/*
 * Copyright (c) 2020 Baidu, 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 flag

import (
	goflag "flag"
	"strings"

	"github.com/spf13/pflag"

	"github.com/baidu/easyfaas/pkg/util/logs"
)

// WordSepNormalizeFunc changes all flags that contain "_" separators
func WordSepNormalizeFunc(f *pflag.FlagSet, name string) pflag.NormalizedName {
	if strings.Contains(name, "_") {
		return pflag.NormalizedName(strings.Replace(name, "_", "-", -1))
	}
	return pflag.NormalizedName(name)
}

// WarnWordSepNormalizeFunc changes and warns for flags that contain "_" separators
func WarnWordSepNormalizeFunc(f *pflag.FlagSet, name string) pflag.NormalizedName {
	if strings.Contains(name, "_") {
		nname := strings.Replace(name, "_", "-", -1)
		logs.Warnf("%s is DEPRECATED and will be removed in a future version. Use %s instead.", name, nname)

		return pflag.NormalizedName(nname)
	}
	return pflag.NormalizedName(name)
}

// InitFlags normalizes, parses, then logs the command line flags
func InitFlags() {
	pflag.CommandLine.SetNormalizeFunc(WordSepNormalizeFunc)
	pflag.CommandLine.AddGoFlagSet(goflag.CommandLine)
	pflag.Parse()
	goflag.CommandLine.Parse([]string{})
	pflag.VisitAll(func(flag *pflag.Flag) {
		logs.V(4).Infof("FLAG: --%s=%q", flag.Name, flag.Value)
	})
}
