/**
 * Canonical frontend modal runtime.
 *
 * Owns the modal shell while adding cancellable loaders,
 * short in-memory caching, request deduplication, retryable errors, focus
 * restoration, and legacy `loaded.bs.modal` content lifecycle (auto_fun rescan).
 *
 * @package AKSRT
 */
(function (window, document) {
  "use strict";

  var ROOT_ID = "aksrt-modal-runtime-root";
  var active = null;
  var sequence = 0;
  var loaders = Object.create(null);

  function isMobile() {
    return window.matchMedia && window.matchMedia("(max-width: 768px)").matches;
  }

  function ensureRoot() {
    var root = document.getElementById(ROOT_ID);
    if (root) return root;
    root = document.createElement("div");
    root.id = ROOT_ID;
    root.className = "aksrt-modal-runtime-host";
    document.body.appendChild(root);
    return root;
  }

  function escapeHtml(value) {
    return String(value == null ? "" : value)
      .replace(/&/g, "&")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;")
      .replace(/\"/g, "&quot;")
      .replace(/'/g, "&#39;");
  }

  function lockScroll(lock) {
    document.documentElement.classList.toggle("aksrt-modal-runtime-open", !!lock);
    document.body.classList.toggle("aksrt-modal-runtime-open", !!lock);
  }

  function skeleton(options) {
    return (options && options.skeleton) ||
      '<div class="aksrt-modal-runtime__skeleton" aria-live="polite" aria-busy="true">' +
      '<span class="aksrt-modal-runtime__skeleton-line is-wide"></span>' +
      '<span class="aksrt-modal-runtime__skeleton-line"></span>' +
      '<span class="aksrt-modal-runtime__skeleton-line is-short"></span>' +
      '<span class="aksrt-modal-runtime__skeleton-block"></span>' +
      '</div>';
  }

  function telemetryStart(kind) {
    if (kind === false) return "";
    return window.AksrtModalTelemetry.start(kind || "generic");
  }

  function telemetryMark(session, event) {
    if (!session || !session.telemetryId) return;
    window.AksrtModalTelemetry.mark(session.telemetryId, event);
  }

  function setState(session, status, error) {
    session.state.status = status;
    session.state.error = error || null;
    session.state.updatedAt = Date.now();
    if (session.shell) session.shell.setAttribute("data-aksrt-modal-state", status);
    if (typeof session.options.onState === "function") {
      session.options.onState(status, session);
    }
  }

  function focusable(shell) {
    return shell.querySelectorAll("button:not([disabled]), [href], input:not([disabled]), select:not([disabled]), textarea:not([disabled]), [tabindex]:not([tabindex='-1'])");
  }

  function closeSelector() {
    return "[data-aksrt-modal-close], .aksrt-modal-runtime__close";
  }

  function bindChrome(session) {
    var shell = session.shell;
    shell.addEventListener("click", function (event) {
      var closeButton = event.target.closest(closeSelector());
      if (closeButton) {
        event.preventDefault();
        close("control");
        return;
      }
      if (event.target === shell || event.target.classList.contains("aksrt-modal-runtime__overlay")) {
        close("overlay");
        return;
      }
      var retry = event.target.closest("[data-aksrt-modal-retry]");
      if (retry) {
        event.preventDefault();
        refresh();
      }
    });

    shell.addEventListener("keydown", function (event) {
      if (event.key === "Escape") {
        event.preventDefault();
        close("escape");
        return;
      }
      if (event.key !== "Tab") return;
      var nodes = focusable(shell);
      if (!nodes.length) {
        event.preventDefault();
        shell.focus();
        return;
      }
      var first = nodes[0];
      var last = nodes[nodes.length - 1];
      if (event.shiftKey && document.activeElement === first) {
        event.preventDefault();
        last.focus();
      } else if (!event.shiftKey && document.activeElement === last) {
        event.preventDefault();
        first.focus();
      }
    });
  }

  function createSession(options) {
    options = options || {};
    var root = ensureRoot();
    var shell = document.createElement("div");
    var bottom = options.bottom === true || (options.mobileBottom !== false && isMobile());
    var heightStyle = options.height ? "min-height:" + parseInt(options.height, 10) + "px;" : "";
    var initialHtml = options.html !== undefined ? options.html : skeleton(options);
    var titleId = "aksrt-modal-title-" + String(sequence + 1);
    var titleHtml = options.title
      ? '<header class="aksrt-modal-runtime__header"><h3 class="aksrt-modal-runtime__title" id="' + titleId + '">' + escapeHtml(options.title) + '</h3><button type="button" class="aksrt-modal-runtime__close" data-aksrt-modal-close aria-label="关闭">&times;</button></header>'
      : "";

    shell.className =
      "aksrt-modal-runtime" +
      (bottom ? " aksrt-modal-runtime--bottom" : "") +
      (options.className ? " " + options.className : "");
    shell.setAttribute("role", "dialog");
    shell.setAttribute("aria-modal", "true");
    if (options.title) shell.setAttribute("aria-labelledby", titleId);
    shell.setAttribute("tabindex", "-1");
    shell.innerHTML =
      '<div class="aksrt-modal-runtime__overlay" data-aksrt-modal-close></div>' +
      '<div class="aksrt-modal-runtime__dialog" style="' + heightStyle + '">' +
      titleHtml +
      '<div class="aksrt-modal-runtime__content">' + initialHtml + "</div></div>";

    var session = {
      id: String(++sequence),
      shell: shell,
      content: shell.querySelector(".aksrt-modal-runtime__content"),
      options: options,
      state: window.AksrtModalState.create(options.kind || "generic"),
      focusReturn: document.activeElement,
      controller: null,
      flight: null,
      closed: false,
      telemetryId: telemetryStart(options.telemetry === false ? false : options.kind),
    };

    root.appendChild(shell);
    bindChrome(session);
    active = session;
    lockScroll(true);
    void shell.offsetWidth;
    shell.classList.add("is-open");
    setState(session, options.html !== undefined ? "ready" : "loading");
    telemetryMark(session, "shell");

    var nodes = focusable(shell);
    try {
      (nodes.length ? nodes[0] : shell).focus();
    } catch (error) {}

    document.dispatchEvent(new CustomEvent("aksrt:modal:open", {
      detail: { shell: shell, options: options, session: session },
    }));

    if (options.html !== undefined) {
      notifyContentLoaded(session);
      telemetryMark(session, "first-content");
      telemetryMark(session, "ready");
      if (typeof options.onContent === "function") options.onContent(options.html, session);
    }

    return session;
  }

  // legacy 契约：modal 内容注入后触发 loaded.bs.modal，
  // 由全局委托（见文件底部）驱动 auto_fun 重扫，不做模块内扫描。
  function notifyContentLoaded(session) {
    if (!session || !session.shell || !window.jQuery) return;
    window.jQuery(session.shell).trigger("loaded.bs.modal");
  }

  function abortSessionRequest(session) {
    if (!session) return;
    if (session.flight && typeof session.flight.release === "function") session.flight.release();
    session.flight = null;
    if (session.controller) {
      try { session.controller.abort(); } catch (error) {}
    }
    session.controller = null;
  }

  function close(reason, preserveRequest) {
    if (!active) return;
    var session = active;
    active = null;
    session.closed = true;
    if (!preserveRequest) abortSessionRequest(session);
    session.shell.classList.remove("is-open");
    if (!preserveRequest) lockScroll(false);
    document.dispatchEvent(new CustomEvent("aksrt:modal:close", {
      detail: { shell: session.shell, reason: reason || "close", session: session },
    }));

    var node = session.shell;
    window.setTimeout(function () {
      if (node && node.parentNode) node.parentNode.removeChild(node);
      var target = session.focusReturn;
      if (!preserveRequest && !active && target && target !== node && document.contains(target) && typeof target.focus === "function") {
        try { target.focus(); } catch (error) {}
      }
    }, 220);
  }

  function responseData(result) {
    if (!result) return null;
    if (result.data !== undefined && result.data !== null) return result.data;
    if (result.json && result.json.data !== undefined) return result.json.data;
    return result.json;
  }

  function responseHtml(result) {
    var data = responseData(result);
    if (data && typeof data.html === "string") return data.html;
    if (result && result.json && typeof result.json.html === "string") return result.json.html;
    return result && typeof result.text === "string" ? result.text : "";
  }

  function errorMessage(error) {
    if (error && error.code === "unauthorized") return "请先登录";
    return error && error.message ? String(error.message) : "加载失败，请重试";
  }

  function renderError(session, error) {
    if (!session || session.closed || active !== session) return;
    var unauthorized = error && error.code === "unauthorized";
    setState(session, unauthorized ? "unauthorized" : "error", error);
    telemetryMark(session, unauthorized ? "unauthorized" : "error");
    session.content.innerHTML =
      '<div class="aksrt-modal-runtime__error touch border-title"><b>提示</b></div>' +
      '<div class="aksrt-modal-runtime__error-body">' + escapeHtml(errorMessage(error)) +
      '</div><div class="but-average modal-buts">' +
      '<button type="button" class="but" data-aksrt-modal-retry>重试</button>' +
      '<button type="button" class="but" data-aksrt-modal-close>关闭</button></div>';
    notifyContentLoaded(session);
    if (typeof session.options.onError === "function") session.options.onError(error, session);
  }

  function renderResult(session, result) {
    if (!session || session.closed || active !== session) return;

    if (session.options.responseType === "json" || typeof session.options.renderData === "function") {
      var data = responseData(result);
      if (data === null || data === undefined) {
        setState(session, "empty");
        telemetryMark(session, "first-content");
        telemetryMark(session, "ready");
        session.content.innerHTML = '<div class="aksrt-modal-runtime__error-body">暂无内容</div>';
        return;
      }
      if (typeof session.options.renderData === "function") {
        session.options.renderData(data, session, result);
      }
      setState(session, "ready");
      telemetryMark(session, "first-content");
      notifyContentLoaded(session);
      telemetryMark(session, "ready");
      if (typeof session.options.onData === "function") session.options.onData(data, session, result);
      return;
    }

    var html = responseHtml(result);
    if (!html) {
      setState(session, "empty");
      telemetryMark(session, "first-content");
      telemetryMark(session, "ready");
      session.content.innerHTML = '<div class="aksrt-modal-runtime__error-body">暂无内容</div>';
      return;
    }
    session.content.innerHTML = html;
    setState(session, "ready");
    telemetryMark(session, "first-content");
    notifyContentLoaded(session);
    telemetryMark(session, "ready");
    if (typeof session.options.onContent === "function") session.options.onContent(html, session);
  }

  function load(session, loadOptions) {
    loadOptions = loadOptions || {};
    if (!session || session.closed || !session.options.url) return Promise.resolve(session && session.shell);
    abortSessionRequest(session);
    setState(session, "loading");
    session.content.innerHTML = skeleton(session.options);
    session.controller = window.AbortController ? new window.AbortController() : null;

    var requestOptions = {
      method: session.options.method || "GET",
      headers: session.options.headers || {},
      body: session.options.body,
      query: session.options.query,
      signal: session.controller ? session.controller.signal : undefined,
    };
    if (requestOptions.body === undefined) delete requestOptions.body;
    if (!requestOptions.signal) delete requestOptions.signal;

    var request = function () {
      return window.AksrtRequest.request(session.options.url, requestOptions);
    };

    var method = String(session.options.method || "GET").toUpperCase();
    var cacheable = method === "GET" && session.options.cache !== false;
    var cacheKey = session.options.cacheKey ||
      method + ":" + window.AksrtRequest.url(session.options.url, session.options.query);
    var cache = window.AksrtModalCache;
    var acquireOptions = {
      ttl: Number(session.options.cacheTtl || 15000),
      tags: session.options.cacheTags || session.options.tags || [],
      skipCache: !!loadOptions.force || !cacheable,
      store: cacheable,
      cancel: function () {
        if (session.controller) {
          try { session.controller.abort(); } catch (error) {}
        }
      },
    };

    var flight = cacheable
      ? cache.acquire(cacheKey, request, acquireOptions)
      : { promise: request(), release: function () {} };
    session.flight = flight;

    return flight.promise.then(function (result) {
      if (!session.closed && active === session) renderResult(session, result);
      return session.shell;
    }).catch(function (error) {
      var aborted = error && (error.name === "AbortError" || error.code === "ABORT_ERR");
      if (!aborted && !session.closed && active === session) renderError(session, error);
      return session.shell;
    }).then(function (shell) {
      // A refresh/replacement may have installed a newer flight on this session.
      // Only the owner of this promise may release and clear the slot.
      if (session.flight === flight) {
        if (flight && typeof flight.release === "function") flight.release();
        session.flight = null;
      }
      return shell;
    });
  }

  function open(options) {
    options = options || {};
    close("replace");
    var session = createSession(options);
    return session.shell;
  }

  function sessionKey(options) {
    if (!options || !options.url) return "";
    var method = String(options.method || "GET").toUpperCase();
    var requestUrl = window.AksrtRequest.url(options.url, options.query);
    return method + ":" + requestUrl;
  }

  function openRemote(options) {
    options = Object.assign({}, options || {});
    if (!options.url) return Promise.reject(new Error("missing url"));
    var sameRequest = active && active.flight && sessionKey(active.options) === sessionKey(options);
    close("replace", !!sameRequest);
    var session = createSession(options);
    return load(session).then(function () { return session.shell; });
  }

  function refresh(options) {
    if (!active || !active.options.url) return Promise.resolve(null);
    if (options && typeof options === "object") active.options = Object.assign({}, active.options, options);
    return load(active, { force: true });
  }

  function registerLoader(kind, loader) {
    if (!kind || typeof loader !== "function") return;
    loaders[String(kind)] = loader;
  }

  function openLoader(kind, context) {
    var loader = loaders[String(kind)];
    if (!loader) return Promise.reject(new Error("missing modal loader: " + kind));
    return openRemote(loader(context || {}));
  }

  function invalidate(tags) {
    return window.AksrtModalCache.invalidate(tags);
  }

  window.AksrtModalRuntime = {
    open: open,
    openRemote: openRemote,
    close: close,
    refresh: refresh,
    registerLoader: registerLoader,
    openLoader: openLoader,
    invalidate: invalidate,
    getActive: function () { return active ? active.shell : null; },
    getState: function () { return active ? active.state : null; },
  };

  document.dispatchEvent(new CustomEvent("aksrt:modal-runtime:ready"));

  // legacy 契约（只绑定一次）：modal 展示/内容注入后调用全局 auto_fun 重扫。
  if (window.jQuery) {
    window.jQuery(document).on(
      "loaded.bs.modal show.bs.modal",
      ".modal, .aksrt-modal-runtime",
      function () {
        if (typeof window.auto_fun === "function") window.auto_fun();
      }
    );
  }
})(window, document);