"use client";

import {
  useCallback,
  useEffect,
  useMemo,
  useState,
  useTransition,
} from "react";
import {
  DataGrid,
  GridColDef,
  GridPaginationModel,
  GridSortModel,
} from "@mui/x-data-grid";
import TextField from "@mui/material/TextField";
import { Box, debounce } from "@mui/material";
import { usePathname, useRouter, useSearchParams } from "next/navigation";

import { AuditRow } from "./auditTransforms";
import { PAGE_SIZE_OPTIONS } from "./auditConstants";
import {
  buildSortParam,
  deriveColumns,
  parseSortModel,
  toTitle,
} from "./utils";

const FALLBACK_COLUMNS: GridColDef[] = [
  {
    field: "placeholder",
    headerName: "Audit Data",
    flex: 1,
    sortable: false,
    filterable: false,
  },
];

interface AuditTableClientProps {
  rows: AuditRow[];
  total: number;
  pageIndex: number;
  pageSize: number;
  sortParam?: string;
  entityQuery?: string;
}

export default function AuditTableClient({
  rows,
  total,
  pageIndex,
  pageSize,
  sortParam,
  entityQuery = "",
}: AuditTableClientProps) {
  const router = useRouter();
  const pathname = usePathname();
  const searchParams = useSearchParams();
  const searchParamsString = searchParams.toString();
  const [isNavigating, startTransition] = useTransition();

  // Derive values directly from props
  const paginationModel = useMemo<GridPaginationModel>(
    () => ({
      page: pageIndex,
      pageSize,
    }),
    [pageIndex, pageSize]
  );

  const sortModel = useMemo(() => parseSortModel(sortParam), [sortParam]);
  const columns = useMemo(
    () => (rows.length ? deriveColumns(rows) : FALLBACK_COLUMNS),
    [rows]
  );

  // Only entitySearchInput needs state since it's a controlled input
  const normalizedEntityQuery = entityQuery.trim();
  const [entitySearchInput, setEntitySearchInput] = useState<string>(
    normalizedEntityQuery
  );

  // Sync entity input when query prop changes (e.g., from URL navigation)
  useEffect(() => {
    setEntitySearchInput(normalizedEntityQuery);
  }, [normalizedEntityQuery]);

  const pageTitle = useMemo(
    () =>
      sortModel.length && sortModel[0].field
        ? `Audit Logs · sorted by ${toTitle(sortModel[0].field)}`
        : "Audit Logs",
    [sortModel]
  );

  const navigateWithParams = useCallback(
    (updates: Record<string, string | null | undefined>) => {
      const params = new URLSearchParams(searchParamsString);

      Object.entries(updates).forEach(([key, value]) => {
        if (!value) {
          params.delete(key);
        } else {
          params.set(key, value);
        }
      });

      startTransition(() => {
        const queryString = params.toString();
        router.push(queryString ? `${pathname}?${queryString}` : pathname);
      });
    },
    [pathname, router, searchParamsString, startTransition]
  );

  const debouncedEntityNavigate = useMemo(
    () =>
      debounce((value: string) => {
        navigateWithParams({
          page: "1",
          entity: value.trim() ? value.trim() : null,
        });
      }, 500),
    [navigateWithParams]
  );

  useEffect(() => {
    return () => {
      debouncedEntityNavigate.clear();
    };
  }, [debouncedEntityNavigate]);

  const handlePaginationChange = (model: GridPaginationModel) => {
    navigateWithParams({
      page: String(model.page + 1),
      limit: String(model.pageSize),
    });
  };

  const handleSortModelChange = (model: GridSortModel) => {
    navigateWithParams({
      page: "1",
      sort: buildSortParam(model) ?? null,
    });
  };

  const handleEntitySearchChange = (value: string) => {
    setEntitySearchInput(value);
    debouncedEntityNavigate(value);
  };

  const loading = isNavigating;

  return (
    <div className="audits-page">
      <Box sx={{ display: "flex", gap: 2, mt: 5 }}>
        <TextField
          label="Search by Entity"
          variant="outlined"
          size="small"
          value={entitySearchInput}
          onChange={e => handleEntitySearchChange(e.target.value)}
          sx={{ width: 300, backgroundColor: "#f0f0f0" }}
        />
      </Box>
      <h1 className="page-title">{pageTitle}</h1>
      <div className="table-container">
        <div className="scroll-wrapper">
          <div
            className="table-inner"
            style={{ minWidth: `${columns.length * 200}px` }}
          >
            <DataGrid
              rows={rows}
              columns={columns.length ? columns : FALLBACK_COLUMNS}
              loading={loading}
              paginationMode="server"
              sortingMode="server"
              paginationModel={paginationModel}
              onPaginationModelChange={handlePaginationChange}
              rowCount={total}
              sortModel={sortModel}
              onSortModelChange={handleSortModelChange}
              pageSizeOptions={[...PAGE_SIZE_OPTIONS]}
              disableRowSelectionOnClick
              sx={{
                border: 0,
                minHeight: 500,
                "& .MuiDataGrid-cell": {
                  whiteSpace: "nowrap",
                  overflow: "hidden",
                  textOverflow: "ellipsis",
                },
              }}
            />
          </div>
        </div>
      </div>
    </div>
  );
}