import { useMemo } from "react";
import { type Resolver } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import {
  vendorCompanyRosterSchema,
  type VendorCompanyRosterFormValues,
} from "@/domain/vendors/schemas/vendor-roster-schema";
import { getSingleStatusOnlyChange } from "@/domain/vendors/use-cases/use-save-vendor-company-roster";
import type { VendorCompanyRoster } from "@/domain/vendors/types/vendor";

function withoutTechnicianStubs(
  values: VendorCompanyRosterFormValues,
): VendorCompanyRosterFormValues {
  return {
    ...values,
    technicians: values.technicians.filter((technician) => {
      if (technician === null || typeof technician !== "object" || Array.isArray(technician)) {
        return true;
      }
      const candidate = technician as unknown as Record<string, unknown>;
      const keys = Object.keys(candidate);
      const isGeneratedStatusStub =
        keys.length === 1 && keys[0] === "isActive" && typeof candidate.isActive === "boolean";
      return !isGeneratedStatusStub;
    }),
  };
}

export function useVendorRosterResolver(
  routeRoster: VendorCompanyRoster | undefined,
): Resolver<VendorCompanyRosterFormValues> {
  const strictResolver = useMemo(() => zodResolver(vendorCompanyRosterSchema), []);
  return useMemo<Resolver<VendorCompanyRosterFormValues>>(
    () => async (values, context, options) => {
      const normalizedValues = withoutTechnicianStubs(values);
      if (routeRoster && getSingleStatusOnlyChange(routeRoster, normalizedValues)) {
        return { values: normalizedValues, errors: {} };
      }
      return strictResolver(normalizedValues, context, options);
    },
    [routeRoster, strictResolver],
  );
}