// Copyright 2021 Google LLC
//
// 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 fakes

import (
	"cloud.google.com/go/compute/metadata"
	"fmt"
	"testing"
)

// Tests that all metadata keys are parsed and applied correctly.
func TestMetadataKeysHandler(t *testing.T) {
	tests := []struct {
		// Name of the test case
		name string
		// Key:Value pairs present in metadata.
		metadata map[string]string
		// Expected metadataKeys to be returned
		expectedMetadataKeys []string
	}{
		{
			"NoMetadataKeys",
			map[string]string{},
			[]string{""},
		},
		{
			"UpdateStrategyPresent",
			map[string]string{"update-strategy": "update-strategy-1"},
			[]string{"update-strategy"},
		},
		{
			"TwoKeysPresent",
			map[string]string{"cos-update-strategy": "update-strategy-1",
				"google-logging-enabled": "true"},
			[]string{"cos-update-strategy", "google-logging-enabled"},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			fakeMetadata := NewMetadataServer()
			fakeMetadata.Metadata = test.metadata
			defer fakeMetadata.Server.Close()
			if res, _ := metadata.InstanceAttributes(); len(res) != len(test.expectedMetadataKeys) {
				fmt.Printf("%v", test.expectedMetadataKeys)
				t.Errorf("FAILED '%s': got %v, expect %v",
					test.name, res, test.expectedMetadataKeys)
			} else {
				for _, val := range res {
					if metadataVal, _ := metadata.InstanceAttributeValue(val); metadataVal != test.metadata[val] {
						t.Errorf("FAILED '%s': got %v, expect %v",
							test.name, metadataVal, test.metadata[val])
					}
				}
			}
		})
	}
}