/*
Copyright 2016 The Kubernetes Authors 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 environment

import (
	"bytes"
	"io"
	"testing"

	"k8s.io/helm/pkg/chartutil"
	"k8s.io/helm/pkg/proto/hapi/chart"
	"k8s.io/helm/pkg/proto/hapi/release"
)

type mockEngine struct {
	out map[string]string
}

func (e *mockEngine) Render(chrt *chart.Chart, v chartutil.Values) (map[string]string, error) {
	return e.out, nil
}

type mockReleaseStorage struct {
	rel *release.Release
}

func (r *mockReleaseStorage) Create(v *release.Release) error {
	r.rel = v
	return nil
}

func (r *mockReleaseStorage) Read(k string) (*release.Release, error) {
	return r.rel, nil
}

func (r *mockReleaseStorage) Update(v *release.Release) error {
	r.rel = v
	return nil
}

func (r *mockReleaseStorage) Delete(k string) (*release.Release, error) {
	return r.rel, nil
}

func (r *mockReleaseStorage) List() ([]*release.Release, error) {
	return []*release.Release{}, nil
}

func (r *mockReleaseStorage) Query(labels map[string]string) ([]*release.Release, error) {
	return []*release.Release{}, nil
}

func (r *mockReleaseStorage) History(n string) ([]*release.Release, error) {
	res := []*release.Release{}
	rel, err := r.Read(n)
	if err != nil {
		return res, err
	}
	res = append(res, rel)
	return res, nil
}

type mockKubeClient struct {
}

func (k *mockKubeClient) Create(ns string, r io.Reader) error {
	return nil
}
func (k *mockKubeClient) Delete(ns string, r io.Reader) error {
	return nil
}

var _ Engine = &mockEngine{}
var _ ReleaseStorage = &mockReleaseStorage{}
var _ KubeClient = &mockKubeClient{}
var _ KubeClient = &PrintingKubeClient{}

func TestEngine(t *testing.T) {
	eng := &mockEngine{out: map[string]string{"albatross": "test"}}

	env := New()
	env.EngineYard = EngineYard(map[string]Engine{"test": eng})

	if engine, ok := env.EngineYard.Get("test"); !ok {
		t.Errorf("failed to get engine from EngineYard")
	} else if out, err := engine.Render(&chart.Chart{}, map[string]interface{}{}); err != nil {
		t.Errorf("unexpected template error: %s", err)
	} else if out["albatross"] != "test" {
		t.Errorf("expected 'test', got %q", out["albatross"])
	}
}

func TestReleaseStorage(t *testing.T) {
	rs := &mockReleaseStorage{}
	env := New()
	env.Releases = rs

	release := &release.Release{Name: "mariner"}

	if err := env.Releases.Create(release); err != nil {
		t.Fatalf("failed to store release: %s", err)
	}

	if err := env.Releases.Update(release); err != nil {
		t.Fatalf("failed to update release: %s", err)
	}

	if v, err := env.Releases.Read("albatross"); err != nil {
		t.Errorf("Error fetching release: %s", err)
	} else if v.Name != "mariner" {
		t.Errorf("Expected mariner, got %q", v.Name)
	}

	if _, err := env.Releases.Delete("albatross"); err != nil {
		t.Fatalf("failed to delete release: %s", err)
	}
}

func TestKubeClient(t *testing.T) {
	kc := &mockKubeClient{}
	env := New()
	env.KubeClient = kc

	manifests := map[string]string{
		"foo": "name: value\n",
		"bar": "name: value\n",
	}

	b := bytes.NewBuffer(nil)
	for _, content := range manifests {
		b.WriteString("\n---\n")
		b.WriteString(content)
	}

	if err := env.KubeClient.Create("sharry-bobbins", b); err != nil {
		t.Errorf("Kubeclient failed: %s", err)
	}
}