package pflag

import (

	"bytes"

	"fmt"

	"strconv"

	"strings"

)

// -- stringToInt64 Value

type stringToInt64Value struct {

	value   *map[string]int64

	changed bool

}

func newStringToInt64Value(val map[string]int64, p *map[string]int64) *stringToInt64Value {

	ssv := new(stringToInt64Value)

	ssv.value = p

	*ssv.value = val

	return ssv

}

// Format: a=1,b=2

func (s *stringToInt64Value) Set(val string) error {

	ss := strings.Split(val, ",")

	out := make(map[string]int64, len(ss))

	for _, pair := range ss {

		kv := strings.SplitN(pair, "=", 2)

		if len(kv) != 2 {

			return fmt.Errorf("%s must be formatted as key=value", pair)

		}

		var err error

		out[kv[0]], err = strconv.ParseInt(kv[1], 10, 64)

		if err != nil {

			return err

		}

	}

	if !s.changed {

		*s.value = out

	} else {

		for k, v := range out {

			(*s.value)[k] = v

		}

	}

	s.changed = true

	return nil

}

func (s *stringToInt64Value) Type() string {

	return "stringToInt64"

}

func (s *stringToInt64Value) String() string {

	var buf bytes.Buffer

	i := 0

	for k, v := range *s.value {

		if i > 0 {

			buf.WriteRune(',')

		}

		buf.WriteString(k)

		buf.WriteRune('=')

		buf.WriteString(strconv.FormatInt(v, 10))

		i++

	}

	return "[" + buf.String() + "]"

}

func stringToInt64Conv(val string) (interface{}, error) {

	val = strings.Trim(val, "[]")

	// An empty string would cause an empty map

	if len(val) == 0 {

		return map[string]int64{}, nil

	}

	ss := strings.Split(val, ",")

	out := make(map[string]int64, len(ss))

	for _, pair := range ss {

		kv := strings.SplitN(pair, "=", 2)

		if len(kv) != 2 {

			return nil, fmt.Errorf("%s must be formatted as key=value", pair)

		}

		var err error

		out[kv[0]], err = strconv.ParseInt(kv[1], 10, 64)

		if err != nil {

			return nil, err

		}

	}

	return out, nil

}

// GetStringToInt64 return the map[string]int64 value of a flag with the given name

func (f *FlagSet) GetStringToInt64(name string) (map[string]int64, error) {

	val, err := f.getFlagType(name, "stringToInt64", stringToInt64Conv)

	if err != nil {

		return map[string]int64{}, err

	}

	return val.(map[string]int64), nil

}

// StringToInt64Var defines a string flag with specified name, default value, and usage string.

// The argument p point64s to a map[string]int64 variable in which to store the values of the multiple flags.

// The value of each argument will not try to be separated by comma

func (f *FlagSet) StringToInt64Var(p *map[string]int64, name string, value map[string]int64, usage string) {

	f.VarP(newStringToInt64Value(value, p), name, "", usage)

}

// StringToInt64VarP is like StringToInt64Var, but accepts a shorthand letter that can be used after a single dash.

func (f *FlagSet) StringToInt64VarP(p *map[string]int64, name, shorthand string, value map[string]int64, usage string) {

	f.VarP(newStringToInt64Value(value, p), name, shorthand, usage)

}

// StringToInt64Var defines a string flag with specified name, default value, and usage string.

// The argument p point64s to a map[string]int64 variable in which to store the value of the flag.

// The value of each argument will not try to be separated by comma

func StringToInt64Var(p *map[string]int64, name string, value map[string]int64, usage string) {

	CommandLine.VarP(newStringToInt64Value(value, p), name, "", usage)

}

// StringToInt64VarP is like StringToInt64Var, but accepts a shorthand letter that can be used after a single dash.

func StringToInt64VarP(p *map[string]int64, name, shorthand string, value map[string]int64, usage string) {

	CommandLine.VarP(newStringToInt64Value(value, p), name, shorthand, usage)

}

// StringToInt64 defines a string flag with specified name, default value, and usage string.

// The return value is the address of a map[string]int64 variable that stores the value of the flag.

// The value of each argument will not try to be separated by comma

func (f *FlagSet) StringToInt64(name string, value map[string]int64, usage string) *map[string]int64 {

	p := map[string]int64{}

	f.StringToInt64VarP(&p, name, "", value, usage)

	return &p

}

// StringToInt64P is like StringToInt64, but accepts a shorthand letter that can be used after a single dash.

func (f *FlagSet) StringToInt64P(name, shorthand string, value map[string]int64, usage string) *map[string]int64 {

	p := map[string]int64{}

	f.StringToInt64VarP(&p, name, shorthand, value, usage)

	return &p

}

// StringToInt64 defines a string flag with specified name, default value, and usage string.

// The return value is the address of a map[string]int64 variable that stores the value of the flag.

// The value of each argument will not try to be separated by comma

func StringToInt64(name string, value map[string]int64, usage string) *map[string]int64 {

	return CommandLine.StringToInt64P(name, "", value, usage)

}

// StringToInt64P is like StringToInt64, but accepts a shorthand letter that can be used after a single dash.

func StringToInt64P(name, shorthand string, value map[string]int64, usage string) *map[string]int64 {

	return CommandLine.StringToInt64P(name, shorthand, value, usage)

}