/**
 * Domain Entity: League
 * 
 * Represents a league in the GridPilot platform.
 * Immutable entity with factory methods and domain validation.
 */

export interface LeagueSettings {
  pointsSystem: 'f1-2024' | 'indycar' | 'custom';
  sessionDuration?: number;
  qualifyingFormat?: 'single-lap' | 'open';
  customPoints?: Record<number, number>;
}

export class League {
  readonly id: string;
  readonly name: string;
  readonly description: string;
  readonly ownerId: string;
  readonly settings: LeagueSettings;
  readonly createdAt: Date;

  private constructor(props: {
    id: string;
    name: string;
    description: string;
    ownerId: string;
    settings: LeagueSettings;
    createdAt: Date;
  }) {
    this.id = props.id;
    this.name = props.name;
    this.description = props.description;
    this.ownerId = props.ownerId;
    this.settings = props.settings;
    this.createdAt = props.createdAt;
  }

  /**
   * Factory method to create a new League entity
   */
  static create(props: {
    id: string;
    name: string;
    description: string;
    ownerId: string;
    settings?: Partial<LeagueSettings>;
    createdAt?: Date;
  }): League {
    this.validate(props);

    const defaultSettings: LeagueSettings = {
      pointsSystem: 'f1-2024',
      sessionDuration: 60,
      qualifyingFormat: 'open',
    };

    return new League({
      id: props.id,
      name: props.name,
      description: props.description,
      ownerId: props.ownerId,
      settings: { ...defaultSettings, ...props.settings },
      createdAt: props.createdAt ?? new Date(),
    });
  }

  /**
   * Domain validation logic
   */
  private static validate(props: {
    id: string;
    name: string;
    description: string;
    ownerId: string;
  }): void {
    if (!props.id || props.id.trim().length === 0) {
      throw new Error('League ID is required');
    }

    if (!props.name || props.name.trim().length === 0) {
      throw new Error('League name is required');
    }

    if (props.name.length > 100) {
      throw new Error('League name must be 100 characters or less');
    }

    if (!props.description || props.description.trim().length === 0) {
      throw new Error('League description is required');
    }

    if (!props.ownerId || props.ownerId.trim().length === 0) {
      throw new Error('League owner ID is required');
    }
  }

  /**
   * Create a copy with updated properties
   */
  update(props: Partial<{
    name: string;
    description: string;
    settings: LeagueSettings;
  }>): League {
    return new League({
      id: this.id,
      name: props.name ?? this.name,
      description: props.description ?? this.description,
      ownerId: this.ownerId,
      settings: props.settings ?? this.settings,
      createdAt: this.createdAt,
    });
  }
}