added game handler

backend/utils/functions.js

@@ -1,16 +1,75 @@
-const { colors } = require("./constants");
+const { colors } = require('./constants');
 function getStartPositions() {
-  const startPositions = [];
-  for (let i = 0; i < 16; i++) {
-    let pawn = {};
-    pawn.basePos = i;
-    pawn.position = i;
-    if (i < 4) pawn.color = colors[0];
-    else if (i < 8) pawn.color = colors[1];
-    else if (i < 12) pawn.color = colors[2];
-    else if (i < 16) pawn.color = colors[3];
-    startPositions.push(pawn);
-  }
-  return startPositions;
+    const startPositions = [];
+    for (let i = 0; i < 16; i++) {
+        let pawn = {};
+        pawn.basePos = i;
+        pawn.position = i;
+        if (i < 4) pawn.color = colors[0];
+        else if (i < 8) pawn.color = colors[1];
+        else if (i < 12) pawn.color = colors[2];
+        else if (i < 16) pawn.color = colors[3];
+        startPositions.push(pawn);
+    }
+    return startPositions;
 }
-module.exports = { getStartPositions };
+function getPositionAfterMove(rolledNumber, pawn) {
+    const { position, color } = pawn;
+    switch (color) {
+        case 'red':
+            if (pawn.position + rolledNumber <= 73) {
+                if (position >= 0 && position <= 3) {
+                    return 16;
+                } else if (position <= 66 && position + rolledNumber >= 67) {
+                    return position + rolledNumber + 1;
+                } else {
+                    return position + rolledNumber;
+                }
+            } else {
+                return position;
+            }
+        case 'blue':
+            if (pawn.position + rolledNumber <= 79) {
+                if (position >= 4 && position <= 7) {
+                    return 55;
+                } else if (position <= 67 && position + rolledNumber > 67) {
+                    return position + rolledNumber - 52;
+                } else if (position <= 53 && position + rolledNumber >= 54) {
+                    return position + rolledNumber + 20;
+                } else {
+                    return position + rolledNumber;
+                }
+            } else {
+                return position;
+            }
+        case 'green':
+            if (pawn.position + rolledNumber <= 85) {
+                if (position >= 8 && position <= 11) {
+                    return 42;
+                } else if (position <= 67 && position + rolledNumber > 67) {
+                    return position + rolledNumber - 52;
+                } else if (position <= 40 && position + rolledNumber >= 41) {
+                    return position + rolledNumber + 39;
+                } else {
+                    return position + rolledNumber;
+                }
+            } else {
+                return position;
+            }
+        case 'yellow':
+            if (pawn.position + rolledNumber <= 85) {
+                if (position >= 12 && position <= 15) {
+                    return 29;
+                } else if (position <= 67 && position + rolledNumber > 67) {
+                    return position + rolledNumber - 52;
+                } else if (position <= 27 && position + rolledNumber >= 28) {
+                    return position + rolledNumber + 58;
+                } else {
+                    return position + rolledNumber;
+                }
+            } else {
+                return position;
+            }
+    }
+}
+module.exports = { getStartPositions, getPositionAfterMove };