# Phase 2 Week 5: Translation Workflow System - IN PROGRESS

**Date:** 2026-02-07  
**Status:** 40% Complete  
**Time Investment:** 1 hour

---

## ✅ Completed Deliverables

### 1. Workflow State Enum ✅
**File:** `includes/Workflow/WorkflowState.php` (143 lines)

**Features:**
- 8 workflow states (draft, in_review, approved, in_translation, translation_complete, published, rejected, archived)
- State validation (`isValid()`)
- Human-readable labels with i18n (`getLabel()`)
- UI helpers: colors and icons (`getColor()`, `getIcon()`)
- WordPress.org compliant (ABSPATH, text domain, proper escaping)

### 2. Database Tables ✅
**Modified:** `includes/Core/Database.php` (+120 lines)

**Created Tables:**
- ✅ `wp_mpz_workflow_states` - Current workflow state tracking
  - Columns: id, translation_id, state, previous_state, assigned_to, assigned_by, deadline, started_at, completed_at, notes, metadata, timestamps
  - Indexes: translation (UNIQUE), state, assigned_to, assigned_by, deadline, created_at
  
- ✅ `wp_mpz_workflow_history` - Complete audit trail
  - Columns: id, translation_id, from_state, to_state, changed_by, change_reason, time_in_state, metadata, created_at
  - Indexes: translation_history (composite), changed_by, to_state, created_at
  
- ✅ `wp_mpz_translator_capacity` - Translator management
  - Columns: user_id (PK), max_concurrent, current_assigned, language_pairs (JSON), availability_schedule (JSON), is_active, timestamps
  - Indexes: active, capacity (composite)

**Verification:**
```bash
✅ Table exists: wp_mpz_workflow_states
✅ Table exists: wp_mpz_workflow_history
✅ Table exists: wp_mpz_translator_capacity
```

### 3. StateMachine Class ✅ (Pre-existing)
**File:** `includes/Workflow/StateMachine.php` (604 lines)

**Features:**
- State transition management with validation
- Permission-based transitions using WordPress capabilities
- Complete audit logging
- WordPress hooks integration
- Transaction support for data integrity
- Bulk transition support
- State history timeline
- Statistics reporting

**Notable Methods:**
- `transition()` - Perform state transition with validation
- `canTransition()` - Check if transition is allowed
- `getAvailableTransitions()` - Get valid next states
- `getStateHistory()` - Retrieve complete audit trail
- `initializeState()` - Initialize new translations
- `bulkTransition()` - Batch state changes

---

## 🚧 Remaining Work (60%)

### Task 5.2: Email Notification System

#### NotificationManager Class
**File:** `includes/Workflow/NotificationManager.php` (NOT STARTED)

**Required Features:**
- Email coordinator for all workflow notifications
- Integration with WordPress `wp_mail()`
- Template rendering system
- Queue management for bulk emails
- Notification preferences per user
- Delivery tracking

#### Email Template Engine
**File:** `includes/Workflow/EmailTemplates/TemplateEngine.php` (NOT STARTED)

**Required Features:**
- Variable replacement (`{{variable}}`)
- Conditionals (`{{#if condition}}...{{/if}}`)
- Loops (`{{#each items}}...{{/each}}`)
- XSS protection
- HTML + text versions
- Base layout with header/footer

#### Email Templates
**Directory:** `templates/emails/workflow/` (NOT STARTED)

**Templates to Create:**
1. `assigned.php` / `assigned.txt` - Assignment notification
2. `deadline-reminder.php` / `deadline-reminder.txt` - Deadline warnings
3. `deadline-passed.php` / `deadline-passed.txt` - Overdue alerts
4. `review-request.php` / `review-request.txt` - Review requests
5. `approved.php` / `approved.txt` - Approval notifications
6. `rejected.php` / `rejected.txt` - Rejection notifications
7. `published.php` / `published.txt` - Publication confirmations

### Task 5.3: Assignment Engine

#### AssignmentEngine Class
**File:** `includes/Workflow/AssignmentEngine.php` (NOT STARTED)

**Required Features:**
- Auto-assignment algorithm with load balancing
- Skill-based matching (language pairs)
- Availability checking
- Priority queue handling
- Round-robin fallback
- Workload calculation

**Methods Needed:**
- `autoAssign()` - Intelligent auto-assignment
- `getTranslatorWorkload()` - Calculate current load
- `getAvailableTranslators()` - Find eligible translators
- `calculatePriority()` - Determine urgency

---

## 📊 Progress Metrics

### Code Stats:
- **Lines Added:** ~263 lines (WorkflowState + Database tables)
- **Lines Pre-existing:** 604 lines (StateMachine)
- **Total Workflow Code:** 867 lines
- **Database Tables:** 3 created
- **Test Coverage:** 0% (tests pending)

### Completion Breakdown:
- ✅ **Workflow States:** 100%
- ✅ **Database Schema:** 100%
- ✅ **State Machine:** 100% (pre-existing)
- ❌ **Email Notifications:** 0%
- ❌ **Assignment Engine:** 0%
- ❌ **Unit Tests:** 0%
- ❌ **E2E Tests:** 0%

---

## 🎯 Next Actions (Priority Order)

### 1. NotificationManager Implementation (2-3 hours)
- Create `NotificationManager` class
- Build template engine
- Create base email layout
- Implement 7 email templates
- Add WordPress hooks integration

### 2. Assignment Engine Implementation (2 hours)
- Create `AssignmentEngine` class
- Implement load balancing algorithm
- Add skill matching logic
- Create availability checks
- Integrate with translator_capacity table

### 3. Testing (1-2 hours)
- Unit tests for WorkflowState
- Unit tests for StateMachine transitions
- Unit tests for AssignmentEngine
- E2E tests for full workflow
- Test email delivery

### 4. Documentation (30 min)
- API documentation for workflow classes
- Usage examples
- Hook reference for developers
- Email template customization guide

---

## 🔧 Technical Decisions Made

### 1. State Model
- **Choice:** 8-state workflow (extended from existing 6-state)
- **Rationale:** Better granularity for enterprise workflows
- **States:** draft → in_review → approved → in_translation → translation_complete → published
- **Alternative paths:** rejected, archived

### 2. Database Schema
- **Choice:** Separate `workflow_states` and `workflow_history` tables
- **Rationale:** 
  - `workflow_states`: Current state (1 row per translation, fast lookups)
  - `workflow_history`: Complete audit trail (append-only, compliance)
- **Benefits:** Performance + compliance + history preservation

### 3. JSON Metadata Fields
- **Choice:** JSON columns for `metadata`, `language_pairs`, `availability_schedule`
- **Rationale:** Flexibility without schema migrations
- **Trade-off:** Slightly harder to query, but MySQL 5.7+ has JSON functions

### 4. Permission Model
- **Choice:** WordPress capabilities-based permissions
- **Rationale:** Integrates with existing WP roles/caps system
- **Capabilities:** `submit_translation`, `review_translation`, `translate_content`, `publish_translation`

---

## 🐛 Known Issues

1. **StateMachine Inconsistency**
   - Existing StateMachine uses `Translation` entity objects
   - New WorkflowState uses string-based state constants
   - **Resolution needed:** Align on single approach (likely use int IDs + state strings)

2. **Missing Model Classes**
   - `Translation` entity class referenced but implementation not verified
   - **Action:** Verify/create entity classes

3. **Hook Integration**
   - Workflow hooks defined but no listeners yet
   - **Action:** Create NotificationManager to listen to workflow hooks

---

## 📝 WordPress.org Compliance Checklist

All code follows expert.md guidelines:

- [x] ABSPATH check in all files
- [x] Proper namespace (`MultilingualPressZone\Workflow`)
- [x] Text domain: `'multilingual-press-zone'`
- [x] `declare(strict_types=1)`
- [x] No inline CSS
- [x] Input sanitization (`sanitize_text_field`)
- [x] Output escaping (`esc_html__`)
- [x] Prepared SQL statements (`$wpdb->prepare()`)
- [x] WordPress hooks (`do_action`, `apply_filters`)
- [x] Proper error handling
- [ ] Unit tests (pending)
- [ ] E2E tests (pending)

---

## ⏱️ Time Estimate to Complete

- **Email System:** 2-3 hours
- **Assignment Engine:** 2 hours
- **Testing:** 1-2 hours
- **Documentation:** 30 min

**Total Remaining:** 5.5-7.5 hours
**Overall Phase 2 Week 5:** 6.5-8.5 hours total

---

**Status:** Phase 2 Week 5 is 40% complete. Foundation is solid. Ready to proceed with email notifications and assignment engine.

**Next Session Goal:** Complete NotificationManager + assignment email templates (2-3 hour session)