import { useEffect, useRef, useState } from 'react';
import { ListFilter, RefreshCw, ShieldCheck, Sparkles, type LucideIcon } from 'lucide-react';
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogDescription,
} from '@/components/ui/dialog';
import { Button } from '@/components/ui/button';
import { RELEASE_NOTES } from '@/lib/version';
import { BrandGlyph } from '@/components/brand/Brand';
import { useAuth } from '@/hooks/useAuth';
import { api } from '@/api';
import type { ReleaseHighlightIcon } from '@/lib/version';

const releaseIcon: Record<ReleaseHighlightIcon, LucideIcon> = {
  sparkles: Sparkles,
  filter: ListFilter,
  sync: RefreshCw,
  shield: ShieldCheck,
};

export function ReleaseNotesDialog() {
  const { hasNewVersion, setHasNewVersion } = useAuth();
  const [open, setOpen] = useState(false);
  const titleRef = useRef<HTMLHeadingElement>(null);

  useEffect(() => {
    if (hasNewVersion) setOpen(true);
  }, [hasNewVersion]);

  const handleClose = () => {
    setOpen(false);
    setHasNewVersion(false); // optimistic — don't wait for the server
    api
      .acknowledgeVersion()
      .catch((err) => console.error('[ReleaseNotesDialog] failed to acknowledge version', err)); // backend stores the seen release version
    const prev = document.activeElement as HTMLElement | null;
    if (prev?.focus) setTimeout(() => prev.focus(), 0);
  };

  return (
    <Dialog
      open={open}
      onOpenChange={(v) => {
        if (!v) handleClose();
      }}
    >
      <DialogContent className="max-h-[92dvh] max-w-md overflow-y-auto sm:max-w-lg">
        <DialogHeader>
          <div className="flex items-center gap-2 mb-1">
            <BrandGlyph name="tracker" className="h-8 w-8 rounded-lg" />
            <span className="text-xs font-medium text-muted-foreground uppercase tracking-wider">
              v{RELEASE_NOTES.version} · {RELEASE_NOTES.date}
            </span>
          </div>
          <DialogTitle ref={titleRef} className="text-xl">
            What's new
          </DialogTitle>
          <DialogDescription className="sr-only">
            Release highlights for Bill Tracker v{RELEASE_NOTES.version}
          </DialogDescription>
        </DialogHeader>

        <div className="mt-2 space-y-3" role="list" aria-label="Release highlights">
          {RELEASE_NOTES.highlights.map((item) => {
            const Icon = releaseIcon[item.icon];
            return (
              <div key={item.title} className="flex gap-3 items-start" role="listitem">
                <span
                  className="mt-0.5 grid h-8 w-8 shrink-0 place-items-center rounded-lg border border-primary/20 bg-primary/10 text-primary"
                  aria-hidden="true"
                >
                  <Icon className="h-4 w-4" />
                </span>
                <div>
                  <p className="text-sm font-medium text-foreground">{item.title}</p>
                  <p className="text-xs text-muted-foreground mt-0.5 leading-relaxed">
                    {item.desc}
                  </p>
                </div>
              </div>
            );
          })}
        </div>

        {RELEASE_NOTES.image && (
          <figure className="mt-5 flex justify-center">
            <div className="w-full max-w-sm overflow-hidden rounded-xl border border-border bg-muted/20 shadow-sm sm:max-w-md">
              <img
                src={RELEASE_NOTES.image.src}
                alt={RELEASE_NOTES.image.alt}
                loading="lazy"
                className="aspect-16/10 w-full object-contain"
              />
            </div>
          </figure>
        )}

        <div className="mt-4 pt-4 border-t border-border flex items-center justify-end">
          <Button size="sm" onClick={handleClose}>
            Got it
          </Button>
        </div>
      </DialogContent>
    </Dialog>
  );
}