cal.pub0.org/packages/features/bookings/Booker/components/BookEventForm/BookingFields.tsx

import { useFormContext } from "react-hook-form";

import type { LocationObject } from "@calcom/app-store/locations";
import getLocationOptionsForSelect from "@calcom/features/bookings/lib/getLocationOptionsForSelect";
import { FormBuilderField } from "@calcom/features/form-builder";
import { useLocale } from "@calcom/lib/hooks/useLocale";
import type { RouterOutputs } from "@calcom/trpc/react";

import { SystemField } from "../../../lib/getBookingFields";

export const BookingFields = ({
  fields,
  locations,
  rescheduleUid,
  isDynamicGroupBooking,
}: {
  fields: NonNullable<RouterOutputs["viewer"]["public"]["event"]>["bookingFields"];
  locations: LocationObject[];
  rescheduleUid?: string;
  isDynamicGroupBooking: boolean;
}) => {
  const { t } = useLocale();
  const { watch, setValue } = useFormContext();
  const locationResponse = watch("responses.location");
  const currentView = rescheduleUid ? "reschedule" : "";

  return (
    // TODO: It might make sense to extract this logic into BookingFields config, that would allow to quickly configure system fields and their editability in fresh booking and reschedule booking view
    <div>
      {fields.map((field, index) => {
        // During reschedule by default all system fields are readOnly. Make them editable on case by case basis.
        // Allowing a system field to be edited might require sending emails to attendees, so we need to be careful
        let readOnly =
          (field.editable === "system" || field.editable === "system-but-optional") && !!rescheduleUid;

        let noLabel = false;
        let hidden = !!field.hidden;
        const fieldViews = field.views;

        if (fieldViews && !fieldViews.find((view) => view.id === currentView)) {
          return null;
        }

        if (field.name === SystemField.Enum.rescheduleReason) {
          // rescheduleReason is a reschedule specific field and thus should be editable during reschedule
          readOnly = false;
        }

        if (field.name === SystemField.Enum.smsReminderNumber) {
          // `smsReminderNumber` and location.optionValue when location.value===phone are the same data point. We should solve it in a better way in the Form Builder itself.
          // I think we should have a way to connect 2 fields together and have them share the same value in Form Builder
          if (locationResponse?.value === "phone") {
            setValue(`responses.${SystemField.Enum.smsReminderNumber}`, locationResponse?.optionValue);
            // Just don't render the field now, as the value is already connected to attendee phone location
            return null;
          }
          // `smsReminderNumber` can be edited during reschedule even though it's a system field
          readOnly = false;
        }

        if (field.name === SystemField.Enum.guests) {
          // No matter what user configured for Guests field, we don't show it for dynamic group booking as that doesn't support guests
          hidden = isDynamicGroupBooking ? true : !!field.hidden;
        }

        // We don't show `notes` field during reschedule
        if (
          (field.name === SystemField.Enum.notes || field.name === SystemField.Enum.guests) &&
          !!rescheduleUid
        ) {
          return null;
        }

        // Dynamically populate location field options
        if (field.name === SystemField.Enum.location && field.type === "radioInput") {
          if (!field.optionsInputs) {
            throw new Error("radioInput must have optionsInputs");
          }
          const optionsInputs = field.optionsInputs;

          // TODO: Instead of `getLocationOptionsForSelect` options should be retrieved from dataStore[field.getOptionsAt]. It would make it agnostic of the `name` of the field.
          const options = getLocationOptionsForSelect(locations, t);
          options.forEach((option) => {
            const optionInput = optionsInputs[option.value as keyof typeof optionsInputs];
            if (optionInput) {
              optionInput.placeholder = option.inputPlaceholder;
            }
          });

          field.options = options.filter(
            (location): location is NonNullable<(typeof options)[number]> => !!location
          );
          // If we have only one option and it has an input, we don't show the field label because Option name acts as label.
          // e.g. If it's just Attendee Phone Number option then we don't show `Location` label
          if (field.options.length === 1) {
            if (field.optionsInputs[field.options[0].value]) {
              noLabel = true;
            } else {
              // If there's only one option and it doesn't have an input, we don't show the field at all because it's visible in the left side bar
              hidden = true;
            }
          }
        }

        const label = noLabel ? "" : field.label || t(field.defaultLabel || "");
        const placeholder = field.placeholder || t(field.defaultPlaceholder || "");

        return (
          <FormBuilderField
            className="mb-4"
            field={{ ...field, label, placeholder, hidden }}
            readOnly={readOnly}
            key={index}
          />
        );
      })}
    </div>
  );
};