'use client';

import dynamic from 'next/dynamic';
import * as React from 'react';
import { useCallback, useEffect, useState } from 'react';
import { toast } from 'sonner';
import {
  Activity,
  Cpu,
  Database,
  Download,
  FileText,
  HardDrive,
  Layers,
  RefreshCw,
  Server,
  Terminal,
} from 'lucide-react';

import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Skeleton } from '@/components/ui/skeleton';
import services from '@/lib/services';
import type { DBOverview } from '@/lib/services/db-manage';

const sectionFallback = (
  <div className='h-48 animate-pulse rounded-lg border border-border/40 bg-muted/20' />
);

const TableBrowser = dynamic(
  () => import('./components/table-browser').then((mod) => mod.TableBrowser),
  { loading: () => sectionFallback },
);

const CacheManager = dynamic(
  () => import('./components/cache-manager').then((mod) => mod.CacheManager),
  { loading: () => sectionFallback },
);

const SQLConsole = dynamic(
  () => import('./components/sql-console').then((mod) => mod.SQLConsole),
  { ssr: false },
);

/**
 * 格式化数字，每3位加逗号
 */
const formatNumber = (num: number | string) => {
  if (num === undefined || num === null) return '0';
  return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
};

export function DatabasePageClient() {
  // 核心状态
  const [overview, setOverview] = useState<DBOverview | null>(null);
  const [tables, setTables] = useState<string[]>([]);
  const [loadingOverview, setLoadingOverview] = useState<boolean>(true);
  const [loadingTables, setLoadingTables] = useState<boolean>(true);
  const [exporting, setExporting] = useState<boolean>(false);

  // 协调子组件刷新与视图切换状态
  const [showConsole, setShowConsole] = useState<boolean>(false);
  const [refreshTrigger, setRefreshTrigger] = useState<number>(0);

  // 1. 获取运行概览
  const fetchOverview = useCallback(async (isSilent = false) => {
    if (!isSilent) setLoadingOverview(true);
    try {
      const data = await services.dbManage.getOverview();
      setOverview(data);
    } catch (err) {
      toast.error('获取数据库概览失败', {
        description: err instanceof Error ? err.message : '未知错误',
      });
    } finally {
      setLoadingOverview(false);
    }
  }, []);

  // 2. 获取表列表
  const fetchTables = useCallback(async () => {
    setLoadingTables(true);
    try {
      const data = await services.dbManage.listTables();
      setTables(data);
    } catch (err) {
      toast.error('获取数据库数据表列表失败', {
        description: err instanceof Error ? err.message : '未知错误',
      });
    } finally {
      setLoadingTables(false);
    }
  }, []);

  // 3. 协调刷新
  const handleRefreshAll = () => {
    fetchOverview();
    fetchTables();
    setRefreshTrigger((prev) => prev + 1);
  };

  // 4. 导出数据库备份
  const handleExport = async () => {
    setExporting(true);
    try {
      const { blob, filename } = await services.dbManage.exportDatabase();
      const url = URL.createObjectURL(blob);
      const a = document.createElement('a');
      a.href = url;
      a.download = filename;
      document.body.appendChild(a);
      a.click();
      a.remove();
      URL.revokeObjectURL(url);
      toast.success('数据库导出成功', {
        description: `已下载归档文件: ${filename}`,
      });
    } catch (err) {
      toast.error('数据库导出失败', {
        description: err instanceof Error ? err.message : '导出异常',
      });
    } finally {
      setExporting(false);
    }
  };

  // 初始化加载
  useEffect(() => {
    fetchOverview();
    fetchTables();
  }, [fetchOverview, fetchTables]);

  // 渲染概览卡片骨架
  const renderOverviewSkeleton = () => (
    <div className='grid grid-cols-2 md:grid-cols-3 lg:grid-cols-6 gap-4'>
      {Array.from({ length: 6 }).map((_, i) => (
        <Card key={i} className='border-border/40 bg-card/50'>
          <CardHeader className='pb-2'>
            <Skeleton className='h-4 w-16' />
          </CardHeader>
          <CardContent>
            <Skeleton className='h-6 w-24' />
          </CardContent>
        </Card>
      ))}
    </div>
  );

  // 渲染 SQL 查询控台全屏视图
  if (showConsole) {
    return (
      <SQLConsole
        dbType={overview?.type}
        onClose={() => setShowConsole(false)}
      />
    );
  }

  // 正常页面排版布局
  return (
    <div className='py-6 px-1 space-y-6 w-full'>
      {/* 顶部控制与标题 */}
      <div className='flex flex-col sm:flex-row sm:items-center sm:justify-between pb-4 gap-4'>
        <div className='flex items-center gap-2'>
          <Database className='size-5 text-primary' />
          <div>
            <h1 className='text-2xl font-semibold tracking-tight'>数据管理</h1>
          </div>
        </div>
        <Button
          size='sm'
          variant='secondary'
          className='h-8 gap-1.5 text-xs self-start sm:self-auto'
          onClick={handleRefreshAll}
          disabled={loadingOverview}
        >
          <RefreshCw
            className={`size-3 ${loadingOverview ? 'animate-spin' : ''}`}
          />
          刷新数据
        </Button>
      </div>

      {/* 1. 概览指标卡片组 */}
      {loadingOverview
        ? renderOverviewSkeleton()
        : overview && (
            <div className='grid grid-cols-2 md:grid-cols-3 lg:grid-cols-6 gap-4'>
              {/* 卡片1: 数据库类型 */}
              <Card className='shadow-sm border-border/40 bg-card/50 backdrop-blur-sm hover:border-primary/20 transition-all duration-300'>
                <CardHeader className='flex flex-row items-center justify-between pb-2 space-y-0'>
                  <CardDescription className='text-[10px] font-medium'>
                    数据库类型
                  </CardDescription>
                  <Server className='size-3.5 text-muted-foreground' />
                </CardHeader>
                <CardContent>
                  <div className='text-sm font-bold uppercase'>
                    {overview.type}
                  </div>
                </CardContent>
              </Card>

              {/* 卡片2: 数据库版本 */}
              <Card className='shadow-sm border-border/40 bg-card/50 backdrop-blur-sm hover:border-primary/20 transition-all duration-300 col-span-1 md:col-span-2 lg:col-span-1'>
                <CardHeader className='flex flex-row items-center justify-between pb-2 space-y-0'>
                  <CardDescription className='text-[10px] font-medium'>
                    版本信息
                  </CardDescription>
                  <Cpu className='size-3.5 text-muted-foreground' />
                </CardHeader>
                <CardContent>
                  <div
                    className='text-xs font-semibold truncate'
                    title={overview.version}
                  >
                    {overview.version.split(' ').slice(0, 2).join(' ')}
                  </div>
                </CardContent>
              </Card>

              {/* 卡片3: 数据库名称 */}
              <Card className='shadow-sm border-border/40 bg-card/50 backdrop-blur-sm hover:border-primary/20 transition-all duration-300'>
                <CardHeader className='flex flex-row items-center justify-between pb-2 space-y-0'>
                  <CardDescription className='text-[10px] font-medium'>
                    名称/路径
                  </CardDescription>
                  <Database className='size-3.5 text-muted-foreground' />
                </CardHeader>
                <CardContent>
                  <div
                    className='text-xs font-semibold truncate'
                    title={overview.name}
                  >
                    {overview.name.substring(
                      overview.name.lastIndexOf('/') + 1,
                    )}
                  </div>
                </CardContent>
              </Card>

              {/* 卡片4: 数据库大小 */}
              <Card className='shadow-sm border-border/40 bg-card/50 backdrop-blur-sm hover:border-primary/20 transition-all duration-300'>
                <CardHeader className='flex flex-row items-center justify-between pb-2 space-y-0'>
                  <CardDescription className='text-[10px] font-medium'>
                    数据库大小
                  </CardDescription>
                  <HardDrive className='size-3.5 text-muted-foreground' />
                </CardHeader>
                <CardContent>
                  <div className='text-sm font-bold'>{overview.size}</div>
                </CardContent>
              </Card>

              {/* 卡片5: 表数量 */}
              <Card className='shadow-sm border-border/40 bg-card/50 backdrop-blur-sm hover:border-primary/20 transition-all duration-300'>
                <CardHeader className='flex flex-row items-center justify-between pb-2 space-y-0'>
                  <CardDescription className='text-[10px] font-medium'>
                    物理数据表
                  </CardDescription>
                  <Layers className='size-3.5 text-muted-foreground' />
                </CardHeader>
                <CardContent>
                  <div className='text-sm font-bold'>
                    {formatNumber(overview.table_count)}
                  </div>
                </CardContent>
              </Card>

              {/* 卡片6: 连接数 */}
              <Card className='shadow-sm border-border/40 bg-card/50 backdrop-blur-sm hover:border-primary/20 transition-all duration-300'>
                <CardHeader className='flex flex-row items-center justify-between pb-2 space-y-0'>
                  <CardDescription className='text-[10px] font-medium'>
                    活跃连接数
                  </CardDescription>
                  <Activity className='size-3.5 text-muted-foreground' />
                </CardHeader>
                <CardContent>
                  <div className='text-sm font-bold'>
                    {formatNumber(overview.connections)}
                  </div>
                </CardContent>
              </Card>
            </div>
          )}

      {/* 2. 数据表浏览器区块 */}
      <TableBrowser
        tables={tables}
        loadingTables={loadingTables}
        refreshTrigger={refreshTrigger}
      />

      {/* 3. 缓存管理区块 */}
      <CacheManager refreshTrigger={refreshTrigger} />

      {/* 4. 底部功能卡片区 */}
      <Card className='border-border/40 bg-card/50 backdrop-blur-sm shadow-sm'>
        <CardHeader className='pb-3 border-b border-dashed'>
          <CardTitle className='text-sm font-semibold'>功能区</CardTitle>
          <CardDescription className='text-[11px]'>
            数据库导出及自定义高级 SQL 执行终端
          </CardDescription>
        </CardHeader>
        <CardContent className='pt-4'>
          <div className='grid grid-cols-1 md:grid-cols-2 gap-4'>
            {/* 功能一: 数据库导出 */}
            <div className='flex items-center justify-between p-4 border border-dashed rounded-lg hover:bg-muted/20 transition-colors duration-150'>
              <div className='space-y-1 pr-4'>
                <p className='text-xs font-semibold flex items-center gap-1.5'>
                  <Download className='size-4 text-primary' />
                  数据库备份导出
                </p>
                <p className='text-[10px] text-muted-foreground'>
                  直接导出并下载物理数据库镜像文件（SQLite 导出 .db，PostgreSQL
                  导出为打包的 .sql 文本文件）
                </p>
              </div>
              <Button
                size='sm'
                variant='outline'
                className='h-8 text-xs gap-1'
                onClick={handleExport}
                disabled={exporting}
              >
                <RefreshCw
                  className={`size-3 ${exporting ? 'animate-spin' : ''}`}
                />
                {exporting ? '正在准备...' : '开始导出'}
              </Button>
            </div>

            {/* 功能二: SQL 查询终端 */}
            <div className='flex items-center justify-between p-4 border border-dashed rounded-lg hover:bg-muted/20 transition-colors duration-150'>
              <div className='space-y-1 pr-4'>
                <p className='text-xs font-semibold flex items-center gap-1.5'>
                  <Terminal className='size-4 text-primary' />
                  SQL 查询控台
                </p>
                <p className='text-[10px] text-muted-foreground'>
                  打开在线 SQL 控制终端，执行原生的 SQL
                  进行数据筛选、更新、调试或性能优化
                </p>
              </div>
              <Button
                size='sm'
                className='h-8 text-xs gap-1 bg-primary text-primary-foreground hover:bg-primary/95'
                onClick={() => {
                  setShowConsole(true);
                }}
              >
                <FileText className='size-3.5' />
                进入控台
              </Button>
            </div>
          </div>
        </CardContent>
      </Card>
    </div>
  );
}