// The client log's app-wide hooks, installed once from main.tsx before anything renders:
// the start snapshot, uncaught errors and rejections, navigation, connectivity, and — only while the
// user's consented level is raised — which control was used and what the tab itself went
// through (hidden/shown, restored from the back-forward cache, resized).
//
// Navigation has no single choke point in this router-free app — `setPage`, the channel and search
// overlays, sub-views, the overlay stack and the URL mirrors each call `history.pushState` /
// `replaceState` themselves (lib/history.ts, NavigationProvider, ChannelsProvider, …). Instrumenting
// each would be one more thing a new call site can forget, so the History methods themselves are
// wrapped here, and `popstate` covers Back/Forward. A replaceState that only saves a scroll position
// changes nothing this logs, so it is not an event.
import { FRONTEND_SHA, FRONTEND_VERSION } from "./version";
import { enabled, errorAttrs, log } from "./log";
import { pathTemplate } from "./http";

// URL parameters that carry what the user TYPED — a search, a column's text filter. Logged only at
// TRACE ("Teljes"). Every other parameter is filter/sort/view state: its NAME is kept at INFO, its
// value at DEBUG. The shell has none; each page's join at install (ModuleDef.typedUrlKeys).
const TYPED_PARAMS = new Set<string>();

type Via = "start" | "push" | "replace" | "pop";

/** What a navigation event records of where the tab is now. Built from `history.state`'s own view
 *  keys and the query, never the full URL (a `#reset=` fragment, a `?token=` link). */
function viewAttrs(): Record<string, unknown> {
  const st = (window.history.state ?? {}) as Record<string, unknown>;
  const params = new URLSearchParams(window.location.search);
  const view: Record<string, unknown> = {
    path: pathTemplate(window.location.pathname),
    page: typeof st.sfPage === "string" ? st.sfPage : null,
    params: [...new Set(params.keys())].sort(),
    overlay: st._ov != null,
    channel: st._chan != null,
    search: st._yt != null,
  };
  if (enabled("DEBUG")) {
    const values: Record<string, string> = {};
    for (const [k, v] of params) {
      if (!TYPED_PARAMS.has(k) || enabled("TRACE")) values[k] = v;
    }
    view.values = values;
    if (typeof st._sub === "string") view.sub = st._sub;
  }
  if (enabled("TRACE") && typeof st._yt === "string") view.query = st._yt;
  return view;
}

/** A script's path (`/assets/index-B1x9.js`): the bundle name is what finds the fault, and a script
 *  URL carries no user data — but a malformed one is dropped rather than logged raw. */
function scriptPath(filename: string): string {
  try {
    return new URL(filename, window.location.href).pathname;
  } catch {
    return "?";
  }
}

let lastView = "";
function recordView(via: Via): void {
  const view = viewAttrs();
  const signature = JSON.stringify(view);
  if (via !== "start" && signature === lastView) return;
  lastView = signature;
  log.info("nav.view", `${via} ${String(view.page ?? view.path)}`, { via, ...view });
}

// What counts as a control for click capture: anything a user operates.
const CONTROL = [
  "button",
  "a[href]",
  "input",
  "select",
  "textarea",
  "summary",
  ...[
    "button",
    "link",
    "tab",
    "menuitem",
    "menuitemradio",
    "menuitemcheckbox",
    "option",
    "switch",
    "checkbox",
    "radio",
  ].map((role) => `[role="${role}"]`),
].join(", ");
const ARIA_STATE = ["aria-pressed", "aria-checked", "aria-expanded", "aria-selected"] as const;

type AppCopy = (text: string | null) => string | null;

/** Which control this is — never what it says, unless what it says is the app's own copy.
 *  Recorded: its test id (its own, else the nearest enclosing one as `within`), its lucide icon, the
 *  English wording of its aria-label/text/title when that is exactly app copy (`appCopy`), its tag,
 *  role and input type, its aria state, whether a checkbox is checked, and for a link the path
 *  TEMPLATE or just "external". Never: an input's value, free label text, an href's query. */
function controlAttrs(el: Element, appCopy: AppCopy): Record<string, unknown> {
  const attrs: Record<string, unknown> = { tag: el.tagName.toLowerCase() };
  const role = el.getAttribute("role");
  if (role) attrs.role = role;
  const testId = el.getAttribute("data-testid");
  if (testId) attrs.control = testId;
  else {
    const within = el.parentElement?.closest("[data-testid]")?.getAttribute("data-testid");
    if (within) attrs.within = within;
  }
  const icon = [...(el.querySelector("svg.lucide")?.classList ?? [])].find(
    (c) => c.startsWith("lucide-") && c !== "lucide-icon",
  );
  if (icon) attrs.icon = icon.slice("lucide-".length);
  const label =
    appCopy(el.getAttribute("aria-label")) ??
    appCopy(el.textContent) ??
    appCopy(el.getAttribute("title"));
  if (label) attrs.label = label;
  if (el instanceof HTMLInputElement) {
    attrs.type = el.type;
    if (el.type === "checkbox" || el.type === "radio") attrs.checked = el.checked;
  }
  for (const name of ARIA_STATE) {
    const value = el.getAttribute(name);
    if (value !== null) attrs[name.slice("aria-".length)] = value;
  }
  if (el instanceof HTMLAnchorElement) {
    attrs.href = el.origin === window.location.origin ? pathTemplate(el.pathname) : "external";
  }
  const page = (window.history.state as Record<string, unknown> | null)?.sfPage;
  if (typeof page === "string") attrs.page = page;
  return attrs;
}

function installDetailHooks(appCopy: AppCopy): void {
  // Capture phase, so a handler that stops propagation cannot hide the click from the log.
  document.addEventListener(
    "click",
    (e) => {
      if (!enabled("DEBUG") || !(e.target instanceof Element)) return;
      const control = e.target.closest(CONTROL);
      if (!control) return;
      const attrs = controlAttrs(control, appCopy);
      const name = attrs.control ?? attrs.label ?? attrs.icon ?? attrs.within ?? attrs.tag;
      log.debug("ui.click", `click ${String(name)}`, attrs);
    },
    true,
  );
  document.addEventListener("visibilitychange", () => {
    log.debug("app.visibility", document.visibilityState, { state: document.visibilityState });
  });
  window.addEventListener("pageshow", (e) => {
    if (e.persisted) log.debug("app.restored", "restored from the back-forward cache");
  });
  let resizeTimer: number | null = null;
  window.addEventListener("resize", () => {
    if (!enabled("DEBUG")) return;
    if (resizeTimer !== null) window.clearTimeout(resizeTimer);
    resizeTimer = window.setTimeout(() => {
      resizeTimer = null;
      const viewport = `${window.innerWidth}x${window.innerHeight}`;
      log.debug("app.resize", viewport, { viewport });
    }, 500);
  });
  // Connectivity is worth a line at the base level: it explains a burst of failed requests.
  window.addEventListener("offline", () => log.warn("app.network", "offline", { online: false }));
  window.addEventListener("online", () => log.info("app.network", "online", { online: true }));
}

let installed = false;

/** Install the hooks. Idempotent: a second call (a hot reload) must not wrap History twice.
 *  `appCopy` turns on-screen app copy into its English wording (i18n/appCopy.ts) — passed in, so this
 *  module stays free of the i18n runtime. */
export function installClientLog(
  appCopy: AppCopy = () => null,
  typedParams: readonly string[] = [],
): void {
  if (installed) return;
  installed = true;
  for (const k of typedParams) TYPED_PARAMS.add(k);

  log.info("app.start", "app loaded", {
    version: FRONTEND_VERSION,
    sha: FRONTEND_SHA,
    user_agent: navigator.userAgent,
    language: navigator.language,
    viewport: `${window.innerWidth}x${window.innerHeight}`,
    dpr: window.devicePixelRatio,
  });

  window.addEventListener("error", (e) => {
    // A failed <img>/<script> load also dispatches `error` on window (capture only); those carry no
    // `error` object and are not script faults.
    if (!(e instanceof ErrorEvent)) return;
    log.error("app.uncaught", e.message || "uncaught error", {
      ...errorAttrs(e.error ?? e.message),
      where: e.filename ? `${scriptPath(e.filename)}:${e.lineno}:${e.colno}` : null,
    });
  });
  window.addEventListener("unhandledrejection", (e) => {
    log.error("app.unhandled_rejection", "unhandled promise rejection", errorAttrs(e.reason));
  });

  const history = window.history;
  for (const [method, via] of [
    ["pushState", "push"],
    ["replaceState", "replace"],
  ] as const) {
    const original = history[method];
    history[method] = function (this: History, ...args: Parameters<History["pushState"]>) {
      original.apply(this, args);
      recordView(via);
    };
  }
  window.addEventListener("popstate", () => recordView("pop"));
  recordView("start");
  installDetailHooks(appCopy);
}