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All rights reserved.\n// Use of this source code is governed by a BSD-style license that can be\n// found in the LICENSE file.\n\nimport * as Platform from '../../../core/platform/platform.js';\nimport type * as Protocol from '../../../generated/protocol.js';\nimport * as Types from '../types/types.js';\n\nimport {data as metaData} from './MetaHandler.js';\nimport {data as networkRequestsData} from './NetworkRequestsHandler.js';\nimport {data as pageLoadMetricsData, MetricName} from './PageLoadMetricsHandler.js';\nimport type {HandlerName} from './types.js';\n\n/**\n * If the LCP resource was an image, and that image was fetched over the\n * network, we want to be able to find the network request in order to construct\n * the critical path for an LCP image.\n * Within the trace file there are `LargestImagePaint::Candidate` events.\n * Within their data object, they contain a `DOMNodeId` property, which maps to\n * the DOM Node ID for that image.\n *\n * This id maps exactly to the `data.nodeId` property that a\n * `LargestContentfulPaint::Candidate` will have. So, when we find an image\n * paint candidate, we can store it, keying it on the node ID.\n * Then, when it comes to finding the network request for an LCP image, we can\n * use the nodeId from the LCP candidate to find the image candidate. That image\n * candidate also contains a `imageUrl` property, which will have the full URL\n * to the image.\n *\n * `BackendNodeId`s are only unique within a given renderer process, so this is\n * also keyed on `ProcessId`.\n **/\nconst imagePaintsByNodeIdAndProcess =\n    new Map<Types.Events.ProcessID, Map<Protocol.DOM.BackendNodeId, Types.Events.LargestImagePaintCandidate>>();\nconst lcpRequestByNavigationId = new Map<string, Types.Events.SyntheticNetworkRequest>();\n\nexport function reset(): void {\n  imagePaintsByNodeIdAndProcess.clear();\n}\n\nexport function handleEvent(event: Types.Events.Event): void {\n  if (!Types.Events.isLargestImagePaintCandidate(event) || !event.args.data) {\n    return;\n  }\n\n  const imagePaintsByNodeId =\n      Platform.MapUtilities.getWithDefault(imagePaintsByNodeIdAndProcess, event.pid, () => new Map());\n  imagePaintsByNodeId.set(event.args.data.DOMNodeId, event);\n}\n\nexport async function finalize(): Promise<void> {\n  const requests = networkRequestsData().byTime;\n  const {traceBounds, navigationsByNavigationId} = metaData();\n  const metricScoresByFrameId = pageLoadMetricsData().metricScoresByFrameId;\n\n  for (const [navigationId, navigation] of navigationsByNavigationId) {\n    const lcpMetric = metricScoresByFrameId.get(navigation.args.frame)?.get(navigationId)?.get(MetricName.LCP);\n    const lcpEvent = lcpMetric?.event;\n    if (!lcpEvent || !Types.Events.isLargestContentfulPaintCandidate(lcpEvent)) {\n      continue;\n    }\n\n    const nodeId = lcpEvent.args.data?.nodeId;\n    if (!nodeId) {\n      continue;\n    }\n\n    const lcpImagePaintEvent = imagePaintsByNodeIdAndProcess.get(lcpEvent.pid)?.get(nodeId);\n    const lcpUrl = lcpImagePaintEvent?.args.data?.imageUrl;\n    if (!lcpUrl) {\n      continue;\n    }\n\n    const startTime = navigation?.ts ?? traceBounds.min;\n    const endTime = lcpImagePaintEvent.ts;\n\n    let lcpRequest;\n    for (const request of requests) {\n      if (request.ts < startTime) {\n        continue;\n      }\n      if (request.ts >= endTime) {\n        break;\n      }\n\n      if (request.args.data.url === lcpUrl || request.args.data.redirects.some(r => r.url === lcpUrl)) {\n        lcpRequest = request;\n        break;\n      }\n    }\n\n    if (lcpRequest) {\n      lcpRequestByNavigationId.set(navigationId, lcpRequest);\n    }\n  }\n}\n\nexport interface LargestImagePaintData {\n  lcpRequestByNavigationId: Map<string, Types.Events.SyntheticNetworkRequest>;\n}\n\nexport function data(): LargestImagePaintData {\n  return {lcpRequestByNavigationId};\n}\n\nexport function deps(): HandlerName[] {\n  return ['Meta', 'NetworkRequests', 'PageLoadMetrics'];\n}\n"]}