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              <script type="x-template" id="board-checker-template">
  <transition
    @enter="enter"
    :css="false">
    <circle
      :cx="centerX"
      :cy="centerY"
      :r="checkerRadius"
      :fill="adjustedColor"
      :fill-opacity="opacity"
      />
  </transition>
</script>

<script type="x-template" id="board-column-template">
  <svg :x="col * cellSize" y="0">
    <g @click="drop(col)" class="column">
      <board-checker
        v-for="checker in checkers"
        :key="key(checker)"
        :checker="checker"
        :cellSize="cellSize"
        :rowCount="rowCount"
        :checkerRadius="checkerRadius"
        :status="status"
        @land="land"
        />
      <rect
        :class="status"
        :key="col"
        :col="col"
        :width="cellSize"
        :height="boardHeight"
        :fill="color"
        :fill-opacity="opacity"
        :mask="mask"
        />
    </g>
  </svg>
</script>

<script type="x-template" id="game-board-template">
  <svg :viewBox="`0 0 ${boardWidth} ${boardHeight}`"
    xmlns="http://www.w3.org/2000/svg"
    class="game-board" stroke="none">
    <defs>
      <pattern :id="patternId" patternUnits="userSpaceOnUse" :width="cellSize" :height="cellSize">
        <circle :cx="cellSize / 2" :cy="cellSize / 2" :r="checkerRadius" fill="black"></circle>
      </pattern>
      <mask :id="maskId">
        <rect :width="cellSize" :height="boardHeight" fill="white"></rect>
        <rect :width="cellSize" :height="boardHeight" :fill="pattern"></rect>
      </mask>
    </defs>
    <board-column
      v-for="col in cols"
      :key="col"
      :checkers="colCheckers(col)"
      :col="col"
      :color="'cadetblue'"
      :cellSize="cellSize"
      :checkerRadius="checkerRadius"
      :boardHeight="boardHeight"
      :rowCount="rowCount"
      :mask="mask"
      :status="status"
      @drop="drop"
      @land="land"
      />
  </svg>
</script>

<script type="x-template" id="game-container-template">
  <div>
    <p>
      {{ instructions }}  
    </p>
    <game-board
      :checkers="checkers"
      :rowCount="rowCount"
      :colCount="colCount"
      :status="status"
      @drop="drop"
      @land="land"
      ></game-board>
    <p v-if="gameOver">
      {{ overMessage }}
      <a href="#" @click="reset">Play again</a>
    </p>
    <p v-else>
      {{ whoseTurn }}
    </p>
  </div>    
</script>

<div id="app">
  <h3>Connect Four</h3>
  <game-container></game-container>
</div>
            
          
!
            
              body {
  background-color: azure;
}

a {
  text-decoration: none;
}

.logo h3 {
  margin: 0;
}

.game-board {
  border: 5px cadetblue solid;

  width: 350px;
  margin: 0 auto;
}

.column {
  cursor: pointer;
}

.column rect.play:hover {
  fill-opacity: 0.75;
}

#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
}
            
          
!
            
              const range = num => [...Array(num).keys()];

const key = (row, col) => `${row}${col}`;
const cssUrl = id => `url(#${id})`;
const titleize = text => text[0].toUpperCase() + text.slice(1, text.length)
const min = num => Math.max(num - 3, 0);
const max = (num, max) => Math.min(num + 3, max);

const RED = 'red';
const BLACK = 'black';
const GREEN = 'green';
const EMPTY = 'empty';
const OVER = 'over';
const PLAY = 'play';

const BoardChecker = Vue.component('board-checker', {
  template: '#board-checker-template',
  props: ['checker', 'cellSize', 'rowCount', 'checkerRadius', 'status'],

  data() {
    return {
      colorHexes: {
        red: '#FC7E69',
        black: '#254689',
        green: 'green',
      },
    };
  },

  computed: {
    row() { return this.checker.row; },
    col() { return this.checker.col; },
    color() { return this.checker.color; },
    isWinner() { return this.checker.isWinner; },

    adjustedColor() {
      return this.colorHexes[this.color];
    },
    
    opacity() {
      return (this.status === OVER && !this.isWinner) ? 0.25 : 1.0; 
    },

    centerX() {
      return (this.cellSize / 2);
    },

    centerY() {
      return (this.cellSize / 2) + (this.cellSize * (this.rowCount - 1 - this.row));
    },

    fromY() {
      return -1 * (this.centerY + this.cellSize);
    },

    destY() {
      return 0;
    },

    percentage() {
      return (this.rowCount - this.row) / this.rowCount;
    },

    duration() {
      return 0.2 + 0.4 * this.percentage;
    },
  },

  methods: {
    enter(el, done) {
      const fromParams = { y: this.fromY };
      const destParams = {
        y: this.destY,
        ease: Bounce.easeOut,
        onComplete: () => {
          this.$emit('land');
          done();
        },
      };

      return TweenMax.fromTo(el, this.duration, fromParams, destParams);
    },
  },
});

const BoardColumn = Vue.component('board-column', {
  template: '#board-column-template',
  props: ['checkers', 'col', 'color', 'cellSize', 'boardHeight', 'checkerRadius', 'rowCount', 'mask', 'status'],

  components: {
    BoardChecker,
  },

  computed: {
    // Find the current max occupied row and add 1
    nextOpenRow() {
      return Math.max(...this.checkers.map(c => c.row).concat(-1)) + 1;
    },
    
    opacity() {
      return (this.status === OVER) ? 0.2 : 1.0;
    },
  },

  methods: {
    key({ row, col }) {
      return `${row}${col}`;
    },
    
    land() {
      this.$emit('land');
    },

    drop(col) {
      const row = this.nextOpenRow;

      if (row < this.rowCount) {
        this.$emit('drop', { row, col });
      } else {
        console.log('cannot drop', { row, col });
      }
    },
  },
});

const GameBoard = Vue.component('game-board', {
  template: '#game-board-template',
  props: ['checkers', 'rowCount', 'colCount', 'status'],
  components: {
    BoardColumn,
  },

  data() {
    return {
      patternId: 'cell-pattern',
      maskId: 'cell-mask',
      cellSize: 100,
    };
  },

  computed: {
    pattern() { return cssUrl(this.patternId); },
    mask() { return cssUrl(this.maskId); },

    rows() { return range(this.rowCount); },
    cols() { return range(this.colCount); },

    boardWidth() { return this.colCount * this.cellSize; },
    boardHeight() { return this.rowCount * this.cellSize; },
    checkerRadius() { return this.cellSize * 0.45; },
  },

  methods: {
    colCheckers(col) {
      return Object.values(this.checkers).filter(c => c.col === col)
              .sort((a, b) => a.row - b.row);
    },
    drop(data) {
      this.$emit('drop', data);
    },
    land() {
      this.$emit('land');
    },
  },
});

const GameContainer = Vue.component('game-container', {
  template: "#game-container-template",
  
  components: {
    GameBoard,
  },
  
  data() {
    return {
      checkers: {},
      isLocked: false,
      playerColor: RED,
      rowCount: 6,
      colCount: 7,
      status: PLAY,
      instructions: 'Click columns to add checkers',
      winner: undefined,
    };
  },
  
  computed: {
    overMessage() {
      if (this.winner) {
        return `${titleize(this.winner.color)} wins!`;
      } else {
        return `It's a draw!`;
      }
    },
    
    moves() {
      return Object.values(this.checkers);
    },
    
    whoseTurn() {
      return `${titleize(this.playerColor)} goes ${this.moves.length === 0 ? 'first' : 'next'}`;
    },
    
    gameOver() {
      return this.status === OVER;
    },
  },

  methods: {
    key,

    reset() {
      this.winner = undefined;
      this.isLocked = false;
      this.status = PLAY;
      this.checkers = {};
    },

    toggleColor() {
      if (this.playerColor === RED) {
        this.playerColor = BLACK;
      } else {
        this.playerColor = RED;
      }
    },
    
    setChecker({ row, col }, attrs = {}) {
      const checker = this.getChecker({ row, col });
      return Vue.set(this.checkers, key(row, col), { ...checker, ...attrs });
    },
    
    getChecker({ row, col }) {
      return this.checkers[key(row, col)] || { row, col, color: 'empty' };
    },
    
    drop({ col, row }) {
      if (this.isLocked) return;
      
      this.isLocked = true;
      const color = this.playerColor;
      
      console.log('setting checker', key(row, col), { row, col, color });
      this.setChecker({ row, col }, { color });
      
      this.checkForDraw() || this.checkForWinFrom({ row, col });
      this.toggleColor(); 
    },
    
    land() {
      if (this.isDraw) return this.displayDraw();
      
      if (this.winner) {
        this.displayWin(this.winner);
      } else {
        this.isLocked = false;
      }
    },
    
    checkForDraw() {
      this.isDraw = Object.keys(this.checkers).length === this.rowCount * this.colCount;
    },
    
    getWinner(...segment) {
      if (segment.length !== 4) return false;
      const checkers = segment.map(([row, col]) => this.getChecker({row, col}));
      const color = checkers[0].color;
      if (color === EMPTY) return false;
      if (checkers.every(c => c.color === color)) return { color, checkers };
      return false;
    },
    
    checkHorizontalSegments({ focalRow, minCol, maxCol }) {
      for (let row = focalRow, col = minCol; col <= maxCol; col++) {
        const winner = this.getWinner([row, col], [row, col+1], [row, col+2], [row, col+3]);
        if (winner) return winner;
      }    
    },
    
    checkVerticalSegments({ focalRow, focalCol, minRow, maxRow }) {
      for (let col = focalCol, row = minRow; row <= focalRow; row++) {
        const winner = this.getWinner([row, col], [row+1, col], [row+2, col], [row+3, col]);
        if (winner) return winner;
      }
    },
    
    checkForwardSlashSegments({ focalRow, focalCol, minRow, minCol, maxRow, maxCol }) {
      const startForwardSlash = (row, col) => {
        while(row > minRow && col > minCol) { row--; col--; }
        return [row, col]
      }
      for (let [row, col] = startForwardSlash(focalRow, focalCol); row <= maxRow && col <= maxCol; row++, col++) {
        const winner = this.getWinner([row, col], [row+1, col+1], [row+2, col+2], [row+3, col+3]);
        if (winner) return winner;
      }
    },

    checkBackwardSlashSegments({ focalRow, focalCol, minRow, minCol, maxRow, maxCol }) {
      const startBackwardSlash = (row, col) => {
        while(row < maxRow && col > minCol) { row++; col--; }
        return [row, col]
      }
      for (let [row, col] = startBackwardSlash(focalRow, focalCol); row >= minRow && col <= maxCol; row--, col++) {
        const winner = this.getWinner([row, col], [row-1, col+1], [row-2, col+2], [row-3, col+3]);
        if (winner) return winner;
      }
    },

    checkForWinFrom(lastChecker) {
      if (!lastChecker) return;
      const { row: focalRow, col: focalCol } = lastChecker;
      const minCol = min(focalCol);
      const maxCol = max(focalCol, this.colCount-1);
      const minRow = min(focalRow);
      const maxRow = max(focalRow, this.rowCount-1);
      const coords = { focalRow, focalCol, minRow, minCol, maxRow, maxCol };
      
      this.winner = this.checkHorizontalSegments(coords) ||
        this.checkVerticalSegments(coords) ||
        this.checkForwardSlashSegments(coords) ||
        this.checkBackwardSlashSegments(coords);
    },
    
    displayDraw() {
      this.status = OVER;
    },
       
    displayWin(winner) {
      this.winner = winner;
      this.status = OVER;
      this.winner.checkers.forEach((checker) => {
        this.setChecker(checker, {isWinner: true});
      }); 
      console.log('Win!', winner);
    },

  },
});


new Vue({
  el: '#app',
});
            
          
!
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