import { getLabel } from "./getLabel";
import { selectEmptyOptions } from "../config/constants";
import type { TOptionType, TSelectValue, TSelectUserValue } from "../config/types";

type TGetInitialValueParams = {
  value?: TSelectUserValue;
  isMulti?: boolean;
  options?: TOptionType[];
};

/**
 * Computes the initial value for the select component.
 * Converts raw value(s) into the shape expected by `react‑select`.
 * @returns {TSelectUserValue}
 */
export const getInitialValue = ({
  value,
  isMulti = false,
  options = selectEmptyOptions,
}: TGetInitialValueParams): TSelectValue<typeof isMulti> => {

  // value isn't provided
  if (!value) {
    return null;
  }

  if (isMulti) {

    // [ "str", "str" ]
    if (Array.isArray(value) && value.every((item) => typeof item === "string")) {
      return value.map((text) => ({
        label: getLabel(options, text),
        value: text,
      }));
    }

    // "str"
    if (typeof value === "string") {
      return [
        {
          label: getLabel(options, value),
          value,
        },
      ];
    }

    // valid array
    if (Array.isArray(value) && value.every((item) => typeof item === "object" && "label" in item && "value" in item && typeof item.label === "string" && typeof item.value === "string")) {
      return value as TSelectValue<true>;
    }

    // Invalid value
    return null;
  }

  // Single string value
  if (typeof value === "string" && value.length) {
    return { label: getLabel(options, value), value };
  }

  // Single IOptionType object (already in correct format)
  if (typeof value === "object" && value !== null && !Array.isArray(value) && "value" in value) {
    return value as TOptionType;
  }

  // Invalid value for single select
  console.debug(`[Select] Value has incorrect format and become "null"`);
  return null;
};