// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements.  See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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
//
//     http://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 ingress

import (
	"encoding/json"
	"fmt"
	"net/http"
	"time"

	"github.com/onsi/ginkgo"
	"github.com/stretchr/testify/assert"

	"github.com/apache/apisix-ingress-controller/test/e2e/scaffold"
)

type ip struct {
	IP string `json:"ip"`
}

var _ = ginkgo.Describe("single-route", func() {
	opts := &scaffold.Options{
		Name:                  "default",
		Kubeconfig:            scaffold.GetKubeconfig(),
		APISIXConfigPath:      "testdata/apisix-gw-config.yaml",
		IngressAPISIXReplicas: 1,
		HTTPBinServicePort:    80,
		APISIXRouteVersion:    "apisix.apache.org/v2alpha1",
	}
	s := scaffold.NewScaffold(opts)
	ginkgo.It("/ip should return your ip", func() {
		backendSvc, backendSvcPort := s.DefaultHTTPBackend()
		ar := fmt.Sprintf(`
apiVersion: apisix.apache.org/v2alpha1
kind: ApisixRoute
metadata:
  name: httpbin-route
spec:
  http:
  - name: rule1
    match:
      paths:
      - /ip
    backend:
      serviceName: %s
      servicePort: %d
`, backendSvc, backendSvcPort[0])
		assert.Nil(ginkgo.GinkgoT(), s.CreateResourceFromString(ar))
		err := s.EnsureNumApisixRoutesCreated(1)
		assert.Nil(ginkgo.GinkgoT(), err, "checking number of routes")
		err = s.EnsureNumApisixUpstreamsCreated(1)
		assert.Nil(ginkgo.GinkgoT(), err, "checking number of upstreams")

		// TODO When ingress controller can feedback the lifecycle of CRDs to the
		// status field, we can poll it rather than sleeping.
		time.Sleep(3 * time.Second)

		body := s.NewAPISIXClient().GET("/ip").WithHeader("Host", "httpbin.com").Expect().Status(http.StatusOK).Body().Raw()
		var placeholder ip
		err = json.Unmarshal([]byte(body), &placeholder)
		assert.Nil(ginkgo.GinkgoT(), err, "unmarshalling IP")
		// It's not our focus point to check the IP address returned by httpbin,
		// so here skip the IP address validation.
	})
})

var _ = ginkgo.Describe("double-routes", func() {
	opts := &scaffold.Options{
		Name:                  "default",
		Kubeconfig:            scaffold.GetKubeconfig(),
		APISIXConfigPath:      "testdata/apisix-gw-config.yaml",
		IngressAPISIXReplicas: 1,
		HTTPBinServicePort:    80,
		APISIXRouteVersion:    "apisix.apache.org/v2alpha1",
	}
	s := scaffold.NewScaffold(opts)
	ginkgo.It("double routes work independently", func() {
		backendSvc, backendSvcPort := s.DefaultHTTPBackend()
		ar := `
apiVersion: apisix.apache.org/v2alpha1
kind: ApisixRoute
metadata:
  name: httpbin-route
spec:
  http:
  - name: rule1
    match:
      paths:
      - /ip
    backend:
      serviceName: %s
      servicePort: %d
  - name: rule2
    match:
      paths:
      - /json
    backend:
      serviceName: %s
      servicePort: %d
`
		ar = fmt.Sprintf(ar, backendSvc, backendSvcPort[0], backendSvc, backendSvcPort[0])
		assert.Nil(ginkgo.GinkgoT(), s.CreateResourceFromString(ar))

		err := s.EnsureNumApisixRoutesCreated(2)
		assert.Nil(ginkgo.GinkgoT(), err, "checking number of routes")
		err = s.EnsureNumApisixUpstreamsCreated(1)
		assert.Nil(ginkgo.GinkgoT(), err, "checking number of upstreams")
		// TODO When ingress controller can feedback the lifecycle of CRDs to the
		// status field, we can poll it rather than sleeping.
		time.Sleep(3 * time.Second)
		body := s.NewAPISIXClient().GET("/ip").WithHeader("Host", "httpbin.com").Expect().Status(http.StatusOK).Body().Raw()
		var placeholder ip
		err = json.Unmarshal([]byte(body), &placeholder)
		assert.Nil(ginkgo.GinkgoT(), err, "unmarshalling IP")

		body = s.NewAPISIXClient().GET("/json").WithHeader("Host", "httpbin.com").Expect().Status(http.StatusOK).Body().Raw()
		var dummy map[string]interface{}
		err = json.Unmarshal([]byte(body), &dummy)
		assert.Nil(ginkgo.GinkgoT(), err, "unmarshalling json")
		// We don't care the json data, only make sure it's a normal json string.
	})
})

var _ = ginkgo.Describe("leader election", func() {
	s := scaffold.NewScaffold(&scaffold.Options{
		Name:                  "leaderelection",
		Kubeconfig:            scaffold.GetKubeconfig(),
		APISIXConfigPath:      "testdata/apisix-gw-config.yaml",
		IngressAPISIXReplicas: 2,
	})
	ginkgo.It("lease check", func() {
		pods, err := s.GetIngressPodDetails()
		assert.Nil(ginkgo.GinkgoT(), err)
		assert.Len(ginkgo.GinkgoT(), pods, 2)
		lease, err := s.WaitGetLeaderLease()
		assert.Nil(ginkgo.GinkgoT(), err)
		assert.Equal(ginkgo.GinkgoT(), *lease.Spec.LeaseDurationSeconds, int32(15))
		if *lease.Spec.HolderIdentity != pods[0].Name && *lease.Spec.HolderIdentity != pods[1].Name {
			assert.Fail(ginkgo.GinkgoT(), "bad leader lease holder identity")
		}
	})

	ginkgo.It("leader failover", func() {
		pods, err := s.GetIngressPodDetails()
		assert.Nil(ginkgo.GinkgoT(), err)
		assert.Len(ginkgo.GinkgoT(), pods, 2)

		lease, err := s.WaitGetLeaderLease()
		assert.Nil(ginkgo.GinkgoT(), err)

		leaderIdx := 0
		if *lease.Spec.HolderIdentity == pods[1].Name {
			leaderIdx = 1
		}
		ginkgo.GinkgoT().Logf("lease is %s", *lease.Spec.HolderIdentity)
		assert.Nil(ginkgo.GinkgoT(), s.KillPod(pods[leaderIdx].Name))

		// Wait the old lease expire and new leader was elected.
		time.Sleep(25 * time.Second)

		newLease, err := s.WaitGetLeaderLease()
		assert.Nil(ginkgo.GinkgoT(), err)

		newPods, err := s.GetIngressPodDetails()
		assert.Nil(ginkgo.GinkgoT(), err)
		assert.Len(ginkgo.GinkgoT(), pods, 2)

		assert.NotEqual(ginkgo.GinkgoT(), *newLease.Spec.HolderIdentity, *lease.Spec.HolderIdentity)
		assert.Greater(ginkgo.GinkgoT(), *newLease.Spec.LeaseTransitions, *lease.Spec.LeaseTransitions)

		if *newLease.Spec.HolderIdentity != newPods[0].Name && *newLease.Spec.HolderIdentity != newPods[1].Name {
			assert.Failf(ginkgo.GinkgoT(), "bad leader lease holder identity: %s, should be %s or %s",
				*newLease.Spec.HolderIdentity, newPods[0].Name, newPods[1].Name)
		}
	})
})