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import { MAX_SLOTS } from "@/utils/Constants";
/** Subservice type used in slot calculations */
export interface SlotSubservice {
id?: string;
count: number;
providers: OfficeImpl[];
}
/**
* Gets the maximum slots required for a service across all providers.
* We use MAX (not min) because we need to ensure the booking works at
* providers with higher slot requirements. If a service takes 3 slots
* at most providers but 1 slot at one provider, we count 3 slots to be
* conservative with the slot limit.
*/
export const getMaxSlotOfProvider = (providers: OfficeImpl[]): number => {
let maxSlot = 1; // Default to 1 slot minimum
providers.forEach((provider) => {
if (provider.slots && provider.slots > maxSlot) {
maxSlot = provider.slots;
}
});
return maxSlot;
};
/**
* Gets the minimum slotsPerAppointment across all providers.
* We use MIN (not max) because we need to ensure the booking works at
* ALL providers that offer this service. If Provider A allows 10 slots
* and Provider B allows 3 slots, we must limit to 3 to work everywhere.
*/
export const getMinSlotsPerAppointmentOfProvider = (
providers: OfficeImpl[]
): number => {
let minSlot = 0;
providers.forEach((provider) => {
if (
provider.slotsPerAppointment &&
parseInt(provider.slotsPerAppointment) > 0
) {
const providerSlots = parseInt(provider.slotsPerAppointment);
if (minSlot === 0 || providerSlots < minSlot) {
minSlot = providerSlots;
}
}
});
return minSlot;
};
/**
* Calculates the effective minSlotsPerAppointment, applying MAX_SLOTS as fallback.
*/
export const getEffectiveMinSlotsPerAppointment = (
providers: OfficeImpl[]
): number => {
const minSlotsOfProvider = getMinSlotsPerAppointmentOfProvider(providers);
return minSlotsOfProvider > 0
? Math.min(minSlotsOfProvider, MAX_SLOTS)
: MAX_SLOTS;
};
/**
* Calculates the total slots used by a list of subservices.
*/
export const calculateSubserviceSlots = (
subServices: SlotSubservice[] | undefined
): number => {
if (!subServices) return 0;
let slots = 0;
subServices.forEach((subservice) => {
if (subservice.count > 0) {
slots += getMaxSlotOfProvider(subservice.providers) * subservice.count;
}
});
return slots;
};
/**
* Calculates the total slots for an appointment (main service + all subservices).
*/
export const calculateTotalSlots = (
mainServiceProviders: OfficeImpl[],
mainServiceCount: number,
subServices: SlotSubservice[] | undefined
): number => {
const mainSlots =
getMaxSlotOfProvider(mainServiceProviders) * mainServiceCount;
const subSlots = calculateSubserviceSlots(subServices);
return mainSlots + subSlots;
};
/**
* Calculates the maximum allowed count for a service based on slot constraints.
*
* @param serviceSlots - Slots required per unit of this service
* @param maxQuantity - The service's own quantity limit
* @param minSlotsPerAppointment - Total slots allowed for the appointment
* @param otherSlotsUsed - Slots already used by other services
* @returns The maximum count allowed (at least 0)
*/
export const calculateMaxCountBySlots = (
serviceSlots: number,
maxQuantity: number,
minSlotsPerAppointment: number,
otherSlotsUsed: number
): number => {
if (serviceSlots <= 0) return maxQuantity;
const availableSlots = minSlotsPerAppointment - otherSlotsUsed;
const maxCountBySlots = Math.floor(availableSlots / serviceSlots);
return Math.max(0, Math.min(maxQuantity, maxCountBySlots));
};
/**
* Checks if total slots exceed the limit.
*/
export const exceedsSlotLimit = (
totalSlots: number,
minSlotsPerAppointment: number
): boolean => {
return minSlotsPerAppointment > 0 && totalSlots > minSlotsPerAppointment;
};
/**
* Adjusts the main service count to fit within slot limits.
* When at least one unit fits, count stays at least 1 (same as before the zero-count
* path). Returns 0 only when quantity 1 already exceeds slotsPerAppointment.
*/
export const adjustMainServiceCount = (
requestedCount: number,
mainServiceProviders: OfficeImpl[],
subServiceSlots: number,
minSlotsPerAppointment: number
): { adjustedCount: number; totalSlots: number } => {
const mainServiceSlots = getMaxSlotOfProvider(mainServiceProviders);
const maxMainCount =
mainServiceSlots > 0
? Math.floor(
(minSlotsPerAppointment - subServiceSlots) / mainServiceSlots
)
: requestedCount;
if (minSlotsPerAppointment > 0 && maxMainCount < 1) {
return { adjustedCount: 0, totalSlots: subServiceSlots };
}
const adjustedCount = Math.max(
1,
Math.min(requestedCount || 1, maxMainCount)
);
return {
adjustedCount,
totalSlots: mainServiceSlots * adjustedCount + subServiceSlots,
};
};
/**
* Adjusts a subservice count to fit within slot limits.
* Returns the adjusted count and updated total slots.
*/
export const adjustSubserviceCount = (
requestedCount: number,
subserviceProviders: OfficeImpl[],
mainServiceSlots: number,
otherSubserviceSlots: number,
minSlotsPerAppointment: number
): { adjustedCount: number; totalSlots: number } => {
const subServiceSlots = getMaxSlotOfProvider(subserviceProviders);
const totalSlots =
mainServiceSlots + otherSubserviceSlots + subServiceSlots * requestedCount;
if (!exceedsSlotLimit(totalSlots, minSlotsPerAppointment)) {
return { adjustedCount: requestedCount, totalSlots };
}
const maxSubCount = Math.floor(
(minSlotsPerAppointment - mainServiceSlots - otherSubserviceSlots) /
subServiceSlots
);
const adjustedCount = Math.max(0, Math.min(requestedCount, maxSubCount));
const adjustedTotalSlots =
mainServiceSlots + otherSubserviceSlots + subServiceSlots * adjustedCount;
return { adjustedCount, totalSlots: adjustedTotalSlots };
};
/**
* Calculates slots used by other subservices (excluding a specific one).
*/
export const calculateOtherSubserviceSlots = (
subServices: SlotSubservice[] | undefined,
excludeId: string
): number => {
if (!subServices) return 0;
let slots = 0;
subServices.forEach((s) => {
if (s.id !== excludeId && s.count > 0) {
slots += getMaxSlotOfProvider(s.providers) * s.count;
}
});
return slots;
};
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