package opflag

import (
	"fmt"
	"strconv"
)

// -- float64 Value
type float64Value float64

func newFloat64Value(val float64, p *float64) *float64Value {
	*p = val
	return (*float64Value)(p)
}

func (f *float64Value) Set(s string) error {
	v, err := strconv.ParseFloat(s, 64)
	*f = float64Value(v)
	return err
}

func (f *float64Value) String() string { return fmt.Sprintf("%v", *f) }

// Float64Var 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 (f *FlagSet) Float64Var(p *float64, name string, value float64, usage string) {
	f.VarP(newFloat64Value(value, p), name, "", usage)
}

// Like Float64Var, but accepts a shorthand letter that can be used after a single dash.
func (f *FlagSet) Float64VarP(p *float64, name, shorthand string, value float64, usage string) {
	f.VarP(newFloat64Value(value, p), name, shorthand, usage)
}

// Float64Var 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 Float64Var(p *float64, name string, value float64, usage string) {
	CommandLine.VarP(newFloat64Value(value, p), name, "", usage)
}

// Like Float64Var, but accepts a shorthand letter that can be used after a single dash.
func Float64VarP(p *float64, name, shorthand string, value float64, usage string) {
	CommandLine.VarP(newFloat64Value(value, p), name, shorthand, usage)
}

// Float64 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) Float64(name string, value float64, usage string) *float64 {
	p := new(float64)
	f.Float64VarP(p, name, "", value, usage)
	return p
}

// Like Float64, but accepts a shorthand letter that can be used after a single dash.
func (f *FlagSet) Float64P(name, shorthand string, value float64, usage string) *float64 {
	p := new(float64)
	f.Float64VarP(p, name, shorthand, value, usage)
	return p
}

// Float64 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 Float64(name string, value float64, usage string) *float64 {
	return CommandLine.Float64P(name, "", value, usage)
}

// Like Float64, but accepts a shorthand letter that can be used after a single dash.
func Float64P(name, shorthand string, value float64, usage string) *float64 {
	return CommandLine.Float64P(name, shorthand, value, usage)
}
