"use client";

import { useState } from "react";
import useSWR from "swr";
import {
  ColumnDef,
  flexRender,
  getCoreRowModel,
  getPaginationRowModel,
  getSortedRowModel,
  SortingState,
  useReactTable,
} from "@tanstack/react-table";
import { toast } from "sonner";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from "@/components/ui/dialog";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from "@/components/ui/alert-dialog";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import AdminNewsService from "@/services/admin.news.service";
import NewsService from "@/services/news.service";
import type { Category } from "@/types/news.type";
import {
  Plus,
  Search,
  MoreHorizontal,
  Edit,
  Trash,
  ChevronLeft,
  ChevronRight,
  Folder,
  Loader2,
} from "lucide-react";

interface CategoryFormData {
  name: string;
}

const CategoriesPage = () => {
  const [sorting, setSorting] = useState<SortingState>([]);
  const [globalFilter, setGlobalFilter] = useState("");
  const [isDialogOpen, setIsDialogOpen] = useState(false);
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [editingCategory, setEditingCategory] = useState<Category | null>(null);
  const [deleteDialogOpen, setDeleteDialogOpen] = useState(false);
  const [categoryToDelete, setCategoryToDelete] = useState<Category | null>(null);
  const [formData, setFormData] = useState<CategoryFormData>({
    name: "",
  });

  const { data: categories = [], isLoading, mutate } = useSWR<Category[]>(
    "/admin/news/categories",
    () => NewsService.getCategories()
  );

  const resetForm = () => {
    setFormData({ name: "" });
    setEditingCategory(null);
  };

  const openCreateDialog = () => {
    resetForm();
    setIsDialogOpen(true);
  };

  const openEditDialog = (category: Category) => {
    setEditingCategory(category);
    setFormData({
      name: category.name,
    });
    setIsDialogOpen(true);
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setIsSubmitting(true);

    try {
      if (editingCategory) {
        await AdminNewsService.updateCategory(editingCategory.id, {
          name: formData.name,
        });
        toast.success("Kategori berhasil diperbarui");
      } else {
        await AdminNewsService.createCategory({
          name: formData.name,
        });
        toast.success("Kategori berhasil ditambahkan");
      }
      mutate();
      setIsDialogOpen(false);
      resetForm();
    } catch (error) {
      toast.error(editingCategory ? "Gagal memperbarui kategori" : "Gagal menambahkan kategori");
    } finally {
      setIsSubmitting(false);
    }
  };

  const handleDelete = async () => {
    if (!categoryToDelete) return;

    try {
      await AdminNewsService.deleteCategory(categoryToDelete.id);
      toast.success("Kategori berhasil dihapus");
      mutate();
    } catch (error) {
      toast.error("Gagal menghapus kategori");
    } finally {
      setDeleteDialogOpen(false);
      setCategoryToDelete(null);
    }
  };

  const columns: ColumnDef<Category>[] = [
    {
      accessorKey: "name",
      header: "Nama Kategori",
      cell: ({ row }) => (
        <div className="flex items-center gap-3">
          <div className="h-10 w-10 rounded-full bg-slate-100 flex items-center justify-center">
            <Folder className="h-5 w-5 text-slate-500" />
          </div>
          <div>
            <p className="font-medium">{row.original.name}</p>
            <p className="text-sm text-slate-500">/{row.original.slug}</p>
          </div>
        </div>
      ),
    },
    {
      accessorKey: "slug",
      header: "Slug",
      cell: ({ row }) => (
        <code className="px-2 py-1 bg-slate-100 rounded text-sm">
          {row.original.slug}
        </code>
      ),
    },
    {
      id: "actions",
      header: "Aksi",
      cell: ({ row }) => (
        <DropdownMenu>
          <DropdownMenuTrigger>
            <Button variant="ghost" size="icon">
              <MoreHorizontal className="h-4 w-4" />
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent align="end">
            <DropdownMenuItem onClick={() => openEditDialog(row.original)}>
              <Edit className="h-4 w-4 mr-2" />
              Edit
            </DropdownMenuItem>
            <DropdownMenuItem
              className="text-red-600"
              onClick={() => {
                setCategoryToDelete(row.original);
                setDeleteDialogOpen(true);
              }}
            >
              <Trash className="h-4 w-4 mr-2" />
              Hapus
            </DropdownMenuItem>
          </DropdownMenuContent>
        </DropdownMenu>
      ),
    },
  ];

  const table = useReactTable({
    data: categories,
    columns,
    getCoreRowModel: getCoreRowModel(),
    getPaginationRowModel: getPaginationRowModel(),
    getSortedRowModel: getSortedRowModel(),
    onSortingChange: setSorting,
    state: {
      sorting,
      globalFilter,
    },
    globalFilterFn: (row, columnId, filterValue) => {
      const value = row.getValue(columnId);
      return String(value).toLowerCase().includes(filterValue.toLowerCase());
    },
  });

  return (
    <div className="space-y-4">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-slate-900">Kelola Kategori</h1>
          <p className="text-slate-500">Kelola kategori berita</p>
        </div>
        <Button onClick={openCreateDialog}>
          <Plus className="h-4 w-4 mr-2" />
          Tambah Kategori
        </Button>
      </div>

      {/* Search */}
      <div className="flex items-center gap-2">
        <div className="relative flex-1 max-w-sm">
          <Search className="absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-slate-500" />
          <Input
            placeholder="Cari kategori..."
            value={globalFilter}
            onChange={(e) => setGlobalFilter(e.target.value)}
            className="pl-9"
          />
        </div>
      </div>

      {/* Table */}
      <div className="rounded-md border">
        <Table>
          <TableHeader>
            {table.getHeaderGroups().map((headerGroup) => (
              <TableRow key={headerGroup.id}>
                {headerGroup.headers.map((header) => (
                  <TableHead key={header.id}>
                    {header.isPlaceholder
                      ? null
                      : flexRender(header.column.columnDef.header, header.getContext())}
                  </TableHead>
                ))}
              </TableRow>
            ))}
          </TableHeader>
          <TableBody>
            {isLoading ? (
              <TableRow>
                <TableCell colSpan={columns.length} className="h-24 text-center">
                  Memuat data...
                </TableCell>
              </TableRow>
            ) : 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">
                  Tidak ada data kategori.
                </TableCell>
              </TableRow>
            )}
          </TableBody>
        </Table>
      </div>

      {/* Pagination */}
      <div className="flex items-center justify-between">
        <p className="text-sm text-slate-500">
          Menampilkan {table.getState().pagination.pageIndex + 1} dari {table.getPageCount()} halaman
        </p>
        <div className="flex items-center gap-2">
          <Button
            variant="outline"
            size="sm"
            onClick={() => table.previousPage()}
            disabled={!table.getCanPreviousPage()}
          >
            <ChevronLeft className="h-4 w-4" />
          </Button>
          <Button
            variant="outline"
            size="sm"
            onClick={() => table.nextPage()}
            disabled={!table.getCanNextPage()}
          >
            <ChevronRight className="h-4 w-4" />
          </Button>
        </div>
      </div>

      {/* Create/Edit Dialog */}
      <Dialog open={isDialogOpen} onOpenChange={setIsDialogOpen}>
        <DialogContent className="sm:max-w-[500px]">
          <DialogHeader>
            <DialogTitle>
              {editingCategory ? "Edit Kategori" : "Tambah Kategori"}
            </DialogTitle>
          </DialogHeader>
          <form onSubmit={handleSubmit} className="space-y-4">
            <div className="space-y-2">
              <Label htmlFor="name">Nama Kategori *</Label>
              <Input
                id="name"
                value={formData.name}
                onChange={(e) => setFormData({ name: e.target.value })}
                placeholder="Contoh: Kesehatan"
                required
              />
            </div>
            <DialogFooter>
              <Button type="button" variant="outline" onClick={() => setIsDialogOpen(false)}>
                Batal
              </Button>
              <Button type="submit" disabled={isSubmitting}>
                {isSubmitting && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
                {editingCategory ? "Simpan Perubahan" : "Tambah Kategori"}
              </Button>
            </DialogFooter>
          </form>
        </DialogContent>
      </Dialog>

      {/* Delete Confirmation Dialog */}
      <AlertDialog open={deleteDialogOpen} onOpenChange={setDeleteDialogOpen}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>Hapus Kategori</AlertDialogTitle>
            <AlertDialogDescription>
              Apakah Anda yakin ingin menghapus kategori "{categoryToDelete?.name}"? 
              Tindakan ini tidak dapat dibatalkan.
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>Batal</AlertDialogCancel>
            <AlertDialogAction onClick={handleDelete} className="bg-red-600 hover:bg-red-700">
              Hapus
            </AlertDialogAction>
          </AlertDialogFooter>
n        </AlertDialogContent>
      </AlertDialog>
    </div>
  );
};

export default CategoriesPage;