From 80b74d1dedb8c3d69bea938ca1d2630320e480cf Mon Sep 17 00:00:00 2001
From: Trond Schertel <t.schertel@t-m-g.de>
Date: Fri, 29 May 2026 16:10:20 +0200
Subject: [PATCH] Excel-Import

---
 Components/Pages/Home.razor            |   4 +-
 Components/Pages/WorkspaceDetail.razor | 114 +++++++++++++++++++++++++
 Services/WorkspaceService.cs           |  41 +++++++++
 ZahlenAnalyse.Web.csproj               |   2 +
 4 files changed, 160 insertions(+), 1 deletion(-)
 create mode 100644 Components/Pages/WorkspaceDetail.razor

diff --git a/Components/Pages/Home.razor b/Components/Pages/Home.razor
index 6b633c7..9c179e4 100644
--- a/Components/Pages/Home.razor
+++ b/Components/Pages/Home.razor
@@ -55,7 +55,9 @@
                                         </MudText>
                                     </CardHeaderContent>
                                     <CardHeaderActions>
-                                        <MudIconButton Icon="@Icons.Material.Filled.Settings" Color="Color.Default" />
+                                        <MudIconButton Icon="@Icons.Material.Filled.Settings" 
+                                                    Color="Color.Default" 
+                                                    Href="@($"/workspace/{ws.Id}")" />
                                     </CardHeaderActions>
                                 </MudCardHeader>
                                 <MudCardContent>
diff --git a/Components/Pages/WorkspaceDetail.razor b/Components/Pages/WorkspaceDetail.razor
new file mode 100644
index 0000000..62ddc89
--- /dev/null
+++ b/Components/Pages/WorkspaceDetail.razor
@@ -0,0 +1,114 @@
+@page "/workspace/{*WorkspaceId}"
+@using ZahlenAnalyse.Web.Models
+@using ZahlenAnalyse.Web.Services
+@inject WorkspaceService DbService
+@inject ISnackbar Snackbar
+@inject NavigationManager NavManager
+
+<MudContainer MaxWidth="MaxWidth.Large" Class="mt-8 mb-8">
+    @if (_workspace == null)
+    {
+        <MudProgressCircular Indeterminate="true" />
+    }
+    else
+    {
+        <MudText Typo="Typo.h3" Class="mb-6">@_workspace.Name</MudText>
+
+        <MudGrid>
+            <MudItem xs="12" md="6">
+                <MudPaper Class="pa-6" Elevation="1">
+                    <MudText Typo="Typo.h6" Class="mb-4">Daten importieren</MudText>
+                    <MudText Typo="Typo.body2" Class="mb-4">Lade eine Excel-Datei hoch, um Fakten in diesen Workspace zu importieren.</MudText>
+                    
+                    <MudFileUpload T="IBrowserFile" FilesChanged="@(e => UploadFile(e))" Accept=".xlsx">
+                        <CustomContent>
+                            <MudButton Variant="Variant.Filled" 
+                                    Color="Color.Primary" 
+                                    StartIcon="@Icons.Material.Filled.CloudUpload"
+                                    OnClick="@context.OpenFilePickerAsync">
+                                Excel hochladen
+                            </MudButton>
+                        </CustomContent>
+                    </MudFileUpload>
+                </MudPaper>
+            </MudItem>
+
+            <MudItem xs="12" md="6">
+                <MudPaper Class="pa-6" Elevation="1">
+                    <MudText Typo="Typo.h6" Class="mb-4">Dimensionen</MudText>
+                    <MudStack Row="true" Wrap="Wrap.Wrap">
+                        @foreach (var dim in _workspace.Dimensions)
+                        {
+                            <MudChip T="string" Variant="Variant.Outlined" Color="Color.Info">@dim.Name</MudChip>
+                        }
+                    </MudStack>
+                </MudPaper>
+            </MudItem>
+
+            <MudItem xs="12">
+                <MudPaper Class="pa-6" Elevation="1">
+                    <MudText Typo="Typo.h6" Class="mb-4">Letzte Importe / Einträge</MudText>
+                    <MudTable Items="_recentFakten" Hover="true" Breakpoint="Breakpoint.Sm">
+                        <HeaderContent>
+                            <MudTh>Datum</MudTh>
+                            <MudTh>Betrag</MudTh>
+                            <MudTh>Details</MudTh>
+                        </HeaderContent>
+                        <RowTemplate>
+                            <MudTd>@context.Date.ToShortDateString()</MudTd>
+                            <MudTd>@context.Amount.ToString("N2") €</MudTd>
+                            <MudTd>@string.Join(" | ", context.Dimensions.Values)</MudTd>
+                        </RowTemplate>
+                    </MudTable>
+                </MudPaper>
+            </MudItem>
+        </MudGrid>
+    }
+</MudContainer>
+
+@code {
+    [Parameter] public string WorkspaceId { get; set; } = string.Empty;
+    private Workspace? _workspace;
+    private List<AnalysisFakt> _recentFakten = new();
+
+    protected override async Task OnInitializedAsync()
+    {
+        _workspace = await DbService.GetWorkspaceAsync(WorkspaceId);
+        if (_workspace != null)
+        {
+            _recentFakten = await DbService.GetFaktenForWorkspaceAsync(WorkspaceId);
+            _recentFakten = _recentFakten.Take(5).ToList();
+        }
+    }
+
+    private async Task UploadFile(Microsoft.AspNetCore.Components.Forms.IBrowserFile e)
+    {
+        var file = e;
+        if (file == null) return;
+
+        try
+        {
+            // 1. Datenstrom vom Browser öffnen
+            using var browserStream = file.OpenReadStream(maxAllowedSize: 1024 * 1024 * 10); // 10MB
+            
+            // 2. Den Stream komplett in den "Eimer" (Arbeitsspeicher) laden
+            using var memoryStream = new MemoryStream();
+            await browserStream.CopyToAsync(memoryStream);
+            
+            // 3. WICHTIG: Den Lese-Zeiger im Eimer wieder nach ganz oben setzen!
+            memoryStream.Position = 0;
+
+            // 4. Den fertigen MemoryStream an den Service übergeben
+            await DbService.ImportFromExcelAsync(WorkspaceId, memoryStream);
+            
+            Snackbar.Add("Import erfolgreich!", Severity.Success);
+            
+            // Die Tabelle mit den neuen Daten aktualisieren
+            _recentFakten = (await DbService.GetFaktenForWorkspaceAsync(WorkspaceId)).Take(5).ToList();
+        }
+        catch (Exception ex)
+        {
+            Snackbar.Add($"Fehler beim Import: {ex.Message}", Severity.Error);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Services/WorkspaceService.cs b/Services/WorkspaceService.cs
index 65b2541..fd3c996 100644
--- a/Services/WorkspaceService.cs
+++ b/Services/WorkspaceService.cs
@@ -1,6 +1,8 @@
 using Microsoft.AspNetCore.Components.Authorization;
 using Raven.Client.Documents;
 using ZahlenAnalyse.Web.Models;
+using ExcelDataReader;
+using System.Data;
 
 namespace ZahlenAnalyse.Web.Services;
 
@@ -118,4 +120,43 @@ public class WorkspaceService
             .OrderByDescending(f => f.Date)
             .ToListAsync();
     }
+
+    public async Task ImportFromExcelAsync(string workspaceId, Stream fileStream)
+{
+    // Encoding für deutsche Excel-Dateien
+    System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
+
+    using var reader = ExcelReaderFactory.CreateReader(fileStream);
+    var result = reader.AsDataSet(new ExcelDataSetConfiguration() {
+        ConfigureDataTable = (_) => new ExcelDataTableConfiguration() { UseHeaderRow = true }
+    });
+
+    var dataTable = result.Tables[0];
+    
+    using var session = _store.OpenAsyncSession();
+    
+    foreach (DataRow row in dataTable.Rows)
+    {
+        var fakt = new AnalysisFakt
+        {
+            WorkspaceId = workspaceId,
+            Date = Convert.ToDateTime(row["Datum"]),
+            Amount = Convert.ToDecimal(row["Betrag"]),
+            // Hier mappen wir dynamisch die Dimensionen
+            Dimensions = new Dictionary<string, string>()
+        };
+
+        // Wir gehen davon aus, dass deine Excel-Spaltennamen 
+        // den Dimensions-Namen entsprechen
+        foreach (var col in dataTable.Columns.Cast<DataColumn>().Skip(2)) // Datum/Betrag überspringen
+        {
+            fakt.Dimensions[col.ColumnName] = row[col.ColumnName].ToString() ?? "";
+        }
+
+        await EnrichWithAuditDataAsync(fakt);
+        await session.StoreAsync(fakt);
+    }
+    
+    await session.SaveChangesAsync();
+}
 }
\ No newline at end of file
diff --git a/ZahlenAnalyse.Web.csproj b/ZahlenAnalyse.Web.csproj
index d776c60..c2a883c 100644
--- a/ZahlenAnalyse.Web.csproj
+++ b/ZahlenAnalyse.Web.csproj
@@ -9,6 +9,8 @@
 
   <ItemGroup>
     <PackageReference Include="DotNetEnv" Version="3.2.0" />
+    <PackageReference Include="ExcelDataReader" Version="3.8.0" />
+    <PackageReference Include="ExcelDataReader.DataSet" Version="3.8.0" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="10.0.8" />
     <PackageReference Include="MudBlazor" Version="9.5.0" />
     <PackageReference Include="RavenDB.Client" Version="7.2.2" />