<?php
session_start();
require_once '../includes/db_hr.php'; // โหลดการเชื่อมต่อ DB ตัวที่ 2
require_once '../includes/api_helper.php';

if (!isset($_SESSION['user_id'])) {
    jsonResponse(false, 'Unauthorized', [], 401);
}

if (!$pdo_hr) {
    jsonResponse(false, 'ไม่สามารถเชื่อมต่อฐานข้อมูล hosoffice_2566 ได้ กรุณาตั้งค่าใน includes/db_hr.php');
}

$keyword = $_GET['q'] ?? '';

if (empty($keyword) || mb_strlen($keyword, 'UTF-8') < 2) {
    jsonResponse(true, 'Success', []); // คืนค่าว่างถ้าคำค้นหาสั้นไป
}

try {
    $sql = "SELECT a.HR_CID, a.HR_FNAME, a.HR_LNAME, a.HR_STARTWORK_DATE, a.HR_PHONE, a.SEX,
            (a.HR_IMAGE IS NOT NULL AND LENGTH(a.HR_IMAGE) > 0) as HAS_IMAGE,
            e.HR_PREFIX_NAME, b.HR_DEPARTMENT_SUB_SUB_NAME, 
            c.HR_LEVEL_NAME, d.HR_PERSON_TYPE_NAME, f.HR_POSITION_NAME
            FROM hr_person a 
            LEFT OUTER JOIN hr_department_sub_sub b on a.HR_DEPARTMENT_SUB_SUB_ID = b.HR_DEPARTMENT_SUB_SUB_ID 
            LEFT OUTER JOIN hr_level c ON a.HR_LEVEL_ID = c.HR_LEVEL_ID 
            LEFT OUTER JOIN hr_person_type d ON a.HR_PERSON_TYPE_ID = d.HR_PERSON_TYPE_ID 
            LEFT OUTER JOIN hr_prefix e ON a.HR_PREFIX_ID=e.HR_PREFIX_ID 
            LEFT OUTER JOIN hr_position f ON a.HR_POSITION_ID=f.HR_POSITION_ID 
            WHERE (a.HR_FNAME LIKE ? OR a.HR_LNAME LIKE ? OR a.HR_CID LIKE ?) AND a.HR_STATUS_ID='01'
            LIMIT 15";
            
    $stmt = $pdo_hr->prepare($sql);
    $searchTerm = "%$keyword%";
    $stmt->execute([$searchTerm, $searchTerm, $searchTerm]);
    
    $raw_results = $stmt->fetchAll(PDO::FETCH_ASSOC);
    $results = [];
    
    foreach ($raw_results as $person) {
        $prefix = $person['HR_PREFIX_NAME'] ?? '';
        $fname = $person['HR_FNAME'] ?? '';
        $lname = $person['HR_LNAME'] ?? '';
        $fullName = trim($prefix . $fname . ' ' . $lname);
        $department = $person['HR_DEPARTMENT_SUB_SUB_NAME'] ?? 'ไม่ระบุ';
        $position = trim(($person['HR_POSITION_NAME'] ?? '') . ' ' . ($person['HR_LEVEL_NAME'] ?? ''));
        $person_type = $person['HR_PERSON_TYPE_NAME'] ?? 'ไม่ระบุ';

        $work_duration = 'ไม่ระบุวันที่เริ่มงาน';
        if (!empty($person['HR_STARTWORK_DATE'])) {
            try {
                $startDate = new DateTime($person['HR_STARTWORK_DATE']);
                $currentDate = new DateTime();
                if ($startDate <= $currentDate) {
                    $interval = $currentDate->diff($startDate);
                    $work_duration = $interval->format('%y ปี %m เดือน %d วัน');
                }
            } catch (Exception $e) { }
        }
        
        $results[] = [
            'prefix' => $prefix,
            'fname' => $fname,
            'lname' => $lname,
            'full_name' => $fullName,
            'department' => $department,
            'position' => $position,
            'person_type' => $person_type,
            'work_duration' => $work_duration,
            'phone' => $person['HR_PHONE'] ?? '',
            'sex' => $person['SEX'] ?? '',
            'has_image' => (bool)$person['HAS_IMAGE'],
            'cid' => $person['HR_CID']
        ];
    }
    
    jsonResponse(true, 'Success', $results);
} catch (PDOException $e) {
    jsonResponse(false, 'Database Error: ' . $e->getMessage());
}
?>