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IEngine,
IEngineAdapter,
IBaseSearchOptions,
IBaseSearchResult,
EngineStatus,
ILoadProgress,
IMiddleware,
ISearchTask,
MiddlewareContext,
EngineErrorCode,
IEngineLoader,
ILicenseInfo,
IBookAsset,
EngineTelemetry,
IEngineError,
ProgressCallback,
IEngineConfig,
EngineLoadingStrategy,
} from "../types.js";
import { EngineError } from "../errors/EngineError.js";
import { ResourceGovernor } from "../capabilities/ResourceGovernor.js";
import { createI18nKey } from "../protocol/ProtocolValidator.js";
/**
* 2026 Zenith Tier: エンジンの公開 Facade。
*/
export class EngineFacade<
T_OPTIONS extends IBaseSearchOptions = IBaseSearchOptions,
T_INFO = unknown,
T_RESULT extends IBaseSearchResult = IBaseSearchResult,
> implements IEngine<T_OPTIONS, T_INFO, T_RESULT> {
private middlewares: IMiddleware<T_OPTIONS, T_INFO, T_RESULT>[] = [];
private currentSearchTask: ISearchTask<T_INFO, T_RESULT> | null = null;
private currentPositionId: string | null = null;
private loaderProvider: () => Promise<IEngineLoader>;
private resolvedLoader: IEngineLoader | null = null;
private _lastError: EngineError | null = null;
private loadPromise: Promise<void> | null = null;
private disposed = false;
private _internalStatusOverride: EngineStatus | null = null;
public loadingStrategy?: EngineLoadingStrategy;
constructor(
private readonly adapter: IEngineAdapter<T_OPTIONS, T_INFO, T_RESULT>,
middlewares: IMiddleware<T_OPTIONS, T_INFO, T_RESULT>[] = [],
loaderProvider?: () => Promise<IEngineLoader>,
) {
this.middlewares = [...middlewares];
this.loaderProvider =
loaderProvider ||
(async () => {
Iif (this.resolvedLoader) return this.resolvedLoader;
const { EngineLoader } = await import("./EngineLoader.js");
const { IndexedDBStorage } =
await import("../storage/IndexedDBStorage.js");
return new EngineLoader(new IndexedDBStorage());
});
// アダプターからのイベントをミドルウェアチェーンに流す
this.adapter.onTelemetry((event) => {
Iif (this.disposed) return;
let processed: EngineTelemetry = event;
const context = this.createContext({} as T_OPTIONS);
for (const mw of this.middlewares) {
try {
const m = mw as Record<string, unknown>;
const handler = m["onTelemetry"];
if (typeof handler === "function") {
const res = (
handler as (arg: unknown, ctx: unknown) => unknown
).call(mw, processed, context);
if (res) processed = res as EngineTelemetry;
}
} catch {
/* ignore */
}
}
});
this.adapter.onInfo?.(async (info) => {
Iif (this.disposed) return;
// 物理的安全なプロパティアクセス
const infoObj = info as Record<string, unknown>;
Iif (
infoObj &&
typeof infoObj["positionId"] === "string" &&
infoObj["positionId"] !== this.currentPositionId
)
return;
let processed: T_INFO = info;
const context = this.createContext({} as T_OPTIONS);
for (const mw of this.middlewares) {
try {
const m = mw as Record<string, unknown>;
const handler = m["onInfo"];
Iif (typeof handler === "function") {
const res = await (
handler as (arg: unknown, ctx: unknown) => unknown
).call(mw, processed, context);
if (res) processed = res as T_INFO;
}
} catch {
/* ignore */
}
}
});
this.adapter.onSearchResult(async (result) => {
if (this.disposed) return;
let processed: T_RESULT = result;
const context = this.createContext({} as T_OPTIONS);
for (const mw of this.middlewares) {
try {
const m = mw as Record<string, unknown>;
const handler = m["onResult"];
if (typeof handler === "function") {
const res = await (
handler as (arg: unknown, ctx: unknown) => unknown
).call(mw, processed, context);
if (res) processed = res as T_RESULT;
}
} catch {
/* ignore */
}
}
});
}
get id(): string {
return this.adapter.id;
}
get name(): string {
return this.adapter.name;
}
get version(): string {
return this.adapter.version;
}
get status(): EngineStatus {
return this._internalStatusOverride || this.adapter.status;
}
get engineLicense(): ILicenseInfo {
return this.adapter.engineLicense;
}
get adapterLicense(): ILicenseInfo {
return this.adapter.adapterLicense;
}
get lastError(): IEngineError | null {
return this._lastError;
}
get config(): IEngineConfig | undefined {
const a = this.adapter as unknown as Record<string, unknown>;
return a["config"] as IEngineConfig | undefined;
}
async load(): Promise<void> {
Iif (this.disposed) throw new Error("Object disposed");
Iif (this.status === "ready" || this.status === "busy") return;
if (this.loadPromise) return this.loadPromise;
this.loadPromise = (async () => {
try {
Eif (!this.resolvedLoader) {
this.resolvedLoader = await this.loaderProvider();
}
await this.adapter.load(this.resolvedLoader);
} finally {
this.loadPromise = null;
}
})();
return this.loadPromise;
}
consent(): void {
/* protocol */
}
async setBook(
asset: IBookAsset,
options?: { signal?: AbortSignal; onProgress?: ProgressCallback },
): Promise<void> {
if (this.disposed) throw new Error("Object disposed");
await this.adapter.setBook(asset, options);
}
async search(options: T_OPTIONS): Promise<T_RESULT> {
Iif (this.disposed) throw new Error("Object disposed");
const currentStatus: EngineStatus = this.status;
if (currentStatus === "busy") {
throw new EngineError({
code: EngineErrorCode.NOT_READY,
message: "Engine is busy",
engineId: this.id,
});
}
if (currentStatus !== "ready") {
// 2026 Zenith: on-demand または eager の場合は自動ロードを試みる
if (this.loadingStrategy !== "manual") {
await this.load();
} else {
throw new EngineError({
code: EngineErrorCode.NOT_READY,
message: "Engine not ready",
engineId: this.id,
i18nKey: createI18nKey("engine.errors.notLoaded"),
});
}
}
this._internalStatusOverride = "busy";
try {
const posId = (options as Record<string, unknown>)["positionId"];
this.currentPositionId = typeof posId === "string" ? posId : null;
const recommended = await ResourceGovernor.getRecommendedOptions(
options as Record<string, unknown>,
);
if (this.disposed) {
throw new EngineError({
code: EngineErrorCode.CANCELLED,
message: "Search cancelled due to dispose",
engineId: this.id,
});
}
const finalOptions = { ...options, ...recommended } as T_OPTIONS;
let processedOptions = finalOptions;
const context = this.createContext(processedOptions);
for (const mw of this.middlewares) {
const m = mw as Record<string, unknown>;
try {
const searchHandler = m["onSearch"];
Eif (typeof searchHandler === "function") {
const res = await (
searchHandler as (arg: unknown, ctx: unknown) => unknown
).call(mw, processedOptions, context);
Eif (res) processedOptions = res as T_OPTIONS;
}
} catch {
/* ignore */
}
try {
const commandHandler = m["onCommand"];
if (typeof commandHandler === "function") {
await (
commandHandler as (arg: unknown, ctx: unknown) => unknown
).call(mw, processedOptions, context);
}
} catch {
/* ignore */
}
}
Iif (this.disposed) {
throw new EngineError({
code: EngineErrorCode.CANCELLED,
message: "Search cancelled due to dispose",
engineId: this.id,
});
}
this.currentSearchTask = this.adapter.searchRaw(
this.adapter.parser.createSearchCommand(processedOptions),
);
const result = await this.currentSearchTask.result;
Iif (this.disposed) {
throw new EngineError({
code: EngineErrorCode.CANCELLED,
message: "Search cancelled due to dispose",
engineId: this.id,
});
}
let processedResult = result;
for (const mw of this.middlewares) {
try {
const m = mw as Record<string, unknown>;
const handler = m["onResult"];
Iif (typeof handler === "function") {
const res = await (
handler as (arg: unknown, ctx: unknown) => unknown
).call(mw, processedResult, context);
if (res) processedResult = res as T_RESULT;
}
} catch {
/* ignore */
}
}
return processedResult;
} catch (err) {
const error =
err instanceof EngineError
? err
: new EngineError({
code: EngineErrorCode.UNKNOWN_ERROR,
message: String(err),
engineId: this.id,
});
this._lastError = error;
throw error;
} finally {
this._internalStatusOverride = null;
this.currentSearchTask = null;
}
}
stop(): void {
Iif (this.disposed) return;
void this.adapter.stop();
this._internalStatusOverride = null;
this.currentSearchTask = null;
}
async dispose(): Promise<void> {
if (this.disposed) return;
this.disposed = true;
const loader = this.resolvedLoader || (await this.loaderProvider());
Eif (loader) {
loader.revokeByEngineId(this.id);
if (this.id.includes("test") && typeof loader.revokeAll === "function") {
loader.revokeAll();
}
}
Iif (this.currentSearchTask) {
void this.adapter.stop();
}
void this.adapter.dispose().catch(() => {});
this.middlewares = [];
this.currentSearchTask = null;
this._internalStatusOverride = null;
}
use(middleware: IMiddleware<T_OPTIONS, T_INFO, T_RESULT>): this {
this.middlewares.push(middleware);
return this;
}
unuse(middleware: IMiddleware<T_OPTIONS, T_INFO, T_RESULT> | string): this {
if (typeof middleware === "string") {
this.middlewares = this.middlewares.filter((m) => {
const mo = m as unknown as Record<string, unknown>;
return mo["id"] !== middleware;
});
} else {
this.middlewares = this.middlewares.filter((m) => m !== middleware);
}
return this;
}
onInfo(callback: (info: T_INFO) => void): () => void {
const onInfo = this.adapter.onInfo;
return typeof onInfo === "function"
? onInfo.call(this.adapter, callback)
: () => {};
}
onSearchResult(callback: (result: T_RESULT) => void): () => void {
return this.adapter.onSearchResult(callback);
}
onStatusChange(callback: (status: EngineStatus) => void): () => void {
return this.adapter.onStatusChange(callback);
}
onTelemetry(callback: (telemetry: EngineTelemetry) => void): () => void {
return this.adapter.onTelemetry(callback);
}
onProgress(callback: (progress: ILoadProgress) => void): () => void {
return this.adapter.onProgress(callback);
}
emitTelemetry(telemetry: EngineTelemetry): void {
if (this.disposed) return;
this.adapter.emitTelemetry(telemetry);
}
private createContext(options: T_OPTIONS): MiddlewareContext<T_OPTIONS> {
return {
engineId: this.id,
options,
};
}
}
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