Get informations about survey

classes/components/posts.php

@@ -188,6 +188,14 @@ class Posts {
 		$info["link_description"] = $src["description_page"];
 		$info["link_image"] = $src["image_page"];
 
+		//Survey specific
+		if($info['kind'] == "survey"){
+			$info["data_survey"] = CS::get()->components->survey->get_infos($info['ID']);
+		}
+		else {
+			$info["data_survey"] = null;
+		}
+
 		//Get informations about likes
 		$info["likes"] = CS::get()->components->likes->count($info["ID"], Likes::LIKE_POST);
 		$info["userlike"] = user_signed_in() ? CS::get()->components->likes->is_liking(userID, $info["ID"], Likes::LIKE_POST) : false;

classes/components/survey.php

@@ -0,0 +1,176 @@
+<?php
+/**
+ * Surveys component
+ * 
+ * @author Pierre HUBERT
+ */
+
+class Survey {
+
+	/**
+	 * Survey infos table
+	 */
+	const SURVEY_INFOS_TABLE = "sondage";
+
+	/**
+	 * Survey choices table
+	 */
+	const SURVEY_CHOICES_TABLE = "sondage_choix";
+
+	/**
+	 * Survey responses table
+	 */
+	const SURVEY_RESPONSE_TABLE = "sondage_reponse";
+
+	/**
+	 * Get informations about a survey
+	 * 
+	 * @param int $postID The ID of the post related to the survey
+	 * @return array Informations about the survey / empty array in case of failure
+	 */
+	public function get_infos(int $postID) : array {
+
+		$survey = array();
+
+		//Get informations about the survey
+		$survey['infos'] = $this->get_survey_infos($postID);
+
+		//Check for errors
+		if(count($survey['infos']) == 0)
+			return array();
+		
+		//Get the choices of the survey
+		$survey['choices'] = $this->get_survey_choices($survey['infos']['ID']);
+
+		//Get the choice of the user
+		$survey['user_choice'] = user_signed_in() ? $this->get_user_choice($survey['infos']['ID'], userID) : 0;
+		
+		return $survey;
+	}
+
+	/**
+	 * Get survey informations by post ID
+	 * 
+	 * @param int $postID The DI of the related post
+	 * @return array Informations about the survey, or an empty array in case
+	 * of failure
+	 */
+	private function get_survey_infos(int $postID) : array {
+
+		//Fetch the database
+		$conditions = "WHERE ID_texte = ?";
+		$condVals = array($postID);
+
+		$result = CS::get()->db->select($this::SURVEY_INFOS_TABLE, $conditions, $condVals);
+		
+		if(count($result) == 0)
+			return array();
+
+		else
+			return $this->parse_survey_infos($result[0]);
+	}
+
+	/**
+	 * Parse survey informations from database
+	 * 
+	 * @param array $db_infos Informations from the database
+	 * @return array Informations about the post
+	 */
+	private function parse_survey_infos(array $db_infos) : array {
+
+		$infos = array();
+
+		//Get informations
+		$infos['ID'] = $db_infos['ID'];
+		$infos['userID'] = $db_infos['ID_utilisateurs'];
+		$infos['postID'] = $db_infos['ID_texte'];
+		$infos['creation_time'] = strtotime($db_infos['date_creation']);
+		$infos['question'] = $db_infos['question'];
+
+		return $infos;
+	}
+
+	/**
+	 * Get survey choices
+	 * 
+	 * @param int $surveyID The ID of the target survey
+	 * @return array Informations about the choices of the survey
+	 */
+	private function get_survey_choices(int $surveyID) : array {
+
+		//Fetch the database
+		$conditions = "WHERE ID_sondage = ?";
+		$values = array($surveyID);
+
+		//Fetch the questions
+		$result = CS::get()->db->select($this::SURVEY_CHOICES_TABLE, $conditions, $values);
+
+		//Parse results
+		$choices = array();
+		foreach($result as $row){
+			$choice_infos = $this->parse_survey_choices($row);
+			$choices[$choice_infos["choiceID"]] = $choice_infos;
+		}
+
+		return $choices;
+
+	}
+
+	/**
+	 * Parse survey choices from database
+	 * 
+	 * @param array $db_infos Informations about the choice
+	 * @return array Usable informations about the surveay
+	 */
+	private function parse_survey_choices(array $db_infos) : array {
+		
+		$infos = array();
+
+		$infos['choiceID'] = $db_infos['ID'];
+		$infos['name'] = $db_infos['Choix'];
+		$infos['responses'] = $this->count_choices_responses($infos['choiceID']);
+
+		return $infos;
+
+	}
+
+	/**
+	 * Count the number of responses for a choice
+	 * 
+	 * @param int $choiceID The ID of the choice
+	 * @return int The number of response
+	 */
+	private function count_choices_responses(int $choiceID) : int {
+		
+		//Perform a request on the database
+		$conditions = "WHERE ID_sondage_choix = ?";
+		$values = array($choiceID);
+
+		return CS::get()->db->count($this::SURVEY_RESPONSE_TABLE, $conditions, $values);
+	}
+
+	/**
+	 * Get the user choice for a survey
+	 * 
+	 * @param int $surveyID The ID of the target survey
+	 * @param int $userID The ID of the target user
+	 * @return int The ID of the selected answer, or 0 if no response was given
+	 */
+	private function get_user_choice(int $surveyID, int $userID) : int {
+
+		//Perform a request on the database
+		$conditions = "WHERE ID_utilisateurs = ? AND ID_sondage = ?";
+		$values = array($userID, $surveyID);
+		$result = CS::get()->db->select($this::SURVEY_RESPONSE_TABLE, $conditions, $values);
+
+		//Check if no response was given
+		if(count($result) == 0)
+			return 0;
+
+		return $result[0]["ID_sondage_choix"];
+
+	}
+}
+
+//Register component
+Components::register("survey", new Survey());