"use client";

import { useEffect, useRef, useState, type CSSProperties } from "react";
import { AD_TIP_DELAY_MS, adHoverTip } from "@/lib/ads";

type AdTextProps = {
  title: string;
  textColor?: string;
  bgColor?: string;
  href?: string;
  /** 广告到期时间（ISO 字符串）：有值时气泡首行展示，无值时仅显示免责声明 */
  endsAt?: string | null;
  className?: string;
};

/**
 * 文字广告：仅当文字宽度超出容器时才启用跑马灯滚动，
 * 能完整显示时居中静止。结构与样式复用侧栏 .j13-ad-text。
 */
export function AdText({
  title,
  textColor,
  bgColor,
  href,
  endsAt,
  className = "",
}: AdTextProps) {
  const trackRef = useRef<HTMLSpanElement>(null);
  const [overflow, setOverflow] = useState(false);

  useEffect(() => {
    const track = trackRef.current;
    if (!track) return;
    const measure = () => {
      const run = track.querySelector<HTMLElement>(".j13-ad-text-run");
      const container = track.parentElement;
      if (!run || !container) return;
      setOverflow(run.scrollWidth > container.clientWidth);
    };
    measure();
    window.addEventListener("resize", measure);
    return () => window.removeEventListener("resize", measure);
  }, [title]);

  const cls = `j13-ad-text${overflow ? " is-overflow" : ""}${className ? ` ${className}` : ""}`;
  const style: CSSProperties = { color: textColor, background: bgColor };

  // 气泡首行：到期时间；第二行：免责声明
  const tip = adHoverTip(endsAt);

  const inner = (
    <span
      className={`j13-ad-text-track${overflow ? " is-overflow" : ""}`}
      ref={trackRef}
    >
      <span className="j13-ad-text-run">{title}</span>
      {overflow ? (
        <span className="j13-ad-text-run" aria-hidden>
          {title}
        </span>
      ) : null}
    </span>
  );

  if (href) {
    return (
      <a
        href={href}
        target="_blank"
        rel="noopener noreferrer sponsored"
        className={cls}
        style={style}
        data-tip={tip}
        data-tip-delay={AD_TIP_DELAY_MS}
      >
        {inner}
      </a>
    );
  }
  return (
    <span
      className={cls}
      style={style}
      data-tip={tip}
      data-tip-delay={AD_TIP_DELAY_MS}
    >
      {inner}
    </span>
  );
}

export default AdText;