// Copyright 2014 Prometheus Team
// 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 codable

import (
	"encoding"
	"reflect"
	"testing"
)

func newFingerprint(fp int64) *Fingerprint {
	cfp := Fingerprint(fp)
	return &cfp
}

func newLabelName(ln string) *LabelName {
	cln := LabelName(ln)
	return &cln
}

func TestCodec(t *testing.T) {
	scenarios := []struct {
		in    encoding.BinaryMarshaler
		out   encoding.BinaryUnmarshaler
		equal func(in, out interface{}) bool
	}{
		{
			in: &Metric{
				"label_1": "value_2",
				"label_2": "value_2",
				"label_3": "value_3",
			},
			out: &Metric{},
		}, {
			in:  newFingerprint(12345),
			out: newFingerprint(0),
		}, {
			in:  &Fingerprints{1, 2, 56, 1234},
			out: &Fingerprints{},
		}, {
			in:  &Fingerprints{1, 2, 56, 1234},
			out: &FingerprintSet{},
			equal: func(in, out interface{}) bool {
				inSet := FingerprintSet{}
				for _, fp := range *(in.(*Fingerprints)) {
					inSet[fp] = struct{}{}
				}
				return reflect.DeepEqual(inSet, *(out.(*FingerprintSet)))
			},
		}, {
			in: &FingerprintSet{
				1:    struct{}{},
				2:    struct{}{},
				56:   struct{}{},
				1234: struct{}{},
			},
			out: &FingerprintSet{},
		}, {
			in: &FingerprintSet{
				1:    struct{}{},
				2:    struct{}{},
				56:   struct{}{},
				1234: struct{}{},
			},
			out: &Fingerprints{},
			equal: func(in, out interface{}) bool {
				outSet := FingerprintSet{}
				for _, fp := range *(out.(*Fingerprints)) {
					outSet[fp] = struct{}{}
				}
				return reflect.DeepEqual(outSet, *(in.(*FingerprintSet)))
			},
		}, {
			in: &LabelPair{
				Name:  "label_name",
				Value: "label_value",
			},
			out: &LabelPair{},
		}, {
			in:  newLabelName("label_name"),
			out: newLabelName(""),
		}, {
			in:  &LabelValues{"value_1", "value_2", "value_3"},
			out: &LabelValues{},
		}, {
			in:  &LabelValues{"value_1", "value_2", "value_3"},
			out: &LabelValueSet{},
			equal: func(in, out interface{}) bool {
				inSet := LabelValueSet{}
				for _, lv := range *(in.(*LabelValues)) {
					inSet[lv] = struct{}{}
				}
				return reflect.DeepEqual(inSet, *(out.(*LabelValueSet)))
			},
		}, {
			in: &LabelValueSet{
				"value_1": struct{}{},
				"value_2": struct{}{},
				"value_3": struct{}{},
			},
			out: &LabelValueSet{},
		}, {
			in: &LabelValueSet{
				"value_1": struct{}{},
				"value_2": struct{}{},
				"value_3": struct{}{},
			},
			out: &LabelValues{},
			equal: func(in, out interface{}) bool {
				outSet := LabelValueSet{}
				for _, lv := range *(out.(*LabelValues)) {
					outSet[lv] = struct{}{}
				}
				return reflect.DeepEqual(outSet, *(in.(*LabelValueSet)))
			},
		}, {
			in:  &TimeRange{42, 2001},
			out: &TimeRange{},
		},
	}

	for i, s := range scenarios {
		encoded, err := s.in.MarshalBinary()
		if err != nil {
			t.Fatal(err)
		}
		if err := s.out.UnmarshalBinary(encoded); err != nil {
			t.Fatal(err)
		}
		equal := s.equal
		if equal == nil {
			equal = reflect.DeepEqual
		}
		if !equal(s.in, s.out) {
			t.Errorf("%d. Got: %v; want %v; encoded bytes are: %v", i, s.out, s.in, encoded)
		}
	}
}