/*
Copyright 2021 The Kubernetes 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 upgrades

import (
	"encoding/xml"
	"fmt"
	"os"
	"path/filepath"
	"regexp"
	"strings"
	"sync"
	"time"

	"k8s.io/kubernetes/test/e2e/chaosmonkey"
	"k8s.io/kubernetes/test/e2e/framework"
	e2eginkgowrapper "k8s.io/kubernetes/test/e2e/framework/ginkgowrapper"
	e2eskipper "k8s.io/kubernetes/test/e2e/framework/skipper"
	"k8s.io/kubernetes/test/utils/junit"

	"github.com/onsi/ginkgo"
)

type chaosMonkeyAdapter struct {
	test        Test
	testReport  *junit.TestCase
	framework   *framework.Framework
	upgradeType UpgradeType
	upgCtx      UpgradeContext
}

func (cma *chaosMonkeyAdapter) Test(sem *chaosmonkey.Semaphore) {
	start := time.Now()
	var once sync.Once
	ready := func() {
		once.Do(func() {
			sem.Ready()
		})
	}
	defer FinalizeUpgradeTest(start, cma.testReport)
	defer ready()
	if skippable, ok := cma.test.(Skippable); ok && skippable.Skip(cma.upgCtx) {
		ginkgo.By("skipping test " + cma.test.Name())
		cma.testReport.Skipped = "skipping test " + cma.test.Name()
		return
	}

	defer cma.test.Teardown(cma.framework)
	cma.test.Setup(cma.framework)
	ready()
	cma.test.Test(cma.framework, sem.StopCh, cma.upgradeType)
}

// FinalizeUpgradeTest fills the necessary information about junit.TestCase.
func FinalizeUpgradeTest(start time.Time, tc *junit.TestCase) {
	tc.Time = time.Since(start).Seconds()
	r := recover()
	if r == nil {
		return
	}

	switch r := r.(type) {
	case e2eginkgowrapper.FailurePanic:
		tc.Failures = []*junit.Failure{
			{
				Message: r.Message,
				Type:    "Failure",
				Value:   fmt.Sprintf("%s\n\n%s", r.Message, r.FullStackTrace),
			},
		}
	case e2eskipper.SkipPanic:
		tc.Skipped = fmt.Sprintf("%s:%d %q", r.Filename, r.Line, r.Message)
	default:
		tc.Errors = []*junit.Error{
			{
				Message: fmt.Sprintf("%v", r),
				Type:    "Panic",
				Value:   fmt.Sprintf("%v", r),
			},
		}
	}
}

func createUpgradeFrameworks(tests []Test) map[string]*framework.Framework {
	nsFilter := regexp.MustCompile("[^[:word:]-]+") // match anything that's not a word character or hyphen
	testFrameworks := map[string]*framework.Framework{}
	for _, t := range tests {
		ns := nsFilter.ReplaceAllString(t.Name(), "-") // and replace with a single hyphen
		ns = strings.Trim(ns, "-")
		testFrameworks[t.Name()] = framework.NewDefaultFramework(ns)
	}
	return testFrameworks
}

// RunUpgradeSuite runs the actual upgrade tests.
func RunUpgradeSuite(
	upgCtx *UpgradeContext,
	tests []Test,
	testSuite *junit.TestSuite,
	upgradeType UpgradeType,
	upgradeFunc func(),
) {
	testFrameworks := createUpgradeFrameworks(tests)

	cm := chaosmonkey.New(upgradeFunc)
	for _, t := range tests {
		testCase := &junit.TestCase{
			Name:      t.Name(),
			Classname: "upgrade_tests",
		}
		testSuite.TestCases = append(testSuite.TestCases, testCase)
		cma := chaosMonkeyAdapter{
			test:        t,
			testReport:  testCase,
			framework:   testFrameworks[t.Name()],
			upgradeType: upgradeType,
			upgCtx:      *upgCtx,
		}
		cm.Register(cma.Test)
	}

	start := time.Now()
	defer func() {
		testSuite.Update()
		testSuite.Time = time.Since(start).Seconds()
		if framework.TestContext.ReportDir != "" {
			fname := filepath.Join(framework.TestContext.ReportDir, fmt.Sprintf("junit_%supgrades.xml", framework.TestContext.ReportPrefix))
			f, err := os.Create(fname)
			if err != nil {
				return
			}
			defer f.Close()
			xml.NewEncoder(f).Encode(testSuite)
		}
	}()
	cm.Do()
}