package e2e

import (
	"fmt"
	"regexp"
	"strconv"
	"strings"
	"time"

	. "github.com/onsi/gomega" // nolint
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/kubernetes"
	"k8s.io/kubernetes/test/e2e/framework"
	e2elog "k8s.io/kubernetes/test/e2e/framework/log"
)

var (
	rookURL = "https://raw.githubusercontent.com/rook/rook/$version/cluster/examples/kubernetes/ceph"
)

var rookNS = "rook-ceph"

func formRookURL(version string) {
	rookURL = strings.Replace(rookURL, "$version", version, 1)
}

func getK8sClient() kubernetes.Interface {
	e2elog.Logf("Creating a kubernetes client")
	client, err := framework.LoadClientset()
	Expect(err).Should(BeNil())
	return client

}

func deployCommon() {
	commonPath := fmt.Sprintf("%s/%s", rookURL, "common.yaml")
	framework.RunKubectlOrDie("create", "-f", commonPath)
}

func createFileSystem(c kubernetes.Interface) {
	commonPath := fmt.Sprintf("%s/%s", rookURL, "filesystem-test.yaml")
	framework.RunKubectlOrDie("create", "-f", commonPath)
	opt := &metav1.ListOptions{
		LabelSelector: "app=rook-ceph-mds",
	}
	err := checkCephPods(rookNS, c, 1, deployTimeout, opt)
	Expect(err).Should(BeNil())
}

func createRBDPool() {
	commonPath := fmt.Sprintf("%s/%s", rookURL, "pool-test.yaml")
	framework.RunKubectlOrDie("create", "-f", commonPath)
}
func deleteFileSystem() {
	commonPath := fmt.Sprintf("%s/%s", rookURL, "filesystem-test.yaml")
	_, err := framework.RunKubectl("delete", "-f", commonPath)
	if err != nil {
		e2elog.Logf("failed to delete file-system %v", err)
	}
}

func deleteRBDPool() {
	commonPath := fmt.Sprintf("%s/%s", rookURL, "pool-test.yaml")
	_, err := framework.RunKubectl("delete", "-f", commonPath)
	if err != nil {
		e2elog.Logf("failed to delete pool %v", err)
	}
}

func deployOperator(c kubernetes.Interface) {
	opPath := fmt.Sprintf("%s/%s", rookURL, "operator.yaml")

	_, err := framework.RunKubectl("create", "-f", opPath)
	Expect(err).Should(BeNil())
	err = waitForDaemonSets("rook-discover", rookNS, c, deployTimeout)
	Expect(err).Should(BeNil())
	err = waitForDeploymentComplete("rook-ceph-operator", rookNS, c, deployTimeout)
	Expect(err).Should(BeNil())
}

func deployCluster(c kubernetes.Interface) {
	opPath := fmt.Sprintf("%s/%s", rookURL, "cluster-test.yaml")
	framework.RunKubectlOrDie("create", "-f", opPath)

	// After rook-ceph v1.1.0, flex driver is disabled. We don't need to wait for rook-ceph-agent.
	if !strings.EqualFold(RookVersion, "master") && isOlderRookVersionThan(RookVersion, "v1.1.1") {
		err := waitForDaemonSets("rook-ceph-agent", rookNS, c, deployTimeout)
		Expect(err).Should(BeNil())
	}

	opt := &metav1.ListOptions{
		LabelSelector: "app=rook-ceph-mon",
	}
	err := checkCephPods(rookNS, c, 1, deployTimeout, opt)
	Expect(err).Should(BeNil())
}

func isOlderRookVersionThan(targetVersion, compareToVersion string) bool {
	rv := extractRookVersion(targetVersion)
	cv := extractRookVersion(compareToVersion)

	for i := 0; i < 3; i++ {
		if rv[i] < cv[i] {
			return true
		} else if rv[i] > cv[i] {
			return false
		}
	}

	return false
}

// extract rook version that form is v1.3.2-beta
func extractRookVersion(versionString string) []int {
	reg := regexp.MustCompile(`^v(\d+).(\d+).(\d+)`)
	parsedVersionString := reg.FindStringSubmatch(versionString)
	Expect(len(parsedVersionString)).Should(BeNumerically(">=", 4))

	var version []int
	for i := 1; i < 4; i++ {
		j, err := strconv.Atoi(parsedVersionString[i])
		Expect(err).Should(BeNil())

		version = append(version, j)
	}

	return version
}

func deployToolBox(c kubernetes.Interface) {
	opPath := fmt.Sprintf("%s/%s", rookURL, "toolbox.yaml")
	framework.RunKubectlOrDie("create", "-f", opPath)
	opt := &metav1.ListOptions{
		LabelSelector: "app=rook-ceph-tools",
	}

	name := getPodName(rookNS, c, opt)
	err := waitForPodInRunningState(name, rookNS, c, deployTimeout)
	Expect(err).Should(BeNil())
	waitforToolBoX(name)
}

// this is a  workaround, as we are hitting "unable to get monitor info from DNS SRV with service name: ceph-mon"
func waitforToolBoX(name string) {
	cmd := []string{"logs", "-nrook-ceph", name}
	for i := 0; i < 20; i++ {
		resp, err := framework.RunKubectl(cmd...)
		if err != nil {
			e2elog.Logf("failed to get logs %v", err)
			continue
		}

		if !strings.Contains(resp, "=") {
			e2elog.Logf("malformed monitor configuration %+v", resp)
			time.Sleep(10 * time.Second)
			continue
		}

		if strings.TrimRight(resp[strings.LastIndex(resp, "=")+1:], "\n") != "" {
			break
		}
		e2elog.Logf("monitor list is empty in ceph.conf %v", resp)
		time.Sleep(10 * time.Second)
	}
}

func deployRook() {
	c := getK8sClient()
	deployCommon()
	deployOperator(c)
	deployCluster(c)
	deployToolBox(c)
}

func tearDownRook() {
	opPath := fmt.Sprintf("%s/%s", rookURL, "cluster-test.yaml")
	framework.Cleanup(opPath, rookNS, "app=rook-ceph-mon")
	opPath = fmt.Sprintf("%s/%s", rookURL, "toolbox.yaml")
	framework.Cleanup(opPath, rookNS, "app=rook-ceph-tools")

	opPath = fmt.Sprintf("%s/%s", rookURL, "operator.yaml")
	// TODO need to add selector for cleanup validation
	framework.Cleanup(opPath, rookNS)
	commonPath := fmt.Sprintf("%s/%s", rookURL, "common.yaml")
	_, err := framework.RunKubectl("delete", "-f", commonPath)
	if err != nil {
		e2elog.Logf("failed to delete rook common %v", err)
	}
}