/**
 * LInE - Free Education, Private Data
 *
 * iFractions GAME STATE
 *
 * Name of game state : 'circleOne'
 * Shape : circle
 * Character : kid/balloon
 * Theme : flying in a balloon
 * Concept : 'How much the kid has to walk to get to the balloon?'
 * Represent fractions as : circles
 *
 * # of different difficulties : 5
 *
 * Game modes can be : 'A' or 'B' (in variable 'gameMode')
 *
 *   A : Player can place balloon position
 *       Place balloon in position (so the kid can get to it)
 *   B : Player can select # of circles
 *       Selects number of circles (that represent distance kid needs to walk to get to the balloon)
 *
 * Operations can be : 'Plus', 'Minus' or 'Mixed' (in variable 'gameOperation')
 *
 *   Plus : addition of fractions
 *     Represented by : kid going to the right (floor positions 0..5)
 *   Minus : subtraction of fractions
 *     Represented by: kid going to the left (floor positions 5..0)
 *   Mixed : Mix addition and subtraction of fractions in same
 *     Represented by: kid going to the left (floor positions 0..5)
 *
 * @namespace
 */
const circleOne = {

  /**
   * Main code
   */
  create: function () {
    // CONTROL VARIABLES
    this.availableAnimations = [];
    this.changeAnimationFrames = undefined;
    this.checkAnswer = false; // Check kid inside ballon's basket
    this.animate = false; // Start move animation
    this.animateEnding = false; // Start ballon fly animation
    this.hasClicked = false; // Air ballon positioned
    this.result = false; // Game is correct
    this.count = 0;

    this.divisorsList = ''; // Used in postScore()

    let hasBaseDifficulty = false; // Will validate that level isnt too easy (has at least one '1/difficulty' fraction)

    const startX = (gameOperation == 'Minus') ? 66 + 5 * 156 : 66;  // Initial 'x' coordinate for the kid and the baloon
    this.correctX = startX; // Ending position, accumulative

    // BACKGROUND

    // Add background image
    game.add.image(0, 0, 'bgimage');
    // Add clouds
    game.add.image(300, 100, 'cloud');
    game.add.image(660, 80, 'cloud');
    game.add.image(110, 85, 'cloud', 0.8);

    // Add floor of grass
    for (let i = 0; i < 9; i++) { game.add.image(i * 100, defaultHeight - 100, 'floor'); }

    // Road
    this.road = game.add.image(47, 515, 'road', 1.01, 0.94);

    // Road points
    const distanceBetweenPoints = 156; // Distance between road points

    for (let i = 0; i <= 5; i++) {
      game.add.image(66 + i * distanceBetweenPoints, 526, 'place_off', 0.3).anchor(0.5, 0.5);
      game.add.text(66 + i * distanceBetweenPoints, 560, i, textStyles.h2_blue);
    }

    this.trace = game.add.geom.rect(startX - 1, 526, 1, 1, undefined, 1);
    this.trace.alpha = 0;

    // Calls function that loads navigation icons

    // FOR MOODLE
    if (moodle) {
      navigationIcons.func_addIcons(
        false, false, false, // Left buttons
        true, false,         // Right buttons
        false, false
      );
    } else {
      navigationIcons.func_addIcons(
        true, true, true, // Left buttons
        true, false,      // Right buttons
        'customMenu', this.func_viewHelp
      );
    }

    // CIRCLES AND FRACTIONS
    this.circles = {
      all: [],       // Circles objects of current level
      label: [],     // Fractions labels

      diameter: 60,  // (Fixed) diameter for circles
      cur: 0,        // Current circle index
      direction: [], // Circle direction : 'Right' (plus), 'Left' (minus)
      distance: [],  // Fraction of distance between circles (used in walking animation)
      angle: [],     // Angle in degrees : 90 / 180 / 270 / 360
      lineColor: [], // Circle line colors (also used for tracing on floor)

      direc: [],     // Can be : 1 or -1 : will be multiplied to values to easily change object direction when needed
    };

    this.balloonPlace = defaultWidth / 2; // Balloon place

    // Number of circles
    const max = (gameOperation == 'Mixed' || gameMode == 'B') ? 6 : mapPosition + 1;
    const min = (gameOperation == 'Mixed' && mapPosition < 2) ? 2 : mapPosition; // Mixed level has at least 2 fractions
    const total = game.math.randomInRange(min, max); // Total number of circles

    // gameMode 'B' exclusive variables
    this.fractionIndex = -1; // Index of clicked circle (game B)
    this.numberOfPlusFractions = game.math.randomInRange(1, total - 1);

    // CIRCLES
    const levelDirection = (gameOperation == 'Minus') ? -1 : 1;
    const x = startX + 65 * levelDirection;

    for (let i = 0; i < total; i++) {

      const divisor = game.math.randomInRange(1, gameDifficulty); // Set fraction 'divisor' (depends on difficulty)

      if (divisor == gameDifficulty) hasBaseDifficulty = true; // True if after for ends has at least 1 '1/difficulty' fraction

      this.divisorsList += divisor + ','; // Add this divisor to the list of divisors (for postScore())

      // Set each circle direction
      let direction;

      switch (gameOperation) {
        case 'Plus': direction = 'Right'; break;
        case 'Minus': direction = 'Left'; break;
        case 'Mixed':
          if (i < this.numberOfPlusFractions) direction = 'Right';
          else direction = 'Left';
          break;
      }
      this.circles.direction[i] = direction;

      // Set each circle color
      let lineColor, anticlockwise;

      if (direction == 'Right') {
        lineColor = colors.darkBlue;
        this.circles.direc[i] = 1;
        anticlockwise = true;
      } else {
        lineColor = colors.red;
        this.circles.direc[i] = -1;
        anticlockwise = false;
      }
      this.circles.lineColor[i] = lineColor;

      // Draw circles 
      let circle, label = [];

      if (divisor == 1) {
        circle = game.add.geom.circle(startX, 490 - i * this.circles.diameter, this.circles.diameter,
          lineColor, 2, colors.white, 1);

        circle.anticlockwise = anticlockwise;

        this.circles.angle.push(360);

        if (fractionLabel) {
          label[0] = game.add.text(x, 490 - i * this.circles.diameter, divisor, textStyles.h2_blue);
          this.circles.label.push(label);
        }
      } else {
        let degree = 360 / divisor;

        if (direction == 'Right') degree = 360 - degree; // Anticlockwise equivalent

        circle = game.add.geom.arc(startX, 490 - i * this.circles.diameter, this.circles.diameter,
          0, game.math.degreeToRad(degree), anticlockwise,
          lineColor, 2, colors.white, 1);

        this.circles.angle.push(degree);

        if (fractionLabel) {
          label[0] = game.add.text(x, 480 - i * this.circles.diameter + 32, divisor, textStyles.h4_blue);
          label[1] = game.add.text(x, 488 - i * this.circles.diameter, '1', textStyles.h4_blue);
          label[2] = game.add.text(x, 488 - i * this.circles.diameter, '___', textStyles.h4_blue);
          this.circles.label.push(label);
        }
      }

      circle.rotate = 90;

      // If game is type B (select fractions)
      if (gameMode == 'B') {
        circle.alpha = 0.5;
        circle.index = i;
      }
      this.circles.distance.push(Math.floor(distanceBetweenPoints / divisor));
      this.circles.all.push(circle);

      this.correctX += Math.floor(distanceBetweenPoints / divisor) * this.circles.direc[i];
    }

    // Calculate next circle
    this.nextX = startX + this.circles.distance[0] * this.circles.direc[0];

    // Check if need to restart
    this.restart = false;

    // If top circle position is out of bounds (when on the ground) or game doesnt have base difficulty, restart
    if (this.correctX < 66 || this.correctX > 66 + 3 * 260 || !hasBaseDifficulty) {
      this.restart = true;
    }

    // If game is type B, selectiong a random balloon place
    if (gameMode == 'B') {
      this.balloonPlace = startX;
      this.endIndex = game.math.randomInRange(this.numberOfPlusFractions, this.circles.all.length);

      for (let i = 0; i < this.endIndex; i++) {
        this.balloonPlace += this.circles.distance[i] * this.circles.direc[i];
      }

      // If balloon position is out of bounds, restart
      if (this.balloonPlace < 66 || this.balloonPlace > 66 + 5 * distanceBetweenPoints) {
        this.restart = true;
      }
    }

    // KID
    this.availableAnimations['Right'] = ['Right', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11], 4];
    this.availableAnimations['Left'] = ['Left', [23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12], 4];

    this.kid = game.add.sprite(startX, 495 - this.circles.all.length * this.circles.diameter, 'kid_walk', 0, 0.8);
    this.kid.anchor(0.5, 0.8);
    if (gameOperation == 'Minus') {
      this.kid.animation = this.availableAnimations['Left'];
      this.kid.curFrame = 23;
    } else {
      this.kid.animation = this.availableAnimations['Right'];
    }

    // BALLOON
    this.balloon = game.add.image(this.balloonPlace, 350, 'balloon', 1, 0.5);
    this.balloon.alpha = 0.5;
    this.balloon.anchor(0.5, 0.5);

    this.basket = game.add.image(this.balloonPlace, 472, 'balloon_basket');
    this.basket.anchor(0.5, 0.5);

    // Help pointer
    this.help = game.add.image(0, 0, 'help_pointer', 0.5);
    this.help.anchor(0.5, 0);
    this.help.alpha = 0;

    if (!this.restart) {
      game.timer.start(); // Set a timer for the current level (used in postScore())
      game.event.add('click', this.func_onInputDown);
      game.event.add('mousemove', this.func_onInputOver);
    }
  },

  /**
   * Game loop
   */
  update: function () {
    self.count++;

    // Start animation
    if (self.animate) {
      let cur = self.circles.cur;
      let direc = self.circles.direc[cur];

      if (self.count % 2 == 0) { // Lowers animation
        // Move kid
        self.kid.x += 2 * direc;

        // Move circles
        for (let i in self.circles.all) {
          self.circles.all[i].x += 2 * direc;
        }

        // Manage line on the floor
        self.trace.width += 2 * direc;
        self.trace.lineColor = self.circles.all[cur].lineColor;

        // Change angle of current arc
        self.circles.angle[cur] += 4.6 * direc;
        self.circles.all[cur].angleEnd = game.math.degreeToRad(self.circles.angle[cur]);

        // When finish current circle
        let lowerCircles;
        if (self.circles.direction[cur] == 'Right') {
          lowerCircles = self.circles.all[cur].x >= self.nextX;
        }
        else if (self.circles.direction[cur] == 'Left') {

          lowerCircles = self.circles.all[cur].x <= self.nextX;

          // If just changed from 'right' to 'left' inform to change direction of kid animation
          if (self.changeAnimationFrames == undefined && cur > 0 && self.circles.direction[cur - 1] == 'Right') {
            self.changeAnimationFrames = true;
          }
        }

        // Change direction of kid animation
        if (self.changeAnimationFrames) {
          self.changeAnimationFrames = false;

          game.animation.stop(self.kid.animation[0]);

          self.kid.animation = self.availableAnimations['Left'];
          self.kid.curFrame = 23;

          game.animation.play(self.kid.animation[0]);
        }

        if (lowerCircles) {
          self.circles.all[cur].alpha = 0; // Cicle disappear
          self.circles.all.forEach(cur => {
            cur.y += self.circles.diameter; // Lower circles
          });
          self.kid.y += self.circles.diameter; // Lower kid

          self.circles.cur++; // Update current circle

          cur = self.circles.cur;
          direc = self.circles.direc[cur];

          self.nextX += self.circles.distance[cur] * direc; // Update next position
        }

        // When finish all circles (final position)
        if (cur == self.circles.all.length || self.circles.all[cur].alpha == 0) {
          self.animate = false;
          self.checkAnswer = true;
        }
      }
    }

    // Check if kid is inside the basket
    if (self.checkAnswer) {
      game.timer.stop();

      game.animation.stop(self.kid.animation[0]);

      if (self.func_checkOverlap(self.basket, self.kid)) {
        self.result = true; // Answer is correct
        self.kid.curFrame = (self.kid.curFrame < 12) ? 24 : 25;
        if (audioStatus) game.audio.okSound.play();
        game.add.image(defaultWidth / 2, defaultHeight / 2, 'ok').anchor(0.5, 0.5);
        completedLevels++;
        if (debugMode) console.log('completedLevels = ' + completedLevels);
      } else {
        self.result = false; // Answer is incorrect
        if (audioStatus) game.audio.errorSound.play();
        game.add.image(defaultWidth / 2, defaultHeight / 2, 'error').anchor(0.5, 0.5);
      }

      self.postScore();

      self.animateEnding = true;
      self.checkAnswer = false;

      self.count = 0;
    }

    // Balloon flying animation
    if (self.animateEnding) {
      self.balloon.y -= 2;
      self.basket.y -= 2;

      if (self.result) self.kid.y -= 2;

      if (self.count >= 140) {
        if (self.result) mapMove = true;
        else mapMove = false;

        game.state.start('map');
      }
    }

    game.render.all();
  },


  /* EVENT HANDLER */

  /**
   * Called by mouse click event
   *
   * @param {object} mouseEvent contains the mouse click coordinates
   */
  func_onInputDown: function (mouseEvent) {
    const x = mouseEvent.offsetX;
    const y = mouseEvent.offsetY;

    // GAME MODE A : click road
    if (gameMode == 'A') {
      const cur = self.road;

      const valid = y > 60 && (x >= cur.xWithAnchor && x <= (cur.xWithAnchor + cur.width * cur.scale));
      if (valid) self.func_clicked(x);
    }

    // GAME MODE B : click circle
    if (gameMode == 'B') {
      self.circles.all.forEach(cur => {
        const valid = game.math.distanceToPointer(x, cur.xWithAnchor, y, cur.yWithAnchor) <= (cur.diameter / 2) * cur.scale;
        if (valid) self.func_clicked(cur);
      });
    }

    navigationIcons.func_onInputDown(x, y);

    game.render.all();
  },

  /**
   * Called by mouse move event
   *
   * @param {object} mouseEvent contains the mouse move coordinates
   */
  func_onInputOver: function (mouseEvent) {
    const x = mouseEvent.offsetX;
    const y = mouseEvent.offsetY;
    let flag = false;

    // GAME MODE A : balloon follow mouse
    if (gameMode == 'A' && !self.hasClicked) {
      if (game.math.distanceToPointer(x, self.balloon.x, y, self.balloon.y) > 8) {
        self.balloon.x = x;
        self.basket.x = x;
      }

      document.body.style.cursor = 'auto';
    }

    // GAME MODE B : hover circle
    if (gameMode == 'B' && !self.hasClicked) {
      self.circles.all.forEach(cur => {
        const valid = game.math.distanceToPointer(x, cur.xWithAnchor, y, cur.yWithAnchor) <= (cur.diameter / 2) * cur.scale;
        if (valid) {
          self.func_overCircle(cur);
          flag = true;
        }
      });
      if (!flag) self.func_outCircle();
    }

    navigationIcons.func_onInputOver(x, y);

    game.render.all();
  },

  /* CALLED BY EVENT HANDLER */

  /**
   * (in gameMode 'B') <br>
   * 
   * Function called when cursor is over a valid circle
   * 
   * @param {object} cur circle the cursor is over
   */
  func_overCircle: function (cur) {
    if (!self.hasClicked) {
      document.body.style.cursor = 'pointer';
      for (let i in self.circles.all) {
        self.circles.all[i].alpha = (i <= cur.index) ? 1 : 0.5;
      }
    }
  },

  /**
   * (in gameMode 'B') <br>
   * 
   * Function called when cursor is out of a valid circle
   */
  func_outCircle: function () {
    if (!self.hasClicked) {
      document.body.style.cursor = 'auto';
      self.circles.all.forEach(cur => {
        cur.alpha = 0.5;
      });
    }
  },

  /**
   * (in gameMode 'B') <br>
   * 
   * Function called when player clicked over a valid circle
   * 
   * @param {number|object} cur clicked circle
   */
  func_clicked: function (cur) {
    if (!self.hasClicked) {

      // On gameMode A
      if (gameMode == 'A') {
        self.balloon.x = cur;
        self.basket.x = cur;
        // On gameMode B
      }
      else if (gameMode == 'B') {

        document.body.style.cursor = 'auto';

        for (let i in self.circles.all) {
          if (i <= cur.index) {
            self.circles.all[i].alpha = 1; // Keep selected circle
            self.fractionIndex = cur.index;
          } else {
            self.circles.all[i].alpha = 0;   // Hide unselected circle
            self.kid.y += self.circles.diameter;  // Lower kid to selected circle
          }
        }
      }

      if (audioStatus) game.audio.beepSound.play();

      // Hide fractions
      if (fractionLabel) {
        self.circles.label.forEach(cur => {
          cur.forEach(cur => { cur.alpha = 0; });
        });
      }

      // Hide solution pointer
      if (self.help != undefined) self.help.alpha = 0;

      self.balloon.alpha = 1;
      self.trace.alpha = 1;

      self.hasClicked = true;
      self.animate = true;

      game.animation.play(this.kid.animation[0]);
    }
  },

  /* GAME FUNCTIONS */

  /**
   * Checks if 2 images overlap
   * 
   * @param {object} spriteA image 1
   * @param {object} spriteB image 2
   * @returns {boolean}
   */
  func_checkOverlap: function (spriteA, spriteB) {
    const xA = spriteA.x;
    const xB = spriteB.x;

    // Consider it comming from both sides
    if (Math.abs(xA - xB) > 14) return false;
    else return true;
  },

  /**
   * Display correct answer
   */
  func_viewHelp: function () {
    if (!self.hasClicked) {
      // On gameMode A
      if (gameMode == 'A') {
        self.help.x = self.correctX;
        self.help.y = 490;
        // On gameMode B
      } else {
        self.help.x = self.circles.all[self.endIndex - 1].x;
        self.help.y = self.circles.all[self.endIndex - 1].y - self.circles.diameter / 2;
      }
      self.help.alpha = 0.7;
    }
  },

  /* METADATA FOR GAME */

  /**
   * Saves players data after level ends - to be sent to database <br>
   * 
   * Attention: the "line_" prefix data table must be compatible to data table fields (MySQL server)
   * @see /php/squareOne.js
   */
  postScore: function () {
    // Creates string that is going to be sent to db
    const data = '&line_game=' + gameShape
      + '&line_mode=' + gameMode
      + '&line_oper=' + gameOperation
      + '&line_leve=' + gameDifficulty
      + '&line_posi=' + mapPosition
      + '&line_resu=' + self.result
      + '&line_time=' + game.timer.elapsed
      + '&line_deta='
      + 'numCircles:' + self.circles.all.length
      + ', valCircles: ' + self.divisorsList
      + ' balloonX: ' + self.basket.x
      + ', selIndex: ' + self.fractionIndex;

    // FOR MOODLE
    if (moodle) sendToDB(data, self.result, game.timer.elapsed);
    else sendToDB(data);
  }
};