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# BASIS core

This project, **BASIS Core**, is a modular, multi-tenant enterprise platform built with PHP. It implements a robust PSR-7/PSR-15 compliant architecture with advanced security features and modern frontend integration via Hotwire Turbo. 

Based on the provided UML sequence diagram and codebase, here is a structured introduction to the project:

### 1. HTTP Request Pipeline & Middleware Stack
The application uses a layered middleware pipeline to process requests securely before they reach the business logic:
*   **Entry Point & Kernel**: Requests enter via `public/index.php` and are dispatched by the `Http\Kernel` (`core/Http/Kernel.php`).
*   **Tenant Resolution**: `TenantResolutionMiddleware` (`src/Http/Middleware/TenantResolutionMiddleware.php`) resolves the current tenant from the request host and switches the database connection context accordingly.
*   **RLS Session Context**: `DbSessionMiddleware` (`core/Http/Middleware/DbSessionMiddleware.php`) sets PostgreSQL session variables (like `app.current_user_id`) to enforce Row-Level Security (RLS) policies at the database level.
*   **Security Middlewares**: `CsrfMiddleware` validates CSRF tokens, and `RateLimiterMiddleware` prevents brute-force attacks.
*   **Turbo Detection**: `TurboStreamDetector` (`core/Http/TurboStreamDetector.php`) identifies if the request originates from Hotwire Turbo, allowing the controller to return `TurboStreamResponse` instead of full HTML.

### 2. Advanced Authentication & Security Flow
The platform implements a sophisticated, multi-layered authentication system:
*   **Core Authentication**: `AuthService` (`core/Auth/AuthService.php`) handles credential verification and session creation via `SessionManager`.
*   **Multi-Factor Authentication (MFA)**: If enabled, `MfaService` (`core/Auth/MfaService.php`) enforces a TOTP challenge. Users can verify via authenticator apps or backup codes.
*   **WebAuthn/Biometrics**: As an alternative MFA factor, `WebAuthnService` (`core/Auth/WebAuthn/WebAuthnService.php`) handles biometric authentication (FaceID, fingerprint) and hardware security keys.
*   **User Context**: Upon successful login, `UserProfileAgent` (`core/Agents/UserProfileAgent.php`) initializes the user's profile, permissions, and runtime context.

### 3. Modern Frontend Integration (Hotwire Turbo)
Instead of building a heavy SPA, the project uses **Hotwire Turbo** for a fast, modern UX:
*   The `TurboStreamDetector` intercepts responses from the `App Controller`.
*   If the client expects a Turbo Stream, the system formats a `TurboStreamResponse` (`core/Http/Response/TurboStreamResponse.php`), sending only the modified DOM fragments to the browser.
*   This allows seamless, SPA-like navigation without writing custom JavaScript, while keeping the server as the source of truth.

### 4. Modular & Multi-Tenant Architecture
The project is structured as a monorepo containing distinct "apps" and "modules":
*   **Multi-App Support**: It hosts multiple business applications like **Operand** (ERP), **Nexus** (BI/Strategy), **Axis** (Field Operations), and **Vector** (Engineering). Each app has its own controllers, views, and routing (`apps/operand`, `apps/nexus`, etc.).
*   **Core Modules**: Shared functionalities are abstracted into modules like `core-auth` (Authentication), `core-admin` (Administration), `audit`, and `files` (`modules/`).
*   **Database Isolation**: The `db_auth` schema centralizes user identities, while `TenantResolutionMiddleware` ensures data isolation per company using database-level RLS.