From 2a1bf9bf871ff0354f05fa8cdfdfe11cc3bfad2f Mon Sep 17 00:00:00 2001
From: MayteApolix <83069108+MayteApolix@users.noreply.github.com>
Date: Sun, 9 Jan 2022 17:31:41 +0100
Subject: filled board and basic legal move checking

---
 draughts/game.js                     |  19 ++++
 draughts/public/javascripts/board.js | 162 +++++++++++++++++++++++++++++++++++
 2 files changed, 181 insertions(+)
 create mode 100644 draughts/game.js
 create mode 100644 draughts/public/javascripts/board.js

diff --git a/draughts/game.js b/draughts/game.js
new file mode 100644
index 0000000..40b0c1d
--- /dev/null
+++ b/draughts/game.js
@@ -0,0 +1,19 @@
+const websocket = requre("ws");
+
+const game = function(gameID){
+    this.playerRed;
+    this.playerBlue;
+    this.id = gameID;
+    this.gameState = "0 JOINT";
+}
+
+game.prototype.transitionStates = { 
+    "0 JOINT": 0, 
+    "1 JOINT": 1, 
+    "2 JOINT": 2,
+    "Red": 3,  //Red won
+    "Blue": 4, //Blue won
+    "ABORTED": 5
+  };
+
+  
\ No newline at end of file
diff --git a/draughts/public/javascripts/board.js b/draughts/public/javascripts/board.js
new file mode 100644
index 0000000..13b15a0
--- /dev/null
+++ b/draughts/public/javascripts/board.js
@@ -0,0 +1,162 @@
+var board = new Array(10).fill(null).map(()=>new Array(10).fill(null));
+
+
+var start = function(){
+    // set up blue pieces
+    let blueCount = 1;
+    for (var i = 0; i < 4; i++){
+        if (i % 2 == 0){
+            for (var j = 0; j < board[i].length; j += 2){
+                board[i][j] = new Piece(blueCount, i, j, blue);
+                blueCount++;
+            }
+        } else {
+            for (var j = 1; j < board[i].length; j += 2) {
+                board[i][j] = new Piece(blueCount, i, j, blue);
+                blueCount++;
+            }
+        }
+    }
+    
+    // set up red pieces
+    let redCount = 1;
+    for (var i = 6; i < 10; i++){
+        if (i % 2 == 0){
+            for (var j = 0; j < board[i].length; j += 2){
+                board[i][j] = new Piece(redCount, i, j, red);
+                redCount++;
+            }
+        } else {
+            for (var j = 1; j < board[i].length; j += 2) {
+                board[i][j] = new Piece(redCount, i, j, red);
+                redCount++;
+            }
+        }
+    }
+    
+    return board;
+}
+
+function Piece(id, column, row, color){
+    this.id = id;
+    this.position = {column, row};
+    this.color = color;
+    this.king = false;
+    this.selected = false;
+}
+
+Piece.prototype.getColor = function(){
+    return this.color;
+}
+
+Piece.prototype.getPosition = function(){
+    return this.position;
+}
+
+Piece.prototype.isKing = function(){
+    return this.king;
+}
+
+Piece.prototype.setKing = function(){
+    this.king = true;
+}
+
+Piece.prototype.movePiece = function(direction){
+    let x = direction[0];
+    let y = direction[1];
+    if (x + 1 <= 9 && x - 1 >= 0 && y + 1 <= 9 && y - 1 >= 0){
+        this.position = direction;
+    }
+}
+
+// check if all adjacent tiles are on the board
+function directions(x, y){
+    return forwardDirections(x, y).concat(backwardDirections(x, y));
+}
+
+function forwardDirections(x, y){
+    let directions = [];
+    if (x + 1 <= 9){
+        if (y + 1 <= 9) directions.push(x + 1, y + 1)
+        if (y - 1 >= 0) directions.push(x + 1, y - 1)
+    }
+    return directions;
+}
+
+function backwardDirections(x, y){
+    let directions = [];
+    if (x - 1 >= 0){
+        if (y + 1 <= 9) directions.push(x - 1, y + 1);
+        if (y - 1 >= 0) directions.push(x - 1, y - 1);
+    }
+
+    return directions;
+}
+
+Piece.prototype.getPossibleMoves = function(){
+    let possibleMoves = [];
+    let directions = directions(this.positions[0], this.positions[1]);
+    for (let i = 0; i < directions.length; i++){
+        let direction = directions[i];
+        let hit = checkHit(direction, piece);
+        let shift = checkShift(direction, piece); 
+        if (hit != null){
+            possibleMoves.push(hit);
+        }
+        if (shift != null){
+            possibleMoves.pish(shift);
+        }
+    }
+
+
+    return possibleMoves;
+}
+
+function checkShift(direction, piece){
+    const delta_y = piece.getPosition[1] - direction[1];
+
+    // check if it is a forward move
+    if (delta_y > 0){
+        // check if square is empty
+        if (board[direction[0], direction[1]] == null){
+            return new Move(piece, direction, null);
+        }
+        
+    } else {
+        if (piece.isKing){
+            if (board[direction[0], direction[1]] == null){
+                return new Move(piece, direction, null);
+            }
+        }
+    }
+}
+
+function checkHit(direction, piece){
+    let hits = [];
+    let opponent = board[direction[0], direction[1]];
+
+    // check whether the square in this direction is empty and if its an enemy piece
+    if (opponent != null && opponent.getColor != piece.getColor){
+        // Check whether there is a square to move to
+        let delta_x = direction[0] - piece.getPosition[0];
+        let delta_y = direction[1] - piece.getPosition[1];
+
+        if (board[direction[0]+ delta_x][direction[0] + delta_y] == null){
+            hits.push(opponent);
+
+            return new Move(piece, direction[0]+ delta_x, direction[0] + delta_y, hits)
+            // TODO implement functionality for multiple hits
+        }
+    }
+}
+
+
+function Move(piece, newPosition, hits){
+    this.piece = piece;
+    this.newPosition = newPosition
+    this.hits = hits;
+}
+
+Move.prototype.getNoHits = function(){
+    return hits.length;
+}
\ No newline at end of file
-- 
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