Merge pull request #34 from Quetzacoalt91/ps1.6-module-migration

Uninstall module used on PS 1.6 before using this one

Author: PierreRambaud

ps_googleanalytics.php

@@ -30,6 +30,11 @@
 
 class Ps_Googleanalytics extends Module
 {
+    /**
+     * @var string Name of the module running on PS 1.6.x. Used for data migration.
+     */
+    const PS_16_EQUIVALENT_MODULE = 'ganalytics';
+
     protected $js_state = 0;
     protected $eligible = 0;
     protected $filterable = 1;
@@ -59,6 +64,8 @@ public function install()
             Shop::setContext(Shop::CONTEXT_ALL);
         }
 
+        $this->uninstallPrestaShop16Module();
+
         if (parent::install() &&
             $this->registerHook('displayHeader') &&
             $this->registerHook('displayAdminOrder') &&
@@ -86,6 +93,30 @@ public function uninstall()
         return false;
     }
 
+    /**
+     * Migrate data from 1.6 equivalent module (if applicable), then uninstall
+     */
+    public function uninstallPrestaShop16Module()
+    {
+        if (!Module::isInstalled(self::PS_16_EQUIVALENT_MODULE)) {
+            return false;
+        }
+        $oldModule = Module::getInstanceByName(self::PS_16_EQUIVALENT_MODULE);
+        if ($oldModule) {
+            if (method_exists($oldModule, 'uninstallTab')) {
+                $oldModule->uninstallTab();
+            }
+            // This closure calls the parent class to prevent data to be erased
+            // It allows the new module to be configured without migration
+            $parentUninstallClosure = function() {
+                return parent::uninstall();
+            };
+            $parentUninstallClosure = $parentUninstallClosure->bindTo($oldModule, get_class($oldModule));
+            $parentUninstallClosure();
+        }
+        return true;
+    }
+
     /**
      * Creates tables
      */