// TODO: refactoriza este código — extrae constantes, mejora nombres y crea funciones auxiliares
type TypeOfCars = 'economy' | 'standard' | 'premium';

interface CarTypeFee {
	type: TypeOfCars;
	fee: number;
}

const ECONOMY_CAR_FEE = 35;
const STANDARD_CAR_FEE = 55;
const PREMIUM_CAR_FEE = 90;
//
const ECONOMY_CAR: CarTypeFee = {
	type: 'economy',
	fee: ECONOMY_CAR_FEE,
};
const STANDARD_CAR: CarTypeFee = {
	type: 'standard',
	fee: STANDARD_CAR_FEE,
};
const PREMIUM_CAR: CarTypeFee = {
	type: 'premium',
	fee: PREMIUM_CAR_FEE,
};
const CAR_TYPES = {
	economy: ECONOMY_CAR,
	standard: STANDARD_CAR,
	premium: PREMIUM_CAR,
};
const INVALID_TYPE = -1;
//
const MIN_RENTING_DAYS = 0;
const MIN_DAYS_PER_LARGE_DISCOUNT = 14;
const MIN_DAYS_PER_REGULAR_DISCOUNT = 7;
//
const LARGE_DISCOUNT = 0.2;
const REGULAR_DISCOUNT = 0.1;
const NOT_DISCOUNT = 1;
//
const NOT_VALID_VALUE = -1;
const DAILY_INSURANCE_RATE = 15;

// TARIFA DIARIA según tipo de coche
function getDailyRate(carType: TypeOfCars) {
	//
	switch (carType) {
		case 'economy':
			return ECONOMY_CAR.fee;
		case 'standard':
			return STANDARD_CAR.fee;
		case 'premium':
			return PREMIUM_CAR.fee;
		default:
			return INVALID_TYPE;
	}
}

// DESCUENTO, relación a aplicar al subtotal
function getDiscountRatio(rentingDays: number) {
	//
	if (rentingDays >= MIN_DAYS_PER_LARGE_DISCOUNT) return 1 - LARGE_DISCOUNT;
	//
	if (rentingDays >= MIN_DAYS_PER_REGULAR_DISCOUNT) return 1 - REGULAR_DISCOUNT;

	return NOT_DISCOUNT;
}

export function calculateCarRentalCost(
	rentingDays: number,
	carType: TypeOfCars,
	hasInsurance: boolean,
): number {
	// Verificar que los días sean válidos
	if (rentingDays <= MIN_RENTING_DAYS) {
		return NOT_VALID_VALUE;
	}

	// Verificar el tipo de coche
	if (!(carType in CAR_TYPES)) {
		return INVALID_TYPE;
	}
	// Determinar la tarifa base según el tipo de auto
	const RATE_PER_DAY = getDailyRate(carType);

	let subTotal = RATE_PER_DAY * rentingDays;

	// Aplicar descuento según los días rentados
	const DISCOUNT_RATIO = getDiscountRatio(rentingDays);
	let total = subTotal * DISCOUNT_RATIO;

	// Agregar costo del seguro si aplica
	if (hasInsurance) {
		total += DAILY_INSURANCE_RATE * rentingDays;
	}

	return total;
}