import {
  Accordion,
  AccordionContent,
  AccordionItem,
  AccordionTrigger,
} from "@/components/ui/accordion";
import { HelpCircle } from "lucide-react";
import { Dictionary } from "@/lib/IDict";
import { pb } from "@/lib/pb";

interface PBFaq {
  id: string;
  question: string;
  answer: string;
  lang: string;
  order: number;
}

// Теперь это Server Component
export async function FAQ({
  dict,
  lang,
}: {
  dict: Dictionary["faq"];
  lang: string;
}) {
  let faqs: PBFaq[] = [];
  // Различаем "PocketBase ответил, но для этого языка коллекции ещё нет" (штатно,
  // это и есть fallback на en ниже) от "PocketBase вообще не ответил ни разу" —
  // раньше оба случая одинаково показывали "0 protocols found", что вводит в
  // заблуждение при реальном сбое инфраструктуры (выглядит как "у нас нет FAQ",
  // а не "сейчас не грузится").
  let hadFetchError = false;

  for (const fallbackLang of Array.from(new Set([lang, "en"]))) {
    try {
      faqs = await pb.collection(`faqs_${fallbackLang}`).getFullList<PBFaq>({
        sort: "order",
        fetch: (url, config) =>
          fetch(url, { ...config, next: { revalidate: 86400 } }), // Кэшируем на сутки
      });
      hadFetchError = false;
      break;
    } catch (error) {
      hadFetchError = true;
      console.error(`Ошибка загрузки FAQ (${fallbackLang}):`, error);
    }
  }

  const formatAnswer = (text: string) => {
    return text.split("\n").map((line, i) => {
      const trimmedLine = line.trim();
      if (trimmedLine.startsWith("•")) {
        return (
          <div key={i} className="flex gap-3 mb-2 pl-2 group">
            <span className="text-secondary font-bold group-hover:animate-pulse">
              •
            </span>
            <span className="text-muted-foreground/90">
              {trimmedLine.replace("•", "").trim()}
            </span>
          </div>
        );
      }
      if (!trimmedLine) return <div key={i} className="h-4" />;
      return (
        <p
          key={i}
          className="mb-3 last:mb-0 text-muted-foreground/90 leading-relaxed"
        >
          {line}
        </p>
      );
    });
  };

  return (
    <section
      id="faq"
      className="py-32 px-4 container mx-auto max-w-4xl relative"
    >
      <div className="absolute inset-0 bg-[radial-gradient(circle_at_center,_var(--tw-gradient-stops))] from-primary/10 dark:from-primary/20 via-transparent to-transparent blur-[100px] pointer-events-none -z-10" />

      <div className="flex flex-col items-center mb-16">
        <div className="bg-primary/10 p-3 rounded-2xl mb-6 border border-primary/20 cursor-net-help">
          <HelpCircle className="w-8 h-8 text-primary" />
        </div>
        <h2 className="text-4xl md:text-5xl font-black tracking-tight text-center">
          {dict.title}
        </h2>
      </div>

      {faqs.length === 0 ? (
        <div className="text-center py-20 border border-dashed border-border/50 rounded-[2.5rem] bg-card/20">
          <p className="text-muted-foreground font-mono text-sm uppercase tracking-widest">
            {hadFetchError ? dict.loadError : "0 protocols found in cache."}
          </p>
        </div>
      ) : (
        <Accordion type="single" collapsible className="w-full space-y-4">
          {faqs.map((faq) => (
            <AccordionItem
              key={faq.id}
              value={`item-${faq.id}`}
              className="border border-border/40 bg-card/30 backdrop-blur-md rounded-[1.5rem] px-6 transition-all duration-300 hover:border-primary/30 data-[state=open]:border-primary/50 data-[state=open]:bg-card/50 shadow-sm"
            >
              <AccordionTrigger className="text-left text-foreground hover:no-underline hover:text-primary transition-colors font-bold text-lg md:text-xl py-6">
                {faq.question}
              </AccordionTrigger>
              <AccordionContent className="pb-8 text-base antialiased">
                <div className="border-t border-border/30 pt-6">
                  {formatAnswer(faq.answer)}
                </div>
              </AccordionContent>
            </AccordionItem>
          ))}
        </Accordion>
      )}
    </section>
  );
}