<?php
/**
 * 病例回访提醒系统 - 独立版本
 * 不依赖 Laravel 框架，直接使用 SQLite 数据库
 */

// 设置时区
date_default_timezone_set('Asia/Shanghai');

// 数据库连接
$dbPath = __DIR__ . '/../database/reminder.sqlite';
$dbDir = dirname($dbPath);

if (!file_exists($dbDir)) {
    mkdir($dbDir, 0755, true);
}

try {
    $db = new PDO('sqlite:' . $dbPath);
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $db->exec('PRAGMA foreign_keys = ON');
} catch (PDOException $e) {
    die('数据库连接失败: ' . $e->getMessage());
}

// 创建表
$db->exec('
    CREATE TABLE IF NOT EXISTS patients (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        name TEXT NOT NULL,
        gender TEXT NOT NULL,
        age INTEGER NOT NULL,
        diagnosis TEXT NOT NULL,
        discharge_date DATE NOT NULL,
        address TEXT,
        phone TEXT,
        remark TEXT,
        follow_up_count INTEGER DEFAULT 0,
        last_follow_up_date DATE,
        created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
        updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
    )
');

// 获取随访时间表
function getFollowUpSchedule($diagnosis) {
    if (strpos($diagnosis, '肾') !== false) {
        return [1, 2, 3, 6]; // 慢性肾脏病
    }
    return [1, 3, 6, 12]; // 脑卒中/心肌梗塞
}

// 获取下次随访日期
function getNextFollowUpDate($dischargeDate, $diagnosis, $followUpCount) {
    $schedule = getFollowUpSchedule($diagnosis);
    if ($followUpCount >= count($schedule)) {
        return null;
    }
    $months = $schedule[$followUpCount];
    return date('Y-m-d', strtotime($dischargeDate . " +{$months} months"));
}

// 获取随访状态
function getFollowUpStatus($nextDate) {
    if (!$nextDate) {
        return ['status' => '已完成', 'class' => 'success'];
    }
    
    $today = date('Y-m-d');
    $diff = (strtotime($nextDate) - strtotime($today)) / 86400;
    
    if ($diff < 0) {
        return ['status' => '已过期 ' . abs((int)$diff) . ' 天', 'class' => 'danger'];
    } elseif ($diff == 0) {
        return ['status' => '今日到期', 'class' => 'warning'];
    } elseif ($diff <= 7) {
        return ['status' => (int)$diff . ' 天后到期', 'class' => 'info'];
    }
    return ['status' => '未到期', 'class' => 'default'];
}

// 解析日期
function parseDate($value) {
    if (empty($value)) return null;
    
    $value = trim((string)$value);
    
    // Excel日期序列号（纯数字且在合理范围内）
    if (is_numeric($value) && (float)$value > 25569 && (float)$value < 50000) {
        $unixTimestamp = ((float)$value - 25569) * 86400;
        return date('Y-m-d', (int)$unixTimestamp);
    }
    
    // 各种格式
    $formats = ['Y.m.d', 'Y-m-d', 'Y/m/d', 'Y.n.j', 'Y-n-j', 'Y/n/j'];
    foreach ($formats as $format) {
        $date = DateTime::createFromFormat($format, $value);
        if ($date) {
            $errors = DateTime::getLastErrors();
            if (empty($errors['warning_count']) && empty($errors['error_count'])) {
                return $date->format('Y-m-d');
            }
        }
    }
    
    // 尝试 strtotime（处理更多格式）
    $timestamp = strtotime(str_replace('.', '-', $value));
    if ($timestamp && $timestamp > 0) {
        return date('Y-m-d', $timestamp);
    }
    
    return null;
}

// 获取诊断类型
function getDiagnosisType($diagnosis) {
    if (strpos($diagnosis, '脑卒中') !== false) return '脑卒中';
    if (strpos($diagnosis, '心肌梗') !== false || strpos($diagnosis, '心梗') !== false) return '心肌梗塞';
    if (strpos($diagnosis, '肾') !== false) return '慢性肾脏病';
    return $diagnosis;
}

// 处理请求
$action = $_GET['action'] ?? 'reminders';
$message = '';
$error = '';

// 处理POST请求
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $postAction = $_POST['action'] ?? '';
    
    if ($postAction === 'import') {
        // 处理文件导入
        if (isset($_FILES['file']) && $_FILES['file']['error'] === UPLOAD_ERR_OK) {
            $file = $_FILES['file'];
            $ext = strtolower(pathinfo($file['name'], PATHINFO_EXTENSION));
            
            $data = [];
            
            if ($ext === 'csv') {
                // CSV 处理
                $content = file_get_contents($file['tmp_name']);
                $encoding = mb_detect_encoding($content, ['UTF-8', 'GBK', 'GB2312'], true);
                if ($encoding && $encoding !== 'UTF-8') {
                    $content = mb_convert_encoding($content, 'UTF-8', $encoding);
                }
                
                // 移除 BOM
                if (substr($content, 0, 3) === "\xEF\xBB\xBF") {
                    $content = substr($content, 3);
                }
                
                $lines = str_getcsv($content, "\n");
                foreach ($lines as $line) {
                    $data[] = str_getcsv($line);
                }
            } elseif ($ext === 'xls') {
                // .xls 是旧版 Excel 格式，xlswriter 不支持读取
                $error = '不支持 .xls 格式（Excel 97-2003 旧格式）。请将文件另存为 .xlsx 格式或 .csv 格式后重新上传。<br><br><strong>操作方法：</strong>在 Excel 中打开文件 → 文件 → 另存为 → 选择"Excel 工作簿 (*.xlsx)"或"CSV UTF-8"';
            } elseif ($ext === 'xlsx' && class_exists('\Vtiful\Kernel\Excel')) {
                // 使用 xlswriter 处理 xlsx
                $tempDir = sys_get_temp_dir();
                $tempFile = $tempDir . '/' . uniqid('import_') . '.' . $ext;
                move_uploaded_file($file['tmp_name'], $tempFile);
                
                $config = ['path' => $tempDir];
                $excel = new \Vtiful\Kernel\Excel($config);
                $data = $excel->openFile(basename($tempFile))
                    ->openSheet()
                    ->getSheetData();
                
                // 释放 Excel 对象
                unset($excel);
                
                // 清理临时文件 (使用 @ 抑制 Windows 上的文件锁定警告)
                if (file_exists($tempFile)) {
                    @unlink($tempFile);
                }
                
                // 检查是否读取到数据
                if (empty($data)) {
                    $error = '无法读取 Excel 文件内容。请尝试将文件另存为 .csv 格式后重新上传。';
                }
            } else {
                $error = '不支持的文件格式，请上传 .xlsx 或 .csv 格式的文件';
            }
            
            if (!$error && !empty($data)) {
                $imported = 0;
                $errors = [];
                $headerSkipped = false;
                
                foreach ($data as $i => $row) {
                    // 跳过空行
                    if (empty($row) || !is_array($row)) continue;
                    
                    $firstCell = trim((string)($row[0] ?? ''));
                    
                    // 跳过表头行
                    if (!$headerSkipped && ($i === 0 || mb_strpos($firstCell, '姓名') !== false)) {
                        $headerSkipped = true;
                        continue;
                    }
                    
                    // 跳过空行
                    if (count($row) < 5 || empty($firstCell)) continue;
                    
                    $name = $firstCell;
                    
                    $dischargeDate = parseDate($row[4] ?? '');
                    if (!$dischargeDate) {
                        $errors[] = "第 " . ($i + 1) . " 行日期格式错误: " . ($row[4] ?? '空');
                        continue;
                    }
                    
                    // 处理年龄
                    $age = $row[2] ?? 0;
                    if (is_string($age)) {
                        $age = (int)preg_replace('/[^0-9]/', '', $age);
                    }
                    
                    // 处理电话（可能是科学计数法）
                    $phone = $row[6] ?? '';
                    if (is_numeric($phone)) {
                        $phone = number_format((float)$phone, 0, '', '');
                    }
                    
                    $stmt = $db->prepare('INSERT INTO patients (name, gender, age, diagnosis, discharge_date, address, phone, remark) VALUES (?, ?, ?, ?, ?, ?, ?, ?)');
                    $stmt->execute([
                        $name,
                        trim((string)($row[1] ?? '未知')),
                        (int)$age,
                        trim((string)($row[3] ?? '')),
                        $dischargeDate,
                        trim((string)($row[5] ?? '')),
                        trim((string)$phone),
                        trim((string)($row[7] ?? ''))
                    ]);
                    $imported++;
                }
                
                $message = "成功导入 {$imported} 条记录";
                if (count($errors) > 0) {
                    $error = implode('; ', array_slice($errors, 0, 5));
                }
            }
        }
    } elseif ($postAction === 'follow_up') {
        $id = (int)$_POST['id'];
        $stmt = $db->prepare('UPDATE patients SET follow_up_count = follow_up_count + 1, last_follow_up_date = ?, updated_at = ? WHERE id = ?');
        $stmt->execute([date('Y-m-d'), date('Y-m-d H:i:s'), $id]);
        $message = '已标记完成随访';
    } elseif ($postAction === 'delete') {
        $id = (int)$_POST['id'];
        $stmt = $db->prepare('DELETE FROM patients WHERE id = ?');
        $stmt->execute([$id]);
        $message = '已删除患者';
    }
}

// 导出功能 (使用 xlswriter 生成 Excel)
if ($action === 'export') {
    $filter = $_GET['filter'] ?? 'all';
    $patients = $db->query('SELECT * FROM patients ORDER BY discharge_date DESC')->fetchAll(PDO::FETCH_ASSOC);
    
    // 准备数据
    $rows = [];
    foreach ($patients as $p) {
        $schedule = getFollowUpSchedule($p['diagnosis']);
        if ($p['follow_up_count'] >= count($schedule)) continue;
        
        $nextDate = getNextFollowUpDate($p['discharge_date'], $p['diagnosis'], $p['follow_up_count']);
        $status = getFollowUpStatus($nextDate);
        $daysUntil = $nextDate ? (strtotime($nextDate) - strtotime(date('Y-m-d'))) / 86400 : null;
        
        // 筛选
        if ($filter === 'overdue' && $daysUntil >= 0) continue;
        if ($filter === 'today' && $daysUntil != 0) continue;
        if ($filter === 'upcoming' && ($daysUntil <= 0 || $daysUntil > 7)) continue;
        
        $rows[] = [
            $p['name'],
            $p['gender'],
            $p['age'],
            $p['diagnosis'],
            $p['discharge_date'],
            $nextDate ?? '',
            '第' . ($p['follow_up_count'] + 1) . '次',
            $status['status'],
            $p['address'] ?? '',
            $p['phone'] ?? '',
            $p['remark'] ?? ''
        ];
    }
    
    // 使用 xlswriter 生成 Excel
    $tempDir = sys_get_temp_dir();
    $filename = '随访提醒_' . date('Y-m-d_His') . '.xlsx';
    
    $config = ['path' => $tempDir];
    $excel = new \Vtiful\Kernel\Excel($config);
    
    $excel->fileName($filename)
        ->header(['姓名', '性别', '年龄', '出院诊断', '转诊时间', '下次随访日期', '第几次随访', '状态', '户籍地址', '联系方式', '备注'])
        ->data($rows)
        ->output();
    
    $filePath = $tempDir . '/' . $filename;
    
    header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
    header('Content-Disposition: attachment; filename="' . $filename . '"');
    header('Content-Length: ' . filesize($filePath));
    readfile($filePath);
    unlink($filePath);
    exit;
}

// 下载模板 (使用 xlswriter 生成 Excel)
if ($action === 'template') {
    $tempDir = sys_get_temp_dir();
    $filename = '导入模板.xlsx';
    
    $config = ['path' => $tempDir];
    $excel = new \Vtiful\Kernel\Excel($config);
    
    $data = [
        ['张三', '男', 65, '脑卒中', '2025.12.01', '北京市朝阳区', '13800138000', '常住'],
        ['李四', '女', 70, '慢性肾脏病', '2025.11.15', '上海市浦东新区', '13900139000', ''],
        ['王五', '男', 58, '心肌梗塞', '2025.10.20', '广州市天河区', '13700137000', ''],
    ];
    
    $excel->fileName($filename)
        ->header(['姓名', '性别', '年龄', '出院诊断', '转诊时间', '户籍地址', '联系方式', '备注'])
        ->data($data)
        ->output();
    
    $filePath = $tempDir . '/' . $filename;
    
    header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
    header('Content-Disposition: attachment; filename="' . $filename . '"');
    header('Content-Length: ' . filesize($filePath));
    readfile($filePath);
    unlink($filePath);
    exit;
}

// 获取统计数据
$allPatients = $db->query('SELECT * FROM patients')->fetchAll(PDO::FETCH_ASSOC);
$stats = [
    'total' => count($allPatients),
    'overdue' => 0,
    'today' => 0,
    'upcoming' => 0,
    'completed' => 0
];

foreach ($allPatients as $p) {
    $schedule = getFollowUpSchedule($p['diagnosis']);
    if ($p['follow_up_count'] >= count($schedule)) {
        $stats['completed']++;
        continue;
    }
    
    $nextDate = getNextFollowUpDate($p['discharge_date'], $p['diagnosis'], $p['follow_up_count']);
    if ($nextDate) {
        $daysUntil = (strtotime($nextDate) - strtotime(date('Y-m-d'))) / 86400;
        if ($daysUntil < 0) $stats['overdue']++;
        elseif ($daysUntil == 0) $stats['today']++;
        elseif ($daysUntil <= 7) $stats['upcoming']++;
    }
}

// 获取提醒列表
$filter = $_GET['filter'] ?? 'all';
$reminders = [];

foreach ($allPatients as $p) {
    $schedule = getFollowUpSchedule($p['diagnosis']);
    if ($p['follow_up_count'] >= count($schedule)) continue;
    
    $nextDate = getNextFollowUpDate($p['discharge_date'], $p['diagnosis'], $p['follow_up_count']);
    $status = getFollowUpStatus($nextDate);
    $daysUntil = $nextDate ? (strtotime($nextDate) - strtotime(date('Y-m-d'))) / 86400 : null;
    
    // 筛选
    if ($filter === 'overdue' && ($daysUntil === null || $daysUntil >= 0)) continue;
    if ($filter === 'today' && $daysUntil != 0) continue;
    if ($filter === 'upcoming' && ($daysUntil === null || $daysUntil <= 0 || $daysUntil > 7)) continue;
    
    $reminders[] = [
        'patient' => $p,
        'next_date' => $nextDate,
        'next_number' => $p['follow_up_count'] + 1,
        'status' => $status,
        'days_until' => $daysUntil,
        'schedule' => $schedule
    ];
}

// 按天数排序
usort($reminders, function($a, $b) {
    if ($a['days_until'] === null) return 1;
    if ($b['days_until'] === null) return -1;
    return $a['days_until'] - $b['days_until'];
});

?>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>病例回访提醒系统</title>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap" rel="stylesheet">
    <style>
        :root {
            --color-bg: #f8fafc;
            --color-bg-secondary: #ffffff;
            --color-bg-card: #ffffff;
            --color-bg-hover: #f1f5f9;
            --color-text: #1e293b;
            --color-text-secondary: #64748b;
            --color-text-muted: #94a3b8;
            --color-primary: #6366f1;
            --color-primary-light: #eef2ff;
            --color-primary-hover: #4f46e5;
            --color-success: #10b981;
            --color-success-light: #ecfdf5;
            --color-warning: #f59e0b;
            --color-warning-light: #fffbeb;
            --color-danger: #ef4444;
            --color-danger-light: #fef2f2;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
            background: var(--color-bg);
            color: var(--color-text);
            min-height: 100vh;
            line-height: 1.6;
        }

        .app-container { display: flex; min-height: 100vh; }

        .sidebar {
            width: 280px;
            background: var(--color-bg-secondary);
            border-right: 1px solid var(--color-border);
            padding: 28px 20px;
            position: fixed;
            height: 100vh;
            box-shadow: var(--shadow-sm);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            margin-bottom: 36px;
        }

        .logo-icon {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 700;
            background: linear-gradient(135deg, #6366f1, #8b5cf6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-menu { display: flex; flex-direction: column; gap: 6px; }

        .nav-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 18px;
            color: var(--color-text-secondary);
            text-decoration: none;
            border-radius: var(--radius-sm);
            transition: all 0.2s ease;
            font-weight: 500;
            font-size: 15px;
        }

        .nav-item:hover { background: var(--color-bg-hover); color: var(--color-text); }
        .nav-item.active { background: var(--color-primary-light); color: var(--color-primary); }

        .nav-badge {
            margin-left: auto;
            background: var(--color-danger);
            color: white;
            font-size: 11px;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 20px;
        }

        .main-content {
            flex: 1;
            margin-left: 280px;
            padding: 36px 48px;
        }

        .page-header { margin-bottom: 36px; }
        .page-title { font-size: 32px; font-weight: 700; margin-bottom: 8px; color: var(--color-text); letter-spacing: -0.5px; }
        .page-subtitle { color: var(--color-text-secondary); font-size: 16px; }

        .card {
            background: var(--color-bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--color-border);
            padding: 28px;
            margin-bottom: 24px;
            box-shadow: var(--shadow-sm);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 36px;
        }

        .stat-card {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius);
            padding: 24px 28px;
            text-decoration: none;
            color: inherit;
            transition: all 0.2s ease;
        }

        .stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .stat-card.active { border-color: var(--color-primary); background: var(--color-primary-light); }

        .stat-value { font-size: 36px; font-weight: 700; margin-bottom: 6px; letter-spacing: -1px; }
        .stat-label { color: var(--color-text-secondary); font-size: 14px; font-weight: 500; }

        .stat-card.danger .stat-value { color: var(--color-danger); }
        .stat-card.warning .stat-value { color: var(--color-warning); }
        .stat-card.success .stat-value { color: var(--color-success); }
        .stat-card.info .stat-value { color: var(--color-primary); }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 22px;
            border: none;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            text-decoration: none;
            font-family: inherit;
        }

        .btn-primary {
            background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
            color: white;
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
        }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4); }
        
        .btn-success {
            background: linear-gradient(135deg, #10b981 0%, #059669 100%);
            color: white;
            box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
        }
        .btn-success:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4); }
        
        .btn-danger { background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%); color: white; }
        .btn-outline { background: var(--color-bg-secondary); border: 1px solid var(--color-border); color: var(--color-text-secondary); }
        .btn-outline:hover { background: var(--color-bg-hover); border-color: var(--color-text-muted); color: var(--color-text); }
        .btn-sm { padding: 8px 16px; font-size: 13px; }

        .badge {
            display: inline-flex;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
        }

        .badge-danger { background: var(--color-danger-light); color: var(--color-danger); }
        .badge-warning { background: var(--color-warning-light); color: var(--color-warning); }
        .badge-success { background: var(--color-success-light); color: var(--color-success); }
        .badge-info { background: var(--color-primary-light); color: var(--color-primary); }
        .badge-default { background: var(--color-bg-hover); color: var(--color-text-secondary); }

        .alert {
            padding: 18px 24px;
            border-radius: var(--radius-sm);
            margin-bottom: 24px;
        }

        .alert-success { background: var(--color-success-light); border: 1px solid var(--color-success); color: var(--color-success); }
        .alert-error { background: var(--color-danger-light); border: 1px solid var(--color-danger); color: var(--color-danger); }

        .filter-tabs { display: flex; gap: 10px; margin-bottom: 28px; flex-wrap: wrap; }

        .filter-tab {
            padding: 10px 22px;
            border-radius: 24px;
            background: var(--color-bg-secondary);
            border: 1px solid var(--color-border);
            color: var(--color-text-secondary);
            font-size: 14px;
            font-weight: 500;
            text-decoration: none;
            transition: all 0.2s ease;
        }

        .filter-tab:hover { background: var(--color-bg-hover); color: var(--color-text); }
        .filter-tab.active { background: var(--color-primary); border-color: var(--color-primary); color: white; }

        .patient-card {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius);
            padding: 24px;
            margin-bottom: 20px;
            transition: all 0.2s ease;
            box-shadow: var(--shadow-sm);
        }

        .patient-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow); }

        .patient-card-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            margin-bottom: 20px;
        }

        .patient-name { font-size: 20px; font-weight: 700; margin-bottom: 6px; color: var(--color-text); }
        .patient-meta { color: var(--color-text-secondary); font-size: 14px; }

        .patient-card-body {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            margin-bottom: 20px;
        }

        .patient-info-item { font-size: 14px; }
        .patient-info-label { color: var(--color-text-muted); margin-bottom: 4px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
        .patient-info-value { color: var(--color-text); font-weight: 500; }

        .patient-card-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 20px;
            border-top: 1px solid var(--color-border-light);
            flex-wrap: wrap;
            gap: 12px;
        }

        .action-buttons { display: flex; gap: 10px; }

        .file-upload {
            border: 2px dashed var(--color-border);
            border-radius: var(--radius);
            padding: 56px 24px;
            text-align: center;
            cursor: pointer;
            transition: all 0.2s ease;
            background: var(--color-bg);
        }

        .file-upload:hover { border-color: var(--color-primary); background: var(--color-primary-light); }
        .file-upload-text { color: var(--color-text); margin-bottom: 8px; font-weight: 500; }
        .file-upload-hint { color: var(--color-text-muted); font-size: 14px; }

        table { width: 100%; border-collapse: collapse; }
        th, td { padding: 16px 18px; text-align: left; border-bottom: 1px solid var(--color-border-light); }
        th { color: var(--color-text-secondary); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; background: var(--color-bg); }
        tr:hover td { background: var(--color-bg-hover); }

        .empty-state { text-align: center; padding: 72px 24px; color: var(--color-text-muted); }
        .empty-state-title { font-size: 20px; font-weight: 600; color: var(--color-text); margin-bottom: 8px; }

        @media (max-width: 768px) {
            .sidebar { display: none; }
            .main-content { margin-left: 0; padding: 24px 20px; }
            .patient-card-body { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
        }

        /* 动画 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fade-in { animation: fadeIn 0.3s ease; }
    </style>
</head>
<body>
    <div class="app-container">
        <aside class="sidebar">
            <div class="logo">
                <div class="logo-icon">🏥</div>
                <span class="logo-text">回访提醒</span>
            </div>
            
            <nav class="nav-menu">
                <a href="?action=reminders" class="nav-item <?= $action === 'reminders' ? 'active' : '' ?>">
                    🕐 随访提醒
                    <?php if ($stats['overdue'] > 0): ?>
                        <span class="nav-badge"><?= $stats['overdue'] ?></span>
                    <?php endif; ?>
                </a>
                <a href="?action=list" class="nav-item <?= $action === 'list' ? 'active' : '' ?>">
                    👥 患者列表
                </a>
                <a href="?action=import" class="nav-item <?= $action === 'import' ? 'active' : '' ?>">
                    📤 导入数据
                </a>
            </nav>
        </aside>

        <main class="main-content">
            <?php if ($message): ?>
                <div class="alert alert-success"><?= htmlspecialchars($message) ?></div>
            <?php endif; ?>
            
            <?php if ($error): ?>
                <div class="alert alert-error"><?= htmlspecialchars($error) ?></div>
            <?php endif; ?>

            <?php if ($action === 'reminders'): ?>
                <!-- 随访提醒页面 -->
                <div class="page-header">
                    <h1 class="page-title">随访提醒</h1>
                    <p class="page-subtitle">查看需要随访的患者，及时完成回访工作</p>
                </div>

                <div class="stats-grid">
                    <a href="?action=reminders&filter=all" class="stat-card <?= $filter === 'all' ? 'active' : '' ?>">
                        <div class="stat-value"><?= $stats['total'] ?></div>
                        <div class="stat-label">总患者数</div>
                    </a>
                    <a href="?action=reminders&filter=overdue" class="stat-card danger <?= $filter === 'overdue' ? 'active' : '' ?>">
                        <div class="stat-value"><?= $stats['overdue'] ?></div>
                        <div class="stat-label">已过期</div>
                    </a>
                    <a href="?action=reminders&filter=today" class="stat-card warning <?= $filter === 'today' ? 'active' : '' ?>">
                        <div class="stat-value"><?= $stats['today'] ?></div>
                        <div class="stat-label">今日到期</div>
                    </a>
                    <a href="?action=reminders&filter=upcoming" class="stat-card info <?= $filter === 'upcoming' ? 'active' : '' ?>">
                        <div class="stat-value"><?= $stats['upcoming'] ?></div>
                        <div class="stat-label">7天内到期</div>
                    </a>
                    <div class="stat-card success">
                        <div class="stat-value"><?= $stats['completed'] ?></div>
                        <div class="stat-label">已完成全部</div>
                    </div>
                </div>

                <div class="filter-tabs">
                    <a href="?action=reminders&filter=all" class="filter-tab <?= $filter === 'all' ? 'active' : '' ?>">全部</a>
                    <a href="?action=reminders&filter=overdue" class="filter-tab <?= $filter === 'overdue' ? 'active' : '' ?>">已过期</a>
                    <a href="?action=reminders&filter=today" class="filter-tab <?= $filter === 'today' ? 'active' : '' ?>">今日到期</a>
                    <a href="?action=reminders&filter=upcoming" class="filter-tab <?= $filter === 'upcoming' ? 'active' : '' ?>">即将到期</a>
                </div>

                <div style="margin-bottom: 24px;">
                    <a href="?action=export&filter=<?= $filter ?>" class="btn btn-outline">📥 导出当前列表</a>
                </div>

                <?php if (empty($reminders)): ?>
                    <div class="card">
                        <div class="empty-state">
                            <div style="font-size: 48px; margin-bottom: 16px;">😊</div>
                            <div class="empty-state-title">暂无需要随访的患者</div>
                            <p>当前筛选条件下没有需要随访的患者</p>
                            <div style="margin-top: 20px;">
                                <a href="?action=import" class="btn btn-primary">导入患者数据</a>
                            </div>
                        </div>
                    </div>
                <?php else: ?>
                    <?php foreach ($reminders as $r): ?>
                        <?php $p = $r['patient']; ?>
                        <div class="patient-card">
                            <div class="patient-card-header">
                                <div>
                                    <div class="patient-name"><?= htmlspecialchars($p['name']) ?></div>
                                    <div class="patient-meta"><?= htmlspecialchars($p['gender']) ?> · <?= $p['age'] ?>岁 · <?= getDiagnosisType($p['diagnosis']) ?></div>
                                </div>
                                <span class="badge badge-<?= $r['status']['class'] ?>"><?= $r['status']['status'] ?></span>
                            </div>
                            
                            <div class="patient-card-body">
                                <div class="patient-info-item">
                                    <div class="patient-info-label">出院诊断</div>
                                    <div class="patient-info-value"><?= htmlspecialchars($p['diagnosis']) ?></div>
                                </div>
                                <div class="patient-info-item">
                                    <div class="patient-info-label">转诊日期</div>
                                    <div class="patient-info-value"><?= date('Y年m月d日', strtotime($p['discharge_date'])) ?></div>
                                </div>
                                <div class="patient-info-item">
                                    <div class="patient-info-label">下次随访</div>
                                    <div class="patient-info-value">第<?= $r['next_number'] ?>次 · <?= $r['next_date'] ? date('Y年m月d日', strtotime($r['next_date'])) : '-' ?></div>
                                </div>
                                <div class="patient-info-item">
                                    <div class="patient-info-label">联系方式</div>
                                    <div class="patient-info-value"><?= $p['phone'] ?: '-' ?></div>
                                </div>
                                <div class="patient-info-item">
                                    <div class="patient-info-label">户籍地址</div>
                                    <div class="patient-info-value"><?= $p['address'] ?: '-' ?></div>
                                </div>
                                <div class="patient-info-item">
                                    <div class="patient-info-label">备注</div>
                                    <div class="patient-info-value"><?= $p['remark'] ?: '-' ?></div>
                                </div>
                            </div>
                            
                            <div class="patient-card-footer">
                                <div style="color: var(--color-text-muted); font-size: 13px;">
                                    随访进度: <?= $p['follow_up_count'] ?>/<?= count($r['schedule']) ?>
                                    <span style="margin-left: 8px;">（<?= implode('、', array_map(fn($m) => $m.'个月', $r['schedule'])) ?>）</span>
                                </div>
                                <div class="action-buttons">
                                    <?php if ($p['phone']): ?>
                                        <a href="tel:<?= $p['phone'] ?>" class="btn btn-outline btn-sm">📞 拨打电话</a>
                                    <?php endif; ?>
                                    <form method="POST" style="display: inline;" onsubmit="return confirm('确认标记 <?= htmlspecialchars($p['name']) ?> 完成第<?= $r['next_number'] ?>次随访？')">
                                        <input type="hidden" name="action" value="follow_up">
                                        <input type="hidden" name="id" value="<?= $p['id'] ?>">
                                        <button type="submit" class="btn btn-success btn-sm">✓ 标记已随访</button>
                                    </form>
                                </div>
                            </div>
                        </div>
                    <?php endforeach; ?>
                <?php endif; ?>

            <?php elseif ($action === 'list'): ?>
                <!-- 患者列表页面 -->
                <div class="page-header">
                    <h1 class="page-title">患者列表</h1>
                    <p class="page-subtitle">管理所有患者信息，查看随访状态</p>
                </div>

                <div class="card">
                    <?php if (empty($allPatients)): ?>
                        <div class="empty-state">
                            <div style="font-size: 48px; margin-bottom: 16px;">👥</div>
                            <div class="empty-state-title">暂无患者数据</div>
                            <p>请先导入患者数据</p>
                            <div style="margin-top: 20px;">
                                <a href="?action=import" class="btn btn-primary">导入患者数据</a>
                            </div>
                        </div>
                    <?php else: ?>
                        <div style="overflow-x: auto;">
                            <table>
                                <thead>
                                    <tr>
                                        <th>姓名</th>
                                        <th>性别</th>
                                        <th>年龄</th>
                                        <th>诊断</th>
                                        <th>转诊日期</th>
                                        <th>随访进度</th>
                                        <th>状态</th>
                                        <th>联系方式</th>
                                        <th>操作</th>
                                    </tr>
                                </thead>
                                <tbody>
                                    <?php foreach ($allPatients as $p): ?>
                                        <?php 
                                            $schedule = getFollowUpSchedule($p['diagnosis']);
                                            $isCompleted = $p['follow_up_count'] >= count($schedule);
                                            $nextDate = $isCompleted ? null : getNextFollowUpDate($p['discharge_date'], $p['diagnosis'], $p['follow_up_count']);
                                            $status = getFollowUpStatus($nextDate);
                                        ?>
                                        <tr>
                                            <td><strong><?= htmlspecialchars($p['name']) ?></strong></td>
                                            <td><?= htmlspecialchars($p['gender']) ?></td>
                                            <td><?= $p['age'] ?>岁</td>
                                            <td><?= getDiagnosisType($p['diagnosis']) ?></td>
                                            <td><?= $p['discharge_date'] ?></td>
                                            <td><?= $p['follow_up_count'] ?>/<?= count($schedule) ?></td>
                                            <td><span class="badge badge-<?= $status['class'] ?>"><?= $status['status'] ?></span></td>
                                            <td><?= $p['phone'] ?: '-' ?></td>
                                            <td>
                                                <div class="action-buttons">
                                                    <?php if (!$isCompleted): ?>
                                                        <form method="POST" style="display: inline;">
                                                            <input type="hidden" name="action" value="follow_up">
                                                            <input type="hidden" name="id" value="<?= $p['id'] ?>">
                                                            <button type="submit" class="btn btn-outline btn-sm">✓ 随访</button>
                                                        </form>
                                                    <?php endif; ?>
                                                    <form method="POST" style="display: inline;" onsubmit="return confirm('确认删除患者 <?= htmlspecialchars($p['name']) ?>？')">
                                                        <input type="hidden" name="action" value="delete">
                                                        <input type="hidden" name="id" value="<?= $p['id'] ?>">
                                                        <button type="submit" class="btn btn-outline btn-sm" style="color: var(--color-danger);">🗑</button>
                                                    </form>
                                                </div>
                                            </td>
                                        </tr>
                                    <?php endforeach; ?>
                                </tbody>
                            </table>
                        </div>
                    <?php endif; ?>
                </div>

            <?php elseif ($action === 'import'): ?>
                <!-- 导入页面 -->
                <div class="page-header">
                    <h1 class="page-title">导入患者数据</h1>
                    <p class="page-subtitle">支持 Excel (.xlsx) 和 CSV 格式的文件导入</p>
                </div>

                <div class="card">
                    <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px;">
                        <span style="font-weight: 600;">上传文件</span>
                        <a href="?action=template" class="btn btn-outline btn-sm">📥 下载导入模板 (Excel)</a>
                    </div>

                    <form method="POST" enctype="multipart/form-data">
                        <input type="hidden" name="action" value="import">
                        <div class="file-upload" onclick="document.getElementById('fileInput').click()">
                            <div style="font-size: 48px; margin-bottom: 16px;">📂</div>
                            <div class="file-upload-text">点击选择文件上传</div>
                            <div class="file-upload-hint">支持 .xlsx 和 .csv 格式，最大 10MB</div>
                            <input type="file" name="file" id="fileInput" accept=".xlsx,.csv" required style="display: none;" onchange="this.form.submit()">
                        </div>
                    </form>
                </div>
                
                <div class="card" style="background: var(--color-warning-light); border-color: var(--color-warning);">
                    <div style="display: flex; gap: 12px; align-items: flex-start;">
                        <span style="font-size: 24px;">⚠️</span>
                        <div>
                            <div style="font-weight: 600; color: var(--color-warning); margin-bottom: 8px;">关于 .xls 格式</div>
                            <div style="color: var(--color-text-secondary); font-size: 14px; line-height: 1.8;">
                                如果你的文件是 <strong>.xls 格式</strong>（Excel 97-2003 旧格式），请先转换为新格式：<br>
                                1. 在 Excel 中打开 .xls 文件<br>
                                2. 点击 <strong>文件 → 另存为</strong><br>
                                3. 选择 <strong>"Excel 工作簿 (*.xlsx)"</strong> 或 <strong>"CSV UTF-8"</strong><br>
                                4. 保存后重新上传
                            </div>
                        </div>
                    </div>
                </div>

                <div class="card">
                    <h3 style="margin-bottom: 16px;">📋 导入说明</h3>
                    
                    <h4 style="margin-bottom: 12px; color: var(--color-text);">文件格式要求</h4>
                    <p style="color: var(--color-text-secondary); margin-bottom: 16px;">Excel 或 CSV 文件需按以下列顺序排列：</p>
                    
                    <table style="margin-bottom: 24px;">
                        <thead>
                            <tr><th>列序号</th><th>字段</th><th>说明</th><th>必填</th></tr>
                        </thead>
                        <tbody>
                            <tr><td>1</td><td>姓名</td><td>患者姓名</td><td><span class="badge badge-danger">是</span></td></tr>
                            <tr><td>2</td><td>性别</td><td>男/女</td><td><span class="badge badge-danger">是</span></td></tr>
                            <tr><td>3</td><td>年龄</td><td>数字</td><td><span class="badge badge-danger">是</span></td></tr>
                            <tr><td>4</td><td>出院诊断</td><td>脑卒中、心肌梗塞、慢性肾脏病 等</td><td><span class="badge badge-danger">是</span></td></tr>
                            <tr><td>5</td><td>转诊时间</td><td>格式：2025.12.01 或 2025-12-01</td><td><span class="badge badge-danger">是</span></td></tr>
                            <tr><td>6</td><td>户籍地址</td><td>详细地址</td><td><span class="badge badge-info">否</span></td></tr>
                            <tr><td>7</td><td>联系方式</td><td>电话号码</td><td><span class="badge badge-info">否</span></td></tr>
                            <tr><td>8</td><td>备注</td><td>其他信息</td><td><span class="badge badge-info">否</span></td></tr>
                        </tbody>
                    </table>

                    <h4 style="margin-bottom: 12px; color: var(--color-text);">随访时间规则</h4>
                    <div style="display: grid; gap: 12px;">
                        <div style="padding: 16px; background: var(--color-bg-secondary); border-radius: var(--radius-sm); border-left: 4px solid var(--color-primary);">
                            <div style="font-weight: 600; margin-bottom: 4px;">🧠 脑卒中 / 心肌梗塞</div>
                            <div style="color: var(--color-text-secondary);">
                                第1次: <strong>1个月</strong> · 第2次: <strong>3个月</strong> · 第3次: <strong>6个月</strong> · 第4次: <strong>12个月</strong>
                            </div>
                        </div>
                        <div style="padding: 16px; background: var(--color-bg-secondary); border-radius: var(--radius-sm); border-left: 4px solid var(--color-warning);">
                            <div style="font-weight: 600; margin-bottom: 4px;">🫘 慢性肾脏病</div>
                            <div style="color: var(--color-text-secondary);">
                                第1次: <strong>1个月</strong> · 第2次: <strong>2个月</strong> · 第3次: <strong>3个月</strong> · 第4次: <strong>6个月</strong>
                            </div>
                        </div>
                    </div>
                </div>
            <?php endif; ?>
        </main>
    </div>
</body>
</html>