package question

import (
	"math/rand"
	"strconv"
	"text/template"

	"github.com/hhhapz/codequest/models"
)

var Questions []*Question

func Register(q *Question) {
	Questions = append(Questions, q)
}

func QuestionByID(id string) *Question {
	for _, q := range Questions {
		if q.ID == id {
			return q
		}
	}
	return nil
}

type Question struct {
	ID    string
	Name  string
	Text  *template.Template
	Level Level

	Generate func(user *models.User) string
	Validate func(user *models.User, part Part, solution string) bool
}

type Level int

const (
	Level1 Level = iota
	Level2
)

type Part int

const (
	Part1 Part = iota
	Part2
)

// TODO: Internal autoincrement id
func UserRandom(u *models.User) *rand.Rand {
	id := u.ID
	if len(id) > 17 {
		id = id[:17]
	}
	seed, _ := strconv.ParseInt(id, 10, 64)
	return rand.New(rand.NewSource(seed))
}