const { execSync } = require('node:child_process');
const { join } = require('node:path');
const { readdir, readFile, writeFile, rm } = require('node:fs/promises');
const { existsSync } = require('node:fs');
const { download } = require('molnia');

const downloadMobileApk = async () => {
  const url = 'https://api.qqaoop.com/v11/apps/com.crunchyroll.crunchyroid/download?userId=1';
  const filepath = join(process.cwd(), 'crunchyroll.apk');
  await download(url, {
    output: filepath,
    onError: (error) => console.error(error),
  });
  return filepath;
};

const downloadTvApk = async () => {
  const source = 'https://webservices.aptoide.com/webservices/3/getApkInfo';
  const formData = new FormData();
  formData.append('identif', 'id:71666229');
  formData.append('mode', 'json');
  const response = await fetch(source, {
    method: 'POST',
    body: formData,
  });
  const json = await response.json();
  const url = json.apk.path;
  const filepath = join(process.cwd(), 'crunchyroll.apk');
  await download(url, {
    output: filepath,
    onError: (error) => console.error(error),
  });
  return filepath;
};

const decompileApk = (apkPath) => {
  try {
    execSync(`jadx ${apkPath}`, { stdio: 'inherit' });
  } catch (error) {}
  return apkPath.replace('.xapk', '').replace('.apk', '');
};

const findConfigurationImpl = async (sourcesDir) => {
  const entries = await readdir(sourcesDir, { withFileTypes: true });
  for (const entry of entries) {
    if (!entry.isDirectory()) continue;
    const moduleDir = join(sourcesDir, entry.name);
    const moduleEntries = await readdir(moduleDir, { withFileTypes: true });
    for (const moduleFile of moduleEntries) {
      if (moduleFile.isDirectory()) continue;
      const moduleFilePath = join(moduleDir, moduleFile.name);
      const moduleContents = await readFile(moduleFilePath, 'utf8');
      if (moduleContents.includes(' ConfigurationImpl.kt')) {
        return moduleContents;
      }
    }
  }
};

const parseCredentials = async (decompiledDir) => {
  const sourcesDir = join(decompiledDir, 'sources');
  const configurationImpl = await findConfigurationImpl(sourcesDir);
  if (configurationImpl) {
    const lines = configurationImpl.split('\n');
    const startIndex = lines.findIndex((line) => line.includes('https://sso.crunchyroll.com'));
    const endIndex = lines.findIndex((line) => line.includes('CR-AndroidMobile-SSAI-Prod'));
    const results = lines
      .slice(startIndex, endIndex)
      .map((line) => line.replaceAll(';', ''))
      .map((line) => line.replaceAll('"', ''))
      .map((line) => line.split('= ')[1])
      .map((line) => line.trim());
    const [, , id, secret] = results;
    if (id && secret) return { id, secret };
  }

  const constantsPath = join(decompiledDir, 'sources', 'com', 'crunchyroll', 'api', 'util', 'Constants.java');
  const constants = await readFile(constantsPath, 'utf8');
  return {
    id: constants.split(' PROD_CLIENT_ID = "')[1].split('"')[0],
    secret: constants.split(' PROD_CLIENT_SECRET = "')[1].split('"')[0],
  };
};

const parseVersion = async (decompiledDir) => {
  const manifestJsonPath = join(decompiledDir, 'resources', 'manifest.json');
  const manifestXmlPath = join(decompiledDir, 'resources', 'AndroidManifest.xml');
  if (existsSync(manifestJsonPath)) {
    const manifest = require(manifestJsonPath);
    const version = `${manifest.version_name} (${manifest.version_code})`;
    return version;
  } else if (existsSync(manifestXmlPath)) {
    const manifest = await readFile(manifestXmlPath, 'utf8');
    const version = `${manifest.match(/versionName="([^"]+)"/)[1]} (${manifest.match(/versionCode="([^"]+)"/)[1]})`;
    return version;
  }
};

const extract = async ({ target = 'mobile', output, cleanup = false } = {}) => {
  console.log('Downloading APK...');
  const apkPath = target === 'tv' ? await downloadTvApk() : await downloadMobileApk();

  console.log('Decompiling APK...');
  const decompiledDir = decompileApk(apkPath);

  console.log('Parsing version...');
  const version = await parseVersion(decompiledDir);

  console.log('Parsing credentials...');
  const { id, secret } = await parseCredentials(decompiledDir);
  const encoded = Buffer.from(`${id}:${secret}`).toString('base64');
  const authorization = `Basic ${encoded}`;

  console.log(`Cleaning up files...`);
  if (cleanup) await rm(apkPath, { recursive: true, force: true });
  if (cleanup) await rm(decompiledDir, { recursive: true, force: true });

  console.log(`Version: ${version}`);
  console.log(`ID: ${id}`);
  console.log(`Secret: ${secret}`);
  console.log(`Encoded ID with secret: ${encoded}`);
  console.log(`Authorization: ${authorization}`);

  if (output) {
    await writeFile(output, JSON.stringify({ version, id, secret, encoded, authorization }, null, 2));
  }

  return { version, id, secret, encoded, authorization };
};

const pull = async ({ target = 'mobile' } = {}) => {
  const url = `https://raw.githubusercontent.com/vitalygashkov/crextractor/refs/heads/main/credentials.${target}.json`;
  const credentials = await fetch(url).then((response) => response.json());
  return credentials;
};

module.exports = { extract, pull };