/*
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 platform

import (
	"context"

	v1 "github.com/apache/camel-k/pkg/apis/camel/v1"
	"github.com/apache/camel-k/pkg/util/kubernetes"
	k8serrors "k8s.io/apimachinery/pkg/api/errors"
	k8sclient "sigs.k8s.io/controller-runtime/pkg/client"
)

const (
	// DefaultPlatformName is the standard name used for the integration platform
	DefaultPlatformName = "camel-k"
)

// GetOrLookupCurrent --
func GetOrLookupCurrent(ctx context.Context, c k8sclient.Reader, namespace string, name string) (*v1.IntegrationPlatform, error) {
	if name != "" {
		return Get(ctx, c, namespace, name)
	}

	return GetCurrentPlatform(ctx, c, namespace)
}

// GetOrLookupAny returns the named platform or any other platform in the namespace
func GetOrLookupAny(ctx context.Context, c k8sclient.Reader, namespace string, name string) (*v1.IntegrationPlatform, error) {
	if name != "" {
		return Get(ctx, c, namespace, name)
	}

	return getAnyPlatform(ctx, c, namespace, false)
}

// Get returns the currently installed platform
func Get(ctx context.Context, c k8sclient.Reader, namespace string, name string) (*v1.IntegrationPlatform, error) {
	return kubernetes.GetIntegrationPlatform(ctx, c, name, namespace)
}

// GetCurrentPlatform returns the currently installed platform
func GetCurrentPlatform(ctx context.Context, c k8sclient.Reader, namespace string) (*v1.IntegrationPlatform, error) {
	return getAnyPlatform(ctx, c, namespace, true)
}

// getAnyPlatform returns the currently installed platform or any platform existing in the namespace
func getAnyPlatform(ctx context.Context, c k8sclient.Reader, namespace string, active bool) (*v1.IntegrationPlatform, error) {
	lst, err := ListPlatforms(ctx, c, namespace)
	if err != nil {
		return nil, err
	}

	for _, platform := range lst.Items {
		platform := platform // pin
		if IsActive(&platform) {
			return &platform, nil
		}
	}

	if !active && len(lst.Items) > 0 {
		// does not require the platform to be active, just return one if present
		res := lst.Items[0]
		return &res, nil
	}

	return nil, k8serrors.NewNotFound(v1.Resource("IntegrationPlatform"), DefaultPlatformName)
}

// ListPlatforms returns all platforms installed in a given namespace (only one will be active)
func ListPlatforms(ctx context.Context, c k8sclient.Reader, namespace string) (*v1.IntegrationPlatformList, error) {
	lst := v1.NewIntegrationPlatformList()
	if err := c.List(ctx, &lst, k8sclient.InNamespace(namespace)); err != nil {
		return nil, err
	}
	return &lst, nil
}

// IsActive determines if the given platform is being used
func IsActive(p *v1.IntegrationPlatform) bool {
	return p.Status.Phase != "" && p.Status.Phase != v1.IntegrationPlatformPhaseDuplicate
}

// GetProfile returns the current profile of the platform (if present) or returns the default one for the cluster
func GetProfile(p *v1.IntegrationPlatform) v1.TraitProfile {
	if p.Status.Profile != "" {
		return p.Status.Profile
	}

	switch p.Status.Cluster {
	case v1.IntegrationPlatformClusterKubernetes:
		return v1.TraitProfileKubernetes
	case v1.IntegrationPlatformClusterOpenShift:
		return v1.TraitProfileOpenShift
	}
	return ""
}