package graphql

import (
	"fmt"
	"io"
	"strconv"
)

func MarshalFloat(f float64) Marshaler {
	return WriterFunc(func(w io.Writer) {
		io.WriteString(w, fmt.Sprintf("%f", f))
	})
}

func UnmarshalFloat(v interface{}) (float64, error) {
	switch v := v.(type) {
	case string:
		return strconv.ParseFloat(v, 64)
	case int:
		return float64(v), nil
	case float64:
		return v, nil
	default:
		return 0, fmt.Errorf("%T is not an float", v)
	}
}