package pflag

import (

	"fmt"

	"strconv"

	"strings"

)

// -- float64Slice Value

type float64SliceValue struct {

	value   *[]float64

	changed bool

}

func newFloat64SliceValue(val []float64, p *[]float64) *float64SliceValue {

	isv := new(float64SliceValue)

	isv.value = p

	*isv.value = val

	return isv

}

func (s *float64SliceValue) Set(val string) error {

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

	out := make([]float64, len(ss))

	for i, d := range ss {

		var err error

		out[i], err = strconv.ParseFloat(d, 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 *float64SliceValue) Type() string {

	return "float64Slice"

}

func (s *float64SliceValue) String() string {

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

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

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

	}

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

}

func (s *float64SliceValue) fromString(val string) (float64, error) {

	return strconv.ParseFloat(val, 64)

}

func (s *float64SliceValue) toString(val float64) string {

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

}

func (s *float64SliceValue) Append(val string) error {

	i, err := s.fromString(val)

	if err != nil {

		return err

	}

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

	return nil

}

func (s *float64SliceValue) Replace(val []string) error {

	out := make([]float64, 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 *float64SliceValue) GetSlice() []string {

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

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

		out[i] = s.toString(d)

	}

	return out

}

func float64SliceConv(val string) (interface{}, error) {

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

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

	if len(val) == 0 {

		return []float64{}, nil

	}

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

	out := make([]float64, len(ss))

	for i, d := range ss {

		var err error

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

		if err != nil {

			return nil, err

		}

	}

	return out, nil

}

// GetFloat64Slice return the []float64 value of a flag with the given name

func (f *FlagSet) GetFloat64Slice(name string) ([]float64, error) {

	val, err := f.getFlagType(name, "float64Slice", float64SliceConv)

	if err != nil {

		return []float64{}, err

	}

	return val.([]float64), nil

}

// Float64SliceVar defines a float64Slice flag with specified name, default value, and usage string.

// The argument p points to a []float64 variable in which to store the value of the flag.

func (f *FlagSet) Float64SliceVar(p *[]float64, name string, value []float64, usage string) {

	f.VarP(newFloat64SliceValue(value, p), name, "", usage)

}

// Float64SliceVarP is like Float64SliceVar, but accepts a shorthand letter that can be used after a single dash.

func (f *FlagSet) Float64SliceVarP(p *[]float64, name, shorthand string, value []float64, usage string) {

	f.VarP(newFloat64SliceValue(value, p), name, shorthand, usage)

}

// Float64SliceVar defines a float64[] flag with specified name, default value, and usage string.

// The argument p points to a float64[] variable in which to store the value of the flag.

func Float64SliceVar(p *[]float64, name string, value []float64, usage string) {

	CommandLine.VarP(newFloat64SliceValue(value, p), name, "", usage)

}

// Float64SliceVarP is like Float64SliceVar, but accepts a shorthand letter that can be used after a single dash.

func Float64SliceVarP(p *[]float64, name, shorthand string, value []float64, usage string) {

	CommandLine.VarP(newFloat64SliceValue(value, p), name, shorthand, usage)

}

// Float64Slice defines a []float64 flag with specified name, default value, and usage string.

// The return value is the address of a []float64 variable that stores the value of the flag.

func (f *FlagSet) Float64Slice(name string, value []float64, usage string) *[]float64 {

	p := []float64{}

	f.Float64SliceVarP(&p, name, "", value, usage)

	return &p

}

// Float64SliceP is like Float64Slice, but accepts a shorthand letter that can be used after a single dash.

func (f *FlagSet) Float64SliceP(name, shorthand string, value []float64, usage string) *[]float64 {

	p := []float64{}

	f.Float64SliceVarP(&p, name, shorthand, value, usage)

	return &p

}

// Float64Slice defines a []float64 flag with specified name, default value, and usage string.

// The return value is the address of a []float64 variable that stores the value of the flag.

func Float64Slice(name string, value []float64, usage string) *[]float64 {

	return CommandLine.Float64SliceP(name, "", value, usage)

}

// Float64SliceP is like Float64Slice, but accepts a shorthand letter that can be used after a single dash.

func Float64SliceP(name, shorthand string, value []float64, usage string) *[]float64 {

	return CommandLine.Float64SliceP(name, shorthand, value, usage)

}