From c305ac2ad9cb1c71cbade45877b78e47d699f3a3 Mon Sep 17 00:00:00 2001
From: rWatcher <rwatcher@australia.edu>
Date: Sun, 28 Feb 2010 14:22:59 -0500
Subject: [PATCH] Scan existing photos for GPS coordinates.

---
 modules/exif_gps/helpers/exif_gps_task.php | 86 ++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 modules/exif_gps/helpers/exif_gps_task.php

diff --git a/modules/exif_gps/helpers/exif_gps_task.php b/modules/exif_gps/helpers/exif_gps_task.php
new file mode 100644
index 00000000..6158bc69
--- /dev/null
+++ b/modules/exif_gps/helpers/exif_gps_task.php
@@ -0,0 +1,86 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * Gallery - a web based photo album viewer and editor
+ * Copyright (C) 2000-2009 Bharat Mediratta
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+class exif_gps_task_Core {
+  static function available_tasks() {
+    // Automatically delete extra exif_coordinates whenever the maintance screen is loaded.
+    db::build()
+      ->delete("exif_coordinates")
+      ->where("item_id", "NOT IN",
+              db::build()->select("id")->from("items"))
+      ->execute();
+
+    // Display an option on the maintance screen for scanning existing photos
+    // for GPS data (in case photos were uploaded before the module was active).
+    return array(Task_Definition::factory()
+                 ->callback("exif_gps_task::update_gps_index")
+                 ->name(t("Extract Exif GPS data"))
+                 ->description(t("Scan all photos for missing GPS data"))
+                 ->severity(log::SUCCESS));
+  }
+
+  static function update_gps_index($task) {
+    $start = microtime(true);
+
+    $total = $task->get("total");
+    if (empty($total)) {
+      $task->set("total", $total = count(ORM::factory("item")->where("type", "=", "photo")->find_all()));
+      $task->set("last_id", 0);
+      $task->set("completed", 0);
+    }
+
+    $last_id = $task->get("last_id");
+    $completed = $task->get("completed");
+
+    $all_photos = ORM::factory("item")
+             ->where("id", ">", $last_id)
+             ->where("type", "=", "photo")
+             ->find_all(100);
+
+    foreach (ORM::factory("item")
+             ->where("id", ">", $last_id)
+             ->where("type", "=", "photo")
+             ->find_all(100) as $item) {
+
+      $record = ORM::factory("exif_coordinate")->where("item_id", "=", $item->id)->find();
+      if (!$record->loaded()) {
+        exif_gps::extract($item);
+      }
+      $last_id = $item->id;
+      $completed++;
+
+      if ($completed == $total || microtime(true) - $start > 1.5) {
+        break;
+      }
+    }
+
+    $task->set("completed", $completed);
+    $task->set("last_id", $last_id);
+
+    if ($total == $completed) {
+      $task->done = true;
+      $task->state = "success";
+      $task->percent_complete = 100;
+    } else {
+      $task->percent_complete = round(100 * $completed / $total);
+    }
+    $task->status = t2("One photo scanned", "%count / %total photos scanned", $completed,
+                       array("total" => $total));
+  }
+}