englisch

2026-04-17 07:08:04 +02:00
parent ca91af9682
commit 0d3bd47f7a
34 changed files with 17503 additions and 160 deletions
@@ -0,0 +1,93 @@
+using System.Globalization;
+using System.Xml.Linq;
+using Microsoft.EntityFrameworkCore;
+using TrafagSalesExporter.Data;
+using TrafagSalesExporter.Models;
+
+namespace TrafagSalesExporter.Services;
+
+public class ExchangeRateImportService : IExchangeRateImportService
+{
+    private const string EcbXmlUrl = "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml";
+    private const string EcbSourceNote = "ECB daily reference rate";
+
+    private readonly IHttpClientFactory _httpClientFactory;
+    private readonly IDbContextFactory<AppDbContext> _dbFactory;
+
+    public ExchangeRateImportService(IHttpClientFactory httpClientFactory, IDbContextFactory<AppDbContext> dbFactory)
+    {
+        _httpClientFactory = httpClientFactory;
+        _dbFactory = dbFactory;
+    }
+
+    public async Task<ExchangeRateImportResult> RefreshEcbRatesAsync(CancellationToken cancellationToken = default)
+    {
+        var client = _httpClientFactory.CreateClient(nameof(ExchangeRateImportService));
+        using var response = await client.GetAsync(EcbXmlUrl, cancellationToken);
+        response.EnsureSuccessStatusCode();
+
+        var xml = await response.Content.ReadAsStringAsync(cancellationToken);
+        var document = XDocument.Parse(xml);
+
+        var rateEntries = ParseRates(document);
+        if (rateEntries.Count == 0)
+            throw new InvalidOperationException("ECB response did not contain any exchange rates.");
+
+        var rateDate = rateEntries[0].RateDate;
+
+        using var db = await _dbFactory.CreateDbContextAsync(cancellationToken);
+        var existingRates = await db.CurrencyExchangeRates
+            .Where(x => x.Notes == EcbSourceNote && x.ValidFrom == rateDate)
+            .ToListAsync(cancellationToken);
+
+        if (existingRates.Count > 0)
+            db.CurrencyExchangeRates.RemoveRange(existingRates);
+
+        db.CurrencyExchangeRates.AddRange(rateEntries.Select(entry => new CurrencyExchangeRate
+        {
+            FromCurrency = "EUR",
+            ToCurrency = entry.Currency,
+            Rate = entry.Rate,
+            ValidFrom = entry.RateDate,
+            ValidTo = null,
+            Notes = EcbSourceNote,
+            IsActive = true
+        }));
+
+        await db.SaveChangesAsync(cancellationToken);
+
+        return new ExchangeRateImportResult
+        {
+            ImportedCount = rateEntries.Count,
+            RateDate = rateDate,
+            SourceName = "ECB"
+        };
+    }
+
+    private static List<EcbRateEntry> ParseRates(XDocument document)
+    {
+        var cubes = document
+            .Descendants()
+            .Where(x => x.Name.LocalName == "Cube")
+            .ToList();
+
+        var datedCube = cubes.FirstOrDefault(x => x.Attribute("time") is not null)
+            ?? throw new InvalidOperationException("ECB response did not contain a dated rate section.");
+
+        var dateText = datedCube.Attribute("time")?.Value
+            ?? throw new InvalidOperationException("ECB rate date is missing.");
+
+        var rateDate = DateTime.ParseExact(dateText, "yyyy-MM-dd", CultureInfo.InvariantCulture);
+
+        return datedCube.Elements()
+            .Where(x => x.Name.LocalName == "Cube")
+            .Select(x => new EcbRateEntry(
+                Currency: (x.Attribute("currency")?.Value ?? string.Empty).Trim().ToUpperInvariant(),
+                Rate: decimal.Parse(x.Attribute("rate")?.Value ?? "0", CultureInfo.InvariantCulture),
+                RateDate: rateDate))
+            .Where(x => !string.IsNullOrWhiteSpace(x.Currency) && x.Rate > 0m)
+            .ToList();
+    }
+
+    private sealed record EcbRateEntry(string Currency, decimal Rate, DateTime RateDate);
+}