import * as plugins from '../plugins.js';
import type { 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> {
    // Note: SmartBucket doesn't support metadata yet
    await this.bucket.fastPut({
      path: key,
      contents: data,
      overwrite: true, // Always overwrite existing objects
    });
  }

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

  /**
   * List objects with a prefix (recursively)
   */
  public async listObjects(prefix: string): Promise<string[]> {
    const paths: string[] = [];
    for await (const path of this.bucket.listAllObjects(prefix)) {
      paths.push(path);
    }
    return paths;
  }

  /**
   * 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`;
  }

  // ========================================================================
  // MAVEN STORAGE METHODS
  // ========================================================================

  /**
   * Get Maven artifact
   */
  public async getMavenArtifact(
    groupId: string,
    artifactId: string,
    version: string,
    filename: string
  ): Promise<Buffer | null> {
    const path = this.getMavenArtifactPath(groupId, artifactId, version, filename);
    return this.getObject(path);
  }

  /**
   * Store Maven artifact
   */
  public async putMavenArtifact(
    groupId: string,
    artifactId: string,
    version: string,
    filename: string,
    data: Buffer
  ): Promise<void> {
    const path = this.getMavenArtifactPath(groupId, artifactId, version, filename);
    return this.putObject(path, data);
  }

  /**
   * Check if Maven artifact exists
   */
  public async mavenArtifactExists(
    groupId: string,
    artifactId: string,
    version: string,
    filename: string
  ): Promise<boolean> {
    const path = this.getMavenArtifactPath(groupId, artifactId, version, filename);
    return this.objectExists(path);
  }

  /**
   * Delete Maven artifact
   */
  public async deleteMavenArtifact(
    groupId: string,
    artifactId: string,
    version: string,
    filename: string
  ): Promise<void> {
    const path = this.getMavenArtifactPath(groupId, artifactId, version, filename);
    return this.deleteObject(path);
  }

  /**
   * Get Maven metadata (maven-metadata.xml)
   */
  public async getMavenMetadata(
    groupId: string,
    artifactId: string
  ): Promise<Buffer | null> {
    const path = this.getMavenMetadataPath(groupId, artifactId);
    return this.getObject(path);
  }

  /**
   * Store Maven metadata (maven-metadata.xml)
   */
  public async putMavenMetadata(
    groupId: string,
    artifactId: string,
    data: Buffer
  ): Promise<void> {
    const path = this.getMavenMetadataPath(groupId, artifactId);
    return this.putObject(path, data);
  }

  /**
   * List Maven versions for an artifact
   * Returns all version directories under the artifact path
   */
  public async listMavenVersions(
    groupId: string,
    artifactId: string
  ): Promise<string[]> {
    const groupPath = groupId.replace(/\./g, '/');
    const prefix = `maven/artifacts/${groupPath}/${artifactId}/`;

    const objects = await this.listObjects(prefix);
    const versions = new Set<string>();

    // Extract version from paths like: maven/artifacts/com/example/my-lib/1.0.0/my-lib-1.0.0.jar
    for (const obj of objects) {
      const relativePath = obj.substring(prefix.length);
      const parts = relativePath.split('/');
      if (parts.length >= 1 && parts[0]) {
        versions.add(parts[0]);
      }
    }

    return Array.from(versions).sort();
  }

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

  private getMavenArtifactPath(
    groupId: string,
    artifactId: string,
    version: string,
    filename: string
  ): string {
    const groupPath = groupId.replace(/\./g, '/');
    return `maven/artifacts/${groupPath}/${artifactId}/${version}/${filename}`;
  }

  private getMavenMetadataPath(groupId: string, artifactId: string): string {
    const groupPath = groupId.replace(/\./g, '/');
    return `maven/metadata/${groupPath}/${artifactId}/maven-metadata.xml`;
  }

  // ========================================================================
  // CARGO-SPECIFIC HELPERS
  // ========================================================================

  /**
   * Get Cargo config.json
   */
  public async getCargoConfig(): Promise<any | null> {
    const data = await this.getObject('cargo/config.json');
    return data ? JSON.parse(data.toString('utf-8')) : null;
  }

  /**
   * Store Cargo config.json
   */
  public async putCargoConfig(config: any): Promise<void> {
    const data = Buffer.from(JSON.stringify(config, null, 2), 'utf-8');
    return this.putObject('cargo/config.json', data, { 'Content-Type': 'application/json' });
  }

  /**
   * Get Cargo index file (newline-delimited JSON)
   */
  public async getCargoIndex(crateName: string): Promise<any[] | null> {
    const path = this.getCargoIndexPath(crateName);
    const data = await this.getObject(path);
    if (!data) return null;

    // Parse newline-delimited JSON
    const lines = data.toString('utf-8').split('\n').filter(line => line.trim());
    return lines.map(line => JSON.parse(line));
  }

  /**
   * Store Cargo index file
   */
  public async putCargoIndex(crateName: string, entries: any[]): Promise<void> {
    const path = this.getCargoIndexPath(crateName);
    // Convert to newline-delimited JSON
    const data = Buffer.from(entries.map(e => JSON.stringify(e)).join('\n') + '\n', 'utf-8');
    return this.putObject(path, data, { 'Content-Type': 'text/plain' });
  }

  /**
   * Get Cargo .crate file
   */
  public async getCargoCrate(crateName: string, version: string): Promise<Buffer | null> {
    const path = this.getCargoCratePath(crateName, version);
    return this.getObject(path);
  }

  /**
   * Store Cargo .crate file
   */
  public async putCargoCrate(
    crateName: string,
    version: string,
    crateFile: Buffer
  ): Promise<void> {
    const path = this.getCargoCratePath(crateName, version);
    return this.putObject(path, crateFile, { 'Content-Type': 'application/gzip' });
  }

  /**
   * Check if Cargo crate exists
   */
  public async cargoCrateExists(crateName: string, version: string): Promise<boolean> {
    const path = this.getCargoCratePath(crateName, version);
    return this.objectExists(path);
  }

  /**
   * Delete Cargo crate (for cleanup, not for unpublishing)
   */
  public async deleteCargoCrate(crateName: string, version: string): Promise<void> {
    const path = this.getCargoCratePath(crateName, version);
    return this.deleteObject(path);
  }

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

  private getCargoIndexPath(crateName: string): string {
    const lower = crateName.toLowerCase();
    const len = lower.length;

    if (len === 1) {
      return `cargo/index/1/${lower}`;
    } else if (len === 2) {
      return `cargo/index/2/${lower}`;
    } else if (len === 3) {
      return `cargo/index/3/${lower.charAt(0)}/${lower}`;
    } else {
      // 4+ characters: {first-two}/{second-two}/{name}
      const prefix1 = lower.substring(0, 2);
      const prefix2 = lower.substring(2, 4);
      return `cargo/index/${prefix1}/${prefix2}/${lower}`;
    }
  }

  private getCargoCratePath(crateName: string, version: string): string {
    return `cargo/crates/${crateName}/${crateName}-${version}.crate`;
  }

  // ========================================================================
  // COMPOSER-SPECIFIC HELPERS
  // ========================================================================

  /**
   * Get Composer package metadata
   */
  public async getComposerPackageMetadata(vendorPackage: string): Promise<any | null> {
    const path = this.getComposerMetadataPath(vendorPackage);
    const data = await this.getObject(path);
    return data ? JSON.parse(data.toString('utf-8')) : null;
  }

  /**
   * Store Composer package metadata
   */
  public async putComposerPackageMetadata(vendorPackage: string, metadata: any): Promise<void> {
    const path = this.getComposerMetadataPath(vendorPackage);
    const data = Buffer.from(JSON.stringify(metadata, null, 2), 'utf-8');
    return this.putObject(path, data, { 'Content-Type': 'application/json' });
  }

  /**
   * Get Composer package ZIP
   */
  public async getComposerPackageZip(vendorPackage: string, reference: string): Promise<Buffer | null> {
    const path = this.getComposerZipPath(vendorPackage, reference);
    return this.getObject(path);
  }

  /**
   * Store Composer package ZIP
   */
  public async putComposerPackageZip(vendorPackage: string, reference: string, zipData: Buffer): Promise<void> {
    const path = this.getComposerZipPath(vendorPackage, reference);
    return this.putObject(path, zipData, { 'Content-Type': 'application/zip' });
  }

  /**
   * Check if Composer package metadata exists
   */
  public async composerPackageMetadataExists(vendorPackage: string): Promise<boolean> {
    const path = this.getComposerMetadataPath(vendorPackage);
    return this.objectExists(path);
  }

  /**
   * Delete Composer package metadata
   */
  public async deleteComposerPackageMetadata(vendorPackage: string): Promise<void> {
    const path = this.getComposerMetadataPath(vendorPackage);
    return this.deleteObject(path);
  }

  /**
   * Delete Composer package ZIP
   */
  public async deleteComposerPackageZip(vendorPackage: string, reference: string): Promise<void> {
    const path = this.getComposerZipPath(vendorPackage, reference);
    return this.deleteObject(path);
  }

  /**
   * List all Composer packages
   */
  public async listComposerPackages(): Promise<string[]> {
    const prefix = 'composer/packages/';
    const objects = await this.listObjects(prefix);
    const packages = new Set<string>();

    // Extract vendor/package from paths like: composer/packages/vendor/package/metadata.json
    for (const obj of objects) {
      const match = obj.match(/^composer\/packages\/([^\/]+\/[^\/]+)\/metadata\.json$/);
      if (match) {
        packages.add(match[1]);
      }
    }

    return Array.from(packages).sort();
  }

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

  private getComposerMetadataPath(vendorPackage: string): string {
    return `composer/packages/${vendorPackage}/metadata.json`;
  }

  private getComposerZipPath(vendorPackage: string, reference: string): string {
    return `composer/packages/${vendorPackage}/${reference}.zip`;
  }
}