import "./flipper.css";
function importAll(r) {
  let obj = {};
  r.keys().forEach((key) => {
    obj[key.replace("./", "").replace(".png", "")] = r(key);
  });
  return obj;
}

const images = importAll(require.context("./", false, /\.(png|jpe?g|svg)$/));
const cardNames = "abcdefghabcdefgh";
export default class Game {
  duration = 1000;
  constructor({ containerId, onLose, onWon }) {
    Object.assign(this, {
      container: document.getElementById(containerId),
      onLose,
      onWon,
    });

    this.addBg();
    this.init();
  }
  init() {
    Object.assign(this, {
      steps: 25,
      score: 0,
    });
    this.shuffleCards();
    this.update();
  }
  update() {
    this.scoreEl.textContent = this.score;
    this.stepEl.textContent = this.steps;
  }
  setSize() {
    Object.assign(this, {
      width: this.container.clientWidth,
      height: this.container.clientHeight,
    });
    this.scoreEl.style.fontSize = (this.width / 2160) * 100 + "px";
    this.scoreEl.style.lineHeight = (this.width / 2160) * 116 + "px";
    this.stepEl.style.fontSize = (this.width / 2160) * 100 + "px";
    this.stepEl.style.lineHeight = (this.width / 2160) * 116 + "px";
  }
  addBg() {
    this.scoreEl = document.createElement("div");
    this.scoreEl.className = "meta l";
    this.stepEl = document.createElement("div");
    this.stepEl.className = "meta r";
    const bg = document.createElement("div");
    bg.className = "flipper";
    this.cardsContainer = bg;
    this.container.appendChild(bg);
    this.setSize();
    bg.appendChild(this.scoreEl);
    bg.appendChild(this.stepEl);
    this.resizeListener = window.addEventListener("resize", () => {
      this.setSize();
    });
    this.cards = Array.from(cardNames).map((name) => {
      const url = images[name];
      const card = document.createElement("div");
      card.className = "card";
      card.setAttribute("data-name", name);
      const front = document.createElement("div");
      front.className = "front";
      front.style.backgroundImage = `url(${url})`;
      card.appendChild(front);
      const back = document.createElement("div");
      back.className = "back";
      card.appendChild(back);
      return card;
    });
    this.cards.forEach((card) => {
      this.cardsContainer.appendChild(card);
    });
    this.cards.forEach((card) => {
      card.addEventListener("click", this.flip.bind(this, card));
    });
  }
  pause() {}
  resume() {}
  restart() {
    this.init();
  }
  dispose() {
    window.removeEventListener("resize", this.resizeListener);
  }
  shuffleCards() {
    this.cards.forEach((card) => {
      const randomNumber = Math.floor(Math.random() * this.cards.length) + 1;

      card.classList.remove("has-match");
      card.classList.remove("flipped");
      setTimeout(() => {
        card.style.order = `${randomNumber}`;
      }, 400);
    });
  }

  checkAllCards() {
    if (this.cards.every((card) => card.classList.contains("has-match"))) {
      this.onWon && this.onWon();
      setTimeout(() => {
        this.restart();
      }, this.duration);
    }
  }

  stopEvent() {
    this.cardsContainer.classList.add("no-event");

    setTimeout(() => {
      this.cardsContainer.classList.remove("no-event");
    }, this.duration);
  }

  checkIfMatched(firstCard, secondCard) {
    if (firstCard.dataset.name === secondCard.dataset.name) {
      this.score += 20;
      firstCard.classList.remove("flipped");
      secondCard.classList.remove("flipped");

      firstCard.classList.add("has-match");
      secondCard.classList.add("has-match");

      this.checkAllCards();
    } else {
      setTimeout(() => {
        firstCard.classList.remove("flipped");
        secondCard.classList.remove("flipped");
      }, this.duration);
    }
  }

  flip(selectedCard) {
    this.steps--;
    if (this.steps < 0) {
      this.onLose && this.onLose();
      this.restart();
    }
    selectedCard.classList.add("flipped");

    const flippedCards = this.cards.filter((card) =>
      card.classList.contains("flipped")
    );

    if (flippedCards.length === 2) {
      this.stopEvent();
      this.checkIfMatched(flippedCards[0], flippedCards[1]);
    }
    this.update();
  }
}