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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 Core from '../core/core.js';\nimport * as Graph from '../graph/graph.js';\nimport type * as Simulation from '../simulation/simulation.js';\n\nimport {\n  type Extras,\n  Metric,\n  type MetricCoefficients,\n  type MetricComputationDataInput,\n  type MetricResult,\n} from './Metric.js';\n\n// Any CPU task of 20 ms or more will end up being a critical long task on mobile\nconst CRITICAL_LONG_TASK_THRESHOLD = 20;\n\nclass Interactive extends Metric {\n  static override get coefficients(): MetricCoefficients {\n    return {\n      intercept: 0,\n      optimistic: 0.45,\n      pessimistic: 0.55,\n    };\n  }\n\n  static override getOptimisticGraph<T>(dependencyGraph: Graph.Node<T>): Graph.Node<T> {\n    // Adjust the critical long task threshold for microseconds\n    const minimumCpuTaskDuration = CRITICAL_LONG_TASK_THRESHOLD * 1000;\n\n    return dependencyGraph.cloneWithRelationships(node => {\n      // Include everything that might be a long task\n      if (node.type === Graph.BaseNode.types.CPU) {\n        return node.duration > minimumCpuTaskDuration;\n      }\n\n      // Include all scripts and high priority requests, exclude all images\n      const isImage = node.request.resourceType === 'Image';\n      const isScript = node.request.resourceType === 'Script';\n      return (!isImage && (isScript || node.request.priority === 'High' || node.request.priority === 'VeryHigh'));\n    });\n  }\n\n  static override getPessimisticGraph<T>(dependencyGraph: Graph.Node<T>): Graph.Node<T> {\n    return dependencyGraph;\n  }\n\n  static override getEstimateFromSimulation(simulationResult: Simulation.Result, extras: Extras): Simulation.Result {\n    if (!extras.lcpResult) {\n      throw new Core.LanternError('missing lcpResult');\n    }\n\n    const lastTaskAt = Interactive.getLastLongTaskEndTime(simulationResult.nodeTimings);\n    const minimumTime = extras.optimistic ? extras.lcpResult.optimisticEstimate.timeInMs :\n                                            extras.lcpResult.pessimisticEstimate.timeInMs;\n    return {\n      timeInMs: Math.max(minimumTime, lastTaskAt),\n      nodeTimings: simulationResult.nodeTimings,\n    };\n  }\n\n  static override compute(data: MetricComputationDataInput, extras?: Omit<Extras, 'optimistic'>): MetricResult {\n    const lcpResult = extras?.lcpResult;\n    if (!lcpResult) {\n      throw new Core.LanternError('LCP is required to calculate the Interactive metric');\n    }\n\n    const metricResult = super.compute(data, extras);\n    metricResult.timing = Math.max(metricResult.timing, lcpResult.timing);\n    return metricResult;\n  }\n\n  static getLastLongTaskEndTime(nodeTimings: Simulation.Result['nodeTimings'], duration = 50): number {\n    return Array.from(nodeTimings.entries())\n        .filter(([node, timing]) => {\n          if (node.type !== Graph.BaseNode.types.CPU) {\n            return false;\n          }\n          return timing.duration > duration;\n        })\n        .map(([_, timing]) => timing.endTime)\n        .reduce((max, x) => Math.max(max || 0, x || 0), 0);\n  }\n}\n\nexport {Interactive};\n"]}