/**
 * IStorageHooks implementation for smartregistry
 * Integrates Stack.Gallery's storage with smartregistry
 */

import * as plugins from '../plugins.ts';
import type { TRegistryProtocol } from '../interfaces/auth.interfaces.ts';
import { Package } from '../models/package.ts';
import { Repository } from '../models/repository.ts';
import { Organization } from '../models/organization.ts';
import { AuditService } from '../services/audit.service.ts';

export interface IStorageConfig {
  bucket: plugins.smartbucket.SmartBucket;
  basePath: string;
}

/**
 * Storage hooks implementation that tracks packages in MongoDB
 * and stores artifacts in S3 via smartbucket
 */
export class StackGalleryStorageHooks implements plugins.smartregistry.IStorageHooks {
  private config: IStorageConfig;

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

  /**
   * Called before a package is stored
   * Use this to validate, transform, or prepare for storage
   */
  public async beforeStore(context: plugins.smartregistry.IStorageContext): Promise<plugins.smartregistry.IStorageContext> {
    // Validate organization exists and has quota
    const org = await Organization.findById(context.organizationId);
    if (!org) {
      throw new Error(`Organization not found: ${context.organizationId}`);
    }

    // Check storage quota
    const newSize = context.size || 0;
    if (org.settings.quotas.maxStorageBytes > 0) {
      if (org.usedStorageBytes + newSize > org.settings.quotas.maxStorageBytes) {
        throw new Error('Organization storage quota exceeded');
      }
    }

    // Validate repository exists
    const repo = await Repository.findById(context.repositoryId);
    if (!repo) {
      throw new Error(`Repository not found: ${context.repositoryId}`);
    }

    // Check repository protocol
    if (!repo.protocols.includes(context.protocol as TRegistryProtocol)) {
      throw new Error(`Repository does not support ${context.protocol} protocol`);
    }

    return context;
  }

  /**
   * Called after a package is successfully stored
   * Update database records and metrics
   */
  public async afterStore(context: plugins.smartregistry.IStorageContext): Promise<void> {
    const protocol = context.protocol as TRegistryProtocol;
    const packageId = Package.generateId(protocol, context.organizationName, context.packageName);

    // Get or create package record
    let pkg = await Package.findById(packageId);
    if (!pkg) {
      pkg = new Package();
      pkg.id = packageId;
      pkg.organizationId = context.organizationId;
      pkg.repositoryId = context.repositoryId;
      pkg.protocol = protocol;
      pkg.name = context.packageName;
      pkg.createdById = context.actorId || '';
      pkg.createdAt = new Date();
    }

    // Add version
    pkg.addVersion({
      version: context.version,
      publishedAt: new Date(),
      publishedBy: context.actorId || '',
      size: context.size || 0,
      checksum: context.checksum || '',
      checksumAlgorithm: context.checksumAlgorithm || 'sha256',
      downloads: 0,
      metadata: context.metadata || {},
    });

    // Update dist tags if provided
    if (context.tags) {
      for (const [tag, version] of Object.entries(context.tags)) {
        pkg.distTags[tag] = version;
      }
    }

    // Set latest tag if not set
    if (!pkg.distTags['latest']) {
      pkg.distTags['latest'] = context.version;
    }

    await pkg.save();

    // Update organization storage usage
    const org = await Organization.findById(context.organizationId);
    if (org) {
      org.usedStorageBytes += context.size || 0;
      await org.save();
    }

    // Audit log
    await AuditService.withContext({
      actorId: context.actorId,
      actorType: context.actorId ? 'user' : 'anonymous',
      organizationId: context.organizationId,
      repositoryId: context.repositoryId,
    }).logPackagePublished(
      packageId,
      context.packageName,
      context.version,
      context.organizationId,
      context.repositoryId
    );
  }

  /**
   * Called before a package is fetched
   */
  public async beforeFetch(context: plugins.smartregistry.IFetchContext): Promise<plugins.smartregistry.IFetchContext> {
    return context;
  }

  /**
   * Called after a package is fetched
   * Update download metrics
   */
  public async afterFetch(context: plugins.smartregistry.IFetchContext): Promise<void> {
    const protocol = context.protocol as TRegistryProtocol;
    const packageId = Package.generateId(protocol, context.organizationName, context.packageName);

    const pkg = await Package.findById(packageId);
    if (pkg) {
      await pkg.incrementDownloads(context.version);
    }

    // Audit log for authenticated users
    if (context.actorId) {
      await AuditService.withContext({
        actorId: context.actorId,
        actorType: 'user',
        organizationId: context.organizationId,
        repositoryId: context.repositoryId,
      }).logPackageDownloaded(
        packageId,
        context.packageName,
        context.version || 'latest',
        context.organizationId,
        context.repositoryId
      );
    }
  }

  /**
   * Called before a package is deleted
   */
  public async beforeDelete(context: plugins.smartregistry.IDeleteContext): Promise<plugins.smartregistry.IDeleteContext> {
    return context;
  }

  /**
   * Called after a package is deleted
   */
  public async afterDelete(context: plugins.smartregistry.IDeleteContext): Promise<void> {
    const protocol = context.protocol as TRegistryProtocol;
    const packageId = Package.generateId(protocol, context.organizationName, context.packageName);

    const pkg = await Package.findById(packageId);
    if (!pkg) return;

    if (context.version) {
      // Delete specific version
      const version = pkg.versions[context.version];
      if (version) {
        const sizeReduction = version.size;
        delete pkg.versions[context.version];
        pkg.storageBytes -= sizeReduction;

        // Update dist tags
        for (const [tag, ver] of Object.entries(pkg.distTags)) {
          if (ver === context.version) {
            delete pkg.distTags[tag];
          }
        }

        // If no versions left, delete the package
        if (Object.keys(pkg.versions).length === 0) {
          await pkg.delete();
        } else {
          await pkg.save();
        }

        // Update org storage
        const org = await Organization.findById(context.organizationId);
        if (org) {
          org.usedStorageBytes -= sizeReduction;
          await org.save();
        }
      }
    } else {
      // Delete entire package
      const sizeReduction = pkg.storageBytes;
      await pkg.delete();

      // Update org storage
      const org = await Organization.findById(context.organizationId);
      if (org) {
        org.usedStorageBytes -= sizeReduction;
        await org.save();
      }
    }

    // Audit log
    await AuditService.withContext({
      actorId: context.actorId,
      actorType: context.actorId ? 'user' : 'system',
      organizationId: context.organizationId,
      repositoryId: context.repositoryId,
    }).log('PACKAGE_DELETED', 'package', {
      resourceId: packageId,
      resourceName: context.packageName,
      metadata: { version: context.version },
      success: true,
    });
  }

  /**
   * Get the S3 path for a package artifact
   */
  public getArtifactPath(
    protocol: string,
    organizationName: string,
    packageName: string,
    version: string,
    filename: string
  ): string {
    return `${this.config.basePath}/${protocol}/${organizationName}/${packageName}/${version}/${filename}`;
  }

  /**
   * Store artifact in S3
   */
  public async storeArtifact(
    path: string,
    data: Uint8Array,
    contentType?: string
  ): Promise<string> {
    const bucket = await this.config.bucket.getBucket();
    await bucket.fastPut({
      path,
      contents: Buffer.from(data),
      contentType: contentType || 'application/octet-stream',
    });
    return path;
  }

  /**
   * Fetch artifact from S3
   */
  public async fetchArtifact(path: string): Promise<Uint8Array | null> {
    try {
      const bucket = await this.config.bucket.getBucket();
      const file = await bucket.fastGet({ path });
      if (!file) return null;
      return new Uint8Array(file.contents);
    } catch {
      return null;
    }
  }

  /**
   * Delete artifact from S3
   */
  public async deleteArtifact(path: string): Promise<boolean> {
    try {
      const bucket = await this.config.bucket.getBucket();
      await bucket.fastDelete({ path });
      return true;
    } catch {
      return false;
    }
  }
}