Sindbad~EG File Manager

<?php
require_once '../config/config.php';

header('Content-Type: application/json');

// Verify access code
$input = json_decode(file_get_contents('php://input'), true);
$access_code = $input['access_code'] ?? '';

if (empty($access_code)) {
    echo json_encode(['success' => false, 'message' => 'Access code required']);
    exit;
}

$db = new Database();
$conn = $db->getConnection();

// Verify special code
$query = "SELECT * FROM special_codes WHERE code = ? AND is_active = 1 
          AND (expires_at IS NULL OR expires_at > NOW())";
$stmt = $conn->prepare($query);
$stmt->execute([$access_code]);
$code_info = $stmt->fetch();

if (!$code_info) {
    echo json_encode(['success' => false, 'message' => 'Invalid access code']);
    exit;
}

try {
    // Build WHERE clause based on filters
    $where_conditions = [];
    $params = [];
    
    if (!empty($input['program'])) {
        $where_conditions[] = "ar.program_id = ?";
        $params[] = $input['program'];
    }
    
    if (!empty($input['district'])) {
        $where_conditions[] = "ar.district_id = ?";
        $params[] = $input['district'];
    }
    
    if (!empty($input['officer_type'])) {
        $where_conditions[] = "ar.officer_type = ?";
        $params[] = $input['officer_type'];
    }
    
    if (!empty($input['from_date'])) {
        $where_conditions[] = "DATE(ar.submitted_at) >= ?";
        $params[] = $input['from_date'];
    }
    
    if (!empty($input['to_date'])) {
        $where_conditions[] = "DATE(ar.submitted_at) <= ?";
        $params[] = $input['to_date'];
    }
    
    $where_clause = !empty($where_conditions) ? 'WHERE ' . implode(' AND ', $where_conditions) : '';
    
    // Determine grouping based on group_by parameter
    $group_by = $input['group_by'] ?? 'district';
    $group_field = '';
    $group_name = '';
    
    switch ($group_by) {
        case 'officer_type':
            $group_field = 'ar.officer_type';
            $group_name = 'officer_type';
            break;
        default: // district
            $group_field = 'ld.name';
            $group_name = 'district_name';
            break;
    }
    
    // Get grouped data for chart
    $chart_query = "SELECT 
                        $group_field as group_label,
                        COUNT(ar.id) as count,
                        GROUP_CONCAT(DISTINCT ar.full_name ORDER BY ar.full_name SEPARATOR ', ') as names
                    FROM attendance_records ar 
                    JOIN programs p ON ar.program_id = p.id 
                    LEFT JOIN locations ld ON ar.district_id = ld.id 
                    LEFT JOIN locations la ON ar.assembly_id = la.id 
                    $where_clause
                    GROUP BY $group_field
                    ORDER BY count DESC, group_label ASC";
    
    $chart_stmt = $conn->prepare($chart_query);
    $chart_stmt->execute($params);
    $chart_data = $chart_stmt->fetchAll();
    
    // Get total statistics
    $stats_query = "SELECT 
                        COUNT(ar.id) as total_records,
                        COUNT(DISTINCT $group_field) as unique_groups
                    FROM attendance_records ar 
                    JOIN programs p ON ar.program_id = p.id 
                    LEFT JOIN locations ld ON ar.district_id = ld.id 
                    LEFT JOIN locations la ON ar.assembly_id = la.id 
                    $where_clause";
    
    $stats_stmt = $conn->prepare($stats_query);
    $stats_stmt->execute($params);
    $stats = $stats_stmt->fetch();
    
    // Calculate average per group
    $average_per_group = $stats['unique_groups'] > 0 ? round($stats['total_records'] / $stats['unique_groups'], 1) : 0;
    $stats['average_per_group'] = $average_per_group;
    
    // Process chart data for better display
    foreach ($chart_data as &$item) {
        // Limit names display to first 5 names for readability
        $names_array = explode(', ', $item['names']);
        if (count($names_array) > 5) {
            $item['names_display'] = implode(', ', array_slice($names_array, 0, 5)) . ' and ' . (count($names_array) - 5) . ' more';
        } else {
            $item['names_display'] = $item['names'];
        }
        
        // Ensure group_label is not null
        if (empty($item['group_label'])) {
            $item['group_label'] = 'Not Specified';
        }
    }
    
    echo json_encode([
        'success' => true,
        'stats' => $stats,
        'chart_data' => $chart_data,
        'group_by' => $group_by,
        'group_name' => $group_name
    ]);
    
} catch (Exception $e) {
    echo json_encode(['success' => false, 'message' => 'Database error: ' . $e->getMessage()]);
}
?>