Re-structure pieces builder and add include first pieces batch

interface/.eslintrc.js

@@ -13,5 +13,7 @@ module.exports = {
     jest: true,
   },
   ignorePatterns: [".eslintrc.js", "dist/"],
-  rules: {},
+  rules: {
+    "@typescript-eslint/no-non-null-assertion": "off",
+  },
 };

interface/constants/InternalNodeType.ts

@@ -0,0 +1,4 @@
+export enum InternalNodeType {
+  NONE = "NONE",
+  STATION = "STATION",
+}

interface/constants/Pieces.ts

@@ -0,0 +1,200 @@
+import { Piece } from "../types/Piece";
+import { Direction } from "./Direction";
+import { InternalNodeType } from "./InternalNodeType";
+import { TrackType } from "./TrackType";
+
+const STRAIGHT_RAIL: Piece = new Piece({
+  useInternalTracks: false,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      endPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+
+const TURN_RAIL: Piece = new Piece({
+  useInternalTracks: false,
+  trackDefinitions: [
+    {
+      startPoint: Direction.SOUTH,
+      endPoint: Direction.EAST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const FOUR_WAY_CROSS_RAIL: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.NONE,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const T_JUNCTION_RAIL: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.NONE,
+  trackDefinitions: [
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const DEAD_END_STATION_RAIL: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const TURN_RAIL_TO_ROAD: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const T_JUNCTION_WITH_ROAD_ON_SIDE: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const FOUR_WAY_WITH_ONE_ROAD: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const T_JUNCTION_WITH_ROAD_AT_CENTER: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const STRAIGHT_TRACK_CHANGE: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+
+export enum PieceId {
+  P01 = "P01",
+  P02 = "P02",
+  P03 = "P03",
+  P04 = "P04",
+  P05 = "P05",
+  P06 = "P06",
+  P07 = "P07",
+  P08 = "P08",
+  P09 = "P09",
+  P10 = "P10",
+  P11 = "P11",
+  P12 = "P12",
+  P13 = "P13",
+  P14 = "P14",
+  P15 = "P15",
+  P16 = "P16",
+  P17 = "P17",
+  P18 = "P18",
+  P19 = "P19",
+  P20 = "P20",
+  P21 = "P21",
+  P22 = "P22",
+}
+
+export const pieceMap: Record<PieceId, Piece> = {
+  [PieceId.P01]: STRAIGHT_RAIL,
+  [PieceId.P02]: TURN_RAIL,
+  [PieceId.P03]: FOUR_WAY_CROSS_RAIL,
+  [PieceId.P04]: T_JUNCTION_RAIL,
+  [PieceId.P05]: DEAD_END_STATION_RAIL,
+  [PieceId.P06]: TURN_RAIL_TO_ROAD,
+  [PieceId.P07]: T_JUNCTION_WITH_ROAD_ON_SIDE,
+  [PieceId.P08]: FOUR_WAY_WITH_ONE_ROAD,
+  [PieceId.P09]: T_JUNCTION_WITH_ROAD_AT_CENTER,
+  [PieceId.P10]: STRAIGHT_TRACK_CHANGE,
+};

interface/types/Cell.ts

@@ -19,6 +19,6 @@ export class Cell {
   public getNodeAt(direction: Direction): ExternalNode {
     const node = this.externalNodes.get(direction);
     if (!node) throw Error(`Could not find node at ${direction}`);
-    return this.externalNodes.get(direction) as ExternalNode;
+    return node!;
   }
 }

interface/types/ExternalNode.ts

@@ -24,6 +24,6 @@ export class ExternalNode {
     if (!this.border) {
       throw Error(`Missing border for node`);
     }
-    return (this.border as Border).traverseFrom(this);
+    return this.border.traverseFrom(this);
   }
 }

interface/types/InternalNode.ts

@@ -1,11 +1,12 @@
 import { randomUUID } from "crypto";
+import { InternalNodeType } from "../constants/InternalNodeType";
 
 export class InternalNode {
   id: string;
-  type: string;
+  type: InternalNodeType;
 
-  constructor() {
+  constructor(type: InternalNodeType) {
     this.id = randomUUID();
-    this.type = "STATION";
+    this.type = type;
   }
 }

interface/types/Piece.ts

@@ -4,46 +4,66 @@ import { Cell } from "./Cell";
 import { InternalNode } from "./InternalNode";
 import { PlacedPiece } from "./PlacedPiece";
 import { Node } from "./Node";
+import { InternalNodeType } from "../constants/InternalNodeType";
 
-export interface TrackProps {
-  startPoint: Direction;
-  endPoint?: Direction;
-  isInternal: boolean;
-  type: TrackType;
+export interface PieceProps {
+  readonly useInternalTracks: boolean;
+  readonly internalNodeType?: InternalNodeType;
+  readonly trackDefinitions: {
+    readonly startPoint: Direction;
+    readonly endPoint?: Direction;
+    readonly type: TrackType;
+  }[];
 }
 
-export class Piece {
-  tracks: Set<{
-    joinedPoints: {
-      firstPoint: Direction;
-      secondPoint: Direction | InternalNode;
+type Track = {
+  readonly joinedPoints: {
+    readonly firstPoint: Direction;
+    readonly secondPoint: Direction | InternalNode;
   };
-    type: TrackType;
-  }>;
-  internalNodes: Set<InternalNode>;
+  readonly type: TrackType;
+};
 
-  constructor(hasInternalNode: boolean, trackDefinitions: TrackProps[]) {
-    const internalNode = new InternalNode();
-    this.internalNodes = new Set();
-    if (hasInternalNode) {
-      this.internalNodes.add(internalNode);
+export class Piece {
+  readonly tracks: Set<Track>;
+  readonly internalNode?: InternalNode;
+
+  constructor(pieceProps: PieceProps) {
+    if (pieceProps.useInternalTracks) {
+      if (!pieceProps.internalNodeType) {
+        throw Error(
+          "Expected to find internal node type when useInternalTracks is set",
+        );
       }
+      this.internalNode = new InternalNode(pieceProps.internalNodeType);
       this.tracks = new Set(
-      trackDefinitions.map((track) => {
-        if (!track.isInternal && !track.endPoint) {
-          throw Error("Missing direction for non-internal track");
-        }
+        pieceProps.trackDefinitions.map((trackDefinition) => {
           return {
             joinedPoints: {
-            firstPoint: track.startPoint,
-            secondPoint: track.isInternal
-              ? internalNode
-              : (track.endPoint as Direction),
+              firstPoint: trackDefinition.startPoint,
+              secondPoint: this.internalNode!,
             },
-          type: track.type,
+            type: trackDefinition.type,
           };
         }),
       );
+    } else {
+      this.internalNode = undefined;
+      this.tracks = new Set(
+        pieceProps.trackDefinitions.map((trackDefinition) => {
+          if (!trackDefinition.endPoint) {
+            throw Error("Missing end point for non-internal track");
+          }
+          return {
+            joinedPoints: {
+              firstPoint: trackDefinition.startPoint,
+              secondPoint: trackDefinition.endPoint,
+            },
+            type: trackDefinition.type,
+          };
+        }),
+      );
+    }
   }
 
   toPlacedPiece(cell: Cell) {
@@ -55,14 +75,14 @@ export class Piece {
               firstNode: cell.getNodeAt(track.joinedPoints.firstPoint),
               secondNode:
                 track.joinedPoints.secondPoint instanceof Node
-                  ? track.joinedPoints.secondPoint as Node
+                  ? (track.joinedPoints.secondPoint as Node)
                   : cell.getNodeAt(track.joinedPoints.secondPoint as Direction),
             },
             type: track.type,
           };
         }),
       ),
-      this.internalNodes,
+      this.internalNode,
       cell,
     );
   }

interface/types/PlacedPiece.ts

@@ -11,7 +11,7 @@ export class PlacedPiece {
     };
     type: TrackType;
   }>;
-  internalNodes: Set<InternalNode>;
+  internalNode?: InternalNode;
   cell: Cell;
 
   constructor(
@@ -19,11 +19,11 @@ export class PlacedPiece {
       nodes: { firstNode: Node; secondNode: Node };
       type: TrackType;
     }>,
-    internalNodes: Set<InternalNode>,
+    internalNodes: InternalNode | undefined,
     cell: Cell,
   ) {
     this.tracks = tracks;
-    this.internalNodes = internalNodes;
+    this.internalNode = internalNodes;
     this.cell = cell;
   }
 }