import { ExpoConfig } from '@expo/config-types';
import fs from 'fs';
import path from 'path';
import resolveFrom from 'resolve-from';

import { ConfigPlugin, InfoPlist } from '../Plugin.types';
import { createInfoPlistPlugin, withAppDelegate } from '../plugins/ios-plugins';
import { withDangerousMod } from '../plugins/withDangerousMod';
import { mergeContents, MergeResults, removeContents } from '../utils/generateCode';

const debug = require('debug')('expo:config-plugins:ios:maps') as typeof console.log;

export const MATCH_INIT =
  /-\s*\(BOOL\)\s*application:\s*\(UIApplication\s*\*\s*\)\s*\w+\s+didFinishLaunchingWithOptions:/g;

const withGoogleMapsKey = createInfoPlistPlugin(setGoogleMapsApiKey, 'withGoogleMapsKey');

export const withMaps: ConfigPlugin = (config) => {
  config = withGoogleMapsKey(config);

  const apiKey = getGoogleMapsApiKey(config);
  // Technically adds react-native-maps (Apple maps) and google maps.

  debug('Google Maps API Key:', apiKey);
  config = withMapsCocoaPods(config, { useGoogleMaps: !!apiKey });

  // Adds/Removes AppDelegate setup for Google Maps API on iOS
  config = withGoogleMapsAppDelegate(config, { apiKey });

  return config;
};

export function getGoogleMapsApiKey(config: Pick<ExpoConfig, 'ios'>) {
  return config.ios?.config?.googleMapsApiKey ?? null;
}

export function setGoogleMapsApiKey(
  config: Pick<ExpoConfig, 'ios'>,
  { GMSApiKey, ...infoPlist }: InfoPlist
): InfoPlist {
  const apiKey = getGoogleMapsApiKey(config);

  if (apiKey === null) {
    return infoPlist;
  }

  return {
    ...infoPlist,
    GMSApiKey: apiKey,
  };
}

export function addGoogleMapsAppDelegateImport(src: string): MergeResults {
  const newSrc = [];
  newSrc.push(
    '#if __has_include(<GoogleMaps/GoogleMaps.h>)',
    '#import <GoogleMaps/GoogleMaps.h>',
    '#endif'
  );

  return mergeContents({
    tag: 'react-native-maps-import',
    src,
    newSrc: newSrc.join('\n'),
    anchor: /#import "AppDelegate\.h"/,
    offset: 1,
    comment: '//',
  });
}

export function removeGoogleMapsAppDelegateImport(src: string): MergeResults {
  return removeContents({
    tag: 'react-native-maps-import',
    src,
  });
}

export function addGoogleMapsAppDelegateInit(src: string, apiKey: string): MergeResults {
  const newSrc = [];
  newSrc.push(
    '#if __has_include(<GoogleMaps/GoogleMaps.h>)',
    `  [GMSServices provideAPIKey:@"${apiKey}"];`,
    '#endif'
  );

  return mergeContents({
    tag: 'react-native-maps-init',
    src,
    newSrc: newSrc.join('\n'),
    anchor: MATCH_INIT,
    offset: 2,
    comment: '//',
  });
}

export function removeGoogleMapsAppDelegateInit(src: string): MergeResults {
  return removeContents({
    tag: 'react-native-maps-init',
    src,
  });
}

/**
 * @param src The contents of the Podfile.
 * @returns Podfile with Google Maps added.
 */
export function addMapsCocoaPods(src: string): MergeResults {
  return mergeContents({
    tag: 'react-native-maps',
    src,
    newSrc: `  pod 'react-native-google-maps', path: File.dirname(\`node --print "require.resolve('react-native-maps/package.json')"\`)`,
    anchor: /use_native_modules/,
    offset: 0,
    comment: '#',
  });
}

export function removeMapsCocoaPods(src: string): MergeResults {
  return removeContents({
    tag: 'react-native-maps',
    src,
  });
}

function isReactNativeMapsInstalled(projectRoot: string): string | null {
  const resolved = resolveFrom.silent(projectRoot, 'react-native-maps/package.json');
  return resolved ? path.dirname(resolved) : null;
}

function isReactNativeMapsAutolinked(config: Pick<ExpoConfig, '_internal'>): boolean {
  // Only add the native code changes if we know that the package is going to be linked natively.
  // This is specifically for monorepo support where one app might have react-native-maps (adding it to the node_modules)
  // but another app will not have it installed in the package.json, causing it to not be linked natively.
  // This workaround only exists because react-native-maps doesn't have a config plugin vendored in the package.

  // TODO: `react-native-maps` doesn't use Expo autolinking so we cannot safely disable the module.
  return true;

  // return (
  //   !config._internal?.autolinkedModules ||
  //   config._internal.autolinkedModules.includes('react-native-maps')
  // );
}

const withMapsCocoaPods: ConfigPlugin<{ useGoogleMaps: boolean }> = (config, { useGoogleMaps }) => {
  return withDangerousMod(config, [
    'ios',
    async (config) => {
      const filePath = path.join(config.modRequest.platformProjectRoot, 'Podfile');
      const contents = await fs.promises.readFile(filePath, 'utf-8');
      let results: MergeResults;
      // Only add the block if react-native-maps is installed in the project (best effort).
      // Generally prebuild runs after a yarn install so this should always work as expected.
      const googleMapsPath = isReactNativeMapsInstalled(config.modRequest.projectRoot);
      const isLinked = isReactNativeMapsAutolinked(config);
      debug('Is Expo Autolinked:', isLinked);
      debug('react-native-maps path:', googleMapsPath);
      if (isLinked && googleMapsPath && useGoogleMaps) {
        try {
          results = addMapsCocoaPods(contents);
        } catch (error: any) {
          if (error.code === 'ERR_NO_MATCH') {
            throw new Error(
              `Cannot add react-native-maps to the project's ios/Podfile because it's malformed. Please report this with a copy of your project Podfile.`
            );
          }
          throw error;
        }
      } else {
        // If the package is no longer installed, then remove the block.
        results = removeMapsCocoaPods(contents);
      }
      if (results.didMerge || results.didClear) {
        await fs.promises.writeFile(filePath, results.contents);
      }
      return config;
    },
  ]);
};

const withGoogleMapsAppDelegate: ConfigPlugin<{ apiKey: string | null }> = (config, { apiKey }) => {
  return withAppDelegate(config, (config) => {
    if (['objc', 'objcpp'].includes(config.modResults.language)) {
      if (
        apiKey &&
        isReactNativeMapsAutolinked(config) &&
        isReactNativeMapsInstalled(config.modRequest.projectRoot)
      ) {
        try {
          config.modResults.contents = addGoogleMapsAppDelegateImport(
            config.modResults.contents
          ).contents;
          config.modResults.contents = addGoogleMapsAppDelegateInit(
            config.modResults.contents,
            apiKey
          ).contents;
        } catch (error: any) {
          if (error.code === 'ERR_NO_MATCH') {
            throw new Error(
              `Cannot add Google Maps to the project's AppDelegate because it's malformed. Please report this with a copy of your project AppDelegate.`
            );
          }
          throw error;
        }
      } else {
        config.modResults.contents = removeGoogleMapsAppDelegateImport(
          config.modResults.contents
        ).contents;
        config.modResults.contents = removeGoogleMapsAppDelegateInit(
          config.modResults.contents
        ).contents;
      }
    } else {
      throw new Error(
        `Cannot setup Google Maps because the project AppDelegate is not a supported language: ${config.modResults.language}`
      );
    }
    return config;
  });
};