package pflag

import "strconv"

// -- count Value

type countValue int

func newCountValue(val int, p *int) *countValue {

	*p = val

	return (*countValue)(p)

}

func (i *countValue) Set(s string) error {

	// "+1" means that no specific value was passed, so increment

	if s == "+1" {

		*i = countValue(*i + 1)

		return nil

	}

	v, err := strconv.ParseInt(s, 0, 0)

	*i = countValue(v)

	return err

}

func (i *countValue) Type() string {

	return "count"

}

func (i *countValue) String() string { return strconv.Itoa(int(*i)) }

func countConv(sval string) (interface{}, error) {

	i, err := strconv.Atoi(sval)

	if err != nil {

		return nil, err

	}

	return i, nil

}

// GetCount return the int value of a flag with the given name

func (f *FlagSet) GetCount(name string) (int, error) {

	val, err := f.getFlagType(name, "count", countConv)

	if err != nil {

		return 0, err

	}

	return val.(int), nil

}

// CountVar defines a count flag with specified name, default value, and usage string.

// The argument p points to an int variable in which to store the value of the flag.

func (f *FlagSet) CountVar(p *int, name string, usage string) {

	f.CountVarP(p, name, "", usage)

}

// CountVarP is like CountVar only take a shorthand for the flag name.

func (f *FlagSet) CountVarP(p *int, name, shorthand string, usage string) {

	flag := f.VarPF(newCountValue(0, p), name, shorthand, usage)

	flag.NoOptDefVal = "+1"

}

// CountVar like CountVar only the flag is placed on the CommandLine instead of a given flag set

func CountVar(p *int, name string, usage string) {

	CommandLine.CountVar(p, name, usage)

}

// CountVarP is like CountVar only take a shorthand for the flag name.

func CountVarP(p *int, name, shorthand string, usage string) {

	CommandLine.CountVarP(p, name, shorthand, usage)

}

// Count defines a count flag with specified name, default value, and usage string.

// The return value is the address of an int variable that stores the value of the flag.

func (f *FlagSet) Count(name string, usage string) *int {

	p := new(int)

	f.CountVarP(p, name, "", usage)

	return p

}

// CountP is like Count only takes a shorthand for the flag name.

func (f *FlagSet) CountP(name, shorthand string, usage string) *int {

	p := new(int)

	f.CountVarP(p, name, shorthand, usage)

	return p

}

// Count defines a count flag with specified name, default value, and usage string.

// The return value is the address of an int variable that stores the value of the flag.

// A count flag will add 1 to its value evey time it is found on the command line

func Count(name string, usage string) *int {

	return CommandLine.CountP(name, "", usage)

}

// CountP is like Count only takes a shorthand for the flag name.

func CountP(name, shorthand string, usage string) *int {

	return CommandLine.CountP(name, shorthand, usage)

}