import { Card, CardContent } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { Megaphone, AlertTriangle, AlertCircle, Info } from "lucide-react";
import { useAnnouncements } from "@/hooks/queries";
import type { Announcement } from "@/types/communication";

const priorityConfig: Record<Announcement["priority"], { variant: "destructive" | "default" | "secondary"; icon: React.ReactNode }> = {
  urgent: { variant: "destructive", icon: <AlertTriangle className="h-4 w-4" /> },
  important: { variant: "default", icon: <AlertCircle className="h-4 w-4" /> },
  normal: { variant: "secondary", icon: <Info className="h-4 w-4" /> },
};

export default function StudentAnnouncements() {
  const { data: announcements = [], isLoading } = useAnnouncements();

  const sorted = [...announcements]
    .filter(a => a.is_published)
    .sort((a, b) => new Date(b.published_at ?? b.expires_at ?? "").getTime() - new Date(a.published_at ?? a.expires_at ?? "").getTime());

  if (isLoading) return <div className="flex items-center justify-center min-h-[400px]"><div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary" /></div>;

  return (
    <div className="space-y-6">
      <div>
        <h1 className="text-2xl font-bold">Announcements</h1>
        <p className="text-muted-foreground">Stay up to date with the latest announcements from your courses.</p>
      </div>

      <div className="space-y-3">
        {sorted.map(a => {
          const cfg = priorityConfig[a.priority];
          return (
            <Card key={a.id} className={a.priority === "urgent" ? "border-destructive/30" : ""}>
              <CardContent className="flex items-start gap-4 py-4">
                <div className={`h-10 w-10 rounded-lg flex items-center justify-center shrink-0 ${a.priority === "urgent" ? "bg-destructive/10 text-destructive" : a.priority === "important" ? "bg-yellow-500/10 text-yellow-600" : "bg-primary/10 text-primary"}`}>
                  {cfg.icon}
                </div>
                <div className="flex-1 min-w-0">
                  <div className="flex items-center gap-2 flex-wrap">
                    <span className="font-medium">{a.title}</span>
                    <Badge variant={cfg.variant}>{a.priority}</Badge>
                  </div>
                  <p className="text-sm text-muted-foreground mt-1">{a.content}</p>
                  <div className="flex items-center gap-2 mt-2 text-xs text-muted-foreground">
                    <span>{a.author_name}</span>
                    {a.course_name && <><span>·</span><span>{a.course_name}</span></>}
                    {a.published_at && <><span>·</span><span>{new Date(a.published_at).toLocaleDateString()}</span></>}
                  </div>
                </div>
              </CardContent>
            </Card>
          );
        })}
        {sorted.length === 0 && (
          <Card>
            <CardContent className="py-12 text-center text-muted-foreground">
              <Megaphone className="h-12 w-12 mx-auto mb-3 opacity-40" />
              <p>No announcements right now.</p>
            </CardContent>
          </Card>
        )}
      </div>
    </div>
  );
}