function run($preview = true)
 {
     $results = array();
     if (is_readable($this->file)) {
         $handle = fopen($this->file, "r");
         $first_row = true;
         while (($data = fgetcsv($handle, 4096, ",")) !== FALSE) {
             if ($first_row) {
                 $first_row = false;
                 continue;
             }
             // Process a row
             $result = array();
             $result['action'] = 'Import';
             $result['start_ts'] = strtotime($data[$this->column_mappings[SI_IMPORT_COLUMN_START]]);
             if (isset($this->column_mappings[SI_IMPORT_COLUMN_DURATION])) {
                 // Duration based import
                 $result['end_ts'] = $result['start_ts'] + floatval($data[$this->column_mappings[SI_IMPORT_COLUMN_DURATION]]) * 60 * 60;
             } else {
                 // Start and end time provided
                 $result['start_ts'] = strtotime($data[$this->column_mappings[SI_IMPORT_COLUMN_END]]);
             }
             if (isset($this->column_mappings[SI_IMPORT_COLUMN_COMMENTS])) {
                 $result['comments'] = $data[$this->column_mappings[SI_IMPORT_COLUMN_COMMENTS]];
             } else {
                 $results['comments'] = '';
             }
             $user = $data[$this->column_mappings[SI_IMPORT_COLUMN_USER]];
             $normalized_user = $this->normalize($user);
             if (empty($normalized_user)) {
                 $normalized_user = '******';
             }
             if ($this->users[$normalized_user]['action'] == SI_IMPORT_ACTION_SKIP) {
                 $result['user_id'] = 0;
                 $result['message'] = "Skipped because no user map for '{$user}' was configured";
                 $result['action'] = "Skip";
                 $results[] = $result;
                 continue;
             } else {
                 $result['user_id'] = $this->users[$normalized_user]['param'];
             }
             $task = $data[$this->column_mappings[SI_IMPORT_COLUMN_TASK]];
             $normalized_task = $this->normalize($task);
             if (empty($normalized_task)) {
                 $normalized_task = '_blank_';
             }
             if ($this->tasks[$normalized_task]['action'] == SI_IMPORT_ACTION_SKIP) {
                 $result['task_id'] = 0;
                 $result['message'] = "Skipped because no task map for '{$task}' was configured";
                 $result['action'] = "Skip";
                 $results[] = $result;
                 continue;
             } else {
                 $result['task_id'] = $this->tasks[$normalized_task]['param'];
             }
             $task = new SI_Task();
             $task->get($result['task_id']);
             $ic = $data[$this->column_mappings[SI_IMPORT_COLUMN_ITEMCODE]];
             $normalized_ic = $this->normalize($ic);
             if (empty($normalized_ic)) {
                 $normalized_ic = '_blank_';
             }
             if ($this->item_codes[$normalized_ic]['action'] == SI_IMPORT_ACTION_SKIP) {
                 $result['item_code_id'] = $task->getDefaultItemCode();
                 if ($result['item_code_id'] == 0) {
                     $result['message'] = "Skipped because no item code map for '{$ic}' was configured and no default item code exists for project";
                     $result['action'] = "Skip";
                     $results[] = $result;
                     continue;
                 } else {
                     $result['message'] = "Item Code retreived from project";
                 }
             } else {
                 $result['item_code_id'] = $this->item_codes[$normalized_ic]['param'];
             }
             if ($result['start_ts'] <= 0 || $result['end_ts'] <= 0) {
                 $result['message'] = "Invalid start or end time";
                 $result['action'] = "Skip";
                 $results[] = $result;
                 continue;
             }
             if ($result['start_ts'] > $result['end_ts']) {
                 $result['message'] = "Start Time is before end time";
                 $result['action'] = "Skip";
                 $results[] = $result;
                 continue;
             }
             if ($result['end_ts'] - $result['start_ts'] > 12 * 60 * 60) {
                 $result['message'] = "Length of time is too long, >12 hours";
                 $result['action'] = "Skip";
                 $results[] = $result;
                 continue;
             }
             $project = new SI_Project();
             $company = new SI_Company();
             $task = new SI_Task();
             $item_code = new SI_ItemCode();
             $task_activity = new SI_TaskActivity();
             $task_activity->start_ts = $result['start_ts'];
             $task_activity->end_ts = $result['end_ts'];
             $task_activity->task_id = $result['task_id'];
             $task_activity->user_id = $result['user_id'];
             $task_activity->text = $result['comments'];
             $task_activity->item_code_id = $result['item_code_id'];
             if ($task_activity->task_id > 0 || $task_activity->start_ts > 0 || $task_activity->end_ts > 0) {
                 if ($task_activity->task_id <= 0 || $task_activity->start_ts <= 0 || $task_activity->end_ts <= 0) {
                     $result['action'] = "Skip";
                     $result['message'] = "Skipping incomplete entry\n";
                     $results[] = $result;
                     continue;
                 }
             } else {
                 $result['action'] = "Skip";
                 $result['message'] = "Skipping incomplete entry\n";
                 $results[] = $result;
                 continue;
             }
             if ($task->get($task_activity->task_id) === FALSE) {
                 $result['action'] = "Skip";
                 $result['message'] = "Could not retreive task:\n" . $task->getLastError();
                 $results[] = $result;
                 continue;
             }
             if ($project->get($task->project_id) === FALSE) {
                 $result['action'] = "Skip";
                 $result['message'] = "Could not retreive project:\n" . $project->getLastError();
                 $results[] = $result;
                 continue;
             }
             $user = new SI_User();
             if ($user->get($task_activity->user_id) === FALSE) {
                 $result['action'] = "Skip";
                 $result['message'] = "Could not retreive user:\n" . $user->getLastError();
                 $results[] = $result;
                 continue;
             }
             $task_activity->hourly_cost = $user->hourly_rate;
             $company = $project->getCompany();
             if ($company === FALSE) {
                 $result['action'] = "Skip";
                 $result['message'] = "Could not get company information:\n" . $project->getLastError();
                 $results[] = $result;
                 continue;
             }
             $task_activity->hourly_rate = $item_code->getCompanyPrice($company->id, $task_activity->item_code_id);
             if ($task_activity->hourly_rate === FALSE) {
                 $result['action'] = "Skip";
                 $result['message'] = "Error getting price for this item code:\n" . $item_code->getLastError();
                 $results[] = $result;
                 continue;
             }
             $sct = $task->getSalesCommissionType();
             $task_activity->sales_com_type_id = $sct->id;
             if (!$preview) {
                 if (!$task_activity->add()) {
                     $result['action'] = "Skip";
                     $result['message'] = "Error adding Task Activity:\n" . $task_activity->getLastError();
                 }
             }
             $results[] = $result;
         }
     }
     return $results;
 }