"use client";

import * as React from "react";
import {
  IconChevronDown,
  IconChevronLeft,
  IconChevronRight,
  IconChevronsLeft,
  IconChevronsRight,
  IconDotsVertical,
  IconLayoutColumns,
  IconSearch,
  IconMail,
  IconPhone,
} from "@tabler/icons-react";
import {
  ColumnDef,
  ColumnFiltersState,
  flexRender,
  getCoreRowModel,
  getFacetedRowModel,
  getFacetedUniqueValues,
  getFilteredRowModel,
  getPaginationRowModel,
  getSortedRowModel,
  SortingState,
  useReactTable,
  VisibilityState,
} from "@tanstack/react-table";

import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import {
  DropdownMenu,
  DropdownMenuCheckboxItem,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";


type Patient = {
  id: string;
  name: string;
  email: string;
  phone: string | null;
  dateOfBirth: Date | null;
  medicalHistory: string | null;
  createdAt: Date;
  appointmentsAsPatient: Array<{
    id: string;
    status: string;
  }>;
  payments: Array<{
    id: string;
    amount: number;
  }>;
};

const columns: ColumnDef<Patient>[] = [
  {
    id: "select",
    header: ({ table }) => (
      <div className="flex items-center justify-center">
        <Checkbox
          checked={
            table.getIsAllPageRowsSelected() ||
            (table.getIsSomePageRowsSelected() && "indeterminate")
          }
          onCheckedChange={(value) => table.toggleAllPageRowsSelected(!!value)}
          aria-label="Select all"
        />
      </div>
    ),
    cell: ({ row }) => (
      <div className="flex items-center justify-center">
        <Checkbox
          checked={row.getIsSelected()}
          onCheckedChange={(value) => row.toggleSelected(!!value)}
          aria-label="Select row"
        />
      </div>
    ),
    enableSorting: false,
    enableHiding: false,
  },
  {
    accessorKey: "name",
    header: "Name",
    cell: ({ row }) => <span className="font-medium">{row.original.name}</span>,
    enableHiding: false,
  },
  {
    accessorKey: "contact",
    header: "Contact",
    cell: ({ row }) => (
      <div className="space-y-1">
        <div className="flex items-center gap-1 text-sm">
          <IconMail className="size-3" />
          <span className="text-xs">{row.original.email}</span>
        </div>
        {row.original.phone && (
          <div className="flex items-center gap-1 text-sm">
            <IconPhone className="size-3" />
            <span className="text-xs">{row.original.phone}</span>
          </div>
        )}
      </div>
    ),
  },
  {
    accessorKey: "dateOfBirth",
    header: "Date of Birth",
    cell: ({ row }) =>
      row.original.dateOfBirth
        ? new Date(row.original.dateOfBirth).toLocaleDateString()
        : "-",
  },
  {
    accessorKey: "appointments",
    header: "Appointments",
    cell: ({ row }) => row.original.appointmentsAsPatient.length,
  },
  {
    accessorKey: "totalSpent",
    header: () => <div className="text-right">Total Spent</div>,
    cell: ({ row }) => {
      const totalSpent = row.original.payments.reduce(
        (sum, payment) => sum + payment.amount,
        0
      );
      return <div className="text-right">₱{totalSpent.toFixed(2)}</div>;
    },
  },
  {
    accessorKey: "createdAt",
    header: "Joined",
    cell: ({ row }) => new Date(row.original.createdAt).toLocaleDateString(),
  },
  {
    id: "actions",
    cell: () => (
      <DropdownMenu>
        <DropdownMenuTrigger asChild>
          <Button
            variant="ghost"
            className="data-[state=open]:bg-muted text-muted-foreground flex size-8"
            size="icon"
          >
            <IconDotsVertical />
            <span className="sr-only">Open menu</span>
          </Button>
        </DropdownMenuTrigger>
        <DropdownMenuContent align="end" className="w-40">
          <DropdownMenuItem>View Details</DropdownMenuItem>
          <DropdownMenuItem>Edit Profile</DropdownMenuItem>
          <DropdownMenuItem>View History</DropdownMenuItem>
          <DropdownMenuSeparator />
          <DropdownMenuItem variant="destructive">Delete</DropdownMenuItem>
        </DropdownMenuContent>
      </DropdownMenu>
    ),
  },
];

type AdminPatientsTableProps = {
  patients: Patient[];
};

export function AdminPatientsTable({ patients }: AdminPatientsTableProps) {
  const [rowSelection, setRowSelection] = React.useState({});
  const [columnVisibility, setColumnVisibility] =
    React.useState<VisibilityState>({});
  const [columnFilters, setColumnFilters] = React.useState<ColumnFiltersState>(
    []
  );
  const [sorting, setSorting] = React.useState<SortingState>([]);
  const [pagination, setPagination] = React.useState({
    pageIndex: 0,
    pageSize: 10,
  });

  const table = useReactTable({
    data: patients,
    columns,
    state: {
      sorting,
      columnVisibility,
      rowSelection,
      columnFilters,
      pagination,
    },
    enableRowSelection: true,
    onRowSelectionChange: setRowSelection,
    onSortingChange: setSorting,
    onColumnFiltersChange: setColumnFilters,
    onColumnVisibilityChange: setColumnVisibility,
    onPaginationChange: setPagination,
    getCoreRowModel: getCoreRowModel(),
    getFilteredRowModel: getFilteredRowModel(),
    getPaginationRowModel: getPaginationRowModel(),
    getSortedRowModel: getSortedRowModel(),
    getFacetedRowModel: getFacetedRowModel(),
    getFacetedUniqueValues: getFacetedUniqueValues(),
  });

  return (
    <div className="flex flex-col gap-4">
      <div className="flex items-center justify-between">
        <div className="relative w-full max-w-sm">
          <IconSearch className="absolute left-2 top-2.5 size-4 text-muted-foreground" />
          <Input
            placeholder="Search patients..."
            value={(table.getColumn("name")?.getFilterValue() as string) ?? ""}
            onChange={(event) =>
              table.getColumn("name")?.setFilterValue(event.target.value)
            }
            className="pl-8"
          />
        </div>
        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button variant="outline" size="sm">
              <IconLayoutColumns />
              <span className="hidden lg:inline">Columns</span>
              <IconChevronDown />
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent align="end" className="w-56">
            {table
              .getAllColumns()
              .filter(
                (column) =>
                  typeof column.accessorFn !== "undefined" &&
                  column.getCanHide()
              )
              .map((column) => {
                return (
                  <DropdownMenuCheckboxItem
                    key={column.id}
                    className="capitalize"
                    checked={column.getIsVisible()}
                    onCheckedChange={(value) =>
                      column.toggleVisibility(!!value)
                    }
                  >
                    {column.id}
                  </DropdownMenuCheckboxItem>
                );
              })}
          </DropdownMenuContent>
        </DropdownMenu>
      </div>

      {/* Bulk Actions Toolbar */}
      {table.getFilteredSelectedRowModel().rows.length > 0 && (
        <div className="flex items-center gap-2 rounded-lg border bg-muted/50 p-2">
          <span className="text-sm font-medium">
            {table.getFilteredSelectedRowModel().rows.length} selected
          </span>
          <div className="ml-auto flex items-center gap-2">
            <Button variant="outline" size="sm">
              Send Email
            </Button>
            <Button variant="outline" size="sm">
              Send SMS
            </Button>
            <DropdownMenu>
              <DropdownMenuTrigger asChild>
                <Button variant="outline" size="sm">
                  More Actions
                  <IconChevronDown />
                </Button>
              </DropdownMenuTrigger>
              <DropdownMenuContent align="end">
                <DropdownMenuItem>Export Selected</DropdownMenuItem>
                <DropdownMenuItem>Add to Group</DropdownMenuItem>
                <DropdownMenuItem>Send Appointment Reminder</DropdownMenuItem>
                <DropdownMenuSeparator />
                <DropdownMenuItem variant="destructive">
                  Delete Selected
                </DropdownMenuItem>
              </DropdownMenuContent>
            </DropdownMenu>
          </div>
        </div>
      )}

      <div className="overflow-hidden rounded-lg border">
        <Table>
          <TableHeader className="bg-muted">
            {table.getHeaderGroups().map((headerGroup) => (
              <TableRow key={headerGroup.id}>
                {headerGroup.headers.map((header) => {
                  return (
                    <TableHead key={header.id} colSpan={header.colSpan}>
                      {header.isPlaceholder
                        ? null
                        : flexRender(
                            header.column.columnDef.header,
                            header.getContext()
                          )}
                    </TableHead>
                  );
                })}
              </TableRow>
            ))}
          </TableHeader>
          <TableBody>
            {table.getRowModel().rows?.length ? (
              table.getRowModel().rows.map((row) => (
                <TableRow
                  key={row.id}
                  data-state={row.getIsSelected() && "selected"}
                >
                  {row.getVisibleCells().map((cell) => (
                    <TableCell key={cell.id}>
                      {flexRender(
                        cell.column.columnDef.cell,
                        cell.getContext()
                      )}
                    </TableCell>
                  ))}
                </TableRow>
              ))
            ) : (
              <TableRow>
                <TableCell
                  colSpan={columns.length}
                  className="h-24 text-center"
                >
                  No patients found.
                </TableCell>
              </TableRow>
            )}
          </TableBody>
        </Table>
      </div>

      <div className="flex items-center justify-between">
        <div className="text-muted-foreground hidden flex-1 text-sm lg:flex">
          {table.getFilteredSelectedRowModel().rows.length} of{" "}
          {table.getFilteredRowModel().rows.length} row(s) selected.
        </div>
        <div className="flex w-full items-center gap-8 lg:w-fit">
          <div className="hidden items-center gap-2 lg:flex">
            <Label htmlFor="rows-per-page" className="text-sm font-medium">
              Rows per page
            </Label>
            <Select
              value={`${table.getState().pagination.pageSize}`}
              onValueChange={(value) => {
                table.setPageSize(Number(value));
              }}
            >
              <SelectTrigger size="sm" className="w-20" id="rows-per-page">
                <SelectValue
                  placeholder={table.getState().pagination.pageSize}
                />
              </SelectTrigger>
              <SelectContent side="top">
                {[10, 20, 30, 40, 50].map((pageSize) => (
                  <SelectItem key={pageSize} value={`${pageSize}`}>
                    {pageSize}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          </div>
          <div className="flex w-fit items-center justify-center text-sm font-medium">
            Page {table.getState().pagination.pageIndex + 1} of{" "}
            {table.getPageCount()}
          </div>
          <div className="ml-auto flex items-center gap-2 lg:ml-0">
            <Button
              variant="outline"
              className="hidden h-8 w-8 p-0 lg:flex"
              onClick={() => table.setPageIndex(0)}
              disabled={!table.getCanPreviousPage()}
            >
              <span className="sr-only">Go to first page</span>
              <IconChevronsLeft />
            </Button>
            <Button
              variant="outline"
              className="size-8"
              size="icon"
              onClick={() => table.previousPage()}
              disabled={!table.getCanPreviousPage()}
            >
              <span className="sr-only">Go to previous page</span>
              <IconChevronLeft />
            </Button>
            <Button
              variant="outline"
              className="size-8"
              size="icon"
              onClick={() => table.nextPage()}
              disabled={!table.getCanNextPage()}
            >
              <span className="sr-only">Go to next page</span>
              <IconChevronRight />
            </Button>
            <Button
              variant="outline"
              className="hidden size-8 lg:flex"
              size="icon"
              onClick={() => table.setPageIndex(table.getPageCount() - 1)}
              disabled={!table.getCanNextPage()}
            >
              <span className="sr-only">Go to last page</span>
              <IconChevronsRight />
            </Button>
          </div>
        </div>
      </div>
    </div>
  );
}