import * as plugins from '../plugins.js';
import { IStorageConfig, IStorageBackend } from './interfaces.core.js';

/**
 * Storage abstraction layer for registry
 * Provides a unified interface over SmartBucket
 */
export class RegistryStorage implements IStorageBackend {
  private smartBucket: plugins.smartbucket.SmartBucket;
  private bucket: plugins.smartbucket.Bucket;
  private bucketName: string;

  constructor(private config: IStorageConfig) {
    this.bucketName = config.bucketName;
  }

  /**
   * Initialize the storage backend
   */
  public async init(): Promise<void> {
    this.smartBucket = new plugins.smartbucket.SmartBucket({
      accessKey: this.config.accessKey,
      accessSecret: this.config.accessSecret,
      endpoint: this.config.endpoint,
      port: this.config.port || 443,
      useSsl: this.config.useSsl !== false,
      region: this.config.region || 'us-east-1',
    });

    // Ensure bucket exists
    await this.smartBucket.createBucket(this.bucketName).catch(() => {
      // Bucket may already exist
    });

    this.bucket = await this.smartBucket.getBucketByName(this.bucketName);
  }

  /**
   * Get an object from storage
   */
  public async getObject(key: string): Promise<Buffer | null> {
    try {
      return await this.bucket.fastGet({ path: key });
    } catch (error) {
      return null;
    }
  }

  /**
   * Store an object
   */
  public async putObject(
    key: string,
    data: Buffer,
    metadata?: Record<string, string>
  ): Promise<void> {
    await this.bucket.fastPut({
      path: key,
      contents: data,
      meta: metadata,
    });
  }

  /**
   * Delete an object
   */
  public async deleteObject(key: string): Promise<void> {
    await this.bucket.fastRemove({ path: key });
  }

  /**
   * List objects with a prefix
   */
  public async listObjects(prefix: string): Promise<string[]> {
    const baseDir = await this.bucket.getBaseDirectory();
    const dir = prefix ? await baseDir.getSubDirectoryByName(prefix) : baseDir;
    if (!dir) return [];

    const files = await dir.listFiles();
    return files.map(f => f.path);
  }

  /**
   * Check if an object exists
   */
  public async objectExists(key: string): Promise<boolean> {
    return await this.bucket.fastExists({ path: key });
  }

  /**
   * Get object metadata
   * Note: SmartBucket may not support metadata retrieval, returning empty object
   */
  public async getMetadata(key: string): Promise<Record<string, string> | null> {
    // SmartBucket doesn't expose metadata retrieval directly
    // This is a limitation we'll document
    const exists = await this.objectExists(key);
    return exists ? {} : null;
  }

  // ========================================================================
  // OCI-SPECIFIC HELPERS
  // ========================================================================

  /**
   * Get OCI blob by digest
   */
  public async getOciBlob(digest: string): Promise<Buffer | null> {
    const path = this.getOciBlobPath(digest);
    return this.getObject(path);
  }

  /**
   * Store OCI blob
   */
  public async putOciBlob(digest: string, data: Buffer): Promise<void> {
    const path = this.getOciBlobPath(digest);
    return this.putObject(path, data);
  }

  /**
   * Check if OCI blob exists
   */
  public async ociBlobExists(digest: string): Promise<boolean> {
    const path = this.getOciBlobPath(digest);
    return this.objectExists(path);
  }

  /**
   * Delete OCI blob
   */
  public async deleteOciBlob(digest: string): Promise<void> {
    const path = this.getOciBlobPath(digest);
    return this.deleteObject(path);
  }

  /**
   * Get OCI manifest
   */
  public async getOciManifest(repository: string, digest: string): Promise<Buffer | null> {
    const path = this.getOciManifestPath(repository, digest);
    return this.getObject(path);
  }

  /**
   * Store OCI manifest
   */
  public async putOciManifest(
    repository: string,
    digest: string,
    data: Buffer,
    contentType: string
  ): Promise<void> {
    const path = this.getOciManifestPath(repository, digest);
    return this.putObject(path, data, { 'Content-Type': contentType });
  }

  /**
   * Check if OCI manifest exists
   */
  public async ociManifestExists(repository: string, digest: string): Promise<boolean> {
    const path = this.getOciManifestPath(repository, digest);
    return this.objectExists(path);
  }

  /**
   * Delete OCI manifest
   */
  public async deleteOciManifest(repository: string, digest: string): Promise<void> {
    const path = this.getOciManifestPath(repository, digest);
    return this.deleteObject(path);
  }

  // ========================================================================
  // NPM-SPECIFIC HELPERS
  // ========================================================================

  /**
   * Get NPM packument (package document)
   */
  public async getNpmPackument(packageName: string): Promise<any | null> {
    const path = this.getNpmPackumentPath(packageName);
    const data = await this.getObject(path);
    return data ? JSON.parse(data.toString('utf-8')) : null;
  }

  /**
   * Store NPM packument
   */
  public async putNpmPackument(packageName: string, packument: any): Promise<void> {
    const path = this.getNpmPackumentPath(packageName);
    const data = Buffer.from(JSON.stringify(packument, null, 2), 'utf-8');
    return this.putObject(path, data, { 'Content-Type': 'application/json' });
  }

  /**
   * Check if NPM packument exists
   */
  public async npmPackumentExists(packageName: string): Promise<boolean> {
    const path = this.getNpmPackumentPath(packageName);
    return this.objectExists(path);
  }

  /**
   * Delete NPM packument
   */
  public async deleteNpmPackument(packageName: string): Promise<void> {
    const path = this.getNpmPackumentPath(packageName);
    return this.deleteObject(path);
  }

  /**
   * Get NPM tarball
   */
  public async getNpmTarball(packageName: string, version: string): Promise<Buffer | null> {
    const path = this.getNpmTarballPath(packageName, version);
    return this.getObject(path);
  }

  /**
   * Store NPM tarball
   */
  public async putNpmTarball(
    packageName: string,
    version: string,
    tarball: Buffer
  ): Promise<void> {
    const path = this.getNpmTarballPath(packageName, version);
    return this.putObject(path, tarball, { 'Content-Type': 'application/octet-stream' });
  }

  /**
   * Check if NPM tarball exists
   */
  public async npmTarballExists(packageName: string, version: string): Promise<boolean> {
    const path = this.getNpmTarballPath(packageName, version);
    return this.objectExists(path);
  }

  /**
   * Delete NPM tarball
   */
  public async deleteNpmTarball(packageName: string, version: string): Promise<void> {
    const path = this.getNpmTarballPath(packageName, version);
    return this.deleteObject(path);
  }

  // ========================================================================
  // PATH HELPERS
  // ========================================================================

  private getOciBlobPath(digest: string): string {
    const hash = digest.split(':')[1];
    return `oci/blobs/sha256/${hash}`;
  }

  private getOciManifestPath(repository: string, digest: string): string {
    const hash = digest.split(':')[1];
    return `oci/manifests/${repository}/${hash}`;
  }

  private getNpmPackumentPath(packageName: string): string {
    return `npm/packages/${packageName}/index.json`;
  }

  private getNpmTarballPath(packageName: string, version: string): string {
    const safeName = packageName.replace('@', '').replace('/', '-');
    return `npm/packages/${packageName}/${safeName}-${version}.tgz`;
  }
}