<?php
// api/hr.php
require_once dirname(__DIR__) . '/config/config.php';
require_once dirname(__DIR__) . '/config/database.php';

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

// Check if user is logged in
if (!isset($_SESSION['user_id'])) {
    echo json_encode(['status' => 'error', 'message' => 'Unauthorized']);
    exit;
}

$queryParam = $_POST['query'] ?? $_POST['cid'] ?? $_GET['query'] ?? $_GET['cid'] ?? '';

if (empty($queryParam)) {
    echo json_encode(['status' => 'error', 'message' => 'กรุณาระบุเลขบัตรประชาชน หรือ ชื่อ-สกุล']);
    exit;
}

$hos_pdo = Database::getHosInstance();

if (!$hos_pdo) {
    echo json_encode(['status' => 'error', 'message' => 'ไม่สามารถเชื่อมต่อฐานข้อมูล HR ได้']);
    exit;
}

try {
    $sql = "SELECT a.*, 
            b.HR_DEPARTMENT_SUB_SUB_NAME, 
            c.HR_LEVEL_NAME, 
            d.HR_PERSON_TYPE_NAME, 
            e.HR_PREFIX_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";

    $is_cid = (is_numeric(trim($queryParam)) && strlen(trim($queryParam)) === 13);
    
    if ($is_cid) {
        $sql .= " WHERE a.HR_CID = ? AND a.HR_STATUS_ID='01'";
        $stmt = $hos_pdo->prepare($sql);
        $stmt->execute([trim($queryParam)]);
    } else {
        $terms = explode(' ', preg_replace('/\s+/', ' ', trim($queryParam)));
        if (count($terms) > 1) {
            $sql .= " WHERE a.HR_FNAME LIKE ? AND a.HR_LNAME LIKE ? AND a.HR_STATUS_ID='01' LIMIT 10";
            $stmt = $hos_pdo->prepare($sql);
            $stmt->execute(["%{$terms[0]}%", "%{$terms[1]}%"]);
        } else {
            $sql .= " WHERE (a.HR_FNAME LIKE ? OR a.HR_LNAME LIKE ?) AND a.HR_STATUS_ID='01' LIMIT 10";
            $stmt = $hos_pdo->prepare($sql);
            $stmt->execute(["%{$terms[0]}%", "%{$terms[0]}%"]);
        }
    }

    $results = $stmt->fetchAll(PDO::FETCH_ASSOC);

    if (count($results) > 0) {
        $formatted_results = [];
        foreach ($results as $person) {
            $fullName = ($person['HR_PREFIX_NAME'] ?? '') . ($person['HR_FNAME'] ?? '') . ' ' . ($person['HR_LNAME'] ?? '');
            $department = $person['HR_DEPARTMENT_SUB_SUB_NAME'] ?? 'ไม่ระบุ';
            $position = ($person['HR_POSITION_NAME'] ?? '') . ' ' . ($person['HR_LEVEL_NAME'] ?? '');
            $person_type = $person['HR_PERSON_TYPE_NAME'] ?? 'ไม่ระบุ';
            $cid = $person['HR_CID'] ?? '';

            // Calculate work duration
            $work_duration = 'ไม่ระบุวันที่เริ่มงาน';
            if (!empty($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) {
                    // Keep default
                }
            }
            
            $formatted_results[] = [
                'cid' => $cid,
                'full_name' => trim($fullName),
                'department' => trim($department),
                'position' => trim($position),
                'person_type' => trim($person_type),
                'work_duration' => $work_duration
            ];
        }

        if (count($formatted_results) === 1) {
            echo json_encode([
                'status' => 'success',
                'message' => 'พบข้อมูลเจ้าหน้าที่',
                'data' => $formatted_results[0]
            ]);
        } else {
            echo json_encode([
                'status' => 'multiple',
                'message' => 'พบรายชื่อมากกว่า 1 คน กรุณาเลือกรายการที่ถูกต้อง',
                'data' => $formatted_results
            ]);
        }
    } else {
        echo json_encode(['status' => 'error', 'message' => 'ไม่พบข้อมูลเจ้าหน้าที่ หรือไม่ได้อยู่ในสถานะปฏิบัติงาน']);
    }

} catch (PDOException $e) {
    echo json_encode(['status' => 'error', 'message' => 'เกิดข้อผิดพลาดในการสืบค้นข้อมูล: ' . $e->getMessage()]);
}