package pflag

import (

	"bytes"

	"fmt"

	"strconv"

	"strings"

)

// -- stringToInt Value

type stringToIntValue struct {

	value   *map[string]int

	changed bool

}

func newStringToIntValue(val map[string]int, p *map[string]int) *stringToIntValue {

	ssv := new(stringToIntValue)

	ssv.value = p

	*ssv.value = val

	return ssv

}

// Format: a=1,b=2

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

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

	out := make(map[string]int, 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.Atoi(kv[1])

		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 *stringToIntValue) Type() string {

	return "stringToInt"

}

func (s *stringToIntValue) 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.Itoa(v))

		i++

	}

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

}

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

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

	// An empty string would cause an empty map

	if len(val) == 0 {

		return map[string]int{}, nil

	}

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

	out := make(map[string]int, 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.Atoi(kv[1])

		if err != nil {

			return nil, err

		}

	}

	return out, nil

}

// GetStringToInt return the map[string]int value of a flag with the given name

func (f *FlagSet) GetStringToInt(name string) (map[string]int, error) {

	val, err := f.getFlagType(name, "stringToInt", stringToIntConv)

	if err != nil {

		return map[string]int{}, err

	}

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

}

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

// The argument p points to a map[string]int 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) StringToIntVar(p *map[string]int, name string, value map[string]int, usage string) {

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

}

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

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

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

}

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

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

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

func StringToIntVar(p *map[string]int, name string, value map[string]int, usage string) {

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

}

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

func StringToIntVarP(p *map[string]int, name, shorthand string, value map[string]int, usage string) {

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

}

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

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

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

func (f *FlagSet) StringToInt(name string, value map[string]int, usage string) *map[string]int {

	p := map[string]int{}

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

	return &p

}

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

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

	p := map[string]int{}

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

	return &p

}

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

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

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

func StringToInt(name string, value map[string]int, usage string) *map[string]int {

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

}

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

func StringToIntP(name, shorthand string, value map[string]int, usage string) *map[string]int {

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

}