/*
Copyright 2019 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 kubectl

import (
	"strings"

	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	clientset "k8s.io/client-go/kubernetes"
	"k8s.io/kubernetes/test/e2e/framework"
	e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
	testutils "k8s.io/kubernetes/test/utils"
)

// LogFailedContainers runs `kubectl logs` on a failed containers.
func LogFailedContainers(c clientset.Interface, ns string, logFunc func(ftm string, args ...interface{})) {
	podList, err := c.CoreV1().Pods(ns).List(metav1.ListOptions{})
	if err != nil {
		logFunc("Error getting pods in namespace '%s': %v", ns, err)
		return
	}
	logFunc("Running kubectl logs on non-ready containers in %v", ns)
	for _, pod := range podList.Items {
		if res, err := testutils.PodRunningReady(&pod); !res || err != nil {
			kubectlLogPod(c, pod, "", framework.Logf)
		}
	}
}

func kubectlLogPod(c clientset.Interface, pod v1.Pod, containerNameSubstr string, logFunc func(ftm string, args ...interface{})) {
	for _, container := range pod.Spec.Containers {
		if strings.Contains(container.Name, containerNameSubstr) {
			// Contains() matches all strings if substr is empty
			logs, err := e2epod.GetPodLogs(c, pod.Namespace, pod.Name, container.Name)
			if err != nil {
				logs, err = e2epod.GetPreviousPodLogs(c, pod.Namespace, pod.Name, container.Name)
				if err != nil {
					logFunc("Failed to get logs of pod %v, container %v, err: %v", pod.Name, container.Name, err)
				}
			}
			logFunc("Logs of %v/%v:%v on node %v", pod.Namespace, pod.Name, container.Name, pod.Spec.NodeName)
			logFunc("%s : STARTLOG\n%s\nENDLOG for container %v:%v:%v", containerNameSubstr, logs, pod.Namespace, pod.Name, container.Name)
		}
	}
}