Can get information about a group

classes/components/GroupsComponent.php

@@ -51,6 +51,46 @@ class GroupsComponent {
         return $groupID;
     }
 
+    /**
+     * Get and return information about a group
+     * 
+     * @param int $id The ID of the target group
+     * @return GroupInfo Information about the group / invalid
+     * object in case of failure
+     */
+    public function get_info(int $id) : GroupInfo {
+
+        //Query the database
+        $info = db()->select(self::GROUPS_LIST_TABLE, "WHERE id = ?", array($id));
+
+        //Check for results
+        if(count($info) == 0)
+            return new GroupInfo(); //Return invalid object
+        
+        //Create and fill GroupInfo object with database entry
+        return $this->dbToGroupInfo($info[0]);
+    }
+
+    /**
+     * Get and return advanced information about a group
+     * 
+     * @param int $id The ID of the target group
+     * @return GroupInfo Information about the group / invalid
+     * object in case of failure
+     */
+    public function get_advanced_info(int $id) : AdvancedGroupInfo {
+
+        //Query the database
+        $info = db()->select(self::GROUPS_LIST_TABLE, "WHERE id = ?", array($id));
+
+        //Check for results
+        if(count($info) == 0)
+            return new AdvancedGroupInfo(); //Return invalid object
+        
+        //Create and fill GroupInfo object with database entry
+        return $this->dbToAdvancedGroupInfo($info[0]);
+    }
+
     /**
      * Insert a new group member
      * 
@@ -66,6 +106,56 @@ class GroupsComponent {
         ));
     }
 
+    /**
+     * Count the number of members of a group
+     * 
+     * @param int $id The ID of the target group
+     * @return int The number of members of the group
+     */
+    private function countMembers(int $id) : int {
+        return db()->count(self::GROUPS_MEMBERS_TABLE, 
+            "WHERE groups_id = ?",
+            array($id));
+    }
+
+    /**
+     * Turn a database entry into a GroupInfo object
+     * 
+     * @param array $data Database entry
+     * @param GroupInfo $group The object to fill with the information (optionnal)
+     * @return GroupInfo Generated object
+     */
+    private function dbToGroupInfo(array $data, GroupInfo $info = null) : GroupInfo {
+
+        if($info == null)
+            $info = new GroupInfo();
+
+        $info->set_id($data["id"]);
+        $info->set_name($data["name"]);
+        $info->set_number_members($this->countMembers($info->get_id()));
+
+        return $info;
+
+    }
+
+    /**
+     * Turn a database entry into AdvancedGroupInfo object entry
+     * 
+     * @param array $data Database entry
+     * @return AdvancedGroupInfo Advanced information about the group
+     */
+    private function dbToAdvancedGroupInfo(array $data) : AdvancedGroupInfo {
+
+        //Parse basical information about the group
+        $info = new AdvancedGroupInfo();
+        $this->dbToGroupInfo($data, $info);
+
+        //Parse advanced information
+        $info->set_time_create($data["time_create"]);
+
+        return $info;
+
+    }
 }
 
 //Register component

classes/models/AdvancedGroupInfo.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * Advanced information about a group model
+ * 
+ * @author Pierre HUBERT
+ */
+
+//Make sure that GroupInfo has already been included
+require_once __DIR__."/GroupInfo.php";
+
+class AdvancedGroupInfo extends GroupInfo {
+
+    //Private fields
+    private $time_create = -1;
+
+    //Get and set the creation time of the group
+    public function set_time_create(int $time_create){
+		$this->time_create = $time_create;
+	}
+
+	public function has_time_create() : bool {
+		return $this->time_create > -1;
+	}
+
+	public function get_time_create() : int {
+		return $this->time_create;
+    }
+
+}

classes/models/GroupInfo.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * Group information model
+ * 
+ * @author Pierre HUBERT
+ */
+
+class GroupInfo extends BaseUniqueObject {
+
+    //Private fields
+    private $name;
+    private $number_members = -1;
+
+    
+    
+    //Get and set the name of group
+    public function set_name(string $name){
+		$this->name = $name == "" ? null : $name;
+	}
+
+	public function has_name() : bool {
+		return $this->name != null;
+	}
+
+	public function get_name() : string {
+		return $this->name != null ? $this->name : "null";
+    }
+    
+    //Get and set the number of members of the group
+    public function set_number_members(int $number_members){
+		$this->number_members = $number_members;
+	}
+
+	public function has_number_members() : bool {
+		return $this->number_members > -1;
+	}
+
+	public function get_number_members() : int {
+		return $this->number_members;
+    }
+}