"use client";

import Link from "next/link";
import { toast } from "sonner";
import { useState, useTransition } from "react";
import { Bell, FileText, Megaphone } from "lucide-react";

import { markAnnouncementRead } from "@/actions/announcements";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { MarkdownContent } from "@/components/markdown-content";

export type NewsTickerItemDto = {
  id: string;
  title: string;
  content: string;
  excerpt: string;
  createdAt: string;
  authorName: string;
  isUnread: boolean;
  attachments: {
    id: string;
    fileName: string;
    fileUrl: string;
    fileType: string;
  }[];
};

export function NewsTicker({
  items,
  archive = false,
}: {
  items: NewsTickerItemDto[];
  archive?: boolean;
}) {
  const [selected, setSelected] = useState<NewsTickerItemDto | null>(null);
  const [readIds, setReadIds] = useState<Set<string>>(new Set());
  const [, startTransition] = useTransition();

  function openAnnouncement(item: NewsTickerItemDto) {
    setSelected(item);
    if (!item.isUnread || readIds.has(item.id)) return;

    startTransition(async () => {
      try {
        const result = await markAnnouncementRead(item.id);
        if (result.error) {
          toast.error(result.error);
          return;
        }
        setReadIds((current) => new Set(current).add(item.id));
      } catch {
        toast.error("Lesestatus konnte nicht gespeichert werden.");
      }
    });
  }

  return (
    <>
      <Card className="mb-8 border-[var(--good)] bg-[var(--good-soft)]">
        <CardHeader className="pb-3">
          <div className="flex flex-wrap items-center justify-between gap-3">
            <div>
              <CardTitle className="flex items-center gap-2 text-lg">
                <Megaphone className="h-5 w-5 text-[var(--good)] [stroke-width:1.7]" />
                {archive ? "Mitteilungen" : "Neues aus der Kita"}
              </CardTitle>
              <CardDescription>
                {archive
                  ? "Veröffentlichte Ankündigungen deiner Kita."
                  : "Die neuesten offiziellen Ankündigungen deiner Kita."}
              </CardDescription>
            </div>
            {archive ? (
              <Badge variant="secondary">{items.length} Meldungen</Badge>
            ) : (
              <Button asChild variant="outline" size="sm">
                <Link href="/dashboard/mitteilungen">Alle Mitteilungen</Link>
              </Button>
            )}
          </div>
        </CardHeader>
        <CardContent className="grid gap-3 lg:grid-cols-3">
          {items.length === 0 ? (
            <p className="col-span-full py-4 text-sm text-[var(--ink-soft)]">
              Noch keine Mitteilungen für deine Empfängergruppe.
            </p>
          ) : null}
          {items.map((item) => {
            const isUnread = item.isUnread && !readIds.has(item.id);
            return (
              <button
                key={item.id}
                type="button"
                onClick={() => openAnnouncement(item)}
                className="rounded-lg border border-[var(--hairline)] bg-[var(--surface)] p-4 text-left transition hover:border-[var(--accent-mid)] focus-visible:outline-none focus-visible:ring-[3px] focus-visible:ring-[var(--focus-ring)]"
              >
                <div className="mb-3 flex items-start justify-between gap-2">
                  <div className="flex items-center gap-2 text-xs text-[var(--ink-muted)]">
                    <Bell className="h-3.5 w-3.5 [stroke-width:1.7]" />
                    {item.createdAt}
                  </div>
                  {isUnread && <Badge variant="success">NEU</Badge>}
                </div>
                <h3 className="line-clamp-2 font-semibold leading-snug text-[var(--ink)]">
                  {item.title}
                </h3>
                <p className="mt-2 line-clamp-3 text-sm leading-6 text-[var(--ink-soft)]">
                  {item.excerpt}
                </p>
                {item.attachments.length > 0 && (
                  <p className="mt-3 flex items-center gap-1 text-xs font-medium text-[var(--accent-deep)]">
                    <FileText className="h-3.5 w-3.5 [stroke-width:1.7]" />
                    {item.attachments.length} Anhang
                    {item.attachments.length === 1 ? "" : "e"}
                  </p>
                )}
              </button>
            );
          })}
        </CardContent>
      </Card>

      <Dialog
        open={!!selected}
        onOpenChange={(open) => !open && setSelected(null)}
      >
        <DialogContent className="max-h-[90vh] overflow-y-auto sm:max-w-2xl">
          {selected && (
            <>
              <DialogHeader>
                <DialogTitle className="text-2xl">{selected.title}</DialogTitle>
                <DialogDescription>
                  {selected.createdAt} · {selected.authorName}
                </DialogDescription>
              </DialogHeader>

              <div className="rounded-lg border border-[var(--hairline)] bg-[var(--surface-2)] p-4 text-sm">
                <MarkdownContent content={selected.content} />
              </div>

              {selected.attachments.length > 0 && (
                <div>
                  <p className="mb-2 text-sm font-medium">Anhänge</p>
                  <div className="grid gap-2">
                    {selected.attachments.map((attachment) => (
                      <Button
                        key={attachment.id}
                        asChild
                        variant="outline"
                        className="justify-start"
                      >
                        <a
                          href={attachment.fileUrl}
                          target="_blank"
                          rel="noreferrer"
                        >
                          <FileText className="h-4 w-4 [stroke-width:1.7]" />
                          {attachment.fileName}
                        </a>
                      </Button>
                    ))}
                  </div>
                </div>
              )}
            </>
          )}
        </DialogContent>
      </Dialog>
    </>
  );
}