// Copyright 2016 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package integration

import (
	"fmt"
	"io/ioutil"
	"math/rand"
	"net/url"
	"os"
	"sync"
	"testing"
	"time"

	"github.com/coreos/etcd/clientv3"
	"github.com/coreos/etcd/embed"
	"github.com/coreos/etcd/integration"
	"github.com/coreos/etcd/pkg/testutil"
	"golang.org/x/net/context"
)

// TestDialSetEndpoints ensures SetEndpoints can replace unavailable endpoints with available ones.
func TestDialSetEndpoints(t *testing.T) {
	defer testutil.AfterTest(t)
	clus := integration.NewClusterV3(t, &integration.ClusterConfig{Size: 3})
	defer clus.Terminate(t)

	// get endpoint list
	eps := make([]string, 3)
	for i := range eps {
		eps[i] = clus.Members[i].GRPCAddr()
	}
	toKill := rand.Intn(len(eps))

	cfg := clientv3.Config{Endpoints: []string{eps[toKill]}, DialTimeout: 1 * time.Second}
	cli, err := clientv3.New(cfg)
	if err != nil {
		t.Fatal(err)
	}
	defer cli.Close()

	// make a dead node
	clus.Members[toKill].Stop(t)
	clus.WaitLeader(t)

	// update client with available endpoints
	cli.SetEndpoints(eps[(toKill+1)%3])

	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
	if _, err = cli.Get(ctx, "foo", clientv3.WithSerializable()); err != nil {
		t.Fatal(err)
	}
	cancel()
}

var (
	testMu   sync.Mutex
	testPort = 31000
)

// TestDialWithHTTPS ensures that client can handle 'https' scheme in endpoints.
func TestDialWithHTTPS(t *testing.T) {
	defer testutil.AfterTest(t)

	testMu.Lock()
	port := testPort
	testPort += 10 // to avoid port conflicts
	testMu.Unlock()

	dir, err := ioutil.TempDir(os.TempDir(), "dial-test")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(dir)

	// set up single-node cluster with client auto TLS
	cfg := embed.NewConfig()
	cfg.Dir = dir

	cfg.ClientAutoTLS = true
	clientURL := url.URL{Scheme: "https", Host: fmt.Sprintf("localhost:%d", port)}
	cfg.LCUrls, cfg.ACUrls = []url.URL{clientURL}, []url.URL{clientURL}

	peerURL := url.URL{Scheme: "http", Host: fmt.Sprintf("localhost:%d", port+1)}
	cfg.LPUrls, cfg.APUrls = []url.URL{peerURL}, []url.URL{peerURL}
	cfg.InitialCluster = cfg.Name + "=" + peerURL.String()

	srv, err := embed.StartEtcd(cfg)
	if err != nil {
		t.Fatal(err)
	}
	nc := srv.Config() // overwrite config after processing ClientTLSInfo
	cfg = &nc

	<-srv.Server.ReadyNotify()
	defer func() {
		srv.Close()
		<-srv.Err()
	}()

	// wait for leader election to finish
	time.Sleep(500 * time.Millisecond)

	ccfg := clientv3.Config{Endpoints: []string{clientURL.String()}}
	tcfg, err := cfg.ClientTLSInfo.ClientConfig()
	if err != nil {
		t.Fatal(err)
	}
	ccfg.TLS = tcfg

	cli, err := clientv3.New(ccfg)
	if err != nil {
		t.Fatal(err)
	}
	defer cli.Close()

	if _, err = cli.Get(context.Background(), "foo"); err != nil {
		t.Fatal(err)
	}
}