import { _optionalChain } from '@sentry/utils';
import { isThenable } from '@sentry/utils';
import { constructWebpackConfigFunction } from './webpack.js';

let showedExportModeTunnelWarning = false;

/**
 * Add Sentry options to the config to be exported from the user's `next.config.js` file.
 *
 * @param exportedUserNextConfig The existing config to be exported prior to adding Sentry
 * @param userSentryWebpackPluginOptions Configuration for SentryWebpackPlugin
 * @param sentryOptions Optional additional options to add as alternative to `sentry` property of config
 * @returns The modified config to be exported
 */
function withSentryConfig(
  exportedUserNextConfig = {},
  userSentryWebpackPluginOptions = {},
  sentryOptions,
) {
  if (typeof exportedUserNextConfig === 'function') {
    return function ( ...webpackConfigFunctionArgs) {
      const maybeUserNextConfigObject = exportedUserNextConfig.apply(
        this,
        webpackConfigFunctionArgs,
      );

      if (isThenable(maybeUserNextConfigObject)) {
        return maybeUserNextConfigObject.then(function (userNextConfigObject) {
          const userSentryOptions = { ...userNextConfigObject.sentry, ...sentryOptions };
          return getFinalConfigObject(userNextConfigObject, userSentryOptions, userSentryWebpackPluginOptions);
        });
      }

      // Reassign for naming-consistency sake.
      const userNextConfigObject = maybeUserNextConfigObject;
      const userSentryOptions = { ...userNextConfigObject.sentry, ...sentryOptions };
      return getFinalConfigObject(userNextConfigObject, userSentryOptions, userSentryWebpackPluginOptions);
    };
  } else {
    const userSentryOptions = { ...exportedUserNextConfig.sentry, ...sentryOptions };
    return getFinalConfigObject(exportedUserNextConfig, userSentryOptions, userSentryWebpackPluginOptions);
  }
}

// Modify the materialized object form of the user's next config by deleting the `sentry` property and wrapping the
// `webpack` property
function getFinalConfigObject(
  incomingUserNextConfigObject,
  userSentryOptions,
  userSentryWebpackPluginOptions,
) {
  // Next 12.2.3+ warns about non-canonical properties on `userNextConfig`.
  delete incomingUserNextConfigObject.sentry;

  if (_optionalChain([userSentryOptions, 'optionalAccess', _ => _.tunnelRoute])) {
    if (incomingUserNextConfigObject.output === 'export') {
      if (!showedExportModeTunnelWarning) {
        showedExportModeTunnelWarning = true;
        // eslint-disable-next-line no-console
        console.warn(
          '[@sentry/nextjs] The Sentry Next.js SDK `tunnelRoute` option will not work in combination with Next.js static exports. The `tunnelRoute` option uses serverside features that cannot be accessed in export mode. If you still want to tunnel Sentry events, set up your own tunnel: https://docs.sentry.io/platforms/javascript/troubleshooting/#using-the-tunnel-option',
        );
      }
    } else {
      setUpTunnelRewriteRules(incomingUserNextConfigObject, userSentryOptions.tunnelRoute);
    }
  }

  return {
    ...incomingUserNextConfigObject,
    webpack: constructWebpackConfigFunction(
      incomingUserNextConfigObject,
      userSentryWebpackPluginOptions,
      userSentryOptions,
    ),
  };
}

/**
 * Injects rewrite rules into the Next.js config provided by the user to tunnel
 * requests from the `tunnelPath` to Sentry.
 *
 * See https://nextjs.org/docs/api-reference/next.config.js/rewrites.
 */
function setUpTunnelRewriteRules(userNextConfig, tunnelPath) {
  const originalRewrites = userNextConfig.rewrites;

  // This function doesn't take any arguments at the time of writing but we future-proof
  // here in case Next.js ever decides to pass some
  userNextConfig.rewrites = async (...args) => {
    const injectedRewrite = {
      // Matched rewrite routes will look like the following: `[tunnelPath]?o=[orgid]&p=[projectid]`
      // Nextjs will automatically convert `source` into a regex for us
      source: `${tunnelPath}(/?)`,
      has: [
        {
          type: 'query',
          key: 'o', // short for orgId - we keep it short so matching is harder for ad-blockers
          value: '(?<orgid>\\d*)',
        },
        {
          type: 'query',
          key: 'p', // short for projectId - we keep it short so matching is harder for ad-blockers
          value: '(?<projectid>\\d*)',
        },
      ],
      destination: 'https://o:orgid.ingest.sentry.io/api/:projectid/envelope/?hsts=0',
    };

    if (typeof originalRewrites !== 'function') {
      return [injectedRewrite];
    }

    // @ts-expect-error Expected 0 arguments but got 1 - this is from the future-proofing mentioned above, so we don't care about it
    const originalRewritesResult = await originalRewrites(...args);

    if (Array.isArray(originalRewritesResult)) {
      return [injectedRewrite, ...originalRewritesResult];
    } else {
      return {
        ...originalRewritesResult,
        beforeFiles: [injectedRewrite, ...(originalRewritesResult.beforeFiles || [])],
      };
    }
  };
}

export { withSentryConfig };
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