export interface DriveLsEntry {
  path: string
  type: "dir" | "file"
  lastmod: number
  blob: string | null
  size: number | null
  author: string
}

export interface DriveTreeNode {
  path: string
  name: string
  type: "dir" | "file"
  lastmod: number
  blob: string | null
  size: number | null
  author: string
  children?: DriveTreeNode[]  // Only for directories
}

export interface DriveTreeResponse {
  root: DriveTreeNode[]
}

// Base interface for all log entries with common fields
export interface DriveLogEntryBase {
  timestamp: number
  revision: number  // Changed from log_id to match Rust OperationHeader
  email: string
}

// Specific log entry types based on Rust OperationData variants
export interface DriveLogEntryCreateFile extends DriveLogEntryBase {
  action: "create_file"
  path: string
  blob_id: string
  size: number
}

export interface DriveLogEntryCreateDir extends DriveLogEntryBase {
  action: "create_dir"
  path: string
}

export interface DriveLogEntryRemove extends DriveLogEntryBase {
  action: "remove"
  path: string
}

export interface DriveLogEntryRename extends DriveLogEntryBase {
  action: "rename"
  old_path: string
  new_path: string
}

// Discriminated union of all possible log entry types
export type DriveLogEntry = 
  | DriveLogEntryCreateFile
  | DriveLogEntryCreateDir
  | DriveLogEntryRemove
  | DriveLogEntryRename

// Type guards for working with discriminated unions
export function isCreateFileEntry(entry: DriveLogEntry): entry is DriveLogEntryCreateFile {
  return entry.action === "create_file"
}

export function isCreateDirEntry(entry: DriveLogEntry): entry is DriveLogEntryCreateDir {
  return entry.action === "create_dir"
}

export function isRemoveEntry(entry: DriveLogEntry): entry is DriveLogEntryRemove {
  return entry.action === "remove"
}

export function isRenameEntry(entry: DriveLogEntry): entry is DriveLogEntryRename {
  return entry.action === "rename"
}