"""Browser recorder for Inspector-owned Playwright sessions.

Injects capture-phase listeners that do NOT preventDefault / stopPropagation
and do NOT mutate business DOM. Re-attaches after navigation.
"""

from __future__ import annotations

import json
import queue
import threading
import time
from typing import Any, Callable, Optional

from .base import RawUserEvent, RecorderBase, RecorderState

_LISTEN_SCRIPT = r"""
(() => {
  if (window.__openclawUiInspectorRecorderInstalled) return;
  window.__openclawUiInspectorRecorderInstalled = true;
  window.__openclawUiInspectorEvents = window.__openclawUiInspectorEvents || [];
  window.__openclawUiInspectorDocId = window.__openclawUiInspectorDocId ||
    (Date.now().toString(36) + "-" + Math.random().toString(36).slice(2));
  window.__openclawUiInspectorSeq = window.__openclawUiInspectorSeq || 0;

  function cssPath(el) {
    if (!el || !el.tagName) return "";
    const esc = (value) => {
      try { return CSS.escape(String(value)); } catch (e) { return String(value).replace(/[^a-zA-Z0-9_-]/g, "\\$&"); }
    };
    const parts = [];
    let cur = el;
    for (let i = 0; cur && i < 12; i++) {
      let part = cur.tagName.toLowerCase();
      if (cur.id) { part += "#" + esc(cur.id); parts.unshift(part); break; }
      const cls = (cur.className && typeof cur.className === "string")
        ? cur.className.trim().split(/\s+/).slice(0, 3).map(esc).join(".")
        : "";
      if (cls) part += "." + cls;
      parts.unshift(part);
      cur = cur.parentElement;
    }
    return parts.join(" > ");
  }

  function stableCss(el) {
    if (!el || !el.getAttribute) return "";
    const quote = (value) => JSON.stringify(String(value));
    const ownId = el.id || "";
    if (ownId) return "#" + CSS.escape(ownId);
    const testId = el.getAttribute("data-testid") || "";
    if (testId) return `[data-testid=${quote(testId)}]`;
    const tag = (el.tagName || "").toLowerCase();
    let leaf = "";
    const href = el.getAttribute("href") || "";
    if (tag === "a" && href) leaf = `a[href=${quote(href)}]`;
    else if (el.getAttribute("contenteditable") != null) leaf = `${tag || "*"}[contenteditable]`;
    else if (el.getAttribute("name")) leaf = `${tag || "*"}[name=${quote(el.getAttribute("name"))}]`;
    else if (el.getAttribute("aria-label")) leaf = `${tag || "*"}[aria-label=${quote(el.getAttribute("aria-label"))}]`;
    else if (el.getAttribute("placeholder")) leaf = `${tag || "*"}[placeholder=${quote(el.getAttribute("placeholder"))}]`;
    const stableClasses = (node) => {
      if (!node || typeof node.className !== "string") return [];
      return node.className.trim().split(/\s+/).filter((token) => {
        if (!token || token.length < 4 || token.length > 64) return false;
        const lower = token.toLowerCase();
        const semantic = /(button|btn|input|editor|control|action|submit|send|publish|post|play|pause|menu|option|tab|dialog|form|toolbar|container)/.test(lower);
        const structured = /[-_]/.test(token) && !/^[a-z0-9_-]{6,14}$/i.test(token);
        return semantic || structured;
      }).slice(0, 2);
    };
    if (!leaf) {
      const classes = stableClasses(el);
      leaf = tag + classes.map(cls => "." + CSS.escape(cls)).join("");
    }
    let cur = el.parentElement;
    const relative = [leaf];
    for (let i = 0; cur && i < 10; i++, cur = cur.parentElement) {
      if (cur.id) return `#${CSS.escape(cur.id)} > ${relative.reverse().join(" > ")}`;
      const ancestorTestId = cur.getAttribute?.("data-testid") || "";
      if (ancestorTestId) return `[data-testid=${quote(ancestorTestId)}] > ${relative.reverse().join(" > ")}`;
      const curTag = (cur.tagName || "").toLowerCase();
      const classes = stableClasses(cur);
      relative.push(curTag + classes.map(cls => "." + CSS.escape(cls)).join(""));
    }
    return "";
  }

  function editableValue(el) {
    if (!el) return "";
    if (el.value != null) return String(el.value);
    if (el.isContentEditable || el.getAttribute?.("contenteditable") != null) {
      return String(el.innerText != null ? el.innerText : (el.textContent || ""));
    }
    return "";
  }

  function isEditable(el) {
    if (!el || !el.getAttribute) return false;
    const tag = (el.tagName || "").toLowerCase();
    return tag === "input" || tag === "textarea" || tag === "select" ||
      !!el.isContentEditable || el.getAttribute("contenteditable") != null;
  }

  function editableRoot(el) {
    let cur = el;
    for (let i = 0; cur && i < 12; i++) {
      if (cur.getAttribute && cur.getAttribute("contenteditable") != null) return cur;
      const tag = (cur.tagName || "").toLowerCase();
      if (tag === "input" || tag === "textarea" || tag === "select") return cur;
      cur = cur.parentElement;
    }
    return null;
  }

  function semanticRole(el) {
    if (!el || !el.getAttribute) return "";
    const explicit = el.getAttribute("role");
    if (explicit) return explicit;
    const tag = (el.tagName || "").toLowerCase();
    if (el.isContentEditable) return "textbox";
    if (tag === "a") return "link";
    if (tag === "textarea") return "textbox";
    if (tag === "select") return "combobox";
    if (tag === "input") {
      const type = (el.type || "text").toLowerCase();
      if (type === "checkbox") return "checkbox";
      if (type === "radio") return "radio";
      if (["button", "submit", "reset"].includes(type)) return "button";
      return "textbox";
    }
    return tag;
  }

  function actionableFromEvent(ev) {
    const path = (ev && typeof ev.composedPath === "function") ? ev.composedPath() : [];
    const nodes = path.length ? path : [ev && ev.target];
    let best = ev && ev.target;
    let bestScore = -1;
    for (const el of nodes) {
      if (!el || !el.matches) continue;
      const tag = (el.tagName || "").toLowerCase();
      const role = (el.getAttribute("role") || "").toLowerCase();
      const cls = typeof el.className === "string" ? el.className.toLowerCase() : "";
      let cursor = "";
      try { cursor = getComputedStyle(el).cursor || ""; } catch (e) {}
      let score = 0;
      if (el.matches("button,a,input,textarea,select,summary,label")) score = 100;
      if (el.isContentEditable || el.getAttribute("contenteditable") != null) score = 98;
      if (["button","link","textbox","combobox","checkbox","radio","menuitem","option","tab"].includes(role)) score = Math.max(score, 96);
      else if (role) score = Math.max(score, 52);
      if (el.getAttribute("data-testid") || el.getAttribute("aria-label")) score = Math.max(score, 90);
      if (el.getAttribute("tabindex") != null) score = Math.max(score, 74);
      if (cursor === "pointer") score = Math.max(score, 68);
      // Many production apps use camelCase classes such as sendControl or
      // playButton.  Prefer that actionable wrapper over its inherited-cursor
      // SVG/path child while still retaining hit_target for diagnostics.
      if (tag.includes("-") || /(button|btn|submit|send|play|control|action|click)/i.test(cls)) score = Math.max(score, 72);
      if (score > bestScore) { best = el; bestScore = score; }
    }
    return best;
  }

  function snap(el) {
    if (!el || !el.getAttribute) return {};
    const role = semanticRole(el);
    let cursor = "";
    let rect = {};
    try {
      cursor = getComputedStyle(el).cursor || "";
      const r = el.getBoundingClientRect();
      rect = {left:r.left, top:r.top, right:r.right, bottom:r.bottom, width:r.width, height:r.height};
    } catch (e) {}
    const tag = el.tagName ? el.tagName.toLowerCase() : "";
    const css = cssPath(el);
    const stable = stableCss(el);
    let cssCount = null;
    let stableCssCount = null;
    try { cssCount = css ? document.querySelectorAll(css).length : null; } catch (e) {}
    try { stableCssCount = stable ? document.querySelectorAll(stable).length : null; } catch (e) {}
    const href = el.getAttribute("href") || "";
    let hrefCount = null;
    try {
      hrefCount = href ? Array.from(document.querySelectorAll("a[href]")).filter(
        node => node.getAttribute("href") === href
      ).length : null;
    } catch (e) {}
    const roleNames = ["button","link","textbox","combobox","checkbox","radio","menuitem","option","tab"];
    return {
      role: role,
      explicit_role: el.getAttribute("role") || "",
      aria_label: el.getAttribute("aria-label") || "",
      name: el.getAttribute("aria-label") || el.name || el.id ||
        ((el.matches?.("button,a,[role],label,summary") || roleNames.includes(role) || cursor === "pointer" || tag.includes("-"))
          ? (el.innerText || el.textContent || "").trim().slice(0, 120) : ""),
      text: (el.innerText || el.textContent || "").trim().slice(0, 120),
      value: editableValue(el).slice(0, 500),
      test_id: el.getAttribute("data-testid") || "",
      name_attr: el.getAttribute("name") || "",
      href: href,
      href_count: hrefCount,
      title: el.getAttribute("title") || "",
      alt: el.getAttribute("alt") || "",
      id: el.id || "",
      placeholder: el.getAttribute("placeholder") || el.getAttribute("aria-placeholder") || "",
      label: "",
      input_type: (el.type || "").toLowerCase(),
      tag: tag,
      class_name: (typeof el.className === "string" ? el.className : "").slice(0, 300),
      cursor: cursor,
      rect: rect,
      disabled: !!el.disabled || el.getAttribute("aria-disabled") === "true",
      contenteditable: !!el.isContentEditable || el.getAttribute("contenteditable") != null,
      contenteditable_attr: el.getAttribute("contenteditable") != null,
      tabindex: el.getAttribute("tabindex"),
      css: css,
      css_count: cssCount,
      stable_css: stable,
      stable_css_count: stableCssCount,
      fingerprint: [
        el.tagName?.toLowerCase() || "", el.id || "",
        el.getAttribute("data-testid") || "", el.getAttribute("name") || "",
        css
      ].join("|"),
    };
  }

  function ancestry(el) {
    const out = [];
    let cur = el;
    for (let i = 0; cur && i < 12; i++) {
      out.push(snap(cur));
      cur = cur.parentElement;
    }
    return out;
  }

  function push(kind, payload) {
    try {
      const item = Object.assign({
        event_id: window.__openclawUiInspectorDocId + ":" + (++window.__openclawUiInspectorSeq),
        document_id: window.__openclawUiInspectorDocId,
        sequence: window.__openclawUiInspectorSeq,
        kind: kind,
        ts: Date.now(),
        url: location.href,
        title: document.title,
        frame_url: location.href,
        frame_name: window.name || "",
      }, payload || {});
      window.__openclawUiInspectorEvents.push(item);
      if (typeof window.__openclawUiInspectorEmit === "function") {
        try { window.__openclawUiInspectorEmit(item); } catch (e) {}
      }
      if (window.__openclawUiInspectorEvents.length > 200) {
        window.__openclawUiInspectorEvents.splice(0, 50);
      }
    } catch (e) {}
  }

  document.addEventListener("click", (ev) => {
    const hit = ev.target;
    const action = actionableFromEvent(ev) || hit;
    push("click", {
      target: snap(action),
      hit_target: snap(hit),
      action_target: snap(action),
      ancestry: ancestry(hit),
      candidate_chain: ancestry(hit),
      button: ev.button,
      x: ev.clientX,
      y: ev.clientY
    });
  }, true);

  document.addEventListener("pointerdown", (ev) => {
    const hit = ev.target;
    push("pointerdown", {
      target: snap(hit),
      hit_target: snap(hit),
      candidate_chain: ancestry(hit),
      button: ev.button,
      pointer_id: ev.pointerId,
      pointer_type: ev.pointerType || "",
      x: ev.clientX,
      y: ev.clientY
    });
  }, true);

  document.addEventListener("input", (ev) => {
    if (ev.isComposing) return;
    const t = editableRoot(ev.target) || actionableFromEvent(ev) || ev.target;
    push("input", {
      target: snap(t), text: editableValue(t), input_event: ev.inputType || "input",
      candidate_chain: ancestry(ev.target), is_trusted: !!ev.isTrusted
    });
  }, true);

  document.addEventListener("change", (ev) => {
    const t = editableRoot(ev.target) || actionableFromEvent(ev) || ev.target;
    push("input", { target: snap(t), text: editableValue(t), input_event: "change",
      candidate_chain: ancestry(ev.target), is_trusted: !!ev.isTrusted });
  }, true);

  document.addEventListener("compositionend", (ev) => {
    const t = editableRoot(ev.target) || actionableFromEvent(ev) || ev.target;
    push("input", {
      target: snap(t), text: editableValue(t), input_event: "compositionend",
      candidate_chain: ancestry(ev.target), is_trusted: !!ev.isTrusted
    });
  }, true);

  document.addEventListener("paste", (ev) => {
    const t = editableRoot(ev.target) || actionableFromEvent(ev) || ev.target;
    setTimeout(() => push("input", {
      target: snap(t), text: editableValue(t), input_event: "paste",
      candidate_chain: ancestry(ev.target), is_trusted: !!ev.isTrusted
    }), 0);
  }, true);

  document.addEventListener("keydown", (ev) => {
    const special = ["Enter","Escape","Tab","Backspace","Delete"];
    const editing = isEditable(ev.target);
    const mutatingEditKey = editing && (ev.key === "Backspace" || ev.key === "Delete");
    if (!mutatingEditKey && (special.indexOf(ev.key) >= 0 || (ev.key && ev.key.length > 1))) {
      const t = actionableFromEvent(ev) || ev.target;
      push("key", { key: ev.key, target: snap(t) });
    }
  }, true);
})();
"""


class BrowserRecorder(RecorderBase):
    capability_map = {
        "click": "implemented",
        "fill": "implemented",
        "press_key": "implemented",
        "navigation": "partial",
    }

    def __init__(
        self,
        *,
        on_event: Optional[Callable[[RawUserEvent], None]] = None,
        on_raw_event: Optional[Callable[[dict[str, Any]], None]] = None,
        poll_sec: float = 0.25,
    ) -> None:
        super().__init__(on_event=on_event)
        self.on_raw_event = on_raw_event
        self.poll_sec = poll_sec
        self._last_url = ""
        self._last_urls_by_page: dict[str, str] = {}
        self._installed_pages: set[int] = set()
        self._bound_events: queue.Queue[dict[str, Any]] = queue.Queue(maxsize=512)
        self._seen_event_ids: set[str] = set()
        self._seen_event_order: list[str] = []
        self._known_page_ids: set[str] = set()
        self._pending_navigations: dict[str, dict[str, Any]] = {}
        self._pending_pointerdowns: dict[str, dict[str, Any]] = {}
        self._navigation_reorder_sec = 0.45
        self._pointer_fallback_sec = 0.35

    @property
    def capability(self) -> dict[str, str]:
        return dict(self.capability_map)

    def start(self) -> None:
        if self._thread and self._thread.is_alive():
            self.status = RecorderState.RECORDING
            return
        self._stop.clear()
        self.status = RecorderState.RECORDING
        try:
            import kit_browser

            kit_browser.install_event_bridge(_LISTEN_SCRIPT, self._receive_bound_event)
            initial_ids = kit_browser.call_on_each_open_page(
                lambda page: kit_browser.page_id_for(page)
            )
            self._known_page_ids.update(
                str(page_id) for page_id in initial_ids if page_id
            )
        except Exception:
            # Polling remains as a compatibility fallback.
            pass
        self._thread = threading.Thread(
            target=self._loop, name="ui-inspector-browser-recorder", daemon=True
        )
        self._thread.start()

    def stop(self) -> None:
        self._stop.set()
        if self._thread and self._thread.is_alive():
            self._thread.join(timeout=2.0)
        self._thread = None
        # Disable the bridge before draining its local queue so an event that
        # arrived just before Stop is not silently lost, while no new events
        # can race with the drain.
        try:
            import kit_browser

            kit_browser.clear_event_bridge()
        except Exception:
            pass
        if self.status == RecorderState.RECORDING:
            try:
                self._drain_bound_events()
                self._flush_pending_pointerdowns(force=True)
                self._flush_pending_navigations(force=True)
            except Exception:
                pass
        self.status = RecorderState.STOPPED

    def _receive_bound_event(self, event: dict[str, Any]) -> None:
        try:
            self._bound_events.put_nowait(dict(event or {}))
        except queue.Full:
            try:
                self._bound_events.get_nowait()
                self._bound_events.put_nowait(dict(event or {}))
            except (queue.Empty, queue.Full):
                pass

    def _loop(self) -> None:
        while not self._stop.is_set():
            if self.status == RecorderState.PAUSED:
                time.sleep(0.1)
                continue
            if self.status != RecorderState.RECORDING:
                time.sleep(0.05)
                continue
            try:
                self._tick()
            except Exception:
                pass
            time.sleep(self.poll_sec)

    def _tick(self) -> None:
        import kit_browser

        self._drain_bound_events()

        # Install + drain on every open tab (detail may be a second tab).
        payloads = kit_browser.call_on_each_open_page(self._install_and_drain)
        if payloads:
            for payload in payloads:
                if not isinstance(payload, dict):
                    continue
                page_id = str(payload.get("page_id") or "")
                url = str(payload.get("url") or "")
                previous_url = self._last_urls_by_page.get(page_id, "") if page_id else ""
                if previous_url and url and url != previous_url:
                    self._schedule_navigation(
                        page_id=page_id, from_url=previous_url, to_url=url
                    )
                elif (
                    page_id
                    and page_id not in self._known_page_ids
                    and self._known_page_ids
                    and url
                    and not url.startswith("about:")
                ):
                    opener_id = str(payload.get("opener_page_id") or "")
                    self._schedule_navigation(
                        page_id=page_id,
                        from_url=self._last_urls_by_page.get(opener_id, ""),
                        to_url=url,
                        opener_page_id=opener_id,
                        new_page=True,
                    )
                if page_id and url:
                    self._last_urls_by_page[page_id] = url
                    self._known_page_ids.add(page_id)
                for ev in payload.get("events") or []:
                    if isinstance(ev, dict) and not ev.get("page_id"):
                        ev["page_id"] = payload.get("page_id") or ""
                    self._emit_dom_event(ev)

        self._flush_pending_pointerdowns()

        # Navigation is intentionally emitted after both bridge and polling
        # queues have been drained.  This preserves click -> navigation order
        # even when the context bridge is unavailable and polling is used.
        self._flush_pending_navigations()

    def _drain_bound_events(self) -> None:
        while True:
            try:
                self._emit_dom_event(self._bound_events.get_nowait())
            except queue.Empty:
                break

    def _schedule_navigation(
        self,
        *,
        page_id: str,
        from_url: str,
        to_url: str,
        opener_page_id: str = "",
        new_page: bool = False,
    ) -> None:
        self._pending_navigations[page_id] = {
            "due": time.monotonic() + self._navigation_reorder_sec,
            "from": from_url,
            "to": to_url,
            "page_id": page_id,
            "opener_page_id": opener_page_id,
            "new_page": new_page,
        }

    def _flush_pending_navigations(self, *, force: bool = False) -> None:
        now = time.monotonic()
        ready = [
            page_id
            for page_id, item in self._pending_navigations.items()
            if force or float(item.get("due") or 0.0) <= now
        ]
        for page_id in ready:
            self._flush_pending_pointerdowns(force=True, page_id=page_id)
            item = self._pending_navigations.pop(page_id, None) or {}
            self.emit(
                RawUserEvent(
                    kind="navigation",
                    surface="browser",
                    url=str(item.get("to") or ""),
                    meta={
                        "from": item.get("from") or "",
                        "to": item.get("to") or "",
                        "page_id": page_id,
                        "opener_page_id": item.get("opener_page_id") or "",
                        "new_page": bool(item.get("new_page")),
                    },
                )
            )

    def _install_and_drain(self, page: Any) -> dict[str, Any]:
        """Runs on Playwright worker thread (once per open tab)."""
        try:
            page.evaluate(_LISTEN_SCRIPT)
        except Exception:
            pass
        # Also try frames
        try:
            for frame in page.frames:
                try:
                    frame.evaluate(_LISTEN_SCRIPT)
                except Exception:
                    pass
        except Exception:
            pass
        events = []
        try:
            events = page.evaluate(
                """() => {
                  const e = window.__openclawUiInspectorEvents || [];
                  window.__openclawUiInspectorEvents = [];
                  return e;
                }"""
            ) or []
        except Exception:
            events = []
        url = ""
        try:
            url = page.url or ""
        except Exception:
            url = ""
        page_id = ""
        opener_page_id = ""
        try:
            import kit_browser

            page_id = kit_browser.page_id_for(page)
            try:
                opener = page.opener()
                if opener is not None:
                    opener_page_id = kit_browser.page_id_for(opener)
            except Exception:
                pass
        except Exception:
            pass
        return {
            "url": url,
            "page_id": page_id,
            "opener_page_id": opener_page_id,
            "events": events,
        }

    def _emit_dom_event(self, ev: dict[str, Any]) -> None:
        event_id = str(ev.get("event_id") or "")
        if event_id:
            if event_id in self._seen_event_ids:
                return
            self._seen_event_ids.add(event_id)
            self._seen_event_order.append(event_id)
            if len(self._seen_event_order) > 2000:
                old = self._seen_event_order.pop(0)
                self._seen_event_ids.discard(old)
        if self.on_raw_event:
            try:
                self.on_raw_event(dict(ev))
            except Exception:
                pass
        kind = str(ev.get("kind") or "")
        hit_target = dict(ev.get("hit_target") or ev.get("target") or {})
        candidate_chain = list(ev.get("candidate_chain") or ev.get("ancestry") or [])
        if not candidate_chain:
            candidate_chain = [hit_target]
            action_hint = dict(ev.get("action_target") or {})
            if action_hint and action_hint != hit_target:
                candidate_chain.append(action_hint)
        try:
            from core.policies.target_scoring import resolve_browser_target

            target, target_scores = resolve_browser_target(
                hit_target,
                candidate_chain,
                x=int(ev.get("x")) if ev.get("x") is not None else None,
                y=int(ev.get("y")) if ev.get("y") is not None else None,
            )
        except Exception:
            target = dict(ev.get("action_target") or ev.get("target") or hit_target)
            target_scores = []
        if candidate_chain:
            target["parent_chain"] = candidate_chain
        frame = {
            "url": ev.get("frame_url") or "",
            "name": ev.get("frame_name") or "",
            "id": ev.get("frame_id") or "",
        }
        if kind in {"pointerdown", "click"}:
            raw = RawUserEvent(
                    kind="click",
                    surface="browser",
                    target=target,
                    frame=frame,
                    url=str(ev.get("url") or ""),
                    x=int(ev.get("x")) if ev.get("x") is not None else None,
                    y=int(ev.get("y")) if ev.get("y") is not None else None,
                    meta={
                        "button": ev.get("button"),
                        "event_id": event_id,
                        "document_id": ev.get("document_id"),
                        "page_id": ev.get("page_id"),
                        "frame_id": ev.get("frame_id"),
                        "sequence": ev.get("sequence"),
                        "source_ts_ms": ev.get("ts"),
                        "hit_target": ev.get("hit_target") or {},
                        "action_target": ev.get("action_target") or target,
                        "target_scores": target_scores,
                        "captured_from": kind,
                    },
                )
            if kind == "pointerdown":
                key = self._pointer_key(ev)
                self._pending_pointerdowns[key] = {
                    "due": time.monotonic() + self._pointer_fallback_sec,
                    "event": raw,
                    "page_id": str(ev.get("page_id") or ""),
                }
                return
            self._cancel_pointerdown_for_click(ev)
            self.emit(raw)
        elif kind == "input":
            self.emit(
                RawUserEvent(
                    kind="input",
                    surface="browser",
                    text=str(ev.get("text") or target.get("value") or ""),
                    target=target,
                    frame=frame,
                    url=str(ev.get("url") or ""),
                    meta={
                        "input_type": target.get("input_type") or "",
                        "event_id": event_id,
                        "document_id": ev.get("document_id"),
                        "page_id": ev.get("page_id"),
                        "frame_id": ev.get("frame_id"),
                        "sequence": ev.get("sequence"),
                        "source_ts_ms": ev.get("ts"),
                        "input_event": ev.get("input_event") or "input",
                        "is_trusted": bool(ev.get("is_trusted")),
                    },
                )
            )
        elif kind == "key":
            self.emit(
                RawUserEvent(
                    kind="key",
                    surface="browser",
                    key=str(ev.get("key") or ""),
                    target=target,
                    frame=frame,
                    url=str(ev.get("url") or ""),
                    meta={
                        "event_id": event_id,
                        "document_id": ev.get("document_id"),
                        "page_id": ev.get("page_id"),
                        "frame_id": ev.get("frame_id"),
                        "sequence": ev.get("sequence"),
                        "source_ts_ms": ev.get("ts"),
                    },
                )
            )

    @staticmethod
    def _pointer_key(ev: dict[str, Any]) -> str:
        return "|".join(
            str(ev.get(key) or "")
            for key in ("page_id", "document_id", "pointer_id", "button")
        )

    def _cancel_pointerdown_for_click(self, ev: dict[str, Any]) -> None:
        exact = self._pointer_key(ev)
        if exact in self._pending_pointerdowns:
            self._pending_pointerdowns.pop(exact, None)
            return
        page_id = str(ev.get("page_id") or "")
        button = str(ev.get("button") or "")
        for key, item in list(self._pending_pointerdowns.items()):
            event = item.get("event")
            meta = getattr(event, "meta", {}) or {}
            if str(meta.get("page_id") or "") == page_id and str(meta.get("button") or "") == button:
                self._pending_pointerdowns.pop(key, None)
                return

    def _flush_pending_pointerdowns(
        self, *, force: bool = False, page_id: str = ""
    ) -> None:
        now = time.monotonic()
        ready = [
            key for key, item in self._pending_pointerdowns.items()
            if (not page_id or item.get("page_id") == page_id)
            and (force or float(item.get("due") or 0.0) <= now)
        ]
        for key in ready:
            item = self._pending_pointerdowns.pop(key, None) or {}
            event = item.get("event")
            if event is not None:
                event.meta["pointerdown_fallback"] = True
                self.emit(event)