export const HOST_BRIDGE_PROTOCOL = 'GenarrativeHostBridge';
export const HOST_BRIDGE_VERSION = 1;
export const HOST_BRIDGE_TAURI_COMMAND = 'host_bridge_request';
export const HOST_BRIDGE_PUBLIC_WEB_ORIGIN = 'https://www.genarrative.world';
export const HOST_BRIDGE_PUBLIC_WEB_URL = 'https://www.genarrative.world/';

export type HostShellKind = 'browser' | 'wechat_mini_program' | 'native_app';

export type NativeHostShell = 'expo_mobile' | 'tauri_desktop';

export type NativeHostPlatform =
  | 'ios'
  | 'android'
  | 'macos'
  | 'windows'
  | 'linux'
  | 'unknown';

export const HOST_BRIDGE_RUNTIME_CONTEXT_QUERY_KEY = {
  clientRuntime: 'clientRuntime',
  clientType: 'clientType',
  miniProgramEnv: 'miniProgramEnv',
  hostShell: 'hostShell',
  hostPlatform: 'hostPlatform',
  hostVersion: 'hostVersion',
  bridgeVersion: 'bridgeVersion',
  hostCapabilities: 'hostCapabilities',
} as const;

export const HOST_BRIDGE_PRESERVED_RUNTIME_CONTEXT_QUERY_KEYS = [
  'clientType',
  'clientRuntime',
  'miniProgramEnv',
  'hostShell',
  'hostPlatform',
  'hostVersion',
  'bridgeVersion',
  'hostCapabilities',
] as const;

export const HOST_BRIDGE_NATIVE_APP_QUERY_KEY = {
  clientRuntime: 'clientRuntime',
  clientType: 'clientType',
  hostShell: 'hostShell',
  hostPlatform: 'hostPlatform',
  hostVersion: 'hostVersion',
  bridgeVersion: 'bridgeVersion',
  hostCapabilities: 'hostCapabilities',
} as const;

export const HOST_BRIDGE_NATIVE_APP_QUERY_KEYS = [
  'clientRuntime',
  'clientType',
  'hostShell',
  'hostPlatform',
  'hostVersion',
  'bridgeVersion',
  'hostCapabilities',
] as const;

export const HOST_BRIDGE_NATIVE_APP_QUERY = {
  clientRuntime: 'native_app',
  clientType: 'native_app',
  hostShellExpoMobile: 'expo_mobile',
  hostShellTauriDesktop: 'tauri_desktop',
} as const;

export const HOST_BRIDGE_WECHAT_MINI_PROGRAM_SOURCE_QUERY = {
  clientType: 'mini_program',
  clientRuntime: 'wechat_mini_program',
} as const;

export const HOST_BRIDGE_METHODS = [
  'host.getRuntime',
  'appearance.getColorScheme',
  'auth.requestLogin',
  'payment.request',
  'share.setTarget',
  'share.open',
  'navigation.openNativePage',
  'app.reloadWebView',
  'app.openExternalUrl',
  'app.setTitle',
  'app.setBadgeCount',
  'network.status',
  'clipboard.writeText',
  'clipboard.readText',
  'file.exportText',
  'file.importText',
  'file.importDocument',
  'file.exportImage',
  'file.importImage',
  'file.captureImage',
  'scanner.scanQrCode',
  'file.importAudio',
  'file.exportAudio',
  'haptics.impact',
  'notification.showLocal',
] as const;

export type HostBridgeMethod = (typeof HOST_BRIDGE_METHODS)[number];

export function isHostBridgeMethod(value: unknown): value is HostBridgeMethod {
  return (
    typeof value === 'string' &&
    HOST_BRIDGE_METHODS.includes(value as HostBridgeMethod)
  );
}

export const HOST_BRIDGE_CAPABILITIES = [
  ...HOST_BRIDGE_METHODS,
  'host.events',
  'app.lifecycle',
  'network.statusChanged',
  'file.imageDropped',
  'navigation.canGoBack',
] as const;

export type HostBridgeCapability = (typeof HOST_BRIDGE_CAPABILITIES)[number];

export function isHostBridgeCapability(
  value: unknown,
): value is HostBridgeCapability {
  return (
    typeof value === 'string' &&
    HOST_BRIDGE_CAPABILITIES.includes(value as HostBridgeCapability)
  );
}

export const HOST_BRIDGE_WECHAT_MINI_PROGRAM_CAPABILITIES: readonly HostBridgeCapability[] =
  ['auth.requestLogin', 'payment.request', 'share.setTarget', 'share.open'];

export const HOST_BRIDGE_EXPO_MOBILE_BASE_CAPABILITIES: readonly HostBridgeCapability[] =
  [
    'host.getRuntime',
    'appearance.getColorScheme',
    'host.events',
    'app.lifecycle',
    'share.open',
    'share.setTarget',
    'navigation.openNativePage',
    'navigation.canGoBack',
    'app.reloadWebView',
    'app.openExternalUrl',
    'network.status',
    'network.statusChanged',
    'clipboard.writeText',
    'clipboard.readText',
    'file.exportText',
    'file.importText',
    'file.importDocument',
    'file.exportImage',
    'file.importImage',
    'file.captureImage',
    'scanner.scanQrCode',
    'file.importAudio',
    'file.exportAudio',
    'haptics.impact',
    'notification.showLocal',
  ];

export const HOST_BRIDGE_EXPO_MOBILE_IOS_EXTRA_CAPABILITIES: readonly HostBridgeCapability[] =
  ['app.setBadgeCount'];

export const HOST_BRIDGE_EXPO_MOBILE_IOS_CAPABILITIES: readonly HostBridgeCapability[] =
  [
    ...HOST_BRIDGE_EXPO_MOBILE_BASE_CAPABILITIES,
    ...HOST_BRIDGE_EXPO_MOBILE_IOS_EXTRA_CAPABILITIES,
  ];

export const HOST_BRIDGE_TAURI_DESKTOP_CAPABILITIES: readonly HostBridgeCapability[] =
  [
    'host.getRuntime',
    'appearance.getColorScheme',
    'host.events',
    'app.lifecycle',
    'share.open',
    'share.setTarget',
    'navigation.openNativePage',
    'navigation.canGoBack',
    'app.reloadWebView',
    'app.openExternalUrl',
    'app.setTitle',
    'app.setBadgeCount',
    'network.status',
    'clipboard.writeText',
    'clipboard.readText',
    'file.exportText',
    'file.importText',
    'file.importDocument',
    'file.exportImage',
    'file.importImage',
    'file.importAudio',
    'file.exportAudio',
    'file.imageDropped',
    'notification.showLocal',
  ];

export type HostBridgeRuntimeResult = {
  shell: NativeHostShell;
  platform: NativeHostPlatform;
  hostVersion: string | null;
  bridgeVersion: number;
  capabilities: readonly HostBridgeCapability[];
};

export type HostBridgeRequest<Payload = unknown> = {
  bridge: typeof HOST_BRIDGE_PROTOCOL;
  version: typeof HOST_BRIDGE_VERSION;
  id: string;
  method: HostBridgeMethod;
  payload?: Payload;
  timeoutMs?: number;
};

export const HOST_BRIDGE_DEFAULT_REQUEST_TIMEOUT_MS = 8000;
export const HOST_BRIDGE_MAX_REQUEST_TIMEOUT_MS = 60000;
export const HOST_BRIDGE_RUNTIME_REFRESH_TIMEOUT_MS = 3000;
export const HOST_BRIDGE_USER_INTERACTION_TIMEOUT_MS = 30000;
export const HOST_BRIDGE_SCANNER_TIMEOUT_MS = 60000;
export const HOST_BRIDGE_DESKTOP_NETWORK_CHECK_TIMEOUT_MS = 1200;
export const HOST_BRIDGE_RESPONSE_CACHE_MAX = 128;
export const HOST_BRIDGE_REQUEST_ID_MAX_LENGTH = 120;

export function normalizeHostBridgeRequestId(rawId: unknown) {
  if (typeof rawId !== 'string') {
    return null;
  }

  const id = rawId.trim();
  if (
    !id ||
    id.length > HOST_BRIDGE_REQUEST_ID_MAX_LENGTH ||
    hasHostBridgeControlCharacter(id)
  ) {
    return null;
  }

  return id;
}

export type HostBridgeError = {
  code:
    | 'invalid_request'
    | 'unsupported_method'
    | 'unsupported_capability'
    | 'timeout'
    | 'cancelled'
    | 'host_error';
  message: string;
};

export type HostBridgeResponse<Result = unknown> = {
  bridge: typeof HOST_BRIDGE_PROTOCOL;
  version: typeof HOST_BRIDGE_VERSION;
  id: string;
} & (
  | {
      ok: true;
      result?: Result;
    }
  | {
      ok: false;
      error: HostBridgeError;
    }
);

export const HOST_BRIDGE_EVENTS = [
  'app.lifecycle',
  'network.statusChanged',
  'navigation.canGoBack',
  'file.imageDropped',
] as const;

export type HostBridgeEventName = (typeof HOST_BRIDGE_EVENTS)[number];

export function isHostBridgeEventName(
  value: unknown,
): value is HostBridgeEventName {
  return (
    typeof value === 'string' &&
    HOST_BRIDGE_EVENTS.includes(value as HostBridgeEventName)
  );
}

export type HostBridgeEvent<Payload = unknown> = {
  bridge: typeof HOST_BRIDGE_PROTOCOL;
  version: typeof HOST_BRIDGE_VERSION;
  event: HostBridgeEventName;
  payload?: Payload;
};

export type NavigationCanGoBackEventPayload = {
  canGoBack: boolean;
};

export type HostAppLifecycleState = 'active' | 'inactive' | 'background';

export type AppLifecycleEventPayload = {
  state: HostAppLifecycleState;
  focused: boolean;
  nativeState?: string;
};

export function normalizeHostBridgeLifecycleState(
  rawState: unknown,
): HostAppLifecycleState {
  return rawState === 'active' || rawState === 'background'
    ? rawState
    : 'inactive';
}

export type HostNetworkConnectionType =
  | 'none'
  | 'unknown'
  | 'cellular'
  | 'wifi'
  | 'ethernet'
  | 'bluetooth'
  | 'vpn'
  | 'other';

export type NetworkStatusResult = {
  isConnected: boolean;
  isInternetReachable: boolean | null;
  connectionType: HostNetworkConnectionType;
  nativeType?: string;
};

export function normalizeHostBridgeConnectionType(
  rawConnectionType: unknown,
): HostNetworkConnectionType {
  if (typeof rawConnectionType !== 'string') {
    return 'unknown';
  }

  const normalizedType = rawConnectionType.toLowerCase();
  if (
    normalizedType === 'none' ||
    normalizedType === 'cellular' ||
    normalizedType === 'wifi' ||
    normalizedType === 'ethernet' ||
    normalizedType === 'bluetooth' ||
    normalizedType === 'vpn'
  ) {
    return normalizedType;
  }

  if (normalizedType === 'other') {
    return 'other';
  }

  return 'unknown';
}

export type HostAppearanceColorScheme = 'light' | 'dark' | 'unknown';

export type AppearanceColorSchemeResult = {
  colorScheme: HostAppearanceColorScheme;
};

export function normalizeHostBridgeColorScheme(
  rawColorScheme: unknown,
): HostAppearanceColorScheme {
  return rawColorScheme === 'light' || rawColorScheme === 'dark'
    ? rawColorScheme
    : 'unknown';
}

export type NavigateNativePagePayload = {
  url: string;
};

export type OpenExternalUrlPayload = {
  url: string;
};

export type SetTitlePayload = {
  title: string;
};

export const HOST_BRIDGE_APP_TITLE_MAX_LENGTH = 80;

export function normalizeHostBridgeAppTitle(
  rawTitle: unknown,
): SetTitlePayload | null {
  if (typeof rawTitle !== 'string') {
    return null;
  }

  const title = rawTitle.trim();
  if (!title || hasHostBridgeControlCharacter(title)) {
    return null;
  }

  return {
    title: title.slice(0, HOST_BRIDGE_APP_TITLE_MAX_LENGTH),
  };
}

export type SetBadgeCountPayload = {
  count: number;
};

export const HOST_BRIDGE_BADGE_COUNT_MAX = 99999;

export function normalizeHostBridgeBadgeCount(rawCount: unknown) {
  if (
    typeof rawCount !== 'number' ||
    !Number.isInteger(rawCount) ||
    rawCount < 0 ||
    rawCount > HOST_BRIDGE_BADGE_COUNT_MAX
  ) {
    return null;
  }

  return rawCount;
}

export const HOST_BRIDGE_EXTERNAL_URL_PROTOCOLS = [
  'http:',
  'https:',
  'mailto:',
  'tel:',
] as const;

export type HostBridgeExternalUrlProtocol =
  (typeof HOST_BRIDGE_EXTERNAL_URL_PROTOCOLS)[number];

export const HOST_BRIDGE_MOBILE_WEBVIEW_BLOCKED_DOWNLOAD_PROTOCOLS = [
  'blob:',
  'data:',
  'file:',
  'filesystem:',
] as const;

export type HostBridgeMobileWebViewBlockedDownloadProtocol =
  (typeof HOST_BRIDGE_MOBILE_WEBVIEW_BLOCKED_DOWNLOAD_PROTOCOLS)[number];

function hasHostBridgeControlCharacter(value: string) {
  return [...value].some((character) => {
    const codePoint = character.codePointAt(0) ?? 0;
    return codePoint <= 31 || codePoint === 127;
  });
}

export function normalizeHostBridgeExternalUrl(rawUrl: unknown) {
  if (typeof rawUrl !== 'string') {
    return null;
  }

  const urlText = rawUrl.trim();
  if (!urlText || hasHostBridgeControlCharacter(urlText)) {
    return null;
  }

  try {
    const url = new URL(urlText);
    if (
      !HOST_BRIDGE_EXTERNAL_URL_PROTOCOLS.includes(
        url.protocol as HostBridgeExternalUrlProtocol,
      )
    ) {
      return null;
    }

    return url.toString();
  } catch {
    return null;
  }
}

export function normalizeHostBridgeExternalUrlPayload(
  rawUrl: unknown,
): OpenExternalUrlPayload | null {
  const url = normalizeHostBridgeExternalUrl(rawUrl);
  return url ? { url } : null;
}

export type ClipboardWriteTextPayload = {
  text: string;
};

export type ClipboardReadTextResult = {
  text: string;
};

export const HOST_BRIDGE_CLIPBOARD_TEXT_MAX_LENGTH = 100000;

export function normalizeHostBridgeClipboardText(
  rawText: unknown,
): ClipboardReadTextResult | null {
  if (typeof rawText !== 'string') {
    return null;
  }

  return {
    text: rawText.slice(0, HOST_BRIDGE_CLIPBOARD_TEXT_MAX_LENGTH),
  };
}

export type FileExportTextPayload = {
  fileName: string;
  content: string;
  mimeType?: HostBridgeTextMimeType;
};

export type FileExportTextResult = {
  action: 'saved';
  fileName: string;
  bytes: number;
};

export type HostBridgeTextMimeType =
  | 'text/plain'
  | 'text/markdown'
  | 'text/csv'
  | 'application/json';

export const HOST_BRIDGE_TEXT_MIME_TYPES = [
  'text/plain',
  'text/markdown',
  'text/csv',
  'application/json',
] as const satisfies readonly HostBridgeTextMimeType[];

const HOST_BRIDGE_TEXT_MIME_TYPE_SET = new Set<HostBridgeTextMimeType>(
  HOST_BRIDGE_TEXT_MIME_TYPES,
);

export type FileImportTextResult = {
  action: 'selected';
  fileName: string;
  content: string;
  mimeType: HostBridgeTextMimeType;
  bytes: number;
};

export type HostBridgeDocumentMimeType =
  | HostBridgeTextMimeType
  | 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';

export const HOST_BRIDGE_DOCUMENT_MIME_TYPES = [
  ...HOST_BRIDGE_TEXT_MIME_TYPES,
  'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
] as const satisfies readonly HostBridgeDocumentMimeType[];

export type FileImportDocumentResult = {
  action: 'selected';
  fileName: string;
  base64Data: string;
  mimeType: HostBridgeDocumentMimeType;
  bytes: number;
};

export type FileExportImagePayload = {
  fileName: string;
  base64Data: string;
  mimeType: 'image/png' | 'image/jpeg' | 'image/webp';
};

export type FileExportImageResult = {
  action: 'saved';
  fileName: string;
  bytes: number;
};

export type HostBridgeImageMimeType = 'image/png' | 'image/jpeg' | 'image/webp';

export const HOST_BRIDGE_IMAGE_MIME_TYPES = [
  'image/png',
  'image/jpeg',
  'image/webp',
] as const satisfies readonly HostBridgeImageMimeType[];

const HOST_BRIDGE_IMAGE_MIME_TYPE_SET = new Set<HostBridgeImageMimeType>(
  HOST_BRIDGE_IMAGE_MIME_TYPES,
);

export type FileImportImageResult = {
  action: 'selected' | 'dropped' | 'captured';
  fileName: string;
  base64Data: string;
  mimeType: HostBridgeImageMimeType;
  bytes: number;
  position?: {
    x: number;
    y: number;
  };
};

export type ScannerScanQrCodeResult = {
  value: string;
  format: 'qr_code';
};

export const HOST_BRIDGE_QR_CODE_VALUE_MAX_LENGTH = 4096;

export function normalizeHostBridgeQrCodeValue(
  rawValue: unknown,
): ScannerScanQrCodeResult | null {
  if (typeof rawValue !== 'string') {
    return null;
  }

  const value = rawValue.trim();
  if (!value || hasHostBridgeControlCharacter(value)) {
    return null;
  }

  return {
    value: value.slice(0, HOST_BRIDGE_QR_CODE_VALUE_MAX_LENGTH),
    format: 'qr_code',
  };
}

export type HostBridgeAudioMimeType =
  | 'audio/mpeg'
  | 'audio/mp4'
  | 'audio/wav'
  | 'audio/ogg'
  | 'audio/webm';

export const HOST_BRIDGE_AUDIO_MIME_TYPES = [
  'audio/mpeg',
  'audio/mp4',
  'audio/wav',
  'audio/ogg',
  'audio/webm',
] as const satisfies readonly HostBridgeAudioMimeType[];

const HOST_BRIDGE_AUDIO_MIME_TYPE_SET = new Set<HostBridgeAudioMimeType>(
  HOST_BRIDGE_AUDIO_MIME_TYPES,
);

export type FileImportAudioResult = {
  action: 'selected';
  fileName: string;
  base64Data: string;
  mimeType: HostBridgeAudioMimeType;
  bytes: number;
};

export type FileExportAudioPayload = {
  fileName: string;
  base64Data: string;
  mimeType: HostBridgeAudioMimeType;
};

export type FileExportAudioResult = {
  action: 'saved';
  fileName: string;
  bytes: number;
};

export const HOST_BRIDGE_EXPORT_TEXT_MAX_BYTES = 5 * 1024 * 1024;
export const HOST_BRIDGE_IMPORT_TEXT_MAX_BYTES = 5 * 1024 * 1024;
export const HOST_BRIDGE_IMPORT_DOCUMENT_MAX_BYTES = 5 * 1024 * 1024;
export const HOST_BRIDGE_EXPORT_IMAGE_MAX_BYTES = 5 * 1024 * 1024;
export const HOST_BRIDGE_IMPORT_IMAGE_MAX_BYTES = 10 * 1024 * 1024;
export const HOST_BRIDGE_EXPORT_AUDIO_MAX_BYTES = 20 * 1024 * 1024;
export const HOST_BRIDGE_IMPORT_AUDIO_MAX_BYTES = 20 * 1024 * 1024;

function estimateHostBridgeUtf8Bytes(value: string) {
  return new TextEncoder().encode(value).length;
}

export function normalizeHostBridgeExportTextPayload(
  payload: unknown,
): FileExportTextPayload | null {
  if (!payload || typeof payload !== 'object') {
    return null;
  }

  const candidate = payload as Partial<FileExportTextPayload>;
  if (typeof candidate.content !== 'string') {
    return null;
  }

  if (
    estimateHostBridgeUtf8Bytes(candidate.content) >
    HOST_BRIDGE_EXPORT_TEXT_MAX_BYTES
  ) {
    return null;
  }

  const normalizedPayload: FileExportTextPayload = {
    fileName: normalizeHostBridgeExportFileName(candidate.fileName),
    content: candidate.content,
  };

  if (candidate.mimeType === undefined) {
    return normalizedPayload;
  }

  const mimeType = candidate.mimeType as HostBridgeTextMimeType;
  if (!HOST_BRIDGE_TEXT_MIME_TYPE_SET.has(mimeType)) {
    return null;
  }

  return {
    ...normalizedPayload,
    mimeType,
  };
}

function normalizeHostBridgeImportedBytes(rawBytes: unknown, maxBytes: number) {
  if (
    typeof rawBytes !== 'number' ||
    !Number.isInteger(rawBytes) ||
    rawBytes <= 0 ||
    rawBytes > maxBytes
  ) {
    return null;
  }

  return rawBytes;
}

export function normalizeHostBridgeImportFileName(rawFileName: unknown) {
  return normalizeHostBridgeExportFileName(rawFileName);
}

export function normalizeHostBridgeImportTextResult(
  payload: unknown,
): FileImportTextResult | null {
  if (!payload || typeof payload !== 'object') {
    return null;
  }

  const candidate = payload as Partial<FileImportTextResult>;
  if (candidate.action !== 'selected') {
    return null;
  }

  const fileName = normalizeHostBridgeImportFileName(candidate.fileName);
  const bytes = normalizeHostBridgeImportedBytes(
    candidate.bytes,
    HOST_BRIDGE_IMPORT_TEXT_MAX_BYTES,
  );
  const mimeType = candidate.mimeType as HostBridgeTextMimeType;
  if (
    !fileName ||
    bytes === null ||
    !HOST_BRIDGE_TEXT_MIME_TYPE_SET.has(mimeType) ||
    typeof candidate.content !== 'string' ||
    estimateHostBridgeUtf8Bytes(candidate.content) >
      HOST_BRIDGE_IMPORT_TEXT_MAX_BYTES
  ) {
    return null;
  }

  return {
    action: 'selected',
    fileName,
    content: candidate.content,
    mimeType,
    bytes,
  };
}

export function normalizeHostBridgeImportDocumentResult(
  payload: unknown,
): FileImportDocumentResult | null {
  if (!payload || typeof payload !== 'object') {
    return null;
  }

  const candidate = payload as Partial<FileImportDocumentResult>;
  if (candidate.action !== 'selected') {
    return null;
  }

  const fileName = normalizeHostBridgeImportFileName(candidate.fileName);
  const bytes = normalizeHostBridgeImportedBytes(
    candidate.bytes,
    HOST_BRIDGE_IMPORT_DOCUMENT_MAX_BYTES,
  );
  const mimeType = candidate.mimeType as HostBridgeDocumentMimeType;
  const base64Data = normalizeHostBridgeBase64Data(candidate.base64Data);
  if (
    !fileName ||
    bytes === null ||
    !HOST_BRIDGE_DOCUMENT_MIME_TYPES.includes(mimeType) ||
    !base64Data ||
    estimateHostBridgeBase64Bytes(base64Data) >
      HOST_BRIDGE_IMPORT_DOCUMENT_MAX_BYTES
  ) {
    return null;
  }

  return {
    action: 'selected',
    fileName,
    base64Data,
    mimeType,
    bytes,
  };
}

export function normalizeHostBridgeImportImageResult(
  payload: unknown,
): FileImportImageResult | null {
  if (!payload || typeof payload !== 'object') {
    return null;
  }

  const candidate = payload as Partial<FileImportImageResult>;
  if (
    candidate.action !== 'selected' &&
    candidate.action !== 'dropped' &&
    candidate.action !== 'captured'
  ) {
    return null;
  }

  const fileName = normalizeHostBridgeImportFileName(candidate.fileName);
  const bytes = normalizeHostBridgeImportedBytes(
    candidate.bytes,
    HOST_BRIDGE_IMPORT_IMAGE_MAX_BYTES,
  );
  const mimeType = candidate.mimeType as HostBridgeImageMimeType;
  const base64Data = normalizeHostBridgeBase64Data(candidate.base64Data);
  if (
    !fileName ||
    bytes === null ||
    !HOST_BRIDGE_IMAGE_MIME_TYPE_SET.has(mimeType) ||
    !base64Data ||
    estimateHostBridgeBase64Bytes(base64Data) >
      HOST_BRIDGE_IMPORT_IMAGE_MAX_BYTES
  ) {
    return null;
  }

  const position =
    candidate.position &&
    typeof candidate.position.x === 'number' &&
    Number.isFinite(candidate.position.x) &&
    typeof candidate.position.y === 'number' &&
    Number.isFinite(candidate.position.y)
      ? {
          x: candidate.position.x,
          y: candidate.position.y,
        }
      : undefined;

  return {
    action: candidate.action,
    fileName,
    base64Data,
    mimeType,
    bytes,
    ...(position ? { position } : {}),
  };
}

export function normalizeHostBridgeImportAudioResult(
  payload: unknown,
): FileImportAudioResult | null {
  if (!payload || typeof payload !== 'object') {
    return null;
  }

  const candidate = payload as Partial<FileImportAudioResult>;
  if (candidate.action !== 'selected') {
    return null;
  }

  const fileName = normalizeHostBridgeImportFileName(candidate.fileName);
  const bytes = normalizeHostBridgeImportedBytes(
    candidate.bytes,
    HOST_BRIDGE_IMPORT_AUDIO_MAX_BYTES,
  );
  const mimeType = candidate.mimeType as HostBridgeAudioMimeType;
  const base64Data = normalizeHostBridgeBase64Data(candidate.base64Data);
  if (
    !fileName ||
    bytes === null ||
    !HOST_BRIDGE_AUDIO_MIME_TYPE_SET.has(mimeType) ||
    !base64Data ||
    estimateHostBridgeBase64Bytes(base64Data) >
      HOST_BRIDGE_IMPORT_AUDIO_MAX_BYTES
  ) {
    return null;
  }

  return {
    action: 'selected',
    fileName,
    base64Data,
    mimeType,
    bytes,
  };
}

function normalizeHostBridgeBase64Data(rawData: unknown) {
  if (typeof rawData !== 'string') {
    return null;
  }

  const base64Data = rawData.trim();
  if (!base64Data || hasHostBridgeControlCharacter(base64Data)) {
    return null;
  }

  return base64Data;
}

function estimateHostBridgeBase64Bytes(base64Data: string) {
  const normalizedLength = base64Data.replace(/\s+/g, '').length;
  return Math.ceil((normalizedLength * 3) / 4);
}

export function normalizeHostBridgeExportImagePayload(
  payload: unknown,
): FileExportImagePayload | null {
  if (!payload || typeof payload !== 'object') {
    return null;
  }

  const candidate = payload as Partial<FileExportImagePayload>;
  const mimeType = candidate.mimeType as HostBridgeImageMimeType;
  if (!HOST_BRIDGE_IMAGE_MIME_TYPE_SET.has(mimeType)) {
    return null;
  }

  const base64Data = normalizeHostBridgeBase64Data(candidate.base64Data);
  if (
    !base64Data ||
    estimateHostBridgeBase64Bytes(base64Data) >
      HOST_BRIDGE_EXPORT_IMAGE_MAX_BYTES
  ) {
    return null;
  }

  return {
    fileName: normalizeHostBridgeExportFileName(candidate.fileName),
    base64Data,
    mimeType,
  };
}

export function normalizeHostBridgeExportAudioPayload(
  payload: unknown,
): FileExportAudioPayload | null {
  if (!payload || typeof payload !== 'object') {
    return null;
  }

  const candidate = payload as Partial<FileExportAudioPayload>;
  const mimeType = candidate.mimeType as HostBridgeAudioMimeType;
  if (!HOST_BRIDGE_AUDIO_MIME_TYPE_SET.has(mimeType)) {
    return null;
  }

  const base64Data = normalizeHostBridgeBase64Data(candidate.base64Data);
  if (
    !base64Data ||
    estimateHostBridgeBase64Bytes(base64Data) >
      HOST_BRIDGE_EXPORT_AUDIO_MAX_BYTES
  ) {
    return null;
  }

  return {
    fileName: normalizeHostBridgeExportFileName(candidate.fileName),
    base64Data,
    mimeType,
  };
}

export const HOST_BRIDGE_HAPTICS_IMPACT_STYLES = [
  'light',
  'medium',
  'heavy',
] as const;

export type HostBridgeHapticsImpactStyle =
  (typeof HOST_BRIDGE_HAPTICS_IMPACT_STYLES)[number];

export function normalizeHostBridgeHapticsImpactStyle(rawStyle: unknown) {
  if (rawStyle === undefined) {
    return 'light';
  }

  return HOST_BRIDGE_HAPTICS_IMPACT_STYLES.includes(
    rawStyle as HostBridgeHapticsImpactStyle,
  )
    ? (rawStyle as HostBridgeHapticsImpactStyle)
    : null;
}

export type HapticsImpactPayload = {
  style?: HostBridgeHapticsImpactStyle;
};

export type LocalNotificationPayload = {
  title: string;
  body?: string;
};

export type LocalNotificationResult = {
  action: 'delivered_to_system';
};

export const HOST_BRIDGE_LOCAL_NOTIFICATION_DELIVERED_TO_SYSTEM_RESULT: LocalNotificationResult =
  {
    action: 'delivered_to_system',
  };

export const HOST_BRIDGE_LOCAL_NOTIFICATION_TITLE_MAX_LENGTH = 80;
export const HOST_BRIDGE_LOCAL_NOTIFICATION_BODY_MAX_LENGTH = 240;
export const HOST_BRIDGE_MOBILE_LOCAL_NOTIFICATION_CHANNEL_ID =
  'genarrative-local';

function normalizeHostBridgePlainText(
  value: unknown,
  maxLength: number,
  required: boolean,
) {
  if (typeof value !== 'string') {
    return required ? null : undefined;
  }

  if (hasHostBridgeControlCharacter(value)) {
    return null;
  }

  const text = value.trim().replace(/\s+/g, ' ');
  if (!text) {
    return required ? null : undefined;
  }

  return text.slice(0, maxLength);
}

export function normalizeHostBridgeLocalNotification(
  payload: unknown,
): LocalNotificationPayload | null {
  if (!payload || typeof payload !== 'object') {
    return null;
  }

  const candidate = payload as Partial<LocalNotificationPayload>;
  const title = normalizeHostBridgePlainText(
    candidate.title,
    HOST_BRIDGE_LOCAL_NOTIFICATION_TITLE_MAX_LENGTH,
    true,
  );
  if (!title) {
    return null;
  }

  const body = normalizeHostBridgePlainText(
    candidate.body,
    HOST_BRIDGE_LOCAL_NOTIFICATION_BODY_MAX_LENGTH,
    false,
  );
  if (body === null) {
    return null;
  }

  return body ? { title, body } : { title };
}

export type ShareSetTargetPayload = {
  target: unknown;
};

export type ShareOpenPayload = {
  title?: string;
  message?: string;
  url?: string;
  href?: string;
  path?: string;
  targetPath?: string;
  work?: string;
};

export type HostBridgeSharePayloadNormalization =
  | { status: 'empty' }
  | { status: 'invalid' }
  | { status: 'valid'; payload: ShareOpenPayload };

function hostBridgeStringField(value: unknown, field: string) {
  if (!value || typeof value !== 'object') {
    return undefined;
  }

  const fieldValue = (value as Record<string, unknown>)[field];
  if (typeof fieldValue !== 'string') {
    return undefined;
  }

  const text = fieldValue.trim();
  return text || undefined;
}

function hostBridgeShareTargetPayload(value: unknown) {
  if (!value || typeof value !== 'object') {
    return value;
  }

  const target = value as Record<string, unknown>;
  return target.target ?? value;
}

function normalizeHostBridgePublicShareUrl(rawUrl: string | undefined) {
  if (!rawUrl || rawUrl.startsWith('//')) {
    return undefined;
  }

  try {
    const url = new URL(rawUrl, HOST_BRIDGE_PUBLIC_WEB_ORIGIN);
    if (url.origin !== HOST_BRIDGE_PUBLIC_WEB_ORIGIN) {
      return undefined;
    }

    return url.toString();
  } catch {
    return undefined;
  }
}

function hostBridgeWorkDetailUrl(work: string) {
  const searchParams = new URLSearchParams({ work });
  return `${HOST_BRIDGE_PUBLIC_WEB_ORIGIN}/works/detail?${searchParams.toString()}`;
}

export function normalizeHostBridgeShareOpenPayload(
  value: unknown,
): HostBridgeSharePayloadNormalization {
  const target = hostBridgeShareTargetPayload(value);
  const payload =
    target && typeof target === 'object'
      ? ((target as Record<string, unknown>).payload ?? target)
      : target;

  if (!payload || typeof payload !== 'object') {
    return { status: 'empty' };
  }

  const title = hostBridgeStringField(payload, 'title');
  const message = hostBridgeStringField(payload, 'message');
  const rawDirectUrl =
    hostBridgeStringField(payload, 'url') ??
    hostBridgeStringField(payload, 'href');
  const directUrl = normalizeHostBridgePublicShareUrl(rawDirectUrl);
  if (rawDirectUrl && !directUrl) {
    return { status: 'invalid' };
  }

  const work = hostBridgeStringField(payload, 'work');
  const rawPath =
    hostBridgeStringField(payload, 'path') ??
    hostBridgeStringField(payload, 'targetPath');
  const pathUrl = normalizeHostBridgePublicShareUrl(rawPath);
  if (rawPath && !pathUrl) {
    return { status: 'invalid' };
  }

  const url =
    directUrl ?? (work ? hostBridgeWorkDetailUrl(work) : undefined) ?? pathUrl;
  if (!title && !message && !url) {
    return { status: 'empty' };
  }

  return {
    status: 'valid',
    payload: {
      ...(title ? { title } : {}),
      ...(message ? { message } : {}),
      ...(url ? { url } : {}),
    },
  };
}

export const HOST_BRIDGE_FILE_NAME_FALLBACK = 'genarrative-export.txt';
export const HOST_BRIDGE_FILE_NAME_MAX_LENGTH = 120;

function isHostBridgeInvalidFileNameCharacter(value: string) {
  if (hasHostBridgeControlCharacter(value)) {
    return true;
  }

  return ['<', '>', ':', '"', '/', '\\', '|', '?', '*'].includes(value);
}

export function normalizeHostBridgeExportFileName(rawFileName: unknown) {
  if (typeof rawFileName !== 'string') {
    return HOST_BRIDGE_FILE_NAME_FALLBACK;
  }

  const fileName = rawFileName
    .trim()
    .split('')
    .map((character) =>
      isHostBridgeInvalidFileNameCharacter(character) ? '-' : character,
    )
    .join('')
    .replace(/\s+/g, ' ')
    .replace(/^[.\s-]+/, '')
    .slice(0, HOST_BRIDGE_FILE_NAME_MAX_LENGTH)
    .trim();

  return fileName || HOST_BRIDGE_FILE_NAME_FALLBACK;
}