/**
 * ExChatbotBanner — 타 사이트 임베드용 검색 배너 SDK (iframe)
 * @example
 * <div id="ex-chatbot-banner"></div>
 * <script src="https://chatbot.exdev.co.kr/chatbot/banner/embed.js"></script>
 * <script>
 *   ExChatbotBanner.init({ container: "#ex-chatbot-banner" });
 * </script>
 */
(function (global) {
  "use strict";

  var DEFAULT_BASE = "https://chatbot.exdev.co.kr/chatbot/banner/";

  function resolveContainer(el) {
    if (!el) return null;
    if (typeof el === "string") return document.querySelector(el);
    return el;
  }

  function init(options) {
    options = options || {};
    var container = resolveContainer(options.container);
    if (!container) {
      console.error("[ExChatbotBanner] container not found");
      return null;
    }

    var baseUrl = (options.baseUrl || DEFAULT_BASE).replace(/\/?$/, "/");
    var params = new URLSearchParams();
    if (options.embed !== false) params.set("embed", "1");
    if (options.placeholder) params.set("placeholder", String(options.placeholder));
    var qs = params.toString();
    var src = baseUrl + (qs ? "?" + qs : "");

    var minHeight = Number(options.minHeight) || 56;
    var maxHeight = Number(options.maxHeight) || 520;
    var height = Number(options.height) || minHeight;

    var wrap = document.createElement("div");
    wrap.className = "ex-chatbot-banner-widget";
    wrap.style.cssText =
      "position:relative;width:100%;max-width:" +
      (options.maxWidth || "720px") +
      ";margin:0 auto;";

    var iframe = document.createElement("iframe");
    iframe.src = src;
    iframe.title = options.title || "한국도로공사 AI 검색";
    iframe.setAttribute("allow", "clipboard-write");
    iframe.loading = options.loading || "lazy";
    iframe.style.cssText =
      "display:block;width:100%;border:0;overflow:hidden;min-height:" +
      minHeight +
      "px;height:" +
      height +
      "px;transition:height 0.15s ease;";

    function onMessage(ev) {
      if (!ev.data || ev.data.type !== "ex-chatbot-banner-resize") return;
      if (ev.source !== iframe.contentWindow) return;
      var h = Number(ev.data.height);
      if (h > 0) {
        iframe.style.height = Math.min(Math.max(h, minHeight), maxHeight) + "px";
      }
    }

    global.addEventListener("message", onMessage);
    wrap.appendChild(iframe);
    container.appendChild(wrap);

    return {
      destroy: function () {
        global.removeEventListener("message", onMessage);
        wrap.remove();
      },
      iframe: iframe,
    };
  }

  global.ExChatbotBanner = {
    init: init,
    version: "1.0.0",
  };
})(typeof window !== "undefined" ? window : globalThis);