package pflag

import (

	"fmt"

	"strconv"

	"strings"

)

// -- uintSlice Value

type uintSliceValue struct {

	value   *[]uint

	changed bool

}

func newUintSliceValue(val []uint, p *[]uint) *uintSliceValue {

	uisv := new(uintSliceValue)

	uisv.value = p

	*uisv.value = val

	return uisv

}

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

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

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

	for i, d := range ss {

		u, err := strconv.ParseUint(d, 10, 0)

		if err != nil {

			return err

		}

		out[i] = uint(u)

	}

	if !s.changed {

		*s.value = out

	} else {

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

	}

	s.changed = true

	return nil

}

func (s *uintSliceValue) Type() string {

	return "uintSlice"

}

func (s *uintSliceValue) 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 uintSliceConv(val string) (interface{}, error) {

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

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

	if len(val) == 0 {

		return []uint{}, nil

	}

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

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

	for i, d := range ss {

		u, err := strconv.ParseUint(d, 10, 0)

		if err != nil {

			return nil, err

		}

		out[i] = uint(u)

	}

	return out, nil

}

// GetUintSlice returns the []uint value of a flag with the given name.

func (f *FlagSet) GetUintSlice(name string) ([]uint, error) {

	val, err := f.getFlagType(name, "uintSlice", uintSliceConv)

	if err != nil {

		return []uint{}, err

	}

	return val.([]uint), nil

}

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

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

func (f *FlagSet) UintSliceVar(p *[]uint, name string, value []uint, usage string) {

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

}

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

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

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

}

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

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

func UintSliceVar(p *[]uint, name string, value []uint, usage string) {

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

}

// UintSliceVarP is like the UintSliceVar, but accepts a shorthand letter that can be used after a single dash.

func UintSliceVarP(p *[]uint, name, shorthand string, value []uint, usage string) {

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

}

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

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

func (f *FlagSet) UintSlice(name string, value []uint, usage string) *[]uint {

	p := []uint{}

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

	return &p

}

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

func (f *FlagSet) UintSliceP(name, shorthand string, value []uint, usage string) *[]uint {

	p := []uint{}

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

	return &p

}

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

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

func UintSlice(name string, value []uint, usage string) *[]uint {

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

}

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

func UintSliceP(name, shorthand string, value []uint, usage string) *[]uint {

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

}