// SPDX-License-Identifier: Apache-2.0
//
// The OpenSearch Contributors require contributions made to
// this file be licensed under the Apache-2.0 license or a
// compatible open source license.
//
// Modifications Copyright OpenSearch Contributors. See
// GitHub history for details.

// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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.

// +build !integration

package opensearchutil_test

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"strings"
	"testing"

	"github.com/opensearch-project/opensearch-go/v2/opensearchutil"
)

var _ = fmt.Print

type Foo struct {
	Bar string
}

func (f Foo) EncodeJSON(w io.Writer) error {
	var b bytes.Buffer
	b.WriteString(`{"bar":"`)
	b.WriteString(strings.ToUpper(f.Bar))
	b.WriteString(`"}`)
	b.WriteString("\n")
	_, err := b.WriteTo(w)
	if err != nil {
		return err
	}
	return nil
}

func BenchmarkJSONReader(b *testing.B) {
	b.ReportAllocs()

	b.Run("None", func(b *testing.B) {
		b.ResetTimer()

		var buf bytes.Buffer
		for i := 0; i < b.N; i++ {
			json.NewEncoder(&buf).Encode(map[string]string{"foo": "bar"})
			if string(buf.String()) != `{"foo":"bar"}`+"\n" {
				b.Fatalf("Unexpected output: %q", buf.String())
			}
			buf.Reset()
		}
	})

	b.Run("Default", func(b *testing.B) {
		b.ResetTimer()

		for i := 0; i < b.N; i++ {
			out, _ := ioutil.ReadAll(opensearchutil.NewJSONReader(map[string]string{"foo": "bar"}))
			if string(out) != `{"foo":"bar"}`+"\n" {
				b.Fatalf("Unexpected output: %q", out)
			}
		}
	})

	b.Run("Default-Copy", func(b *testing.B) {
		b.ResetTimer()

		var buf bytes.Buffer
		for i := 0; i < b.N; i++ {
			io.Copy(&buf, opensearchutil.NewJSONReader(map[string]string{"foo": "bar"}))
			if buf.String() != `{"foo":"bar"}`+"\n" {
				b.Fatalf("Unexpected output: %q", buf.String())
			}
			buf.Reset()
		}
	})

	b.Run("Custom", func(b *testing.B) {
		b.ResetTimer()

		for i := 0; i < b.N; i++ {
			out, _ := ioutil.ReadAll(opensearchutil.NewJSONReader(Foo{Bar: "baz"}))
			if string(out) != `{"bar":"BAZ"}`+"\n" {
				b.Fatalf("Unexpected output: %q", out)
			}
		}
	})
}