/**
 * Domain Entity: Penalty
 *
 * Represents a penalty applied to a driver for an incident during a race.
 * Penalties can be applied as a result of an upheld protest or directly by stewards.
 */
 
import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
import type { IEntity } from '@gridpilot/shared/domain';

export type PenaltyType =
  | 'time_penalty'        // Add time to race result (e.g., +5 seconds)
  | 'grid_penalty'        // Grid position penalty for next race
  | 'points_deduction'    // Deduct championship points
  | 'disqualification'    // DSQ from the race
  | 'warning'             // Official warning (no immediate consequence)
  | 'license_points'      // Add penalty points to license (safety rating)
  | 'probation'           // Conditional penalty
  | 'fine'                // Monetary/points fine
  | 'race_ban';           // Multi-race suspension

export type PenaltyStatus = 'pending' | 'applied' | 'appealed' | 'overturned';

export interface PenaltyProps {
  id: string;
  raceId: string;
  /** The driver receiving the penalty */
  driverId: string;
  /** Type of penalty */
  type: PenaltyType;
  /** Value depends on type: seconds for time_penalty, positions for grid_penalty, points for points_deduction */
  value?: number;
  /** Reason for the penalty */
  reason: string;
  /** ID of the protest that led to this penalty (if applicable) */
  protestId?: string;
  /** ID of the steward who issued the penalty */
  issuedBy: string;
  /** Current status of the penalty */
  status: PenaltyStatus;
  /** Timestamp when the penalty was issued */
  issuedAt: Date;
  /** Timestamp when the penalty was applied to results */
  appliedAt?: Date;
  /** Notes about the penalty application */
  notes?: string;
}

export class Penalty implements IEntity<string> {
  private constructor(private readonly props: PenaltyProps) {}

  static create(props: PenaltyProps): Penalty {
    if (!props.id) throw new RacingDomainValidationError('Penalty ID is required');
    if (!props.raceId) throw new RacingDomainValidationError('Race ID is required');
    if (!props.driverId) throw new RacingDomainValidationError('Driver ID is required');
    if (!props.type) throw new RacingDomainValidationError('Penalty type is required');
    if (!props.reason?.trim()) throw new RacingDomainValidationError('Penalty reason is required');
    if (!props.issuedBy) throw new RacingDomainValidationError('Penalty must be issued by a steward');
    
    // Validate value based on type
    if (['time_penalty', 'grid_penalty', 'points_deduction', 'license_points', 'fine', 'race_ban'].includes(props.type)) {
      if (props.value === undefined || props.value <= 0) {
        throw new RacingDomainValidationError(`${props.type} requires a positive value`);
      }
    }
    
    return new Penalty({
      ...props,
      status: props.status || 'pending',
      issuedAt: props.issuedAt || new Date(),
    });
  }

  get id(): string { return this.props.id; }
  get raceId(): string { return this.props.raceId; }
  get driverId(): string { return this.props.driverId; }
  get type(): PenaltyType { return this.props.type; }
  get value(): number | undefined { return this.props.value; }
  get reason(): string { return this.props.reason; }
  get protestId(): string | undefined { return this.props.protestId; }
  get issuedBy(): string { return this.props.issuedBy; }
  get status(): PenaltyStatus { return this.props.status; }
  get issuedAt(): Date { return this.props.issuedAt; }
  get appliedAt(): Date | undefined { return this.props.appliedAt; }
  get notes(): string | undefined { return this.props.notes; }

  isPending(): boolean {
    return this.props.status === 'pending';
  }

  isApplied(): boolean {
    return this.props.status === 'applied';
  }

  /**
   * Mark penalty as applied (after recalculating results)
   */
  markAsApplied(notes?: string): Penalty {
    if (this.isApplied()) {
      throw new RacingDomainInvariantError('Penalty is already applied');
    }
    if (this.props.status === 'overturned') {
      throw new RacingDomainInvariantError('Cannot apply an overturned penalty');
    }
    const base: PenaltyProps = {
      ...this.props,
      status: 'applied',
      appliedAt: new Date(),
    };

    const next: PenaltyProps =
      notes !== undefined ? { ...base, notes } : base;

    return Penalty.create(next);
  }

  /**
   * Overturn the penalty (e.g., after successful appeal)
   */
  overturn(reason: string): Penalty {
    if (this.props.status === 'overturned') {
      throw new RacingDomainInvariantError('Penalty is already overturned');
    }
    return new Penalty({
      ...this.props,
      status: 'overturned',
      notes: reason,
    });
  }

  /**
   * Get a human-readable description of the penalty
   */
  getDescription(): string {
    switch (this.props.type) {
      case 'time_penalty':
        return `+${this.props.value}s time penalty`;
      case 'grid_penalty':
        return `${this.props.value} place grid penalty (next race)`;
      case 'points_deduction':
        return `${this.props.value} championship points deducted`;
      case 'disqualification':
        return 'Disqualified from race';
      case 'warning':
        return 'Official warning';
      case 'license_points':
        return `${this.props.value} license penalty points`;
      case 'probation':
        return 'Probationary period';
      case 'fine':
        return `${this.props.value} points fine`;
      case 'race_ban':
        return `${this.props.value} race suspension`;
      default:
        return 'Penalty';
    }
  }
}