/*
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 main

import (
	"context"
	"fmt"

	"github.com/fluxcd/flux2/internal/utils"
	"github.com/fluxcd/pkg/apis/meta"

	"github.com/spf13/cobra"
	apimeta "k8s.io/apimachinery/pkg/api/meta"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/apimachinery/pkg/util/wait"
	"sigs.k8s.io/controller-runtime/pkg/client"

	imagev1 "github.com/fluxcd/image-reflector-controller/api/v1alpha1"
)

var resumeImageRepositoryCmd = &cobra.Command{
	Use:   "image-repository [name]",
	Short: "Resume a suspended ImageRepository",
	Long:  `The resume command marks a previously suspended ImageRepository resource for reconciliation and waits for it to finish.`,
	Example: `  # Resume reconciliation for an existing ImageRepository
  flux resume auto image-repository alpine
`,
	RunE: resumeImageRepositoryRun,
}

func init() {
	resumeAutoCmd.AddCommand(resumeImageRepositoryCmd)
}

func resumeImageRepositoryRun(cmd *cobra.Command, args []string) error {
	if len(args) < 1 {
		return fmt.Errorf("source name is required")
	}
	name := args[0]

	ctx, cancel := context.WithTimeout(context.Background(), timeout)
	defer cancel()

	kubeClient, err := utils.KubeClient(kubeconfig, kubecontext)
	if err != nil {
		return err
	}

	namespacedName := types.NamespacedName{
		Namespace: namespace,
		Name:      name,
	}
	var repo imagev1.ImageRepository
	err = kubeClient.Get(ctx, namespacedName, &repo)
	if err != nil {
		return err
	}

	logger.Actionf("resuming image repository %s in %s namespace", name, namespace)
	repo.Spec.Suspend = false
	if err := kubeClient.Update(ctx, &repo); err != nil {
		return err
	}
	logger.Successf("image repository resumed")

	logger.Waitingf("waiting for ImageRepository reconciliation")
	if err := wait.PollImmediate(pollInterval, timeout,
		isImageRepositoryResumed(ctx, kubeClient, namespacedName, &repo)); err != nil {
		return err
	}
	logger.Successf("ImageRepository reconciliation completed")
	logger.Successf("scanned %d tags", repo.Status.LastScanResult.TagCount)
	return nil
}

func isImageRepositoryResumed(ctx context.Context, kubeClient client.Client,
	namespacedName types.NamespacedName, repo *imagev1.ImageRepository) wait.ConditionFunc {
	return func() (bool, error) {
		err := kubeClient.Get(ctx, namespacedName, repo)
		if err != nil {
			return false, err
		}

		// Confirm the state we are observing is for the current generation
		if repo.Generation != repo.Status.ObservedGeneration {
			return false, nil
		}

		if c := apimeta.FindStatusCondition(repo.Status.Conditions, meta.ReadyCondition); c != nil {
			switch c.Status {
			case metav1.ConditionTrue:
				return true, nil
			case metav1.ConditionFalse:
				return false, fmt.Errorf(c.Message)
			}
		}
		return false, nil
	}
}