import { logger, getEventDescription, isMatchingPattern } from '@sentry/utils';
import { IS_DEBUG_BUILD } from '../flags.js';

// "Script error." is hard coded into browsers for errors that it can't read.
// this is the result of a script being pulled in from an external domain and CORS.
var DEFAULT_IGNORE_ERRORS = [/^Script error\.?$/, /^Javascript error: Script error\.? on line 0$/];

/** Options for the InboundFilters integration */

/** Inbound filters configurable by the user */
class InboundFilters  {
  /**
   * @inheritDoc
   */
   static __initStatic() {this.id = 'InboundFilters';}

  /**
   * @inheritDoc
   */
   __init() {this.name = InboundFilters.id;}

   constructor(  _options = {}) {;this._options = _options;InboundFilters.prototype.__init.call(this);}

  /**
   * @inheritDoc
   */
   setupOnce(addGlobalEventProcessor, getCurrentHub) {
    var eventProcess = (event) => {
      var hub = getCurrentHub();
      if (hub) {
        var self = hub.getIntegration(InboundFilters);
        if (self) {
          var client = hub.getClient();
          var clientOptions = client ? client.getOptions() : {};
          var options = _mergeOptions(self._options, clientOptions);
          return _shouldDropEvent(event, options) ? null : event;
        }
      }
      return event;
    };

    eventProcess.id = this.name;
    addGlobalEventProcessor(eventProcess);
  }
} InboundFilters.__initStatic();

/** JSDoc */
function _mergeOptions(
  internalOptions = {},
  clientOptions = {},
) {
  return {
    allowUrls: [...(internalOptions.allowUrls || []), ...(clientOptions.allowUrls || [])],
    denyUrls: [...(internalOptions.denyUrls || []), ...(clientOptions.denyUrls || [])],
    ignoreErrors: [
      ...(internalOptions.ignoreErrors || []),
      ...(clientOptions.ignoreErrors || []),
      ...DEFAULT_IGNORE_ERRORS,
    ],
    ignoreInternal: internalOptions.ignoreInternal !== undefined ? internalOptions.ignoreInternal : true,
  };
}

/** JSDoc */
function _shouldDropEvent(event, options) {
  if (options.ignoreInternal && _isSentryError(event)) {
    IS_DEBUG_BUILD &&
      logger.warn(`Event dropped due to being internal Sentry Error.\nEvent: ${getEventDescription(event)}`);
    return true;
  }
  if (_isIgnoredError(event, options.ignoreErrors)) {
    IS_DEBUG_BUILD &&
      logger.warn(
        `Event dropped due to being matched by \`ignoreErrors\` option.\nEvent: ${getEventDescription(event)}`,
      );
    return true;
  }
  if (_isDeniedUrl(event, options.denyUrls)) {
    IS_DEBUG_BUILD &&
      logger.warn(
        `Event dropped due to being matched by \`denyUrls\` option.\nEvent: ${getEventDescription(
          event,
        )}.\nUrl: ${_getEventFilterUrl(event)}`,
      );
    return true;
  }
  if (!_isAllowedUrl(event, options.allowUrls)) {
    IS_DEBUG_BUILD &&
      logger.warn(
        `Event dropped due to not being matched by \`allowUrls\` option.\nEvent: ${getEventDescription(
          event,
        )}.\nUrl: ${_getEventFilterUrl(event)}`,
      );
    return true;
  }
  return false;
}

function _isIgnoredError(event, ignoreErrors) {
  if (!ignoreErrors || !ignoreErrors.length) {
    return false;
  }

  return _getPossibleEventMessages(event).some(message =>
    ignoreErrors.some(pattern => isMatchingPattern(message, pattern)),
  );
}

function _isDeniedUrl(event, denyUrls) {
  // TODO: Use Glob instead?
  if (!denyUrls || !denyUrls.length) {
    return false;
  }
  var url = _getEventFilterUrl(event);
  return !url ? false : denyUrls.some(pattern => isMatchingPattern(url, pattern));
}

function _isAllowedUrl(event, allowUrls) {
  // TODO: Use Glob instead?
  if (!allowUrls || !allowUrls.length) {
    return true;
  }
  var url = _getEventFilterUrl(event);
  return !url ? true : allowUrls.some(pattern => isMatchingPattern(url, pattern));
}

function _getPossibleEventMessages(event) {
  if (event.message) {
    return [event.message];
  }
  if (event.exception) {
    try {
      const { type = '', value = '' } = (event.exception.values && event.exception.values[0]) || {};
      return [`${value}`, `${type}: ${value}`];
    } catch (oO) {
      IS_DEBUG_BUILD && logger.error(`Cannot extract message for event ${getEventDescription(event)}`);
      return [];
    }
  }
  return [];
}

function _isSentryError(event) {
  try {
    // @ts-ignore can't be a sentry error if undefined
        return event.exception.values[0].type === 'SentryError';
  } catch (e) {
    // ignore
  }
  return false;
}

function _getLastValidUrl(frames = []) {
  for (let i = frames.length - 1; i >= 0; i--) {
    var frame = frames[i];

    if (frame && frame.filename !== '<anonymous>' && frame.filename !== '[native code]') {
      return frame.filename || null;
    }
  }

  return null;
}

function _getEventFilterUrl(event) {
  try {
    let frames;
    try {
      // @ts-ignore we only care about frames if the whole thing here is defined
      frames = event.exception.values[0].stacktrace.frames;
    } catch (e) {
      // ignore
    }
    return frames ? _getLastValidUrl(frames) : null;
  } catch (oO) {
    IS_DEBUG_BUILD && logger.error(`Cannot extract url for event ${getEventDescription(event)}`);
    return null;
  }
}

export { InboundFilters, _mergeOptions, _shouldDropEvent };
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