// Copyright 2019 PingCAP, 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 log

import (
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
	"go.uber.org/zap/zaptest"
)

// MakeTestLogger creates a Logger instance which produces JSON logs.
func MakeTestLogger(opts ...zap.Option) (Logger, *zaptest.Buffer) {
	buffer := new(zaptest.Buffer)
	logger := zap.New(zapcore.NewCore(
		zapcore.NewJSONEncoder(zapcore.EncoderConfig{
			LevelKey:       "$lvl",
			MessageKey:     "$msg",
			EncodeLevel:    zapcore.CapitalLevelEncoder,
			EncodeDuration: zapcore.StringDurationEncoder,
		}),
		buffer,
		zap.DebugLevel,
	), opts...)
	return Logger{Logger: logger}, buffer
}