"use client";

import { useCallback, useEffect, useState, useTransition } from "react";
import { usePathname } from "next/navigation";
import {
  Sidebar,
  SidebarContent,
  SidebarFooter,
  SidebarGroup,
  SidebarGroupContent,
  SidebarGroupLabel,
  SidebarHeader,
  SidebarMenu,
  SidebarMenuAction,
  SidebarMenuBadge,
  SidebarMenuButton,
  SidebarMenuItem,
  SidebarMenuSub,
  SidebarMenuSubButton,
  SidebarMenuSubItem,
  SidebarInput,
} from "@/components/ui/sidebar";
import { ScrollArea } from "@/components/ui/scroll-area";
import {
  ArrowLeft,
  ClipboardList,
  ChevronRight,
  Eye,
  FilePenLine,
  LayoutDashboard,
  Settings,
  Search,
} from "lucide-react";
import { ThemeToggle } from "@/components/theme-toggle";
import {
  DropdownMenuAvatar,
  type DiscordMemberProfile,
} from "@/components/dropdown-menu-avatar";
import { GuardedLink } from "@/components/guarded-link";
import { Badge } from "@/components/ui/badge";
import { cn } from "@/lib/utils";
import { Button } from "@/components/ui/button";
import { getResponseNavigation } from "@/app/admin/form/actions";

type ResponseNavigationData = Awaited<ReturnType<typeof getResponseNavigation>>;

export function FormAdminSidebar({
  formId,
  formTitle,
  isOpen,
  userName,
  userImage,
  profile,
  responseCount,
}: {
  formId: string;
  formTitle: string;
  isOpen: boolean;
  userName?: string;
  userImage?: string;
  profile?: DiscordMemberProfile | null;
  responseCount: number;
}) {
  const pathname = usePathname();
  const [responsesOpen, setResponsesOpen] = useState(
    pathname.startsWith(`/admin/form/${formId}/result/`),
  );
  const [responseQuery, setResponseQuery] = useState("");
  const [responseData, setResponseData] =
    useState<ResponseNavigationData | null>(null);
  const [responseError, setResponseError] = useState<string | null>(null);
  const [isLoadingResponses, startResponseTransition] = useTransition();

  const loadResponses = useCallback((page: number, query = responseQuery) => {
    startResponseTransition(async () => {
      try {
        setResponseError(null);
        setResponseData(await getResponseNavigation(formId, page, query));
      } catch {
        setResponseError("Could not load responses.");
      }
    });
  }, [formId, responseQuery]);

  useEffect(() => {
    if (responsesOpen && responseCount > 0 && !responseData) {
      loadResponses(1, "");
    }
  }, [loadResponses, responsesOpen, responseCount, responseData]);
  const currentSection = pathname.startsWith(`/admin/form/${formId}/result`)
    ? "Responses"
    : pathname.startsWith(`/admin/form/${formId}/extra`)
      ? "Settings"
      : pathname.startsWith(`/admin/form/${formId}/preview`)
        ? "Preview"
        : "Editor";

  const items = [
    {
      href: `/admin/form/${formId}`,
      label: "Editor",
      icon: LayoutDashboard,
      active: pathname === `/admin/form/${formId}`,
    },
    {
      href: `/admin/form/${formId}/result`,
      label: "Responses",
      icon: ClipboardList,
      active: pathname.startsWith(`/admin/form/${formId}/result`),
    },
    {
      href: `/admin/form/${formId}/extra`,
      label: "Settings",
      icon: Settings,
      active: pathname.startsWith(`/admin/form/${formId}/extra`),
    },
    {
      href: `/admin/form/${formId}/preview`,
      label: "Preview",
      icon: Eye,
      active: pathname.startsWith(`/admin/form/${formId}/preview`),
    },
  ];

  return (
    <Sidebar variant="sidebar" collapsible="icon">
      <SidebarHeader className="border-b p-2">
        <SidebarMenu>
          <SidebarMenuItem>
            <SidebarMenuButton
              asChild
              size="lg"
              tooltip={`${formTitle} · ${isOpen ? "Open" : "Closed"}`}
              className="h-auto min-h-14"
            >
              <GuardedLink
                href={`/admin/form/${formId}`}
                aria-label={`${formTitle}, ${isOpen ? "open" : "closed"}. Open editor`}
              >
                <FilePenLine />
                <div className="min-w-0 flex-1">
                  <div className="flex min-w-0 items-center gap-2">
                    <span className="min-w-0 flex-1 truncate font-medium">
                      {formTitle}
                    </span>
                    <Badge
                      variant={isOpen ? "default" : "secondary"}
                      className="shrink-0"
                    >
                      {isOpen ? "Open" : "Closed"}
                    </Badge>
                  </div>
                  <span className="mt-1 block text-xs text-muted-foreground">
                    {currentSection}
                  </span>
                </div>
              </GuardedLink>
            </SidebarMenuButton>
          </SidebarMenuItem>
          <SidebarMenuItem>
            <SidebarMenuButton asChild>
              <GuardedLink href="/admin/form">
                <ArrowLeft />
                <span>All forms</span>
              </GuardedLink>
            </SidebarMenuButton>
          </SidebarMenuItem>
        </SidebarMenu>
      </SidebarHeader>
      <SidebarContent>
        <SidebarGroup>
          <SidebarGroupLabel>Workspace</SidebarGroupLabel>
          <SidebarGroupContent>
            <SidebarMenu>
              {items.map(({ href, label, icon: Icon, active }) => (
                <SidebarMenuItem key={href}>
                  <SidebarMenuButton asChild isActive={active}>
                    <GuardedLink href={href}>
                      <Icon />
                      <span>{label}</span>
                    </GuardedLink>
                  </SidebarMenuButton>
                  {label === "Responses" && responseCount > 0 && (
                    <SidebarMenuBadge>{responseCount}</SidebarMenuBadge>
                  )}
                  {label === "Responses" && responseCount > 0 && (
                    <SidebarMenuAction
                      className="right-8"
                      onClick={() => setResponsesOpen((open) => !open)}
                      aria-label={`${responsesOpen ? "Collapse" : "Expand"} responses`}
                      aria-expanded={responsesOpen}
                    >
                      <ChevronRight
                        className={cn(
                          "transition-transform",
                          responsesOpen && "rotate-90"
                        )}
                      />
                    </SidebarMenuAction>
                  )}
                  {label === "Responses" &&
                    responsesOpen &&
                    responseCount > 0 && (
                      <div className="mt-1 flex flex-col gap-2 group-data-[collapsible=icon]:hidden">
                        <form
                          className="flex items-center gap-1 px-2"
                          onSubmit={(event) => {
                            event.preventDefault();
                            loadResponses(1);
                          }}
                        >
                          <SidebarInput
                            value={responseQuery}
                            onChange={(event) => setResponseQuery(event.target.value)}
                            placeholder="Search responses"
                            aria-label="Search response navigation"
                          />
                          <Button
                            type="submit"
                            size="icon-sm"
                            variant="ghost"
                            disabled={isLoadingResponses}
                            aria-label="Search responses"
                          >
                            <Search />
                          </Button>
                        </form>
                        <ScrollArea className="max-h-[min(50vh,28rem)]">
                          <SidebarMenuSub>
                          {responseData?.items.map((response) => {
                            const responseHref = `/admin/form/${formId}/result/${response.id}`;

                            return (
                              <SidebarMenuSubItem key={response.id}>
                                <SidebarMenuSubButton
                                  asChild
                                  isActive={pathname === responseHref}
                                >
                                  <GuardedLink href={responseHref}>
                                    <span className="min-w-0 truncate">
                                      {response.queueNumber}. {response.displayName}
                                    </span>
                                  </GuardedLink>
                                </SidebarMenuSubButton>
                              </SidebarMenuSubItem>
                            );
                          })}
                          {isLoadingResponses && !responseData && (
                            <SidebarMenuSubItem className="px-2 py-1 text-xs text-muted-foreground">
                              Loading responses…
                            </SidebarMenuSubItem>
                          )}
                          {responseError && (
                            <SidebarMenuSubItem className="px-2 py-1 text-xs text-destructive">
                              {responseError}
                            </SidebarMenuSubItem>
                          )}
                          </SidebarMenuSub>
                        </ScrollArea>
                        {responseData && responseData.pageCount > 1 && (
                          <div className="flex items-center justify-between gap-1 px-2">
                            <Button
                              size="sm"
                              variant="ghost"
                              disabled={isLoadingResponses || responseData.page === 1}
                              onClick={() => loadResponses(responseData.page - 1)}
                            >
                              Previous
                            </Button>
                            <span className="text-xs text-muted-foreground">
                              {responseData.page} / {responseData.pageCount}
                            </span>
                            <Button
                              size="sm"
                              variant="ghost"
                              disabled={isLoadingResponses || responseData.page === responseData.pageCount}
                              onClick={() => loadResponses(responseData.page + 1)}
                            >
                              Next
                            </Button>
                          </div>
                        )}
                      </div>
                    )}
                </SidebarMenuItem>
              ))}
            </SidebarMenu>
          </SidebarGroupContent>
        </SidebarGroup>
      </SidebarContent>
      <SidebarFooter className="border-t p-4">
        <div className="flex items-center gap-1">
          {(userName || profile) && (
            <DropdownMenuAvatar
              userName={userName || ""}
              userImage={userImage || ""}
              profile={profile || null}
              showName
            />
          )}
          <div className="ml-auto">
            <ThemeToggle />
          </div>
        </div>
      </SidebarFooter>
    </Sidebar>
  );
}