Initial commit - TPU Survey System with Google Forms & Certificate Generator
This commit is contained in:
pongpon pitisuk
@@ -0,0 +1,247 @@
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<?php
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/**
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* Statistics API
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* GET ?action=summary&survey_id=X — Summary statistics
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* GET ?action=detail&survey_id=X — Detailed per-question stats
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*/
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require_once __DIR__ . '/../config/database.php';
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require_once __DIR__ . '/../config/auth.php';
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header('Content-Type: application/json; charset=utf-8');
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requireLogin();
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$action = $_GET['action'] ?? 'summary';
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$surveyId = (int)($_GET['survey_id'] ?? 0);
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if (!$surveyId) jsonResponse(['error' => 'Missing survey_id'], 400);
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// Check access
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$db = getDB();
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if (!isAdmin()) {
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$stmt = $db->prepare("SELECT user_id FROM surveys WHERE id = ?");
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$stmt->execute([$surveyId]);
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$survey = $stmt->fetch();
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if (!$survey || $survey['user_id'] != $_SESSION['user_id']) {
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jsonResponse(['error' => 'ไม่มีสิทธิ์'], 403);
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}
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}
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switch ($action) {
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case 'summary':
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getSummary($surveyId);
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break;
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case 'detail':
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getDetail($surveyId);
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break;
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default:
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jsonResponse(['error' => 'Invalid action'], 400);
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}
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function getSummary($surveyId) {
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$db = getDB();
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// Total responses
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$stmt = $db->prepare("SELECT COUNT(*) as total FROM survey_responses WHERE survey_id = ?");
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$stmt->execute([$surveyId]);
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$total = $stmt->fetch()['total'];
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// Get survey info
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$stmt = $db->prepare("SELECT title, status, created_at FROM surveys WHERE id = ?");
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$stmt->execute([$surveyId]);
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$surveyInfo = $stmt->fetch();
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// Get overall mean and SD for radio/rating questions
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$stmt = $db->prepare("
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SELECT
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AVG(CAST(ra.answer_value AS DECIMAL(10,2))) as overall_mean,
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STDDEV(CAST(ra.answer_value AS DECIMAL(10,2))) as overall_sd
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FROM response_answers ra
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JOIN survey_questions sq ON ra.question_id = sq.id
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JOIN survey_sections ss ON sq.section_id = ss.id
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WHERE ss.survey_id = ? AND sq.question_type = 'radio' AND sq.options IS NULL AND ra.answer_value REGEXP '^[0-9]+$'
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");
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$stmt->execute([$surveyId]);
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$overall = $stmt->fetch();
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jsonResponse([
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'survey' => $surveyInfo,
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'total_responses' => (int)$total,
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'overall_mean' => $overall['overall_mean'] ? round((float)$overall['overall_mean'], 2) : 0,
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'overall_sd' => $overall['overall_sd'] ? round((float)$overall['overall_sd'], 2) : 0
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]);
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}
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function getDetail($surveyId) {
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$db = getDB();
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// Total responses
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$stmt = $db->prepare("SELECT COUNT(*) as total FROM survey_responses WHERE survey_id = ?");
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$stmt->execute([$surveyId]);
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$totalResponses = (int)$stmt->fetch()['total'];
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// Get sections with questions
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$stmt = $db->prepare("SELECT * FROM survey_sections WHERE survey_id = ? ORDER BY section_number");
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$stmt->execute([$surveyId]);
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$sections = $stmt->fetchAll();
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$result = [];
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foreach ($sections as $section) {
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$qStmt = $db->prepare("SELECT * FROM survey_questions WHERE section_id = ? ORDER BY order_num");
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$qStmt->execute([$section['id']]);
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$questions = $qStmt->fetchAll();
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$sectionStats = [
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'section_number' => $section['section_number'],
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'title' => $section['title'],
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'headings' => [],
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'questions' => []
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];
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// Load headings for this section
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$headingStmt = $db->prepare("SELECT * FROM survey_headings WHERE section_id = ? ORDER BY order_num");
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$headingStmt->execute([$section['id']]);
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$headings = $headingStmt->fetchAll();
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foreach ($questions as $q) {
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$qStat = [
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'id' => $q['id'],
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'heading_id' => $q['heading_id'] ?? null,
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'question_text' => $q['question_text'],
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'question_type' => $q['question_type']
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];
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if ($q['question_type'] === 'radio' && empty($q['options'])) {
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// Calculate mean, SD, frequency for rating questions (1-5)
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$aStmt = $db->prepare("
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SELECT answer_value, COUNT(*) as cnt
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FROM response_answers
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WHERE question_id = ? AND answer_value REGEXP '^[0-9]+$'
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GROUP BY answer_value
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ORDER BY answer_value
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");
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$aStmt->execute([$q['id']]);
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$freqData = $aStmt->fetchAll();
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$frequencies = [];
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$values = [];
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$totalAnswers = 0;
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for ($i = 1; $i <= 5; $i++) {
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$frequencies[$i] = ['value' => $i, 'count' => 0, 'percentage' => 0];
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}
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foreach ($freqData as $fd) {
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$val = (int)$fd['answer_value'];
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if ($val >= 1 && $val <= 5) {
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$frequencies[$val]['count'] = (int)$fd['cnt'];
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$totalAnswers += (int)$fd['cnt'];
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for ($j = 0; $j < (int)$fd['cnt']; $j++) {
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$values[] = $val;
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}
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}
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}
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// Calculate percentages
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foreach ($frequencies as &$f) {
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$f['percentage'] = $totalAnswers > 0 ? round(($f['count'] / $totalAnswers) * 100, 1) : 0;
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}
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unset($f);
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// Calculate mean
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$mean = count($values) > 0 ? array_sum($values) / count($values) : 0;
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// Calculate SD
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$sd = 0;
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if (count($values) > 1) {
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$sumSquaredDiff = 0;
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foreach ($values as $v) {
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$sumSquaredDiff += pow($v - $mean, 2);
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}
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$sd = sqrt($sumSquaredDiff / (count($values) - 1));
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}
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// Interpretation
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$interpretation = '';
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if ($mean >= 4.51) $interpretation = 'มากที่สุด';
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elseif ($mean >= 3.51) $interpretation = 'มาก';
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elseif ($mean >= 2.51) $interpretation = 'ปานกลาง';
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elseif ($mean >= 1.51) $interpretation = 'น้อย';
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else $interpretation = 'น้อยที่สุด';
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$qStat['mean'] = round($mean, 2);
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$qStat['sd'] = round($sd, 2);
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$qStat['interpretation'] = $interpretation;
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$qStat['frequencies'] = array_values($frequencies);
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$qStat['total_answers'] = $totalAnswers;
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} elseif ($q['question_type'] === 'text') {
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// Collect text responses
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$aStmt = $db->prepare("
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SELECT answer_value FROM response_answers
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WHERE question_id = ? AND answer_value != ''
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ORDER BY id DESC
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");
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$aStmt->execute([$q['id']]);
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$qStat['text_responses'] = array_column($aStmt->fetchAll(), 'answer_value');
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$qStat['total_answers'] = count($qStat['text_responses']);
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} elseif (in_array($q['question_type'], ['dropdown', 'checkbox', 'radio'])) {
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// Frequency for dropdown/checkbox/custom radio
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$aStmt = $db->prepare("
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SELECT answer_value, COUNT(*) as cnt
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FROM response_answers
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WHERE question_id = ?
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GROUP BY answer_value
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ORDER BY cnt DESC
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");
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$aStmt->execute([$q['id']]);
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$freqData = $aStmt->fetchAll();
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$totalAnswers = array_sum(array_column($freqData, 'cnt'));
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$qStat['frequencies'] = array_map(function($fd) use ($totalAnswers) {
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return [
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'value' => $fd['answer_value'],
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'count' => (int)$fd['cnt'],
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'percentage' => $totalAnswers > 0 ? round(((int)$fd['cnt'] / $totalAnswers) * 100, 1) : 0
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];
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}, $freqData);
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$qStat['total_answers'] = $totalAnswers;
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}
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$sectionStats['questions'][] = $qStat;
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}
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// Build heading stats groups
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$headingStats = [];
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foreach ($headings as $h) {
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$hStat = [
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'id' => $h['id'],
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'title' => $h['title'],
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'description' => $h['description'],
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'questions' => []
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];
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foreach ($sectionStats['questions'] as $qs) {
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if (($qs['heading_id'] ?? null) == $h['id']) {
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$hStat['questions'][] = $qs;
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}
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}
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$headingStats[] = $hStat;
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}
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$sectionStats['headings'] = $headingStats;
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// Filter loose questions (no heading)
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$sectionStats['questions'] = array_values(array_filter($sectionStats['questions'], function($qs) {
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return empty($qs['heading_id']);
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}));
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$result[] = $sectionStats;
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}
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jsonResponse([
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'total_responses' => $totalResponses,
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'sections' => $result
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]);
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}
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