[ios] Log event when offline pack is created

platform/darwin/src/MGLOfflineRegion_Private.h

@@ -14,6 +14,11 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (const mbgl::OfflineRegionDefinition)offlineRegionDefinition;
 
+/**
+ Attributes to be passed into the offline download start event
+ */
+@property (nonatomic, readonly) NSDictionary *offlineStartEventAttributes;
+
 @end
 
 NS_ASSUME_NONNULL_END

platform/darwin/src/MGLOfflineStorage.mm

@@ -7,11 +7,17 @@
 #import "MGLOfflinePack_Private.h"
 #import "MGLOfflineRegion_Private.h"
 #import "MGLTilePyramidOfflineRegion.h"
+#import "MGLShapeOfflineRegion.h"
 #import "NSBundle+MGLAdditions.h"
 #import "NSValue+MGLAdditions.h"
 #import "NSDate+MGLAdditions.h"
 #import "NSData+MGLAdditions.h"
 
+#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
+#import "MMEConstants.h"
+#import "MGLMapboxEvents.h"
+#endif
+
 #include <mbgl/actor/actor.hpp>
 #include <mbgl/actor/scheduler.hpp>
 #include <mbgl/storage/resource_transform.hpp>
@@ -361,6 +367,17 @@ const MGLExceptionName MGLUnsupportedRegionTypeException = @"MGLUnsupportedRegio
         if (completion) {
             completion(pack, error);
         }
+            
+        #if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
+            NSMutableDictionary *offlineDownloadStartEventAttributes = [NSMutableDictionary dictionaryWithObject:MMEventTypeOfflineDownloadStart forKey:MMEEventKeyEvent];
+        
+            if ([region conformsToProtocol:@protocol(MGLOfflineRegion_Private)]) {
+                NSDictionary *regionAttributes = ((id<MGLOfflineRegion_Private>)region).offlineStartEventAttributes;
+                [offlineDownloadStartEventAttributes addEntriesFromDictionary:regionAttributes];
+            }
+        
+            [MGLMapboxEvents pushEvent:MMEventTypeOfflineDownloadStart withAttributes:offlineDownloadStartEventAttributes];
+        #endif
     }];
 }
 

platform/darwin/src/MGLShapeOfflineRegion.mm

@@ -12,6 +12,10 @@
 #import "MGLShape_Private.h"
 #import "MGLStyle.h"
 
+#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
+#import "MMEConstants.h"
+#endif
+
 @interface MGLShapeOfflineRegion () <MGLOfflineRegion_Private, MGLShapeOfflineRegion_Private>
 
 @end
@@ -22,6 +26,17 @@
 
 @synthesize styleURL = _styleURL;
 
+-(NSDictionary *)offlineStartEventAttributes {
+    return @{
+             #if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
+             MMEEventKeyShapeForOfflineRegion: @"shaperegion",
+             MMEEventKeyMinZoomLevel: @(self.minimumZoomLevel),
+             MMEEventKeyMaxZoomLevel: @(self.maximumZoomLevel),
+             MMEEventKeyStyleURL: self.styleURL
+             #endif
+             };
+}
+
 + (BOOL)supportsSecureCoding {
     return YES;
 }

platform/darwin/src/MGLTilePyramidOfflineRegion.mm

@@ -9,6 +9,10 @@
 #import "MGLGeometry_Private.h"
 #import "MGLStyle.h"
 
+#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
+#import "MMEConstants.h"
+#endif
+
 @interface MGLTilePyramidOfflineRegion () <MGLOfflineRegion_Private, MGLTilePyramidOfflineRegion_Private>
 
 @end
@@ -19,6 +23,17 @@
 
 @synthesize styleURL = _styleURL;
 
+-(NSDictionary *)offlineStartEventAttributes {
+    return @{
+             #if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
+             MMEEventKeyShapeForOfflineRegion: @"tileregion",
+             MMEEventKeyMinZoomLevel: @(self.minimumZoomLevel),
+             MMEEventKeyMaxZoomLevel: @(self.maximumZoomLevel),
+             MMEEventKeyStyleURL: self.styleURL
+             #endif
+             };
+}
+
 + (BOOL)supportsSecureCoding {
     return YES;
 }