';
		//print_r($options);
		//echo '
';

		// getting the answers
		$sql = "SELECT *, count(answer_id) as total FROM $table_survey_answer
					WHERE survey_id='".Database::escape_string($_GET['survey_id'])."'
					AND question_id = '".Database::escape_string($question['question_id'])."'
					GROUP BY option_id, value";
		$result = api_sql_query($sql, __FILE__, __LINE__);
		while ($row = mysql_fetch_assoc($result))
		{
			$number_of_answers += $row['total'];
			$data[$row['option_id']] = $row;
		}
		//echo '
';
		//print_r($data);
		//echo '
';

		// displaying the table: headers
		echo '';
		echo '	';
		echo '		';
		echo '		';
		echo '		';
		echo '		';
		echo '	';


		// displaying the table: the content
		foreach ($options as $key=>$value)
		{
			$absolute_number = $data[$value['question_option_id']]['total'];

			echo '	';
			echo '		';
			echo '		';
			echo '		';
			echo '		';
			echo '	';
		}

		// displaying the table: footer (totals)
		echo '	';
		echo '		';
		echo '		';
		echo '		';
		echo '		';
		echo '	';

		echo '
 
'.get_lang('AbsoluteTotal').'
'.get_lang('Percentage').'
'.get_lang('VisualRepresentation').'
'.$value['option_text'].'
'.$absolute_number.'
'.round($absolute_number/$number_of_answers*100, 2).' %
';
			$size = $absolute_number/$number_of_answers*100*2;
			if ($size > 0)
			{
				echo '
 
';
			}
			echo '		
'.get_lang('Total').'
'.$number_of_answers.'
 
 
';
	}

	if (isset($_GET['viewoption']))
	{
		echo get_lang('PeopleWhoAnswered').': '.$options[$_GET['viewoption']]['option_text'].'
';

		if (is_numeric($_GET['value']))
		{
			$sql_restriction = "AND value='".Database::escape_string($_GET['value'])."'";
		}

		$sql = "SELECT user FROM $table_survey_answer WHERE option_id = '".Database::escape_string($_GET['viewoption'])."' $sql_restriction";
		$result = api_sql_query($sql, __FILE__, __LINE__);
		while ($row = mysql_fetch_assoc($result))
		{
			echo ''.$row['user'].'
';
		}
	}
}

function display_question_report_score($survey_data, $question, $offset)
{
	// Database table definitions
	$table_survey_question 			= Database :: get_course_table(TABLE_SURVEY_QUESTION);
	$table_survey_question_option 	= Database :: get_course_table(TABLE_SURVEY_QUESTION_OPTION);
	$table_survey_answer 			= Database :: get_course_table(TABLE_SURVEY_ANSWER);

	// getting the options
	$sql = "SELECT * FROM $table_survey_question_option
				WHERE survey_id='".Database::escape_string($_GET['survey_id'])."'
				AND question_id = '".Database::escape_string($question['question_id'])."'
				ORDER BY sort ASC";
	$result = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = mysql_fetch_assoc($result))
	{
		$options[$row['question_option_id']] = $row;
	}

	// getting the answers
	$sql = "SELECT *, count(answer_id) as total FROM $table_survey_answer
				WHERE survey_id='".Database::escape_string($_GET['survey_id'])."'
				AND question_id = '".Database::escape_string($question['question_id'])."'
				GROUP BY option_id, value";
	$result = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = mysql_fetch_assoc($result))
	{
		$number_of_answers += $row['total'];
		$data[$row['option_id']][$row['value']] = $row;
	}

	/*
	echo '
';
	print_r($data);
	echo '
';
	*/

	// displaying the table: headers
	echo '';
	echo '	';
	echo '		';
	echo '		';
	echo '		';
	echo '		';
	echo '		';
	echo '	';


	// displaying the table: the content
	foreach ($options as $key=>$value)
	{
		for ($i=1; $i<=$question['max_value']; $i++)
		{
			$absolute_number = $data[$value['question_option_id']][$i]['total'];

			echo '	';
			echo '		';
			echo '		';
			echo '		';
			echo '		';
			echo '		';
			echo '	';
		}
	}
		// displaying the table: footer (totals)
		echo '	';
		echo '		';
		echo '		';
		echo '		';
		echo '		';
		echo '		';
		echo '	';

		echo '
 
'.get_lang('Score').'
'.get_lang('AbsoluteTotal').'
'.get_lang('Percentage').'
'.get_lang('VisualRepresentation').'
'.$value['option_text'].'
'.$i.'
'.$absolute_number.'
'.round($absolute_number/$number_of_answers*100, 2).' %
';
			$size = ($absolute_number/$number_of_answers*100*2);
			if ($size > 0)
			{
				echo '			
 
';
			}
			echo '		
'.get_lang('Total').'
 
'.$number_of_answers.'
 
 
';
}

/**
 * This functions displays the complete reporting
 *
 * @return html code
 *
 * @todo open questions are not in the complete report yet.
 *
 * @author Patrick Cool , Ghent University
 * @version February 2007
 */
function display_complete_report()
{
	// Database table definitions
	$table_survey_question 			= Database :: get_course_table(TABLE_SURVEY_QUESTION);
	$table_survey_question_option 	= Database :: get_course_table(TABLE_SURVEY_QUESTION_OPTION);
	$table_survey_answer 			= Database :: get_course_table(TABLE_SURVEY_ANSWER);

	// the form
	echo '
';

	/*// the export button
	echo '';*/
	
	echo '';
	
	echo ' '.get_lang('ExportCurrentReport').'';
	
	// the table
	echo '';

	// getting the number of options per question
	echo '	';
	echo '		';
	$sql = "SELECT questions.question_id, questions.type, questions.survey_question, count(options.question_option_id) as number_of_options
			FROM $table_survey_question questions LEFT JOIN $table_survey_question_option options
			ON questions.question_id = options.question_id
			/*WHERE questions.question_id = options.question_id*/
			AND questions.survey_id = '".Database::escape_string($_GET['survey_id'])."'
			GROUP BY questions.question_id";
	$result = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = mysql_fetch_assoc($result))
	{
		// we show the questions if
		// 1. there is no question filter and the export button has not been clicked
		// 2. there is a quesiton filter but the question is selected for display
		if (!($_POST['submit_question_filter']  OR $_POST['export_report']) OR in_array($row['question_id'], $_POST['questions_filter']))
		{
			// we do not show comment and pagebreak question types
			if ($row['type'] <> 'comment' AND $row['type'] <> 'pagebreak')
			{
				echo '		0)
				{
					echo ' colspan="'.$row['number_of_options'].'"';
				}
				echo '>';

				echo ' ';
				echo $row['survey_question'];
				echo '';
				echo '';
			}
		}
		$questions[$row['question_id']] = $row;
	}
	echo '	';

	// getting all the questions and options
	echo '	';
	echo '		'; // the user column
	$sql = "SELECT 	survey_question.question_id, survey_question.survey_id, survey_question.survey_question, survey_question.display, survey_question.sort, survey_question.type,
					survey_question_option.question_option_id, survey_question_option.option_text, survey_question_option.sort as option_sort
			FROM $table_survey_question survey_question
			LEFT JOIN $table_survey_question_option survey_question_option
			ON survey_question.question_id = survey_question_option.question_id
			WHERE survey_question.survey_id = '".Database::escape_string($_GET['survey_id'])."'
			ORDER BY survey_question.sort ASC";
	$result = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = mysql_fetch_assoc($result))
	{
		// we show the options if
		// 1. there is no question filter and the export button has not been clicked
		// 2. there is a quesiton filter but the question is selected for display
		if (!($_POST['submit_question_filter'] OR $_POST['export_report']) OR in_array($row['question_id'], $_POST['questions_filter']))
		{
			// we do not show comment and pagebreak question types
			if ($row['type'] <> 'comment' AND $row['type'] <> 'pagebreak')
			{
				echo '			';
				$possible_answers[$row['question_id']][$row['question_option_id']] =$row['question_option_id'];
			}
		}
	}
	echo '	';

	// getting all the answers of the users
	$old_user='';
	$answers_of_user = array();
	$sql = "SELECT * FROM $table_survey_answer WHERE survey_id='".Database::escape_string($_GET['survey_id'])."' ORDER BY user ASC";
	$result = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = mysql_fetch_assoc($result))
	{
		if ($old_user <> $row['user'] AND $old_user<>'')
		{
			display_complete_report_row($possible_answers, $answers_of_user, $old_user, $questions);
			$answers_of_user=array();
		}
		if ($questions[$row['question_id']]['type']<> 'open')
		{
			$answers_of_user[$row['question_id']][$row['option_id']] = $row;
		}
		else 
		{
			$answers_of_user[$row['question_id']][0] = $row;
		}
		$old_user = $row['user'];
	}
	display_complete_report_row($possible_answers, $answers_of_user, $old_user, $questions); // this is to display the last user

	echo '
';
	if ($_POST['submit_question_filter'] OR $_POST['export_report'])
	{
		echo '			';
	}
	echo '			';
	echo '
 
';
				echo $row['option_text'];
				echo '
';

	echo '
';
}


/**
 * This function displays a row (= a user and his/her answers) in the table of the complete report.
 *
 * @param array $possible_answers all the possible options
 * @param array $answers_of_user the answers of the user
 * @param string $user the user
 *
 * @todo rename $possible_answers to $possible_options ?
 *
 * @author Patrick Cool , Ghent University
 * @version February 2007
 */
function display_complete_report_row($possible_answers, $answers_of_user, $user, $questions)
{
	$table_survey_question = Database :: get_course_table(TABLE_SURVEY_QUESTION);
	echo '';
	
	if(intval($user)!==0)
	{
		$sql = 'SELECT firstname, lastname FROM '.Database::get_main_table(TABLE_MAIN_USER).' WHERE user_id='.intval($user);
		$rs = api_sql_query($sql, __FILE__, __LINE__);
		if($row = mysql_fetch_array($rs, MYSQL_ASSOC))
		{
			$user_displayed = $row['lastname'].' '.$row['firstname'];
		}
		else
		{
			$user_displayed = '-';
		}
		echo '		'.$user_displayed.''; // the user column
	}
	else
	{
		echo '		'.$user.''; // the user column
	}
	

	foreach ($possible_answers as $question_id=>$possible_option)
	{
		if ($questions[$question_id]['type'] == 'open')
		{
			echo '';
			echo $answers_of_user[$question_id]['0']['option_id'];
			echo '';
		}
		else 
		{		
			foreach ($possible_option as $option_id=>$value)
			{
				echo '';
				if (!empty($answers_of_user[$question_id][$option_id]))
				{
					if ($answers_of_user[$question_id][$option_id]['value']<>0)
					{
						echo $answers_of_user[$question_id][$option_id]['value'];
					}
					else
					{
						echo 'v';
					}
				}
			}
		}
		
	}
	echo '';
}


/**
 * the function is quite similar to display_complete_report and return a html string that can be used in a csv file
 *
 * @todo consider merging this function with display_complete_report
 *
 * @return string $return the content of a csv file
 *
 * @author Patrick Cool , Ghent University
 * @version February 2007
 */
function export_complete_report()
{
	// Database table definitions
	$table_survey_question 			= Database :: get_course_table(TABLE_SURVEY_QUESTION);
	$table_survey_question_option 	= Database :: get_course_table(TABLE_SURVEY_QUESTION_OPTION);
	$table_survey_answer 			= Database :: get_course_table(TABLE_SURVEY_ANSWER);

	// the first column
	$return = ';';

	$sql = "SELECT questions.question_id, questions.type, questions.survey_question, count(options.question_option_id) as number_of_options
			FROM $table_survey_question questions LEFT JOIN $table_survey_question_option options
			ON questions.question_id = options.question_id
			/*WHERE questions.question_id = options.question_id*/
			AND questions.survey_id = '".Database::escape_string($_GET['survey_id'])."'
			GROUP BY questions.question_id";
	$result = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = mysql_fetch_assoc($result))
	{
		// we show the questions if
		// 1. there is no question filter and the export button has not been clicked
		// 2. there is a quesiton filter but the question is selected for display
		if (!($_POST['submit_question_filter']  OR $_POST['export_report']) OR in_array($row['question_id'], $_POST['questions_filter']))
		{
			// we do not show comment and pagebreak question types
			if ($row['type'] <> 'comment' AND $row['type'] <> 'pagebreak')
			{
				for ($ii = 0; $ii < $row['number_of_options']; $ii ++)
				{
					$return .= html_entity_decode(strip_tags($row['survey_question'])).';';
				}
			}
		}
	}
	$return .= "\n";

	// getting all the questions and options
	$return .= ';';
	$sql = "SELECT 	survey_question.question_id, survey_question.survey_id, survey_question.survey_question, survey_question.display, survey_question.sort, survey_question.type,
					survey_question_option.question_option_id, survey_question_option.option_text, survey_question_option.sort as option_sort
			FROM $table_survey_question survey_question
			LEFT JOIN $table_survey_question_option survey_question_option
			ON survey_question.question_id = survey_question_option.question_id
			WHERE survey_question.survey_id = '".Database::escape_string($_GET['survey_id'])."'
			ORDER BY survey_question.sort ASC";
	$result = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = mysql_fetch_assoc($result))
	{
		// we show the options if
		// 1. there is no question filter and the export button has not been clicked
		// 2. there is a quesiton filter but the question is selected for display
		if (!($_POST['submit_question_filter'] OR $_POST['export_report']) OR in_array($row['question_id'], $_POST['questions_filter']))
		{
			// we do not show comment and pagebreak question types
			if ($row['type'] <> 'comment' AND $row['type'] <> 'pagebreak')
			{
				$return .= html_entity_decode(strip_tags($row['option_text'])).';';
				$possible_answers[$row['question_id']][$row['question_option_id']] =$row['question_option_id'];
			}
		}
	}
	$return .= "\n";

	// getting all the answers of the users
	$old_user='';
	$answers_of_user = array();
	$sql = "SELECT * FROM $table_survey_answer WHERE survey_id='".Database::escape_string($_GET['survey_id'])."' ORDER BY user ASC";
	$result = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = mysql_fetch_assoc($result))
	{
		if ($old_user <> $row['user'] AND $old_user<>'')
		{
			$return .= export_complete_report_row($possible_answers, $answers_of_user, $old_user);
			$answers_of_user=array();
		}
		$answers_of_user[$row['question_id']][$row['option_id']] = $row;
		$old_user = $row['user'];
	}
	$return .= export_complete_report_row($possible_answers, $answers_of_user, $old_user); // this is to display the last user

	return $return;
}


/**
 * add a line to the csv file
 *
 * @param array $possible_answers all the possible answers
 * @param array $answers_of_user the answers of the user
 * @param string $user the user
 *
 * @return string $return line of the csv file
 *
 * @todo rename $possible_answers to $possible_options ?
 *
 * @author Patrick Cool , Ghent University
 * @version February 2007
 */
function export_complete_report_row($possible_answers, $answers_of_user, $user)
{
	$return = $user.';'; // the user column

	foreach ($possible_answers as $question_id=>$possible_option)
	{
		foreach ($possible_option as $option_id=>$value)
		{
			if (!empty($answers_of_user[$question_id][$option_id]))
			{
				$return .= 'v';
			}
			$return .= ';';
		}
	}
	$return .= "\n";
	return $return;
}

/**
 * This function displays the comparative report which allows you to compare two questions
 * A comparative report creates a table where one question is on the x axis and a second question is on the y axis.
 * In the intersection is the number of people who have answerd positive on both options.
 *
 * @return html code
 *
 * @author Patrick Cool , Ghent University
 * @version February 2007
 */
function display_comparative_report()
{
	// allowed question types for comparative report
	$allowed_question_types = array('yesno', 'multiplechoice', 'multipleresponse', 'dropdown', 'percentage', 'score');

	// getting all the questions
	$questions = survey_manager::get_questions($_GET['survey_id']);

	// displaying an information message that only the questions with predefined answers can be used in a comparative report
	Display::display_normal_message(get_lang('OnlyQuestionsWithPredefinedAnswers'), false);

	// The form for selecting the axis of the table
	echo '
';
	// survey_id
	echo '';
	echo '';
	// X axis
	echo get_lang('SelectXAxis').': ';
	echo '';
	echo '---';
	foreach ($questions as $key=>$question)
	{
		if (in_array($question['type'], $allowed_question_types))
		{
			echo ''.substr(strip_tags($question['question']), 0, 50).'';
		}
	}
	echo '

';
	// Y axis
	echo get_lang('SelectYAxis').': ';
	echo '';
	echo '---';
	foreach ($questions as $key=>$question)
	{
		if (in_array($question['type'], $allowed_question_types))
		{
			echo ''.substr(strip_tags($question['question']), 0, 50).'';
		}
	}
	echo '

';
	echo '';
	echo '
';

	// getting all the information of the x axis
	if (isset($_GET['xaxis']) AND is_numeric($_GET['xaxis']))
	{
		$question_x = survey_manager::get_question($_GET['xaxis']);
	}

	// getting all the information of the y axis
	if (isset($_GET['yaxis']) AND is_numeric($_GET['yaxis']))
	{
		$question_y = survey_manager::get_question($_GET['yaxis']);
	}

	if (isset($_GET['xaxis']) AND is_numeric($_GET['xaxis']) AND isset($_GET['yaxis']) AND is_numeric($_GET['yaxis']))
	{
		// getting the answers of the two questions
		$answers_x = get_answers_of_question_by_user($_GET['survey_id'], $_GET['xaxis']);
		$answers_y = get_answers_of_question_by_user($_GET['survey_id'], $_GET['yaxis']);

		// displaying the table
		echo '';

		// the header
		echo '	';
		for ($ii=0; $ii<=count($question_x['answers']); $ii++)
		{
			if ($ii == 0)
			{
				echo '		';
			}
			else
			{
				if ($question_x['type']=='score')
				{
					for($x=1; $x<=$question_x['maximum_score']; $x++)
					{
						echo '		';
					}
					$x='';
				}
				else
				{
					echo '		';
				}
			}
		}
		echo '	';

		// the main part
		for ($ij=0; $ij';
					for ($ii=0; $ii<=count($question_x['answers']); $ii++)
					{
						if ($question_x['type']=='score')
						{
							for($x=1; $x<=$question_x['maximum_score']; $x++)
							{
								if ($ii == 0)
								{
									echo '		';
									break;
								}
								else
								{
									echo '		';
								}
							}
						}
						else
						{
							if ($ii == 0)
							{
								echo '		';
							}
							else
							{
								echo '		';
							}
						}
					}
					echo '	';
				}
			}
			// The Y axis is NOT a score question type so the number of rows = the number of options
			else
			{
				echo '	';
				for ($ii=0; $ii<=count($question_x['answers']); $ii++)
				{
						if ($question_x['type']=='score')
						{
							for($x=1; $x<=$question_x['maximum_score']; $x++)
							{
								if ($ii == 0)
								{
									echo '		';
									break;
								}
								else
								{
									echo '		';
								}
							}
						}
						else
						{
							if ($ii == 0)
							{
								echo '		';
							}
							else
							{
								echo '		';
							}
						}
				}
				echo '	';
			}
		}
		echo '
 
'.$question_x['answers'][($ii-1)].'
'.$x.'
'.$question_x['answers'][($ii-1)].'
'.$question_y['answers'][($ij)].' '.$y.'
';
									echo comparative_check($answers_x, $answers_y, $question_x['answersid'][($ii-1)], $question_y['answersid'][($ij)], $x, $y);
									echo '
'.$question_y['answers'][($ij)].' '.$y.'
';
								echo comparative_check($answers_x, $answers_y, $question_x['answersid'][($ii-1)], $question_y['answersid'][($ij)], 0, $y);
								echo '
'.$question_y['answers'][($ij)].'
';
									echo comparative_check($answers_x, $answers_y, $question_x['answersid'][($ii-1)], $question_y['answersid'][($ij)], $x, 0);
									echo '
'.$question_y['answers'][($ij)].'
';
								echo comparative_check($answers_x, $answers_y, $question_x['answersid'][($ii-1)], $question_y['answersid'][($ij)]);
								echo '
';
	}
}

/**
 * get all the answers of a question grouped by user
 *
 * @param integer $survey_id the id of the survey
 * @param integer $question_id the id of the question
 * @return array $return an array countaining all the answers of all the users grouped by user
 *
 * @author Patrick Cool , Ghent University
 * @version February 2007
 */
function get_answers_of_question_by_user($survey_id, $question_id)
{
	// Database table definitions
	$table_survey_question 			= Database :: get_course_table(TABLE_SURVEY_QUESTION);
	$table_survey_question_option 	= Database :: get_course_table(TABLE_SURVEY_QUESTION_OPTION);
	$table_survey_answer 			= Database :: get_course_table(TABLE_SURVEY_ANSWER);

	$sql = "SELECT * FROM $table_survey_answer
				WHERE survey_id='".Database::escape_string($survey_id)."'
				AND question_id='".Database::escape_string($question_id)."'
				ORDER BY USER ASC";
	$result = api_sql_query($sql, __FILE__, __LINE__);
	while ($row = mysql_fetch_assoc($result))
	{
		if ($row['value'] == 0)
		{
			$return[$row['user']][] = $row['option_id'];
		}
		else
		{
			$return[$row['user']][] = $row['option_id'].'*'.$row['value'];
		}

	}
	return $return;
}


/**
 * count the number of users who answer positively on both options
 *
 * @param array $answers_x all the answers of the x axis
 * @param array $answers_y all the answers of the y axis
 * @param integer $option_x the x axis value (= the option_id of the first question)
 * @param integer $option_y the y axis value (= the option_id of the second question)
 * @return integer the number of users who have answered positively on both options
 *
 * @author Patrick Cool , Ghent University
 * @version February 2007
 */
function comparative_check($answers_x, $answers_y, $option_x, $option_y, $value_x=0, $value_y=0)
{
	if ($value_x==0)
	{
		$check_x = $option_x;
	}
	else
	{
		$check_x = $option_x.'*'.$value_x;
	}
	if ($value_y==0)
	{
		$check_y = $option_y;
	}
	else
	{
		$check_y = $option_y.'*'.$value_y;
	}

	$counter = 0;
	foreach ($answers_x as $user => $answers)
	{
		// check if the user has given $option_x as answer
		if (in_array($check_x, $answers))
		{
			// check if the user has given $option_y as an answer
			if (in_array($check_y, $answers_y[$user]))
			{
				$counter++;
			}
		}
	}
	return $counter;
}
?>