<?php
// 오류 출력을 버퍼링하여 JSON 응답이 깨지지 않도록 함
ob_start();

require_once($_SERVER['DOCUMENT_ROOT'] . "/session.php");

// 권한 확인
if(!isset($_SESSION["level"]) || $_SESSION["level"]>5) { 
    ob_clean();
    http_response_code(403);
    header('Content-Type: application/json');
    echo json_encode(['success' => false, 'message' => '권한이 없습니다.']);
    exit;
}
 
// JSON 데이터 받기
$input = file_get_contents('php://input');
$data = json_decode($input, true); 
 
if (!$data) { 
    ob_clean();
    header('Content-Type: application/json');
    echo json_encode(['success' => false, 'message' => '잘못된 데이터입니다.']);
    exit;
}

// 데이터베이스 연결
require_once($_SERVER['DOCUMENT_ROOT'] . "/lib/mydb.php");
$pdo = db_connect();

// 트랜잭션 상태 추적 변수 
$transactionStarted = false;

try {
    // 디버깅을 위한 로그
    error_log("Received data: " . print_r($data, true));
    
    $pdo->beginTransaction();
    $transactionStarted = true;
    error_log("트랜잭션 시작됨");
    
    // work_num 처리 로직
    $parentnum = null;
    
    if (!empty($data['work_num']) && is_numeric($data['work_num'])) {
        // work_num이 있는 경우 해당 번호가 존재하는지 확인
        $checkSql = "SELECT num FROM work WHERE num = ?"; 
        $checkStmt = $pdo->prepare($checkSql);
        $checkStmt->execute([$data['work_num']]);
        
        if ($checkStmt->rowCount() > 0) {
            $parentnum = $data['work_num'];
        } else {
            throw new Exception('존재하지 않는 작업 번호입니다: ' . $data['work_num']);
        }
    } else {
        // work_num이 없으면 work 테이블 없이 handover만 저장 (parentnum을 NULL로)
        // 또는 work 테이블에 최소한의 레코드 생성 시도
        try {
            // work 테이블에 기본 레코드 생성 시도
            $workSql = "INSERT INTO work () VALUES ()";
            $workStmt = $pdo->prepare($workSql);
            $workStmt->execute();
            $parentnum = $pdo->lastInsertId();
            error_log("빈 work 레코드 생성됨: " . $parentnum);
        } catch (PDOException $workError) {
            error_log("work 테이블 생성 실패: " . $workError->getMessage());
            // work 레코드 생성에 실패하면 parentnum을 NULL로 설정
            $parentnum = null;
            error_log("parentnum을 NULL로 설정");
        }
    }
    
    error_log("parentnum 설정됨: " . $parentnum);
    
    if (empty($data['handover_num'])) {
        // 새 데이터 삽입
        $sql = "INSERT INTO work_handover (
            parentnum, workplacename, firstord, secondord, completion_date, 
            contract_amount, contract_items, execution_status, secondary_piping, 
            painting_caulking, equipment_cost, special_notes, meeting_attendees,
            contract_manager_signature, contract_manager_date,
            construction_pm_signature, construction_pm_date,
            department_head_signature, department_head_date,
            ceo_signature, ceo_date,
            priceIncludesVat,
            regist_day, regist_user, is_deleted
        ) VALUES (
            ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, NOW(), ?, 'N'
        )";
        
        $stmt = $pdo->prepare($sql);
        $stmt->execute([
            $parentnum,
            $data['workplacename'],
            $data['firstord'],
            $data['secondord'],
            $data['completion_date'],
            $data['contract_amount'],
            $data['contract_items'],
            $data['execution_status'],
            $data['secondary_piping'],
            $data['painting_caulking'],
            $data['equipment_cost'],
            $data['special_notes'],
            $data['meeting_attendees'],
            $data['contract_manager_signature'],
            $data['contract_manager_date'],
            $data['construction_pm_signature'],
            $data['construction_pm_date'],
            $data['department_head_signature'],
            $data['department_head_date'],
            $data['ceo_signature'],
            $data['ceo_date'],
            $data['priceIncludesVat'],
            $data['regist_user']
        ]);
        
        $handover_num = $pdo->lastInsertId();
        error_log("새 handover 레코드 생성됨: " . $handover_num);
        
    } else {
        // 기존 데이터 업데이트
        $sql = "UPDATE work_handover SET 
            workplacename = ?, firstord = ?, secondord = ?, completion_date = ?,
            contract_amount = ?, contract_items = ?, execution_status = ?, secondary_piping = ?,
            painting_caulking = ?, equipment_cost = ?, special_notes = ?, meeting_attendees = ?,
            contract_manager_signature = ?, contract_manager_date = ?,
            construction_pm_signature = ?, construction_pm_date = ?,
            department_head_signature = ?, department_head_date = ?,
            ceo_signature = ?, ceo_date = ?,
            priceIncludesVat = ?,
            update_day = NOW(), update_user = ?
            WHERE num = ? AND is_deleted = 'N'";
        
        $stmt = $pdo->prepare($sql);
        $stmt->execute([
            $data['workplacename'],
            $data['firstord'],
            $data['secondord'],
            $data['completion_date'],
            $data['contract_amount'],
            $data['contract_items'],
            $data['execution_status'],
            $data['secondary_piping'],
            $data['painting_caulking'],
            $data['equipment_cost'], 
            $data['special_notes'],
            $data['meeting_attendees'],
            $data['contract_manager_signature'],
            $data['contract_manager_date'],
            $data['construction_pm_signature'],
            $data['construction_pm_date'],
            $data['department_head_signature'],
            $data['department_head_date'],
            $data['ceo_signature'],
            $data['ceo_date'],
            $data['priceIncludesVat'],
            $data['regist_user'],
            $data['handover_num']
        ]);
        
        $handover_num = $data['handover_num'];
    }
    
    $pdo->commit(); 
    
    ob_clean();
    header('Content-Type: application/json');
    echo json_encode([
        'success' => true, 
        'message' => '저장되었습니다.',
        'handover_num' => $handover_num,
        'work_num' => $parentnum
    ]);
    
} catch (Exception $e) {
    if (isset($pdo) && $transactionStarted) {
        try {
            $pdo->rollBack(); 
            error_log("트랜잭션 롤백됨");
        } catch (PDOException $rollbackError) {
            error_log("롤백 오류: " . $rollbackError->getMessage());
        }
    }
    error_log("Handover save error: " . $e->getMessage());
    error_log("Stack trace: " . $e->getTraceAsString());
    
    // 더 자세한 에러 메시지 제공
    $errorMessage = $e->getMessage();
    if (strpos($errorMessage, 'foreign key constraint') !== false) {
        $errorMessage = 'work_num(' . ($data['work_num'] ?? 'null') . ')에 해당하는 작업이 존재하지 않습니다.';
    }
    
    ob_clean();
    header('Content-Type: application/json');
    echo json_encode([
        'success' => false, 
        'message' => $errorMessage,
        'debug_info' => [
            'work_num' => $data['work_num'] ?? 'null',
            'handover_num' => $data['handover_num'] ?? 'null',
            'transaction_started' => $transactionStarted
        ]
    ]);
} catch (Error $e) { 
    // PHP Fatal Error 처리
    if (isset($pdo) && $transactionStarted) {
        try {
            $pdo->rollBack();
            error_log("Fatal Error 후 트랜잭션 롤백됨");
        } catch (PDOException $rollbackError) {
            error_log("Fatal Error 롤백 오류: " . $rollbackError->getMessage());
        }
    }
    error_log("Handover Fatal Error: " . $e->getMessage());
    error_log("Stack trace: " . $e->getTraceAsString());
    
    ob_clean();
    header('Content-Type: application/json');
    echo json_encode([
        'success' => false, 
        'message' => 'PHP Fatal Error: ' . $e->getMessage()
    ]);
}
?>