# Health Data & Medical Report Implementation

## Status: ✓ COMPLETED

### API Endpoints Implemented

#### 1. Health Data Endpoint
**File:** `/api/users/share-health-data.php`
**Method:** POST
**Authentication:** Required (client role)

**Request Body (JSON):**
```json
{
  "blood_pressure": "120/80",
  "heart_rate": 72,
  "sleep_hours": 7.5,
  "weight": 65.5,
  "session_notes": "Feeling better this week..."
}
```

**Response:**
```json
{
  "success": true,
  "message": "Health data saved successfully",
  "id": 123
}
```

**Features:**
- Validates all input values (ranges, types)
- Creates `health_metrics` table automatically
- Stores data with timestamps
- At least one field required
- Returns record ID on success

**Validation Rules:**
- Heart rate: 30-220 bpm
- Sleep hours: 0-24 hours
- Weight: 20-500 kg
- All fields optional except at least one required

---

#### 2. Medical Report Upload Endpoint
**File:** `/api/users/upload-medical-report.php`
**Method:** POST
**Authentication:** Required (client role)

**Request Format:** multipart/form-data
**File Input:** `report` (file)

**Accepted File Types:**
- PDF (application/pdf)
- JPG/JPEG (image/jpeg)
- PNG (image/png)
- CSV (text/csv)
- TXT (text/plain)

**File Constraints:**
- Maximum size: 10 MB
- MIME type validation enabled
- Filename sanitization

**Response:**
```json
{
  "success": true,
  "message": "Medical report uploaded successfully",
  "id": 456,
  "filename": "report_1234567890.pdf"
}
```

**Features:**
- Creates user-specific upload directories
- Generates unique filenames
- Stores metadata in database
- Validates file types and size
- Checks MIME types for security
- Logs all uploads

---

### Database Tables Created

#### `health_metrics`
```sql
CREATE TABLE IF NOT EXISTS health_metrics (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL,
    blood_pressure VARCHAR(20),
    heart_rate INT,
    sleep_hours DECIMAL(3,1),
    weight DECIMAL(5,1),
    session_notes LONGTEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    KEY (user_id, created_at)
)
```

#### `medical_reports`
```sql
CREATE TABLE IF NOT EXISTS medical_reports (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL,
    filename VARCHAR(255) NOT NULL,
    original_filename VARCHAR(255) NOT NULL,
    file_path VARCHAR(512) NOT NULL,
    file_size INT NOT NULL,
    mime_type VARCHAR(100),
    uploaded_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    KEY (user_id, uploaded_at)
)
```

---

### Front-End Integration (Dashboard)

**File:** `/dashboard/user/index.php`

#### Health Data Form
- Located in "Health Data & Session Notes" section
- Captures: blood pressure, heart rate, sleep hours, weight, session notes
- Submits via fetch POST to `/api/users/share-health-data.php`
- Shows success/error status messages

#### Medical Report Form
- Located in "Upload Medical Report" section
- File input with accepted formats
- Submits via fetch POST (multipart/form-data)
- Shows upload progress and status

**Event Handlers:**
```javascript
// Health Data Form - Line 408-432
document.getElementById('healthDataForm')?.addEventListener('submit', async (e) => { ... })

// Medical Report Upload - Line 434-459
document.getElementById('medicalReportForm')?.addEventListener('submit', async (e) => { ... })
```

---

### Security Features

✓ Authentication required for both endpoints
✓ Input validation for all health metrics
✓ MIME type validation for file uploads
✓ File size limits (10 MB max)
✓ Unique filename generation
✓ User-specific upload directories
✓ SQL prepared statements
✓ Proper error handling and logging
✓ Credentials required for fetch requests

---

### Upload Directory Structure

```
/uploads/medical-reports/
  ├── {user_id}/
  │   ├── report_xxxxx.pdf
  │   ├── report_xxxxx.jpg
  │   └── report_xxxxx.csv
```

---

### Error Handling

**Health Data Endpoint:**
- 405: Method not allowed
- 400: Invalid input/validation error
- 401: Unauthorized
- 500: Database/server error

**Medical Report Endpoint:**
- 405: Method not allowed
- 400: Invalid file type or no file
- 401: Unauthorized
- 413: File exceeds size limit
- 500: Upload/database error

---

### Testing

Forms are fully functional in the user dashboard at:
`/dashboard/user/index.php`

Both forms:
1. Validate input on client side
2. Submit to respective API endpoints
3. Display success/error messages
4. Clear form on successful submission
5. Data is persisted in database

---

### Next Steps (Optional)

1. Add endpoint to retrieve user's health history
2. Create coach dashboard to view patient health data
3. Add chart/graph visualization for health trends
4. Implement file download/deletion for reports
5. Add compliance features (HIPAA, GDPR)
6. Export health data as PDF

