"use client";
import React, { useState, useEffect, useCallback } from "react";
import {
  Star,
  MessageSquare,
  CheckCircle2,
  Reply,
  Loader2,
  ChevronLeft,
  ChevronRight,
  Send,
  User,
  ShieldCheck,
} from "lucide-react";
import { toast } from "sonner";
import api from "../lib/services/api";
import { toPersian } from "../lib/utils";

interface ReviewItem {
  id: string;
  userName: string;
  rating: number;
  comment: string;
  adminReply?: string;
  createdAt: string;
}

interface ProductReviewsProps {
  productId: string;
  productName: string;
}

export default function ProductReviews({ productId, productName }: ProductReviewsProps) {
  const [reviews, setReviews] = useState<ReviewItem[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [page, setPage] = useState(1);
  const [totalPages, setTotalPages] = useState(1);
  const [stats, setStats] = useState({ averageRating: 5, totalReviews: 0 });

  // Submission Form State
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [rating, setRating] = useState(5);
  const [hoverRating, setHoverRating] = useState(0);
  const [comment, setComment] = useState("");
  const [userName, setUserName] = useState("");
  const [userPhone, setUserPhone] = useState("");
  const [formOpen, setFormOpen] = useState(false);

  const fetchReviews = useCallback(async () => {
    if (!productId) return;
    try {
      setIsLoading(true);
      const res = await api.get(`/products/${productId}/reviews?page=${page}&limit=5`);
      if (res.data?.success) {
        setReviews(res.data.data || []);
        setTotalPages(res.data.pagination?.totalPages || 1);
        if (res.data.stats) {
          setStats(res.data.stats);
        }
      }
    } catch (err: unknown) {
      console.error("Failed to fetch product reviews:", err);
    } finally {
      setIsLoading(false);
    }
  }, [productId, page]);

  useEffect(() => {
    fetchReviews();
  }, [fetchReviews]);

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!comment.trim()) {
      toast.error("لطفاً متن نظر خود را وارد نمایید.");
      return;
    }

    try {
      setIsSubmitting(true);
      const res = await api.post(`/products/${productId}/reviews`, {
        rating,
        comment: comment.trim(),
        userName: userName.trim() || undefined,
        userPhone: userPhone.trim() || undefined,
      });

      if (res.data?.success) {
        toast.success(
          res.data.message || "دیدگاه شما با موفقیت ثبت شد و پس از تایید کارشناسان منتشر خواهد شد."
        );
        setComment("");
        setFormOpen(false);
      }
    } catch (err: unknown) {
      console.error("Failed to submit review:", err);
    } finally {
      setIsSubmitting(false);
    }
  };

  return (
    <section className="bg-white border border-medical-gray-200 rounded-[2.5rem] p-6 sm:p-10 shadow-md space-y-8 font-vazir text-right" dir="rtl">
      {/* Header & Rating Summary */}
      <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-6 pb-6 border-b border-medical-gray-100">
        <div className="space-y-1 text-right">
          <div className="flex items-center gap-3">
            <div className="w-12 h-12 bg-canina-gold/10 text-canina-gold rounded-2xl flex items-center justify-center shadow-xs shrink-0">
              <Star className="w-6 h-6 fill-canina-gold" />
            </div>
            <div>
              <h3 className="text-xl sm:text-2xl font-black text-medical-gray-900">
                نظرات و تجربیات خریداران
              </h3>
              <p className="text-xs text-medical-gray-400 font-bold mt-0.5">
                دیدگاه‌های ثبت‌شده درباره اثرگذاری مکمل {productName}
              </p>
            </div>
          </div>
        </div>

        {/* Rating Score Badge & Add Review Button */}
        <div className="flex flex-wrap items-center gap-3 justify-start sm:justify-end">
          <div className="flex items-center gap-2.5 px-4 py-2.5 bg-medical-gray-50 border border-medical-gray-100 rounded-2xl">
            <div className="flex items-center gap-0.5">
              {Array.from({ length: 5 }).map((_, i) => (
                <Star
                  key={i}
                  className={`w-3.5 h-3.5 ${
                    i < Math.round(stats.averageRating)
                      ? "fill-amber-400 text-amber-400"
                      : "text-medical-gray-200"
                  }`}
                />
              ))}
            </div>
            <div className="text-xs font-black text-medical-gray-900">
              {toPersian(stats.averageRating)} از ۵
            </div>
            <span className="text-[11px] text-medical-gray-400 font-bold border-r border-medical-gray-200 pr-2">
              ({toPersian(stats.totalReviews)} دیدگاه)
            </span>
          </div>

          <button
            type="button"
            onClick={() => setFormOpen(!formOpen)}
            className="px-5 py-2.5 bg-medical-gray-900 hover:bg-canina-blue text-white rounded-2xl text-xs font-black transition-all shadow-md shadow-black/10 flex items-center gap-2 cursor-pointer"
          >
            <MessageSquare className="w-4 h-4" />
            <span>{formOpen ? "بستن فرم" : "ثبت دیدگاه جدید"}</span>
          </button>
        </div>
      </div>

      {/* Submission Form (Accordion / Collapsible) */}
      {formOpen && (
        <form
          onSubmit={handleSubmit}
          className="bg-medical-gray-50/80 border border-medical-gray-200 rounded-3xl p-6 sm:p-8 space-y-5 animate-in fade-in duration-200"
        >
          <div className="flex items-center justify-between border-b border-medical-gray-200 pb-3">
            <h4 className="text-sm font-black text-medical-gray-900 flex items-center gap-2">
              <Send className="w-4 h-4 text-canina-blue" />
              ارسال نظر و امتیاز برای {productName}
            </h4>
            <span className="text-[11px] text-medical-gray-400 font-bold">
              نظر شما پس از تایید مدیریت نمایش داده می‌شود
            </span>
          </div>

          {/* Star Rating Selector */}
          <div>
            <label className="block text-xs font-black text-medical-gray-700 mb-2">
              امتیاز شما به کیفیت و اثرگذاری محصول:
            </label>
            <div className="flex items-center gap-2">
              {Array.from({ length: 5 }).map((_, i) => {
                const starVal = i + 1;
                const active = starVal <= (hoverRating || rating);
                return (
                  <button
                    type="button"
                    key={i}
                    onMouseEnter={() => setHoverRating(starVal)}
                    onMouseLeave={() => setHoverRating(0)}
                    onClick={() => setRating(starVal)}
                    className="p-1 text-2xl transition-transform hover:scale-110"
                  >
                    <Star
                      className={`w-7 h-7 ${
                        active
                          ? "fill-amber-400 text-amber-400"
                          : "text-medical-gray-300"
                      }`}
                    />
                  </button>
                );
              })}
              <span className="text-xs font-bold text-medical-gray-600 mr-2">
                {toPersian(rating)} ستاره
              </span>
            </div>
          </div>

          {/* Name & Phone Inputs */}
          <div className="grid sm:grid-cols-2 gap-4">
            <div>
              <label className="block text-xs font-black text-medical-gray-700 mb-1.5">
                نام و نام خانوادگی (اختیاری):
              </label>
              <input
                type="text"
                value={userName}
                onChange={(e) => setUserName(e.target.value)}
                placeholder="مثلاً علی محمدی"
                className="w-full px-4 py-2.5 bg-white border border-medical-gray-200 rounded-xl text-xs font-bold outline-none focus:ring-2 focus:ring-canina-blue/20"
              />
            </div>
            <div>
              <label className="block text-xs font-black text-medical-gray-700 mb-1.5">
                شماره موبایل (اختیاری - محرمانه):
              </label>
              <input
                type="tel"
                value={userPhone}
                onChange={(e) => setUserPhone(e.target.value)}
                placeholder="0912..."
                className="w-full px-4 py-2.5 bg-white border border-medical-gray-200 rounded-xl text-xs font-bold outline-none focus:ring-2 focus:ring-canina-blue/20 font-mono"
                dir="ltr"
              />
            </div>
          </div>

          {/* Comment Textarea */}
          <div>
            <label className="block text-xs font-black text-medical-gray-700 mb-1.5">
              متن دیدگاه یا تجربه مصرف: <span className="text-rose-500">*</span>
            </label>
            <textarea
              required
              rows={4}
              value={comment}
              onChange={(e) => setComment(e.target.value)}
              placeholder="تجربه خود را از نحوه مصرف، تغییرات بالینی پت و اثربخشی این مکمل بنویسید..."
              className="w-full p-4 bg-white border border-medical-gray-200 rounded-2xl text-xs sm:text-sm font-medium outline-none focus:ring-2 focus:ring-canina-blue/20 resize-none leading-relaxed"
            />
          </div>

          <div className="flex justify-end gap-3 pt-2">
            <button
              type="button"
              onClick={() => setFormOpen(false)}
              className="px-5 py-2.5 bg-medical-gray-200 hover:bg-medical-gray-300 text-medical-gray-700 rounded-xl text-xs font-bold transition-all"
            >
              انصراف
            </button>
            <button
              type="submit"
              disabled={isSubmitting}
              className="px-6 py-2.5 bg-canina-blue hover:bg-canina-dark text-white rounded-xl text-xs font-black transition-all shadow-md flex items-center gap-2"
            >
              {isSubmitting ? (
                <Loader2 className="w-4 h-4 animate-spin" />
              ) : (
                <CheckCircle2 className="w-4 h-4" />
              )}
              <span>ثبت و ارسال دیدگاه</span>
            </button>
          </div>
        </form>
      )}

      {/* Reviews List */}
      <div className="space-y-4">
        {isLoading ? (
          <div className="py-12 text-center text-medical-gray-400 font-bold text-xs flex flex-col items-center gap-2">
            <Loader2 className="w-6 h-6 animate-spin text-canina-blue" />
            <span>در حال دریافت نظرات خریداران...</span>
          </div>
        ) : reviews.length === 0 ? (
          <div className="py-12 text-center bg-medical-gray-50/50 border border-dashed border-medical-gray-200 rounded-3xl">
            <p className="text-sm font-bold text-medical-gray-500">
              هنوز دیدگاهی برای این محصول ثبت نشده است.
            </p>
            <p className="text-xs text-medical-gray-400 font-medium mt-1">
              اولین نفری باشید که تجربه خود را درباره این محصول به اشتراک می‌گذارید.
            </p>
          </div>
        ) : (
          reviews.map((rev) => {
            const date = new Date(rev.createdAt);
            return (
              <div
                key={rev.id}
                className="bg-medical-gray-50/60 border border-medical-gray-100 rounded-3xl p-5 sm:p-6 space-y-3 hover:bg-medical-gray-50 transition-colors"
              >
                <div className="flex flex-wrap items-center justify-between gap-3">
                  <div className="flex items-center gap-2.5">
                    <div className="w-9 h-9 bg-canina-blue/10 text-canina-blue rounded-xl flex items-center justify-center font-black text-xs">
                      <User className="w-4 h-4" />
                    </div>
                    <div>
                      <div className="text-xs sm:text-sm font-black text-medical-gray-900 flex items-center gap-2">
                        <span>{rev.userName}</span>
                        <span className="inline-flex items-center gap-1 text-[10px] font-bold text-emerald-600 bg-emerald-50 px-2 py-0.5 rounded-md border border-emerald-200">
                          <ShieldCheck className="w-3 h-3" />
                          خریدار تایید شده
                        </span>
                      </div>
                      <div className="text-[10px] text-medical-gray-400 font-bold mt-0.5">
                        {toPersian(date.toLocaleDateString("fa-IR"))}
                      </div>
                    </div>
                  </div>

                  {/* Stars */}
                  <div className="flex items-center gap-1">
                    {Array.from({ length: 5 }).map((_, i) => (
                      <Star
                        key={i}
                        className={`w-3.5 h-3.5 ${
                          i < rev.rating
                            ? "fill-amber-400 text-amber-400"
                            : "text-medical-gray-200"
                        }`}
                      />
                    ))}
                  </div>
                </div>

                {/* Review Text */}
                <p className="text-xs sm:text-sm text-medical-gray-700 font-medium leading-relaxed whitespace-pre-wrap pt-1">
                  {rev.comment}
                </p>

                {/* Admin Reply */}
                {rev.adminReply && (
                  <div className="mt-3 p-3.5 bg-white border-r-3 border-canina-blue rounded-2xl text-xs space-y-1 shadow-xs">
                    <span className="font-black text-canina-blue flex items-center gap-1">
                      <Reply className="w-3.5 h-3.5 rotate-180" />
                      پاسخ کارشناس کنینا ایران:
                    </span>
                    <p className="text-medical-gray-600 font-medium leading-relaxed">
                      {rev.adminReply}
                    </p>
                  </div>
                )}
              </div>
            );
          })
        )}

        {/* Pagination Controls */}
        {totalPages > 1 && (
          <div className="flex items-center justify-between pt-4 border-t border-medical-gray-100">
            <span className="text-xs font-bold text-medical-gray-400">
              صفحه {toPersian(page)} از {toPersian(totalPages)}
            </span>
            <div className="flex items-center gap-2">
              <button
                disabled={page <= 1 || isLoading}
                onClick={() => setPage((p) => Math.max(1, p - 1))}
                className="px-3 py-1.5 border border-medical-gray-200 rounded-xl text-xs font-bold hover:bg-medical-gray-50 disabled:opacity-40 transition-all flex items-center gap-1"
              >
                <ChevronRight className="w-4 h-4" />
                <span>قبلی</span>
              </button>
              <button
                disabled={page >= totalPages || isLoading}
                onClick={() => setPage((p) => Math.min(totalPages, p + 1))}
                className="px-3 py-1.5 border border-medical-gray-200 rounded-xl text-xs font-bold hover:bg-medical-gray-50 disabled:opacity-40 transition-all flex items-center gap-1"
              >
                <span>بعدی</span>
                <ChevronLeft className="w-4 h-4" />
              </button>
            </div>
          </div>
        )}
      </div>
    </section>
  );
}