From 32d00b913c713856f52e932dc885a44ef44586d4 Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Sun, 10 Apr 2016 15:41:30 +0200
Subject: Simplify path evolution and enable bombed cell exit on opposite
 direction

---
 src/ch/epfl/xblast/SubCell.java          |  2 +-
 src/ch/epfl/xblast/server/GameState.java | 53 ++++++++++++++++----------------
 2 files changed, 27 insertions(+), 28 deletions(-)

(limited to 'src/ch')

diff --git a/src/ch/epfl/xblast/SubCell.java b/src/ch/epfl/xblast/SubCell.java
index 531de01..adb0f9b 100644
--- a/src/ch/epfl/xblast/SubCell.java
+++ b/src/ch/epfl/xblast/SubCell.java
@@ -81,7 +81,7 @@ public final class SubCell {
      * @param subCell the other SubCell
      * @return the distance
      */
-    private int distanceTo(SubCell subCell) {
+    public int distanceTo(SubCell subCell) {
         return Math.abs(this.x - subCell.x) + Math.abs(this.y - subCell.y);
     }
 
diff --git a/src/ch/epfl/xblast/server/GameState.java b/src/ch/epfl/xblast/server/GameState.java
index 702fa37..2818f26 100644
--- a/src/ch/epfl/xblast/server/GameState.java
+++ b/src/ch/epfl/xblast/server/GameState.java
@@ -202,11 +202,11 @@ public final class GameState {
                                      Set<Cell> bombedCells1, Board board1, Set<Cell> blastedCells1,
                                      Direction requestedDirection) {
 
-        // 1. Compute the new path
-        Sq<Player.DirectedPosition> path1 = GameState.nextPath(player0, requestedDirection);
+        // 1. Compute the new path to follow
+        Sq<Player.DirectedPosition> updatedPath = GameState.nextPath(player0, requestedDirection);
 
-        // 2. Check possible collisions and update the Sequence if necessary
-        Sq<Player.DirectedPosition> directedPos1 = GameState.handleCollisions(player0, path1, board1, bombedCells1);
+        // 2. Follow the path if the Player can (moving life state and no collision)
+        Sq<Player.DirectedPosition> directedPos1 = GameState.moveAhead(player0, updatedPath, board1, bombedCells1);
 
         // 3. Apply damages and generate a new LifeState Sequence
         Sq<Player.LifeState> lifeStates1 = GameState.nextLifeState(player0, directedPos1, blastedCells1);
@@ -240,11 +240,9 @@ public final class GameState {
      * @return the next path
      */
     private static Sq<Player.DirectedPosition> nextPath(Player p0, Direction requestedDir) {
-        Sq<Player.DirectedPosition> path1 = GameState.newPath(
+        return GameState.newPath(
                 Player.DirectedPosition.moving(p0.directedPositions().head()),
                 GameState.nextDirection(p0, requestedDir));
-
-        return p0.lifeState().canMove() ? path1.tail() : path1;
     }
 
     /**
@@ -299,39 +297,40 @@ public final class GameState {
     /**
      * Checks for possible collisions and update the path if necessary.
      *
-     * @param player0       the Player
-     * @param projectedPath the current path projection
-     * @param board1        the updated Board
-     * @param bombedCells1  the Set of bombed Cell-s
+     * @param path         the current path projection
+     * @param board1       the updated Board
+     * @param bombedCells1 the Set of bombed Cell-s
      * @return the corrected path
      */
-    private static Sq<Player.DirectedPosition> handleCollisions(Player player0,
-                                                                Sq<Player.DirectedPosition> projectedPath,
-                                                                Board board1, Set<Cell> bombedCells1) {
+    private static Sq<Player.DirectedPosition> moveAhead(Player player0,
+                                                         Sq<Player.DirectedPosition> path,
+                                                         Board board1, Set<Cell> bombedCells1) {
+
+        if (!player0.lifeState().canMove())
+            return path;
 
-        Cell projectedCell = GameState.nextCentralPosition(projectedPath).containingCell();
-        if (GameState.isColliding(player0, projectedCell, board1, bombedCells1))
-            return Sq.repeat(1, player0.directedPositions().head())
-                    .concat(projectedPath);
+        if (GameState.isColliding(path, board1, bombedCells1))
+            return path;
 
-        return projectedPath;
+        return path.tail();
     }
 
     /**
      * Returns T(the player is colliding with an object).
      *
-     * @param player0       the Player
-     * @param projectedCell the projected next Cell
-     * @param board1        the updated Board
-     * @param bombedCells1  the Set of bombed Cell-s
+     * @param path         the path
+     * @param board1       the updated Board
+     * @param bombedCells1 the Set of bombed Cell-s
      * @return T(the player is colliding with an object)
      */
-    private static boolean isColliding(Player player0, Cell projectedCell, Board board1, Set<Cell> bombedCells1) {
-        if (!board1.blockAt(projectedCell).canHostPlayer())
+    private static boolean isColliding(Sq<Player.DirectedPosition> path, Board board1, Set<Cell> bombedCells1) {
+        SubCell nextPos = path.tail().head().position();
+        if (!board1.blockAt(nextPos.containingCell()).canHostPlayer())
             return true;
 
-        if (bombedCells1.contains(projectedCell) && projectedCell.equals(player0.position().containingCell()))
-            if (player0.position().distanceToCentral() <= Board.BOMB_BLOCKING_DISTANCE)
+        SubCell nextCentralPos = GameState.nextCentralPosition(path.tail());
+        if (bombedCells1.contains(nextCentralPos.containingCell()))
+            if (nextPos.distanceTo(nextCentralPos) <= Board.BOMB_BLOCKING_DISTANCE)
                 return true;
 
         return false;
-- 
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