import Phaser from "phaser";
import tiles from "../assets/tiles.png";
import bg from "../assets/bg.jpg";
import gridTile from "../assets/gridTile.png";

const gameWidth = 924;
const tileSpace = 3;
const offsetLeft = (1080 - gameWidth) / 2;
const offsetTop = 200;
const columns = 9;
const rows = 20;
const getRandom = () => Math.floor(Math.random() * 5);
const getValues = () =>
  Phaser.Utils.Array.Shuffle([
    0,
    1,
    2,
    3,
    4,
    getRandom(),
    getRandom(),
    getRandom(),
    getRandom(),
  ]);
const tileSize = (gameWidth - tileSpace * (columns - 1)) / columns;
export default class Rect extends Phaser.Scene {
  constructor() {
    super({ key: "Rect" });
    this.gameOptions = {
      // number of columns
      columns,

      // number of rows, must be high enough to allow object pooling
      rows,

      // tile speed in pixels per second
      tileSpeed: 100,
    };
  }
  preload() {
    this.load.image("bg", bg);
    this.load.image("gridTile", gridTile);
    this.load.spritesheet("tiles", tiles, {
      frameWidth: 202,
      frameHeight: 202,
    });
  }
  create() {
    this.bg = this.add.image(
      this.game.config.width / 2,
      this.game.config.height / 2,
      "bg"
    );
    this.bg.displayWidth = this.game.config.width;
    this.bg.displayHeight = this.game.config.height;

    // physics group which manages all tiles in game
    this.tileGroup = this.physics.add.group();
    const shape = this.make.graphics();
    shape.beginPath();
    shape.moveTo(0, offsetTop);
    shape.lineTo(1080, offsetTop);
    shape.lineTo(1080, tileSize * 8 + tileSpace * 7 + offsetTop);
    shape.lineTo(0, tileSize * 8 + tileSpace * 7 + offsetTop);
    shape.lineTo(0, offsetTop);
    shape.fillPath();

    const mask = shape.createGeometryMask();
    mask.setInvertAlpha(true);
    for (let i = 0; i < this.gameOptions.columns; i++) {
      for (let j = 0; j < 8; j++) {
        const defaultTile = this.add.image(
          offsetLeft + i * (tileSize + tileSpace),
          offsetTop + j * (tileSize + tileSpace),
          "gridTile"
        );
        defaultTile.setOrigin(0);
        defaultTile.displayWidth = tileSize;
        defaultTile.displayHeight = tileSize;
      }
    }
    // time to add tiles to the game
    for (let i = 0; i < this.gameOptions.rows; i++) {
      // build an array with integers between 0 and this.gameOptions.columns - 1: [0, 1, 2, ..., this.gameOptions.columns - 1]
      let values = getValues();

      // save middle column color of first row
      if (i == 0) {
        var middleColor = values[Math.floor(this.gameOptions.columns / 2)];
      }

      // now we place the tiles, row by row
      for (let j = 0; j < this.gameOptions.columns; j++) {
        // add a tile. Tile frame is set according to "values" shuffled array
        let tile = this.tileGroup.create(
          offsetLeft + j * (tileSize + tileSpace),
          i * (tileSize + tileSpace) + (this.game.config.height / 4) * 3,
          "tiles",
          values[j]
        );
        tile.setMask(mask);
        // call adjustTile method to adjust tile origin and display size
        this.adjustTile(tile);
      }
    }

    // let's build once again an array with integers between 0 and this.gameOptions.columns - 1
    let values = getValues();

    // remove the item at "middlecolor" position because we don't want it to be randomly selected
    values = values.filter((v) => middleColor != v);

    // add the player to the this.this.game. Player color is picked amoung "values" array items, which does not contain anymore "middlecolor" value
    this.player = this.tileGroup.create(
      offsetLeft +
        (tileSize + tileSpace) * Math.floor(this.gameOptions.columns / 2),
      (this.game.config.height / 4) * 3 - (tileSize + tileSpace),
      "tiles",
      Phaser.Utils.Array.GetRandom(values)
    );
    this.player.setMask(mask);
    // adjust player origin and display size
    this.adjustTile(this.player);

    // the score
    this.score = 0;

    // add score text
    this.scoreText = this.add.text(20, 20, "", {
      fontSize: 20,
    });
    this.scoreText.text = "Game Score: " + this.score;

    // move entire tile group up by this.gameOptions.tileSpeed pixels / second
    this.tileGroup.setVelocityY(-this.gameOptions.tileSpeed);

    // can the player move? Yes, at the moment
    this.canMove = true;

    // did we match any tile? No, at the moment
    this.matched = false;

    // wait for player input
    this.input.off("pointerdown");
    this.input.on("pointerdown", this.moveTile, this);
  }
  // method to be executed at each frame
  update() {
    // if the player touches the top of the screen...
    if (this.player.y < offsetTop) {
      // gmae over man, restart the this.game
      this.game.onLose && this.game.onLose();
      this.tileGroup.setVelocityY(0);
      this.input.off("pointerdown");
      this.input.on(
        "pointerdown",
        function () {
          this.scene.start("Rect");
        },
        this
      );
    }
  }
  // method to set tile origin and display size
  adjustTile(sprite) {
    // set origin at the top left corner
    sprite.setOrigin(0);

    // set display width and height to "tileSize" pixels
    sprite.displayWidth = tileSize;
    sprite.displayHeight = tileSize;
  }

  // method to move player tile
  moveTile(pointer) {
    // if we can move...
    if (this.canMove) {
      // determine column according to input coordinate and tile size
      let column = Math.floor((pointer.x - offsetLeft) / tileSize);
      if (column > 8) column = 8;
      if (column < 0) column = 0;
      // get the ditance from current player tile and destination
      let distance = Math.floor(
        Math.abs(offsetLeft + column * (tileSize + tileSpace) - this.player.x) /
          tileSize
      );

      // did we actually move?
      if (distance > 0) {
        // we can't move anymore
        this.canMove = false;
        this.player.x = offsetLeft + column * (tileSize + tileSpace);
        this.checkMatch();
        // tween the player to destination tile
        // this.tweens.add({
        //   targets: [this.player],
        //   x: offsetLeft + column * (tileSize + tileSpace),
        //   duration: distance * 30,
        //   callbackScope: this,
        //   onComplete: function () {
        //     // at the end of the tween, check for tile match
        //     this.checkMatch();
        //   },
        // });
      }
    }
  }

  // method to check tile matches
  checkMatch() {
    // get tile below player tile
    let tileBelow = this.physics.overlapRect(
      this.player.x + tileSize / 2,
      this.player.y + tileSize * 1.5,
      1,
      1
    );

    // "tileBelow" is an array so we have to compare the first - and only - item frame with player frame. Are the two frames the same?
    if (tileBelow[0].gameObject.frame.name == this.player.frame.name) {
      // we have a match
      this.matched = true;

      // check the whole row below player tile
      let rowBelow = this.physics.overlapRect(
        0,
        this.player.y + tileSize * 1.5,
        gameWidth,
        1
      );

      // tween down the player
      this.tweens.add({
        targets: [this.player],
        y: tileBelow[0].gameObject.y,
        duration: 50,
        callbackScope: this,
        onUpdate: function (tween, target) {
          // at each update, we have to adjust player position because tiles continue moving up
          this.player.y = Math.min(this.player.y, tileBelow[0].gameObject.y);
        },

        // at the end of the tween, we have to move the row at the bottom, to reuse sprites
        onComplete: function () {
          // increment score
          this.score++;

          // update score text
          this.scoreText.setText("Game Score: " + this.score);

          // the good old array with all integers from zero to this.gameOptions.columns - 1
          let values = getValues();

          // place all tiles below the lowest row
          for (let i = 0; i < this.gameOptions.columns; i++) {
            rowBelow[i].gameObject.setFrame(values[i]);
            rowBelow[i].gameObject.y +=
              (tileSize + tileSpace) * this.gameOptions.rows;
          }

          // check for matches again, there could be a combo
          this.checkMatch();
        },
      });
    }

    // what to do when player moved but there isn't any match?
    else {
      // we can move again
      this.canMove = true;

      // is there a previous match? Did we come here from a previous match?
      if (this.matched) {
        // no more matches
        this.matched = false;

        // get the tile below the player
        let tileBelow = this.physics.overlapRect(
          this.player.x + tileSize / 2,
          this.player.y + tileSize * 1.5,
          1,
          1
        );

        // the good old array with all integers from zero to this.gameOptions.columns - 1
        let values = [0, 1, 2, 3, 4];

        // remove the item at "frame" value of tile below the player pbecause we don't want it to be randomly selected
        values.splice(tileBelow[0].gameObject.frame.name, 1);

        // change player frame
        this.player.setFrame(Phaser.Utils.Array.GetRandom(values));
      }
    }
  }
}