package apps

import (
	"fmt"
	"os"
	"os/exec"
	"path"
	"strings"
	"testing"

	"github.com/rosti-cz/node-api/apps/drivers"
	"github.com/stretchr/testify/assert"
)

var snapshotProcessor *SnapshotProcessor

var initialPwd string
var testS3Endpoint string

func TestMain(m *testing.M) {
	testS3Endpoint = "localhost:9000"
	if os.Getenv("TEST_S3_ENDPOINT") != "" {
		testS3Endpoint = os.Getenv("TEST_S3_ENDPOINT")
	}

	pwd, err := os.Getwd()
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}

	toRemovePath := path.Join(pwd, "..", "tmp")
	initialPwd = path.Join(pwd, "..")

	// Removing temporary test files from previous runs
	err = os.RemoveAll(toRemovePath)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}

	minioHost := os.Getenv("MINIO_HOST")
	if minioHost == "" {
		minioHost = "localhost:9000"
	}

	snapshotProcessor = &SnapshotProcessor{
		AppsPath:        path.Join(initialPwd, "tmp/apps"),
		TmpSnapshotPath: path.Join(initialPwd, "tmp/snapshots"),

		Driver: drivers.S3Driver{
			S3AccessKey: "test",
			S3SecretKey: "testtest",
			S3Endpoint:  testS3Endpoint,
			S3SSL:       false,
			Bucket:      "testsnapshots",
		},
	}

	err = os.MkdirAll(path.Join(initialPwd, "tmp/apps"), 0755)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}

	err = os.MkdirAll(path.Join(initialPwd, "tmp/snapshots"), 0755)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}

	code := m.Run()

	os.Exit(code)
}

func TestSnapshot(t *testing.T) {
	snapshot := Snapshot{
		AppName:   "app_0102",
		TimeStamp: 1634510035,
		Labels:    []string{"userid:1"},
	}

	assert.Equal(t, "app_0102:1634510035:eyJhcHBfbmFtZSI6ImFwcF8wMTAyIiwidHMiOjE2MzQ1MTAwMzUsImxhYmVscyI6WyJ1c2VyaWQ6MSJdfQ==", snapshot.KeyName())

	snapshot2, err := DecodeKeyName("app_0102:1634510035:eyJhcHBfbmFtZSI6ImFwcF8wMTAyIiwidHMiOjE2MzQ1MTAwMzUsImxhYmVscyI6WyJ1c2VyaWQ6MSJdfQ==")
	assert.Nil(t, err)
	assert.Equal(t, "app_0102", snapshot2.AppName)
	assert.Equal(t, int64(1634510035), snapshot2.TimeStamp)
	assert.Equal(t, "userid:1", snapshot2.Labels[0])
}

func TestCreateRestoreListSnapshot(t *testing.T) {
	appName := "app_0101"

	// Create an app structure
	err := os.MkdirAll(path.Join(snapshotProcessor.AppsPath, appName), 0755)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}

	_, err = exec.Command("bash", "-c", "echo content > "+path.Join(snapshotProcessor.AppsPath, appName)+"/a_file.txt").CombinedOutput()
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}

	// Create an snapshot
	snapshotName, err := snapshotProcessor.CreateSnapshot(appName, []string{"app:test", "almost_no_content"})
	assert.Nil(t, err)
	assert.Equal(t, strings.HasPrefix(snapshotName, appName+":"), true)

	// Remove app
	err = os.RemoveAll(path.Join(snapshotProcessor.AppsPath, appName))
	assert.Nil(t, err)

	// Check if the file doesn't exist
	_, err = os.Stat(path.Join(snapshotProcessor.AppsPath, appName, "a_file.txt"))
	assert.Equal(t, os.IsNotExist(err), true)

	// list snapshots
	snapshots, err := snapshotProcessor.ListAppSnapshots(appName)
	assert.Nil(t, err)

	assert.True(t, len(snapshots) >= 1, true, "not snapshots found")
	var found bool
	for _, snapshot := range snapshots {
		if snapshot.AppName == appName {
			found = true
		}
	}
	assert.True(t, found, "not the right snapshot found")

	// List snapshots for list of apps
	snapshots, err = snapshotProcessor.ListAppsSnapshots([]string{appName})
	assert.Nil(t, err)

	assert.True(t, len(snapshots) >= 1, true, "not snapshots found")
	found = false
	for _, snapshot := range snapshots {
		if snapshot.AppName == appName {
			found = true
		}
	}
	assert.True(t, found, "not the right snapshot found")

	// Restore snapshot
	err = snapshotProcessor.RestoreSnapshot(snapshotName, appName)
	assert.Nil(t, err)

	_, err = os.Stat(path.Join(snapshotProcessor.AppsPath, appName, "a_file.txt"))
	assert.Equal(t, os.IsNotExist(err), false)

}

func TestGetSnapshot(t *testing.T) {
	snapshot, err := snapshotProcessor.GetSnapshot("app_0102:1634510035:eyJhcHBfbmFtZSI6ImFwcF8wMTAyIiwidHMiOjE2MzQ1MTAwMzUsImxhYmVscyI6WyJ1c2VyaWQ6MSJdfQ==")
	assert.Nil(t, err)
	assert.Equal(t, "app_0102", snapshot.AppName)
}

func TestListAppsSnapshotsByLabel(t *testing.T) {
	appName := "app_0102"

	// Create an app structure
	err := os.MkdirAll(path.Join(snapshotProcessor.AppsPath, appName), 0755)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}

	_, err = exec.Command("bash", "-c", "echo content > "+path.Join(snapshotProcessor.AppsPath, appName)+"/a_file.txt").CombinedOutput()
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}

	// Create an snapshot
	snapshotName, err := snapshotProcessor.CreateSnapshot(appName, []string{"app:test2", "almost_no_content"})
	assert.Nil(t, err)
	assert.Equal(t, strings.HasPrefix(snapshotName, appName+":"), true)

	snapshots, err := snapshotProcessor.ListAppsSnapshotsByLabel("app:test2")
	assert.Nil(t, err)
	assert.True(t, len(snapshots) > 0)

	assert.Equal(t, appName, snapshots[0].AppName)
}