Refactor bruteforce interface

src/belt_finding/brute_force.rs

@@ -50,15 +50,63 @@ impl PathField {
     }
 }
 
-static MAX_UNDERGROUND_LENGTH: u8 = 5;
+static MAX_UNDERGROUND_LENGTH: u8 = 6;
+
+pub struct BruteforceBuilder {
+    map: Map<BruteforceField>,
+    path: Vec<[(Position, Direction); 2]>,
+}
+
+impl BruteforceBuilder {
+    pub fn new(width: usize, height: usize) -> Self {
+        Self {
+            map: Map::new(width, height),
+            path: Vec::new(),
+        }
+    }
+
+    pub fn add_path(&mut self, start: (Position, Direction), end: (Position, Direction)) {
+        self.path.push([start, end]);
+    }
+
+    pub fn set_blocked(&mut self, x: usize, y: usize, blocked: bool) {
+        self.map.get_mut(x, y).blocked = blocked;
+    }
+
+    pub fn set_blocked_range(&mut self, x1: usize, y1: usize, x2: usize, y2: usize, blocked: bool) {
+        for x in x1..=x2 {
+            for y in y1..=y2 {
+                self.set_blocked(x, y, blocked);
+            }
+        }
+    }
+
+    pub fn build(self) -> Bruteforce {
+        let mut b = Bruteforce {
+            map: self.map,
+            path: Vec::new(),
+            end: self.path[0][1],
+            solution_count: 0,
+            count: 0,
+        };
+
+        b.apply_path_field(PathField::Belt {
+            pos: self.path[0][0].0,
+            dir: self.path[0][0].1,
+        });
+
+        b.map.get_mut(self.path[0][1].0.x, self.path[0][1].0.y);
+
+        b
+    }
+}
 
 pub struct Bruteforce {
-    pub map: Map<BruteforceField>,
-    pub path: Vec<PathField>,
-    pub end_pos: Position,
-    pub end_dir: Direction,
-    pub solution_count: u128,
-    pub count: u128,
+    map: Map<BruteforceField>,
+    path: Vec<PathField>,
+    end: (Position, Direction),
+    solution_count: u128,
+    count: u128,
 }
 
 impl Bruteforce {
@@ -113,27 +161,15 @@ impl Bruteforce {
         match self.path.last().unwrap() {
             PathField::Belt { pos, dir } => self
                 .pos_in_direction(pos, dir, 1)
-                .filter(|p| p == &self.end_pos && dir != &self.end_dir.reverse())
+                .filter(|p| p == &self.end.0 && dir != &self.end.1.reverse())
                 .is_some(),
             PathField::Underground { pos, dir, len } => self
                 .pos_in_direction(pos, dir, *len as usize + 1)
-                .filter(|p| p == &self.end_pos && dir != &self.end_dir.reverse())
+                .filter(|p| p == &self.end.0 && dir != &self.end.1.reverse())
                 .is_some(),
         }
     }
 
-    fn next_state_internal(&mut self, pos: Position, dir: Direction) -> bool {
-        if let Some(next_pos) = self
-            .pos_in_direction(&pos, &dir, 1)
-            .filter(|p| !self.map.get(p.x, p.y).blocked)
-        {
-            self.apply_path_field(PathField::Belt { pos: next_pos, dir });
-            true
-        } else {
-            false
-        }
-    }
-
     fn path_field_end(&self, path_field: &PathField) -> (Position, Direction) {
         match path_field {
             PathField::Belt { pos, dir } => (*pos, *dir),
@@ -246,6 +282,14 @@ impl Bruteforce {
             Direction::Left => pos.x.checked_sub(len).map(|x| Position::new(x, pos.y)),
         }
     }
+
+    pub fn count(&self) -> u128 {
+        self.count
+    }
+
+    pub fn solution_count(&self) -> u128 {
+        self.solution_count
+    }
 }
 
 impl Display for Bruteforce {
@@ -301,6 +345,8 @@ impl Display for Bruteforce {
             }
         }
 
+        m.set(self.end.0.x, self.end.0.y, Some((0, "t")));
+
         // Print body
 
         for y in 0..self.map.height {