// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

package app

import (
	"encoding/json"
	"io/ioutil"
	"os"
	"path/filepath"
	"time"

	l4g "github.com/alecthomas/log4go"

	"github.com/mattermost/mattermost-server/model"
	"github.com/mattermost/mattermost-server/plugin"
	"github.com/mattermost/mattermost-server/plugin/pluginenv"
	"github.com/mattermost/mattermost-server/store"
	"github.com/mattermost/mattermost-server/store/sqlstore"
	"github.com/mattermost/mattermost-server/store/storetest"
	"github.com/mattermost/mattermost-server/utils"
)

type TestHelper struct {
	App          *App
	BasicTeam    *model.Team
	BasicUser    *model.User
	BasicUser2   *model.User
	BasicChannel *model.Channel
	BasicPost    *model.Post

	tempWorkspace string
	pluginHooks   map[string]plugin.Hooks
}

type persistentTestStore struct {
	store.Store
}

func (*persistentTestStore) Close() {}

var testStoreContainer *storetest.RunningContainer
var testStore *persistentTestStore

// UseTestStore sets the container and corresponding settings to use for tests. Once the tests are
// complete (e.g. at the end of your TestMain implementation), you should call StopTestStore.
func UseTestStore(container *storetest.RunningContainer, settings *model.SqlSettings) {
	testStoreContainer = container
	testStore = &persistentTestStore{store.NewLayeredStore(sqlstore.NewSqlSupplier(*settings, nil), nil, nil)}
}

func StopTestStore() {
	if testStoreContainer != nil {
		testStoreContainer.Stop()
		testStoreContainer = nil
	}
}

func setupTestHelper(enterprise bool) *TestHelper {
	var options []Option
	if testStore != nil {
		options = append(options, StoreOverride(testStore))
	}

	th := &TestHelper{
		App:         New(options...),
		pluginHooks: make(map[string]plugin.Hooks),
	}

	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.TeamSettings.MaxUsersPerTeam = 50 })
	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.RateLimitSettings.Enable = false })
	utils.DisableDebugLogForTest()
	prevListenAddress := *th.App.Config().ServiceSettings.ListenAddress
	if testStore != nil {
		th.App.UpdateConfig(func(cfg *model.Config) { *cfg.ServiceSettings.ListenAddress = ":0" })
	}
	th.App.StartServer()
	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.ServiceSettings.ListenAddress = prevListenAddress })
	utils.EnableDebugLogForTest()
	th.App.Srv.Store.MarkSystemRanUnitTests()

	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.TeamSettings.EnableOpenServer = true })

	utils.SetIsLicensed(enterprise)
	if enterprise {
		utils.License().Features.SetDefaults()
	}

	return th
}

func SetupEnterprise() *TestHelper {
	return setupTestHelper(true)
}

func Setup() *TestHelper {
	return setupTestHelper(false)
}

func (me *TestHelper) InitBasic() *TestHelper {
	me.BasicTeam = me.CreateTeam()
	me.BasicUser = me.CreateUser()
	me.LinkUserToTeam(me.BasicUser, me.BasicTeam)
	me.BasicUser2 = me.CreateUser()
	me.LinkUserToTeam(me.BasicUser2, me.BasicTeam)
	me.BasicChannel = me.CreateChannel(me.BasicTeam)
	me.BasicPost = me.CreatePost(me.BasicChannel)

	return me
}

func (me *TestHelper) MakeUsername() string {
	return "un_" + model.NewId()
}

func (me *TestHelper) MakeEmail() string {
	return "success_" + model.NewId() + "@simulator.amazonses.com"
}

func (me *TestHelper) CreateTeam() *model.Team {
	id := model.NewId()
	team := &model.Team{
		DisplayName: "dn_" + id,
		Name:        "name" + id,
		Email:       "success+" + id + "@simulator.amazonses.com",
		Type:        model.TEAM_OPEN,
	}

	utils.DisableDebugLogForTest()
	var err *model.AppError
	if team, err = me.App.CreateTeam(team); err != nil {
		l4g.Error(err.Error())
		l4g.Close()
		time.Sleep(time.Second)
		panic(err)
	}
	utils.EnableDebugLogForTest()
	return team
}

func (me *TestHelper) CreateUser() *model.User {
	id := model.NewId()

	user := &model.User{
		Email:         "success+" + id + "@simulator.amazonses.com",
		Username:      "un_" + id,
		Nickname:      "nn_" + id,
		Password:      "Password1",
		EmailVerified: true,
	}

	utils.DisableDebugLogForTest()
	var err *model.AppError
	if user, err = me.App.CreateUser(user); err != nil {
		l4g.Error(err.Error())
		l4g.Close()
		time.Sleep(time.Second)
		panic(err)
	}
	utils.EnableDebugLogForTest()
	return user
}

func (me *TestHelper) CreateChannel(team *model.Team) *model.Channel {
	return me.createChannel(team, model.CHANNEL_OPEN)
}

func (me *TestHelper) CreatePrivateChannel(team *model.Team) *model.Channel {
	return me.createChannel(team, model.CHANNEL_PRIVATE)
}

func (me *TestHelper) createChannel(team *model.Team, channelType string) *model.Channel {
	id := model.NewId()

	channel := &model.Channel{
		DisplayName: "dn_" + id,
		Name:        "name_" + id,
		Type:        channelType,
		TeamId:      team.Id,
		CreatorId:   me.BasicUser.Id,
	}

	utils.DisableDebugLogForTest()
	var err *model.AppError
	if channel, err = me.App.CreateChannel(channel, true); err != nil {
		l4g.Error(err.Error())
		l4g.Close()
		time.Sleep(time.Second)
		panic(err)
	}
	utils.EnableDebugLogForTest()
	return channel
}

func (me *TestHelper) CreatePost(channel *model.Channel) *model.Post {
	id := model.NewId()

	post := &model.Post{
		UserId:    me.BasicUser.Id,
		ChannelId: channel.Id,
		Message:   "message_" + id,
	}

	utils.DisableDebugLogForTest()
	var err *model.AppError
	if post, err = me.App.CreatePost(post, channel, false); err != nil {
		l4g.Error(err.Error())
		l4g.Close()
		time.Sleep(time.Second)
		panic(err)
	}
	utils.EnableDebugLogForTest()
	return post
}

func (me *TestHelper) LinkUserToTeam(user *model.User, team *model.Team) {
	utils.DisableDebugLogForTest()

	err := me.App.JoinUserToTeam(team, user, "")
	if err != nil {
		l4g.Error(err.Error())
		l4g.Close()
		time.Sleep(time.Second)
		panic(err)
	}

	utils.EnableDebugLogForTest()
}

func (me *TestHelper) TearDown() {
	me.App.Shutdown()
	if err := recover(); err != nil {
		StopTestStore()
		panic(err)
	}
	if me.tempWorkspace != "" {
		os.RemoveAll(me.tempWorkspace)
	}
}

type mockPluginSupervisor struct {
	hooks plugin.Hooks
}

func (s *mockPluginSupervisor) Start(api plugin.API) error {
	return s.hooks.OnActivate(api)
}

func (s *mockPluginSupervisor) Stop() error {
	return nil
}

func (s *mockPluginSupervisor) Hooks() plugin.Hooks {
	return s.hooks
}

func (me *TestHelper) InstallPlugin(manifest *model.Manifest, hooks plugin.Hooks) {
	if me.tempWorkspace == "" {
		dir, err := ioutil.TempDir("", "apptest")
		if err != nil {
			panic(err)
		}
		me.tempWorkspace = dir
	}

	pluginDir := filepath.Join(me.tempWorkspace, "plugins")
	webappDir := filepath.Join(me.tempWorkspace, "webapp")
	me.App.InitPlugins(pluginDir, webappDir, func(bundle *model.BundleInfo) (plugin.Supervisor, error) {
		if hooks, ok := me.pluginHooks[bundle.Manifest.Id]; ok {
			return &mockPluginSupervisor{hooks}, nil
		}
		return pluginenv.DefaultSupervisorProvider(bundle)
	})

	me.pluginHooks[manifest.Id] = hooks

	manifestCopy := *manifest
	if manifestCopy.Backend == nil {
		manifestCopy.Backend = &model.ManifestBackend{}
	}
	manifestBytes, err := json.Marshal(&manifestCopy)
	if err != nil {
		panic(err)
	}

	if err := os.MkdirAll(filepath.Join(pluginDir, manifest.Id), 0700); err != nil {
		panic(err)
	}

	if err := ioutil.WriteFile(filepath.Join(pluginDir, manifest.Id, "plugin.json"), manifestBytes, 0600); err != nil {
		panic(err)
	}
}