import { DataGrid, GridColDef, GridRenderCellParams } from "@mui/x-data-grid";
import { ruRU } from "@mui/x-data-grid/locales";
import { authStore, carrierStore, cityStore, languageStore, selectedCityStore, SearchInput } from "@shared";
import { useEffect, useState, useMemo } from "react";
import { observer } from "mobx-react-lite";
import { Pencil, Trash2, Minus } from "lucide-react";
import { useNavigate } from "react-router-dom";
import { CreateButton, DeleteModal, LanguageSwitcher } from "@widgets";
import { Box, CircularProgress } from "@mui/material";

export const CarrierListPage = observer(() => {
  const { carriers, getCarriers, deleteCarrier } = carrierStore;
  const navigate = useNavigate();
  const [isDeleteModalOpen, setIsDeleteModalOpen] = useState(false);
  const [isBulkDeleteModalOpen, setIsBulkDeleteModalOpen] = useState(false);
  const [rowId, setRowId] = useState<number | null>(null);
  const [ids, setIds] = useState<number[]>([]);
  const [isLoading, setIsLoading] = useState(false);
  const [paginationModel, setPaginationModel] = useState({
    page: 0,
    pageSize: 50,
  });
  const { language } = languageStore;
  const canReadCities = authStore.canRead("cities");
  const [searchQuery, setSearchQuery] = useState("");

  useEffect(() => {
    const fetchData = async () => {
      setIsLoading(true);
      if (!authStore.me) {
        await authStore.getMeAction().catch(() => undefined);
      }
      if (authStore.canRead("cities")) {
        await cityStore.getCities(language);
      } else {
        await authStore.fetchMeCities().catch(() => undefined);
      }
      await getCarriers(language);
      setIsLoading(false);
    };
    fetchData();
  }, [language, selectedCityStore.cityVersion]);

  const columns: GridColDef[] = [
    {
      field: "full_name",
      headerName: "Полное имя",
      width: 300,
      renderCell: (params: GridRenderCellParams) => {
        return (
          <div className="w-full h-full flex items-center">
            {params.value ? (
              params.value
            ) : (
              <Minus size={20} className="text-red-500" />
            )}
          </div>
        );
      },
    },
    {
      field: "short_name",
      headerName: "Короткое имя",
      width: 200,
      renderCell: (params: GridRenderCellParams) => {
        return (
          <div className="w-full h-full flex items-center">
            {params.value ? (
              params.value
            ) : (
              <Minus size={20} className="text-red-500" />
            )}
          </div>
        );
      },
    },
    {
      field: "city_id",
      headerName: "Город",
      flex: 1,
      renderCell: (params: GridRenderCellParams) => {
        const lang = language as "ru" | "en" | "zh";
        const cityName = canReadCities
          ? cityStore.cities[lang]?.data.find((c) => c.id === params.value)?.name
          : authStore.meCities[lang]?.find((c) => c.city_id === params.value)?.name;
        return (
          <div className="w-full h-full flex items-center">
            {cityName ?? <Minus size={20} className="text-red-500" />}
          </div>
        );
      },
    },
    ...(authStore.canWrite("carriers") ? [{
      field: "actions",
      headerName: "Действия",
      headerAlign: "center" as const,
      width: 200,
      sortable: false,
      renderCell: (params: GridRenderCellParams) => (
        <div className="flex h-full gap-7 justify-center items-center">
          <button title="Редактировать" onClick={() => navigate(`/carrier/${params.row.id}/edit`)}>
            <Pencil size={20} className="text-blue-500" />
          </button>
          <button
            title="Удалить"
            onClick={() => {
              setIsDeleteModalOpen(true);
              setRowId(params.row.id);
            }}
          >
            <Trash2 size={20} className="text-red-500" />
          </button>
        </div>
      ),
    }] : []),
  ];

  const allowedCityIds = canReadCities
    ? null
    : authStore.meCities["ru"].map((c) => c.city_id);

  const canWriteCarriers = authStore.canWrite("carriers");

  const rows = useMemo(() => {
    const query = searchQuery.trim().toLowerCase();
    return (carriers[language].data ?? [])
      .filter((carrier) => !allowedCityIds || allowedCityIds.includes(carrier.city_id))
      .filter(
        (carrier) =>
          !query ||
          (carrier.full_name ?? "").toLowerCase().includes(query) ||
          (carrier.short_name ?? "").toLowerCase().includes(query)
      )
      .map((carrier) => ({
        id: carrier.id,
        full_name: carrier.full_name,
        short_name: carrier.short_name,
        city_id: carrier.city_id,
      }));
  }, [carriers[language].data, searchQuery, allowedCityIds]);

  return (
    <>
      <LanguageSwitcher />
      <div className="w-full">
        <div className="flex justify-between items-center mb-10">
          <h1 className="text-2xl">Перевозчики</h1>
          {canWriteCarriers && (
            <CreateButton label="Создать перевозчика" path="/carrier/create" />
          )}
        </div>

        {canWriteCarriers && ids.length > 0 && (
          <div className="flex justify-end mb-5 duration-300">
            <button
              className="px-4 py-2 bg-red-500 text-white rounded flex gap-2 items-center"
              onClick={() => setIsBulkDeleteModalOpen(true)}
            >
              <Trash2 size={20} className="text-white" /> Удалить выбранные (
              {ids.length})
            </button>
          </div>
        )}

        {rows.length > 0 && (
          <SearchInput value={searchQuery} onChange={setSearchQuery} />
        )}

        <DataGrid
          rows={rows}
          columns={columns}
          checkboxSelection={canWriteCarriers}
          disableRowSelectionExcludeModel
          disableRowSelectionOnClick
          onRowDoubleClick={(params) => {
            if (canWriteCarriers) {
              navigate(`/carrier/${params.id}/edit`);
            }
          }}
          loading={isLoading}
          paginationModel={paginationModel}
          onPaginationModelChange={setPaginationModel}
          pageSizeOptions={[50]}
          localeText={ruRU.components.MuiDataGrid.defaultProps.localeText}
          onRowSelectionModelChange={
            canWriteCarriers
              ? (newSelection: any) => {
                  if (Array.isArray(newSelection)) {
                    const selectedIds = newSelection.map(Number);
                    setIds(selectedIds);
                  } else if (
                    newSelection &&
                    typeof newSelection === "object" &&
                    "ids" in newSelection
                  ) {
                    const idsSet = newSelection.ids as Set<string | number>;
                    const selectedIds = Array.from(idsSet).map(Number);
                    setIds(selectedIds);
                  } else {
                    setIds([]);
                  }
                }
              : undefined
          }
          slots={{
            noRowsOverlay: () => (
              <Box sx={{ mt: 5, textAlign: "center", color: "text.secondary" }}>
                {isLoading ? (
                  <CircularProgress size={20} />
                ) : (
                  "Нет перевозчиков"
                )}
              </Box>
            ),
          }}
        />
      </div>

      <DeleteModal
        open={isDeleteModalOpen}
        onDelete={async () => {
          if (rowId) {
            await deleteCarrier(rowId);
          }
          setIsDeleteModalOpen(false);
          setRowId(null);
        }}
        onCancel={() => {
          setIsDeleteModalOpen(false);
          setRowId(null);
        }}
      />

      <DeleteModal
        open={isBulkDeleteModalOpen}
        onDelete={async () => {
          await Promise.all(ids.map((id) => deleteCarrier(id)));
          await getCarriers(language);
          setIsBulkDeleteModalOpen(false);
          setIds([]);
        }}
        onCancel={() => {
          setIsBulkDeleteModalOpen(false);
        }}
      />
    </>
  );
});