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Filip - Mews backend developer task (.NET) #793

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0d313bb
Initial commit. Refactored according to DDD but as separate projects …
filipworksdev Nov 17, 2025
49b3d31
Added api with controller and swagger and basic client to test out th…
filipworksdev Nov 17, 2025
64bee59
Fix copilot comments. Moved the parser logic to an internal helper an…
filipworksdev Nov 18, 2025
5d8e9f7
Small fix missing the namespace change from Controller to Models
filipworksdev Nov 18, 2025
58b8403
Added docs section and a README.MD
filipworksdev Nov 25, 2025
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2 changes: 2 additions & 0 deletions .gitignore
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*.tgz
*.sublime-*

.vs/

node_modules
bower_components
npm-debug.log
19 changes: 0 additions & 19 deletions jobs/Backend/Task/ExchangeRateProvider.cs
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8 changes: 0 additions & 8 deletions jobs/Backend/Task/ExchangeRateUpdater.csproj
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146 changes: 124 additions & 22 deletions jobs/Backend/Task/ExchangeRateUpdater.sln
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43 changes: 0 additions & 43 deletions jobs/Backend/Task/Program.cs
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92 changes: 92 additions & 0 deletions jobs/Backend/Task/README.MD
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# Exchange Rate Provider

This project implements a .NET solution for managing and retrieving echange rates from the Czech Natinal Bank.

# Source for updating daily rates

The daily rates are found at this location:
https://www.cnb.cz/en/financial-markets/foreign-exchange-market/central-bank-exchange-rate-fixing/central-bank-exchange-rate-fixing/index.html?date=14.11.2025

And can be accessed directly as a csv plain text file at this location:
https://www.cnb.cz/en/financial-markets/foreign-exchange-market/central-bank-exchange-rate-fixing/central-bank-exchange-rate-fixing/daily.txt

There is also an official official .NET library but is outdated so I went ahead and implemented my own provider with similar idea using csv parsing to split and extract the rates from the csv plain text file.
https://github.com/msigut/CNB.Exchange/tree/master

# Structure
Split the solution into 5+1 different projects to keep it more organized

src/
- **ExchangeRateUpdater.Api** - Presentation/Application API Layer
- **ExchangeRateUpdate.Client** - This is the test client that uses the API
**ExchangeRateUpdate.Console** - Console only test of the solution
- **ExchangeRateUpdate.BusinessLogic** - Domain Layer
- **ExchangeRateUpdate.Data** - Infrastructure Layer

test/
- **ExchangeRateUpdate.UniTests** - Unit tests

here is also where integration tests would be added eventually

## Core Models

### `ExchangeRate`
Represents a currency exchange rate with:
- `SourceCurrency`: The currency being converted from
- `TargetCurrency`: The currency being converted to
- `Value`: The exchange rate value

### `Currency`
Represents a currency with its code (e.g., USD, EUR)

## Getting Started

### Prerequisites

- .NET 7.0 or higher
- Visual Studio 2022 or Visual Studio Code

### Observations

#### API Configuration

The API is set to run at `https://localhost:5001` (or as configured in `appsettings.json` and `launchSettings.json`) and has one single GET endpoint

It also opens a swagger page at `https://localhost:5001/swagger/index.html` for easy testing and exploration of the API.

#### Client Configuration

Currently it doesn't have a setting where to look for the external service in appsettings.json but instead it expecting the API endpoint to be located at localhost:5001 in the javascript. Thus should be changed in the future so that it can be configured from appsettings.json.

## Architecture

The solution follows a layered architecture:

```
┌─────────────────────────────────────┐
│ Presentation Layer │
│ (Console, API, Client) │
└──────────────┬──────────────────────┘
│
┌──────────────▼──────────────────────┐
│ Business Logic Layer │
│ (ExchangeRateManager, Services) │
└──────────────┬──────────────────────┘
│
┌──────────────▼──────────────────────┐
│ Data Access Layer │
│ (Repositories, Database, Data) │
└─────────────────────────────────────┘
```

## License

This is a Mews developer challenge project.

## Contributing

When contributing to this solution:
1. Ensure all unit tests pass
2. Follow C# coding standards
3. Add tests for new functionality
4. Update documentation as needed
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