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package pflag
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import (
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	"fmt"
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	"strconv"
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	"strings"
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)
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// -- intSlice Value
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type intSliceValue struct {
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	value   *[]int
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	changed bool
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}
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func newIntSliceValue(val []int, p *[]int) *intSliceValue {
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	isv := new(intSliceValue)
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	isv.value = p
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	*isv.value = val
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	return isv
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}
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func (s *intSliceValue) Set(val string) error {
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	ss := strings.Split(val, ",")
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	out := make([]int, len(ss))
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	for i, d := range ss {
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		var err error
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		out[i], err = strconv.Atoi(d)
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		if err != nil {
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			return err
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		}
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	}
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	if !s.changed {
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		*s.value = out
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	} else {
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		*s.value = append(*s.value, out...)
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	}
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	s.changed = true
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	return nil
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}
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func (s *intSliceValue) Type() string {
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	return "intSlice"
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}
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func (s *intSliceValue) String() string {
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	out := make([]string, len(*s.value))
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	for i, d := range *s.value {
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		out[i] = fmt.Sprintf("%d", d)
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	}
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	return "[" + strings.Join(out, ",") + "]"
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}
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func (s *intSliceValue) Append(val string) error {
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	i, err := strconv.Atoi(val)
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	if err != nil {
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		return err
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	}
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	*s.value = append(*s.value, i)
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	return nil
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}
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func (s *intSliceValue) Replace(val []string) error {
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	out := make([]int, len(val))
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	for i, d := range val {
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		var err error
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		out[i], err = strconv.Atoi(d)
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		if err != nil {
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			return err
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		}
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	}
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	*s.value = out
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	return nil
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}
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func (s *intSliceValue) GetSlice() []string {
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	out := make([]string, len(*s.value))
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	for i, d := range *s.value {
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		out[i] = strconv.Itoa(d)
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	}
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	return out
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}
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func intSliceConv(val string) (interface{}, error) {
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	val = strings.Trim(val, "[]")
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	// Empty string would cause a slice with one (empty) entry
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	if len(val) == 0 {
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		return []int{}, nil
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	}
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	ss := strings.Split(val, ",")
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	out := make([]int, len(ss))
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	for i, d := range ss {
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		var err error
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		out[i], err = strconv.Atoi(d)
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		if err != nil {
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			return nil, err
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		}
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	}
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	return out, nil
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}
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// GetIntSlice return the []int value of a flag with the given name
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func (f *FlagSet) GetIntSlice(name string) ([]int, error) {
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	val, err := f.getFlagType(name, "intSlice", intSliceConv)
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	if err != nil {
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		return []int{}, err
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	}
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	return val.([]int), nil
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}
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// IntSliceVar defines a intSlice flag with specified name, default value, and usage string.
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// The argument p points to a []int variable in which to store the value of the flag.
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func (f *FlagSet) IntSliceVar(p *[]int, name string, value []int, usage string) {
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	f.VarP(newIntSliceValue(value, p), name, "", usage)
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}
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// IntSliceVarP is like IntSliceVar, but accepts a shorthand letter that can be used after a single dash.
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func (f *FlagSet) IntSliceVarP(p *[]int, name, shorthand string, value []int, usage string) {
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	f.VarP(newIntSliceValue(value, p), name, shorthand, usage)
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}
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// IntSliceVar defines a int[] flag with specified name, default value, and usage string.
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// The argument p points to a int[] variable in which to store the value of the flag.
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func IntSliceVar(p *[]int, name string, value []int, usage string) {
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	CommandLine.VarP(newIntSliceValue(value, p), name, "", usage)
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}
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// IntSliceVarP is like IntSliceVar, but accepts a shorthand letter that can be used after a single dash.
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func IntSliceVarP(p *[]int, name, shorthand string, value []int, usage string) {
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	CommandLine.VarP(newIntSliceValue(value, p), name, shorthand, usage)
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}
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// IntSlice defines a []int flag with specified name, default value, and usage string.
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// The return value is the address of a []int variable that stores the value of the flag.
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func (f *FlagSet) IntSlice(name string, value []int, usage string) *[]int {
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	p := []int{}
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	f.IntSliceVarP(&p, name, "", value, usage)
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	return &p
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}
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// IntSliceP is like IntSlice, but accepts a shorthand letter that can be used after a single dash.
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func (f *FlagSet) IntSliceP(name, shorthand string, value []int, usage string) *[]int {
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	p := []int{}
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	f.IntSliceVarP(&p, name, shorthand, value, usage)
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	return &p
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}
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// IntSlice defines a []int flag with specified name, default value, and usage string.
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// The return value is the address of a []int variable that stores the value of the flag.
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func IntSlice(name string, value []int, usage string) *[]int {
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	return CommandLine.IntSliceP(name, "", value, usage)
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}
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// IntSliceP is like IntSlice, but accepts a shorthand letter that can be used after a single dash.
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func IntSliceP(name, shorthand string, value []int, usage string) *[]int {
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	return CommandLine.IntSliceP(name, shorthand, value, usage)
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}
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