package pflag

import (

	"fmt"

	"strconv"

	"strings"

)

// -- int64Slice Value

type int64SliceValue struct {

	value   *[]int64

	changed bool

}

func newInt64SliceValue(val []int64, p *[]int64) *int64SliceValue {

	isv := new(int64SliceValue)

	isv.value = p

	*isv.value = val

	return isv

}

func (s *int64SliceValue) Set(val string) error {

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

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

	for i, d := range ss {

		var err error

		out[i], err = strconv.ParseInt(d, 0, 64)

		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 *int64SliceValue) Type() string {

	return "int64Slice"

}

func (s *int64SliceValue) 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 (s *int64SliceValue) fromString(val string) (int64, error) {

	return strconv.ParseInt(val, 0, 64)

}

func (s *int64SliceValue) toString(val int64) string {

	return fmt.Sprintf("%d", val)

}

func (s *int64SliceValue) Append(val string) error {

	i, err := s.fromString(val)

	if err != nil {

		return err

	}

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

	return nil

}

func (s *int64SliceValue) Replace(val []string) error {

	out := make([]int64, len(val))

	for i, d := range val {

		var err error

		out[i], err = s.fromString(d)

		if err != nil {

			return err

		}

	}

	*s.value = out

	return nil

}

func (s *int64SliceValue) GetSlice() []string {

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

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

		out[i] = s.toString(d)

	}

	return out

}

func int64SliceConv(val string) (interface{}, error) {

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

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

	if len(val) == 0 {

		return []int64{}, nil

	}

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

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

	for i, d := range ss {

		var err error

		out[i], err = strconv.ParseInt(d, 0, 64)

		if err != nil {

			return nil, err

		}

	}

	return out, nil

}

// GetInt64Slice return the []int64 value of a flag with the given name

func (f *FlagSet) GetInt64Slice(name string) ([]int64, error) {

	val, err := f.getFlagType(name, "int64Slice", int64SliceConv)

	if err != nil {

		return []int64{}, err

	}

	return val.([]int64), nil

}

// Int64SliceVar defines a int64Slice flag with specified name, default value, and usage string.

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

func (f *FlagSet) Int64SliceVar(p *[]int64, name string, value []int64, usage string) {

	f.VarP(newInt64SliceValue(value, p), name, "", usage)

}

// Int64SliceVarP is like Int64SliceVar, but accepts a shorthand letter that can be used after a single dash.

func (f *FlagSet) Int64SliceVarP(p *[]int64, name, shorthand string, value []int64, usage string) {

	f.VarP(newInt64SliceValue(value, p), name, shorthand, usage)

}

// Int64SliceVar defines a int64[] flag with specified name, default value, and usage string.

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

func Int64SliceVar(p *[]int64, name string, value []int64, usage string) {

	CommandLine.VarP(newInt64SliceValue(value, p), name, "", usage)

}

// Int64SliceVarP is like Int64SliceVar, but accepts a shorthand letter that can be used after a single dash.

func Int64SliceVarP(p *[]int64, name, shorthand string, value []int64, usage string) {

	CommandLine.VarP(newInt64SliceValue(value, p), name, shorthand, usage)

}

// Int64Slice defines a []int64 flag with specified name, default value, and usage string.

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

func (f *FlagSet) Int64Slice(name string, value []int64, usage string) *[]int64 {

	p := []int64{}

	f.Int64SliceVarP(&p, name, "", value, usage)

	return &p

}

// Int64SliceP is like Int64Slice, but accepts a shorthand letter that can be used after a single dash.

func (f *FlagSet) Int64SliceP(name, shorthand string, value []int64, usage string) *[]int64 {

	p := []int64{}

	f.Int64SliceVarP(&p, name, shorthand, value, usage)

	return &p

}

// Int64Slice defines a []int64 flag with specified name, default value, and usage string.

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

func Int64Slice(name string, value []int64, usage string) *[]int64 {

	return CommandLine.Int64SliceP(name, "", value, usage)

}

// Int64SliceP is like Int64Slice, but accepts a shorthand letter that can be used after a single dash.

func Int64SliceP(name, shorthand string, value []int64, usage string) *[]int64 {

	return CommandLine.Int64SliceP(name, shorthand, value, usage)

}