add new tile/room functions; redo Not Found errors

src/game.rs

@@ -81,7 +81,11 @@ impl Version {
 }
 
 #[derive(Debug)]
-pub struct SpriteNotFound;
+pub enum NotFound {
+    Room,
+    Sprite,
+    Tile,
+}
 
 #[derive(Clone, Debug, PartialEq)]
 pub struct Game {
@@ -244,7 +248,7 @@ impl Game {
 
     /// todo refactor this into "get T by ID", taking a Vec<T> and an ID name?
     #[inline]
-    pub fn get_sprite_by_id(&self, id: String) -> Result<&Sprite, SpriteNotFound> {
+    pub fn get_sprite_by_id(&self, id: String) -> Result<&Sprite, NotFound> {
         let index = self.sprites.iter().position(
             |sprite| sprite.id == id
         );
@@ -252,14 +256,65 @@ impl Game {
         if index.is_some() {
             Ok(&self.sprites[index.unwrap()])
         } else {
-            Err(SpriteNotFound)
+            Err(NotFound::Sprite)
         }
     }
 
-    pub fn get_avatar(&self) -> Result<&Sprite, SpriteNotFound> {
+    pub fn get_tile_by_id(&self, id: String) -> Result<&Tile, NotFound> {
+        let index = self.tiles.iter().position(
+            |tile| tile.id == id
+        );
+
+        if index.is_some() {
+            Ok(&self.tiles[index.unwrap()])
+        } else {
+            Err(NotFound::Tile)
+        }
+    }
+
+    pub fn get_room_by_id(&self, id: String) -> Result<&Room, NotFound> {
+        let index = self.rooms.iter().position(
+            |room| room.id == id
+        );
+
+        if index.is_some() {
+            Ok(&self.rooms[index.unwrap()])
+        } else {
+            Err(NotFound::Room)
+        }
+    }
+
+    pub fn get_avatar(&self) -> Result<&Sprite, NotFound> {
         self.get_sprite_by_id("A".to_string())
     }
 
+    // todo result
+    pub fn get_tiles_by_ids(&self, ids: Vec<String>) -> Vec<&Tile> {
+        let mut tiles: Vec<&Tile> = Vec::new();
+
+        for id in ids {
+            let tile = self.get_tile_by_id(id);
+            if tile.is_ok() {
+                tiles.push(tile.unwrap());
+            }
+        }
+
+        tiles
+    }
+
+    pub fn get_tiles_for_room(&self, id: String) -> Result<Vec<&Tile>, NotFound> {
+        let room = self.get_room_by_id(id);
+        if room.is_err() {
+            return Err(NotFound::Room);
+        }
+        let mut tile_ids = room.unwrap().tiles.clone();
+        tile_ids.sort();
+        tile_ids.dedup();
+        // remove Ok once this function returns a result
+        Ok(self.get_tiles_by_ids(tile_ids))
+    }
+
+    // return? array of changes made? status?
     pub fn merge(game: Game) {
         // ignore title, version, room format, room type, font, text direction
 
@@ -440,7 +495,7 @@ impl Game {
     pub fn new_variable_id(&self) -> String {
         new_unique_id(self.variable_ids())
     }
-    
+
     /// adds a palette safely and returns the new palette ID
     #[inline]
     pub fn add_palette(&mut self, mut palette: Palette) -> String {