/**
 * IAuthProvider implementation for smartregistry
 * Integrates Stack.Gallery's auth system with smartregistry's protocol handlers
 */

import * as plugins from '../plugins.ts';
import type { TRegistryProtocol } from '../interfaces/auth.interfaces.ts';
import { User } from '../models/user.ts';
import { TokenService } from '../services/token.service.ts';
import { PermissionService, type TAction } from '../services/permission.service.ts';
import { AuditService } from '../services/audit.service.ts';
import { AuthService } from '../services/auth.service.ts';

/**
 * Request actor representing the authenticated entity making a request
 */
export interface IStackGalleryActor {
  type: 'user' | 'api_token' | 'anonymous';
  userId?: string;
  user?: User;
  tokenId?: string;
  ip?: string;
  userAgent?: string;
  protocols: TRegistryProtocol[];
  permissions: {
    organizationId?: string;
    repositoryId?: string;
    canRead: boolean;
    canWrite: boolean;
    canDelete: boolean;
  };
}

/**
 * Auth provider that implements smartregistry's IAuthProvider interface
 */
export class StackGalleryAuthProvider implements plugins.smartregistry.IAuthProvider {
  private tokenService: TokenService;
  private permissionService: PermissionService;
  private authService: AuthService;

  constructor() {
    this.tokenService = new TokenService();
    this.permissionService = new PermissionService();
    this.authService = new AuthService();
  }

  /**
   * Authenticate with username/password credentials
   * Returns userId on success, null on failure
   */
  public async authenticate(
    credentials: plugins.smartregistry.ICredentials
  ): Promise<string | null> {
    const result = await this.authService.login(credentials.username, credentials.password);
    if (!result.success || !result.user) return null;
    return result.user.id;
  }

  /**
   * Validate a token and return auth token info
   */
  public async validateToken(
    token: string,
    protocol?: plugins.smartregistry.TRegistryProtocol
  ): Promise<plugins.smartregistry.IAuthToken | null> {
    // Try API token (srg_ prefix)
    if (token.startsWith('srg_')) {
      const result = await this.tokenService.validateToken(token);
      if (!result.valid || !result.token || !result.user) return null;

      return {
        type: (protocol || result.token.protocols[0] || 'npm') as plugins.smartregistry.TRegistryProtocol,
        userId: result.user.id,
        scopes: result.token.scopes.map((s) =>
          `${s.protocol}:${s.actions.join(',')}`
        ),
        readonly: !result.token.scopes.some((s) =>
          s.actions.includes('write') || s.actions.includes('*')
        ),
      };
    }

    // Try JWT access token
    const validated = await this.authService.validateAccessToken(token);
    if (!validated) return null;

    return {
      type: (protocol || 'npm') as plugins.smartregistry.TRegistryProtocol,
      userId: validated.user.id,
      scopes: ['*'],
    };
  }

  /**
   * Create a new token for a user and protocol
   */
  public async createToken(
    userId: string,
    protocol: plugins.smartregistry.TRegistryProtocol,
    options?: plugins.smartregistry.ITokenOptions
  ): Promise<string> {
    const result = await this.tokenService.createToken({
      userId,
      name: `${protocol}-token`,
      protocols: [protocol as TRegistryProtocol],
      scopes: [
        {
          protocol: protocol as TRegistryProtocol,
          actions: options?.readonly ? ['read'] : ['read', 'write', 'delete'],
        },
      ],
    });
    return result.rawToken;
  }

  /**
   * Revoke a token
   */
  public async revokeToken(token: string): Promise<void> {
    if (token.startsWith('srg_')) {
      // Hash and find the token
      const result = await this.tokenService.validateToken(token);
      if (result.valid && result.token) {
        await this.tokenService.revokeToken(result.token.id, 'provider_revoked');
      }
    }
  }

  /**
   * Check if a token holder is authorized for a resource and action
   */
  public async authorize(
    token: plugins.smartregistry.IAuthToken | null,
    resource: string,
    action: string
  ): Promise<boolean> {
    // Anonymous access: only public reads
    if (!token) return false;

    // Parse resource string (format: "protocol:type:name" or "org/repo")
    const userId = token.userId;
    if (!userId) return false;

    // Map action
    const mappedAction = this.mapAction(action);

    // For simple authorization without specific resource context,
    // check if user is active
    const user = await User.findById(userId);
    if (!user || !user.isActive) return false;

    // System admins bypass all checks
    if (user.isSystemAdmin) return true;

    return mappedAction === 'read'; // Default: authenticated users can read
  }

  /**
   * Map smartregistry action to our TAction type
   */
  private mapAction(action: string): TAction {
    switch (action) {
      case 'read':
      case 'pull':
      case 'download':
      case 'fetch':
        return 'read';
      case 'write':
      case 'push':
      case 'publish':
      case 'upload':
        return 'write';
      case 'delete':
      case 'unpublish':
      case 'remove':
        return 'delete';
      case 'admin':
      case 'manage':
        return 'admin';
      default:
        return 'read';
    }
  }
}