Add Dolibarr workflow integration for automated VAT processing

Dolibarr Hook System Integration:
- Hook into invoice validation and accounting transfer events
- Automatic EU supplier detection and autoliquidation
- Custom fields for VAT processing (EU flag, transaction type)
- Batch processing for multiple invoices
- Workflow triggers for status changes

Available Hooks:
- supplier_invoice_validate: Auto-detect EU suppliers
- supplier_invoice_accountancy_transfer: Create VAT entries
- invoice_validate: Apply EU transaction rules
- invoice_accountancy_transfer: Generate accounting entries

Automation Workflow:
1. User creates EU supplier invoice
2. Hook triggers on validation
3. Auto-detect EU supplier
4. Create VAT due (4452xxx) and deductible (4456xx) entries
5. Entries ready for CA-3 calculations

Custom Fields:
- EU Supplier Flag
- VAT Treatment (autoliquidation vs normal)
- Transaction Type (B2B, B2C, special cases)
- OSS Threshold tracking
- DEB/DES requirement flags

Enhanced Features:
- Automatic VAT processing
- Reduced manual work for EU transactions
- Seamless integration with Dolibarr workflow
- Custom field management
- Batch processing capabilities

Updated estimates: +44 hours for workflow integration
Total project: 456+ hours with full Dolibarr integration

PLANNING.md

@@ -123,6 +123,44 @@ The module handles the complete French CA-3 VAT declaration structure:
 19. **Integration APIs**: Connect with external tax systems
 20. **Mobile Support**: Responsive design for mobile access
 
+### Dolibarr Workflow Integration
+21. **Autoliquidation Automation**: Automatic EU VAT autoliquidation on invoice transfer
+22. **Hook System Integration**: Extend Dolibarr core functionality
+23. **Invoice Processing Hooks**: Intercept invoice accounting transfers
+24. **Supplier Invoice Automation**: Auto-detect EU suppliers and apply autoliquidation
+25. **Customer Invoice Automation**: Auto-apply EU transaction rules
+26. **Accounting Entry Automation**: Generate VAT entries during transfer to accounting
+27. **Workflow Triggers**: Automatic VAT processing based on invoice status
+28. **Custom Fields Integration**: Extend invoices with VAT-specific fields
+29. **Status Change Automation**: Trigger VAT processing on invoice validation
+30. **Batch Processing**: Handle multiple invoices for VAT processing
+
+### Dolibarr Hook Integration
+
+#### Available Hooks for VAT Automation
+- **`invoice_validate`**: Trigger when invoice is validated
+- **`invoice_accountancy_transfer`**: Trigger when invoice is transferred to accounting
+- **`supplier_invoice_validate`**: Trigger when supplier invoice is validated
+- **`supplier_invoice_accountancy_transfer`**: Trigger when supplier invoice is transferred
+- **`invoice_paid`**: Trigger when invoice is marked as paid
+- **`invoice_unpaid`**: Trigger when invoice is marked as unpaid
+- **`invoice_cancel`**: Trigger when invoice is cancelled
+
+#### Automation Workflow
+1. **Invoice Creation**: User creates supplier invoice from EU supplier
+2. **Hook Trigger**: `supplier_invoice_validate` hook fires
+3. **EU Detection**: Module checks if supplier is EU-based
+4. **Autoliquidation**: Automatically creates VAT due (4452xxx) and VAT deductible (4456xx) entries
+5. **Accounting Transfer**: When transferred to accounting, entries are already created
+6. **CA-3 Integration**: Entries automatically appear in CA-3 calculations
+
+#### Custom Fields for VAT Processing
+- **EU Supplier Flag**: Mark suppliers as EU-based
+- **VAT Treatment**: Specify autoliquidation vs normal VAT
+- **Transaction Type**: B2B, B2C, special cases
+- **OSS Threshold**: Track B2C sales thresholds
+- **DEB/DES Required**: Flag invoices requiring exchange declarations
+
 ### File Structure
 ```
 declarationtva/
@@ -131,10 +169,13 @@ declarationtva/
 │   └── about.php
 ├── core/
 │   ├── modules/modDeclarationTVA.class.php
-│   └── class/
-│       ├── declarationtva.class.php
-│       ├── declarationtva_config.class.php
-│       └── declarationtva_period.class.php
+│   ├── class/
+│   │   ├── declarationtva.class.php
+│   │   ├── declarationtva_config.class.php
+│   │   └── declarationtva_period.class.php
+│   └── triggers/
+│       ├── interface_99_modDeclarationTVA_DeclarationTVATrigger.class.php
+│       └── action_99_modDeclarationTVA_DeclarationTVAAction.class.php
 ├── lib/
 │   └── declarationtva.lib.php
 ├── langs/

TASK.md

@@ -449,6 +449,42 @@
   - **Estimated**: 6 hours
   - **Dependencies**: Task 7.6.1
 
+### 7.7 Dolibarr Workflow Integration
+- [ ] **Task 7.7.1**: Create Dolibarr hook system
+  - File: `core/triggers/interface_99_modDeclarationTVA_DeclarationTVATrigger.class.php`
+  - Implement hook interface
+  - Register hooks for invoice processing
+  - **Estimated**: 8 hours
+  - **Dependencies**: Task 1.2.1
+
+- [ ] **Task 7.7.2**: Implement autoliquidation automation
+  - Hook into `supplier_invoice_validate`
+  - Auto-detect EU suppliers
+  - Create VAT due and deductible entries
+  - **Estimated**: 12 hours
+  - **Dependencies**: Task 7.7.1
+
+- [ ] **Task 7.7.3**: Add EU transaction automation
+  - Hook into `invoice_validate` for customer invoices
+  - Auto-apply EU transaction rules
+  - Handle B2B vs B2C scenarios
+  - **Estimated**: 10 hours
+  - **Dependencies**: Task 7.7.2
+
+- [ ] **Task 7.7.4**: Create custom fields for VAT processing
+  - EU supplier flag
+  - VAT treatment selection
+  - Transaction type classification
+  - **Estimated**: 6 hours
+  - **Dependencies**: Task 7.7.1
+
+- [ ] **Task 7.7.5**: Implement batch processing
+  - Handle multiple invoices
+  - Bulk VAT processing
+  - Progress tracking
+  - **Estimated**: 8 hours
+  - **Dependencies**: Task 7.7.3
+
 ## Discovered During Work
 
 *Tasks discovered during development will be added here*
@@ -464,7 +500,7 @@
 - Performance optimization for large datasets
 - Security considerations for financial data
 
-## Total Estimated Time: 414+ hours
+## Total Estimated Time: 456+ hours
 
 ### Breakdown by Phase:
 - **Phase 1-2**: Foundation & Configuration (40 hours)
@@ -473,7 +509,8 @@
 - **Phase 5**: Export & Reporting (25 hours)
 - **Phase 6**: Testing & Documentation (25 hours)
 - **Phase 7**: Advanced Features (80 hours)
-- **Buffer & Integration**: 127 hours
+- **Phase 8**: Dolibarr Workflow Integration (44 hours)
+- **Buffer & Integration**: 125 hours
 
 ## Priority Order:
 1. Database schema and core classes

langs/en_US/declarationtva.lang

@@ -243,3 +243,27 @@ DeclarationTVAResponsiveDesign = Responsive Design
 DeclarationTVATouchFriendly = Touch-Friendly
 DeclarationTVAAccessibility = Accessibility
 DeclarationTVAKeyboardShortcuts = Keyboard Shortcuts
+
+# Dolibarr Workflow Integration
+DeclarationTVAWorkflowIntegration = Dolibarr Workflow Integration
+DeclarationTVAAutoliquidationAutomation = Autoliquidation Automation
+DeclarationTVAHookSystem = Hook System
+DeclarationTVAInvoiceProcessingHooks = Invoice Processing Hooks
+DeclarationTVASupplierInvoiceAutomation = Supplier Invoice Automation
+DeclarationTVACustomerInvoiceAutomation = Customer Invoice Automation
+DeclarationTVAAccountingEntryAutomation = Accounting Entry Automation
+DeclarationTVAWorkflowTriggers = Workflow Triggers
+DeclarationTVACustomFieldsIntegration = Custom Fields Integration
+DeclarationTVAStatusChangeAutomation = Status Change Automation
+DeclarationTVABatchProcessing = Batch Processing
+
+# Custom Fields
+DeclarationTVAEUSupplierFlag = EU Supplier Flag
+DeclarationTVAVATTreatment = VAT Treatment
+DeclarationTVATransactionType = Transaction Type
+DeclarationTVAOSSThreshold = OSS Threshold
+DeclarationTVADEBDESRequired = DEB/DES Required
+DeclarationTVAAutoliquidationFlag = Autoliquidation Flag
+DeclarationTVAB2BTransaction = B2B Transaction
+DeclarationTVAB2CTransaction = B2C Transaction
+DeclarationTVASpecialCase = Special Case

langs/fr_FR/declarationtva.lang

@@ -232,3 +232,27 @@ DeclarationTVAResponsiveDesign = Design responsive
 DeclarationTVATouchFriendly = Interface tactile
 DeclarationTVAAccessibility = Accessibilité
 DeclarationTVAKeyboardShortcuts = Raccourcis clavier
+
+# Intégration workflow Dolibarr
+DeclarationTVAWorkflowIntegration = Intégration workflow Dolibarr
+DeclarationTVAAutoliquidationAutomation = Automatisation autoliquidation
+DeclarationTVAHookSystem = Système de hooks
+DeclarationTVAInvoiceProcessingHooks = Hooks de traitement des factures
+DeclarationTVASupplierInvoiceAutomation = Automatisation factures fournisseurs
+DeclarationTVACustomerInvoiceAutomation = Automatisation factures clients
+DeclarationTVAAccountingEntryAutomation = Automatisation écritures comptables
+DeclarationTVAWorkflowTriggers = Déclencheurs workflow
+DeclarationTVACustomFieldsIntegration = Intégration champs personnalisés
+DeclarationTVAStatusChangeAutomation = Automatisation changement de statut
+DeclarationTVABatchProcessing = Traitement par lots
+
+# Champs personnalisés
+DeclarationTVAEUSupplierFlag = Drapeau fournisseur UE
+DeclarationTVAVATTreatment = Traitement TVA
+DeclarationTVATransactionType = Type de transaction
+DeclarationTVAOSSThreshold = Seuil OSS
+DeclarationTVADEBDESRequired = DEB/DES requis
+DeclarationTVAAutoliquidationFlag = Drapeau autoliquidation
+DeclarationTVAB2BTransaction = Transaction B2B
+DeclarationTVAB2CTransaction = Transaction B2C
+DeclarationTVASpecialCase = Cas spécial