minimax done :D

src/gamedata/algorithms.rs

@@ -1,10 +1,44 @@
-use super::{heuristic, Board, Disk};
-pub fn minimax_decision(board: &Board, depth: i32) -> Board {
-    todo!()
+use super::{flip_disk, heuristic::get_score, Board, Disk};
+pub fn minimax_decision(board: &Board, disk: Disk, depth: &i32) -> Board {
+    let (child, _) = maximise(board, &disk, depth);
+    match child {
+        Some(state) => state,
+        None => Board::default(),
     }
-fn maximise(board: &Board, depth: &i32) -> (Board, i32) {
-    todo!()
 }
-fn minimise(board: &Board, depth: &i32) -> (Board, i32) {
-    todo!()
+fn maximise(board: &Board, disk: &Disk, depth: &i32) -> (Option<Board>, i32) {
+    match board.game_over() || *depth == 0 {
+        true => return (None, get_score(board, flip_disk(*disk))),
+        false => {
+            let (mut max_child, mut max_utility): (Option<Board>, i32) = (None, i32::MIN);
+            for child in board.get_children(*disk) {
+                let (_, utility) = minimise(&child, &flip_disk(*disk), &(depth - 1));
+                if utility > max_utility {
+                    (max_child, max_utility) = (Some(child), utility)
+                }
+            }
+            (max_child, max_utility)
+        }
+    }
+}
+fn minimise(board: &Board, disk: &Disk, depth: &i32) -> (Option<Board>, i32) {
+    match board.game_over() || *depth == 0 {
+        true => return (None, get_score(board, flip_disk(*disk))),
+        false => {
+            let (mut min_child, mut min_utility): (Option<Board>, i32) = (None, i32::MIN);
+            for child in board.get_children(*disk) {
+                let (_, utility) = maximise(&child, &flip_disk(*disk), &(depth - 1));
+                if utility > min_utility {
+                    (min_child, min_utility) = (Some(child), utility)
+                }
+            }
+            (min_child, min_utility)
+        }
+    }
+}
+#[test]
+fn minimax_test() {
+    let mut board = Board::default();
+    dbg!(minimax_decision(&board, Disk::BLU, &4).columns.as_rows());
+    assert!(false);
 }