package api

import (
	"bytes"
	"compress/gzip"
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"net/url"
	"strings"
	"testing"
	"time"

	"github.com/hashicorp/nomad/api/internal/testutil"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

type configCallback func(c *Config)

// seen is used to track which tests we have already marked as parallel
var seen map[*testing.T]struct{}

func init() {
	seen = make(map[*testing.T]struct{})
}

func makeACLClient(t *testing.T, cb1 configCallback,
	cb2 testutil.ServerConfigCallback) (*Client, *testutil.TestServer, *ACLToken) {
	client, server := makeClient(t, cb1, func(c *testutil.TestServerConfig) {
		c.ACL.Enabled = true
		if cb2 != nil {
			cb2(c)
		}
	})

	// Get the root token
	root, _, err := client.ACLTokens().Bootstrap(nil)
	if err != nil {
		t.Fatalf("failed to bootstrap ACLs: %v", err)
	}
	client.SetSecretID(root.SecretID)
	return client, server, root
}

func makeClient(t *testing.T, cb1 configCallback,
	cb2 testutil.ServerConfigCallback) (*Client, *testutil.TestServer) {
	// Make client config
	conf := DefaultConfig()
	if cb1 != nil {
		cb1(conf)
	}

	// Create server
	server := testutil.NewTestServer(t, cb2)
	conf.Address = "http://" + server.HTTPAddr

	// Create client
	client, err := NewClient(conf)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	return client, server
}

func TestRequestTime(t *testing.T) {
	testutil.Parallel(t)
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		time.Sleep(100 * time.Millisecond)
		d, err := json.Marshal(struct{ Done bool }{true})
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		w.Write(d)
	}))
	defer srv.Close()

	conf := DefaultConfig()
	conf.Address = srv.URL

	client, err := NewClient(conf)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	var out interface{}

	qm, err := client.query("/", &out, nil)
	if err != nil {
		t.Fatalf("query err: %v", err)
	}
	if qm.RequestTime == 0 {
		t.Errorf("bad request time: %d", qm.RequestTime)
	}

	wm, err := client.write("/", struct{ S string }{"input"}, &out, nil)
	if err != nil {
		t.Fatalf("write err: %v", err)
	}
	if wm.RequestTime == 0 {
		t.Errorf("bad request time: %d", wm.RequestTime)
	}

	wm, err = client.delete("/", nil, &out, nil)
	if err != nil {
		t.Fatalf("delete err: %v", err)
	}
	if wm.RequestTime == 0 {
		t.Errorf("bad request time: %d", wm.RequestTime)
	}
}

func TestDefaultConfig_env(t *testing.T) {
	testutil.Parallel(t)
	testURL := "http://1.2.3.4:5678"
	auth := []string{"nomaduser", "12345"}
	region := "test"
	namespace := "dev"
	token := "foobar"

	t.Setenv("NOMAD_ADDR", testURL)
	t.Setenv("NOMAD_REGION", region)
	t.Setenv("NOMAD_NAMESPACE", namespace)
	t.Setenv("NOMAD_HTTP_AUTH", strings.Join(auth, ":"))
	t.Setenv("NOMAD_TOKEN", token)

	config := DefaultConfig()

	if config.Address != testURL {
		t.Errorf("expected %q to be %q", config.Address, testURL)
	}

	if config.Region != region {
		t.Errorf("expected %q to be %q", config.Region, region)
	}

	if config.Namespace != namespace {
		t.Errorf("expected %q to be %q", config.Namespace, namespace)
	}

	if config.HttpAuth.Username != auth[0] {
		t.Errorf("expected %q to be %q", config.HttpAuth.Username, auth[0])
	}

	if config.HttpAuth.Password != auth[1] {
		t.Errorf("expected %q to be %q", config.HttpAuth.Password, auth[1])
	}

	if config.SecretID != token {
		t.Errorf("Expected %q to be %q", config.SecretID, token)
	}
}

func TestSetQueryOptions(t *testing.T) {
	testutil.Parallel(t)
	c, s := makeClient(t, nil, nil)
	defer s.Stop()

	r, _ := c.newRequest("GET", "/v1/jobs")
	q := &QueryOptions{
		Region:     "foo",
		Namespace:  "bar",
		AllowStale: true,
		WaitIndex:  1000,
		WaitTime:   100 * time.Second,
		AuthToken:  "foobar",
		Reverse:    true,
	}
	r.setQueryOptions(q)

	try := func(key, exp string) {
		result := r.params.Get(key)
		require.Equal(t, exp, result)
	}

	// Check auth token is set
	require.Equal(t, "foobar", r.token)

	// Check query parameters are set
	try("region", "foo")
	try("namespace", "bar")
	try("stale", "") // should not be present
	try("index", "1000")
	try("wait", "100000ms")
	try("reverse", "true")
}

func TestQueryOptionsContext(t *testing.T) {
	testutil.Parallel(t)
	ctx, cancel := context.WithCancel(context.Background())
	c, s := makeClient(t, nil, nil)
	defer s.Stop()
	q := (&QueryOptions{
		WaitIndex: 10000,
	}).WithContext(ctx)

	if q.ctx != ctx {
		t.Fatalf("expected context to be set")
	}

	go func() {
		cancel()
	}()
	_, _, err := c.Jobs().List(q)
	if !errors.Is(err, context.Canceled) {
		t.Fatalf("expected job wait to fail with canceled, got %s", err)
	}
}

func TestWriteOptionsContext(t *testing.T) {
	// No blocking query to test a real cancel of a pending request so
	// just test that if we pass a pre-canceled context, writes fail quickly
	testutil.Parallel(t)

	c, err := NewClient(DefaultConfig())
	if err != nil {
		t.Fatalf("failed to initialize client: %s", err)
	}

	ctx, cancel := context.WithCancel(context.Background())
	w := (&WriteOptions{}).WithContext(ctx)

	if w.ctx != ctx {
		t.Fatalf("expected context to be set")
	}

	cancel()

	_, _, err = c.Jobs().Deregister("jobid", true, w)
	if !errors.Is(err, context.Canceled) {
		t.Fatalf("expected job to fail with canceled, got %s", err)
	}
}

func TestSetWriteOptions(t *testing.T) {
	testutil.Parallel(t)
	c, s := makeClient(t, nil, nil)
	defer s.Stop()

	r, _ := c.newRequest("GET", "/v1/jobs")
	q := &WriteOptions{
		Region:           "foo",
		Namespace:        "bar",
		AuthToken:        "foobar",
		IdempotencyToken: "idempotent",
	}
	r.setWriteOptions(q)

	if r.params.Get("region") != "foo" {
		t.Fatalf("bad: %v", r.params)
	}
	if r.params.Get("namespace") != "bar" {
		t.Fatalf("bad: %v", r.params)
	}
	if r.params.Get("idempotency_token") != "idempotent" {
		t.Fatalf("bad: %v", r.params)
	}
	if r.token != "foobar" {
		t.Fatalf("bad: %v", r.token)
	}
}

func TestRequestToHTTP(t *testing.T) {
	testutil.Parallel(t)
	c, s := makeClient(t, nil, nil)
	defer s.Stop()

	r, _ := c.newRequest("DELETE", "/v1/jobs/foo")
	q := &QueryOptions{
		Region:    "foo",
		Namespace: "bar",
		AuthToken: "foobar",
	}
	r.setQueryOptions(q)
	req, err := r.toHTTP()
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	if req.Method != "DELETE" {
		t.Fatalf("bad: %v", req)
	}
	if req.URL.RequestURI() != "/v1/jobs/foo?namespace=bar&region=foo" {
		t.Fatalf("bad: %v", req)
	}
	if req.Header.Get("X-Nomad-Token") != "foobar" {
		t.Fatalf("bad: %v", req)
	}
}

func TestParseQueryMeta(t *testing.T) {
	testutil.Parallel(t)
	resp := &http.Response{
		Header: make(map[string][]string),
	}
	resp.Header.Set("X-Nomad-Index", "12345")
	resp.Header.Set("X-Nomad-LastContact", "80")
	resp.Header.Set("X-Nomad-KnownLeader", "true")

	qm := &QueryMeta{}
	if err := parseQueryMeta(resp, qm); err != nil {
		t.Fatalf("err: %v", err)
	}

	if qm.LastIndex != 12345 {
		t.Fatalf("Bad: %v", qm)
	}
	if qm.LastContact != 80*time.Millisecond {
		t.Fatalf("Bad: %v", qm)
	}
	if !qm.KnownLeader {
		t.Fatalf("Bad: %v", qm)
	}
}

func TestParseWriteMeta(t *testing.T) {
	testutil.Parallel(t)
	resp := &http.Response{
		Header: make(map[string][]string),
	}
	resp.Header.Set("X-Nomad-Index", "12345")

	wm := &WriteMeta{}
	if err := parseWriteMeta(resp, wm); err != nil {
		t.Fatalf("err: %v", err)
	}

	if wm.LastIndex != 12345 {
		t.Fatalf("Bad: %v", wm)
	}
}

func TestClientHeader(t *testing.T) {
	testutil.Parallel(t)
	c, s := makeClient(t, func(c *Config) {
		c.Headers = http.Header{
			"Hello": []string{"World"},
		}
	}, nil)
	defer s.Stop()

	r, _ := c.newRequest("GET", "/v1/jobs")

	if r.header.Get("Hello") != "World" {
		t.Fatalf("bad: %v", r.header)
	}
}

func TestQueryString(t *testing.T) {
	testutil.Parallel(t)
	c, s := makeClient(t, nil, nil)
	defer s.Stop()

	r, _ := c.newRequest("PUT", "/v1/abc?foo=bar&baz=zip")
	q := &WriteOptions{
		Region:    "foo",
		Namespace: "bar",
	}
	r.setWriteOptions(q)

	req, err := r.toHTTP()
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	if uri := req.URL.RequestURI(); uri != "/v1/abc?baz=zip&foo=bar&namespace=bar&region=foo" {
		t.Fatalf("bad uri: %q", uri)
	}
}

func TestClient_NodeClient(t *testing.T) {
	http := "testdomain:4646"
	tlsNode := func(string, *QueryOptions) (*Node, *QueryMeta, error) {
		return &Node{
			ID:         generateUUID(),
			Status:     "ready",
			HTTPAddr:   http,
			TLSEnabled: true,
		}, nil, nil
	}
	noTlsNode := func(string, *QueryOptions) (*Node, *QueryMeta, error) {
		return &Node{
			ID:         generateUUID(),
			Status:     "ready",
			HTTPAddr:   http,
			TLSEnabled: false,
		}, nil, nil
	}

	optionNoRegion := &QueryOptions{}
	optionRegion := &QueryOptions{
		Region: "foo",
	}

	clientNoRegion, err := NewClient(DefaultConfig())
	assert.Nil(t, err)

	regionConfig := DefaultConfig()
	regionConfig.Region = "bar"
	clientRegion, err := NewClient(regionConfig)
	assert.Nil(t, err)

	expectedTLSAddr := fmt.Sprintf("https://%s", http)
	expectedNoTLSAddr := fmt.Sprintf("http://%s", http)

	cases := []struct {
		Node                  nodeLookup
		QueryOptions          *QueryOptions
		Client                *Client
		ExpectedAddr          string
		ExpectedRegion        string
		ExpectedTLSServerName string
	}{
		{
			Node:                  tlsNode,
			QueryOptions:          optionNoRegion,
			Client:                clientNoRegion,
			ExpectedAddr:          expectedTLSAddr,
			ExpectedRegion:        "global",
			ExpectedTLSServerName: "client.global.nomad",
		},
		{
			Node:                  tlsNode,
			QueryOptions:          optionRegion,
			Client:                clientNoRegion,
			ExpectedAddr:          expectedTLSAddr,
			ExpectedRegion:        "foo",
			ExpectedTLSServerName: "client.foo.nomad",
		},
		{
			Node:                  tlsNode,
			QueryOptions:          optionRegion,
			Client:                clientRegion,
			ExpectedAddr:          expectedTLSAddr,
			ExpectedRegion:        "foo",
			ExpectedTLSServerName: "client.foo.nomad",
		},
		{
			Node:                  tlsNode,
			QueryOptions:          optionNoRegion,
			Client:                clientRegion,
			ExpectedAddr:          expectedTLSAddr,
			ExpectedRegion:        "bar",
			ExpectedTLSServerName: "client.bar.nomad",
		},
		{
			Node:                  noTlsNode,
			QueryOptions:          optionNoRegion,
			Client:                clientNoRegion,
			ExpectedAddr:          expectedNoTLSAddr,
			ExpectedRegion:        "global",
			ExpectedTLSServerName: "",
		},
		{
			Node:                  noTlsNode,
			QueryOptions:          optionRegion,
			Client:                clientNoRegion,
			ExpectedAddr:          expectedNoTLSAddr,
			ExpectedRegion:        "foo",
			ExpectedTLSServerName: "",
		},
		{
			Node:                  noTlsNode,
			QueryOptions:          optionRegion,
			Client:                clientRegion,
			ExpectedAddr:          expectedNoTLSAddr,
			ExpectedRegion:        "foo",
			ExpectedTLSServerName: "",
		},
		{
			Node:                  noTlsNode,
			QueryOptions:          optionNoRegion,
			Client:                clientRegion,
			ExpectedAddr:          expectedNoTLSAddr,
			ExpectedRegion:        "bar",
			ExpectedTLSServerName: "",
		},
	}

	for _, c := range cases {
		name := fmt.Sprintf("%s__%s__%s", c.ExpectedAddr, c.ExpectedRegion, c.ExpectedTLSServerName)
		t.Run(name, func(t *testing.T) {
			assert := assert.New(t)
			nodeClient, err := c.Client.getNodeClientImpl("testID", -1, c.QueryOptions, c.Node)
			assert.Nil(err)
			assert.Equal(c.ExpectedRegion, nodeClient.config.Region)
			assert.Equal(c.ExpectedAddr, nodeClient.config.Address)
			assert.NotNil(nodeClient.config.TLSConfig)
			assert.Equal(c.ExpectedTLSServerName, nodeClient.config.TLSConfig.TLSServerName)
		})
	}
}

func TestCloneHttpClient(t *testing.T) {
	client := defaultHttpClient()
	originalTransport := client.Transport.(*http.Transport)
	originalTransport.Proxy = func(*http.Request) (*url.URL, error) {
		return nil, errors.New("stub function")
	}

	t.Run("closing with negative timeout", func(t *testing.T) {
		clone, err := cloneWithTimeout(client, -1)
		require.True(t, originalTransport == client.Transport, "original transport changed")
		require.NoError(t, err)
		require.Equal(t, client, clone)
		require.True(t, client == clone)
	})

	t.Run("closing with positive timeout", func(t *testing.T) {
		clone, err := cloneWithTimeout(client, 1*time.Second)
		require.True(t, originalTransport == client.Transport, "original transport changed")
		require.NoError(t, err)
		require.NotEqual(t, client, clone)
		require.True(t, client != clone)
		require.True(t, client.Transport != clone.Transport)

		// test that proxy function is the same in clone
		clonedProxy := clone.Transport.(*http.Transport).Proxy
		require.NotNil(t, clonedProxy)
		_, err = clonedProxy(nil)
		require.Error(t, err)
		require.Equal(t, "stub function", err.Error())

		// if we reset transport, the strutcs are equal
		clone.Transport = originalTransport
		require.Equal(t, client, clone)
	})

}

func TestClient_HeaderRaceCondition(t *testing.T) {
	require := require.New(t)

	conf := DefaultConfig()
	conf.Headers = map[string][]string{
		"test-header": {"a"},
	}
	client, err := NewClient(conf)
	require.NoError(err)

	c := make(chan int)

	go func() {
		req, _ := client.newRequest("GET", "/any/path/will/do")
		r, _ := req.toHTTP()
		c <- len(r.Header)
	}()
	req, _ := client.newRequest("GET", "/any/path/will/do")
	r, _ := req.toHTTP()

	require.Len(r.Header, 2, "local request should have two headers")
	require.Equal(2, <-c, "goroutine  request should have two headers")
	require.Len(conf.Headers, 1, "config headers should not mutate")
}

func TestClient_autoUnzip(t *testing.T) {
	var client *Client = nil

	try := func(resp *http.Response, exp error) {
		err := client.autoUnzip(resp)
		require.Equal(t, exp, err)
	}

	// response object is nil
	try(nil, nil)

	// response.Body is nil
	try(new(http.Response), nil)

	// content-encoding is not gzip
	try(&http.Response{
		Header: http.Header{"Content-Encoding": []string{"text"}},
	}, nil)

	// content-encoding is gzip but body is empty
	try(&http.Response{
		Header: http.Header{"Content-Encoding": []string{"gzip"}},
		Body:   io.NopCloser(bytes.NewBuffer([]byte{})),
	}, nil)

	// content-encoding is gzip but body is invalid gzip
	try(&http.Response{
		Header: http.Header{"Content-Encoding": []string{"gzip"}},
		Body:   io.NopCloser(bytes.NewBuffer([]byte("not a zip"))),
	}, errors.New("unexpected EOF"))

	// sample gzip payload
	var b bytes.Buffer
	w := gzip.NewWriter(&b)
	_, err := w.Write([]byte("hello world"))
	require.NoError(t, err)
	err = w.Close()
	require.NoError(t, err)

	// content-encoding is gzip and body is gzip data
	try(&http.Response{
		Header: http.Header{"Content-Encoding": []string{"gzip"}},
		Body:   io.NopCloser(&b),
	}, nil)
}