Don't allow pieces to be moved after dropping

TetrisKit/GameController.swift

@@ -14,6 +14,8 @@ public class GameController: ObservableObject {
     public let width = 10
     public let height = 16
     
+    var state: GameState = .waitingForStart
+    
     @Published public var board: GameBoard
 
     @Published public var currentPiece: GamePiece? {
@@ -33,6 +35,7 @@ public class GameController: ObservableObject {
     }
     
     public func start() {
+        state = .playing(.normal)
         nextPiece()
     }
     
@@ -45,6 +48,10 @@ public class GameController: ObservableObject {
         self.board.set(piece: currentPiece!)
         clearLines()
         nextPiece()
+        
+        if case .playing(.dropped) = state {
+            state = .playing(.normal)
+        }
     }
     
     func clearLines() {
@@ -61,7 +68,9 @@ public class GameController: ObservableObject {
     }
     
     public func step() {
-        guard let currentPiece = currentPiece else { return }
+        guard case .playing(_) = state,
+            let currentPiece = currentPiece else { return }
+        
         let modifiedPiece = currentPiece.moved(by: (0, 1))
         if overlapsAny(modifiedPiece) {
             finalizePiece()
@@ -71,7 +80,9 @@ public class GameController: ObservableObject {
     }
     
     public func rotate(direction: RotationDirection) {
-        guard let currentPiece = currentPiece else { return }
+        guard case .playing(_) = state,
+            let currentPiece = currentPiece else { return }
+        
         let modifiedPiece = currentPiece.rotated(direction)
         if !overlapsAny(modifiedPiece) {
             self.currentPiece = modifiedPiece
@@ -79,7 +90,8 @@ public class GameController: ObservableObject {
     }
     
     public func left() {
-        guard let currentPiece = currentPiece else { return }
+        guard case .playing(.normal) = state,
+            let currentPiece = currentPiece else { return }
         let modifiedPiece = currentPiece.moved(by: (-1, 0))
         if !overlapsAny(modifiedPiece) {
             self.currentPiece = modifiedPiece
@@ -87,7 +99,8 @@ public class GameController: ObservableObject {
     }
     
     public func right() {
-        guard let currentPiece = currentPiece else { return }
+        guard case .playing(.normal) = state,
+            let currentPiece = currentPiece else { return }
         let modifiedPiece = currentPiece.moved(by: (1, 0))
         if !overlapsAny(modifiedPiece) {
             self.currentPiece = modifiedPiece
@@ -95,10 +108,12 @@ public class GameController: ObservableObject {
     }
     
     public func drop() {
+        guard case .playing(.normal) = state else { return }
         currentPiece = currentPieceAtDropPoint
+        state = .playing(.dropped)
     }
     
-    func updateCurrentPieceAtDropPoint() {
+    private func updateCurrentPieceAtDropPoint() {
         guard let currentPiece = currentPiece else { return }
         var prev = currentPiece
         currentPieceAtDropPoint = currentPiece
@@ -122,3 +137,13 @@ public class GameController: ObservableObject {
     }
 
 }
+
+enum GameState {
+    case waitingForStart
+    case playing(PlayState)
+}
+
+enum PlayState {
+    case normal
+    case dropped
+}

tetriscli/main.swift

@@ -82,7 +82,7 @@ extension TwoDimString {
         setColumn(controller.width + 1, to: "+" + String(repeating: "|", count: controller.height) + "+")
         
         for y in 0..<controller.height {
-            for x in 0..<controller.width where controller.board.get(tile: (x, y)) {
+            for x in 0..<controller.width where controller.board[x, y] {
                 self[x + 1, y + 1] = "X"
             }
         }
@@ -99,7 +99,7 @@ extension TwoDimString {
 }
 
 let controller = GameController()
-controller.currentPiece = GamePiece(tetromino: .l)
+controller.start()
 
 func readMove() {
     print(TwoDimString(controller: controller))