package data

import (
	"errors"
	"fmt"
	"strconv"
	"strings"
)

var ErrInvalidRuntimeFormat = errors.New("invalid runtime format, should be something like '102 mins'")

type Runtime int32

func (r Runtime) MarshalJSON() ([]byte, error) {
	jsonValue := fmt.Sprintf("%d mins", r)

	quotedJSONValue := strconv.Quote(jsonValue)
	return []byte(quotedJSONValue), nil

}

func (r *Runtime) UnmarshalJSON(jsonValue []byte) error {
	unquoJSONValue, err := strconv.Unquote(string(jsonValue))
	if err != nil {
		return ErrInvalidRuntimeFormat
	}

	jsonParts := strings.Split(unquoJSONValue, " ")

	if len(jsonParts) != 2 || (jsonParts[1] != "mins" && jsonParts[1] != "minutes") {
		return ErrInvalidRuntimeFormat
	}

	i, err := strconv.ParseInt(jsonParts[0], 10, 32)
	if err != nil {
		return ErrInvalidRuntimeFormat
	}

	*r = Runtime(i)

	return nil
}