import type {  DesktopHostTelemetrySnapshot,  ResourceMonitorProcessSample,  ResourceMonitorSnapshotEvent,} from "@t3tools/contracts";import { describe, expect, it } from "@effect/vitest";import * as DateTime from "effect/DateTime";import * as Deferred from "effect/Deferred";import * as Duration from "effect/Duration";import * as Effect from "effect/Effect";import * as Fiber from "effect/Fiber";import * as Layer from "effect/Layer";import * as Option from "effect/Option";import * as PubSub from "effect/PubSub";import * as Ref from "effect/Ref";import * as Stream from "effect/Stream";import * as TestClock from "effect/testing/TestClock"; import * as DesktopTelemetryReceiver from "./DesktopTelemetryReceiver.ts";import * as NativeTelemetryClient from "./NativeTelemetryClient.ts";import * as ResourceAttribution from "./ResourceAttribution.ts";import * as ResourceTelemetry from "./ResourceTelemetry.ts"; function processSample(  input: Partial<ResourceMonitorProcessSample> &    Pick<ResourceMonitorProcessSample, "pid" | "ppid" | "startTimeMs">,): ResourceMonitorProcessSample {  return {    runTimeMs: 1_000,    name: `process-${input.pid}`,    command: `process-${input.pid}`,    status: "Running",    cpuPercent: 0,    cpuTimeMs: 0,    residentBytes: 1_024,    virtualBytes: 2_048,    ioReadBytes: 0,    ioWriteBytes: 0,    ioSemantics: "storage",    ...input,  };} function nativeSnapshot(input: {  readonly sequence: number;  readonly sampledAtUnixMs: number;  readonly childCpuTimeMs: number;  readonly childWriteBytes: number;  readonly externalProcesses?: ResourceMonitorSnapshotEvent["externalProcesses"];}): ResourceMonitorSnapshotEvent {  const processes = [    processSample({      pid: process.pid,      ppid: 1,      startTimeMs: 100,      cpuTimeMs: input.sequence * 10,    }),    processSample({      pid: 4_242,      ppid: process.pid,      startTimeMs: 200,      name: "codex",      command: "codex app-server",      cpuTimeMs: input.childCpuTimeMs,      ioWriteBytes: input.childWriteBytes,    }),    processSample({      pid: 5_000,      ppid: 1,      startTimeMs: 300,      name: "electron",      command: "electron",      cpuTimeMs: input.sequence * 20,    }),    processSample({      pid: 9_000,      ppid: process.pid,      startTimeMs: 400,      name: "t3-resource-monitor",      command: "t3-resource-monitor",      cpuTimeMs: input.sequence * 5,    }),  ];  return {    version: 3,    type: "snapshot",    sequence: input.sequence,    sampledAtUnixMs: input.sampledAtUnixMs,    collectionDurationMicros: 300,    scannedProcessCount: 80,    retainedProcessCount: processes.length,    inaccessibleProcessCount: 1,    ...(input.externalProcesses === undefined      ? {}      : { externalProcesses: input.externalProcesses }),    processes,  };} function nativeGeneration(  snapshot: ResourceMonitorSnapshotEvent,  generation: number,): NativeTelemetryClient.NativeTelemetrySnapshot {  return { generation, snapshot };} function desktopSnapshot(sampledAtUnixMs: number): DesktopHostTelemetrySnapshot {  const sampledAt = DateTime.makeUnsafe(sampledAtUnixMs);  return {    version: 1,    type: "desktopTelemetry",    sequence: 1,    sampledAtUnixMs,    electronPid: 5_000,    power: {      source: "electron-main",      idle: "false",      idleSeconds: 2,      locked: "false",      suspended: false,      onBattery: "true",      lowPowerMode: "unknown",      thermalState: "fair",      stale: false,      updatedAt: sampledAt,    },    speedLimitPercent: Option.some(90),    electronProcesses: [      {        pid: 5_000,        creationTimeMs: 300,        type: "Browser",        name: "electron",        cpuPercent: 2,        cumulativeCpuSeconds: 0.02,        idleWakeupsPerSecond: 3,        workingSetBytes: 4_096,        peakWorkingSetBytes: 8_192,      },    ],  };} describe("ResourceTelemetry", () => {  it.effect("enables live native and Electron collection only while changes are retained", () =>    Effect.gen(function* () {      const sampledAtUnixMs = DateTime.toEpochMillis(yield* DateTime.now);      const sample = nativeSnapshot({        sequence: 1,        sampledAtUnixMs,        childCpuTimeMs: 100,        childWriteBytes: 1_000,      });      const demandChanges = yield* Ref.make<ReadonlyArray<boolean>>([]);      const nativeLayer = NativeTelemetryClient.layerTest({        sampleNow: Effect.succeed(nativeGeneration(sample, 0)),        health: Effect.succeed({          status: "healthy",          hello: Option.none(),          lastSampleAt: Option.none(),          lastError: Option.none(),          restartCount: 0,          sampleIntervalMs: 1_000,        }),      });      const desktopLayer = DesktopTelemetryReceiver.layerTest({        latest: Effect.succeedSome(desktopSnapshot(sampledAtUnixMs)),        setDiagnosticsDemand: (enabled) =>          Ref.update(demandChanges, (changes) => [...changes, enabled]),      });      const telemetryLayer = ResourceTelemetry.layer.pipe(        Layer.provide(Layer.mergeAll(nativeLayer, desktopLayer, ResourceAttribution.layer)),      );       const live = yield* Stream.runHead(        Effect.gen(function* () {          const telemetry = yield* ResourceTelemetry.ResourceTelemetry;          return telemetry.changes;        }).pipe(Stream.unwrap),      ).pipe(Effect.provide(telemetryLayer));       expect(Option.isSome(live)).toBe(true);      expect(yield* Ref.get(demandChanges)).toEqual([true, false]);    }),  );   it.effect("releases live demand when acquisition is interrupted by an idle collector", () =>    Effect.gen(function* () {      const sampledAtUnixMs = DateTime.toEpochMillis(yield* DateTime.now);      const demandChanges = yield* Ref.make<ReadonlyArray<boolean>>([]);      const nativeLayer = NativeTelemetryClient.layerTest({        sampleNow: Effect.never,        health: Effect.succeed({          status: "healthy",          hello: Option.none(),          lastSampleAt: Option.none(),          lastError: Option.none(),          restartCount: 0,          sampleIntervalMs: 1_000,        }),      });      const desktopLayer = DesktopTelemetryReceiver.layerTest({        latest: Effect.succeedSome(desktopSnapshot(sampledAtUnixMs)),        setDiagnosticsDemand: (enabled) =>          Ref.update(demandChanges, (changes) => [...changes, enabled]),      });      const telemetryLayer = ResourceTelemetry.layer.pipe(        Layer.provide(Layer.mergeAll(nativeLayer, desktopLayer, ResourceAttribution.layer)),      );       const resultFiber = yield* Stream.runHead(        Effect.gen(function* () {          const telemetry = yield* ResourceTelemetry.ResourceTelemetry;          return telemetry.changes;        }).pipe(Stream.unwrap),      ).pipe(Effect.timeoutOption("10 millis"), Effect.provide(telemetryLayer), Effect.forkChild);      yield* Effect.yieldNow;      yield* TestClock.adjust("10 millis");      const result = yield* Fiber.join(resultFiber);       expect(Option.isNone(result)).toBe(true);      expect(yield* Ref.get(demandChanges)).toEqual([true, false]);    }),  );   it.effect(    "attributes an initial Electron root from the identity recorded by the native snapshot",    () =>      Effect.gen(function* () {        const sampledAtUnixMs = DateTime.toEpochMillis(yield* DateTime.now);        const sample = nativeSnapshot({          sequence: 1,          sampledAtUnixMs,          childCpuTimeMs: 100,          childWriteBytes: 1_000,          externalProcesses: [{ pid: 5_000, startTimeMs: 300 }],        });        const desktop = {          ...desktopSnapshot(sampledAtUnixMs),          electronProcesses: [],        };        const nativeLayer = NativeTelemetryClient.layerTest({          sampleNow: Effect.succeed(nativeGeneration(sample, 0)),          health: Effect.succeed({            status: "healthy",            hello: Option.none(),            lastSampleAt: Option.none(),            lastError: Option.none(),            restartCount: 0,            sampleIntervalMs: 1_000,          }),        });        const desktopLayer = DesktopTelemetryReceiver.layerTest({          latest: Effect.succeedSome(desktop),        });        const telemetryLayer = ResourceTelemetry.layer.pipe(          Layer.provide(Layer.mergeAll(nativeLayer, desktopLayer, ResourceAttribution.layer)),        );         const snapshot = yield* Effect.gen(function* () {          const telemetry = yield* ResourceTelemetry.ResourceTelemetry;          return yield* telemetry.refresh;        }).pipe(Effect.provide(telemetryLayer));         expect(snapshot.processes.find((entry) => entry.identity.pid === 5_000)?.category).toBe(          "electron-main",        );        expect(snapshot.groups.electron.processStarts).toBe(1);        expect(snapshot.groups.backend.processStarts).toBe(3);      }),  );   it.effect("rejects buffered snapshots from an earlier sidecar generation", () =>    Effect.scoped(      Effect.gen(function* () {        const startedAt = DateTime.toEpochMillis(yield* DateTime.now);        const stale = nativeSnapshot({          sequence: 100,          sampledAtUnixMs: startedAt + 1_000,          childCpuTimeMs: 100,          childWriteBytes: 1_000,        });        const current = nativeSnapshot({          sequence: 1,          sampledAtUnixMs: startedAt + 2_000,          childCpuTimeMs: 200,          childWriteBytes: 2_000,        });        const nativeSnapshots =          yield* PubSub.unbounded<NativeTelemetryClient.NativeTelemetrySnapshot>();        const nativeLayer = NativeTelemetryClient.layerTest({          snapshots: Stream.fromPubSub(nativeSnapshots),          sampleNow: Effect.never,          health: Effect.succeed({            status: "healthy",            hello: Option.none(),            lastSampleAt: Option.none(),            lastError: Option.none(),            restartCount: 1,            sampleIntervalMs: 1_000,          }),        });        const telemetryLayer = ResourceTelemetry.layer.pipe(          Layer.provide(            Layer.mergeAll(              nativeLayer,              DesktopTelemetryReceiver.layerTest(),              ResourceAttribution.layer,            ),          ),        );         yield* Effect.gen(function* () {          const telemetry = yield* ResourceTelemetry.ResourceTelemetry;          const subscription = yield* telemetry.subscribe;          const nextSnapshot = yield* Stream.runHead(subscription.changes).pipe(Effect.forkChild);           yield* PubSub.publish(nativeSnapshots, nativeGeneration(stale, 0));          yield* Effect.yieldNow;          expect((yield* telemetry.latest).health.scannedProcessCount).toBe(0);           yield* PubSub.publish(nativeSnapshots, nativeGeneration(current, 1));          const received = yield* Fiber.join(nextSnapshot);           expect(Option.isSome(received)).toBe(true);          expect(DateTime.toEpochMillis(Option.getOrThrow(received).readAt)).toBe(            current.sampledAtUnixMs,          );        }).pipe(Effect.provide(telemetryLayer));      }),    ),  );   it.effect("retains desktop health changes while aggregate telemetry initializes", () =>    Effect.scoped(      Effect.gen(function* () {        const health = yield* Ref.make<DesktopTelemetryReceiver.DesktopTelemetryReceiverHealth>({          status: "starting",          lastSampleAt: Option.none(),          lastError: Option.none(),        });        const healthChanges =          yield* PubSub.sliding<DesktopTelemetryReceiver.DesktopTelemetryReceiverHealth>(4);        const healthSubscribed = yield* Deferred.make<void>();        const finishDesktopSnapshot = yield* Deferred.make<void>();        const desktopLayer = DesktopTelemetryReceiver.layerTest({          health: Ref.get(health),          subscribeHealth: Effect.gen(function* () {            const subscription = yield* PubSub.subscribe(healthChanges);            const latest = yield* Ref.get(health);            yield* Deferred.succeed(healthSubscribed, undefined);            return {              latest,              changes: Stream.fromSubscription(subscription),            };          }),          subscribe: Deferred.await(finishDesktopSnapshot).pipe(            Effect.as({              latest: Option.none(),              changes: Stream.empty,            }),          ),        });        const telemetryLayer = ResourceTelemetry.layer.pipe(          Layer.provide(            Layer.mergeAll(              NativeTelemetryClient.layerTest(),              desktopLayer,              ResourceAttribution.layer,            ),          ),        );        const resultFiber = yield* Effect.gen(function* () {          const telemetry = yield* ResourceTelemetry.ResourceTelemetry;          while (true) {            const snapshot = yield* telemetry.latest;            if (snapshot.health.desktop.status === "degraded") return snapshot;            yield* Effect.yieldNow;          }        }).pipe(Effect.provide(telemetryLayer), Effect.timeout("1 second"), Effect.forkChild);         yield* Deferred.await(healthSubscribed);        const degraded: DesktopTelemetryReceiver.DesktopTelemetryReceiverHealth = {          status: "degraded",          lastSampleAt: Option.none(),          lastError: Option.some("desktop telemetry failed"),        };        yield* Ref.set(health, degraded);        yield* PubSub.publish(healthChanges, degraded);        yield* Deferred.succeed(finishDesktopSnapshot, undefined);         const snapshot = yield* Fiber.join(resultFiber);        expect(snapshot.health.desktop.status).toBe("degraded");        expect(Option.getOrNull(snapshot.health.desktop.lastError)).toBe(          "desktop telemetry failed",        );      }),    ),  );   it.effect("atomically subscribes while a desktop update is being rebuilt", () =>    Effect.scoped(      Effect.gen(function* () {        const startedAt = DateTime.toEpochMillis(yield* DateTime.now);        const nextDesktopSnapshot = desktopSnapshot(startedAt + 1_000);        const desktopChanges = yield* PubSub.unbounded<DesktopHostTelemetrySnapshot>();        const rebuildStarted = yield* Deferred.make<void>();        const finishRebuild = yield* Deferred.make<void>();        const attributionReads = yield* Ref.make(0);        const attributionLayer = Layer.succeed(          ResourceAttribution.ResourceAttribution,          ResourceAttribution.ResourceAttribution.of({            record: () => Effect.void,            snapshot: Ref.updateAndGet(attributionReads, (count) => count + 1).pipe(              Effect.flatMap((count) =>                count === 1                  ? Effect.void                  : Deferred.succeed(rebuildStarted, undefined).pipe(                      Effect.andThen(Deferred.await(finishRebuild)),                    ),              ),              Effect.andThen(                Effect.succeed({                  readAt: DateTime.makeUnsafe(startedAt),                  entries: [],                }),              ),            ),          }),        );        const nativeLayer = NativeTelemetryClient.layerTest({          sampleNow: Effect.never,          health: Effect.succeed({            status: "healthy",            hello: Option.none(),            lastSampleAt: Option.none(),            lastError: Option.none(),            restartCount: 0,            sampleIntervalMs: 1_000,          }),        });        const desktopLayer = DesktopTelemetryReceiver.layerTest({          changes: Stream.fromPubSub(desktopChanges),        });        const telemetryLayer = ResourceTelemetry.layer.pipe(          Layer.provide(Layer.mergeAll(nativeLayer, desktopLayer, attributionLayer)),        );         yield* Effect.gen(function* () {          const telemetry = yield* ResourceTelemetry.ResourceTelemetry;          yield* Effect.yieldNow;          yield* PubSub.publish(desktopChanges, nextDesktopSnapshot);          yield* Deferred.await(rebuildStarted);           const subscriptionFiber = yield* telemetry.subscribe.pipe(Effect.forkChild);          yield* Effect.yieldNow;          yield* Deferred.succeed(finishRebuild, undefined);          const subscription = yield* Fiber.join(subscriptionFiber);           expect(DateTime.toEpochMillis(subscription.latest.readAt)).toBe(            nextDesktopSnapshot.sampledAtUnixMs,          );          expect(subscription.latest.power).toEqual(nextDesktopSnapshot.power);        }).pipe(Effect.provide(telemetryLayer));      }),    ),  );   it.effect("combines native, Electron, attribution, retry, and history data", () =>    Effect.gen(function* () {      const startedAt = DateTime.toEpochMillis(yield* DateTime.now);      const samples = [        nativeSnapshot({          sequence: 1,          sampledAtUnixMs: startedAt,          childCpuTimeMs: 100,          childWriteBytes: 1_000,        }),        nativeSnapshot({          sequence: 2,          sampledAtUnixMs: startedAt + 1_000,          childCpuTimeMs: 350,          childWriteBytes: 5_000,        }),        nativeSnapshot({          sequence: 1,          sampledAtUnixMs: startedAt + 2_000,          childCpuTimeMs: 500,          childWriteBytes: 7_000,        }),      ] as const;      const sampleIndex = yield* Ref.make(0);      const externalProcesses = yield* Ref.make<        ReadonlyArray<{ readonly pid: number; readonly startTimeMs?: number }>      >([]);      const retryCount = yield* Ref.make(0);      const nativeHealth = yield* Ref.make<NativeTelemetryClient.NativeTelemetryClientHealth>({        status: "healthy",        hello: Option.some({          version: 3,

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