68 lines
1.9 KiB
Swift
68 lines
1.9 KiB
Swift
//
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// MemoryGame.swift
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// Memorize
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//
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// Created by ching on 2023/2/12.
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//
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import Foundation
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// model
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struct MemoryGame<CardContent> where CardContent: Equatable {
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private(set) var cards: [Card]
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private var indexOfTheOneAndOnlyFaceUpCard: Int? {
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get { cards.indices.filter { cards[$0].isFaceUp }.oneAndOnly }
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set { cards.indices.forEach { cards[$0].isFaceUp = ($0 == newValue) } }
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}
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mutating func choose(_ card: Card) {
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if let chosenIndex = cards.firstIndex(where: { $0.id == card.id }), !cards[chosenIndex].isFaceUp, !cards[chosenIndex].isMatched {
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if let potentialMatchIndex = indexOfTheOneAndOnlyFaceUpCard {
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if cards[chosenIndex].content == cards[potentialMatchIndex].content {
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cards[chosenIndex].isMatched = true
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cards[potentialMatchIndex].isMatched = true
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}
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cards[chosenIndex].isFaceUp.toggle()
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} else {
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indexOfTheOneAndOnlyFaceUpCard = chosenIndex
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}
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}
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}
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func index(of card: Card) -> Int? {
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for index in 0 ..< cards.count {
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if cards[index].id == card.id {
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return index
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}
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}
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return nil
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}
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init(numberOfPairsOfCards: Int, createCardContent: (Int) -> CardContent) {
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cards = []
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for pairIndex in 0 ..< numberOfPairsOfCards {
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let content: CardContent = createCardContent(pairIndex)
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cards.append(Card(content: content, id: pairIndex * 2))
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cards.append(Card(content: content, id: pairIndex * 2 + 1))
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}
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}
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struct Card: Identifiable {
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var isFaceUp = false
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var isMatched = false
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let content: CardContent
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let id: Int
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}
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}
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extension Array {
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var oneAndOnly: Element? {
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if count == 1 {
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return first
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} else {
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return nil
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}
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}
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}
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