import { useEffect, useState } from "react";
import {
  useListTrashedTools,
  useRestoreTools,
  useDeleteTrashedTools,
  useEmptyTrash,
  getListTrashedToolsQueryKey,
  getListToolsQueryKey,
  getListCategoriesQueryKey,
  getListAllFeaturesQueryKey,
  getListAllTagsQueryKey,
  getGetTopToolsQueryKey,
  getGetAnalyticsSummaryQueryKey,
} from "@workspace/api-client-react";
import { useQueryClient } from "@tanstack/react-query";
import { useAuth } from "@/hooks/use-auth";
import { Layout } from "@/components/layout";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import { Card, CardContent, CardHeader, CardTitle, CardDescription } from "@/components/ui/card";
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table";
import { Checkbox } from "@/components/ui/checkbox";
import { Skeleton } from "@/components/ui/skeleton";
import { useToast } from "@/hooks/use-toast";
import { AlertDialog, AlertDialogAction, AlertDialogCancel, AlertDialogContent, AlertDialogDescription, AlertDialogFooter, AlertDialogHeader, AlertDialogTitle } from "@/components/ui/alert-dialog";
import { Trash2, RotateCcw, Search, ShieldAlert, Trash as TrashIcon, RefreshCcw } from "lucide-react";
import { format } from "date-fns";
import { useTranslation } from "react-i18next";

export default function Trash() {
  const { t } = useTranslation();
  const { user, isAdmin, hasFeature, isLoading: authLoading } = useAuth();
  const { toast } = useToast();
  const queryClient = useQueryClient();

  const [searchInput, setSearchInput] = useState("");
  const [search, setSearch] = useState("");
  const [selected, setSelected] = useState<Set<number>>(new Set());
  const [confirmDelete, setConfirmDelete] = useState(false);
  const [confirmEmpty, setConfirmEmpty] = useState(false);

  useEffect(() => {
    const t = setTimeout(() => setSearch(searchInput), 300);
    return () => clearTimeout(t);
  }, [searchInput]);

  const hasTrash = hasFeature("trash");

  const { data: tools, isLoading: loading } = useListTrashedTools(
    search ? { search } : undefined,
    { query: { queryKey: getListTrashedToolsQueryKey(search ? { search } : undefined), enabled: hasTrash } },
  );

  const restore = useRestoreTools();
  const deletePermanent = useDeleteTrashedTools();
  const empty = useEmptyTrash();

  const trashed = tools ?? [];

  function invalidate() {
    queryClient.invalidateQueries({ queryKey: getListTrashedToolsQueryKey() });
    queryClient.invalidateQueries({ queryKey: getListToolsQueryKey() });
    queryClient.invalidateQueries({ queryKey: getListCategoriesQueryKey() });
    queryClient.invalidateQueries({ queryKey: getListAllFeaturesQueryKey() });
    queryClient.invalidateQueries({ queryKey: getListAllTagsQueryKey() });
    queryClient.invalidateQueries({ queryKey: getGetTopToolsQueryKey() });
    queryClient.invalidateQueries({ queryKey: getGetAnalyticsSummaryQueryKey() });
  }

  function toggle(id: number) {
    setSelected((prev) => {
      const next = new Set(prev);
      if (next.has(id)) next.delete(id);
      else next.add(id);
      return next;
    });
  }

  function toggleAll() {
    if (selected.size === trashed.length) {
      setSelected(new Set());
    } else {
      setSelected(new Set(trashed.map((t) => t.id)));
    }
  }

  function handleRestore(ids: number[]) {
    restore.mutate(
      { data: { ids } },
      {
        onSuccess: (res) => {
          toast({ title: t("trash.toastRestored"), description: t("trash.toastRestoredSub", { count: res.restored ?? ids.length }) });
          setSelected(new Set());
          invalidate();
        },
        onError: (err) => {
          toast({ title: t("trash.toastRestoreFailed"), description: err.data?.error ?? err.message, variant: "destructive" });
        },
      },
    );
  }

  function handleDeletePermanent(ids: number[]) {
    deletePermanent.mutate(
      { data: { ids } },
      {
        onSuccess: () => {
          toast({ title: t("trash.toastDeleted"), description: t("trash.toastDeletedSub", { count: ids.length }) });
          setSelected(new Set());
          setConfirmDelete(false);
          invalidate();
        },
        onError: (err) => {
          toast({ title: t("trash.toastDeleteFailed"), description: err.data?.error ?? err.message, variant: "destructive" });
        },
      },
    );
  }

  function handleEmpty() {
    empty.mutate(
      undefined,
      {
        onSuccess: (res) => {
          toast({ title: t("trash.toastEmptied"), description: t("trash.toastEmptiedSub", { count: res.deleted ?? 0 }) });
          setSelected(new Set());
          setConfirmEmpty(false);
          invalidate();
        },
        onError: (err) => {
          toast({ title: t("trash.toastEmptyFailed"), description: err.data?.error ?? err.message, variant: "destructive" });
        },
      },
    );
  }

  if (!authLoading && !hasTrash) {
    return (
      <Layout>
        <div className="flex flex-col items-center justify-center py-20 gap-4">
          <ShieldAlert className="w-12 h-12 text-muted-foreground" />
          <h2 className="text-2xl font-bold">{t("trash.requiresPremium")}</h2>
          <p className="text-muted-foreground">{t("trash.requiresPremiumSub")}</p>
          <Button variant="outline" asChild>
            <a href="/tools">{t("common.backToTools")}</a>
          </Button>
        </div>
      </Layout>
    );
  }

  const selectedIds = [...selected];

  return (
    <Layout>
      <div className="space-y-6 pb-10">
        <div>
          <h1 className="text-3xl font-bold tracking-tight mb-2">
            {t("trash.title")}
          </h1>
          <p className="text-muted-foreground">{t("trash.subtitle")}</p>
        </div>

        <Card>
          <CardHeader className="flex flex-row items-center justify-between gap-4 flex-wrap">
            <div className="space-y-1.5">
              <CardTitle>{t("trash.trashedTools")}</CardTitle>
              <CardDescription>
                {selectedIds.length > 0 ? t("trash.selected", { count: selectedIds.length }) : t("trash.toolsInTrash", { count: trashed.length })}
              </CardDescription>
            </div>
            <div className="flex items-center gap-2 flex-wrap">
              <div className="relative">
                <Search className="w-4 h-4 absolute left-2.5 top-1/2 -translate-y-1/2 text-muted-foreground" />
                <Input
                  className="pl-8 w-56"
                  placeholder={`${t("common.search")}…`}
                  value={searchInput}
                  onChange={(e) => setSearchInput(e.target.value)}
                />
              </div>
              <Button
                size="sm"
                variant="outline"
                disabled={selectedIds.length === 0 || restore.isPending}
                onClick={() => handleRestore(selectedIds)}
              >
                <RotateCcw className="w-4 h-4 mr-2" /> {t("trash.restore")} ({selectedIds.length})
              </Button>
              {isAdmin && (
                <>
                  <Button
                    size="sm"
                    variant="outline"
                    className="text-destructive hover:bg-destructive hover:text-destructive-foreground"
                    disabled={selectedIds.length === 0 || deletePermanent.isPending}
                    onClick={() => setConfirmDelete(true)}
                  >
                    <TrashIcon className="w-4 h-4 mr-2" /> {t("trash.deletePermanently")} ({selectedIds.length})
                  </Button>
                  <Button
                    size="sm"
                    variant="outline"
                    disabled={trashed.length === 0 || empty.isPending}
                    onClick={() => setConfirmEmpty(true)}
                  >
                    <Trash2 className="w-4 h-4 mr-2" /> {t("trash.emptyTrash")}
                  </Button>
                </>
              )}
            </div>
          </CardHeader>
          <CardContent>
            {loading ? (
              <div className="space-y-3">
                {[1, 2, 3].map((i) => <Skeleton key={i} className="h-12 w-full" />)}
              </div>
            ) : trashed.length === 0 ? (
              <div className="text-sm text-muted-foreground py-8 text-center flex flex-col items-center gap-2">
                <RefreshCcw className="w-6 h-6 text-muted-foreground/50" />
                {search ? t("trash.noMatch") : t("trash.empty")}
              </div>
            ) : (
              <Table>
                <TableHeader>
                  <TableRow>
                    <TableHead className="w-10">
                      <Checkbox
                        checked={selected.size === trashed.length && trashed.length > 0}
                        onCheckedChange={toggleAll}
                        aria-label={t("trash.selectAll")}
                      />
                    </TableHead>
                    <TableHead>{t("trash.name")}</TableHead>
                    <TableHead>{t("trash.category")}</TableHead>
                    <TableHead>{t("trash.deletedAt")}</TableHead>
                    <TableHead>{t("trash.deletedBy")}</TableHead>
                    <TableHead className="text-right">{t("trash.actions")}</TableHead>
                  </TableRow>
                </TableHeader>
                <TableBody>
                  {trashed.map((tool) => (
                    <TableRow key={tool.id} className={selected.has(tool.id) ? "bg-muted/40" : undefined}>
                      <TableCell>
                        <Checkbox
                          checked={selected.has(tool.id)}
                          onCheckedChange={() => toggle(tool.id)}
                          aria-label={t("trash.selectName", { name: tool.name })}
                        />
                      </TableCell>
                      <TableCell className="font-medium">{tool.name}</TableCell>
                      <TableCell>
                        <Badge variant="outline">{tool.category}</Badge>
                      </TableCell>
                      <TableCell className="text-sm text-muted-foreground">
                        {tool.deletedAt ? format(new Date(tool.deletedAt), "dd.MM.yyyy HH:mm") : "—"}
                      </TableCell>
                      <TableCell className="text-sm text-muted-foreground">{tool.deletedBy ?? "—"}</TableCell>
                      <TableCell className="text-right">
                        <div className="flex justify-end gap-1">
                          <Button variant="ghost" size="sm" onClick={() => handleRestore([tool.id])} disabled={restore.isPending}>
                            <RotateCcw className="w-3.5 h-3.5" /> {t("trash.restoreAction")}
                          </Button>
                          {isAdmin && (
                            <Button
                              variant="ghost"
                              size="sm"
                              className="text-destructive hover:text-destructive"
                              onClick={() => handleDeletePermanent([tool.id])}
                              disabled={deletePermanent.isPending}
                            >
                              <TrashIcon className="w-3.5 h-3.5" /> {t("trash.deleteAction")}
                            </Button>
                          )}
                        </div>
                      </TableCell>
                    </TableRow>
                  ))}
                </TableBody>
              </Table>
            )}
          </CardContent>
        </Card>
      </div>

      <AlertDialog open={confirmDelete} onOpenChange={setConfirmDelete}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>{t("trash.deleteConfirmTitle", { count: selectedIds.length })}</AlertDialogTitle>
            <AlertDialogDescription>
              {t("trash.deleteConfirmSub")}
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>{t("common.cancel")}</AlertDialogCancel>
            <AlertDialogAction
              className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
              onClick={() => handleDeletePermanent(selectedIds)}
            >
              {t("trash.deletePermanently")}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>

      <AlertDialog open={confirmEmpty} onOpenChange={setConfirmEmpty}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>{t("trash.emptyConfirmTitle")}</AlertDialogTitle>
            <AlertDialogDescription>
              {t("trash.emptyConfirmSub", { count: trashed.length })}
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>{t("common.cancel")}</AlertDialogCancel>
            <AlertDialogAction
              className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
              onClick={handleEmpty}
            >
              {t("trash.emptyTrash")}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </Layout>
  );
}