/*
   Copyright 2014 CoreOS, Inc.

   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 configdrive

import (
	"os"
	"testing"
)

type mockFilesystem []string

func (m mockFilesystem) readFile(filename string) ([]byte, error) {
	for _, file := range m {
		if file == filename {
			return []byte(filename), nil
		}
	}
	return nil, os.ErrNotExist
}

func TestFetchMetadata(t *testing.T) {
	for _, tt := range []struct {
		root     string
		filename string
		files    mockFilesystem
	}{
		{
			"/",
			"",
			mockFilesystem{},
		},
		{
			"/",
			"/openstack/latest/meta_data.json",
			mockFilesystem([]string{"/openstack/latest/meta_data.json"}),
		},
		{
			"/media/configdrive",
			"/media/configdrive/openstack/latest/meta_data.json",
			mockFilesystem([]string{"/media/configdrive/openstack/latest/meta_data.json"}),
		},
	} {
		cd := configDrive{tt.root, tt.files.readFile}
		filename, err := cd.FetchMetadata()
		if err != nil {
			t.Fatalf("bad error for %q: want %q, got %q", tt, nil, err)
		}
		if string(filename) != tt.filename {
			t.Fatalf("bad path for %q: want %q, got %q", tt, tt.filename, filename)
		}
	}
}

func TestFetchUserdata(t *testing.T) {
	for _, tt := range []struct {
		root     string
		filename string
		files    mockFilesystem
	}{
		{
			"/",
			"",
			mockFilesystem{},
		},
		{
			"/",
			"/openstack/latest/user_data",
			mockFilesystem([]string{"/openstack/latest/user_data"}),
		},
		{
			"/media/configdrive",
			"/media/configdrive/openstack/latest/user_data",
			mockFilesystem([]string{"/media/configdrive/openstack/latest/user_data"}),
		},
	} {
		cd := configDrive{tt.root, tt.files.readFile}
		filename, err := cd.FetchUserdata()
		if err != nil {
			t.Fatalf("bad error for %q: want %q, got %q", tt, nil, err)
		}
		if string(filename) != tt.filename {
			t.Fatalf("bad path for %q: want %q, got %q", tt, tt.filename, filename)
		}
	}
}

func TestConfigRoot(t *testing.T) {
	for _, tt := range []struct {
		root       string
		configRoot string
	}{
		{
			"/",
			"/openstack",
		},
		{
			"/media/configdrive",
			"/media/configdrive/openstack",
		},
	} {
		cd := configDrive{tt.root, nil}
		if configRoot := cd.ConfigRoot(); configRoot != tt.configRoot {
			t.Fatalf("bad config root for %q: want %q, got %q", tt, tt.configRoot, configRoot)
		}
	}
}

func TestNewDatasource(t *testing.T) {
	for _, tt := range []struct {
		root       string
		expectRoot string
	}{
		{
			root:       "",
			expectRoot: "",
		},
		{
			root:       "/media/configdrive",
			expectRoot: "/media/configdrive",
		},
	} {
		service := NewDatasource(tt.root)
		if service.root != tt.expectRoot {
			t.Fatalf("bad root (%q): want %q, got %q", tt.root, tt.expectRoot, service.root)
		}
	}
}