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+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {getLoadState} from '../lib/getLoadState.js';
+import {getSelector} from '../lib/getSelector.js';
+import {
+  longestInteractionList,
+  entryPreProcessingCallbacks,
+  longestInteractionMap,
+} from '../lib/interactions.js';
+import {observe} from '../lib/observe.js';
+import {whenIdle} from '../lib/whenIdle.js';
+import {onINP as unattributedOnINP} from '../onINP.js';
+import {
+  INPAttribution,
+  INPMetric,
+  INPMetricWithAttribution,
+  ReportOpts,
+} from '../types.js';
+
+interface pendingEntriesGroup {
+  startTime: DOMHighResTimeStamp;
+  processingStart: DOMHighResTimeStamp;
+  processingEnd: DOMHighResTimeStamp;
+  renderTime: DOMHighResTimeStamp;
+  entries: PerformanceEventTiming[];
+}
+
+// The maximum number of previous frames for which data is kept.
+// Storing data about previous frames is necessary to handle cases where event
+// and LoAF entries are dispatched out of order, and so a buffer of previous
+// frame data is needed to determine various bits of INP attribution once all
+// the frame-related data has come in.
+// In most cases this out-of-order data is only off by a frame or two, so
+// keeping the most recent 50 should be more than sufficient.
+const MAX_PREVIOUS_FRAMES = 50;
+
+// A PerformanceObserver, observing new `long-animation-frame` entries.
+// If this variable is defined it means the browser supports LoAF.
+let loafObserver: PerformanceObserver | undefined;
+
+// A list of LoAF entries that have been dispatched and could potentially
+// intersect with the INP candidate interaction. Note that periodically this
+// list is cleaned up and entries that are known to not match INP are removed.
+let pendingLoAFs: PerformanceLongAnimationFrameTiming[] = [];
+
+// An array of groups of all the event timing entries that occurred within a
+// particular frame. Note that periodically this array is cleaned up and entries
+// that are known to not match INP are removed.
+let pendingEntriesGroups: pendingEntriesGroup[] = [];
+
+// The `processingEnd` time of most recently-processed event, chronologically.
+let latestProcessingEnd: number = 0;
+
+// A WeakMap to look up the event-timing-entries group of a given entry.
+// Note that this only maps from "important" entries: either the first input or
+// those with an `interactionId`.
+const entryToEntriesGroupMap: WeakMap<
+  PerformanceEventTiming,
+  pendingEntriesGroup
+> = new WeakMap();
+
+// A mapping of interactionIds to the target Node.
+export const interactionTargetMap: Map<number, Node> = new Map();
+
+// A reference to the idle task used to clean up entries from the above
+// variables. If the value is -1 it means no task is queue, and if it's
+// greater than -1 the value corresponds to the idle callback handle.
+let idleHandle: number = -1;
+
+/**
+ * Adds new LoAF entries to the `pendingLoAFs` list.
+ */
+const handleLoAFEntries = (entries: PerformanceLongAnimationFrameTiming[]) => {
+  pendingLoAFs = pendingLoAFs.concat(entries);
+  queueCleanup();
+};
+
+// Get a reference to the interaction target element in case it's removed
+// from the DOM later.
+const saveInteractionTarget = (entry: PerformanceEventTiming) => {
+  if (
+    entry.interactionId &&
+    entry.target &&
+    !interactionTargetMap.has(entry.interactionId)
+  ) {
+    interactionTargetMap.set(entry.interactionId, entry.target);
+  }
+};
+
+/**
+ * Groups entries that were presented within the same animation frame by
+ * a common `renderTime`. This function works by referencing
+ * `pendingEntriesGroups` and using an existing render time if one is found
+ * (otherwise creating a new one). This function also adds all interaction
+ * entries to an `entryToRenderTimeMap` WeakMap so that the "grouped" entries
+ * can be looked up later.
+ */
+const groupEntriesByRenderTime = (entry: PerformanceEventTiming) => {
+  const renderTime = entry.startTime + entry.duration;
+  let group;
+
+  latestProcessingEnd = Math.max(latestProcessingEnd, entry.processingEnd);
+
+  // Iterate over all previous render times in reverse order to find a match.
+  // Go in reverse since the most likely match will be at the end.
+  for (let i = pendingEntriesGroups.length - 1; i >= 0; i--) {
+    const potentialGroup = pendingEntriesGroups[i];
+
+    // If a group's render time is within 8ms of the entry's render time,
+    // assume they were part of the same frame and add it to the group.
+    if (Math.abs(renderTime - potentialGroup.renderTime) <= 8) {
+      group = potentialGroup;
+      group.startTime = Math.min(entry.startTime, group.startTime);
+      group.processingStart = Math.min(
+        entry.processingStart,
+        group.processingStart,
+      );
+      group.processingEnd = Math.max(entry.processingEnd, group.processingEnd);
+      group.entries.push(entry);
+
+      break;
+    }
+  }
+
+  // If there was no matching group, assume this is a new frame.
+  if (!group) {
+    group = {
+      startTime: entry.startTime,
+      processingStart: entry.processingStart,
+      processingEnd: entry.processingEnd,
+      renderTime,
+      entries: [entry],
+    };
+
+    pendingEntriesGroups.push(group);
+  }
+
+  // Store the grouped render time for this entry for reference later.
+  if (entry.interactionId || entry.entryType === 'first-input') {
+    entryToEntriesGroupMap.set(entry, group);
+  }
+
+  queueCleanup();
+};
+
+const queueCleanup = () => {
+  // Queue cleanup of entries that are not part of any INP candidates.
+  if (idleHandle < 0) {
+    idleHandle = whenIdle(cleanupEntries);
+  }
+};
+
+const cleanupEntries = () => {
+  // Delete any stored interaction target elements if they're not part of one
+  // of the 10 longest interactions.
+  if (interactionTargetMap.size > 10) {
+    interactionTargetMap.forEach((_, key) => {
+      if (!longestInteractionMap.has(key)) {
+        interactionTargetMap.delete(key);
+      }
+    });
+  }
+
+  // Keep all render times that are part of a pending INP candidate or
+  // that occurred within the 50 most recently-dispatched groups of events.
+  const longestInteractionGroups = longestInteractionList.map((i) => {
+    return entryToEntriesGroupMap.get(i.entries[0]);
+  });
+  const minIndex = pendingEntriesGroups.length - MAX_PREVIOUS_FRAMES;
+  pendingEntriesGroups = pendingEntriesGroups.filter((group, index) => {
+    if (index >= minIndex) return true;
+    return longestInteractionGroups.includes(group);
+  });
+
+  // Keep all pending LoAF entries that either:
+  // 1) intersect with entries in the newly cleaned up `pendingEntriesGroups`
+  // 2) occur after the most recently-processed event entry (for up to MAX_PREVIOUS_FRAMES)
+  const loafsToKeep: Set<PerformanceLongAnimationFrameTiming> = new Set();
+  for (let i = 0; i < pendingEntriesGroups.length; i++) {
+    const group = pendingEntriesGroups[i];
+    getIntersectingLoAFs(group.startTime, group.processingEnd).forEach(
+      (loaf) => {
+        loafsToKeep.add(loaf);
+      },
+    );
+  }
+  const prevFrameIndexCutoff = pendingLoAFs.length - 1 - MAX_PREVIOUS_FRAMES;
+  // Filter `pendingLoAFs` to preserve LoAF order.
+  pendingLoAFs = pendingLoAFs.filter((loaf, index) => {
+    if (loaf.startTime > latestProcessingEnd && index > prevFrameIndexCutoff) {
+      return true;
+    }
+
+    return loafsToKeep.has(loaf);
+  });
+
+  // Reset the idle callback handle so it can be queued again.
+  idleHandle = -1;
+};
+
+entryPreProcessingCallbacks.push(
+  saveInteractionTarget,
+  groupEntriesByRenderTime,
+);
+
+const getIntersectingLoAFs = (
+  start: DOMHighResTimeStamp,
+  end: DOMHighResTimeStamp,
+) => {
+  const intersectingLoAFs = [];
+
+  for (let i = 0, loaf; (loaf = pendingLoAFs[i]); i++) {
+    // If the LoAF ends before the given start time, ignore it.
+    if (loaf.startTime + loaf.duration < start) continue;
+
+    // If the LoAF starts after the given end time, ignore it and all
+    // subsequent pending LoAFs (because they're in time order).
+    if (loaf.startTime > end) break;
+
+    // Still here? If so this LoAF intersects with the interaction.
+    intersectingLoAFs.push(loaf);
+  }
+  return intersectingLoAFs;
+};
+
+const attributeINP = (metric: INPMetric): INPMetricWithAttribution => {
+  const firstEntry = metric.entries[0];
+  const group = entryToEntriesGroupMap.get(firstEntry)!;
+
+  const processingStart = firstEntry.processingStart;
+  const processingEnd = group.processingEnd;
+
+  // Sort the entries in processing time order.
+  const processedEventEntries = group.entries.sort((a, b) => {
+    return a.processingStart - b.processingStart;
+  });
+
+  const longAnimationFrameEntries: PerformanceLongAnimationFrameTiming[] =
+    getIntersectingLoAFs(firstEntry.startTime, processingEnd);
+
+  // The first interaction entry may not have a target defined, so use the
+  // first one found in the entry list.
+  // TODO: when the following bug is fixed just use `firstInteractionEntry`.
+  // https://bugs.chromium.org/p/chromium/issues/detail?id=1367329
+  // As a fallback, also check the interactionTargetMap (to account for
+  // cases where the element is removed from the DOM before reporting happens).
+  const firstEntryWithTarget = metric.entries.find((entry) => entry.target);
+  const interactionTargetElement =
+    (firstEntryWithTarget && firstEntryWithTarget.target) ||
+    interactionTargetMap.get(firstEntry.interactionId);
+
+  // Since entry durations are rounded to the nearest 8ms, we need to clamp
+  // the `nextPaintTime` value to be higher than the `processingEnd` or
+  // end time of any LoAF entry.
+  const nextPaintTimeCandidates = [
+    firstEntry.startTime + firstEntry.duration,
+    processingEnd,
+  ].concat(
+    longAnimationFrameEntries.map((loaf) => loaf.startTime + loaf.duration),
+  );
+
+  const nextPaintTime = Math.max.apply(Math, nextPaintTimeCandidates);
+
+  const attribution: INPAttribution = {
+    interactionTarget: getSelector(interactionTargetElement),
+    interactionTargetElement: interactionTargetElement,
+    interactionType: firstEntry.name.startsWith('key') ? 'keyboard' : 'pointer',
+    interactionTime: firstEntry.startTime,
+    nextPaintTime: nextPaintTime,
+    processedEventEntries: processedEventEntries,
+    longAnimationFrameEntries: longAnimationFrameEntries,
+    inputDelay: processingStart - firstEntry.startTime,
+    processingDuration: processingEnd - processingStart,
+    presentationDelay: Math.max(nextPaintTime - processingEnd, 0),
+    loadState: getLoadState(firstEntry.startTime),
+  };
+
+  // Use Object.assign to set property to keep tsc happy.
+  const metricWithAttribution: INPMetricWithAttribution = Object.assign(
+    metric,
+    {attribution},
+  );
+  return metricWithAttribution;
+};
+
+/**
+ * Calculates the [INP](https://web.dev/articles/inp) value for the current
+ * page and calls the `callback` function once the value is ready, along with
+ * the `event` performance entries reported for that interaction. The reported
+ * value is a `DOMHighResTimeStamp`.
+ *
+ * A custom `durationThreshold` configuration option can optionally be passed to
+ * control what `event-timing` entries are considered for INP reporting. The
+ * default threshold is `40`, which means INP scores of less than 40 are
+ * reported as 0. Note that this will not affect your 75th percentile INP value
+ * unless that value is also less than 40 (well below the recommended
+ * [good](https://web.dev/articles/inp#what_is_a_good_inp_score) threshold).
+ *
+ * If the `reportAllChanges` configuration option is set to `true`, the
+ * `callback` function will be called as soon as the value is initially
+ * determined as well as any time the value changes throughout the page
+ * lifespan.
+ *
+ * _**Important:** INP should be continually monitored for changes throughout
+ * the entire lifespan of a page—including if the user returns to the page after
+ * it's been hidden/backgrounded. However, since browsers often [will not fire
+ * additional callbacks once the user has backgrounded a
+ * page](https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden),
+ * `callback` is always called when the page's visibility state changes to
+ * hidden. As a result, the `callback` function might be called multiple times
+ * during the same page load._
+ */
+export const onINP = (
+  onReport: (metric: INPMetricWithAttribution) => void,
+  opts?: ReportOpts,
+) => {
+  if (!loafObserver) {
+    loafObserver = observe('long-animation-frame', handleLoAFEntries);
+  }
+  unattributedOnINP((metric: INPMetric) => {
+    const metricWithAttribution = attributeINP(metric);
+    onReport(metricWithAttribution);
+  }, opts);
+};