import {  defaultInstanceIdForDriver,  ProviderDriverKind,  type ProviderInstanceId,  type ProviderSessionRuntimeStatus,  type RuntimeMode,  type ThreadId,} from "@t3tools/contracts";import * as Context from "effect/Context";import * as DateTime from "effect/DateTime";import * as Effect from "effect/Effect";import * as Layer from "effect/Layer";import * as Option from "effect/Option";import * as Schema from "effect/Schema"; import {  ProviderSessionDirectoryPersistenceError,  ProviderSessionNotFoundError,  ProviderValidationError,} from "./Errors.ts";import * as ProviderSessionRuntime from "../persistence/ProviderSessionRuntime.ts"; export interface ProviderRuntimeBinding {  readonly threadId: ThreadId;  readonly provider: ProviderDriverKind;  /**   * Routing key for the configured provider instance that owns this   * session. The persistence layer promotes legacy null rows before   * exposing bindings; runtime callers must not infer this from `provider`.   */  readonly providerInstanceId?: ProviderInstanceId;  readonly adapterKey?: string;  readonly status?: ProviderSessionRuntimeStatus;  readonly resumeCursor?: unknown | null;  readonly runtimePayload?: unknown | null;  readonly runtimeMode?: RuntimeMode;} export interface ProviderRuntimeBindingWithMetadata extends ProviderRuntimeBinding {  readonly lastSeenAt: string;} export type ProviderSessionDirectoryReadError =  | ProviderSessionDirectoryPersistenceError  | ProviderSessionNotFoundError; export type ProviderSessionDirectoryWriteError =  | ProviderValidationError  | ProviderSessionDirectoryPersistenceError; export class ProviderSessionDirectory extends Context.Service<  ProviderSessionDirectory,  {    readonly upsert: (      binding: ProviderRuntimeBinding,    ) => Effect.Effect<void, ProviderSessionDirectoryWriteError>;    readonly getProvider: (      threadId: ThreadId,    ) => Effect.Effect<ProviderDriverKind, ProviderSessionDirectoryReadError>;    readonly getBinding: (      threadId: ThreadId,    ) => Effect.Effect<      Option.Option<ProviderRuntimeBinding>,      ProviderSessionDirectoryPersistenceError    >;    readonly listThreadIds: () => Effect.Effect<      ReadonlyArray<ThreadId>,      ProviderSessionDirectoryPersistenceError    >;    readonly listBindings: () => Effect.Effect<      ReadonlyArray<ProviderRuntimeBindingWithMetadata>,      ProviderSessionDirectoryPersistenceError    >;  }>()("t3/provider/ProviderSessionDirectory") {} const decodeProviderDriverKindValue = Schema.decodeUnknownEffect(ProviderDriverKind); function decodeProviderDriverKind(  providerName: string,  operation: string,): Effect.Effect<ProviderDriverKind, ProviderSessionDirectoryPersistenceError> {  return decodeProviderDriverKindValue(providerName).pipe(    Effect.mapError(      (cause) =>        new ProviderSessionDirectoryPersistenceError({          operation,          detail: `Unknown persisted provider '${providerName}'.`,          cause,        }),    ),  );} function isRecord(value: unknown): value is Record<string, unknown> {  return value !== null && typeof value === "object" && !Array.isArray(value);} function mergeRuntimePayload(  existing: unknown | null,  next: unknown | null | undefined,): unknown | null {  if (next === undefined) {    return existing ?? null;  }  if (isRecord(existing) && isRecord(next)) {    return { ...existing, ...next };  }  return next;} function toRuntimeBinding(  runtime: ProviderSessionRuntime.ProviderSessionRuntime,  operation: string,): Effect.Effect<ProviderRuntimeBindingWithMetadata, ProviderSessionDirectoryPersistenceError> {  return decodeProviderDriverKind(runtime.providerName, operation).pipe(    Effect.map(      (provider) =>        ({          threadId: runtime.threadId,          provider,          // Migration boundary: rows written before provider instances had a          // nullable id. Promote them here so runtime routing never has to          // infer an instance from its driver kind.          providerInstanceId: runtime.providerInstanceId ?? defaultInstanceIdForDriver(provider),          adapterKey: runtime.adapterKey,          runtimeMode: runtime.runtimeMode,          status: runtime.status,          resumeCursor: runtime.resumeCursor,          runtimePayload: runtime.runtimePayload,          lastSeenAt: runtime.lastSeenAt,        }) satisfies ProviderRuntimeBindingWithMetadata,    ),  );} export const make = Effect.gen(function* () {  const repository = yield* ProviderSessionRuntime.ProviderSessionRuntimeRepository;   const getBinding: ProviderSessionDirectory["Service"]["getBinding"] = (threadId) =>    repository.getByThreadId({ threadId }).pipe(      Effect.mapError(        (cause) =>          new ProviderSessionDirectoryPersistenceError({            operation: "ProviderSessionDirectory.getBinding:getByThreadId",            detail: "Failed to read the persisted provider session binding.",            cause,          }),      ),      Effect.flatMap((runtime) =>        Option.match(runtime, {          onNone: () => Effect.succeed(Option.none<ProviderRuntimeBinding>()),          onSome: (value) =>            toRuntimeBinding(value, "ProviderSessionDirectory.getBinding").pipe(              Effect.map(Option.some),            ),        }),      ),    );   const upsert: ProviderSessionDirectory["Service"]["upsert"] = Effect.fn(    "ProviderSessionDirectory.upsert",  )(function* (binding) {    const existing = yield* repository.getByThreadId({ threadId: binding.threadId }).pipe(      Effect.mapError(        (cause) =>          new ProviderSessionDirectoryPersistenceError({            operation: "ProviderSessionDirectory.upsert:getByThreadId",            detail: "Failed to read the existing provider session binding before upsert.",            cause,          }),      ),    );     const existingRuntime = Option.getOrUndefined(existing);    const resolvedThreadId = binding.threadId ?? existingRuntime?.threadId;    if (!resolvedThreadId) {      return yield* new ProviderValidationError({        operation: "ProviderSessionDirectory.upsert",        issue: "threadId must be a non-empty string.",      });    }     const now = DateTime.formatIso(yield* DateTime.now);    const providerChanged =      existingRuntime !== undefined && existingRuntime.providerName !== binding.provider;    const providerInstanceId =      binding.providerInstanceId ?? (!providerChanged ? existingRuntime?.providerInstanceId : null);    if (providerInstanceId === null || providerInstanceId === undefined) {      return yield* new ProviderValidationError({        operation: "ProviderSessionDirectory.upsert",        issue: "providerInstanceId is required for provider session runtime bindings.",      });    }    yield* repository      .upsert({        threadId: resolvedThreadId,        providerName: binding.provider,        providerInstanceId,        adapterKey:          binding.adapterKey ??          (providerChanged ? binding.provider : (existingRuntime?.adapterKey ?? binding.provider)),        runtimeMode: binding.runtimeMode ?? existingRuntime?.runtimeMode ?? "full-access",        status: binding.status ?? existingRuntime?.status ?? "running",        lastSeenAt: now,        resumeCursor:          binding.resumeCursor !== undefined            ? binding.resumeCursor            : (existingRuntime?.resumeCursor ?? null),        runtimePayload: mergeRuntimePayload(          existingRuntime?.runtimePayload ?? null,          binding.runtimePayload,        ),      })      .pipe(        Effect.mapError(          (cause) =>            new ProviderSessionDirectoryPersistenceError({              operation: "ProviderSessionDirectory.upsert:upsert",              detail: "Failed to persist the provider session binding.",              cause,            }),        ),      );  });   const getProvider: ProviderSessionDirectory["Service"]["getProvider"] = (threadId) =>    getBinding(threadId).pipe(      Effect.flatMap(        Option.match({          onSome: (value) => Effect.succeed(value.provider),          onNone: () =>            Effect.fail(              new ProviderSessionNotFoundError({                threadId,              }),            ),        }),      ),    );   const listThreadIds: ProviderSessionDirectory["Service"]["listThreadIds"] = () =>    repository.list().pipe(      Effect.mapError(        (cause) =>          new ProviderSessionDirectoryPersistenceError({            operation: "ProviderSessionDirectory.listThreadIds:list",            detail: "Failed to list persisted provider session bindings.",            cause,          }),      ),      Effect.map((rows) => rows.map((row) => row.threadId)),    );   const listBindings: ProviderSessionDirectory["Service"]["listBindings"] = () =>    repository.list().pipe(      Effect.mapError(        (cause) =>          new ProviderSessionDirectoryPersistenceError({            operation: "ProviderSessionDirectory.listBindings:list",            detail: "Failed to list persisted provider session bindings.",            cause,          }),      ),      Effect.flatMap((rows) =>        Effect.forEach(          rows,          (row) => toRuntimeBinding(row, "ProviderSessionDirectory.listBindings"),          { concurrency: "unbounded" },        ),      ),    );   return ProviderSessionDirectory.of({    upsert,    getProvider,    getBinding,    listThreadIds,    listBindings,  });}); export const layer = Layer.effect(ProviderSessionDirectory, make);