/*
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 install

import (
	"context"
	"fmt"
	"reflect"

	"k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"

	console "github.com/openshift/api/console/v1"

	"github.com/apache/camel-k/pkg/client"
	"github.com/apache/camel-k/pkg/util/defaults"

	"github.com/Masterminds/semver"
)

const (
	kamelCliDownloadName   = "kamel-cli"
	kamelVersionAnnotation = "camel.apache.org/version"
)

func installOpenShiftConsoleDownloadLink(ctx context.Context, c client.Client) error {
	// Check the ConsoleCLIDownload CRD is present, which should be starting OpenShift version 4.2.
	// That check is also enough to exclude Kubernetes clusters.
	ok, err := isAPIResourceInstalled(c, "console.openshift.io/v1", reflect.TypeOf(console.ConsoleCLIDownload{}).Name())
	if err != nil {
		return err
	} else if !ok {
		return nil
	}

	// Check for an existing ConsoleCLIDownload resource
	existing := &console.ConsoleCLIDownload{}
	err = c.Get(ctx, types.NamespacedName{Name: kamelCliDownloadName}, existing)
	if err != nil {
		if errors.IsNotFound(err) {
			existing = nil
		} else {
			return err
		}
	}

	if existing != nil {
		if version, ok := existing.Annotations[kamelVersionAnnotation]; ok {
			current, err := semver.NewVersion(version)
			if err != nil {
				return err
			}
			this, err := semver.NewVersion(defaults.Version)
			if err != nil {
				return err
			}
			if this.LessThan(current) {
				// Keep the most recent version
				return nil
			}
			// Else delete the older version
			err = c.Delete(ctx, existing)
			if err != nil {
				return err
			}
		}
	}

	// Create the ConsoleCLIDownload for Kamel CLI
	link := console.ConsoleCLIDownload{
		ObjectMeta: metav1.ObjectMeta{
			Annotations: map[string]string{
				kamelVersionAnnotation: defaults.Version,
			},
			Name: kamelCliDownloadName,
		},
		Spec: console.ConsoleCLIDownloadSpec{
			DisplayName: "kamel - Apache Camel K Command Line Interface",
			Description: "Apache Camel K is a lightweight integration platform, born on Kubernetes, with serverless superpowers.\n\n" +
				"The `kamel` binary can be used to both configure the cluster and run integrations. " +
				"Once you've downloaded the `kamel` binary, log into the cluster using the `oc` client tool and start using the `kamel` CLI.\n\n" +
				"You can run `kamel help` to list the available commands or go to the [Camel K Website](https://camel.apache.org/projects/camel-k/) for more information.",
			Links: []console.Link{
				{
					Text: "Download the kamel binary for Linux",
					Href: fmt.Sprintf("https://github.com/apache/camel-k/releases/download/%s/camel-k-client-%s-linux-64bit.tar.gz", defaults.Version, defaults.Version),
				},
				{
					Text: "Download the kamel binary for Mac",
					Href: fmt.Sprintf("https://github.com/apache/camel-k/releases/download/%s/camel-k-client-%s-mac-64bit.tar.gz", defaults.Version, defaults.Version),
				},
				{
					Text: "Download the kamel binary for Windows",
					Href: fmt.Sprintf("https://github.com/apache/camel-k/releases/download/%s/camel-k-client-%s-windows-64bit.tar.gz", defaults.Version, defaults.Version),
				},
			},
		},
	}

	err = c.Create(ctx, &link)
	if err != nil {
		return err
	}

	return nil
}

func isAPIResourceInstalled(c client.Client, groupVersion string, kind string) (bool, error) {
	resources, err := c.Discovery().ServerResourcesForGroupVersion(groupVersion)
	if err != nil {
		if errors.IsNotFound(err) {
			return false, nil
		}
		return false, err
	}

	for _, resource := range resources.APIResources {
		if resource.Kind == kind {
			return true, nil
		}
	}

	return false, nil
}