import { AndroidConfig, IOSConfig, ModPlatform } from '@expo/config-plugins';
import chalk from 'chalk';
import fs from 'fs';
import path from 'path';

import * as Log from '../log';
import { directoryExistsAsync } from '../utils/dir';
import { isInteractive } from '../utils/interactive';
import { logNewSection } from '../utils/ora';
import { confirmAsync } from '../utils/prompts';

type ArbitraryPlatform = ModPlatform | string;

/** Delete the input native folders and print a loading step. */
export async function clearNativeFolder(projectRoot: string, folders: string[]) {
  const step = logNewSection(`Clearing ${folders.join(', ')}`);
  try {
    await Promise.all(
      folders.map((folderName) =>
        fs.promises.rm(path.join(projectRoot, folderName), {
          recursive: true,
          force: true,
        })
      )
    );
    step.succeed(`Cleared ${folders.join(', ')} code`);
  } catch (error: any) {
    step.fail(`Failed to delete ${folders.join(', ')} code: ${error.message}`);
    throw error;
  }
}

/**
 * Returns `true` if a certain subset of required Android project files are intact.
 *
 * This isn't perfect but it serves the purpose of indicating that the user should
 * be warned to nuke the project files, most commonly when git is cleared and the root folder
 * remains in memory.
 */
export async function hasRequiredAndroidFilesAsync(projectRoot: string): Promise<boolean> {
  try {
    await Promise.all([
      AndroidConfig.Paths.getAppBuildGradleAsync(projectRoot),
      AndroidConfig.Paths.getProjectBuildGradleAsync(projectRoot),
      AndroidConfig.Paths.getAndroidManifestAsync(projectRoot),
      AndroidConfig.Paths.getMainApplicationAsync(projectRoot),
    ]);
    return true;
  } catch {
    return false;
  }
}

/** Returns `true` if a certain subset of required iOS project files are intact. */
export async function hasRequiredIOSFilesAsync(projectRoot: string) {
  try {
    // If any of the following required files are missing, then the project is malformed.
    await Promise.all([
      IOSConfig.Paths.getAllXcodeProjectPaths(projectRoot),
      IOSConfig.Paths.getAllPBXProjectPaths(projectRoot),
    ]);
    return true;
  } catch {
    return false;
  }
}

/**
 * Filter out platforms that do not have an existing platform folder.
 * If the user wants to validate that neither of ['ios', 'android'] are malformed then we should
 * first check that both `ios` and `android` folders exist.
 *
 * This optimization prevents us from prompting to clear a "malformed" project that doesn't exist yet.
 */
async function filterPlatformsThatDoNotExistAsync(
  projectRoot: string,
  platforms: ArbitraryPlatform[]
): Promise<ArbitraryPlatform[]> {
  const valid = await Promise.all(
    platforms.map(async (platform) => {
      if (await directoryExistsAsync(path.join(projectRoot, platform))) {
        return platform;
      }
      return null;
    })
  );
  return valid.filter(Boolean) as ArbitraryPlatform[];
}

/** Get a list of native platforms that have existing directories which contain malformed projects. */
export async function getMalformedNativeProjectsAsync(
  projectRoot: string,
  platforms: ArbitraryPlatform[]
): Promise<ArbitraryPlatform[]> {
  const VERIFIERS: Record<ArbitraryPlatform, (root: string) => Promise<boolean>> = {
    android: hasRequiredAndroidFilesAsync,
    ios: hasRequiredIOSFilesAsync,
  };

  const checkablePlatforms = platforms.filter((platform) => platform in VERIFIERS);
  const checkPlatforms = await filterPlatformsThatDoNotExistAsync(projectRoot, checkablePlatforms);
  return (
    await Promise.all(
      checkPlatforms.map(async (platform) => {
        if (!VERIFIERS[platform]) {
          return false;
        }
        if (await VERIFIERS[platform](projectRoot)) {
          return false;
        }
        return platform;
      })
    )
  ).filter(Boolean) as ArbitraryPlatform[];
}

export async function promptToClearMalformedNativeProjectsAsync(
  projectRoot: string,
  checkPlatforms: ArbitraryPlatform[]
) {
  const platforms = await getMalformedNativeProjectsAsync(projectRoot, checkPlatforms);

  if (!platforms.length) {
    return;
  }

  const displayPlatforms = platforms.map((platform) => chalk.cyan(platform));
  // Prompt which platforms to reset.
  const message =
    platforms.length > 1
      ? `The ${displayPlatforms[0]} and ${displayPlatforms[1]} projects are malformed`
      : `The ${displayPlatforms[0]} project is malformed`;

  if (
    // If the process is non-interactive, default to clearing the malformed native project.
    // This would only happen on re-running eject.
    !isInteractive() ||
    // Prompt to clear the native folders.
    (await confirmAsync({
      message: `${message}, would you like to clear the project files and reinitialize them?`,
      initial: true,
    }))
  ) {
    if (!isInteractive()) {
      Log.warn(`${message}, project files will be cleared and reinitialized.`);
    }
    await clearNativeFolder(projectRoot, platforms);
  } else {
    // Warn the user that the process may fail.
    Log.warn('Continuing with malformed native projects');
  }
}