/*
Copyright 2020 The Flux authors

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

    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 router

import (
	"context"
	"fmt"
	"testing"

	"github.com/stretchr/testify/assert"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

func TestSkipperRouter_Reconcile(t *testing.T) {
	assert := assert.New(t)
	mocks := newFixture(nil)

	for _, tt := range []struct {
		name    string
		mocks   func() fixture
		wantErr bool
	}{
		{
			"creating new canary ingress w/ default settings",
			func() fixture { return mocks },
			false,
		}, {
			"updating existing canary ingress",
			func() fixture {
				ti := newTestIngress()
				ti.Annotations["something"] = "changed"
				_, err := mocks.kubeClient.NetworkingV1().Ingresses("default").Update(
					context.TODO(), ti, metav1.UpdateOptions{})
				assert.NoError(err)
				return mocks
			},
			false,
		},
	} {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			mocks := tt.mocks()
			router := &SkipperRouter{
				kubeClient: mocks.kubeClient,
				logger:     mocks.logger,
			}
			assert.NoError(router.Reconcile(mocks.ingressCanary))
			canaryName := fmt.Sprintf("%s-canary", mocks.ingressCanary.Spec.IngressRef.Name)
			inCanary, err := router.kubeClient.NetworkingV1().Ingresses("default").Get(
				context.TODO(), canaryName, metav1.GetOptions{})
			assert.NoError(err)
			// test initialisation
			assert.JSONEq(`{ "podinfo-primary":  100, "podinfo-canary":  0 }`, inCanary.Annotations["zalando.org/backend-weights"])
			assert.Equal("podinfo-primary", inCanary.Spec.Rules[0].HTTP.Paths[0].Backend.Service.Name, "backend flipped over")
			assert.Equal("podinfo-canary", inCanary.Spec.Rules[0].HTTP.Paths[1].Backend.Service.Name, "backend flipped over")
			assert.Len(inCanary.Spec.Rules[0].HTTP.Paths, 2)
			inApex, err := router.kubeClient.NetworkingV1().Ingresses("default").Get(
				context.TODO(), mocks.ingressCanary.Spec.IngressRef.Name, metav1.GetOptions{})
			assert.NoError(err)
			assert.Equal(inCanary.Spec.Rules[0].HTTP.Paths[0].Backend.Service.Port.Number,
				inApex.Spec.Rules[0].HTTP.Paths[0].Backend.Service.Port.Number, "canary backend not cloned")
			assert.Equal(inCanary.Spec.Rules[0].HTTP.Paths[0].Backend.Service.Port.Number,
				inCanary.Spec.Rules[0].HTTP.Paths[1].Backend.Service.Port.Number, "canary backend not cloned")
		})
	}
}

func TestSkipperRouter_GetSetRoutes(t *testing.T) {
	assert := assert.New(t)
	mocks := newFixture(nil)

	router := &SkipperRouter{logger: mocks.logger, kubeClient: mocks.kubeClient}
	assert.NoError(router.Reconcile(mocks.ingressCanary))

	p, c, m, err := router.GetRoutes(mocks.ingressCanary)
	assert.NoError(err)
	assert.Equal(100, p)
	assert.Equal(0, c)
	assert.Equal(false, m)

	tests := []struct {
		name            string
		primary, canary int
	}{
		{name: "0%", primary: 100, canary: 0},
		{name: "10%", primary: 90, canary: 10},
		{name: "20%", primary: 80, canary: 20},
		{name: "30%", primary: 70, canary: 30},
		{name: "85%", primary: 15, canary: 85},
		{name: "100%", primary: 0, canary: 100},
	}
	for _, tt := range tests {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			assert.NoError(router.SetRoutes(mocks.ingressCanary, tt.primary, tt.canary, false))
			inCanary, err := router.kubeClient.NetworkingV1().Ingresses("default").Get(
				context.TODO(), fmt.Sprintf("%s-canary", mocks.ingressCanary.Spec.IngressRef.Name), metav1.GetOptions{})
			assert.NoError(err)
			assert.JSONEq(fmt.Sprintf(`{"podinfo-primary": %d,"podinfo-canary": %d}`, tt.primary, tt.canary),
				inCanary.Annotations["zalando.org/backend-weights"])
			p, c, m, err = router.GetRoutes(mocks.ingressCanary)
			assert.NoError(err)
			assert.Equal(tt.primary, p)
			assert.Equal(tt.canary, c)
			assert.Equal(false, m)
		})
	}

}

func Test_insertPredicate(t *testing.T) {
	tests := []struct {
		name   string
		raw    string
		insert string
		want   string
	}{
		{
			name:   "a few Predicates lined up",
			raw:    `Host(/^my-host-header\.example\.org$/) && Method("GET") && Path("/hello")`,
			insert: "Weight(100)",
			want:   `Weight(100) && Host(/^my-host-header\.example\.org$/) && Method("GET") && Path("/hello")`,
		},
		{
			name:   "adds Predicate if none is set",
			raw:    "",
			insert: "Weight(100)",
			want:   `Weight(100)`,
		},
		{
			name:   "removes duplicated Predicate Weight(100)",
			raw:    `Weight(100) && Host(/^my-host-header\.example\.org$/) && Method("GET") && Path("/hello")`,
			insert: "Weight(100)",
			want:   `Weight(100) && Host(/^my-host-header\.example\.org$/) && Method("GET") && Path("/hello")`,
		},
		{
			name:   "removes duplicated Predicate False() and reorders them",
			raw:    `Host(/^my-host-header\.example\.org$/) && Method("GET") && Path("/hello")&&False()`,
			insert: "False()",
			want:   `False() && Host(/^my-host-header\.example\.org$/) && Method("GET") && Path("/hello")`,
		},
		{
			name:   "removes conflicting Predicate False()",
			raw:    `Host(/^my-host-header\.example\.org$/) &&  False() && Method("GET") && Path("/hello")`,
			insert: "Weight(100)",
			want:   `Weight(100) && Host(/^my-host-header\.example\.org$/) && Method("GET") && Path("/hello")`,
		},
	}
	for _, tt := range tests {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			assert.Equal(t, tt.want, insertPredicate(tt.raw, tt.insert))
		})
	}
}