if numClients != 0 && numClients != 1 {
		t.Fatalf("Expected numClients to be 1 or 0 vs %d\n", numClients)
	}

	numSubscriptions := s.NumSubscriptions()
	if numSubscriptions != 0 {
		t.Fatalf("Expected numSubscriptions to be 0 vs %d\n", numSubscriptions)
	}
}

func TestTlsCipher(t *testing.T) {
	if strings.Compare(tlsCipher(0x0005), "TLS_RSA_WITH_RC4_128_SHA") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0x000a), "TLS_RSA_WITH_3DES_EDE_CBC_SHA") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0x002f), "TLS_RSA_WITH_AES_128_CBC_SHA") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0x0035), "TLS_RSA_WITH_AES_256_CBC_SHA") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc007), "TLS_ECDHE_ECDSA_WITH_RC4_128_SHA") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc009), "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc00a), "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc011), "TLS_ECDHE_RSA_WITH_RC4_128_SHA") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc012), "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc013), "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc014), "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA") != 0 {
		t.Fatalf("IUnknownnvalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc02f), "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc02b), "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc030), "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if strings.Compare(tlsCipher(0xc02c), "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384") != 0 {
		t.Fatalf("Invalid tls cipher")
	}
	if !strings.Contains(tlsCipher(0x9999), "Unknown") {
		t.Fatalf("Expected an unknown cipher.")
	}
}

func TestGetConnectURLs(t *testing.T) {
	opts := DefaultOptions
	opts.Port = 4222

	var globalIP net.IP

	checkGlobalConnectURLs := func() {
		s := New(&opts)
		defer s.Shutdown()

		urls := s.getClientConnectURLs()
		if len(urls) == 0 {
			t.Fatalf("Expected to get a list of urls, got none for listen addr: %v", opts.Host)
		}
		for _, u := range urls {
			tcpaddr, err := net.ResolveTCPAddr("tcp", u)
			if err != nil {
				t.Fatalf("Error resolving: %v", err)
			}
			ip := tcpaddr.IP
			if !ip.IsGlobalUnicast() {
				t.Fatalf("IP %v is not global", ip.String())
			}
			if ip.IsUnspecified() {
				t.Fatalf("IP %v is unspecified", ip.String())
			}
			addr := strings.TrimSuffix(u, ":4222")
			if addr == opts.Host {
				t.Fatalf("Returned url is not right: %v", u)
			}
			if globalIP == nil {
				globalIP = ip
			}
		}
	}

	listenAddrs := []string{"0.0.0.0", "::"}
	for _, listenAddr := range listenAddrs {
		opts.Host = listenAddr
		checkGlobalConnectURLs()
	}

	checkConnectURLsHasOnlyOne := func() {
		s := New(&opts)
		defer s.Shutdown()

		urls := s.getClientConnectURLs()
		if len(urls) != 1 {
			t.Fatalf("Expected one URL, got %v", urls)
		}
		tcpaddr, err := net.ResolveTCPAddr("tcp", urls[0])
		if err != nil {
			t.Fatalf("Error resolving: %v", err)
		}
		ip := tcpaddr.IP
		if ip.String() != opts.Host {
			t.Fatalf("Expected connect URL to be %v, got %v", opts.Host, ip.String())
		}
	}

	singleConnectReturned := []string{"127.0.0.1", "::1"}
	if globalIP != nil {
		singleConnectReturned = append(singleConnectReturned, globalIP.String())
	}
	for _, listenAddr := range singleConnectReturned {
		opts.Host = listenAddr
		checkConnectURLsHasOnlyOne()
	}
}

func TestNoDeadlockOnStartFailure(t *testing.T) {
	opts := DefaultOptions
	opts.Host = "x.x.x.x" // bad host
	opts.Port = 4222
	opts.ClusterHost = "localhost"
	opts.ClusterPort = 6222

	s := New(&opts)
	// This should return since it should fail to start a listener
	// on x.x.x.x:4222
	s.Start()
	// We should be able to shutdown
	s.Shutdown()
}