/*
Copyright 2014 Google Inc. All rights reserved.

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 registrytest

import (
	"sync"

	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
)

type PodRegistry struct {
	Err  error
	Pod  *api.Pod
	Pods []api.Pod
	sync.Mutex

	mux *watch.Mux
}

func NewPodRegistry(pods []api.Pod) *PodRegistry {
	return &PodRegistry{
		Pods: pods,
		mux:  watch.NewMux(0),
	}
}

func (r *PodRegistry) ListPods(selector labels.Selector) ([]api.Pod, error) {
	r.Lock()
	defer r.Unlock()
	if r.Err != nil {
		return r.Pods, r.Err
	}
	var filtered []api.Pod
	for _, pod := range r.Pods {
		if selector.Matches(labels.Set(pod.Labels)) {
			filtered = append(filtered, pod)
		}
	}
	return filtered, nil
}

func (r *PodRegistry) WatchPods(resourceVersion uint64, filter func(*api.Pod) bool) (watch.Interface, error) {
	// TODO: wire filter down into the mux; it needs access to current and previous state :(
	return r.mux.Watch(), nil
}

func (r *PodRegistry) GetPod(podId string) (*api.Pod, error) {
	r.Lock()
	defer r.Unlock()
	return r.Pod, r.Err
}

func (r *PodRegistry) CreatePod(pod api.Pod) error {
	r.Lock()
	defer r.Unlock()
	r.Pod = &pod
	r.mux.Action(watch.Added, &pod)
	return r.Err
}

func (r *PodRegistry) UpdatePod(pod api.Pod) error {
	r.Lock()
	defer r.Unlock()
	r.Pod = &pod
	r.mux.Action(watch.Modified, &pod)
	return r.Err
}

func (r *PodRegistry) DeletePod(podId string) error {
	r.Lock()
	defer r.Unlock()
	r.mux.Action(watch.Deleted, r.Pod)
	return r.Err
}