azul: implement complete game iteration

src/azul.rs

@@ -8,8 +8,15 @@ use rand::prelude::*;
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
 struct GameState {
+    #[serde(skip)]
+    #[serde(default = "make_rng")]
+    rng: StdRng,
     n_players: usize,
     current_player: usize,
+    starting_player: usize,
+    game_end: bool,
+    rounds: usize,
+    days: usize,
     bag: TileSet,
     lid: TileSet,
     factories: Vec<TileSet>,
@@ -17,6 +24,10 @@ struct GameState {
     players: Vec<Player>,
 }
 
+fn make_rng() -> StdRng {
+    StdRng::from_entropy()
+}
+
 impl GameState {
     pub fn new(n_players: usize) -> Result<GameState, &'static str> {
         if n_players < 2 {
@@ -45,8 +56,13 @@ impl GameState {
         }
 
         let game = GameState {
+            rng: StdRng::from_entropy(),
             n_players,
             current_player: 0,
+            starting_player: 0,
+            game_end: false,
+            rounds: 0,
+            days: 0,
             bag: TileSet {
                 blue: 20,
                 yellow: 20,
@@ -73,12 +89,11 @@ impl GameState {
     /// Fills the factories from the bag
     /// Will replenish the bag from the lid when empty
     /// Will return with partially filled factories if out of tiles
-    fn fill(&mut self, mut rng: StdRng) -> Result<(), &'static str> {
-        for factory in &self.factories {
-            if factory.len() != 0 {
-                return Err("Cannot fill, factories are not empty");
-            }
+    fn fill(&mut self) -> Result<(), &'static str> {
+        if !self.is_empty() {
+            return Err("Cannot fill, there are still tiles left to be picked");
         }
+
         for factory in &mut self.factories {
             for _ in 0..4 {
                 if self.bag.is_empty() && !self.lid.is_empty() {
@@ -103,19 +118,28 @@ impl GameState {
                     ];
 
                     let dist = WeightedIndex::new(&weights).unwrap();
-                    let picked = choices[dist.sample(&mut rng)];
+                    let picked = choices[dist.sample(&mut self.rng)];
 
                     self.bag.add_color(picked, 1)?;
                     factory.add_color(picked, 1)?;
                 }
             }
         }
+
         Ok(())
     }
 
+    /// Returns whether or not the market and factories are empty
+    fn is_empty(&self) -> bool {
+        let factories = self.factories.iter().all(|f| f.is_empty());
+        let market = self.market.is_empty();
+
+        factories && market
+    }
+
     /// Scores the game and clears the boards into the lid
     /// Doesn't check if game is ready to be scored!
-    fn score(&mut self) -> Result<(), &'static str> {
+    fn score_unchecked(&mut self) -> Result<(), &'static str> {
         for i in 0..self.players.len() {
             let player = &mut self.players[i];
 
@@ -146,7 +170,7 @@ impl GameState {
             player.points -= negative;
 
             if player.floor.start == 1 {
-                self.current_player = i;
+                self.starting_player = i;
                 player.floor.start = 0;
             }
 
@@ -157,6 +181,43 @@ impl GameState {
         Ok(())
     }
 
+    /// Manages the entire lifecycle of the game
+    /// After a move, will check if game should be scored,
+    /// After scoring, either ends the game and calculates bonus
+    /// or fills the factories again and sets the starting player
+    /// Also tracks rounds and days
+    fn do_iter(&mut self, game_move: GameMove) -> Result<(), MoveErr> {
+        if self.game_end {
+            return Err(MoveErr::Other("Game is over"));
+        }
+
+        self.do_move(game_move).map_err(|e| e)?;
+
+        if self.is_empty() {
+            self.score_unchecked().map_err(|e| MoveErr::Other(e))?;
+            self.game_end = self
+                .players
+                .iter()
+                .any(|p| p.wall.iter().any(|r| r.iter().all(|&v| v)));
+
+            if self.game_end {
+                for i in 0..self.n_players {
+                    self.players[i].points += self.players[i]
+                        .bonus_score()
+                        .map_err(|e| MoveErr::Other(e))?;
+                }
+            } else {
+                self.fill().map_err(|e| MoveErr::Other(e))?;
+                self.current_player = self.starting_player;
+                self.days += 1;
+            }
+        }
+
+        self.rounds += 1;
+
+        Ok(())
+    }
+
     /// Does a move according to the policy defined in the move
     fn do_move(&mut self, game_move: GameMove) -> Result<(), MoveErr> {
         match game_move.policy {
@@ -494,7 +555,7 @@ impl From<TileSet> for TileSetWithStart {
 
 #[derive(Debug, Serialize, Deserialize, Clone, Default)]
 struct Player {
-    points: u8,
+    points: usize,
     pattern_lines: [PatternLine; 5],
     wall: Wall,
     floor: TileSetWithStart,
@@ -538,7 +599,7 @@ impl Player {
     }
 
     /// given a coordinate on the board, returns how many tiles are in its group
-    fn connected(&self, row: usize, column: usize) -> u8 {
+    fn connected(&self, row: usize, column: usize) -> usize {
         // This implementation scans for contigious runs of tiles
         // until it finds the group the tile we're checking is part of
         // Does this for both the row and the column