"use client";
import React, { useEffect, useState } from "react";
import { HelpCircle, ChevronDown } from "lucide-react";
import { motion, AnimatePresence } from "motion/react";
import { useSettingsStore } from "../lib/store/settingsStore";
import { safeJsonLd } from "../lib/schema";
import api from "../lib/services/api";

export interface FAQItem {
  id: string;
  question: string;
  answer: string;
  order: number;
}

export default function FAQSection() {
  const getText = useSettingsStore((state) => state.getText);
  const [faqs, setFaqs] = useState<FAQItem[]>([]);
  const [openIndex, setOpenIndex] = useState<number | null>(0);
  const [isLoading, setIsLoading] = useState(true);

  useEffect(() => {
    async function loadFaqs() {
      try {
        setIsLoading(true);
        const res = await api.get("/faq");
        const list = Array.isArray(res.data) ? res.data : [];
        setFaqs(list);
      } catch (err) {
        console.error("Failed to load FAQs:", err);
        setFaqs([]);
      } finally {
        setIsLoading(false);
      }
    }
    loadFaqs();
  }, []);

  if (!isLoading && faqs.length === 0) {
    return null;
  }

  // Schema.org FAQPage JSON-LD structure
  const faqSchema = {
    "@context": "https://schema.org",
    "@type": "FAQPage",
    "mainEntity": faqs.map((faq) => ({
      "@type": "Question",
      "name": faq.question,
      "acceptedAnswer": {
        "@type": "Answer",
        "text": faq.answer,
      },
    })),
  };

  return (
    <section className="py-8 sm:py-20 bg-medical-gray-50/70 border-t border-medical-gray-100 font-vazir" dir="rtl">
      {/* Schema.org FAQPage Rich Snippet */}
      {faqs.length > 0 && (
        <script
          type="application/ld+json"
          dangerouslySetInnerHTML={{ __html: safeJsonLd(faqSchema) }}
        />
      )}

      <div className="max-w-4xl mx-auto px-4">
        {/* Header */}
        <div className="text-center mb-6 sm:mb-12">
          <div className="inline-flex items-center gap-2 px-3.5 py-1.5 bg-canina-blue/10 text-canina-blue rounded-full text-[10px] font-black uppercase tracking-widest mb-3 sm:mb-4">
            <HelpCircle className="w-3.5 h-3.5" />
            <span>{getText("faq_badge", "پاسخ به سوالات پرتکرار")}</span>
          </div>
          <h2 className="text-2xl sm:text-4xl md:text-5xl font-black text-medical-gray-900 leading-tight font-lalezar tracking-wide">
            {getText("faq_title_1", "سوالات متداول")} <span className="text-canina-blue">{getText("faq_title_2", "درباره محصولات و سفارش")}</span>
          </h2>
          <p className="text-sm sm:text-base text-medical-gray-500 font-medium mt-2 sm:mt-4">
            {getText("faq_desc", "پاسخ به متداول‌ترین سوالات درباره استانداردها، دوز مصرفی، ارسال و اصالت مکمل‌های کنینا.")}
          </p>
        </div>

        {/* FAQ List */}
        {isLoading ? (
          <div className="space-y-4">
            {[1, 2, 3].map((i) => (
              <div key={i} className="h-16 bg-white rounded-2xl border border-medical-gray-100 animate-pulse" />
            ))}
          </div>
        ) : (
          <div className="space-y-4">
            {faqs.map((faq, idx) => {
              const isOpen = openIndex === idx;
              return (
                <div
                  key={faq.id || idx}
                  className="bg-white rounded-2xl border border-medical-gray-100 overflow-hidden shadow-xs hover:border-canina-blue/30 transition-all"
                >
                  <button
                    onClick={() => setOpenIndex(isOpen ? null : idx)}
                    className="w-full p-6 text-right flex items-center justify-between gap-4 font-bold text-medical-gray-900 hover:text-canina-blue transition-colors"
                  >
                    <span className="text-base font-shabnam">{faq.question}</span>
                    <ChevronDown
                      className={`w-5 h-5 shrink-0 text-medical-gray-400 transition-transform duration-300 ${
                        isOpen ? "rotate-180 text-canina-blue" : ""
                      }`}
                    />
                  </button>

                  <AnimatePresence initial={false}>
                    {isOpen && (
                      <motion.div
                        initial={{ height: 0, opacity: 0 }}
                        animate={{ height: "auto", opacity: 1 }}
                        exit={{ height: 0, opacity: 0 }}
                        transition={{ duration: 0.25 }}
                        className="overflow-hidden"
                      >
                        <div className="px-6 pb-6 pt-0 text-sm text-medical-gray-600 leading-relaxed font-normal border-t border-medical-gray-50">
                          {faq.answer}
                        </div>
                      </motion.div>
                    )}
                  </AnimatePresence>
                </div>
              );
            })}
          </div>
        )}
      </div>
    </section>
  );
}