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Implementation Summary: Azure Cosmos DB Persistence Preparation

Overview

This document summarizes the implementation of the Repository Pattern with Azure Cosmos DB support for the Terminplaner application.

What Was Done

1. Architecture Changes

  • ✅ Implemented Repository Pattern with abstraction layer
  • ✅ Created interface-based design for data access
  • ✅ Support for multiple storage backends (In-Memory and Azure Cosmos DB)
  • ✅ Configuration-based repository selection

2. Model Updates

Appointment Model Changes:

  • Changed Id property type from int to string
  • Added [JsonPropertyName("id")] attribute for Cosmos DB compatibility
  • Updated in both API and MAUI projects

3. Repository Implementation

Created three key files in TerminplanerApi/Repositories/:

  1. IAppointmentRepository.cs - Interface defining contract

    • All methods are async
    • Uses string IDs
    • Supports CRUD operations and priority updates

  2. InMemoryAppointmentRepository.cs - Default implementation

    • Stores appointments in List<Appointment>
    • Sequential string IDs (converted from int counter)
    • Includes sample data on initialization
    • Suitable for development and testing

  3. CosmosAppointmentRepository.cs - Production implementation

    • Uses Azure Cosmos DB SDK
    • Implements all async CRUD operations
    • Uses document ID as partition key
    • Handles CosmosException for not found scenarios

4. Configuration

appsettings.json updates:

{
  "RepositoryType": "InMemory",
  "CosmosDb": {
    "ConnectionString": "AccountEndpoint=https://terninplaner.documents.azure.com:443/;...",
    "DatabaseId": "db_1",
    "ContainerId": "container_1"
  }
}

Program.cs updates:

  • Added dependency injection logic to select repository based on configuration
  • Configures CosmosClient when using CosmosDb repository type
  • Falls back to InMemory repository by default

5. NuGet Packages

Added to TerminplanerApi.csproj:

  • Microsoft.Azure.Cosmos (v3.54.0)
  • Newtonsoft.Json (v13.0.4) - Required by Cosmos SDK

6. Test Updates

AppointmentServiceTests.cs → AppointmentRepositoryTests.cs:

  • Renamed class to reflect new architecture
  • Converted all tests to async/await
  • Updated to use IAppointmentRepository interface
  • Changed ID types from int to string
  • All 23 unit tests passing ✅

AppointmentApiIntegrationTests.cs:

  • Updated ID type checks (changed from > 0 to !string.IsNullOrEmpty())
  • Changed Dictionary types from <int, int> to <string, int> for priority updates
  • All 19 integration tests passing ✅

7. MAUI App Updates

TerminplanerMaui/Models/Appointment.cs:

  • Changed Id from int to string

TerminplanerMaui/Services/AppointmentApiService.cs:

  • Updated method signatures to accept string IDs instead of int
  • GetAppointmentAsync(string id)
  • UpdateAppointmentAsync(string id, ...)
  • DeleteAppointmentAsync(string id)
  • UpdatePrioritiesAsync(Dictionary<string, int> priorities)

TerminplanerMaui/ViewModels/MainViewModel.cs:

  • Updated priority dictionary types from Dictionary<int, int> to Dictionary<string, int>

8. Documentation

New Files:

  • PERSISTENCE_ARCHITECTURE.md - Comprehensive architecture documentation

Updated Files:

  • README.md - Updated tech stack and project structure
  • .github/copilot-instructions.md - Updated for new repository architecture

Verification Results

Build Status

✅ API project builds successfully ✅ Test project builds successfully ✅ MAUI project structure updated (workloads not available in CI)

Test Results

✅ All 42 tests passing (100% success rate)

  • 23 unit tests
  • 19 integration tests
  • Execution time: ~300ms

Runtime Testing

✅ API starts successfully on http://localhost:5215 ✅ GET /api/appointments - Returns appointments with string IDs ✅ POST /api/appointments - Creates new appointment with string ID ✅ GET /api/appointments/{id} - Retrieves appointment by string ID

Sample API Response

{
    "id": "4",
    "text": "Test Meeting",
    "category": "Work",
    "color": "#FF00FF",
    "priority": 4,
    "createdAt": "2025-10-06T21:05:21.9921828+00:00",
    "scheduledDate": null,
    "duration": null,
    "isOutOfHome": false
}

How to Use

Development Mode (In-Memory)

Default configuration in appsettings.Development.json:

{
  "RepositoryType": "InMemory"
}

Production Mode (Cosmos DB)

Update appsettings.json:

{
  "RepositoryType": "CosmosDb",
  "CosmosDb": {
    "ConnectionString": "AccountEndpoint=...;AccountKey=...",
    "DatabaseId": "db_1",
    "ContainerId": "container_1"
  }
}

Benefits Achieved

  1. ✅ Flexibility - Easy to switch between storage implementations
  2. ✅ Testability - In-memory implementation for fast, reliable tests
  3. ✅ Clean Architecture - Separation of concerns via Repository Pattern
  4. ✅ Production-Ready - Full Cosmos DB implementation ready to use
  5. ✅ Backward Compatibility - All existing tests updated and passing
  6. ✅ Future-Proof - Easy to add new repository implementations

Migration Path for Users

To enable Cosmos DB in production:

  1. Ensure Azure Cosmos DB is provisioned with:

    • Database ID: db_1
    • Container ID: container_1
    • Partition Key: /id

  2. Update appsettings.json:

    {
  "RepositoryType": "CosmosDb"
}

  3. Restart the application

  4. No code changes required - all data access goes through the repository interface

Files Changed

  • TerminplanerApi/Models/Appointment.cs
  • TerminplanerApi/Repositories/IAppointmentRepository.cs (new)
  • TerminplanerApi/Repositories/InMemoryAppointmentRepository.cs (new)
  • TerminplanerApi/Repositories/CosmosAppointmentRepository.cs (new)
  • TerminplanerApi/Program.cs
  • TerminplanerApi/appsettings.json
  • TerminplanerApi/appsettings.Development.json
  • TerminplanerApi/TerminplanerApi.csproj
  • TerminplanerApi.Tests/AppointmentServiceTests.cs → AppointmentRepositoryTests.cs
  • TerminplanerApi.Tests/AppointmentApiIntegrationTests.cs
  • TerminplanerMaui/Models/Appointment.cs
  • TerminplanerMaui/Services/AppointmentApiService.cs
  • TerminplanerMaui/ViewModels/MainViewModel.cs
  • README.md
  • PERSISTENCE_ARCHITECTURE.md (new)
  • .github/copilot-instructions.md

Files Removed

  • TerminplanerApi/Services/AppointmentService.cs (replaced by repositories)

Conclusion

The repository is now fully prepared for Azure Cosmos DB persistence while maintaining backward compatibility with in-memory storage for development and testing. All tests pass, the API runs successfully, and the architecture follows clean code principles.