'use client';

import * as React from 'react';
import { useCallback, useEffect, useState } from 'react';
import { toast } from 'sonner';
import { Layers, RefreshCw } from 'lucide-react';

import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import { Skeleton } from '@/components/ui/skeleton';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';
import { Button } from '@/components/ui/button';
import type { TableDataResponse } from '@/lib/services/db-manage';
import { DbManageService } from '@/lib/services/db-manage';

/**
 * 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})+(?!\B))/g, ',');
};

/**
 * 格式化表格单元格内容
 */
const formatCellValue = (val: unknown): string => {
  if (val === null || val === undefined) return '-';
  if (typeof val === 'boolean') return val ? 'true' : 'false';
  if (typeof val === 'object') {
    try {
      return JSON.stringify(val);
    } catch {
      return '[Object]';
    }
  }
  return String(val);
};

interface TableBrowserProps {
  tables: string[];
  loadingTables: boolean;
  refreshTrigger: number;
}

export function TableBrowser({
  tables,
  loadingTables,
  refreshTrigger,
}: TableBrowserProps) {
  const [selectedTable, setSelectedTable] = useState<string>('');
  const [tableData, setTableData] = useState<TableDataResponse | null>(null);
  const [page, setPage] = useState<number>(1);
  const [loadingData, setLoadingData] = useState<boolean>(false);
  const pageSize = 10;

  // 获取具体表数据
  const fetchTableData = useCallback(
    async (tableName: string, targetPage: number, size: number) => {
      if (!tableName) return;
      setLoadingData(true);
      try {
        const data = await DbManageService.getTableData({
          table: tableName,
          page: targetPage,
          pageSize: size,
        });
        setTableData(data);
      } catch (err) {
        toast.error(`获取数据表 ${tableName} 数据失败`, {
          description: err instanceof Error ? err.message : '未知错误',
        });
      } finally {
        setLoadingData(false);
      }
    },
    [],
  );

  // 默认选择第一张表
  useEffect(() => {
    if (tables.length > 0 && !selectedTable) {
      setSelectedTable(tables[0]);
    }
  }, [tables, selectedTable]);

  // 当选中的表、页码或外部刷新触发器改变时获取数据
  useEffect(() => {
    if (selectedTable) {
      fetchTableData(selectedTable, page, pageSize);
    }
  }, [selectedTable, page, pageSize, refreshTrigger, fetchTableData]);

  // 处理页码改变
  const handlePageChange = (newPage: number) => {
    setPage(newPage);
  };

  // 处理表切换
  const handleTableChange = (value: string) => {
    setSelectedTable(value);
    setPage(1); // 切换表重置为第一页
  };

  return (
    <Card className='border-border/40 bg-card/50 backdrop-blur-sm shadow-sm'>
      <CardHeader className='pb-3 border-b border-dashed flex flex-col md:flex-row md:items-center md:justify-between gap-4'>
        <div className='space-y-0.5'>
          <CardTitle className='text-sm font-semibold'>数据表浏览器</CardTitle>
          <CardDescription className='text-[11px]'>
            浏览数据库中的物理数据表详情及内容
          </CardDescription>
        </div>

        <div className='flex items-center gap-2'>
          {loadingTables ? (
            <Skeleton className='h-8 w-48' />
          ) : (
            <Select value={selectedTable} onValueChange={handleTableChange}>
              <SelectTrigger className='h-8 w-[200px] text-xs bg-background border-border/40'>
                <SelectValue placeholder='选择数据表' />
              </SelectTrigger>
              <SelectContent className='max-h-[300px]'>
                {tables.map((t) => (
                  <SelectItem key={t} value={t} className='text-xs font-mono'>
                    {t}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          )}
        </div>
      </CardHeader>
      <CardContent className='pt-4'>
        {loadingData && !tableData ? (
          <div className='space-y-3 py-6'>
            <Skeleton className='h-6 w-full' />
            <Skeleton className='h-10 w-full' />
            <Skeleton className='h-10 w-full' />
            <Skeleton className='h-10 w-full' />
          </div>
        ) : tableData && tableData.columns.length > 0 ? (
          <div className='space-y-4'>
            {/* 数据表格区域 */}
            <div className='border rounded-md overflow-x-auto max-w-full bg-background/50 relative'>
              {loadingData && (
                <div className='absolute inset-0 bg-background/40 backdrop-blur-[1px] flex items-center justify-center z-10'>
                  <RefreshCw className='size-5 text-primary animate-spin' />
                </div>
              )}
              <Table className='text-xs'>
                <TableHeader className='bg-muted/40 font-semibold sticky top-0'>
                  <TableRow>
                    {tableData.columns.map((col) => (
                      <TableHead
                        key={col}
                        className='font-semibold text-foreground py-2.5'
                      >
                        {col}
                      </TableHead>
                    ))}
                  </TableRow>
                </TableHeader>
                <TableBody>
                  {tableData.results && tableData.results.length > 0 ? (
                    tableData.results.map((row, rIndex) => (
                      <TableRow key={rIndex} className='hover:bg-muted/10'>
                        {tableData.columns.map((col) => (
                          <TableCell key={col} className='font-mono py-2'>
                            <span
                              className='truncate max-w-[200px] block'
                              title={formatCellValue(row[col])}
                            >
                              {formatCellValue(row[col])}
                            </span>
                          </TableCell>
                        ))}
                      </TableRow>
                    ))
                  ) : (
                    <TableRow>
                      <TableCell
                        colSpan={tableData.columns.length}
                        className='text-center py-10 text-muted-foreground'
                      >
                        表中无记录数据
                      </TableCell>
                    </TableRow>
                  )}
                </TableBody>
              </Table>
            </div>

            {/* 分页控制 */}
            <div className='flex items-center justify-between text-xs text-muted-foreground flex-wrap gap-2 pt-2 border-t border-dashed'>
              <div>
                总行数:{' '}
                <span className='font-mono text-foreground font-semibold'>
                  {formatNumber(tableData.total)}
                </span>{' '}
                条记录
              </div>
              <div className='flex items-center gap-2'>
                <Button
                  variant='outline'
                  size='sm'
                  className='h-7 px-2 text-[11px]'
                  onClick={() => handlePageChange(page - 1)}
                  disabled={page <= 1 || loadingData}
                >
                  上一页
                </Button>
                <span className='text-xs px-2 font-mono'>
                  第 {page} /{' '}
                  {Math.max(1, Math.ceil(tableData.total / pageSize))} 页
                </span>
                <Button
                  variant='outline'
                  size='sm'
                  className='h-7 px-2 text-[11px]'
                  onClick={() => handlePageChange(page + 1)}
                  disabled={
                    page >= Math.ceil(tableData.total / pageSize) || loadingData
                  }
                >
                  下一页
                </Button>
              </div>
            </div>
          </div>
        ) : (
          <div className='flex flex-col items-center justify-center py-10 text-muted-foreground'>
            <Layers className='size-8 opacity-45 mb-2' />
            <span className='text-xs'>未选择数据表或表结构无法加载</span>
          </div>
        )}
      </CardContent>
    </Card>
  );
}