// calculator.ts
export enum OperationType {
  SUM = 'sum',
  SUBTRACT = 'subtract',
  MULTIPLY = 'multiply',
  DIVIDE = 'divide'
}

export class CalculationError extends Error {
  constructor(message: string) {
    super(message);
    this.name = 'CalculationError';
  }
}

export interface Operation {
  execute(a: number, b: number): number;
}

export class Calculator {
  private operations: Map;

  constructor() {
    this.operations = new Map();
  }

  registerOperation(type: OperationType, operation: Operation): void {
    this.operations.set(type, operation);
  }

  calculate(a: number, b: number, type: OperationType): number {
    const operation = this.operations.get(type);
    
    if (!operation) {
      throw new CalculationError(`Operation ${type} not supported`);
    }
    
    return operation.execute(a, b);
  }
}