card_id/common/game/game.go

package game

import (
	"git.tuxpa.in/a/card_id/common/game/card"
	"lukechampine.com/frand"
)

type Game struct {
	Lives  int
	Dealer *card.Dealer
}

func (g *Game) CreateTrial(pairs int, extra int) *Trial {
	if pairs > 10 {
		pairs = 10
	}
	cards := make([]card.Card, 0, pairs*2+extra)
	ids := map[int]struct{}{}
	deck := g.Dealer.GetBrand().GetDeck()

	for i := 0; i < pairs; {
		card := deck.Draw()
		if _, ok := ids[card.Id]; !ok {
			ids[card.Id] = struct{}{}
			cards = append(cards, card, card)
			i = i + 1
		}
	}

	for i := 0; i < extra; {
		card := deck.Draw()
		if _, ok := ids[card.Id]; !ok {
			ids[card.Id] = struct{}{}
			cards = append(cards, card)
			i = i + 1
		}
	}

	frand.Shuffle(len(cards), func(i, j int) { cards[i], cards[j] = cards[j], cards[i] })
	trial := NewTrial(g.Lives)
	for k, v := range cards {
		trial.Cards[k+1] = v
	}
	return trial
}