"use client";

import { parseAsArrayOf, parseAsJson, useQueryStates } from "nuqs";
import { useMemo } from "react";
import { z } from "zod";

import type { SelectFilterValue, TextFilterValue } from "./types";
import { ZSelectFilterValue, ZTextFilterValue } from "./types";

const filterSchema = z.object({
  f: z.string(),
  v: z.union([ZSelectFilterValue, ZTextFilterValue]),
});

export const filtersSearchParams = {
  activeFilters: parseAsArrayOf(parseAsJson(filterSchema.parse)).withDefault([]),
};

export function useFiltersSearchState() {
  return useQueryStates(filtersSearchParams);
}

export function useColumnFilters() {
  const [filtersSearchState] = useFiltersSearchState();
  const columnFilters = useMemo(() => {
    return (filtersSearchState.activeFilters || [])
      .map((filter) => ({
        id: filter.f,
        value: filter.v,
      }))
      .filter((filter) => {
        // The empty arrays in `filtersSearchState` keep the filter UI component,
        // but we do not send them to the actual query.
        // Otherwise, { value: [] } would result in nothing being returned.
        if (Array.isArray(filter.value) && filter.value.length === 0) {
          return false;
        }
        return true;
      });
  }, [filtersSearchState.activeFilters]);
  return columnFilters;
}

export type FiltersSearchState = ReturnType<typeof useFiltersSearchState>[0];
export type SetFiltersSearchState = ReturnType<typeof useFiltersSearchState>[1];
export type ActiveFilter = NonNullable<FiltersSearchState["activeFilters"]>[number];

export const textFilter = (cellValue: string, filterValue: TextFilterValue) => {
  switch (filterValue.data.operator) {
    case "equals":
      return cellValue.toLowerCase() === (filterValue.data.operand || "").toLowerCase();
    case "notEquals":
      return cellValue.toLowerCase() !== (filterValue.data.operand || "").toLowerCase();
    case "contains":
      return cellValue.toLowerCase().includes((filterValue.data.operand || "").toLowerCase());
    case "notContains":
      return !cellValue.toLowerCase().includes((filterValue.data.operand || "").toLowerCase());
    case "startsWith":
      return cellValue.toLowerCase().startsWith((filterValue.data.operand || "").toLowerCase());
    case "endsWith":
      return cellValue.toLowerCase().endsWith((filterValue.data.operand || "").toLowerCase());
    case "isEmpty":
      return cellValue.trim() === "";
    case "isNotEmpty":
      return cellValue.trim() !== "";
    default:
      return false;
  }
};

export const isTextFilterValue = (filterValue: unknown): filterValue is TextFilterValue => {
  return (
    typeof filterValue === "object" &&
    filterValue !== null &&
    "type" in filterValue &&
    filterValue.type === "text"
  );
};

export const isSelectFilterValue = (filterValue: unknown): filterValue is SelectFilterValue => {
  return Array.isArray(filterValue) && filterValue.every((item) => typeof item === "string");
};