import {  EnvironmentId,  type ServerConfig,  type ServerConfigStreamEvent,  type ServerLifecycleWelcomePayload,  WS_METHODS,} from "@t3tools/contracts";import { describe, expect, it } from "@effect/vitest";import * as Cause from "effect/Cause";import * as Deferred from "effect/Deferred";import * as Duration from "effect/Duration";import * as Effect from "effect/Effect";import * as Exit from "effect/Exit";import * as Fiber from "effect/Fiber";import * as Option from "effect/Option";import * as Queue from "effect/Queue";import * as Ref from "effect/Ref";import * as Stream from "effect/Stream";import * as SubscriptionRef from "effect/SubscriptionRef";import * as TestClock from "effect/testing/TestClock";import { RpcClientError } from "effect/unstable/rpc";import * as Socket from "effect/unstable/socket/Socket"; import {  AVAILABLE_CONNECTION_STATE,  PrimaryConnectionTarget,  type PreparedConnection,} from "../connection/model.ts";import * as EnvironmentSupervisor from "../connection/supervisor.ts";import * as Persistence from "../platform/persistence.ts";import type { WsRpcProtocolClient } from "../rpc/protocol.ts";import type { RpcSession } from "../rpc/session.ts";import {  applyServerWelcomeEvent,  makeEnvironmentServerWelcomeState,  makeEnvironmentServerConfigState,  isLegacyUpdateHandoffLoss,  matchesServerUpdateReadyEvent,  matchesServerUpdateResumeEvent,  nudgeReconnectDuringUpdateRestart,  resolveServerConfigValue,  resolveServerWelcomeState,  resolveServerUpdateProgressResult,  serverUpdateStateForProgressEvent,  serverUpdateStateForServerVersion,  validateServerUpdateReadyEvent,  waitForNextEnvironmentReconnect,  waitForDesktopUpdateTarget,  runDesktopCommitWithReconnectObserver,} from "./server.ts";import { applyServerConfigProjection } from "./serverConfigProjection.ts"; const CONFIG = {  availableEditors: [],  issues: [],  keybindings: {},  keybindingsConfigPath: null,  observability: null,  providers: [],  settings: {},  // Capabilities drive version-skew behaviour in the projection, so the  // fixture carries them rather than leaving the field absent.  environment: { capabilities: { environmentThemes: true } },} as unknown as ServerConfig; const snapshotEvent = (config: ServerConfig): ServerConfigStreamEvent => ({  version: 1,  type: "snapshot",  config,}); const TARGET = new PrimaryConnectionTarget({  environmentId: EnvironmentId.make("environment-1"),  label: "Test environment",  httpBaseUrl: "https://environment.example.test",  wsBaseUrl: "wss://environment.example.test",}); function session(client: WsRpcProtocolClient): RpcSession {  return {    client,    initialConfig: Effect.succeed(CONFIG),    subscribeServerConfig: (input) => client.subscribeServerConfig(input),    ready: Effect.void,    probe: Effect.void,    closed: Effect.never,  };} describe("update restart reconnect nudges", () => {  it.effect("retries a desktop commit that was lost before delivery", () =>    Effect.gen(function* () {      const readyEvents =        yield* Queue.unbounded<Parameters<typeof matchesServerUpdateReadyEvent>[1]>();      const ready = (serverVersion: string) =>        ({          version: 1 as const,          sequence: 1,          type: "ready" as const,          payload: {            at: "2026-09-01T00:00:00.000Z",            environment: { serverVersion },          },        }) as Parameters<typeof matchesServerUpdateReadyEvent>[1];      yield* Queue.offerAll(readyEvents, [ready("0.0.30"), ready("0.0.31")]);      const retries = yield* Ref.make(0);      const disconnect = new RpcClientError.RpcClientError({        reason: new Socket.SocketCloseError({ code: 1006 }),      });       const result = yield* waitForDesktopUpdateTarget(        "0.0.31",        Queue.take(readyEvents),        Ref.update(retries, (count) => count + 1).pipe(Effect.andThen(Effect.fail(disconnect))),      );       expect(result.payload.environment.serverVersion).toBe("0.0.31");      expect(yield* Ref.get(retries)).toBe(1);    }),  );  it.effect("observes a fast reconnect even when the caller awaits it later", () =>    Effect.gen(function* () {      const states = yield* Queue.unbounded<{ readonly phase: string }>();      const reconnected = yield* waitForNextEnvironmentReconnect(Stream.fromQueue(states)).pipe(        Effect.forkChild,      );      yield* Queue.offerAll(states, [        { phase: "connected" },        { phase: "backoff" },        { phase: "connected" },      ]);       yield* Fiber.join(reconnected);    }),  );  it.effect("arms the retry observer before a commit can disconnect", () =>    Effect.gen(function* () {      const allowSubscription = yield* Deferred.make<void>();      const subscriptionStarted = yield* Deferred.make<void>();      const states = yield* Queue.unbounded<{ readonly phase: string }>();      const commits = yield* Ref.make(0);      const disconnect = new RpcClientError.RpcClientError({        reason: new Socket.SocketCloseError({ code: 1006 }),      });      const stateChanges = Stream.unwrap(        Deferred.succeed(subscriptionStarted, undefined).pipe(          Effect.andThen(Deferred.await(allowSubscription)),          Effect.as(Stream.fromQueue(states)),        ),      );      const retry = yield* runDesktopCommitWithReconnectObserver(        stateChanges,        Ref.update(commits, (count) => count + 1).pipe(          Effect.andThen(Queue.offerAll(states, [{ phase: "backoff" }, { phase: "connected" }])),          Effect.andThen(Effect.fail(disconnect)),        ),      ).pipe(Effect.flip, Effect.forkChild);       yield* Deferred.await(subscriptionStarted);      expect(yield* Ref.get(commits)).toBe(0);      yield* Deferred.succeed(allowSubscription, undefined);      yield* Queue.offer(states, { phase: "connected" });       expect(yield* Fiber.join(retry)).toBe(disconnect);      expect(yield* Ref.get(commits)).toBe(1);    }),  );  it.effect("retries once per backoff entry instead of only the first", () =>    Effect.gen(function* () {      const retries = yield* Ref.make(0);      const states = [        { phase: "backoff" },        { phase: "connecting" },        { phase: "backoff" },        { phase: "backoff" },      ];       yield* nudgeReconnectDuringUpdateRestart({        stateChanges: Stream.fromIterable(states),        retryNow: Ref.update(retries, (count) => count + 1),        interval: Duration.zero,      });       // Three backoff entries, three nudges. The old one-shot behavior fired      // once and then let the supervisor's ladder stretch to 16-second gaps.      expect(yield* Ref.get(retries)).toBe(3);    }),  );   it.effect("paces nudges so a fast-failing connection cannot spin", () =>    Effect.gen(function* () {      const retries = yield* Ref.make(0);       const fiber = yield* Effect.forkChild(        nudgeReconnectDuringUpdateRestart({          stateChanges: Stream.fromIterable([{ phase: "backoff" }, { phase: "backoff" }]),          retryNow: Ref.update(retries, (count) => count + 1),        }),        { startImmediately: true },      );       // Each nudge waits out the interval first, so nothing fires immediately.      yield* TestClock.adjust(Duration.millis(999));      expect(yield* Ref.get(retries)).toBe(0);       yield* TestClock.adjust(Duration.millis(1));      expect(yield* Ref.get(retries)).toBe(1);       yield* TestClock.adjust(Duration.seconds(1));      expect(yield* Ref.get(retries)).toBe(2);       yield* Fiber.join(fiber);    }).pipe(Effect.provide(TestClock.layer())),  );   it.effect("retries rejected credentials only while the update restart is in progress", () =>    Effect.gen(function* () {      const retries = yield* Ref.make(0);       yield* nudgeReconnectDuringUpdateRestart({        stateChanges: Stream.fromIterable([          { phase: "blocked", lastFailure: { reason: "permission" } },          {            phase: "blocked",            lastFailure: {              reason: "authentication",              detail: "The environment credential is invalid.",            },          },          { phase: "blocked", lastFailure: { reason: "configuration" } },        ]),        retryNow: Ref.update(retries, (count) => count + 1),        interval: Duration.zero,      });       expect(yield* Ref.get(retries)).toBe(1);    }),  );}); describe("server state projection", () => {  it("only treats a legacy transport interruption as an unacknowledged handoff", () => {    expect(isLegacyUpdateHandoffLoss(Cause.interrupt(1))).toBe(true);    expect(      isLegacyUpdateHandoffLoss(        Cause.fail(          new RpcClientError.RpcClientError({            reason: new Socket.SocketCloseError({ code: 1006 }),          }),        ),      ),    ).toBe(true);    expect(      isLegacyUpdateHandoffLoss(        Cause.fail(          new RpcClientError.RpcClientError({            reason: new Socket.SocketOpenError({              kind: "Unknown",              cause: new Error("connection refused"),            }),          }),        ),      ),    ).toBe(false);    expect(      isLegacyUpdateHandoffLoss(        Cause.fail(          new RpcClientError.RpcClientError({            reason: new RpcClientError.RpcClientDefect({              message: "incompatible protocol",              cause: new Error("invalid response"),            }),          }),        ),      ),    ).toBe(false);    expect(isLegacyUpdateHandoffLoss(Cause.fail(new Error("Install failed.")))).toBe(false);  });   it.effect("resumes after the progress stream disconnects following completion", () => {    const result = {      targetVersion: "0.0.31",      method: "respawn" as const,    };    const disconnect = new RpcClientError.RpcClientError({      reason: new Socket.SocketCloseError({ code: 1006 }),    });     return Effect.gen(function* () {      const resumed = yield* resolveServerUpdateProgressResult(        result.targetVersion,        Option.some(result),        Exit.fail(disconnect),      );      expect(resumed).toEqual(result);    });  });   it("projects streamed update milestones into the shared operation state", () => {    expect(      serverUpdateStateForProgressEvent("0.0.30", "0.0.31", {        type: "progress",        stage: "installing",      }),    ).toEqual({      status: "running",      stage: "installing",      fromVersion: "0.0.30",      targetVersion: "0.0.31",    });    expect(      serverUpdateStateForProgressEvent("0.0.30", "0.0.31", {        type: "complete",        result: { targetVersion: "0.0.31", method: "respawn" },      }),    ).toEqual({      status: "running",      stage: "resuming",      fromVersion: "0.0.30",      targetVersion: "0.0.31",    });  });   it("keeps active update state and hides stale failures after a version change", () => {    const running = {      status: "running" as const,      stage: "resuming" as const,      fromVersion: "0.0.30",      targetVersion: "0.0.31",    };    const failed = {      status: "failed" as const,      stage: "installing" as const,      fromVersion: "0.0.30",      targetVersion: "0.0.31",      message: "Install failed.",    };     expect(serverUpdateStateForServerVersion(running, "0.0.31")).toBe(running);    expect(serverUpdateStateForServerVersion(failed, "0.0.30")).toBe(failed);    expect(serverUpdateStateForServerVersion(failed, null)).toBe(failed);    expect(serverUpdateStateForServerVersion(failed, "0.0.31")).toEqual({ status: "idle" });  });   it.effect("correlates launcher outcomes and fails immediately after rollback", () =>    Effect.gen(function* () {      const result = {        targetVersion: "0.0.31",        method: "boot-service" as const,        updateId: "update-1",      };      const ready = (status: "committed" | "rolled-back") =>        ({          version: 1 as const,          sequence: 1,          type: "ready" as const,          payload: {            at: "2026-08-01T00:00:00.000Z",            environment: { serverVersion: status === "committed" ? "0.0.31" : "0.0.30" },            updateOutcome: {              id: "update-1",              fromVersion: "0.0.30",              targetVersion: "0.0.31",              status,              ...(status === "rolled-back" ? { reason: "prepared-timeout" } : {}),            },          },        }) as Parameters<typeof matchesServerUpdateReadyEvent>[1];       expect(matchesServerUpdateReadyEvent(result, ready("committed"))).toBe(true);      yield* validateServerUpdateReadyEvent(result, ready("committed"));      const rollback = yield* Effect.flip(        validateServerUpdateReadyEvent(result, ready("rolled-back")),      );      expect(rollback.message).toBe("prepared-timeout");    }),  );   it("requires tokenless desktop updates to reach the target version", () => {    const ready = (serverVersion: string) =>      ({        version: 1 as const,        sequence: 1,        type: "ready" as const,        payload: {          at: "2026-09-01T00:00:00.000Z",          environment: { serverVersion },        },      }) as Parameters<typeof matchesServerUpdateResumeEvent>[1];     expect(      matchesServerUpdateResumeEvent(        { targetVersion: "0.0.31", method: "desktop-app" },        ready("0.0.30"),      ),    ).toBe(false);    expect(      matchesServerUpdateResumeEvent(        {          targetVersion: "0.0.31",          method: "desktop-app",          desktopUpdateToken: "update-1",        },        ready("0.0.30"),      ),    ).toBe(true);  });   it("applies every config category to the projected snapshot", () => {    const snapshot = applyServerConfigProjection(Option.none(), {      version: 1,      type: "snapshot",      config: CONFIG,    });    const settings = { ...CONFIG.settings };    const projected = applyServerConfigProjection(snapshot, {      version: 1,      type: "settingsUpdated",      payload: { settings },    });     const result = Option.getOrThrow(projected);    expect(result.config.settings).toBe(settings);    expect(result.latestEvent.type).toBe("settingsUpdated");  });   it("carries published environment themes in and out of the projected snapshot", () => {    const snapshot = applyServerConfigProjection(Option.none(), {      version: 1,      type: "snapshot",      config: CONFIG,    });    const themes = [      {        id: "nightfall",        name: "Nightfall",        appearance: "dark",        canvas: "#1a1b26",        accent: "#7aa2f7",      },    ] as const;     const published = applyServerConfigProjection(snapshot, {      version: 1,      type: "environmentThemesUpdated",      payload: { themes },    });    expect(Option.getOrThrow(published).config.environmentThemes).toEqual(themes);     // A machine that stops publishing has to clear the palettes, not freeze    // clients on the last set it sent.    const unpublished = applyServerConfigProjection(published, {      version: 1,      type: "environmentThemesUpdated",      payload: { themes: [] },    });    expect(Option.getOrThrow(unpublished).config.environmentThemes).toBeUndefined();  });   // A snapshot never carries published themes, so taking it wholesale would  // clear them on every reconnect and repaint anyone wearing one.  it("keeps published themes across a reconnect snapshot", () => {    const themes = [      {        id: "nightfall",        name: "Nightfall",        appearance: "dark",        canvas: "#1a1b26",        accent: "#7aa2f7",      },    ] as const;     const withThemes = applyServerConfigProjection(      applyServerConfigProjection(Option.none(), { version: 1, type: "snapshot", config: CONFIG }),      { version: 1, type: "environmentThemesUpdated", payload: { themes } },    );    expect(Option.getOrThrow(withThemes).config.environmentThemes).toEqual(themes);     const afterReconnect = applyServerConfigProjection(withThemes, {      version: 1,      type: "snapshot",      config: CONFIG,    });    expect(Option.getOrThrow(afterReconnect).config.environmentThemes).toEqual(themes);     // A server that predates the feature never sends another theme event, so    // carrying the set forward would leave a palette nothing can update.    const downgraded = applyServerConfigProjection(withThemes, {      version: 1,      type: "snapshot",      config: {        ...CONFIG,        environment: { capabilities: {} },      } as unknown as ServerConfig,    });    expect(Option.getOrThrow(downgraded).config.environmentThemes).toBeUndefined();  });   it("keeps a current welcome on ready and rejects a buffered welcome from the old session", () => {    const firstSession = session({} as WsRpcProtocolClient);

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