/*
 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

     https://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 webservice

import (
	"encoding/json"
	"io/ioutil"
	"net/http"
	"net/url"
	"testing"
	"time"

	"opendev.org/airship/airshipui/internal/configs"
	"opendev.org/airship/airshipui/testutil"

	"github.com/gorilla/websocket"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

const (
	serverAddr        string = "localhost:8080"
	testBaremetalHTML string = "../integrations/ctl/testdata/baremetal.html"
	testDocumentHTML  string = "../integrations/ctl/testdata/document.html"

	// client messages
	initialize       string = `{"type":"electron","component":"initialize"}`
	keepalive        string = `{"type":"electron","component":"keepalive"}`
	unknownType      string = `{"type":"fake_type","component":"initialize"}`
	unknownComponent string = `{"type":"electron","component":"fake_component"}`
	document         string = `{"type":"airshipctl","component":"document","subcomponent":"getDefaults"}`
	baremetal        string = `{"type":"airshipctl","component":"baremetal","subcomponent":"getDefaults"}`
	config           string = `{"type":"airshipctl","component":"config","subcomponent":"getDefaults"}`
)

func init() {
	go WebServer()
}

func TestClientInit(t *testing.T) {
	client, err := NewTestClient()
	require.NoError(t, err)
	defer client.Close()

	// simulate config provided by airshipui.json
	configs.UIConfig = testutil.DummyCompleteConfig()

	// get server response to "initialize" message from client
	response, err := getResponse(client, initialize)
	require.NoError(t, err)

	expected := configs.WsMessage{
		Type:            configs.Electron,
		Component:       configs.Initialize,
		IsAuthenticated: false,
		Dashboards: []configs.Cluster{
			testutil.DummyClusterConfig(),
		},
		Plugins: []configs.Plugin{
			testutil.DummyPluginWithDashboardConfig(),
			testutil.DummyPluginNoDashboard(),
		},
		Authentication: testutil.DummyAuthMethodConfig(),
		// don't fail on timestamp diff
		Timestamp: response.Timestamp,
	}

	assert.Equal(t, expected, response)
}

func TestClientInitNoAuth(t *testing.T) {
	client, err := NewTestClient()
	require.NoError(t, err)
	defer client.Close()

	// simulate config provided by airshipui.json
	configs.UIConfig = testutil.DummyConfigNoAuth()

	isAuthenticated = false

	response, err := getResponse(client, initialize)
	require.NoError(t, err)

	expected := configs.WsMessage{
		Type:      configs.Electron,
		Component: configs.Initialize,
		// isAuthenticated should now be true in response
		IsAuthenticated: true,
		Dashboards: []configs.Cluster{
			testutil.DummyClusterConfig(),
		},
		Plugins: []configs.Plugin{
			testutil.DummyPluginWithDashboardConfig(),
			testutil.DummyPluginNoDashboard(),
		},
		// don't fail on timestamp diff
		Timestamp: response.Timestamp,
	}

	assert.Equal(t, expected, response)
}

func TestKeepalive(t *testing.T) {
	client, err := NewTestClient()
	require.NoError(t, err)
	defer client.Close()

	// get server response to "keepalive" message from client
	response, err := getResponse(client, keepalive)
	require.NoError(t, err)

	expected := configs.WsMessage{
		Type:      configs.Electron,
		Component: configs.Keepalive,
		// don't fail on timestamp diff
		Timestamp: response.Timestamp,
	}

	assert.Equal(t, expected, response)
}

func TestUnknownType(t *testing.T) {
	client, err := NewTestClient()
	require.NoError(t, err)
	defer client.Close()

	response, err := getResponse(client, unknownType)
	require.NoError(t, err)

	expected := configs.WsMessage{
		Type:      "fake_type",
		Component: configs.Initialize,
		// don't fail on timestamp diff
		Timestamp: response.Timestamp,
		Error:     "Requested type: fake_type, not found",
	}

	assert.Equal(t, expected, response)
}

func TestUnknownComponent(t *testing.T) {
	client, err := NewTestClient()
	require.NoError(t, err)
	defer client.Close()

	response, err := getResponse(client, unknownComponent)
	require.NoError(t, err)

	expected := configs.WsMessage{
		Type:      configs.Electron,
		Component: "fake_component",
		// don't fail on timestamp diff
		Timestamp: response.Timestamp,
		Error:     "Requested component: fake_component, not found",
	}

	assert.Equal(t, expected, response)
}

func TestHandleAuth(t *testing.T) {
	client, err := NewTestClient()
	require.NoError(t, err)
	defer client.Close()

	isAuthenticated = false

	// trigger web server's handleAuth function
	_, err = http.Get("http://localhost:8080/auth")
	require.NoError(t, err)

	var response configs.WsMessage
	err = client.ReadJSON(&response)
	require.NoError(t, err)

	expected := configs.WsMessage{
		Type:      configs.Electron,
		Component: configs.Authcomplete,
		// don't fail on timestamp diff
		Timestamp: response.Timestamp,
	}

	// isAuthenticated should now be true after auth complete
	assert.Equal(t, isAuthenticated, true)
	assert.Equal(t, expected, response)
}

func TestHandleDocumentRequest(t *testing.T) {
	client, err := NewTestClient()
	require.NoError(t, err)
	defer client.Close()

	expectedHTML, err := ioutil.ReadFile(testDocumentHTML)
	require.NoError(t, err)

	response, err := getResponse(client, document)
	require.NoError(t, err)

	expected := configs.WsMessage{
		Type:         configs.AirshipCTL,
		Component:    configs.Document,
		SubComponent: configs.GetDefaults,
		HTML:         string(expectedHTML),
		// don't fail on timestamp diff
		Timestamp: response.Timestamp,
	}

	assert.Equal(t, expected, response)
}

func TestHandleBaremetalRequest(t *testing.T) {
	client, err := NewTestClient()
	require.NoError(t, err)
	defer client.Close()

	expectedHTML, err := ioutil.ReadFile(testBaremetalHTML)
	require.NoError(t, err)

	response, err := getResponse(client, baremetal)
	require.NoError(t, err)

	expected := configs.WsMessage{
		Type:         configs.AirshipCTL,
		Component:    configs.Baremetal,
		SubComponent: configs.GetDefaults,
		HTML:         string(expectedHTML),
		// don't fail on timestamp diff
		Timestamp: response.Timestamp,
	}

	assert.Equal(t, expected, response)
}

func TestHandleConfigRequest(t *testing.T) {
	client, err := NewTestClient()
	require.NoError(t, err)
	defer client.Close()

	response, err := getResponse(client, config)
	require.NoError(t, err)

	expected := configs.WsMessage{
		Type:         configs.AirshipCTL,
		Component:    configs.CTLConfig,
		SubComponent: configs.GetDefaults,
	}

	assert.Equal(t, expected.Type, response.Type)
	assert.Equal(t, expected.Component, response.Component)
	assert.Equal(t, expected.SubComponent, response.SubComponent)

	// NOTE(mfuller): integrations/ctl 'client' gets initialized
	// *before* any env vars can be set here in tests, so client
	// will always be initialized with default config file locations.
	// Client is not exported, so we can't set it directly here. We'll
	// simply make sure there's no Error value and that HTML has
	// len > 0. Full testing of this response is covered in the
	// integrations/ctl tests.

	assert.Len(t, response.Error, 0)
	assert.Greater(t, len(response.HTML), 0)
}

func getResponse(client *websocket.Conn, message string) (configs.WsMessage, error) {
	err := client.WriteJSON(json.RawMessage(message))
	if err != nil {
		return configs.WsMessage{}, err
	}

	var response configs.WsMessage
	err = client.ReadJSON(&response)
	if err != nil {
		return configs.WsMessage{}, err
	}

	return response, nil
}

func NewTestClient() (*websocket.Conn, error) {
	var err error
	var client *websocket.Conn
	u := url.URL{Scheme: "ws", Host: serverAddr, Path: "/ws"}
	// allow multiple attempts to establish websocket in case server isn't ready
	for i := 0; i < 5; i++ {
		client, _, err = websocket.DefaultDialer.Dial(u.String(), nil)
		if err == nil {
			return client, nil
		}
		time.Sleep(2 * time.Second)
	}
	return nil, err
}