"use strict";
// Explicit CCRD pilot bridge. No URL text import, automatic synthesis or wildcard
// postMessage. Parent identity and exact iframe Window are both mandatory.
(() => {
  if (!embeddedReader) return;
  const PARENT = "https://vomebook-search.hf.space";
  let channel = "", imported = null, replacement = null, modal = false;
  const title = document.createElement("p");
  title.className = "note embed-source";
  document.querySelector("main").prepend(title);
  const confirmation = document.createElement("div");
  confirmation.className = "actions";
  confirmation.hidden = true;
  const replace = document.createElement("button"), keep = document.createElement("button");
  replace.type = keep.type = "button";
  replace.id = "embed-replace"; keep.id = "embed-keep";
  replace.textContent = "停止原朗读并替换文字"; keep.textContent = "保留原朗读";
  confirmation.append(replace, keep);
  title.after(confirmation);
  function send(type, extra = {}) {
    if (channel) window.parent.postMessage({ type, channel, ...extra }, PARENT);
  }
  function validText(text, max, allowEmpty = false) {
    if (typeof text !== "string" || (!allowEmpty && !text.trim())) return false;
    let count = 0;
    for (const _ of text) if (++count > max) return false;
    return true;
  }
  function focusable() {
    return Array.from(document.querySelectorAll("button, a[href], input, select, textarea, audio[controls], [tabindex]:not([tabindex='-1'])"))
      .filter(node => !node.disabled && !node.hidden && node.getClientRects().length);
  }
  function load(data) {
    replacement = null;
    confirmation.hidden = true;
    stop({ message: "已载入 CCRD 正文；确认文字后点击合成才向语音 API 提交。" });
    imported = { text: data.text, context_before: data.context_before, context_after: data.context_after };
    bookmark = null;
    $("#remember").checked = false;
    $("#speech-text").value = data.text;
    $("#reader-view").hidden = true;
    $("#reader-source").replaceChildren();
    $("#position").textContent = "";
    $("#metrics").textContent = "";
    $("#reading-progress").value = 0;
    title.textContent = "CCRD · " + data.title;
    controls();
    send("ccrd-reader-loaded", { characters: Array.from(data.text).length });
  }
  replace.addEventListener("click", () => { if (replacement) load(replacement); });
  keep.addEventListener("click", () => { replacement = null; confirmation.hidden = true; send("ccrd-reader-rejected"); });
  window.HitokotoEmbed = {
    context(plan, text) {
      if (!imported || text !== imported.text || !plan.length) return;
      plan[0].context_before = imported.context_before;
      plan[plan.length - 1].context_after = imported.context_after;
    },
  };
  window.addEventListener("message", (event) => {
    const data = event.data;
    if (event.origin !== PARENT || event.source !== window.parent || !data ||
        typeof data.channel !== "string" || !/^[a-f0-9]{48}$/.test(data.channel)) return;
    if (data.type === "ccrd-reader-init" && data.version === 1) {
      if (channel && channel !== data.channel) return;
      channel = data.channel;
      modal = data.modal === true;
      send("ccrd-reader-ready", { version: 1, max_characters: ReaderPlan.maxText });
      return;
    }
    if (!channel || data.channel !== channel) return;
    if (data.type === "ccrd-reader-import") {
      if (!validText(data.text, ReaderPlan.maxText) || !validText(data.title, 200, true) ||
          !validText(data.context_before, 32, true) || !validText(data.context_after, 32, true)) {
        send("ccrd-reader-rejected"); return;
      }
      const payload = { text: data.text, title: data.title, context_before: data.context_before, context_after: data.context_after };
      if (session) {
        // Native confirm() is restricted in cross-origin iframes in some
        // browsers. Keep this explicit user decision inside the visible UI.
        replacement = payload;
        confirmation.hidden = false;
        send("ccrd-reader-pending");
        return;
      }
      load(payload);
    } else if (data.type === "ccrd-reader-theme" && typeof data.dark === "boolean") {
      document.documentElement.style.colorScheme = data.dark ? "dark" : "light";
    } else if (data.type === "ccrd-reader-layout" && typeof data.modal === "boolean") {
      modal = data.modal;
    } else if (data.type === "ccrd-reader-focus" && modal && typeof data.last === "boolean") {
      const nodes = focusable();
      (data.last ? nodes[nodes.length - 1] : nodes[0])?.focus();
    } else if (data.type === "ccrd-reader-stop") {
      replacement = null;
      confirmation.hidden = true;
      stop({ message: "已停止，当前页面内可从进度继续" });
      send("ccrd-reader-stopped");
    }
  });
  document.addEventListener("keydown", (event) => {
    if (event.key === "Escape" && event.target.tagName !== "SELECT") {
      event.preventDefault(); send("ccrd-reader-collapse");
    }
    if (modal && event.key === "Tab") {
      const nodes = focusable();
      if ((!event.shiftKey && event.target === nodes[nodes.length - 1]) || (event.shiftKey && event.target === nodes[0])) {
        event.preventDefault(); send("ccrd-reader-focus-out", { reverse: event.shiftKey });
      }
    }
  });
  $("#speech-text").value = "";
  $("#remember").checked = false;
  title.textContent = "CCRD 朗读试点：请从搜索站载入选文或预览正文。仅在当前页面保留进度，不自动保存正文。";
})();