<?php
/**
 * 工位字段配置辅助函数
 * 用于后台配置和前端动态渲染
 */

/**
 * 获取各工位类型的默认字段配置
 */
function getDefaultFieldsConfig($stationType) {
    $configs = [
        'inbound' => [
            ['name'=>'product_type','label'=>'类型','type'=>'select','source'=>'type_list','required'=>true,'enabled'=>true,'placeholder'=>'请选择类型','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'类型'],
            ['name'=>'product_model','label'=>'产品型号','type'=>'select','source'=>'product_models','required'=>true,'enabled'=>true,'placeholder'=>'请选择产品型号','col_width'=>2,'is_scan'=>false,'show_in_table'=>false,'table_label'=>'产品型号'],
            ['name'=>'serial_no','label'=>'产品序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描/输入后按回车','col_width'=>3,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'产品序列号'],
        ],
        'pcb_test' => [
            ['name'=>'product_type','label'=>'产品类型','type'=>'hidden','required'=>true,'enabled'=>true,'placeholder'=>'PCBA','col_width'=>0,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'产品类型','fixed_value'=>'PCBA'],
            ['name'=>'product_model','label'=>'产品型号','type'=>'select','source'=>'product_models','required'=>true,'enabled'=>true,'placeholder'=>'请选择产品型号','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'产品型号'],
            ['name'=>'static_power','label'=>'静态功耗','type'=>'number','required'=>false,'enabled'=>true,'placeholder'=>'0.0000','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'静态功耗'],
            ['name'=>'input_output','label'=>'输入输出','type'=>'text','required'=>false,'enabled'=>true,'placeholder'=>'正常/异常','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'输入输出'],
            ['name'=>'test_status','label'=>'测试状态','type'=>'select','source'=>'test_status_options','required'=>false,'enabled'=>true,'placeholder'=>'请选择','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'测试状态'],
            ['name'=>'serial_no','label'=>'PCBA序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描 PCBA 序列号后按回车','col_width'=>6,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'PCBA序列号'],
        ],
        'battery' => [
            ['name'=>'product_type','label'=>'类型','type'=>'hidden','required'=>true,'enabled'=>true,'placeholder'=>'电池','col_width'=>0,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'类型','fixed_value'=>'电池'],
            ['name'=>'product_model','label'=>'产品型号','type'=>'select','source'=>'product_models','required'=>true,'enabled'=>true,'placeholder'=>'请选择产品型号','col_width'=>3,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'产品型号'],
            ['name'=>'voltage_platform','label'=>'电压平台','type'=>'text','required'=>false,'enabled'=>true,'placeholder'=>'如：3.7V','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'电压平台'],
            ['name'=>'no_load_voltage','label'=>'空载电压','type'=>'number','required'=>false,'enabled'=>true,'placeholder'=>'0.0000','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'空载电压'],
            ['name'=>'internal_resistance','label'=>'电池内阻','type'=>'number','required'=>false,'enabled'=>true,'placeholder'=>'0.0000','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'电池内阻'],
            ['name'=>'serial_no','label'=>'产品序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描/输入后按回车','col_width'=>4,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'产品序列号'],
        ],
        'assembly' => [
            ['name'=>'product_model','label'=>'产品型号','type'=>'select','source'=>'product_models','required'=>true,'enabled'=>true,'placeholder'=>'请选择产品型号','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'产品型号'],
            ['name'=>'shell_color','label'=>'外壳颜色','type'=>'select','source'=>'shell_color_options','required'=>false,'enabled'=>true,'placeholder'=>'请选择外壳颜色','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'外壳颜色'],
            ['name'=>'finished_serial','label'=>'成品序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描成品序列号','col_width'=>3,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'成品序列号'],
            ['name'=>'battery_serial','label'=>'电池序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描电池序列号','col_width'=>3,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'电池序列号'],
            ['name'=>'pcb_serial','label'=>'PCB序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描PCB序列号','col_width'=>2,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'PCB序列号'],
        ],
        'finished_test' => [
            ['name'=>'product_model','label'=>'产品型号','type'=>'select','source'=>'product_models','required'=>false,'enabled'=>true,'placeholder'=>'请选择产品型号','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'产品型号'],
            ['name'=>'test_item','label'=>'测试项目','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'如：功能测试','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'测试项目'],
            ['name'=>'test_result','label'=>'测试结果','type'=>'select','source'=>'test_result_options','required'=>false,'enabled'=>true,'placeholder'=>'请选择','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'测试结果'],
            ['name'=>'test_steps','label'=>'测试步骤','type'=>'text','required'=>false,'enabled'=>true,'placeholder'=>'步骤描述','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'测试步骤'],
            ['name'=>'finished_serial','label'=>'成品序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描序列号后按回车','col_width'=>4,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'成品序列号'],
        ],
        'warehouse' => [
            ['name'=>'product_model','label'=>'产品型号','type'=>'select','source'=>'product_models','required'=>false,'enabled'=>true,'placeholder'=>'请选择产品型号','col_width'=>3,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'产品型号'],
            ['name'=>'finished_serial','label'=>'成品序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描成品序列号后按回车','col_width'=>4,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'成品序列号'],
            ['name'=>'box_serial','label'=>'箱序列号','type'=>'text','required'=>false,'enabled'=>true,'placeholder'=>'箱序列号','col_width'=>3,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'箱序列号'],
        ],
        'delivery' => [
            ['name'=>'customer_name','label'=>'客户名称','type'=>'select','source'=>'customers','required'=>true,'enabled'=>true,'placeholder'=>'请选择客户','col_width'=>3,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'客户名称'],
            ['name'=>'finished_serial','label'=>'成品/箱序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描序列号后按回车(自动识别型号)','col_width'=>4,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'序列号'],
            ['name'=>'product_model','label'=>'产品型号','type'=>'hidden','required'=>false,'enabled'=>true,'placeholder'=>'','col_width'=>0,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'产品型号'],
        ],
        'semi_finished' => [
            ['name'=>'product_type','label'=>'类型','type'=>'hidden','required'=>true,'enabled'=>true,'placeholder'=>'半成品','col_width'=>0,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'类型','fixed_value'=>'半成品'],
            ['name'=>'product_model','label'=>'产品型号','type'=>'select','source'=>'product_models','required'=>true,'enabled'=>true,'placeholder'=>'请选择产品型号','col_width'=>3,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'产品型号'],
            ['name'=>'serial_no','label'=>'产品序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描/输入后按回车','col_width'=>4,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'产品序列号'],
        ],
        'aging' => [
            ['name'=>'product_type','label'=>'类型','type'=>'hidden','required'=>true,'enabled'=>true,'placeholder'=>'半成品','col_width'=>0,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'类型','fixed_value'=>'半成品'],
            ['name'=>'product_model','label'=>'产品型号','type'=>'select','source'=>'product_models','required'=>true,'enabled'=>true,'placeholder'=>'请选择产品型号','col_width'=>3,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'产品型号'],
            ['name'=>'serial_no','label'=>'产品序列号','type'=>'text','required'=>true,'enabled'=>true,'placeholder'=>'扫描/输入后按回车','col_width'=>4,'is_scan'=>true,'show_in_table'=>true,'table_label'=>'产品序列号'],
            ['name'=>'aging_duration','label'=>'老化时长(h)','type'=>'number','required'=>false,'enabled'=>true,'placeholder'=>'如：24','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'老化时长'],
            ['name'=>'aging_temp','label'=>'老化温度(℃)','type'=>'number','required'=>false,'enabled'=>true,'placeholder'=>'如：85','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'老化温度'],
            ['name'=>'aging_result','label'=>'老化结果','type'=>'select','source'=>'test_result_options','required'=>false,'enabled'=>true,'placeholder'=>'请选择','col_width'=>2,'is_scan'=>false,'show_in_table'=>true,'table_label'=>'老化结果'],
        ],
    ];
    $fields = isset($configs[$stationType]) ? $configs[$stationType] : [];
    
    // ★ 关键修复：附加默认 _meta 信息
    // 当 workstation.fields_config 为空时，FrontController::getStationFieldConfig()
    // 会 fallback 到 getDefaultFieldsConfig()，但之前没有附加 _meta，
    // 导致 model_type_filter、type_filter 等元信息丢失。
    $meta = getDefaultMetaConfig($stationType);
    if (!empty($meta)) {
        $fields['_meta'] = $meta;
    }
    
    return $fields;
}

/**
 * 获取各工位类型的默认元信息配置
 * 当数据库 fields_config 为空时作为兜底
 */
function getDefaultMetaConfig($stationType) {
    $metas = [
        'inbound' => [
            'model_type_filter' => '半成品',
            'type_filter' => 'inbound',
        ],
        'pcb_test' => [
            'model_type_filter' => 'PCBA',
        ],
        'battery' => [
            'model_type_filter' => '电池',
        ],
        'assembly' => [
            'model_type_filter' => '成品',
            'extra_data_sources' => ['shellColors' => true],
        ],
        'finished_test' => [
            'model_type_filter' => '成品',
        ],
        'warehouse' => [
            'model_type_filter' => '成品',
        ],
        'delivery' => [],
        'semi_finished' => [
            'model_type_filter' => '半成品',
        ],
        'aging' => [
            'model_type_filter' => '半成品',
        ],
    ];
    return $metas[$stationType] ?? [];
}

/**
 * 解析工位字段配置
 * 返回数组，如果为空则使用默认配置
 * 
 * JSON 格式支持两种结构：
 * 1. 纯字段数组：[{name,label,...}, ...]  (旧格式，兼容)
 * 2. 元信息 + 字段：{"_meta":{...}, "fields":[{...}, ...]}  (新格式)
 * 
 * _meta 支持的字段：
 *   - model_type_filter: string 产品型号筛选类型（如 "成品"、"PCBA"、"电池"）
 *   - type_filter: string 类型列表筛选方式（如 "inbound"、"enabled"）
 *   - extra_data_sources: object 额外数据源配置
 */
function parseFieldsConfig($stationType, $fieldsConfigJson = '') {
    if (!empty($fieldsConfigJson)) {
        $config = json_decode($fieldsConfigJson, true);
        if (is_array($config) && !empty($config)) {
            // 新格式：{"_meta":{...}, "fields":[...]}
            if (isset($config['_meta']) || isset($config['fields'])) {
                $result = $config['fields'] ?? [];
                $meta = $config['_meta'] ?? [];
                // 用默认元信息补全缺失的 key（如 model_type_filter）
                $defaultMeta = getDefaultMetaConfig($stationType);
                if (!empty($defaultMeta)) {
                    foreach ($defaultMeta as $k => $v) {
                        if (!array_key_exists($k, $meta)) {
                            $meta[$k] = $v;
                        }
                    }
                }
                $result['_meta'] = $meta;
                return $result;
            }
            // 旧格式：纯字段数组 — 附加默认元信息
            $meta = getDefaultMetaConfig($stationType);
            if (!empty($meta)) {
                $config['_meta'] = $meta;
            }
            return $config;
        }
    }
    // 回退到默认配置，附加默认元信息
    $defaultFields = getDefaultFieldsConfig($stationType);
    $meta = getDefaultMetaConfig($stationType);
    if (!empty($meta)) {
        $defaultFields['_meta'] = $meta;
    }
    return $defaultFields;
}

/**
 * 渲染前端表单输入字段 (根据配置动态生成)
 * $fieldConfigs: 解析后的字段配置数组
 * $dataSources: ['types' => [], 'models' => [], 'customers' => []]
 * $isReadonly: 操作人显示名称
 */
function renderStationFields($fieldConfigs, $dataSources = [], $operatorName = '', $excludeFields = []) {
    $html = '';
    $enabledFields = array_filter($fieldConfigs, function($f) { return !empty($f['enabled']); });
    
    // 排除指定字段
    if (!empty($excludeFields)) {
        $enabledFields = array_filter($enabledFields, function($f) use ($excludeFields) {
            return !in_array($f['name'], $excludeFields);
        });
    }
    
    // 分组：扫描字段和其他字段
    $scanFields = array_filter($enabledFields, function($f) { return !empty($f['is_scan']); });
    $normalFields = array_filter($enabledFields, function($f) { return empty($f['is_scan']); });
    
    // 输出所有非扫描字段 + 操作人（CSS Grid 自适应布局）
    $html .= '<div class="station-fields-grid" id="stationFieldsGrid">';
    
    foreach ($normalFields as $field) {
        $html .= '<div class="station-field-item">';
        $html .= renderSingleField($field, $dataSources);
        $html .= '</div>';
    }
    
    // 操作人（固定显示）
    if ($operatorName) {
        $html .= '<div class="station-field-item">';
        $html .= '<label>操作人</label>';
        $html .= '<input type="text" class="form-control" value="' . htmlspecialchars($operatorName) . '" disabled>';
        $html .= '</div>';
    }
    
    $html .= '</div>';
    
    // 扫描字段（序列号类）- 单独一行，宽度自适应
    if (!empty($scanFields)) {
        $html .= '<div class="station-scan-grid" style="margin-top:15px;">';
        foreach ($scanFields as $field) {
            $html .= '<div class="station-field-item station-scan-item">';
            $html .= renderSingleField($field, $dataSources, true);
            $html .= '</div>';
        }
        $html .= '</div>';
    }
    
    return $html;
}

/**
 * 渲染单个字段
 */
function renderSingleField($field, $dataSources = [], $isScan = false) {
    $name = htmlspecialchars($field['name']);
    $label = htmlspecialchars($field['label']);
    $type = $field['type'] ?? 'text';
    $required = !empty($field['required']) ? 'required' : '';
    $placeholder = htmlspecialchars($field['placeholder'] ?? '');
    $html = '';
    
    // hidden 类型：只输出隐藏域，不显示标签
    if ($type === 'hidden') {
        $fixedValue = htmlspecialchars($field['fixed_value'] ?? '');
        $html = '<input type="hidden" name="' . $name . '" value="' . $fixedValue . '">';
        return $html;
    }
    
    $html .= '<label>' . $label;
    if ($required) $html .= ' <span class="text-danger">*</span>';
    if ($isScan) $html .= ' <small class="text-muted">(回车添加)</small>';
    $html .= '</label>';
    
    if ($type === 'select') {
        $source = $field['source'] ?? '';
        $cssClass = $isScan ? 'form-control scan-submit' : 'form-control sticky-save';
        $html .= '<select name="' . $name . '" class="' . $cssClass . '" ' . $required . '>';
        $html .= '<option value="">' . $placeholder . '</option>';
        
        if ($source === 'type_list' && isset($dataSources['types'])) {
            // 去重（防止重复的类型名称）
            $seen = [];
            foreach ($dataSources['types'] as $type) {
                // 兼容多种数据源格式：
                //   - product_type_config 表：type_name 列
                //   - ProductModel.getTypes()：type 列
                //   - ProductModel.getProductTypes()：product_type 列
                $val = htmlspecialchars($type['type_name'] ?? $type['type'] ?? $type['product_type'] ?? '');
                if ($val === '' || isset($seen[$val])) continue;
                $seen[$val] = true;
                $html .= '<option value="' . $val . '">' . $val . '</option>';
            }
        } elseif ($source === 'product_types' && isset($dataSources['types'])) {
            $seen = [];
            foreach ($dataSources['types'] as $type) {
                $val = htmlspecialchars($type['product_type'] ?? '');
                if ($val === '' || isset($seen[$val])) continue;
                $seen[$val] = true;
                $html .= '<option value="' . $val . '">' . $val . '</option>';
            }
        } elseif ($source === 'product_models' && isset($dataSources['models'])) {
            if (empty($dataSources['models'])) {
                // 没有传入型号列表时，显示提示（由前端联动动态加载）
                $html .= '<option value="">请先选择产品类型</option>';
            } else {
                foreach ($dataSources['models'] as $model) {
                    $val = htmlspecialchars($model['model_code']);
                    $html .= '<option value="' . $val . '">' . $val . '</option>';
                }
            }
        } elseif ($source === 'customers' && isset($dataSources['customers'])) {
            foreach ($dataSources['customers'] as $cust) {
                $val = htmlspecialchars($cust['company_name'] ?? '');
                $html .= '<option value="' . $val . '">' . $val . '</option>';
            }
        } elseif ($source === 'test_status_options') {
            $html .= '<option value="pending">待测试</option>';
            $html .= '<option value="passed">通过</option>';
            $html .= '<option value="failed">失败</option>';
        } elseif ($source === 'test_result_options') {
            $html .= '<option value="通过">通过</option>';
            $html .= '<option value="失败">失败</option>';
            $html .= '<option value="未测试">未测试</option>';
        } elseif ($source === 'shell_color_options') {
            if (isset($dataSources['shell_colors']) && !empty($dataSources['shell_colors'])) {
                foreach ($dataSources['shell_colors'] as $color) {
                    $val = htmlspecialchars($color['model_code']);
                    $html .= '<option value="' . $val . '">' . $val . '</option>';
                }
            } else {
                $html .= '<option value="">暂无外壳颜色数据</option>';
            }
        }
        $html .= '</select>';
    } elseif ($type === 'number') {
        $cssClass = $isScan ? 'form-control scan-submit' : 'form-control sticky-save';
        $html .= '<input type="number" step="any" name="' . $name . '" class="' . $cssClass . '" placeholder="' . $placeholder . '" ' . $required . '>';
    } elseif ($type === 'textarea') {
        $html .= '<textarea name="' . $name . '" class="form-control sticky-save" placeholder="' . $placeholder . '" rows="2" ' . $required . '></textarea>';
    } else {
        // text 类型
        $cssClass = $isScan ? 'form-control scan-submit' : 'form-control sticky-save';
        $autofocus = $isScan ? ' autofocus' : '';
        $html .= '<input type="text" name="' . $name . '" class="' . $cssClass . '" placeholder="' . $placeholder . '" ' . $required . $autofocus . '>';
    }
    
    return $html;
}

/**
 * 渲染记录表格表头
 */
function renderRecordTableHeader($fieldConfigs) {
    $html = '<th data-col="seq">序号</th>';
    $colIdx = 0;
    foreach ($fieldConfigs as $field) {
        if (!empty($field['enabled']) && !empty($field['show_in_table'])) {
            $colKey = htmlspecialchars($field['name']);
            $html .= '<th data-col="' . $colKey . '">' . htmlspecialchars($field['table_label'] ?? $field['label']) . '</th>';
            $colIdx++;
        }
    }
    $html .= '<th data-col="operator">操作人</th><th data-col="time">时间</th>';
    return $html;
}

/**
 * 渲染记录表格数据行
 */
function renderRecordTableRow($record, $fieldConfigs, $specialFormats = []) {
    $html = '<tr>';
    $html .= '<td data-col="seq">' . $record['id'] . '</td>';
    
    foreach ($fieldConfigs as $field) {
        if (empty($field['enabled']) || empty($field['show_in_table'])) continue;
        $name = $field['name'];
        $val = $record[$name] ?? '';
        $colKey = htmlspecialchars($name);
        
        if (isset($specialFormats[$name])) {
            $html .= '<td data-col="' . $colKey . '">' . $specialFormats[$name]($val, $record) . '</td>';
        } else {
            $html .= '<td data-col="' . $colKey . '">' . htmlspecialchars($val) . '</td>';
        }
    }
    
    $html .= '<td data-col="operator">' . htmlspecialchars($record['operator'] ?? '') . '</td>';
    // 兼容各种时间列名：created_at, create_time, assembly_time, test_time, delivery_time, in_time
    $timeValue = $record['created_at'] 
        ?? $record['create_time'] 
        ?? $record['assembly_time'] 
        ?? $record['test_time'] 
        ?? $record['delivery_time'] 
        ?? $record['in_time'] 
        ?? '';
    $html .= '<td data-col="time">' . htmlspecialchars($timeValue) . '</td>';
    $html .= '</tr>';
    return $html;
}

/**
 * 渲染表格列选择器（下拉多选按钮）
 * @param string $pageKey 页面唯一标识，用于 localStorage 区分不同页面
 * @param array  $fieldConfigs 字段配置数组
 * @return string HTML
 */
function renderTableColumnSelector($pageKey, $fieldConfigs) {
    $cols = [['key' => 'seq', 'label' => '序号']];
    foreach ($fieldConfigs as $field) {
        if (!empty($field['enabled']) && !empty($field['show_in_table'])) {
            $cols[] = [
                'key'  => $field['name'],
                'label'=> $field['table_label'] ?? $field['label'],
            ];
        }
    }
    $cols[] = ['key' => 'operator', 'label' => '操作人'];
    $cols[] = ['key' => 'time', 'label' => '时间'];

    $colsJson = json_encode($cols, JSON_UNESCAPED_UNICODE);
    $pageKeyJson = json_encode($pageKey);

    $html = '<span class="table-column-selector" title="选择显示列" style="margin-left:8px;">';
    $html .= '<button type="button" class="col-btn col-btn-dropdown" id="colSelectBtn_' . htmlspecialchars($pageKey) . '">';
    $html .= '<i class="fa fa-columns"></i> 列选择 <i class="fa fa-caret-down"></i>';
    $html .= '</button>';
    $html .= '<div class="col-dropdown-panel" id="colDropdown_' . htmlspecialchars($pageKey) . '" style="display:none;">';
    $html .= '<div class="col-dropdown-header">';
    $html .= '<label><input type="checkbox" class="col-check-all" checked> 全选</label>';
    $html .= '<button type="button" class="col-reset-btn" title="恢复默认"><i class="fa fa-refresh"></i></button>';
    $html .= '</div>';
    $html .= '<div class="col-dropdown-list">';
    foreach ($cols as $col) {
        $html .= '<label><input type="checkbox" class="col-check-item" data-col="' . htmlspecialchars($col['key']) . '" checked> '
              . htmlspecialchars($col['label']) . '</label>';
    }
    $html .= '</div>';
    $html .= '</div>';
    $html .= '</span>';

    // 内联初始化脚本（在元素渲染后立即执行）
    $html .= '<script nonce="' . csp_nonce() . '">window._colSelectorQueue = window._colSelectorQueue || [];';
    $html .= 'window._colSelectorQueue.push({pageKey:' . $pageKeyJson . ',cols:' . $colsJson . '});</script>';

    return $html;
}

/**
 * 生成字段配置编辑UI的JSON字符串（供JS使用）
 */
function renderFieldConfigEditor($stationType, $fieldsConfigJson = '', $stationDefinition = null) {
    $rawConfig = parseFieldsConfig($stationType, $fieldsConfigJson);
    // 分离 _meta 和 fields
    $meta = $rawConfig['_meta'] ?? [];
    $fields = $rawConfig;
    unset($fields['_meta']);
    $fields = array_values($fields);
    
    $fieldsJson = json_encode($fields, JSON_UNESCAPED_UNICODE);
    $metaJson = json_encode($meta, JSON_UNESCAPED_UNICODE);
    $stationTypeJson = json_encode($stationType);
    
    // 工位定义元数据（用于数据表结构管控）
    $stationDef = $stationDefinition ?: [];
    $hasProductType = !empty($stationDef['has_product_type']);
    $hasProductModel = !empty($stationDef['has_product_model']);
    $filterEnabled = !empty($stationDef['filter_enabled']);
    $showTodayCount = !empty($stationDef['show_today_count']);
    $showTotalCount = !empty($stationDef['show_total_count']);
    $defId = $stationDef['id'] ?? 0;
    
    // 产品类型选项（用于型号筛选下拉）
    $productTypeOptions = json_encode(['', '半成品', '成品', 'PCBA', '电池', '外壳', '外壳颜色'], JSON_UNESCAPED_UNICODE);
    
    ob_start();
    ?>
    <div id="fieldConfigEditor" style="margin-top:15px; border-top:1px solid #eee; padding-top:15px;">
        <h4><i class="fa fa-cog"></i> 输入数据项配置 
            <button type="button" class="btn btn-xs btn-success" id="addFieldBtn"><i class="fa fa-plus"></i> 添加字段</button>
            <button type="button" class="btn btn-xs btn-warning" id="resetDefaultsBtn"><i class="fa fa-refresh"></i> 恢复默认</button>
        </h4>
        
        <!-- 工位定义元数据配置区（管控数据表结构） -->
        <div class="panel panel-default" style="margin-bottom:15px;">
            <div class="panel-heading"><i class="fa fa-database"></i> 数据表结构管控
                <?php if ($defId): ?><span class="pull-right text-muted" style="font-size:12px;">工位定义 ID: <?php echo $defId; ?></span><?php endif; ?>
            </div>
            <div class="panel-body">
                <div class="row">
                    <div class="col-md-4">
                        <label>
                            <input type="checkbox" name="sd_has_product_type" value="1" <?php echo $hasProductType ? 'checked' : ''; ?>>
                            数据表含 product_type 列
                        </label>
                        <br><small class="text-muted">记录可按产品类型筛选</small>
                    </div>
                    <div class="col-md-4">
                        <label>
                            <input type="checkbox" name="sd_has_product_model" value="1" <?php echo $hasProductModel ? 'checked' : ''; ?>>
                            数据表含 product_model 列
                        </label>
                        <br><small class="text-muted">记录可按产品型号筛选</small>
                    </div>
                    <div class="col-md-4">
                        <label>
                            <input type="checkbox" name="sd_filter_enabled" value="1" <?php echo $filterEnabled ? 'checked' : ''; ?>>
                            启用前端筛选
                        </label>
                        <br><small class="text-muted">前端显示类型/型号筛选联动</small>
                    </div>
                </div>
                <div class="row" style="margin-top:10px;">
                    <div class="col-md-4">
                        <label>
                            <input type="checkbox" name="sd_show_today_count" value="1" <?php echo $showTodayCount ? 'checked' : ''; ?>>
                            显示今日录入计数
                        </label>
                    </div>
                    <div class="col-md-4">
                        <label>
                            <input type="checkbox" name="sd_show_total_count" value="1" <?php echo $showTotalCount ? 'checked' : ''; ?>>
                            显示总记录计数
                        </label>
                    </div>
                </div>
            </div>
        </div>
        
        <!-- 元信息配置区 -->
        <div class="panel panel-default" style="margin-bottom:15px;">
            <div class="panel-heading"><i class="fa fa-sliders"></i> 数据筛选设置</div>
            <div class="panel-body">
                <div class="row">
                    <div class="col-md-4">
                        <label>产品型号筛选类型
                            <select class="form-control input-sm" id="metaModelTypeFilter">
                                <option value="">不限（显示全部型号）</option>
                            </select>
                        </label>
                        <small class="text-muted">选择后产品型号下拉只显示该类型</small>
                    </div>
                    <div class="col-md-4">
                        <label>类型列表筛选方式
                            <select class="form-control input-sm" id="metaTypeFilter">
                                <option value="">默认（所有启用的类型）</option>
                                <option value="inbound">入库可见类型</option>
                                <option value="enabled">已启用类型</option>
                            </select>
                        </label>
                        <small class="text-muted">控制"类型"下拉框显示哪些选项</small>
                    </div>
                    <div class="col-md-4">
                        <label>
                            <input type="checkbox" id="metaShellColors">
                            启用外壳颜色数据源
                        </label>
                        <br><small class="text-muted">组装工位使用，加载外壳颜色选项</small>
                    </div>
                </div>
            </div>
        </div>
        
        <!-- 序列号前缀映射区 -->
        <div class="panel panel-default" style="margin-bottom:15px;">
            <div class="panel-heading"><i class="fa fa-shield"></i> 序列号前缀规则（防错）
                <span class="pull-right text-muted" style="font-size:12px;">在 <a href="<?php echo BASE_URL; ?>/Admin/sysConfig" target="_blank">系统配置 → 序列号前缀规则</a> 中管理前缀</span>
            </div>
            <div class="panel-body">
                <p class="text-muted" style="margin-bottom:10px;">
                    <i class="fa fa-info-circle"></i> 
                    为扫描字段（is_scan=true）指定对应的产品类型，提交时将自动验证序列号前缀是否正确。<br>
                    选择「动态匹配」则根据提交时选择的 product_type 自动匹配前缀。
                </p>
                <div id="prefixFieldMapArea" style="max-height:200px; overflow-y:auto;">
                    <table class="table table-condensed table-bordered" style="margin-bottom:0;">
                        <thead>
                            <tr>
                                <th style="width:30%">扫描字段</th>
                                <th style="width:40%">对应产品类型</th>
                                <th style="width:30%">预期前缀</th>
                            </tr>
                        </thead>
                        <tbody id="prefixFieldMapTbody">
                        </tbody>
                    </table>
                </div>
                <small class="text-muted" style="display:block;margin-top:5px;">
                    提示：留空则自动从工位的 product_type 字段推断（如有 hidden 类型的 product_type 则使用其 fixed_value，否则动态匹配）
                </small>
            </div>
        </div>
        
        <div class="table-responsive">
            <table class="table table-bordered table-hover" id="fieldsTable" style="margin-bottom:0;">
                <thead>
                    <tr>
                        <th style="width:3%">启用</th>
                        <th style="width:10%">字段名</th>
                        <th style="width:10%">显示标签</th>
                        <th style="width:8%">类型</th>
                        <th style="width:10%">数据源</th>
                        <th style="width:4%">必填</th>
                        <th style="width:4%">唯一</th>
                        <th style="width:10%">占位提示</th>
                        <th style="width:5%">列宽</th>
                        <th style="width:5%">扫码</th>
                        <th style="width:5%">表中</th>
                        <th style="width:10%">表头标签</th>
                        <th style="width:5%">操作</th>
                    </tr>
                </thead>
                <tbody id="fieldsTbody"></tbody>
            </table>
        </div>
        <input type="hidden" name="fields_config" id="fieldsConfigInput" value="">
        <small class="text-muted"><i class="fa fa-info-circle"></i> 勾选「扫码」的字段会以扫码枪回车提交方式处理。勾选「表中」会在记录表格中显示该列。</small>
    </div>
    
    <script nonce="<?php echo csp_nonce(); ?>">
    var stationType = <?php echo $stationTypeJson; ?>;
    var defaultFields = <?php echo $fieldsJson; ?>;
    var currentFields = JSON.parse(JSON.stringify(defaultFields));
    var currentMeta = <?php echo $metaJson; ?>;
    var productTypeOptions = <?php echo $productTypeOptions; ?>;
    
    var fieldTypes = [
        {v:'text',n:'文本'},
        {v:'number',n:'数字'},
        {v:'select',n:'下拉选择'},
        {v:'textarea',n:'多行文本'}
    ];
    var fieldSources = [
        {v:'',n:'无(手动输入)'},
        {v:'product_types',n:'产品类型列表'},
        {v:'product_models',n:'产品型号列表'},
        {v:'customers',n:'客户列表'},
        {v:'test_status_options',n:'测试状态(待测/通过/失败)'},
        {v:'test_result_options',n:'测试结果(通过/失败/未测试)'},
        {v:'shell_color_options',n:'外壳颜色选项'}
    ];
    
    // 初始化元信息下拉框
    function initMetaUI() {
        var sel = document.getElementById('metaModelTypeFilter');
        sel.innerHTML = '<option value="">不限（显示全部型号）</option>';
        productTypeOptions.forEach(function(t) {
            if (!t) return;
            sel.innerHTML += '<option value="' + t + '"' + (currentMeta.model_type_filter === t ? ' selected' : '') + '>' + t + '</option>';
        });
        document.getElementById('metaTypeFilter').value = currentMeta.type_filter || '';
        document.getElementById('metaShellColors').checked = !!(currentMeta.extra_data_sources && currentMeta.extra_data_sources.shellColors);
        // 渲染前缀映射表
        renderPrefixFieldMap();
    }
    
    // ===== 前缀字段映射渲染 =====
    // 从 currentMeta.prefix_field_map 读取映射，为每个 is_scan 的 text 字段渲染一行
    function renderPrefixFieldMap() {
        var tbody = document.getElementById('prefixFieldMapTbody');
        if (!tbody) return;
        var prefixMap = currentMeta.prefix_field_map || {};
        // 用已知前缀规则展示预期前缀预览
        var knownPrefixes = {};
        try {
            // productTypeOptions 中包含产品类型列表，前缀从服务器端已知规则获取
            // 这里只做展示，实际规则由后端 SysConfig 动态读取
        } catch(e) {}
        
        var html = '';
        currentFields.forEach(function(f, i) {
            if (!f.enabled || !f.is_scan || f.type !== 'text') return;
            var fieldName = f.name || '';
            if (!fieldName) return;
            var currentVal = prefixMap[fieldName] || '';
            var label = f.label || fieldName;
            
            // 构建产品类型下拉选项
            var typeOpts = '<option value="">（自动推断）</option>';
            typeOpts += '<option value="*dynamic*"' + (currentVal === '*dynamic*' ? ' selected' : '') + '>动态匹配（根据 product_type）</option>';
            productTypeOptions.forEach(function(t) {
                if (!t) return;
                typeOpts += '<option value="' + t + '"' + (currentVal === t ? ' selected' : '') + '>' + t + '</option>';
            });
            
            html += '<tr>';
            html += '<td><strong>' + escHtml(label) + '</strong><br><small class="text-muted">' + escHtml(fieldName) + '</small></td>';
            html += '<td><select class="form-control input-sm" data-prefix-field="' + escHtml(fieldName) + '" style="min-width:160px;">' + typeOpts + '</select></td>';
            html += '<td><span class="text-muted" style="font-size:12px;">' + (currentVal && currentVal !== '*dynamic*' ? '系统配置中定义' : currentVal === '*dynamic*' ? '运行时动态匹配' : '自动推断') + '</span></td>';
            html += '</tr>';
        });
        
        if (html === '') {
            html = '<tr><td colspan="3" class="text-muted" style="text-align:center;padding:20px;">暂无扫描字段。勾选字段的「扫码」选项后，此处将显示前缀映射配置。</td></tr>';
        }
        tbody.innerHTML = html;
    }
    
    function updatePrefixMap(fieldName, productType) {
        if (!currentMeta.prefix_field_map) currentMeta.prefix_field_map = {};
        if (productType) {
            currentMeta.prefix_field_map[fieldName] = productType;
        } else {
            delete currentMeta.prefix_field_map[fieldName];
        }
        updateFieldsConfig();
        // 刷新前缀列显示
        renderPrefixFieldMap();
    }
    
    // 更新隐藏域值（新格式：{"_meta":{...}, "fields":[...]}）
    function updateFieldsConfig() {
        var config = {_meta: currentMeta, fields: currentFields};
        document.getElementById('fieldsConfigInput').value = JSON.stringify(config);
    }
    
    function resetDefaults() {
        if (confirm('确定恢复为默认配置吗？当前配置将丢失。')) {
            currentFields = JSON.parse(JSON.stringify(defaultFields));
            currentMeta = {};
            initMetaUI();
            renderFieldsTable();
            renderPrefixFieldMap();
            updateFieldsConfig();
        }
    }
    
    function addField() {
        currentFields.push({
            name: '', label: '', type: 'text', source: '', required: false, unique: false,
            enabled: true, placeholder: '', col_width: 2, is_scan: false,
            show_in_table: true, table_label: ''
        });
        renderFieldsTable();
    }
    
    function removeField(idx) {
        if (confirm('确定删除这个字段吗？')) {
            currentFields = currentFields.filter(function(_, i) { return i !== idx; });
            renderFieldsTable();
        }
    }
    
    function moveField(idx, dir) {
        var newIdx = idx + dir;
        if (newIdx < 0 || newIdx >= currentFields.length) return;
        var tmp = currentFields[idx];
        currentFields[idx] = currentFields[newIdx];
        currentFields[newIdx] = tmp;
        renderFieldsTable();
    }
    
    function renderFieldsTable() {
        var tbody = document.getElementById('fieldsTbody');
        var html = '';
        currentFields.forEach(function(f, i) {
            var typeOpts = fieldTypes.map(function(t) {
                return '<option value="' + t.v + '"' + (f.type === t.v ? ' selected' : '') + '>' + t.n + '</option>';
            }).join('');
            var sourceOpts = fieldSources.map(function(s) {
                return '<option value="' + s.v + '"' + ((f.source||'') === s.v ? ' selected' : '') + '>' + s.n + '</option>';
            }).join('');
            html += '<tr>';
            html += '<td style="text-align:center"><input type="checkbox" data-idx="'+i+'" data-prop="enabled" ' + (f.enabled !== false ? 'checked' : '') + '></td>';
            html += '<td><input type="text" class="form-control input-sm" value="' + escHtml(f.name) + '" data-idx="'+i+'" data-prop="name" placeholder="字段名" style="min-width:90px;"></td>';
            html += '<td><input type="text" class="form-control input-sm" value="' + escHtml(f.label) + '" data-idx="'+i+'" data-prop="label" placeholder="标签" style="min-width:90px;"></td>';
            html += '<td><select class="form-control input-sm" data-idx="'+i+'" data-prop="type">' + typeOpts + '</select></td>';
            html += '<td><select class="form-control input-sm" data-idx="'+i+'" data-prop="source">' + sourceOpts + '</select></td>';
            html += '<td style="text-align:center"><input type="checkbox" data-idx="'+i+'" data-prop="required" ' + (f.required ? 'checked' : '') + '></td>';
            html += '<td style="text-align:center"><input type="checkbox" data-idx="'+i+'" data-prop="unique" title="不允许重复录入" ' + (f.unique ? 'checked' : '') + '></td>';
            html += '<td><input type="text" class="form-control input-sm" value="' + escHtml(f.placeholder) + '" data-idx="'+i+'" data-prop="placeholder" placeholder="提示" style="min-width:90px;"></td>';
            html += '<td><input type="number" class="form-control input-sm" value="' + (f.col_width||2) + '" min="1" max="12" data-idx="'+i+'" data-prop="col_width" style="width:55px;"></td>';
            html += '<td style="text-align:center"><input type="checkbox" data-idx="'+i+'" data-prop="is_scan" ' + (f.is_scan ? 'checked' : '') + '></td>';
            html += '<td style="text-align:center"><input type="checkbox" data-idx="'+i+'" data-prop="show_in_table" ' + (f.show_in_table !== false ? 'checked' : '') + '></td>';
            html += '<td><input type="text" class="form-control input-sm" value="' + escHtml(f.table_label||'') + '" data-idx="'+i+'" data-prop="table_label" placeholder="表头" style="min-width:90px;"></td>';
            html += '<td style="text-align:center;white-space:nowrap">';
            html += '<button type="button" class="btn btn-xs btn-default" data-idx="'+i+'" data-faction="moveUp" title="上移"><i class="fa fa-arrow-up"></i></button> ';
            html += '<button type="button" class="btn btn-xs btn-default" data-idx="'+i+'" data-faction="moveDown" title="下移"><i class="fa fa-arrow-down"></i></button> ';
            html += '<button type="button" class="btn btn-xs btn-danger" data-idx="'+i+'" data-faction="remove" title="删除"><i class="fa fa-trash"></i></button>';
            html += '</td>';
            html += '</tr>';
        });
        tbody.innerHTML = html;
        updateFieldsConfig();
    }
    
    function escHtml(s) { return (s||'').replace(/&/g,'&amp;').replace(/"/g,'&quot;').replace(/</g,'&lt;').replace(/>/g,'&gt;'); }
    
    // ===== CSP 事件绑定（替代内联 onclick/onchange 处理器）=====
    function bindFieldConfigEvents() {
        // 顶部操作按钮
        var addBtn = document.getElementById('addFieldBtn');
        if (addBtn) addBtn.addEventListener('click', addField);
        var resetBtn = document.getElementById('resetDefaultsBtn');
        if (resetBtn) resetBtn.addEventListener('click', resetDefaults);

        // 元信息筛选控件
        var mmf = document.getElementById('metaModelTypeFilter');
        if (mmf) mmf.addEventListener('change', function () {
            currentMeta.model_type_filter = this.value; updateFieldsConfig();
        });
        var mtf = document.getElementById('metaTypeFilter');
        if (mtf) mtf.addEventListener('change', function () {
            currentMeta.type_filter = this.value; updateFieldsConfig();
        });
        var msc = document.getElementById('metaShellColors');
        if (msc) msc.addEventListener('change', function () {
            currentMeta.extra_data_sources = currentMeta.extra_data_sources || {};
            currentMeta.extra_data_sources.shellColors = this.checked;
            updateFieldsConfig();
        });

        // 字段表格：事件委托（绑定在稳定的 tbody 上，innerHTML 重渲染后依然有效）
        var tbody = document.getElementById('fieldsTbody');
        if (tbody) {
            tbody.addEventListener('change', function (e) {
                var el = e.target;
                var idxAttr = el.getAttribute && el.getAttribute('data-idx');
                var prop = el.getAttribute && el.getAttribute('data-prop');
                if (idxAttr === null || idxAttr === undefined || !prop) return;
                var idx = parseInt(idxAttr, 10);
                var f = currentFields[idx];
                if (!f) return;
                if (el.type === 'checkbox') {
                    f[prop] = el.checked;
                } else if (prop === 'col_width') {
                    f[prop] = parseInt(el.value, 10) || 2;
                } else {
                    f[prop] = el.value;
                }
                updateFieldsConfig();
                if (prop === 'type') renderFieldsTable();
                if (prop === 'is_scan') renderPrefixFieldMap();
            });
            tbody.addEventListener('click', function (e) {
                var btn = e.target.closest ? e.target.closest('button[data-faction]') : null;
                if (!btn) return;
                var idx = parseInt(btn.getAttribute('data-idx'), 10);
                var action = btn.getAttribute('data-faction');
                if (action === 'moveUp') moveField(idx, -1);
                else if (action === 'moveDown') moveField(idx, 1);
                else if (action === 'remove') removeField(idx);
            });
        }

        // 前缀映射表：事件委托
        var prefixTbody = document.getElementById('prefixFieldMapTbody');
        if (prefixTbody) {
            prefixTbody.addEventListener('change', function (e) {
                var el = e.target;
                var fieldName = el.getAttribute && el.getAttribute('data-prefix-field');
                if (!fieldName) return;
                updatePrefixMap(fieldName, el.value);
            });
        }
    }

    // 表单提交前更新隐藏域
    document.addEventListener('DOMContentLoaded', function() {
        initMetaUI();
        renderFieldsTable();
        bindFieldConfigEvents();
        var form = document.querySelector('form[method="post"]');
        if (form) {
            form.addEventListener('submit', function() {
                updateFieldsConfig();
            });
        }
    });
    </script>
    <?php
    return ob_get_clean();
}

/**
 * 生成扫描字段连环回车 JS 代码
 * 
 * 行为：
 * - 扫描字段按 Enter → 自动填入扫码值 → 焦点跳到下一个空扫描字段
 * - 所有扫描字段填满后按 Enter → 触发提交
 * - 非扫描字段按 Enter → 焦点自然跳下一个输入框（tabindex 顺序）
 * 
 * @param string $formSelector 表单选择器，默认 '#mainForm'
 * @param string $submitSelector 提交按钮选择器（可选），留空则直接 submit 表单
 * @param bool   $clearAfterSubmit 提交后是否清空扫描字段（默认true）
 */
function renderScanChainJS($formSelector = '#mainForm', $submitSelector = '', $clearAfterSubmit = true) {
    ob_start();
    ?>
    function initScanChain() {
        var $form = $('<?php echo $formSelector; ?>');
        if (!$form.length) return;
        
        // 找到表单内所有输入元素（按DOM顺序）
        function getInputsInOrder() {
            var inputs = [];
            $form.find('input:not([disabled]):not([type="hidden"]):not(:submit):not(:button), select:not([disabled]), textarea:not([disabled])').each(function() {
                var $el = $(this);
                if ($el.closest('#fieldConfigEditor').length) return; // 跳过配置编辑器
                inputs.push(this);
            });
            // 按tabindex排序（如果有的话），否则按DOM顺序
            inputs.sort(function(a, b) {
                var ta = parseInt($(a).attr('tabindex')) || 0;
                var tb = parseInt($(b).attr('tabindex')) || 0;
                if (ta && tb) return ta - tb;
                if (ta) return -1;
                if (tb) return 1;
                return 0;
            });
            return inputs;
        }
        
        // 检查是否所有扫描字段都已填值
        function allScanFieldsFilled() {
            var allFilled = true;
            $form.find('.scan-submit').each(function() {
                if ($(this).val().trim() === '') allFilled = false;
            });
            return allFilled;
        }
        
        function doSubmit() {
            <?php if ($submitSelector): ?>
            $('<?php echo $submitSelector; ?>').click();
            <?php else: ?>
            $form.submit();
            <?php endif; ?>
        }
        
        // 回车事件：扫描字段 → 跳到下一个空位；最后一位 → 提交
        $form.on('keypress', '.scan-submit', function(e) {
            if (e.which !== 13) return;
            e.preventDefault();
            var $this = $(this);
            var val = $this.val().trim();
            
            if (val === '') return; // 空值不处理
            
            // 找到所有扫描字段
            var scanInputs = [];
            $form.find('.scan-submit').each(function() { scanInputs.push(this); });
            
            // 如果所有扫描字段都填满了 → 提交
            if (allScanFieldsFilled()) {
                doSubmit();
                return;
            }
            
            // 找到下一个空的扫描字段
            var found = false;
            for (var i = 0; i < scanInputs.length; i++) {
                if (scanInputs[i] === this) {
                    // 从当前之后找第一个空的
                    for (var j = 1; j < scanInputs.length; j++) {
                        var idx = (i + j) % scanInputs.length;
                        if ($(scanInputs[idx]).val().trim() === '') {
                            $(scanInputs[idx]).focus().select();
                            found = true;
                            break;
                        }
                    }
                    break;
                }
            }
            if (!found) {
                // 没找到空的，提交
                doSubmit();
            }
        });
        
        // 非扫描字段的回车 → 跳到下一个输入框
        $form.on('keypress', 'input:not(.scan-submit):not([type="hidden"]):not(:submit):not(:button), select, textarea', function(e) {
            if (e.which !== 13) return;
            var $el = $(this);
            if ($el.closest('#fieldConfigEditor').length) return;
            
            e.preventDefault();
            var inputs = getInputsInOrder();
            var idx = inputs.indexOf(this);
            if (idx >= 0 && idx < inputs.length - 1) {
                $(inputs[idx + 1]).focus().select();
            }
        });
        
        // 提交后清空扫描字段（重新聚焦第一个）
        $form.on('submit', function() {
            <?php if ($clearAfterSubmit): ?>
            setTimeout(function() {
                var $firstScan = $form.find('.scan-submit').first();
                if ($firstScan.length) $firstScan.focus();
            }, 100);
            <?php endif; ?>
        });
    }
    
    $(function() { initScanChain(); });
    <?php
    return ob_get_clean();
}