"use client";

import Image from "next/image";
import Link from "next/link";
import { useMemo, useState } from "react";
import { useCart } from "@/app/providers/cart-provider";
import { useAuth } from "@/app/providers/auth-provider";
import { useToast } from "@/app/providers/toast-provider";
import { submitComment } from "@/lib/meshkee/api";
import {
  formatPrice,
  storeItemName,
  storeItemPrice,
} from "@/lib/meshkee/format";
import type {
  Comment,
  Product,
  StoreItemVariant,
  TechnicalInfo,
} from "@/lib/meshkee/types";
import { customerLoginUrl, storeItemHref } from "@/lib/meshkee/urls";

type TabKey = "description" | "technical" | "comments";

export function StoreDetailClient({
  variant,
  product,
  technical,
  comments: initialComments,
  similar,
}: {
  variant: StoreItemVariant;
  product: Product;
  technical: TechnicalInfo;
  comments: Comment[];
  similar: StoreItemVariant[];
}) {
  const name = storeItemName(variant);
  const price = storeItemPrice(variant);
  const images = useMemo(() => {
    const list = (product.images ?? [])
      .map((image) => image.url)
      .filter(Boolean);
    const fallback = variant.productImage || product.thumbnailUrl || product.image;
    if (fallback && !list.includes(fallback)) list.unshift(fallback);
    return list;
  }, [product, variant]);

  const [activeImage, setActiveImage] = useState(images[0] || "");
  const [lightboxOpen, setLightboxOpen] = useState(false);
  const [tab, setTab] = useState<TabKey>("description");
  const [quantity, setQuantity] = useState(1);
  const [comments, setComments] = useState(initialComments);
  const [commentText, setCommentText] = useState("");
  const [submitting, setSubmitting] = useState(false);
  const { addItem } = useCart();
  const { isAuthenticated, user, getAccessToken } = useAuth();
  const { showToast } = useToast();

  const techRows = useMemo(() => {
    const fields = technical.form?.fields ?? [];
    if (!fields.length || !technical.values?.length) return [];
    return [...fields]
      .sort((a, b) => (a.sortOrder ?? 0) - (b.sortOrder ?? 0))
      .map((field) => {
        const value = technical.values.find((entry) => entry.fieldId === field.id);
        if (!value) return null;
        let display = value.textValue ?? "";
        if (value.optionId) {
          display =
            field.options?.find((option) => option.id === value.optionId)?.labelFa ||
            field.options?.find((option) => option.id === value.optionId)?.label ||
            display;
        }
        if (value.optionIds?.length) {
          display = value.optionIds
            .map(
              (id) =>
                field.options?.find((option) => option.id === id)?.labelFa ||
                field.options?.find((option) => option.id === id)?.label ||
                id,
            )
            .join("، ");
        }
        if (!display) return null;
        return {
          label: field.labelFa || field.label || field.key || "ویژگی",
          value: display,
        };
      })
      .filter(Boolean) as Array<{ label: string; value: string }>;
  }, [technical]);

  async function handleAddToCart() {
    await addItem({
      storeItemVariantId: variant.id,
      name,
      price,
      quantity,
      image: activeImage || variant.productImage,
      slug: product.slug || undefined,
    });
  }

  async function handleCommentSubmit(event: React.FormEvent) {
    event.preventDefault();
    if (!isAuthenticated || !user) return;
    const authorName =
      [user.firstName, user.lastName].filter(Boolean).join(" ").trim() || "کاربر";
    setSubmitting(true);
    try {
      await submitComment(
        {
          entityType: "product",
          entityId: product.id,
          authorName,
          authorEmail: user.email || undefined,
          text: commentText.trim(),
        },
        getAccessToken(),
      );
      setComments((prev) => [
        {
          id: `local-${Date.now()}`,
          authorName,
          text: commentText.trim(),
          createdAt: new Date().toISOString(),
        },
        ...prev,
      ]);
      setCommentText("");
      showToast("نظر شما ارسال شد و پس از تایید نمایش داده می‌شود");
    } catch (error) {
      showToast(error instanceof Error ? error.message : "ارسال نظر ناموفق بود");
    } finally {
      setSubmitting(false);
    }
  }

  return (
    <div className="store-detail">
      <div className="store-detail-gallery">
        <button
          type="button"
          className="store-main-image zoomable"
          onClick={() => activeImage && setLightboxOpen(true)}
        >
          {activeImage ? (
            <Image src={activeImage} alt={name} width={900} height={900} priority />
          ) : (
            <div className="store-card-fallback large" />
          )}
        </button>
        {images.length > 1 ? (
          <div className="store-thumbs">
            {images.map((image) => (
              <button
                key={image}
                type="button"
                className={image === activeImage ? "is-active" : ""}
                onClick={() => setActiveImage(image)}
              >
                <Image src={image} alt={name} width={120} height={120} />
              </button>
            ))}
          </div>
        ) : null}
      </div>

      <div className="store-detail-info">
        <p className="eyebrow">{variant.label || product.categoryNameFa || "Store Item"}</p>
        <h1>{name}</h1>
        <strong className="store-detail-price ltr-number" dir="ltr" lang="en">
          {formatPrice(price)}
        </strong>
        {variant.selections?.length ? (
          <ul className="store-selections">
            {variant.selections.map((selection, index) => (
              <li key={`${selection.optionId}-${index}`}>
                {selection.variationName}: {selection.value}
              </li>
            ))}
          </ul>
        ) : null}
        <div className="store-buy-row">
          <label>
            تعداد
            <input
              className="ltr-number"
              dir="ltr"
              lang="en"
              type="number"
              min={1}
              value={quantity}
              onChange={(event) =>
                setQuantity(Math.max(1, Number(event.target.value) || 1))
              }
            />
          </label>
          <button type="button" className="primary-btn" onClick={() => void handleAddToCart()}>
            افزودن به سبد خرید
          </button>
        </div>
      </div>

      <div className="store-detail-tabs">
        <div className="tab-list" role="tablist">
          {(
            [
              ["description", "توضیحات"],
              ["technical", "اطلاعات فنی"],
              ["comments", "نظرات"],
            ] as const
          ).map(([key, label]) => (
            <button
              key={key}
              type="button"
              role="tab"
              aria-selected={tab === key}
              className={tab === key ? "is-active" : ""}
              onClick={() => setTab(key)}
            >
              {label}
            </button>
          ))}
        </div>
        <div className="tab-panel">
          {tab === "description" ? (
            product.descriptionHtml ? (
              <div
                className="rich-html"
                dangerouslySetInnerHTML={{ __html: product.descriptionHtml }}
              />
            ) : (
              <p className="empty-note">توضیحاتی ثبت نشده است.</p>
            )
          ) : null}
          {tab === "technical" ? (
            techRows.length ? (
              <table className="tech-table">
                <tbody>
                  {techRows.map((row) => (
                    <tr key={row.label}>
                      <th>{row.label}</th>
                      <td>{row.value}</td>
                    </tr>
                  ))}
                </tbody>
              </table>
            ) : (
              <p className="empty-note">اطلاعات فنی موجود نیست.</p>
            )
          ) : null}
          {tab === "comments" ? (
            <div className="comments-block">
              {isAuthenticated ? (
                <form className="form" onSubmit={(event) => void handleCommentSubmit(event)}>
                  <textarea
                    required
                    value={commentText}
                    onChange={(event) => setCommentText(event.target.value)}
                    placeholder="نظر خود را بنویسید"
                  />
                  <button className="primary-btn" type="submit" disabled={submitting}>
                    ارسال نظر
                  </button>
                </form>
              ) : (
                <div className="login-box">
                  <p>برای ثبت نظر وارد حساب کاربری شوید.</p>
                  <a className="primary-btn" href={customerLoginUrl(`/store/${variant.id}`)}>
                    ورود / ثبت‌نام
                  </a>
                </div>
              )}
              <div className="comments-list">
                {comments.length === 0 ? (
                  <p className="empty-note">هنوز نظری ثبت نشده است.</p>
                ) : (
                  comments.map((comment) => (
                    <article key={comment.id}>
                      <h3>{comment.authorName || "کاربر"}</h3>
                      <p>{comment.text}</p>
                    </article>
                  ))
                )}
              </div>
            </div>
          ) : null}
        </div>
      </div>

      {similar.length > 0 ? (
        <section className="section similar-section">
          <h2>محصولات مشابه</h2>
          <div className="store-grid">
            {similar.map((item) => {
              const itemName = storeItemName(item);
              return (
                <Link key={item.id} href={storeItemHref(item.id, itemName)} className="store-card">
                  <div className="store-card-media">
                    {item.productImage ? (
                      <Image src={item.productImage} alt={itemName} width={320} height={320} />
                    ) : (
                      <div className="store-card-fallback" />
                    )}
                  </div>
                  <div className="store-card-body">
                    <h3>{itemName}</h3>
                    <strong className="ltr-number" dir="ltr" lang="en">
                      {formatPrice(storeItemPrice(item))}
                    </strong>
                  </div>
                </Link>
              );
            })}
          </div>
        </section>
      ) : null}

      {lightboxOpen && activeImage ? (
        <div className="lightbox" role="dialog" aria-modal="true">
          <button
            type="button"
            className="lightbox-backdrop"
            aria-label="بستن"
            onClick={() => setLightboxOpen(false)}
          />
          <div className="lightbox-content">
            <Image src={activeImage} alt={name} width={1200} height={1200} />
            <button type="button" className="icon-btn" onClick={() => setLightboxOpen(false)}>
              ✕
            </button>
          </div>
        </div>
      ) : null}
    </div>
  );
}