gistfile1.m

- (NSArray *)timelineRecordsFromEvents:(NSArray *)events {
    WOTimelineRecord *lastRecord = [self.items lastObject];
    WOTimeLineSessionGroup *lastSessionGroup = (lastRecord.type == WOTimelineRecordTypeGroupedAuthEvents) ? lastRecord.item : nil;
    
    NSMutableArray *newRecords = [NSMutableArray new];
    NSMutableArray *sessionEvents = [NSMutableArray new];
    
    for (int i = 0; i < [events count]; i++) {
        WOTimeLineEvent *event = events[i];
 
        if (event.type == WOEventTypeSession) {
            [sessionEvents addObject:event];
            WOTimeLineSessionGroupType groupType = WOTimeLineSessionGroupTypeSingle;
            //grouping auth events
            for (int j = i + 1; j < [events count]; j++) {
                event = events[j];
                if (event.type == WOEventTypeSession) {
                    WOTimelineAuthEvent *prevEvent = [sessionEvents lastObject];
                    [sessionEvents addObject:event];
                    BOOL shouldGroupAsSingle = [self shouldGroupAsSingeWihtAuthEvent1:prevEvent authEvent2:(WOTimelineAuthEvent *)event];
                    if (!shouldGroupAsSingle && groupType == WOTimeLineSessionGroupTypeSingle) {
                        groupType = WOTimeLineSessionGroupTypeMulti;
                    }
                    if (j + 1 == [events count]) {
                        i = j + 1;
                        if (lastSessionGroup) {
                            [lastSessionGroup addEvents:sessionEvents];
                        } else {
                            [newRecords addObject:[WOTimelineRecord authEventRecordWithEvents:sessionEvents groupType:groupType]];
                        }
                        break;
                    }
                }
                else {
                    if (!lastSessionGroup) {
                        [newRecords addObject:[WOTimelineRecord authEventRecordWithEvents:sessionEvents groupType:groupType]];
                    }
                    else {
                        [lastSessionGroup addEvents:sessionEvents];
                        lastSessionGroup = nil;
                    }
                    [sessionEvents removeAllObjects];
 
                    i = j;
                    break;
                }
            }
        }
        
        if (i + 1 >= [events count] ) {
            break;
        }
        
        WOTimelineRecord *record = [WOTimelineRecord new];
        record.item = event;
        record.type = WOTimelineRecordTypeEvent;
        [newRecords addObject:record];
    }
    
    return newRecords;
}