import type {
  ColumnDef,
  OnChangeFn,
  PaginationState,
  SortingState,
  VisibilityState,
} from "@tanstack/react-table";
import {
  getCoreRowModel,
  getFilteredRowModel,
  getPaginationRowModel,
  getSortedRowModel,
  useReactTable,
} from "@tanstack/react-table";
import { useEffect, useLayoutEffect, useMemo, useState } from "react";

import type { EntityColumn } from "../components/entity-list";
import {
  readColumnVisibility,
  writeColumnVisibility,
} from "../lib/entity-column-visibility-storage";
import { ENTITY_PAGE_SIZES, entityListRange } from "../lib/entity-list";
import type { EntityTableNavigation } from "../lib/entity-table-navigation";
import {
  tableNavigationPage,
  tableNavigationSorting,
  tableNavigationValue,
} from "../lib/entity-table-navigation";
import { createTextMatcher } from "../lib/text-search";

const ENTITY_PAGE_SIZE_STORAGE_KEY = "entity-page-size";

function storedPageSize(): number {
  if (typeof window === "undefined") {
    return ENTITY_PAGE_SIZES[0];
  }
  try {
    const value = Number(window.localStorage.getItem(ENTITY_PAGE_SIZE_STORAGE_KEY));

    return (ENTITY_PAGE_SIZES as readonly number[]).includes(value) ? value : ENTITY_PAGE_SIZES[0];
  } catch {
    return ENTITY_PAGE_SIZES[0];
  }
}

export function useEntityTable<T extends { id: string }>({
  items,
  columns,
  locale,
  search,
  onSearchChange,
  filterKey,
  columnVisibilityStorageKey,
  navigation,
  initialSorting: requestedSorting,
  initialPagination,
}: {
  items: readonly T[];
  columns: readonly EntityColumn<T>[];
  locale: string;
  search: string | undefined;
  onSearchChange: ((value: string) => void) | undefined;
  filterKey: string;
  columnVisibilityStorageKey?: string | undefined;
  navigation?: EntityTableNavigation | undefined;
  initialSorting?: SortingState;
  initialPagination?: PaginationState;
}) {
  const [localSearch, setLocalSearch] = useState("");
  const currentSearch = search ?? localSearch;
  const sortableColumns = columns.filter((column) => column.id !== "actions" && column.value);
  const defaultColumn =
    sortableColumns.find((column) => column.defaultSort) ??
    sortableColumns.find((column) => column.id === "name") ??
    sortableColumns[0];
  const initialSorting: SortingState =
    requestedSorting ??
    (defaultColumn ? [{ id: defaultColumn.id, desc: defaultColumn.defaultSort === "desc" }] : []);
  const [localSorting, setLocalSorting] = useState<SortingState>(initialSorting);
  const sorting = navigation
    ? tableNavigationSorting(
        navigation.values,
        columns.map((column) => ({
          id: column.id,
          sortable: column.id !== "actions" && Boolean(column.value),
        })),
        initialSorting
      )
    : localSorting;
  const [visibility, setVisibility] = useState<VisibilityState>(() =>
    readColumnVisibility(columnVisibilityStorageKey)
  );
  const [previousStorageKey, setPreviousStorageKey] = useState(columnVisibilityStorageKey);

  if (previousStorageKey !== columnVisibilityStorageKey) {
    setPreviousStorageKey(columnVisibilityStorageKey);
    setVisibility(readColumnVisibility(columnVisibilityStorageKey));
  }
  useEffect(() => {
    if (previousStorageKey === columnVisibilityStorageKey) {
      writeColumnVisibility(columnVisibilityStorageKey, visibility);
    }
  }, [columnVisibilityStorageKey, previousStorageKey, visibility]);
  const [localPagination, setLocalPagination] = useState<PaginationState>(
    () => initialPagination ?? { pageIndex: 0, pageSize: storedPageSize() }
  );
  const pagination = navigation
    ? { ...localPagination, pageIndex: tableNavigationPage(navigation.values.page) }
    : localPagination;

  const setSorting: OnChangeFn<SortingState> = (update) => {
    const next = typeof update === "function" ? update(sorting) : update;

    if (navigation) {
      navigation.onChange(tableNavigationValue(next, initialSorting, 0));
    } else {
      setLocalSorting(next);
    }
  };

  const setPagination: OnChangeFn<PaginationState> = (update) => {
    const next = typeof update === "function" ? update(pagination) : update;

    if (!navigation) {
      setLocalPagination(next);

      return;
    }
    if (next.pageSize !== localPagination.pageSize) {
      // Con control externo solo el tamaño es preferencia local; el índice pertenece al consumidor.
      setLocalPagination((previous) => ({ ...previous, pageSize: next.pageSize }));
    }
    navigation.onChange(tableNavigationValue(sorting, initialSorting, next.pageIndex));
  };

  useEffect(() => {
    try {
      window.localStorage.setItem(ENTITY_PAGE_SIZE_STORAGE_KEY, String(pagination.pageSize));
    } catch {
      // La paginación sigue funcionando aunque el almacenamiento no esté disponible.
    }
  }, [pagination.pageSize]);
  const resetKey = `${currentSearch}\0${filterKey}`;
  const [previousKey, setPreviousKey] = useState(resetKey);

  if (previousKey !== resetKey) {
    setPreviousKey(resetKey);
    if (!navigation) {
      setLocalPagination((previous) => ({ ...previous, pageIndex: 0 }));
    }
  }
  const nameCollator = useMemo(
    () => new Intl.Collator(locale, { sensitivity: "base", numeric: true }),
    [locale]
  );
  const definitions = useMemo<ColumnDef<T>[]>(
    () =>
      columns.map((column) => ({
        id: column.id,
        header: column.label,
        accessorFn: column.value ?? (() => ""),
        sortingFn:
          column.id === "name"
            ? (first, second, columnId) =>
                nameCollator.compare(
                  String(first.getValue(columnId) ?? ""),
                  String(second.getValue(columnId) ?? "")
                )
            : "auto",
        enableSorting: column.id !== "actions" && !!column.value,
        enableGlobalFilter: column.id !== "actions" && !!column.value,
        enableHiding: column.id !== "actions" && column.hideable !== false,
      })),
    [columns, nameCollator]
  );
  const matchesSearch = createTextMatcher(currentSearch);
  const table = useReactTable({
    data: [...items],
    columns: definitions,
    initialState: { sorting: initialSorting },
    enableSortingRemoval: false,
    getRowId: (item) => item.id,
    state: {
      sorting,
      columnVisibility: Object.fromEntries(
        columns.map((column) => [
          column.id,
          column.hideable === false || column.id === "actions"
            ? true
            : (visibility[column.id] ?? column.defaultVisible ?? true),
        ])
      ),
      columnPinning: {
        right: columns.filter((column) => column.id === "actions").map((column) => column.id),
      },
      pagination,
      globalFilter: onSearchChange ? "" : currentSearch.trim(),
    },
    onSortingChange: setSorting,
    onColumnVisibilityChange: setVisibility,
    onPaginationChange: setPagination,
    autoResetPageIndex: false,
    globalFilterFn: (row, columnId) => matchesSearch(row.getValue(columnId)),
    getCoreRowModel: getCoreRowModel(),
    getFilteredRowModel: getFilteredRowModel(),
    getSortedRowModel: getSortedRowModel(),
    getPaginationRowModel: getPaginationRowModel(),
  });
  const total = table.getFilteredRowModel().rows.length;
  const range = entityListRange(total, pagination.pageIndex, pagination.pageSize);

  // Una actualización puede reducir el conjunto sin cambiar los filtros.
  if (!navigation && pagination.pageIndex !== range.page) {
    setLocalPagination({ ...pagination, pageIndex: range.page });
  }
  const {
    sort: canonicalSort,
    direction: canonicalDirection,
    page: canonicalPage,
  } = tableNavigationValue(sorting, initialSorting, range.page);

  // Sincroniza únicamente la frontera externa (URL), una vez válidos datos y definiciones.
  useLayoutEffect(() => {
    if (!navigation?.ready) {
      return;
    }
    const { values } = navigation;

    if (
      values.sort !== (canonicalSort ?? null) ||
      values.direction !== (canonicalDirection ?? null) ||
      values.page !== (canonicalPage > 1 ? String(canonicalPage) : null)
    ) {
      navigation.onChange({
        sort: canonicalSort,
        direction: canonicalDirection,
        page: canonicalPage,
      });
    }
  }, [navigation, canonicalSort, canonicalDirection, canonicalPage]);

  return {
    table,
    total,
    range,
    pagination,
    setPagination,
    sorting,
    setSorting,
    currentSearch,
    setLocalSearch,
  };
}