import fs from 'node:fs';

import { PNG } from 'pngjs';

const appConfigPath = new URL('../app.json', import.meta.url);
const appConfig = JSON.parse(fs.readFileSync(appConfigPath, 'utf8')).expo;
const appPath = new URL('../App.tsx', import.meta.url);
const appSource = fs.readFileSync(appPath, 'utf8');
const bridgePath = new URL('../src/mobileHostBridge.ts', import.meta.url);
const bridgeSource = fs.readFileSync(bridgePath, 'utf8');
const mobileShellUrlPath = new URL('../src/mobileShellUrl.ts', import.meta.url);
const mobileShellUrlSource = fs.readFileSync(mobileShellUrlPath, 'utf8');
const sharedContractPath = new URL(
  '../../../packages/shared/src/contracts/hostBridge.ts',
  import.meta.url,
);
const sharedContractSource = fs.readFileSync(sharedContractPath, 'utf8');
const packagePath = new URL('../package.json', import.meta.url);
const packageConfig = JSON.parse(fs.readFileSync(packagePath, 'utf8'));
const iconPath = new URL('../assets/icon.png', import.meta.url);
const icon = PNG.sync.read(fs.readFileSync(iconPath));
const brandBackgroundColor = '#fffdf9';
const productionSourceRoots = [
  new URL('../App.tsx', import.meta.url),
  new URL('../app.json', import.meta.url),
  new URL('../package.json', import.meta.url),
  new URL('../src/', import.meta.url),
];
const productionFileExtensions = new Set(['.json', '.mjs', '.ts', '.tsx']);
const devScaffoldTerms = [
  'mo' + 'ck',
  'fa' + 'ke',
  'place' + 'holder',
  'st' + 'ub',
  'TO' + 'DO',
  'FIX' + 'ME',
  '占' + '位',
  '模' + '拟',
  '伪' + '造',
];

function extractStringArrayExport(source, exportName) {
  const match = source.match(
    new RegExp(`export const ${exportName}[^=]*= \\[([\\s\\S]*?)\\](?: as const)?;`),
  );
  if (!match) {
    throw new Error(`unable to read ${exportName}`);
  }

  const entries = [...match[1].matchAll(/'([^']+)'/g)].map(
    (entry) => entry[1],
  );
  if (match[1].includes('...HOST_BRIDGE_METHODS')) {
    return [
      ...extractStringArrayExport(source, 'HOST_BRIDGE_METHODS'),
      ...entries,
    ];
  }

  return entries;
}

function collectProductionSourceFiles(entry) {
  const stats = fs.statSync(entry);
  if (stats.isDirectory()) {
    const directory = entry.href.endsWith('/') ? entry : new URL(`${entry.href}/`);
    return fs
      .readdirSync(entry, { withFileTypes: true })
      .flatMap((child) =>
        collectProductionSourceFiles(
          new URL(`${child.name}${child.isDirectory() ? '/' : ''}`, directory),
        ),
      );
  }

  const path = entry.pathname;
  const extension = path.match(/\.[^.]+$/)?.[0] ?? '';
  if (!productionFileExtensions.has(extension)) {
    return [];
  }
  if (path.includes('.test.') || path.endsWith('/scripts/check-config.mjs')) {
    return [];
  }

  return [entry];
}

function assertNoDevScaffoldTerms(files) {
  for (const file of files) {
    const source = fs.readFileSync(file, 'utf8');
    const lineStarts = [0];
    for (let index = 0; index < source.length; index += 1) {
      if (source[index] === '\n') {
        lineStarts.push(index + 1);
      }
    }

    for (const term of devScaffoldTerms) {
      const matchIndex = source.toLowerCase().indexOf(term.toLowerCase());
      if (matchIndex === -1) {
        continue;
      }
      const line = lineStarts.filter((start) => start <= matchIndex).length;
      throw new Error(
        `mobile shell production source must not include ${term}: ${file.pathname}:${line}`,
      );
    }
  }
}

function countAlphaPixels(png) {
  let transparent = 0;
  let translucent = 0;
  let opaque = 0;
  for (let index = 3; index < png.data.length; index += 4) {
    const alpha = png.data[index];
    if (alpha === 0) {
      transparent += 1;
    } else if (alpha === 255) {
      opaque += 1;
    } else {
      translucent += 1;
    }
  }

  return { transparent, translucent, opaque };
}

assertNoDevScaffoldTerms(
  productionSourceRoots.flatMap((root) => collectProductionSourceFiles(root)),
);

const sharedCapabilities = extractStringArrayExport(
  sharedContractSource,
  'HOST_BRIDGE_CAPABILITIES',
);
const mobileCapabilities = extractStringArrayExport(
  bridgeSource,
  'MOBILE_HOST_CAPABILITIES',
);
const iosMobileCapabilities = extractStringArrayExport(
  bridgeSource,
  'IOS_MOBILE_HOST_CAPABILITIES',
);
const mobileCapabilitySet = new Set(mobileCapabilities);
const iosMobileCapabilitySet = new Set(iosMobileCapabilities);
const unknownMobileCapabilities = mobileCapabilities.filter(
  (capability) => !sharedCapabilities.includes(capability),
);
if (unknownMobileCapabilities.length > 0) {
  throw new Error(
    `mobile shell declares unknown HostBridge capabilities: ${unknownMobileCapabilities.join(', ')}`,
  );
}

const unknownIosMobileCapabilities = iosMobileCapabilities.filter(
  (capability) => !sharedCapabilities.includes(capability),
);
if (unknownIosMobileCapabilities.length > 0) {
  throw new Error(
    `iOS mobile shell declares unknown HostBridge capabilities: ${unknownIosMobileCapabilities.join(', ')}`,
  );
}

for (const capability of iosMobileCapabilities) {
  const switchCase = `case '${capability}':`;
  if (
    capability !== 'host.events' &&
    capability !== 'app.lifecycle' &&
    capability !== 'navigation.canGoBack' &&
    !bridgeSource.includes(switchCase)
  ) {
    throw new Error(
      `mobile shell declares ${capability} but does not handle it in HostBridge`,
    );
  }
}

if (appConfig.scheme !== 'genarrative') {
  throw new Error('mobile shell scheme must be genarrative');
}

if (appConfig.version !== '0.1.0') {
  throw new Error('mobile shell app version must be 0.1.0');
}

if (packageConfig.version !== appConfig.version) {
  throw new Error('mobile shell package version must match app.json version');
}

if (appConfig.icon !== './assets/icon.png') {
  throw new Error('mobile shell must use the real brand icon asset');
}

if (icon.width < 512 || icon.height < 512) {
  throw new Error('mobile shell icon must be a production-size brand asset');
}

const iconAlpha = countAlphaPixels(icon);
if (iconAlpha.transparent === 0 || iconAlpha.opaque === 0) {
  throw new Error('mobile shell adaptive icon foreground must use the real transparent brand asset');
}

if (
  appConfig.splash?.image !== './assets/icon.png' ||
  appConfig.splash?.resizeMode !== 'contain' ||
  appConfig.splash?.backgroundColor !== brandBackgroundColor
) {
  throw new Error('mobile shell splash must use the real brand icon and brand background');
}

if (!appConfig.ios?.associatedDomains?.includes('applinks:app.genarrative.world')) {
  throw new Error('mobile shell iOS associated domain is missing');
}

if (appConfig.ios?.bundleIdentifier !== 'world.genarrative.mobile') {
  throw new Error('mobile shell iOS bundle identifier must be world.genarrative.mobile');
}

if (appConfig.ios?.buildNumber !== '1') {
  throw new Error('mobile shell iOS build number must start at 1');
}

if (appConfig.ios?.infoPlist?.ITSAppUsesNonExemptEncryption !== false) {
  throw new Error('mobile shell iOS encryption export flag must be explicit');
}

if (
  appConfig.ios?.infoPlist?.NSAppTransportSecurity?.NSAllowsArbitraryLoads !== false
) {
  throw new Error('mobile shell iOS ATS must not allow arbitrary network loads');
}

if (appConfig.android?.package !== 'world.genarrative.mobile') {
  throw new Error('mobile shell Android package must be world.genarrative.mobile');
}

if (appConfig.android?.versionCode !== 1) {
  throw new Error('mobile shell Android versionCode must start at 1');
}

if (appConfig.android?.usesCleartextTraffic !== false) {
  throw new Error('mobile shell Android package must disable cleartext traffic');
}

if (appConfig.android?.allowBackup !== false) {
  throw new Error('mobile shell Android package must disable app data backup');
}

if (
  !appConfig.android?.blockedPermissions?.includes(
    'android.permission.RECORD_AUDIO',
  )
) {
  throw new Error('mobile shell Android package must block microphone permission');
}

if (
  appConfig.android?.permissions?.includes('android.permission.RECORD_AUDIO')
) {
  throw new Error('mobile shell Android package must not request microphone');
}

if (
  appConfig.android?.adaptiveIcon?.foregroundImage !== './assets/icon.png' ||
  appConfig.android?.adaptiveIcon?.backgroundColor !== brandBackgroundColor
) {
  throw new Error('mobile shell Android adaptive icon must use the real brand icon and brand background');
}

const androidFilter = appConfig.android?.intentFilters?.find((filter) =>
  filter?.data?.some(
    (entry) =>
      entry?.scheme === 'https' &&
      entry?.host === 'app.genarrative.world',
  ),
);
if (!androidFilter) {
  throw new Error('mobile shell Android app link filter is missing');
}

for (const snippet of [
  'Linking.getInitialURL()',
  "Linking.addEventListener('url'",
  'buildMobileShellUrlFromDeepLink',
  'configureMobileHostBridgeNavigation',
  'webViewRef.current?.reload()',
  'AppState.addEventListener',
  'app.lifecycle',
  'network.statusChanged',
  'subscribeMobileNetworkStatus',
  'navigation.canGoBack',
  'buildHostBridgeMessageScript',
  'SafeAreaProvider',
  'SafeAreaView',
  'MOBILE_SHELL_SAFE_AREA_EDGES',
  'resolveMobileShellBaseWebUrl',
  'javaScriptCanOpenWindowsAutomatically={false}',
  'mixedContentMode="never"',
  'allowFileAccess={false}',
  'allowFileAccessFromFileURLs={false}',
  'allowUniversalAccessFromFileURLs={false}',
  'thirdPartyCookiesEnabled={false}',
  'sharedCookiesEnabled={false}',
  'webviewDebuggingEnabled={false}',
  'setSupportMultipleWindows={false}',
]) {
  if (!appSource.includes(snippet)) {
    throw new Error(`mobile shell App missing ${snippet}`);
  }
}

if (appSource.includes('process.env.EXPO_PUBLIC_GENARRATIVE_WEB_URL ||')) {
  throw new Error('mobile shell App must normalize EXPO_PUBLIC_GENARRATIVE_WEB_URL');
}

if (
  !mobileShellUrlSource.includes(
    "DEFAULT_MOBILE_SHELL_WEB_URL = 'https://app.genarrative.world/'",
  )
) {
  throw new Error('mobile shell default H5 URL must point to the production web app');
}

if (appSource.includes('127.0.0.1:3000')) {
  throw new Error('mobile shell App must not hard-code localhost as the default H5 URL');
}

for (const dependency of [
  'expo-file-system',
  'expo-document-picker',
  'expo-image-picker',
  'expo-network',
  'expo-notifications',
  'expo-sharing',
  'react-native-safe-area-context',
]) {
  if (!packageConfig.dependencies?.[dependency]) {
    throw new Error(`mobile shell package missing ${dependency}`);
  }
}

const imagePickerPlugin = appConfig.plugins?.find((plugin) =>
  Array.isArray(plugin) ? plugin[0] === 'expo-image-picker' : plugin === 'expo-image-picker',
);
if (!imagePickerPlugin) {
  throw new Error('mobile shell image picker plugin is missing');
}

if (Array.isArray(imagePickerPlugin)) {
  const pluginOptions = imagePickerPlugin[1] ?? {};
  if (typeof pluginOptions.photosPermission !== 'string') {
    throw new Error('mobile shell image picker photo permission text is missing');
  }
  if (typeof pluginOptions.cameraPermission !== 'string') {
    throw new Error('mobile shell image picker camera permission text is missing');
  }
  if (pluginOptions.microphonePermission !== false) {
    throw new Error('mobile shell image picker must not request microphone');
  }
}

const notificationsPlugin = appConfig.plugins?.find((plugin) =>
  Array.isArray(plugin) ? plugin[0] === 'expo-notifications' : plugin === 'expo-notifications',
);
if (!notificationsPlugin) {
  throw new Error('mobile shell notifications plugin is missing');
}

if (Array.isArray(notificationsPlugin)) {
  const pluginOptions = notificationsPlugin[1] ?? {};
  if (pluginOptions.enableBackgroundRemoteNotifications !== false) {
    throw new Error('mobile shell must not enable background remote notifications');
  }
}

for (const snippet of [
  'file.exportText',
  'file.importText',
  'file.exportImage',
  'file.importImage',
  'file.captureImage',
  'file.importAudio',
  'file.exportAudio',
  'clipboard.readText',
  'notification.showLocal',
  'network.status',
  'app.reloadWebView',
  'getMobileNetworkStatus',
  'Notifications.scheduleNotificationAsync',
  'Notifications.setNotificationChannelAsync',
  'Notifications.getPermissionsAsync',
  'Notifications.requestPermissionsAsync',
  'Sharing.shareAsync',
  'DocumentPicker.getDocumentAsync',
  'Clipboard.getStringAsync',
  'ImagePicker.launchImageLibraryAsync',
  'ImagePicker.launchCameraAsync',
  'ImagePicker.requestMediaLibraryPermissionsAsync',
  'ImagePicker.requestCameraPermissionsAsync',
  'File(asset.uri)',
  'file.base64()',
  'normalizeHostBridgeExportFileName',
  'normalizeHostBridgeClipboardText',
  'base64Data',
]) {
  if (!bridgeSource.includes(snippet)) {
    throw new Error(`mobile shell HostBridge missing ${snippet}`);
  }
}

const capabilityQuerySnippet = "capabilities: MOBILE_HOST_CAPABILITIES";
if (appSource.includes(capabilityQuerySnippet)) {
  throw new Error('mobile shell URL must resolve platform-aware capabilities');
}

if (!appSource.includes('capabilities: resolveMobileHostCapabilities()')) {
  throw new Error('mobile shell URL must use resolveMobileHostCapabilities()');
}

for (const capability of [
  'host.getRuntime',
  'appearance.getColorScheme',
  'share.open',
  'share.setTarget',
  'app.lifecycle',
  'network.status',
  'network.statusChanged',
  'navigation.openNativePage',
  'navigation.canGoBack',
  'app.reloadWebView',
  'app.openExternalUrl',
  'clipboard.writeText',
  'clipboard.readText',
  'file.exportText',
  'file.importText',
  'file.exportImage',
  'file.importImage',
  'file.captureImage',
  'file.importAudio',
  'file.exportAudio',
  'haptics.impact',
  'notification.showLocal',
]) {
  if (!mobileCapabilitySet.has(capability)) {
    throw new Error(`mobile shell capabilities missing ${capability}`);
  }
}

if (!iosMobileCapabilitySet.has('app.setBadgeCount')) {
  throw new Error('iOS mobile shell capabilities missing app.setBadgeCount');
}

if (mobileCapabilitySet.has('app.setBadgeCount')) {
  throw new Error('Android mobile shell base capabilities must not include app.setBadgeCount');
}

if (!bridgeSource.includes('Appearance.getColorScheme()')) {
  throw new Error('mobile shell HostBridge must read the native color scheme');
}