refactor: rename Cell -> Tile, Item -> Feature

2 files changed, 132 insertions, 0 deletions

diff --git a/src/Tile/Tile.test.ts b/src/Tile/Tile.test.ts
new file mode 100644
index 0000000..62ac51e
--- /dev/null
+++ b/src/Tile/Tile.test.ts
@@ -0,0 +1,56 @@
+import assert from 'assert';
+import Tile, { Direction, Feature } from './Tile';
+
+const { North, East, South, West } = Direction;
+const { Road, Town, Empty, River } = Feature;
+
+describe('Tile', () => {
+  describe('getSide', () => {
+    it('Should get North, East, South and West sides correctly', () => {
+      const cell = new Tile(Empty, [Road, Town, Empty, River]);
+
+      assert.strictEqual(cell.getSide(North), Road);
+      assert.strictEqual(cell.getSide(East), Town);
+      assert.strictEqual(cell.getSide(South), Empty);
+      assert.strictEqual(cell.getSide(West), River);
+    });
+
+    it('Should respect cell orientation', () => {
+      const cell = new Tile(Empty, [Road, Town, Empty, River]);
+      cell.rotate(5);
+
+      assert.strictEqual(cell.getSide(North), River);
+      assert.strictEqual(cell.getSide(East), Road);
+      assert.strictEqual(cell.getSide(South), Town);
+      assert.strictEqual(cell.getSide(West), Empty);
+    });
+
+    it('Should work with negative orientation', () => {
+      const cell = new Tile(Empty, [Road, Town, Empty, River]);
+      cell.rotate(-7);
+
+      assert.strictEqual(cell.getSide(North), River);
+      assert.strictEqual(cell.getSide(East), Road);
+      assert.strictEqual(cell.getSide(South), Town);
+      assert.strictEqual(cell.getSide(West), Empty);
+    });
+  });
+
+  describe('getAttachments', () => {
+    it('Should correclty list legal attachments', () => {
+      const attachTo = new Tile(Town, [Road, Town, Town, Road])
+      const cell = new Tile(Road, [Empty, Road, Road, Empty])
+
+      cell.print();
+      attachTo.print();
+
+      const attachments = attachTo.getAttachments(cell);
+      assert.strictEqual(attachments.length, 4);
+      assert.deepStrictEqual(attachments[0], { side: 0, rotation: 0, cell, attachTo });
+      assert.deepStrictEqual(attachments[1], { side: 0, rotation: 1, cell, attachTo });
+      assert.deepStrictEqual(attachments[2], { side: 3, rotation: 0, cell, attachTo });
+      assert.deepStrictEqual(attachments[3], { side: 3, rotation: 3, cell, attachTo });
+    });
+  });
+});
+
diff --git a/src/Tile/Tile.ts b/src/Tile/Tile.ts
new file mode 100644
index 0000000..4eee263
--- /dev/null
+++ b/src/Tile/Tile.ts
@@ -0,0 +1,76 @@
+import _ from 'lodash';
+import Debug, { Debugger } from 'debug';
+
+const debug = Debug('cell');
+
+export enum Direction {
+  North,
+  East,
+  South,
+  West
+}
+
+export enum Feature {
+  Empty = " ",
+  Road = "R",
+  Town = "T",
+  River = "I",
+  Church = "C",
+}
+
+export interface Attachment {
+  attachTo: Tile;
+  side: Direction;
+  cell: Tile;
+  rotation: number; // Clockwise rotation of a cell
+}
+
+
+export default class Tile {
+  center: Feature;
+  private sides: [Feature, Feature, Feature, Feature];
+  neighbors: [Tile, Tile, Tile, Tile];
+  private orientation: number // amount of 90-degree counter-clockwise rotations from original orientation
+  shield?: boolean;
+
+  debug: Debugger;
+
+  public constructor(center: Feature, sides: [Feature, Feature, Feature, Feature], orientation = 0, shield = false) {
+    this.center = center;
+    this.sides = sides;
+    this.shield = shield;
+    this.orientation = orientation;
+  }
+
+  print() {
+    console.log( ` ${this.getSide(Direction.North)} \n${this.getSide(Direction.West)}${this.center}${this.getSide(Direction.East)}\n ${this.getSide(Direction.South)} `);
+  }
+
+  getSide(direction: Direction) {
+    return this.sides[(((this.orientation + direction) % 4) + 4) % 4];
+  }
+
+  rotate(rotation = 1) {
+    debug(`Rotating ${rotation} clockwise`)
+    this.orientation = this.orientation - rotation;
+  }
+
+  getAttachments(cell: Tile) {
+    return _.flatten([0, 1, 2, 3].map(side => {
+      const item = this.getSide(side);
+      return [0, 1, 2, 3]
+        .filter(rotation => cell.getSide(side - rotation + 2) === item)
+        .map(rotation => ({
+          cell,
+          rotation,
+          side,
+          attachTo: this as Tile
+        }))
+    }));
+  }
+
+  attach(cell: Tile, side: Direction) {
+    if (this.neighbors[side]) throw new Error('There is something already attached to this side!');
+    this.neighbors[side] = cell;
+  }
+}