# 📋 CONSTITUTION - care-api

**Project**: KiviCare REST API WordPress Plugin  
**Domain**: Healthcare Management System Integration  
**Created**: 2025-09-12  

## 🎯 Project Mission

Develop a comprehensive REST API WordPress plugin that provides secure, authenticated access to all KiviCare healthcare management system functionalities, enabling seamless third-party integrations and custom applications.

## 🔧 Technical Principles

### Architecture
- **WordPress Plugin Pattern**: Native WordPress plugin with hooks/filters
- **REST API First**: All functionality exposed via REST endpoints
- **Security by Design**: JWT authentication, input validation, prepared statements
- **Test-Driven Development**: Comprehensive unit, integration, and contract tests

### Code Standards
- **WordPress Coding Standards (WPCS)**: Mandatory adherence
- **PSR-4 Autoloading**: Modern PHP class loading
- **Documentation**: PHPDoc comments for all public methods
- **Security**: Never trust user input, sanitize everything

### Data Layer
- **KiviCare Schema**: Work with existing 35-table structure
- **WordPress Database API**: Use $wpdb for all database operations
- **Prepared Statements**: Prevent SQL injection vulnerabilities
- **Data Validation**: Strict input/output validation

## 🏥 Domain Expertise

### Healthcare Context
- **Patient Management**: Demographics, medical history, privacy (HIPAA considerations)
- **Appointment Scheduling**: Complex scheduling rules, conflicts, notifications
- **Clinical Documentation**: Encounters, prescriptions, medical records
- **Billing Integration**: Services, bills, insurance claims

### KiviCare Entities
```
Core: Patients, Doctors, Appointments, Clinics
Clinical: Encounters, Prescriptions, Services, Bills
System: Users, Roles, Settings, Logs
```

## 🔒 Security Requirements

### Authentication
- **JWT Tokens**: Secure, stateless authentication
- **Refresh Tokens**: Long-lived session management
- **Role-based Access**: Different permissions per user type
- **API Rate Limiting**: Prevent abuse and DoS attacks

### Data Protection
- **Input Sanitization**: All user inputs cleaned
- **Output Encoding**: Prevent XSS attacks
- **SQL Injection Prevention**: Only prepared statements
- **Audit Logging**: Track all data access/modifications

## 🧪 Quality Assurance

### Testing Strategy
- **Unit Tests**: 80%+ code coverage minimum
- **Integration Tests**: Database operations, WordPress integration
- **Contract Tests**: API endpoint validation
- **Security Tests**: Authentication, authorization, input validation

### Performance Standards
- **Response Times**: < 200ms for 95% of requests
- **Memory Usage**: Efficient resource management
- **Database Queries**: Optimized, indexed queries only
- **Caching Strategy**: Implement where appropriate

## 📐 API Design Principles

### RESTful Design
- **Resource-based URLs**: `/patients/{id}`, `/appointments/{id}`
- **HTTP Methods**: GET, POST, PUT, DELETE semantic usage
- **Status Codes**: Proper HTTP response codes
- **Consistent Naming**: kebab-case for URLs, camelCase for JSON

### Response Format
```json
{
  "success": true,
  "data": {},
  "message": "Operation completed",
  "meta": {
    "timestamp": "ISO8601",
    "version": "1.0.0"
  }
}
```

## 🚀 Deployment Principles

### WordPress Integration
- **Plugin Activation**: Proper setup/teardown hooks
- **Database Migrations**: Version-controlled schema changes
- **WordPress Updates**: Compatibility testing required
- **Multisite Support**: Consider network installations

### Production Readiness
- **Error Handling**: Graceful failure modes
- **Logging**: Structured logs for monitoring
- **Configuration**: Environment-based settings
- **Backup Strategy**: Data protection procedures

---

**Constitution Version**: 1.0  
**Last Updated**: 2025-09-12  
**Next Review**: Major feature additions