import libentry, { NativeDirectoryEntry as LibNativeDirectoryEntry, NativeModule as LibNativeModule } from 'libentry.so';

export interface SmbConnectionOptions {
  host: string;
  share: string;
  username: string;
  password: string;
  domain?: string;
}

export interface SmbListOptions extends SmbConnectionOptions {
  path?: string;
}

export interface SmbDeleteOptions extends SmbConnectionOptions {
  path: string;
  isDirectory?: boolean;
}

export interface SmbCreateOptions extends SmbConnectionOptions {
  path: string;
}

export interface SmbRenameOptions extends SmbConnectionOptions {
  path: string;
  newPath: string;
}

export interface SmbDirectoryEntry {
  name: string;
  isDirectory: boolean;
  isFile: boolean;
  size: number;
}

export type NativeDirectoryEntry = LibNativeDirectoryEntry;

const bridge: LibNativeModule = libentry as LibNativeModule;

export class NativeSambaTree {
  private closed = false;
  private readonly treeId: number;

  constructor(treeId: number) {
    this.treeId = treeId;
  }

  private normalizePath(input?: string): string {
    if (!input) {
      return '';
    }
    const cleaned = input.replace(/^[\\/]+/, '').replace(/\\/g, '/');
    return cleaned;
  }

  private ensureOpen(): void {
    if (this.closed) {
      throw new Error('SMB tree has been closed');
    }
  }

  async readDirectory(path?: string): Promise<NativeDirectoryEntry[]> {
    this.ensureOpen();
    const normalized = this.normalizePath(path);
    return bridge.readDirectory(this.treeId, normalized) ?? [];
  }

  deleteEntry(path?: string, isDirectory: boolean = false): void {
    this.ensureOpen();
    const normalized = this.normalizePath(path);
    bridge.deleteEntry(this.treeId, normalized, isDirectory);
  }

  createDirectory(path?: string): void {
    this.ensureOpen();
    const normalized = this.normalizePath(path);
    bridge.createDirectory(this.treeId, normalized);
  }

  renameEntry(path?: string, newPath?: string): void {
    this.ensureOpen();
    const normalized = this.normalizePath(path);
    const normalizedNew = this.normalizePath(newPath);
    bridge.renameEntry(this.treeId, normalized, normalizedNew);
  }

  async close(): Promise<void> {
    if (this.closed) {
      return;
    }
    bridge.disconnectTree(this.treeId);
    this.closed = true;
  }
}

export class NativeSambaSession {
  private closed = false;
  private readonly sessionId: number;

  constructor(sessionId: number) {
    this.sessionId = sessionId;
  }

  private ensureOpen(): void {
    if (this.closed) {
      throw new Error('SMB session has been closed');
    }
  }

  async connectTree(share: string): Promise<NativeSambaTree> {
    this.ensureOpen();
    const treeId = Number(bridge.connectTree(this.sessionId, share));
    return new NativeSambaTree(treeId);
  }

  async disconnect(): Promise<void> {
    if (this.closed) {
      return;
    }
    bridge.disconnectSession(this.sessionId);
    this.closed = true;
  }
}

export class NativeSambaClient {
  private readonly clientId: number;
  private closed = false;

  constructor(host: string) {
    this.clientId = bridge.createClient(host);
  }

  private ensureOpen(): void {
    if (this.closed) {
      throw new Error('SMB client has been closed');
    }
  }

  async authenticate(options: SmbConnectionOptions): Promise<NativeSambaSession> {
    this.ensureOpen();
    const sessionId = Number(
      bridge.authenticate(this.clientId, options.username, options.password, options.domain)
    );
    return new NativeSambaSession(sessionId);
  }

  async close(): Promise<void> {
    if (this.closed) {
      return;
    }
    bridge.destroyClient(this.clientId);
    this.closed = true;
  }
}

async function withSmbTree<T>(options: SmbConnectionOptions, handler: (tree: NativeSambaTree) => Promise<T>): Promise<T> {
  const client = new NativeSambaClient(options.host);
  let session: NativeSambaSession | undefined;
  let tree: NativeSambaTree | undefined;
  try {
    session = await client.authenticate(options);
    tree = await session.connectTree(options.share);
    return await handler(tree);
  } finally {
    await tree?.close();
    await session?.disconnect();
    await client.close();
  }
}

export async function listSmbDirectory(options: SmbListOptions): Promise<SmbDirectoryEntry[]> {
  const entries = await withSmbTree(options, (tree: NativeSambaTree) => tree.readDirectory(options.path));
  return entries.map((entry: NativeDirectoryEntry): SmbDirectoryEntry => ({
    name: entry.name ?? entry.fileName ?? 'unknown',
    isDirectory: Boolean(entry.isDirectory),
    isFile: Boolean(entry.isFile),
    size: entry.size ?? 0
  }));
}

export async function deleteSmbEntry(options: SmbDeleteOptions): Promise<void> {
  if (!options.path || options.path.length === 0) {
    throw new Error('Remote path must not be empty');
  }
  await withSmbTree(options, async (tree: NativeSambaTree) => {
    tree.deleteEntry(options.path, options.isDirectory === true);
  });
}

export async function createSmbDirectory(options: SmbCreateOptions): Promise<void> {
  if (!options.path || options.path.length === 0) {
    throw new Error('Remote path must not be empty');
  }
  await withSmbTree(options, async (tree: NativeSambaTree) => {
    tree.createDirectory(options.path);
  });
}

export async function renameSmbEntry(options: SmbRenameOptions): Promise<void> {
  if (!options.path || options.path.length === 0) {
    throw new Error('Remote path must not be empty');
  }
  if (!options.newPath || options.newPath.length === 0) {
    throw new Error('New remote path must not be empty');
  }
  await withSmbTree(options, async (tree: NativeSambaTree) => {
    tree.renameEntry(options.path, options.newPath);
  });
}