Fix prepdoc source not found (#235)

## Purpose
<!-- Describe the intention of the changes being proposed. What problem
does it solve or functionality does it add? -->
* ...

## Does this introduce a breaking change?
<!-- Mark one with an "x". -->
```
[ ] Yes
[ ] No
```

## Pull Request Type
What kind of change does this Pull Request introduce?

<!-- Please check the one that applies to this PR using "x". -->
```
[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:
```

## How to Test
*  Get the code

```
git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install
```

* Test the code
<!-- Add steps to run the tests suite and/or manually test -->
```
```

## What to Check
Verify that the following are valid
* ...

## Other Information
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Author: LittleLittleCloud

app/functions/EmbedFunctions/Services/AzureSearchEmbedService.cs

@@ -24,7 +24,7 @@ public async Task<bool> EmbedBlobAsync(Stream blobStream, string blobName)
         try
         {
             await EnsureSearchIndexAsync(searchIndexName);
-
+            Console.WriteLine($"Embedding blob '{blobName}'");
             var pageMap = await GetDocumentTextAsync(blobStream, blobName);
 
             var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(blobName);
@@ -128,6 +128,7 @@ private async Task<IReadOnlyList<PageDetail>> GetDocumentTextAsync(Stream blobSt
         logger?.LogInformation(
             "Extracting text from '{Blob}' using Azure Form Recognizer", blobName);
 
+        Console.WriteLine($"Extracting text from '{blobName}' using Azure Form Recognizer");
         using var ms = new MemoryStream();
         blobStream.CopyTo(ms);
         ms.Position = 0;
@@ -184,7 +185,7 @@ private async Task<IReadOnlyList<PageDetail>> GetDocumentTextAsync(Stream blobSt
             pageMap.Add(new PageDetail(i, offset, pageText.ToString()));
             offset += pageText.Length;
         }
-
+        Console.WriteLine($"Extracted {pageMap.Count} pages from '{blobName}'");
         return pageMap.AsReadOnly();
     }
 
@@ -374,9 +375,7 @@ private static int FindPage(IReadOnlyList<PageDetail> pageMap, int offset)
         return length - 1;
     }
 
-    private static string BlobNameFromFilePage(string blobName, int page = 0) => Path.GetExtension(blobName).ToLower() is ".pdf"
-            ? $"{Path.GetFileNameWithoutExtension(blobName)}-{page}.pdf"
-            : Path.GetFileName(blobName);
+    private static string BlobNameFromFilePage(string blobName, int page = 0) => blobName;
 
     private async Task IndexSectionsAsync(string searchIndexName, IEnumerable<Section> sections, string blobName)
     {

app/prepdocs/PrepareDocs/Program.cs

@@ -59,11 +59,7 @@ static async Task ProcessSingleFileAsync(AppOptions options, string fileName, IE
                     return;
                 }
 
-                await UploadBlobsAsync(options, fileName);
-                using (var stream = File.OpenRead(fileName))
-                {
-                    await embedService.EmbedBlobAsync(stream, fileName);
-                }
+                await UploadBlobsAndCreateIndexAsync(options, fileName, embedService);
             }
         }
     });
@@ -159,8 +155,8 @@ Removing sections from '{fileName ?? "all"}' from search index '{options.SearchI
     }
 }
 
-static async ValueTask UploadBlobsAsync(
-    AppOptions options, string fileName)
+static async ValueTask UploadBlobsAndCreateIndexAsync(
+    AppOptions options, string fileName, IEmbedService embeddingService)
 {
     var container = await GetBlobContainerClientAsync(options);
 
@@ -190,6 +186,11 @@ static async ValueTask UploadBlobsAsync(
                 {
                     ContentType = "application/pdf"
                 });
+
+                // revert stream position
+                stream.Position = 0;
+
+                await embeddingService.EmbedBlobAsync(stream, documentName);
             }
             finally
             {
@@ -201,6 +202,7 @@ static async ValueTask UploadBlobsAsync(
     {
         var blobName = BlobNameFromFilePage(fileName);
         await UploadBlobAsync(fileName, blobName, container);
+        await embeddingService.EmbedBlobAsync(File.OpenRead(fileName), blobName);
     }
 }