// Copyright 2019 The Knative 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 im
// See the License for the specific language governing permissions and
// limitations under the License.

// +build e2e

package e2e

import (
	"fmt"
	"strconv"
	"strings"
	"testing"

	"github.com/knative/client/pkg/util"
	"gotest.tools/assert"
)

func TestRevision(t *testing.T) {
	t.Parallel()
	test := NewE2eTest(t)
	test.Setup(t)
	defer test.Teardown(t)

	t.Run("create hello service and return no error", func(t *testing.T) {
		test.serviceCreate(t, "hello")
	})

	t.Run("describe revision from hello service with print flags", func(t *testing.T) {
		test.revisionDescribeWithPrintFlags(t, "hello")
	})

	t.Run("update hello service and increase the count of configuration generation", func(t *testing.T) {
		test.serviceUpdate(t, "hello", []string{"--env", "TARGET=kn", "--port", "8888"})
	})

	t.Run("show a list of revisions sorted by the count of configuration generation", func(t *testing.T) {
		test.revisionListWithService(t, "hello")
	})

	t.Run("delete latest revision from hello service and return no error", func(t *testing.T) {
		test.revisionDelete(t, "hello")
	})

	t.Run("delete hello service and return no error", func(t *testing.T) {
		test.serviceDelete(t, "hello")
	})
}

func (test *e2eTest) revisionListWithService(t *testing.T, serviceNames ...string) {
	for _, svcName := range serviceNames {
		confGen := test.findConfigurationGeneration(t, svcName)

		out, err := test.kn.RunWithOpts([]string{"revision", "list", "-s", svcName}, runOpts{})
		assert.NilError(t, err)

		outputLines := strings.Split(out, "\n")
		// Ignore the last line because it is an empty string caused by splitting a line break
		// at the end of the output string
		for _, line := range outputLines[1 : len(outputLines)-1] {
			revName := test.findRevisionByGeneration(t, svcName, confGen)
			assert.Check(t, util.ContainsAll(line, revName, svcName, strconv.Itoa(confGen)))
			confGen--
		}
	}
}

func (test *e2eTest) revisionDelete(t *testing.T, serviceName string) {
	revName := test.findRevision(t, serviceName)

	out, err := test.kn.RunWithOpts([]string{"revision", "delete", revName}, runOpts{})
	assert.NilError(t, err)

	assert.Check(t, util.ContainsAll(out, "Revision", revName, "deleted", "namespace", test.kn.namespace))
}

func (test *e2eTest) revisionDescribeWithPrintFlags(t *testing.T, serviceName string) {
	revName := test.findRevision(t, serviceName)

	out, err := test.kn.RunWithOpts([]string{"revision", "describe", revName, "-o=name"}, runOpts{})
	assert.NilError(t, err)

	expectedName := fmt.Sprintf("revision.serving.knative.dev/%s", revName)
	assert.Equal(t, strings.TrimSpace(out), expectedName)
}

func (test *e2eTest) findRevision(t *testing.T, serviceName string) string {
	revName, err := test.kn.RunWithOpts([]string{"revision", "list", "-s", serviceName, "-o=jsonpath={.items[0].metadata.name}"}, runOpts{})
	assert.NilError(t, err)
	if strings.Contains(revName, "No resources found.") {
		t.Errorf("Could not find revision name.")
	}
	return revName
}

func (test *e2eTest) findRevisionByGeneration(t *testing.T, serviceName string, generation int) string {
	maxGen := test.findConfigurationGeneration(t, serviceName)
	revName, err := test.kn.RunWithOpts([]string{"revision", "list", "-s", serviceName,
		fmt.Sprintf("-o=jsonpath={.items[%d].metadata.name}", maxGen-generation)}, runOpts{})
	assert.NilError(t, err)
	if strings.Contains(revName, "No resources found.") {
		t.Errorf("Could not find revision name.")
	}
	return revName
}

func (test *e2eTest) findConfigurationGeneration(t *testing.T, serviceName string) int {
	confGenStr, err := test.kn.RunWithOpts([]string{"revision", "list", "-s", serviceName, "-o=jsonpath={.items[0].metadata.labels.serving\\.knative\\.dev/configurationGeneration}"}, runOpts{})
	assert.NilError(t, err)
	if confGenStr == "" {
		t.Errorf("Could not find configuration generation.")
	}
	confGen, err := strconv.Atoi(confGenStr)
	if err != nil {
		t.Errorf("Invalid type of configuration generation: %s", err)
	}

	return confGen
}