/**
 * Domain Value Object: GameConstraints
 *
 * Represents game-specific constraints for leagues.
 * Different sim racing games have different maximum grid sizes.
 */

import type { IValueObject } from '@gridpilot/shared/domain';

export interface GameConstraintsData {
  readonly maxDrivers: number;
  readonly maxTeams: number;
  readonly defaultMaxDrivers: number;
  readonly minDrivers: number;
  readonly supportsTeams: boolean;
  readonly supportsMultiClass: boolean;
}

export interface GameConstraintsProps {
  gameId: string;
  constraints: GameConstraintsData;
}

/**
 * Game-specific constraints for popular sim racing games
 */
const GAME_CONSTRAINTS: Record<string, GameConstraintsData> & { default: GameConstraintsData } = {
  iracing: {
    maxDrivers: 64,
    maxTeams: 32,
    defaultMaxDrivers: 24,
    minDrivers: 2,
    supportsTeams: true,
    supportsMultiClass: true,
  },
  acc: {
    maxDrivers: 30,
    maxTeams: 15,
    defaultMaxDrivers: 24,
    minDrivers: 2,
    supportsTeams: true,
    supportsMultiClass: false,
  },
  rf2: {
    maxDrivers: 64,
    maxTeams: 32,
    defaultMaxDrivers: 24,
    minDrivers: 2,
    supportsTeams: true,
    supportsMultiClass: true,
  },
  ams2: {
    maxDrivers: 32,
    maxTeams: 16,
    defaultMaxDrivers: 20,
    minDrivers: 2,
    supportsTeams: true,
    supportsMultiClass: true,
  },
  lmu: {
    maxDrivers: 32,
    maxTeams: 16,
    defaultMaxDrivers: 24,
    minDrivers: 2,
    supportsTeams: true,
    supportsMultiClass: true,
  },
  // Default for unknown games
  default: {
    maxDrivers: 32,
    maxTeams: 16,
    defaultMaxDrivers: 20,
    minDrivers: 2,
    supportsTeams: true,
    supportsMultiClass: false,
  },
};

function getConstraintsForId(gameId: string): GameConstraintsData {
  const lower = gameId.toLowerCase();
  const fromMap = GAME_CONSTRAINTS[lower];
  if (fromMap) {
    return fromMap;
  }
  return GAME_CONSTRAINTS.default;
}

export class GameConstraints implements IValueObject<GameConstraintsProps> {
  readonly gameId: string;
  readonly constraints: GameConstraintsData;

  private constructor(gameId: string, constraints: GameConstraintsData) {
    this.gameId = gameId;
    this.constraints = constraints;
  }

  get props(): GameConstraintsProps {
    return {
      gameId: this.gameId,
      constraints: this.constraints,
    };
  }

  equals(other: IValueObject<GameConstraintsProps>): boolean {
    return this.props.gameId === other.props.gameId;
  }

  /**
   * Get constraints for a specific game
   */
  static forGame(gameId: string): GameConstraints {
    const constraints = getConstraintsForId(gameId);
    const lowerId = gameId.toLowerCase();
    return new GameConstraints(lowerId, constraints);
  }

  /**
   * Get all supported game IDs
   */
  static getSupportedGames(): string[] {
    return Object.keys(GAME_CONSTRAINTS).filter(id => id !== 'default');
  }

  /**
   * Maximum drivers allowed for this game
   */
  get maxDrivers(): number {
    return this.constraints.maxDrivers;
  }

  /**
   * Maximum teams allowed for this game
   */
  get maxTeams(): number {
    return this.constraints.maxTeams;
  }

  /**
   * Default driver count for new leagues
   */
  get defaultMaxDrivers(): number {
    return this.constraints.defaultMaxDrivers;
  }

  /**
   * Minimum drivers required
   */
  get minDrivers(): number {
    return this.constraints.minDrivers;
  }

  /**
   * Whether this game supports team-based leagues
   */
  get supportsTeams(): boolean {
    return this.constraints.supportsTeams;
  }

  /**
   * Whether this game supports multi-class racing
   */
  get supportsMultiClass(): boolean {
    return this.constraints.supportsMultiClass;
  }

  /**
   * Validate a driver count against game constraints
   */
  validateDriverCount(count: number): { valid: boolean; error?: string } {
    if (count < this.minDrivers) {
      return {
        valid: false,
        error: `Minimum ${this.minDrivers} drivers required`,
      };
    }
    if (count > this.maxDrivers) {
      return {
        valid: false,
        error: `Maximum ${this.maxDrivers} drivers allowed for ${this.gameId.toUpperCase()}`,
      };
    }
    return { valid: true };
  }

  /**
   * Validate a team count against game constraints
   */
  validateTeamCount(count: number): { valid: boolean; error?: string } {
    if (!this.supportsTeams) {
      return {
        valid: false,
        error: `${this.gameId.toUpperCase()} does not support team-based leagues`,
      };
    }
    if (count > this.maxTeams) {
      return {
        valid: false,
        error: `Maximum ${this.maxTeams} teams allowed for ${this.gameId.toUpperCase()}`,
      };
    }
    return { valid: true };
  }
}