/**
 * @fileoverview
 *
 * This file holds the utilities to build the options to render in the select field and it could be loaded on client side as well.
 */
import type { z } from "zod";

import type { zodFieldView } from "../zod";

type Field = z.infer<typeof zodFieldView>;

const buildOptionsFromLegacySelectText = ({ legacySelectText }: { legacySelectText: string }) => {
  return legacySelectText
    .trim()
    .split("\n")
    .map((fieldValue) => ({
      label: fieldValue,
      id: null,
    }));
};

export const getFieldWithOptions = <T extends Field>(field: T) => {
  const legacySelectText = field.selectText;
  if (field.options) {
    return {
      ...field,
      options: field.options,
    };
  } else if (legacySelectText) {
    const options = buildOptionsFromLegacySelectText({ legacySelectText });
    return {
      ...field,
      options,
    };
  }
  return {
    ...field,
  } as typeof field & z.BRAND<"FIELD_WITH_OPTIONS">;
};

export function areSelectOptionsInLegacyFormat(
  field: Pick<Field, "options"> & z.BRAND<"FIELD_WITH_OPTIONS">
) {
  const options = field.options || [];
  return !!options.find((option) => !option.id);
}

export function getUIOptionsForSelect(field: Field) {
  const fieldWithOptions = getFieldWithOptions(field);
  const options = fieldWithOptions.options || [];
  const areOptionsInLegacyFormat = areSelectOptionsInLegacyFormat(
    fieldWithOptions as typeof fieldWithOptions & z.BRAND<"FIELD_WITH_OPTIONS">
  );
  // Because for legacy saved options, routes must have labels in them instead of ids
  const shouldUseLabelAsValue = areOptionsInLegacyFormat;
  return options.map((option) => {
    // We prefer option.id as that doesn't change when we change the option text/label.
    // Fallback to option.label for fields saved in DB in old format which didn't have `options`
    const value = shouldUseLabelAsValue ? option.label : option.id ?? option.label;
    return {
      value,
      title: option.label,
    };
  });
}