package restutil

import (
	"fmt"
	"net/http"
	"strconv"
)

func IntParam(r *http.Request, key string) (val int, err error) {
	str := r.URL.Query().Get(key)
	if str == "" {
		return
	}

	val, err = strconv.Atoi(str)
	if err != nil {
		err = WrappErr(
			err,
			ErrorTypeValidation,
			fmt.Sprintf("failed to parse query parameter '%s': not an int", key),
		)
	}
	return
}