import * as Context from "effect/Context";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 FileSystem from "effect/FileSystem";import * as Layer from "effect/Layer";import * as PubSub from "effect/PubSub";import * as Ref from "effect/Ref";import * as Schedule from "effect/Schedule";import * as Scope from "effect/Scope";import * as Stream from "effect/Stream";import * as SynchronizedRef from "effect/SynchronizedRef";import type {  GitManagerServiceError,  VcsStatusInput,  VcsStatusLocalResult,  VcsStatusRemoteResult,  VcsStatusResult,  VcsStatusStreamEvent,} from "@t3tools/contracts";import { mergeGitStatusParts } from "@t3tools/shared/git"; import * as GitWorkflowService from "../git/GitWorkflowService.ts"; const DEFAULT_VCS_STATUS_REFRESH_INTERVAL = Duration.seconds(30);const VCS_STATUS_REFRESH_FAILURE_BASE_DELAY = Duration.seconds(30);const VCS_STATUS_REFRESH_FAILURE_MAX_DELAY = Duration.minutes(15); interface VcsStatusChange {  readonly cwd: string;  readonly event: VcsStatusStreamEvent;} interface CachedValue<T> {  readonly fingerprint: string;  readonly value: T;} interface CachedVcsStatus {  readonly local: CachedValue<VcsStatusLocalResult> | null;  readonly remote: CachedValue<VcsStatusRemoteResult | null> | null;} interface ActiveRemotePoller {  readonly fiber: Fiber.Fiber<void, never>;  readonly subscriberCount: number;} interface StreamStatusOptions {  readonly automaticRemoteRefreshInterval?: Effect.Effect<Duration.Duration, never>;} export function remoteRefreshFailureDelay(  consecutiveFailures: number,  configuredInterval: Duration.Duration,) {  const exponent = Math.max(0, consecutiveFailures - 1);  const backoffMs =    Duration.toMillis(VCS_STATUS_REFRESH_FAILURE_BASE_DELAY) * Math.pow(2, exponent);  const cappedBackoff = Duration.min(    Duration.millis(backoffMs),    VCS_STATUS_REFRESH_FAILURE_MAX_DELAY,  );  return Duration.max(configuredInterval, cappedBackoff);} export interface VcsStatusBroadcasterShape {  readonly getStatus: (    input: VcsStatusInput,  ) => Effect.Effect<VcsStatusResult, GitManagerServiceError>;  readonly refreshLocalStatus: (    cwd: string,  ) => Effect.Effect<VcsStatusLocalResult, GitManagerServiceError>;  readonly refreshStatus: (cwd: string) => Effect.Effect<VcsStatusResult, GitManagerServiceError>;  readonly streamStatus: (    input: VcsStatusInput,    options?: StreamStatusOptions,  ) => Stream.Stream<VcsStatusStreamEvent, GitManagerServiceError>;} export class VcsStatusBroadcaster extends Context.Service<  VcsStatusBroadcaster,  VcsStatusBroadcasterShape>()("t3/vcs/VcsStatusBroadcaster") {} function fingerprintStatusPart(status: unknown): string {  return JSON.stringify(status);} const normalizeCwd = (cwd: string) =>  Effect.service(FileSystem.FileSystem).pipe(    Effect.flatMap((fs) => fs.realPath(cwd)),    Effect.orElseSucceed(() => cwd),  ); export const layer = Layer.effect(  VcsStatusBroadcaster,  Effect.gen(function* () {    const workflow = yield* GitWorkflowService.GitWorkflowService;    const fs = yield* FileSystem.FileSystem;    const changesPubSub = yield* Effect.acquireRelease(      PubSub.unbounded<VcsStatusChange>(),      (pubsub) => PubSub.shutdown(pubsub),    );    const broadcasterScope = yield* Effect.acquireRelease(Scope.make(), (scope) =>      Scope.close(scope, Exit.void),    );    const cacheRef = yield* Ref.make(new Map<string, CachedVcsStatus>());    const pollersRef = yield* SynchronizedRef.make(new Map<string, ActiveRemotePoller>());     const getCachedStatus = Effect.fn("VcsStatusBroadcaster.getCachedStatus")(function* (      cwd: string,    ) {      return yield* Ref.get(cacheRef).pipe(Effect.map((cache) => cache.get(cwd) ?? null));    });     const updateCachedLocalStatus = Effect.fn("VcsStatusBroadcaster.updateCachedLocalStatus")(      function* (cwd: string, local: VcsStatusLocalResult, options?: { publish?: boolean }) {        const nextLocal = {          fingerprint: fingerprintStatusPart(local),          value: local,        } satisfies CachedValue<VcsStatusLocalResult>;        const shouldPublish = yield* Ref.modify(cacheRef, (cache) => {          const previous = cache.get(cwd) ?? { local: null, remote: null };          const nextCache = new Map(cache);          nextCache.set(cwd, {            ...previous,            local: nextLocal,          });          return [previous.local?.fingerprint !== nextLocal.fingerprint, nextCache] as const;        });         if (options?.publish && shouldPublish) {          yield* PubSub.publish(changesPubSub, {            cwd,            event: {              _tag: "localUpdated",              local,            },          });        }         return local;      },    );     const updateCachedRemoteStatus = Effect.fn("VcsStatusBroadcaster.updateCachedRemoteStatus")(      function* (        cwd: string,        remote: VcsStatusRemoteResult | null,        options?: { publish?: boolean },      ) {        const nextRemote = {          fingerprint: fingerprintStatusPart(remote),          value: remote,        } satisfies CachedValue<VcsStatusRemoteResult | null>;        const shouldPublish = yield* Ref.modify(cacheRef, (cache) => {          const previous = cache.get(cwd) ?? { local: null, remote: null };          const nextCache = new Map(cache);          nextCache.set(cwd, {            ...previous,            remote: nextRemote,          });          return [previous.remote?.fingerprint !== nextRemote.fingerprint, nextCache] as const;        });         if (options?.publish && shouldPublish) {          yield* PubSub.publish(changesPubSub, {            cwd,            event: {              _tag: "remoteUpdated",              remote,            },          });        }         return remote;      },    );     const loadLocalStatus = Effect.fn("VcsStatusBroadcaster.loadLocalStatus")(function* (      cwd: string,    ) {      const local = yield* workflow.localStatus({ cwd });      return yield* updateCachedLocalStatus(cwd, local);    });     const loadRemoteStatus = Effect.fn("VcsStatusBroadcaster.loadRemoteStatus")(function* (      cwd: string,    ) {      const remote = yield* workflow.remoteStatus({ cwd });      return yield* updateCachedRemoteStatus(cwd, remote);    });     const getOrLoadLocalStatus = Effect.fn("VcsStatusBroadcaster.getOrLoadLocalStatus")(function* (      cwd: string,    ) {      const cached = yield* getCachedStatus(cwd);      if (cached?.local) {        return cached.local.value;      }      return yield* loadLocalStatus(cwd);    });     const getOrLoadRemoteStatus = Effect.fn("VcsStatusBroadcaster.getOrLoadRemoteStatus")(      function* (cwd: string) {        const cached = yield* getCachedStatus(cwd);        if (cached?.remote) {          return cached.remote.value;        }        return yield* loadRemoteStatus(cwd);      },    );     const withFileSystem = Effect.provideService(FileSystem.FileSystem, fs);     const getStatus: VcsStatusBroadcasterShape["getStatus"] = Effect.fn(      "VcsStatusBroadcaster.getStatus",    )(function* (input) {      const cwd = yield* withFileSystem(normalizeCwd(input.cwd));      const [local, remote] = yield* Effect.all([        getOrLoadLocalStatus(cwd),        getOrLoadRemoteStatus(cwd),      ]);      return mergeGitStatusParts(local, remote);    });     const refreshLocalStatus: VcsStatusBroadcasterShape["refreshLocalStatus"] = Effect.fn(      "VcsStatusBroadcaster.refreshLocalStatus",    )(function* (rawCwd) {      const cwd = yield* withFileSystem(normalizeCwd(rawCwd));      yield* workflow.invalidateLocalStatus(cwd);      const local = yield* workflow.localStatus({ cwd });      return yield* updateCachedLocalStatus(cwd, local, { publish: true });    });     const refreshRemoteStatus = Effect.fn("VcsStatusBroadcaster.refreshRemoteStatus")(function* (      cwd: string,    ) {      yield* workflow.invalidateRemoteStatus(cwd);      const remote = yield* workflow.remoteStatus({ cwd });      return yield* updateCachedRemoteStatus(cwd, remote, { publish: true });    });     const refreshStatus: VcsStatusBroadcasterShape["refreshStatus"] = Effect.fn(      "VcsStatusBroadcaster.refreshStatus",    )(function* (rawCwd) {      const cwd = yield* withFileSystem(normalizeCwd(rawCwd));      const [local, remote] = yield* Effect.all([        refreshLocalStatus(cwd),        refreshRemoteStatus(cwd),      ]);      return mergeGitStatusParts(local, remote);    });     const makeRemoteRefreshLoop = (      cwd: string,      automaticRemoteRefreshInterval: Effect.Effect<Duration.Duration, never>,      refreshImmediately: boolean,    ) => {      return Effect.gen(function* () {        const consecutiveFailuresRef = yield* Ref.make(0);        const refreshRemoteStatusIfEnabled = Effect.gen(function* () {          const configuredInterval = yield* automaticRemoteRefreshInterval;          const activeInterval = Duration.isZero(configuredInterval)            ? DEFAULT_VCS_STATUS_REFRESH_INTERVAL            : configuredInterval;          if (Duration.isZero(configuredInterval)) {            return activeInterval;          }           const exit = yield* refreshRemoteStatus(cwd).pipe(Effect.exit);          if (Exit.isSuccess(exit)) {            yield* Ref.set(consecutiveFailuresRef, 0);            return activeInterval;          }           const consecutiveFailures = yield* Ref.updateAndGet(            consecutiveFailuresRef,            (count) => count + 1,          );          const nextDelay = remoteRefreshFailureDelay(consecutiveFailures, activeInterval);          yield* Effect.logWarning("VCS remote status refresh failed", {            cwd,            detail: exit.cause.toString(),            consecutiveFailures,            nextDelayMs: Duration.toMillis(nextDelay),          });          return nextDelay;        });         if (!refreshImmediately) {          const configuredInterval = yield* automaticRemoteRefreshInterval;          yield* Effect.sleep(            Duration.isZero(configuredInterval)              ? DEFAULT_VCS_STATUS_REFRESH_INTERVAL              : configuredInterval,          );        }         return yield* refreshRemoteStatusIfEnabled.pipe(          Effect.repeat(            Schedule.identity<Duration.Duration>().pipe(              Schedule.addDelay((delay) => Effect.succeed(delay)),            ),          ),          Effect.asVoid,        );      });    };     const retainRemotePoller = Effect.fn("VcsStatusBroadcaster.retainRemotePoller")(function* (      cwd: string,      automaticRemoteRefreshInterval: Effect.Effect<Duration.Duration, never>,      refreshImmediately: boolean,    ) {      yield* SynchronizedRef.modifyEffect(pollersRef, (activePollers) => {        const existing = activePollers.get(cwd);        if (existing) {          const nextPollers = new Map(activePollers);          nextPollers.set(cwd, {            ...existing,            subscriberCount: existing.subscriberCount + 1,          });          return Effect.succeed([undefined, nextPollers] as const);        }         return makeRemoteRefreshLoop(cwd, automaticRemoteRefreshInterval, refreshImmediately).pipe(          Effect.forkIn(broadcasterScope),          Effect.map((fiber) => {            const nextPollers = new Map(activePollers);            nextPollers.set(cwd, {              fiber,              subscriberCount: 1,            });            return [undefined, nextPollers] as const;          }),        );      });    });     const releaseRemotePoller = Effect.fn("VcsStatusBroadcaster.releaseRemotePoller")(function* (      cwd: string,    ) {      const pollerToInterrupt = yield* SynchronizedRef.modify(pollersRef, (activePollers) => {        const existing = activePollers.get(cwd);        if (!existing) {          return [null, activePollers] as const;        }         if (existing.subscriberCount > 1) {          const nextPollers = new Map(activePollers);          nextPollers.set(cwd, {            ...existing,            subscriberCount: existing.subscriberCount - 1,          });          return [null, nextPollers] as const;        }         const nextPollers = new Map(activePollers);        nextPollers.delete(cwd);        return [existing.fiber, nextPollers] as const;      });       if (pollerToInterrupt) {        yield* Fiber.interrupt(pollerToInterrupt).pipe(Effect.ignore);      }    });     const streamStatus: VcsStatusBroadcasterShape["streamStatus"] = (input, options) =>      Stream.unwrap(        Effect.gen(function* () {          const cwd = yield* withFileSystem(normalizeCwd(input.cwd));          const subscription = yield* PubSub.subscribe(changesPubSub);          const initialLocal = yield* getOrLoadLocalStatus(cwd);          const cachedStatus = yield* getCachedStatus(cwd);          const initialRemote = cachedStatus?.remote?.value ?? null;          yield* retainRemotePoller(            cwd,            options?.automaticRemoteRefreshInterval ??              Effect.succeed(DEFAULT_VCS_STATUS_REFRESH_INTERVAL),            cachedStatus?.remote === null || cachedStatus?.remote === undefined,          );           const release = releaseRemotePoller(cwd).pipe(Effect.ignore, Effect.asVoid);           return Stream.concat(            Stream.make({              _tag: "snapshot" as const,              local: initialLocal,              remote: initialRemote,            }),            Stream.fromSubscription(subscription).pipe(              Stream.filter((event) => event.cwd === cwd),              Stream.map((event) => event.event),            ),          ).pipe(Stream.ensuring(release));        }),      );     return VcsStatusBroadcaster.of({      getStatus,      refreshLocalStatus,      refreshStatus,      streamStatus,    });  }),);