From 9fe2bfe328145ac630d18929c0197c98402381f1 Mon Sep 17 00:00:00 2001
From: Silvio Rhatto <rhatto@riseup.net>
Date: Sun, 6 Nov 2011 14:21:34 -0200
Subject: Refactoring muamba_check_availability() and adding new views handlers

---
 muamba.db.inc       | 20 +++++++++++++++----
 muamba.handlers.inc | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 muamba.module       |  5 ++++-
 muamba.views.inc    | 20 +++++++++++++++++++
 4 files changed, 96 insertions(+), 5 deletions(-)

diff --git a/muamba.db.inc b/muamba.db.inc
index 0500dd9..21e2d8c 100644
--- a/muamba.db.inc
+++ b/muamba.db.inc
@@ -113,9 +113,13 @@ function muamba_get_transaction($mid) {
  *   Item nid or node object.
  *
  * @return
- *   Transaction nid there's an ongoing transaction.
+ *   Data of the ongoing transaction.
+ *
+ * @todo
+ *   There might be more than one active transaction for
+ *   a given item if they all are in the "requested" state.
  */
-function muamba_current_transaction($data) {
+function muamba_current_transaction($data, $owner = NULL) {
   if (is_object($data)) {
     $nid = (int) $data->nid;
   }
@@ -149,7 +153,7 @@ function muamba_current_transaction($data) {
  *   Item nid or node object.
  *
  * @return
- *   TRUE if user already requested an item, FALSE otherwise.
+ *   TRUE if item is borrowed, FALSE otherwise.
  */
 function muamba_check_availability($data) {
   if (is_object($data)) {
@@ -159,7 +163,15 @@ function muamba_check_availability($data) {
     $nid = (int) $data;
   }
 
-  $current = muamba_current_transaction($nid);
+  $query = db_select('muamba', 'm');
+  $query->fields('m', array('mid', 'nid', 'uid', 'owner', 'status', 'thread_id'));
+
+  $query
+    ->condition('m.nid', $nid, '=')
+    ->condition('m.active', '1', '=')
+    ->condition('m.status', MUAMBA_REQUESTED, '!=');
+
+  $current = $query->execute()->fetchAll();  
 
   if (empty($current)) {
     return TRUE;
diff --git a/muamba.handlers.inc b/muamba.handlers.inc
index e67ed80..d634d6c 100644
--- a/muamba.handlers.inc
+++ b/muamba.handlers.inc
@@ -30,3 +30,59 @@ class views_handler_filter_muamba_status extends views_handler_filter_in_operato
     }
   }
 }
+
+/**
+ * Field handler for muamba transaction status.
+ */
+class views_handler_field_muamba_available extends views_handler_field {
+  /**
+   * Implements views_handler_field#query().
+   *
+   * @see views_php_views_pre_execute()
+   */
+  function query() {
+    // Provide an field alias but don't actually alter the query.
+    $this->field_alias = 'views_muamba_available_' . $this->position;
+  }
+
+  /**
+   * Renders the field.
+   *
+   * @todo
+   *   Return also "Yes, you requested this item"
+   */
+  function render($values) {
+    if (muamba_check_availability($values->nid)) {
+      return t('Yes');
+    }
+
+    return t('No');
+  }
+}
+
+/**
+ * Field handler for muamba transaction status.
+ *
+ * @todo
+ */
+class views_handler_field_muamba_actions extends views_handler_field {
+  /**
+   * Implements views_handler_field#query().
+   *
+   * @see views_php_views_pre_execute()
+   */
+  function query() {
+    // Provide an field alias but don't actually alter the query.
+    $this->field_alias = 'views_muamba_actions_' . $this->position;
+  }
+
+  /**
+   * Renders the field.
+   *
+   * @todo
+   */
+  function render($values) {
+    dpm($values);
+    return "TODO";
+  }
+}
diff --git a/muamba.module b/muamba.module
index 3be6d6b..dfe7b21 100644
--- a/muamba.module
+++ b/muamba.module
@@ -107,6 +107,8 @@ function muamba_menu() {
 
 /**
  * Implements hook_node_view()
+ *
+ * @todo
  */
 function muamba_node_view($node, $view_mode, $langcode) {
   global $user;
@@ -117,7 +119,8 @@ function muamba_node_view($node, $view_mode, $langcode) {
   }
 
   if ($view_mode == 'full') {
-    $transaction             = muamba_current_transaction($node);
+    // @todo: there might be more than one transaction
+    $transaction             = muamba_current_transactions($node);
     $node->content['muamba'] = array(
       '#markup' => theme('muamba_widget', array('node' => $node, 'transaction' => $transaction)),
       '#weight' => 100,
diff --git a/muamba.views.inc b/muamba.views.inc
index 6e2ca1a..a7c58c1 100644
--- a/muamba.views.inc
+++ b/muamba.views.inc
@@ -154,5 +154,25 @@ function muamba_views_data() {
     ),
   );  
 
+  // Available items.
+  $data['muamba']['available'] = array(
+    'title'      => t('Availability'), 
+    'help'       => t('Available muamba items.'), 
+    'field' => array(
+      'help'    => t('Display muamba node availability information.'),
+      'handler' => 'views_handler_field_muamba_available', 
+    ), 
+  ); 
+
+  // Available actions.
+  $data['muamba']['actions'] = array(
+    'title'      => t('Actions'), 
+    'help'       => t('Available actions for an item.'), 
+    'field' => array(
+      'help'    => t('Display actions over an item.'),
+      'handler' => 'views_handler_field_muamba_actions', 
+    ), 
+  ); 
+
   return $data;
 }
-- 
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