wip

packages/racing/domain/entities/Track.ts

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+/**
+ * Domain Entity: Track
+ * 
+ * Represents a racing track/circuit in the GridPilot platform.
+ * Immutable entity with factory methods and domain validation.
+ */
+
+export type TrackCategory = 'oval' | 'road' | 'street' | 'dirt';
+export type TrackDifficulty = 'beginner' | 'intermediate' | 'advanced' | 'expert';
+
+export class Track {
+  readonly id: string;
+  readonly name: string;
+  readonly shortName: string;
+  readonly country: string;
+  readonly category: TrackCategory;
+  readonly difficulty: TrackDifficulty;
+  readonly lengthKm: number;
+  readonly turns: number;
+  readonly imageUrl?: string;
+  readonly gameId: string;
+
+  private constructor(props: {
+    id: string;
+    name: string;
+    shortName: string;
+    country: string;
+    category: TrackCategory;
+    difficulty: TrackDifficulty;
+    lengthKm: number;
+    turns: number;
+    imageUrl?: string;
+    gameId: string;
+  }) {
+    this.id = props.id;
+    this.name = props.name;
+    this.shortName = props.shortName;
+    this.country = props.country;
+    this.category = props.category;
+    this.difficulty = props.difficulty;
+    this.lengthKm = props.lengthKm;
+    this.turns = props.turns;
+    this.imageUrl = props.imageUrl;
+    this.gameId = props.gameId;
+  }
+
+  /**
+   * Factory method to create a new Track entity
+   */
+  static create(props: {
+    id: string;
+    name: string;
+    shortName?: string;
+    country: string;
+    category?: TrackCategory;
+    difficulty?: TrackDifficulty;
+    lengthKm: number;
+    turns: number;
+    imageUrl?: string;
+    gameId: string;
+  }): Track {
+    this.validate(props);
+
+    return new Track({
+      id: props.id,
+      name: props.name,
+      shortName: props.shortName ?? props.name.slice(0, 3).toUpperCase(),
+      country: props.country,
+      category: props.category ?? 'road',
+      difficulty: props.difficulty ?? 'intermediate',
+      lengthKm: props.lengthKm,
+      turns: props.turns,
+      imageUrl: props.imageUrl,
+      gameId: props.gameId,
+    });
+  }
+
+  /**
+   * Domain validation logic
+   */
+  private static validate(props: {
+    id: string;
+    name: string;
+    country: string;
+    lengthKm: number;
+    turns: number;
+    gameId: string;
+  }): void {
+    if (!props.id || props.id.trim().length === 0) {
+      throw new Error('Track ID is required');
+    }
+
+    if (!props.name || props.name.trim().length === 0) {
+      throw new Error('Track name is required');
+    }
+
+    if (!props.country || props.country.trim().length === 0) {
+      throw new Error('Track country is required');
+    }
+
+    if (props.lengthKm <= 0) {
+      throw new Error('Track length must be positive');
+    }
+
+    if (props.turns < 0) {
+      throw new Error('Track turns cannot be negative');
+    }
+
+    if (!props.gameId || props.gameId.trim().length === 0) {
+      throw new Error('Game ID is required');
+    }
+  }
+
+  /**
+   * Get formatted length string
+   */
+  getFormattedLength(): string {
+    return `${this.lengthKm.toFixed(2)} km`;
+  }
+}