import { getOriginalFunction } from '@sentry/utils';
import { getClient } from '../exports.js';
import { convertIntegrationFnToClass, defineIntegration } from '../integration.js';

let originalFunctionToString;

const INTEGRATION_NAME = 'FunctionToString';

const SETUP_CLIENTS = new WeakMap();

const _functionToStringIntegration = (() => {
  return {
    name: INTEGRATION_NAME,
    setupOnce() {
      // eslint-disable-next-line @typescript-eslint/unbound-method
      originalFunctionToString = Function.prototype.toString;

      // intrinsics (like Function.prototype) might be immutable in some environments
      // e.g. Node with --frozen-intrinsics, XS (an embedded JavaScript engine) or SES (a JavaScript proposal)
      try {
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        Function.prototype.toString = function ( ...args) {
          const originalFunction = getOriginalFunction(this);
          const context =
            SETUP_CLIENTS.has(getClient() ) && originalFunction !== undefined ? originalFunction : this;
          return originalFunctionToString.apply(context, args);
        };
      } catch (e) {
        // ignore errors here, just don't patch this
      }
    },
    setup(client) {
      SETUP_CLIENTS.set(client, true);
    },
  };
}) ;

/**
 * Patch toString calls to return proper name for wrapped functions.
 *
 * ```js
 * Sentry.init({
 *   integrations: [
 *     functionToStringIntegration(),
 *   ],
 * });
 * ```
 */
const functionToStringIntegration = defineIntegration(_functionToStringIntegration);

/**
 * Patch toString calls to return proper name for wrapped functions.
 *
 * @deprecated Use `functionToStringIntegration()` instead.
 */
// eslint-disable-next-line deprecation/deprecation
const FunctionToString = convertIntegrationFnToClass(
  INTEGRATION_NAME,
  functionToStringIntegration,
) ;

// eslint-disable-next-line deprecation/deprecation

export { FunctionToString, functionToStringIntegration };
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