From f3a6257cd4f4399eb49abc5b0c8eadb67d9310a4 Mon Sep 17 00:00:00 2001
From: Alfred Baumann <alfred.baumann@edu.gbsl.ch>
Date: Tue, 9 Jun 2026 16:16:44 +0200
Subject: [PATCH] anfang des wave function collapse algorithmus

---
 src/algorithms/wfc.py | 122 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 src/algorithms/wfc.py

diff --git a/src/algorithms/wfc.py b/src/algorithms/wfc.py
new file mode 100644
index 0000000..3e76979
--- /dev/null
+++ b/src/algorithms/wfc.py
@@ -0,0 +1,122 @@
+from netTypes import Direction, PieceType
+from src.net import NetGame
+
+
+class WFCSolver:
+    game: NetGame
+    observed: list[list[bool]]
+    possible_connections: list[list[set[Direction]]]
+
+    def __init__(self, game: NetGame) -> None:
+        self.game = game
+        self.observed = [[False] * self.game.width for _ in range(self.game.height)]
+        self.possible_connections = [
+            [
+                {Direction.UP, Direction.RIGHT, Direction.DOWN, Direction.LEFT}
+                for _ in range(self.game.width)
+            ]
+            for _ in range(self.game.width)
+        ]
+
+        # Es kann nicht mit dem Rand des Feldes eine Verbindung bestehen
+        for column in self.possible_connections:
+            column[0].remove(Direction.UP)
+            column[-1].remove(Direction.DOWN)
+
+        for i in range(len(self.possible_connections[0])):
+            self.possible_connections[0][i].remove(Direction.LEFT)
+
+        for i in range(len(self.possible_connections[-1])):
+            self.possible_connections[-1][i].remove(Direction.RIGHT)
+
+    def get_possible_directions(self, x: int, y: int) -> set[Direction]:
+        ptype = self.game.get_piece(x, y).type
+        dirs = self.possible_connections[x][y]
+        if ptype == PieceType.NODE:
+            return dirs
+        elif ptype == PieceType.CORNER:
+            possible: set[Direction] = set()
+            if dirs.union({Direction.UP, Direction.RIGHT}):
+                possible.add(Direction.UP)
+            if dirs.union({Direction.RIGHT, Direction.DOWN}):
+                possible.add(Direction.RIGHT)
+            if dirs.union({Direction.DOWN, Direction.LEFT}):
+                possible.add(Direction.DOWN)
+            if dirs.union({Direction.LEFT, Direction.UP}):
+                possible.add(Direction.LEFT)
+            return possible
+        elif ptype == PieceType.STRAIGHT:
+            if len(dirs) == 4:
+                return dirs
+            elif {Direction.UP, Direction.DOWN}.issubset(dirs):
+                return {Direction.UP}
+            elif {Direction.LEFT, Direction.RIGHT}.issubset(dirs):
+                return {Direction.RIGHT}
+            else:
+                return set()
+        else:
+            if len(dirs) == 4:
+                return dirs
+            elif len(dirs) == 3:
+                not_connected = (
+                    {Direction.UP, Direction.DOWN, Direction.LEFT, Direction.RIGHT}
+                    .difference(dirs)
+                    .pop()
+                )
+                return {Direction((not_connected + 2) % 4)}
+            else:
+                return set()
+
+    def get_possible_direction_count(self, x: int, y: int) -> int:
+        ptype = self.game.get_piece(x, y).type
+        connectable = self.possible_connections[x][y]
+        camount = len(connectable)
+        if camount == 4:
+            return 4
+        if ptype == PieceType.NODE:
+            return camount
+        elif ptype == PieceType.CORNER:
+            if camount == 3:
+                return 2
+            elif (
+                camount == 2
+                and connectable != {Direction.UP, Direction.DOWN}
+                and connectable != {Direction.LEFT, Direction.RIGHT}
+            ):  # 2 nicht-gegenüberliegende seiten
+                return 1
+            else:
+                return 0
+        elif ptype == PieceType.STRAIGHT:
+            if camount == 4:
+                return 4
+            elif (
+                camount == 3
+                or connectable == {Direction.UP, Direction.DOWN}
+                or connectable == {Direction.LEFT, Direction.RIGHT}
+            ):
+                return 1
+            else:
+                return 0
+        else:  # T-JUNCTION
+            if camount == 4:
+                return 4
+            elif camount == 3:
+                return 1
+            else:
+                return 0
+
+    def solve(self) -> None:
+        coordinates = list(
+            ((i, j) for i in range(self.game.width) for j in range(self.game.height))
+        )
+        while not self.game.solved():
+            (x, y) = min(
+                coordinates, key=lambda t: self.get_possible_direction_count(*t)
+            )
+            if self.get_possible_direction_count(x, y) == 0:
+                raise NotImplementedError(
+                    "Irgendwo eine falsche Richtung gewählt, muss diese Logik noch schreiben"
+                )
+            direction = self.get_possible_directions(x, y).pop()
+            self.game.set_direction(x, y, direction)
+            # TODO: Nachbaren updaten