package pflag

import (

	"fmt"

	"strconv"

	"strings"

)

// -- intSlice Value

type intSliceValue struct {

	value   *[]int

	changed bool

}

func newIntSliceValue(val []int, p *[]int) *intSliceValue {

	isv := new(intSliceValue)

	isv.value = p

	*isv.value = val

	return isv

}

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

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

	out := make([]int, len(ss))

	for i, d := range ss {

		var err error

		out[i], err = strconv.Atoi(d)

		if err != nil {

			return err

		}

	}

	if !s.changed {

		*s.value = out

	} else {

		*s.value = append(*s.value, out...)

	}

	s.changed = true

	return nil

}

func (s *intSliceValue) Type() string {

	return "intSlice"

}

func (s *intSliceValue) String() string {

	out := make([]string, len(*s.value))

	for i, d := range *s.value {

		out[i] = fmt.Sprintf("%d", d)

	}

	return "[" + strings.Join(out, ",") + "]"

}

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

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

	// Empty string would cause a slice with one (empty) entry

	if len(val) == 0 {

		return []int{}, nil

	}

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

	out := make([]int, len(ss))

	for i, d := range ss {

		var err error

		out[i], err = strconv.Atoi(d)

		if err != nil {

			return nil, err

		}

	}

	return out, nil

}

// GetIntSlice return the []int value of a flag with the given name

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

	val, err := f.getFlagType(name, "intSlice", intSliceConv)

	if err != nil {

		return []int{}, err

	}

	return val.([]int), nil

}

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

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

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

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

}

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

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

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

}

// IntSliceVar defines a int[] flag with specified name, default value, and usage string.

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

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

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

}

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

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

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

}

// IntSlice defines a []int flag with specified name, default value, and usage string.

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

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

	p := []int{}

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

	return &p

}

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

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

	p := []int{}

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

	return &p

}

// IntSlice defines a []int flag with specified name, default value, and usage string.

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

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

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

}

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

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

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

}