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function HTMLActuator() {
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    this.tileContainer    = document.querySelector(".tile-container");
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    this.scoreContainer   = document.querySelector(".score-container");
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    this.bestContainer    = document.querySelector(".best-container");
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    this.messageContainer = document.querySelector(".game-message");
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    this.sharingContainer = document.querySelector(".score-sharing");
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    this.score = 0;
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  }
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  HTMLActuator.prototype.actuate = function (grid, metadata) {
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    var self = this;
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    window.requestAnimationFrame(function () {
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      self.clearContainer(self.tileContainer);
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      grid.cells.forEach(function (column) {
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        column.forEach(function (cell) {
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          if (cell) {
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            self.addTile(cell);
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          }
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        });
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      });
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      self.updateScore(metadata.score);
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      self.updateBestScore(metadata.bestScore);
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      if (metadata.terminated) {
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        if (metadata.over) {
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          self.message(false); // You lose
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        } else if (metadata.won) {
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          self.message(true); // You win!
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        }
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      }
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    });
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  };
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  // Continues the game (both restart and keep playing)
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  HTMLActuator.prototype.continue = function () {
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    this.clearMessage();
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  };
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  HTMLActuator.prototype.clearContainer = function (container) {
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    while (container.firstChild) {
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      container.removeChild(container.firstChild);
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    }
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  };
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  HTMLActuator.prototype.addTile = function (tile) {
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    var self = this;
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    var wrapper   = document.createElement("div");
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    var inner     = document.createElement("div");
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    var position  = tile.previousPosition || { x: tile.x, y: tile.y };
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    var positionClass = this.positionClass(position);
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    // We can't use classlist because it somehow glitches when replacing classes
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    var classes = ["tile", "tile-" + tile.value, positionClass];
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    if (tile.value > 2048) classes.push("tile-super");
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    this.applyClasses(wrapper, classes);
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    inner.classList.add("tile-inner");
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    inner.textContent = tile.value;
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    if (tile.previousPosition) {
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      // Make sure that the tile gets rendered in the previous position first
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      window.requestAnimationFrame(function () {
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        classes[2] = self.positionClass({ x: tile.x, y: tile.y });
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        self.applyClasses(wrapper, classes); // Update the position
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      });
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    } else if (tile.mergedFrom) {
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      classes.push("tile-merged");
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      this.applyClasses(wrapper, classes);
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      // Render the tiles that merged
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      tile.mergedFrom.forEach(function (merged) {
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        self.addTile(merged);
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      });
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    } else {
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      classes.push("tile-new");
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      this.applyClasses(wrapper, classes);
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    }
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    // Add the inner part of the tile to the wrapper
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    wrapper.appendChild(inner);
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    // Put the tile on the board
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    this.tileContainer.appendChild(wrapper);
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  };
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  HTMLActuator.prototype.applyClasses = function (element, classes) {
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    element.setAttribute("class", classes.join(" "));
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  };
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  HTMLActuator.prototype.normalizePosition = function (position) {
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    return { x: position.x + 1, y: position.y + 1 };
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  };
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  HTMLActuator.prototype.positionClass = function (position) {
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    position = this.normalizePosition(position);
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    return "tile-position-" + position.x + "-" + position.y;
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  };
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  HTMLActuator.prototype.updateScore = function (score) {
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    this.clearContainer(this.scoreContainer);
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    var difference = score - this.score;
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    this.score = score;
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    this.scoreContainer.textContent = this.score;
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    if (difference > 0) {
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      var addition = document.createElement("div");
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      addition.classList.add("score-addition");
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      addition.textContent = "+" + difference;
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      this.scoreContainer.appendChild(addition);
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    }
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  };
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  HTMLActuator.prototype.updateBestScore = function (bestScore) {
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    this.bestContainer.textContent = bestScore;
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  };
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  HTMLActuator.prototype.message = function (won) {
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    var type    = won ? "game-won" : "game-over";
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    var message = won ? "You win!" : "Game over!";
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    this.messageContainer.classList.add(type);
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    this.messageContainer.getElementsByTagName("p")[0].textContent = message;
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    this.clearContainer(this.sharingContainer);
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    this.sharingContainer.appendChild(this.scoreTweetButton());
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    twttr.widgets.load();
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  };
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  HTMLActuator.prototype.clearMessage = function () {
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    // IE only takes one value to remove at a time.
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    this.messageContainer.classList.remove("game-won");
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    this.messageContainer.classList.remove("game-over");
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  };
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  HTMLActuator.prototype.scoreTweetButton = function () {
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    var tweet = document.createElement("a");
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    tweet.classList.add("twitter-share-button");
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    tweet.setAttribute("href", "https://twitter.com/share");
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    tweet.setAttribute("data-via", "3kh0");
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    tweet.setAttribute("data-url", "http://git.io/lrmEpA");
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    tweet.setAttribute("data-counturl", "http://3kh0.github.io/");
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    tweet.textContent = "Tweet";
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    var text = "I scored " + this.score + " points at 1, a game where you " +
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               "join numbers to score high! #1game";
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    tweet.setAttribute("data-text", text);
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    return tweet;
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  };
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