package config

import (
	"io"
	"os"

	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

func NewLogger(version Version, output io.Writer, args []string) (*zap.Logger, func()) {
	parsedCliArgs, _ := ParseArgs(version, os.Exit, args)
	syncs := []zapcore.WriteSyncer{zapcore.AddSync(output)}
	encoderConfig := zap.NewProductionEncoderConfig()
	encoderConfig.EncodeTime = zapcore.RFC3339NanoTimeEncoder

	core := zapcore.NewCore(
		zapcore.NewJSONEncoder(encoderConfig),
		zap.CombineWriteSyncers(syncs...),
		zap.DebugLevel,
	)
	logger := zap.New(core).WithOptions(
		zap.AddStacktrace(zap.ErrorLevel),
		zap.WithCaller(false),
	).With(
		zap.String("version", version.Release),
		zap.String("environment", *parsedCliArgs.Environment),
	)
	finalizer := func() {
		//  This might fail if logging to console, but we don't care (https://github.com/uber-go/zap/issues/880)
		_ = logger.Sync()
	}
	return logger, finalizer
}