import { useState, useMemo, useEffect, useCallback } from "react";
import {
  Table,
  TableHeader,
  TableColumn,
  TableBody,
  TableRow,
  TableCell,
  Button,
  DropdownTrigger,
  Dropdown,
  DropdownMenu,
  DropdownItem,
  Selection,
  SortDescriptor,
} from "@nextui-org/react";
import { Plus, MoreVertical, ChevronDown } from "lucide-react";

function capitalize(str: string) {
  return str.charAt(0).toUpperCase() + str.slice(1);
}

const columns = [
  { name: "ID", uid: "id", sortable: true },
  { name: "TITLE", uid: "title", sortable: true },
  { name: "PRIORITY", uid: "priority", sortable: true },
  { name: "ACTIONS", uid: "actions" },
];

const INITIAL_VISIBLE_COLUMNS = ["id", "title", "priority", "actions"];

type Case = {
  id: number;
  title: string;
  state: number;
  priority: number;
  type: number;
  automationStatus: number;
  description: string;
  template: number;
  preConditions: string;
  expectedResults: string;
  folderId: number;
  createdAt: string;
  updatedAt: string;
};

export default function TestCaseTable({ cases }) {
  const [filterValue, setFilterValue] = useState("");
  const [selectedKeys, setSelectedKeys] = useState<Selection>(new Set([]));
  const [visibleColumns, setVisibleColumns] = useState<Selection>(
    new Set(INITIAL_VISIBLE_COLUMNS)
  );
  const [statusFilter, setStatusFilter] = useState<Selection>("all");
  const [sortDescriptor, setSortDescriptor] = useState<SortDescriptor>({
    column: "id",
    direction: "ascending",
  });

  const hasSearchFilter = Boolean(filterValue);

  const headerColumns = useMemo(() => {
    if (visibleColumns === "all") {
      return columns;
    }

    return columns.filter((column) =>
      Array.from(visibleColumns).includes(column.uid)
    );
  }, [visibleColumns]);

  const filteredItems = useMemo(() => {
    let filteredCases = [...cases];

    if (hasSearchFilter) {
      filteredCases = filteredCases.filter((itr) =>
        itr.title.toLowerCase().includes(filterValue.toLowerCase())
      );
    }
    if (statusFilter !== "all") {
      filteredCases = filteredCases.filter((itr) =>
        Array.from(statusFilter).includes(itr.state)
      );
    }

    return filteredCases;
  }, [cases, filterValue, statusFilter]);

  const sortedItems = useMemo(() => {
    return [...filteredItems].sort((a: Case, b: Case) => {
      const first = a[sortDescriptor.column as keyof Case] as number;
      const second = b[sortDescriptor.column as keyof Case] as number;
      const cmp = first < second ? -1 : first > second ? 1 : 0;

      return sortDescriptor.direction === "descending" ? -cmp : cmp;
    });
  }, [sortDescriptor, filteredItems]);

  const renderCell = useCallback((testCase: Case, columnKey: Key) => {
    const cellValue = testCase[columnKey as keyof Case];

    switch (columnKey) {
      case "id":
        return <span>{cellValue}</span>;
      case "title":
        return <span>{cellValue}</span>;
      case "actions":
        return (
          <div className="relative flex justify-end items-center gap-2">
            <Dropdown className="bg-background border-1 border-default-200">
              <DropdownTrigger>
                <Button isIconOnly radius="full" size="sm" variant="light">
                  <MoreVertical className="text-default-400" />
                </Button>
              </DropdownTrigger>
              <DropdownMenu>
                <DropdownItem>View</DropdownItem>
                <DropdownItem>Edit</DropdownItem>
                <DropdownItem>Delete</DropdownItem>
              </DropdownMenu>
            </Dropdown>
          </div>
        );
      default:
        return cellValue;
    }
  }, []);

  const topContent = useMemo(() => {
    return (
      <div className="flex flex-col gap-4 p-5">
        <div className="flex justify-between gap-3 items-end">
          <div className="flex gap-3">
            <Dropdown>
              <DropdownTrigger className="hidden sm:flex">
                <Button
                  endContent={<ChevronDown className="text-small" />}
                  size="sm"
                  variant="flat"
                >
                  Columns
                </Button>
              </DropdownTrigger>
              <DropdownMenu
                disallowEmptySelection
                aria-label="Table Columns"
                closeOnSelect={false}
                selectedKeys={visibleColumns}
                selectionMode="multiple"
                onSelectionChange={setVisibleColumns}
              >
                {columns.map((column) => (
                  <DropdownItem key={column.uid} className="capitalize">
                    {capitalize(column.name)}
                  </DropdownItem>
                ))}
              </DropdownMenu>
            </Dropdown>
            <Button
              className="bg-foreground text-background"
              endContent={<Plus />}
              size="sm"
            >
              Add New
            </Button>
          </div>
        </div>
      </div>
    );
  }, [
    filterValue,
    statusFilter,
    visibleColumns,
    cases.length,
    hasSearchFilter,
  ]);

  const classNames = useMemo(
    () => ({
      wrapper: ["max-w-3xl"],
      table: ["border-t-1"],
      th: ["bg-transparent", "text-default-500", "border-b", "border-divider"],
      td: [
        // changing the rows border radius
        // first
        "group-data-[first=true]:first:before:rounded-none",
        "group-data-[first=true]:last:before:rounded-none",
        // middle
        "group-data-[middle=true]:before:rounded-none",
        // last
        "group-data-[last=true]:first:before:rounded-none",
        "group-data-[last=true]:last:before:rounded-none",
      ],
    }),
    []
  );

  return (
    <Table
      isCompact
      removeWrapper
      aria-label="Tese cases table"
      checkboxesProps={{
        classNames: {
          wrapper: "after:bg-foreground after:text-background text-background",
        },
      }}
      classNames={classNames}
      selectedKeys={selectedKeys}
      selectionMode="multiple"
      sortDescriptor={sortDescriptor}
      topContent={topContent}
      topContentPlacement="outside"
      onSelectionChange={setSelectedKeys}
      onSortChange={setSortDescriptor}
    >
      <TableHeader columns={headerColumns}>
        {(column) => (
          <TableColumn
            key={column.uid}
            align={column.uid === "actions" ? "center" : "start"}
            allowsSorting={column.sortable}
          >
            {column.name}
          </TableColumn>
        )}
      </TableHeader>
      <TableBody emptyContent={"No cases found"} items={sortedItems}>
        {(item) => (
          <TableRow key={item.id}>
            {(columnKey) => (
              <TableCell>{renderCell(item, columnKey)}</TableCell>
            )}
          </TableRow>
        )}
      </TableBody>
    </Table>
  );
}