package storage

import (
	"encoding/json"
	"strings"

	"github.com/buger/jsonparser"
)

const prefix_answer = "answer_"

type Answer struct {
	Pair
	Right bool `json:"right"`
}

func NewAnswer(text string) Answer {
	return Answer{Pair: New(prefix_answer+NewID(), text)}
}

func IsAnswer(ID string) bool {
	return strings.HasPrefix(ID, prefix_answer)
}

func (a *Answer) UnmarshalJSON(b []byte) error {
	if err := json.Unmarshal(b, &a.Pair); err != nil {
		return err
	}
	if right, err := jsonparser.GetBoolean(b, "right"); err != nil && err != jsonparser.KeyPathNotFoundError {
		return err
	} else {
		a.Right = right
	}
	return nil
}