// src/Interceptor.ts
import { Logger } from "@open-draft/logger";
import { Emitter } from "strict-event-emitter";
var INTERNAL_REQUEST_ID_HEADER_NAME = "x-interceptors-internal-request-id";
function getGlobalSymbol(symbol) {
  return (
    // @ts-ignore https://github.com/Microsoft/TypeScript/issues/24587
    globalThis[symbol] || void 0
  );
}
function setGlobalSymbol(symbol, value) {
  globalThis[symbol] = value;
}
function deleteGlobalSymbol(symbol) {
  delete globalThis[symbol];
}
var InterceptorReadyState = /* @__PURE__ */ ((InterceptorReadyState2) => {
  InterceptorReadyState2["INACTIVE"] = "INACTIVE";
  InterceptorReadyState2["APPLYING"] = "APPLYING";
  InterceptorReadyState2["APPLIED"] = "APPLIED";
  InterceptorReadyState2["DISPOSING"] = "DISPOSING";
  InterceptorReadyState2["DISPOSED"] = "DISPOSED";
  return InterceptorReadyState2;
})(InterceptorReadyState || {});
var Interceptor = class {
  constructor(symbol) {
    this.symbol = symbol;
    this.readyState = "INACTIVE" /* INACTIVE */;
    this.emitter = new Emitter();
    this.subscriptions = [];
    this.logger = new Logger(symbol.description);
    this.emitter.setMaxListeners(0);
    this.logger.info("constructing the interceptor...");
  }
  /**
   * Determine if this interceptor can be applied
   * in the current environment.
   */
  checkEnvironment() {
    return true;
  }
  /**
   * Apply this interceptor to the current process.
   * Returns an already running interceptor instance if it's present.
   */
  apply() {
    const logger = this.logger.extend("apply");
    logger.info("applying the interceptor...");
    if (this.readyState === "APPLIED" /* APPLIED */) {
      logger.info("intercepted already applied!");
      return;
    }
    const shouldApply = this.checkEnvironment();
    if (!shouldApply) {
      logger.info("the interceptor cannot be applied in this environment!");
      return;
    }
    this.readyState = "APPLYING" /* APPLYING */;
    const runningInstance = this.getInstance();
    if (runningInstance) {
      logger.info("found a running instance, reusing...");
      this.on = (event, listener) => {
        logger.info('proxying the "%s" listener', event);
        runningInstance.emitter.addListener(event, listener);
        this.subscriptions.push(() => {
          runningInstance.emitter.removeListener(event, listener);
          logger.info('removed proxied "%s" listener!', event);
        });
        return this;
      };
      this.readyState = "APPLIED" /* APPLIED */;
      return;
    }
    logger.info("no running instance found, setting up a new instance...");
    this.setup();
    this.setInstance();
    this.readyState = "APPLIED" /* APPLIED */;
  }
  /**
   * Setup the module augments and stubs necessary for this interceptor.
   * This method is not run if there's a running interceptor instance
   * to prevent instantiating an interceptor multiple times.
   */
  setup() {
  }
  /**
   * Listen to the interceptor's public events.
   */
  on(event, listener) {
    const logger = this.logger.extend("on");
    if (this.readyState === "DISPOSING" /* DISPOSING */ || this.readyState === "DISPOSED" /* DISPOSED */) {
      logger.info("cannot listen to events, already disposed!");
      return this;
    }
    logger.info('adding "%s" event listener:', event, listener);
    this.emitter.on(event, listener);
    return this;
  }
  once(event, listener) {
    this.emitter.once(event, listener);
    return this;
  }
  off(event, listener) {
    this.emitter.off(event, listener);
    return this;
  }
  removeAllListeners(event) {
    this.emitter.removeAllListeners(event);
    return this;
  }
  /**
   * Disposes of any side-effects this interceptor has introduced.
   */
  dispose() {
    const logger = this.logger.extend("dispose");
    if (this.readyState === "DISPOSED" /* DISPOSED */) {
      logger.info("cannot dispose, already disposed!");
      return;
    }
    logger.info("disposing the interceptor...");
    this.readyState = "DISPOSING" /* DISPOSING */;
    if (!this.getInstance()) {
      logger.info("no interceptors running, skipping dispose...");
      return;
    }
    this.clearInstance();
    logger.info("global symbol deleted:", getGlobalSymbol(this.symbol));
    if (this.subscriptions.length > 0) {
      logger.info("disposing of %d subscriptions...", this.subscriptions.length);
      for (const dispose of this.subscriptions) {
        dispose();
      }
      this.subscriptions = [];
      logger.info("disposed of all subscriptions!", this.subscriptions.length);
    }
    this.emitter.removeAllListeners();
    logger.info("destroyed the listener!");
    this.readyState = "DISPOSED" /* DISPOSED */;
  }
  getInstance() {
    var _a;
    const instance = getGlobalSymbol(this.symbol);
    this.logger.info("retrieved global instance:", (_a = instance == null ? void 0 : instance.constructor) == null ? void 0 : _a.name);
    return instance;
  }
  setInstance() {
    setGlobalSymbol(this.symbol, this);
    this.logger.info("set global instance!", this.symbol.description);
  }
  clearInstance() {
    deleteGlobalSymbol(this.symbol);
    this.logger.info("cleared global instance!", this.symbol.description);
  }
};

// src/createRequestId.ts
function createRequestId() {
  return Math.random().toString(16).slice(2);
}

// src/utils/isPropertyAccessible.ts
function isPropertyAccessible(obj, key) {
  try {
    obj[key];
    return true;
  } catch (e) {
    return false;
  }
}

// src/utils/responseUtils.ts
var RESPONSE_STATUS_CODES_WITHOUT_BODY = /* @__PURE__ */ new Set([
  101,
  103,
  204,
  205,
  304
]);
var RESPONSE_STATUS_CODES_WITH_REDIRECT = /* @__PURE__ */ new Set([
  301,
  302,
  303,
  307,
  308
]);
function isResponseWithoutBody(status) {
  return RESPONSE_STATUS_CODES_WITHOUT_BODY.has(status);
}
function createServerErrorResponse(body) {
  return new Response(
    JSON.stringify(
      body instanceof Error ? {
        name: body.name,
        message: body.message,
        stack: body.stack
      } : body
    ),
    {
      status: 500,
      statusText: "Unhandled Exception",
      headers: {
        "Content-Type": "application/json"
      }
    }
  );
}
function isResponseError(response) {
  return isPropertyAccessible(response, "type") && response.type === "error";
}

export {
  INTERNAL_REQUEST_ID_HEADER_NAME,
  getGlobalSymbol,
  deleteGlobalSymbol,
  InterceptorReadyState,
  Interceptor,
  createRequestId,
  isPropertyAccessible,
  RESPONSE_STATUS_CODES_WITHOUT_BODY,
  RESPONSE_STATUS_CODES_WITH_REDIRECT,
  isResponseWithoutBody,
  createServerErrorResponse,
  isResponseError
};
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