// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package flag

import (
	"fmt"
	"strings"
)

type (
	StringMap map[string]string
)

func (m *StringMap) Set(value string) error {
	if m == nil {
		return fmt.Errorf("StringMap is nil")
	}
	if *m == nil {
		*m = make(map[string]string)
	}
	for _, s := range strings.Split(value, ",") {
		kv := strings.Split(s, "=")
		if len(kv) != 2 {
			return fmt.Errorf("should be in 'key1=value1,key2=value2,...,keyN=valueN' format")
		}
		(*m)[kv[0]] = kv[1]
	}
	return nil
}

func (m *StringMap) String() string {
	if m == nil {
		return fmt.Sprintf("%v", map[string]string(nil))
	}
	return fmt.Sprintf("%v", *m)
}

func (m *StringMap) Value() map[string]string {
	if m == nil {
		return nil
	}
	return *m
}
