'use client';

import { useEffect, useMemo, useState } from 'react';
import { Check, FolderInput } from 'lucide-react';
import { toast } from 'sonner';

import { Button } from '@/components/ui/button';
import {
  Command,
  CommandEmpty,
  CommandGroup,
  CommandInput,
  CommandItem,
  CommandList,
} from '@/components/ui/command';
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from '@/components/ui/dialog';
import { toastError } from '@/lib/api/toast-error';
import {
  buildFolderPaths,
  useDocumentFolders,
  useMoveDocument,
} from '@/hooks/use-document-folders';

interface MoveToFolderDialogProps {
  documentId: string;
  documentTitle: string;
  currentFolderId: string | null;
  open: boolean;
  onOpenChange: (open: boolean) => void;
}

export function MoveToFolderDialog({
  documentId,
  documentTitle,
  currentFolderId,
  open,
  onOpenChange,
}: MoveToFolderDialogProps) {
  const { data: tree = [] } = useDocumentFolders();
  const move = useMoveDocument();
  const [pickedId, setPickedId] = useState<string | null>(currentFolderId);

  useEffect(() => {
    if (open) setPickedId(currentFolderId);
  }, [open, currentFolderId]);

  const paths = useMemo(() => buildFolderPaths(tree), [tree]);

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="sm:max-w-md">
        <DialogHeader>
          <DialogTitle>Move &ldquo;{documentTitle}&rdquo;</DialogTitle>
        </DialogHeader>
        <Command>
          <CommandInput placeholder="Search folders…" />
          <CommandList>
            <CommandEmpty>No folders match.</CommandEmpty>
            <CommandGroup heading="Special">
              <CommandItem
                value="Root (no folder)"
                onSelect={() => setPickedId(null)}
                className="flex items-center gap-2"
              >
                <Check
                  className={pickedId === null ? 'h-4 w-4 opacity-100' : 'h-4 w-4 opacity-0'}
                />
                Root (no folder)
              </CommandItem>
            </CommandGroup>
            {paths.length > 0 ? (
              <CommandGroup heading="Folders">
                {paths.map((p) => (
                  <CommandItem
                    key={p.id}
                    value={p.path}
                    onSelect={() => setPickedId(p.id)}
                    className="flex items-center gap-2"
                  >
                    <Check
                      className={pickedId === p.id ? 'h-4 w-4 opacity-100' : 'h-4 w-4 opacity-0'}
                    />
                    <span className="truncate">{p.path}</span>
                  </CommandItem>
                ))}
              </CommandGroup>
            ) : null}
          </CommandList>
        </Command>
        <DialogFooter>
          <Button variant="outline" onClick={() => onOpenChange(false)}>
            Cancel
          </Button>
          <Button
            disabled={pickedId === currentFolderId || move.isPending}
            onClick={async () => {
              try {
                await move.mutateAsync({ docId: documentId, folderId: pickedId });
                toast.success('Document moved');
                onOpenChange(false);
              } catch (err) {
                toastError(err);
              }
            }}
          >
            <FolderInput className="mr-1.5 h-4 w-4" />
            Move
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}