From 23ae0015907278c8d2d3363f9824ef93b8d3b23b Mon Sep 17 00:00:00 2001
From: Matthias Neeracher <neeri@users.sourceforge.net>
Date: Thu, 18 Aug 2011 19:15:32 +0200
Subject: [PATCH] Eliminate duplicate media

---
 Medianno/MADocument.mm | 36 +++++++++++++++++++++++++++---------
 1 file changed, 27 insertions(+), 9 deletions(-)

diff --git a/Medianno/MADocument.mm b/Medianno/MADocument.mm
index 3e16378..ce7d7be 100644
--- a/Medianno/MADocument.mm
+++ b/Medianno/MADocument.mm
@@ -42,17 +42,35 @@
 
 - (void)addMediaURL:(NSURL *)url name:(NSString *)name date:(NSDate *)date
 {
-    NSManagedObjectContext *moc = [self managedObjectContext];
-    MAMedia * media = [NSEntityDescription insertNewObjectForEntityForName:@"MAMedia" inManagedObjectContext:moc];
-    NSString * path = [url path];
-    NSNumber * size;
+    NSString *      path        = [url path];
+    NSNumber *      size;
     [url getResourceValue:&size forKey:NSURLFileSizeKey error:nil];
-    
+    int64_t         fileSize    = [size longLongValue];
+    NSTimeInterval  fileDate    = [date timeIntervalSinceReferenceDate];
+
+    NSManagedObjectContext *moc     = [self managedObjectContext];
+    MAMedia *               media   = nil;
+    //
+    // Look for existing file with same name, file size, and (preferably) date first.
+    // Since the date may be parsed from the file name (and subject to a later fix),
+    // we tolerate mismatches.
+    //
+    NSFetchRequest *        fetch   = [NSFetchRequest fetchRequestWithEntityName:@"MAMedia"];
+    [fetch setPredicate:[NSPredicate predicateWithFormat:@"name == %@", name]];
+    for (MAMedia * m in [moc executeFetchRequest:fetch error:nil]) 
+        if (m.size == fileSize) {
+            media = m;
+            if (m.date == fileDate)
+                break;
+        }
+    if (!media) {
+        media = [NSEntityDescription insertNewObjectForEntityForName:@"MAMedia" inManagedObjectContext:moc];
+        media.size  = fileSize;
+        media.name  = name;
+        media.notes = @"";
+    }
+    media.date  = fileDate;
     media.media = path;
-    media.date  = [date timeIntervalSinceReferenceDate];
-    media.name  = name;
-    media.notes = @"";
-    media.size  = size ? [size longLongValue] : 0;
 }
 
 #pragma mark Annotation management