'use client';

import * as React from 'react';
import { useRef, useState } from 'react';
import { useTheme } from 'next-themes';
import CodeMirror from '@uiw/react-codemirror';
import { sql } from '@codemirror/lang-sql';
import { toast } from 'sonner';
import { ArrowLeft, Play, RefreshCw, Terminal, Trash2 } from 'lucide-react';

import { Button } from '@/components/ui/button';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';
import type { ExecuteSQLResponse } from '@/lib/services/db-manage';
import { DbManageService } from '@/lib/services/db-manage';

/**
 * 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 SQLConsoleProps {
  dbType?: string; // "postgres" | "sqlite"
  onClose: () => void;
}

export function SQLConsole({ dbType, onClose }: SQLConsoleProps) {
  // SQL 控制台状态
  const [sqlQuery, setSqlQuery] = useState<string>('');
  const [executingSQL, setExecutingSQL] = useState<boolean>(false);
  const [sqlResult, setSqlResult] = useState<ExecuteSQLResponse | null>(null);
  const [sqlError, setSqlError] = useState<string | null>(null);

  // 拖拽与主题状态
  const containerRef = useRef<HTMLDivElement>(null);
  const [editorHeight, setEditorHeight] = useState<number>(240);
  const { resolvedTheme } = useTheme();
  const cmTheme = resolvedTheme === 'dark' ? 'dark' : 'light';

  const handleMouseDown = (e: React.MouseEvent) => {
    e.preventDefault();
    const startY = e.clientY;
    const startHeight = editorHeight;

    const handleMouseMove = (moveEvent: MouseEvent) => {
      if (!containerRef.current) return;
      const deltaY = moveEvent.clientY - startY;
      const containerHeight =
        containerRef.current.getBoundingClientRect().height;
      const newHeight = startHeight + deltaY;

      // Limit editor height between 80px and containerHeight - 80px
      if (newHeight > 80 && newHeight < containerHeight - 80) {
        setEditorHeight(newHeight);
      }
    };

    const handleMouseUp = () => {
      document.removeEventListener('mousemove', handleMouseMove);
      document.removeEventListener('mouseup', handleMouseUp);
    };

    document.addEventListener('mousemove', handleMouseMove);
    document.addEventListener('mouseup', handleMouseUp);
  };

  // 执行 SQL 查询
  const handleExecuteSQL = async () => {
    if (!sqlQuery.trim()) return;
    setExecutingSQL(true);
    setSqlResult(null);
    setSqlError(null);
    try {
      const result = await DbManageService.executeSQL(sqlQuery);
      setSqlResult(result);
      toast.success('SQL 执行成功');
    } catch (err) {
      setSqlError(err instanceof Error ? err.message : '未知执行错误');
      toast.error('SQL 执行失败');
    } finally {
      setExecutingSQL(false);
    }
  };

  // Preset SQL 选择器
  const handlePresetSQLChange = (query: string) => {
    setSqlQuery(query);
  };

  const handleClose = () => {
    setSqlResult(null);
    setSqlError(null);
    onClose();
  };

  return (
    <div className='py-6 px-1 space-y-6 w-full'>
      {/* 顶部控制与标题 */}
      <div className='flex items-center justify-between pb-2'>
        <div className='flex items-center gap-3'>
          <Button
            variant='outline'
            size='icon'
            className='h-8 w-8'
            onClick={handleClose}
          >
            <ArrowLeft className='size-4' />
          </Button>
          <div className='flex items-center gap-2'>
            <Terminal className='size-5 text-primary' />
            <div>
              <h1 className='text-2xl font-semibold tracking-tight'>
                SQL 查询终端
              </h1>
            </div>
          </div>
        </div>
        <div className='text-xs text-muted-foreground font-mono'>
          {dbType === 'postgres' ? 'PostgreSQL Connected' : 'SQLite Connected'}
        </div>
      </div>

      {/* 类似于 VS Code 的单个整体编辑器+结果区域，固定高度，有分水岭拖拽调整大小 */}
      <div
        ref={containerRef}
        className='w-full border border-border/40 bg-card/60 backdrop-blur-md rounded-lg overflow-hidden flex flex-col shadow-sm h-[calc(100vh-140px)] min-h-[500px]'
      >
        {/* 顶部编辑工具栏 */}
        <div className='flex items-center justify-between px-4 py-2 border-b bg-muted/40 shrink-0 gap-4 flex-wrap'>
          <div className='flex items-center gap-2'>
            <Terminal className='size-4 text-primary' />
            <span className='text-xs font-semibold'>SQL 编辑器</span>
          </div>

          <div className='flex items-center gap-3 flex-wrap'>
            {/* 快速模板 */}
            <div className='flex items-center gap-1.5'>
              <span className='text-[11px] text-muted-foreground'>
                快速模板:
              </span>
              <Select onValueChange={handlePresetSQLChange}>
                <SelectTrigger className='h-7 w-[180px] text-[11px] bg-background'>
                  <SelectValue placeholder='选择预设 SQL' />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value='SELECT * FROM users LIMIT 10;'>
                    查询用户 (SELECT users)
                  </SelectItem>
                  <SelectItem value='SELECT * FROM uploads LIMIT 10;'>
                    查询文件 (SELECT uploads)
                  </SelectItem>
                  <SelectItem value='SELECT * FROM task_executions ORDER BY created_at DESC LIMIT 10;'>
                    查询任务流水 (SELECT task_executions)
                  </SelectItem>
                  <SelectItem value='SELECT sqlite_version();'>
                    SQLite 版本 (SQLite only)
                  </SelectItem>
                  <SelectItem value='SELECT version();'>
                    PostgreSQL 版本 (Postgres only)
                  </SelectItem>
                </SelectContent>
              </Select>
            </div>

            {/* 控制按钮 */}
            <div className='flex items-center gap-1.5'>
              <Button
                variant='ghost'
                size='icon'
                className='h-7 w-7 text-muted-foreground hover:text-foreground'
                onClick={() => setSqlQuery('')}
                title='清空编辑器'
              >
                <Trash2 className='size-3.5' />
              </Button>
              <Button
                size='sm'
                className='h-7 px-3 gap-1 text-[11px]'
                onClick={handleExecuteSQL}
                disabled={executingSQL || !sqlQuery.trim()}
              >
                <Play className='size-3' />
                {executingSQL ? '运行中...' : '运行'}
              </Button>
            </div>
          </div>
        </div>

        {/* 上半区：编辑器输入框 */}
        <div
          style={{ height: editorHeight }}
          className='w-full overflow-hidden relative min-h-[100px] bg-background'
        >
          <CodeMirror
            value={sqlQuery}
            height='100%'
            extensions={[sql()]}
            theme={cmTheme}
            onChange={(value) => setSqlQuery(value)}
            className='h-full text-xs font-mono'
            basicSetup={{
              lineNumbers: true,
              foldGutter: true,
              dropCursor: true,
              allowMultipleSelections: false,
              indentOnInput: true,
            }}
          />
        </div>

        {/* 拖动分割线 */}
        <div
          onMouseDown={handleMouseDown}
          className='h-1.5 bg-border/60 hover:bg-primary/50 cursor-row-resize transition-colors flex items-center justify-center shrink-0 select-none z-10'
          title='拖动调整大小'
        >
          <div className='w-8 h-1 rounded bg-muted-foreground/30' />
        </div>

        {/* 下半区：查看结果 (可滑动查看) */}
        <div className='flex-1 min-h-[100px] flex flex-col overflow-hidden bg-muted/10'>
          {/* 结果栏工具提示 */}
          <div className='flex items-center justify-between px-4 py-1.5 border-b bg-muted/20 shrink-0 text-[11px] text-muted-foreground font-mono'>
            <span className='font-semibold'>执行输出</span>
            {sqlResult && (
              <span>
                类型: {sqlResult.type.toUpperCase()} | 耗时:{' '}
                {sqlResult.execution_time_ms} ms
              </span>
            )}
          </div>

          {/* 滚动结果内容 */}
          <div className='flex-1 overflow-auto p-4 min-h-0'>
            {executingSQL && (
              <div className='flex flex-col items-center justify-center h-full py-10 space-y-2'>
                <RefreshCw className='size-5 text-primary animate-spin' />
                <span className='text-xs text-muted-foreground'>
                  正在在数据库执行查询，请稍候...
                </span>
              </div>
            )}

            {sqlError && (
              <div className='bg-destructive/10 border border-destructive/20 text-destructive font-mono text-xs p-4 rounded-lg overflow-auto h-full max-h-[300px]'>
                <p className='font-semibold mb-1'>SQL 执行报错 (Error):</p>
                <pre className='whitespace-pre-wrap'>{sqlError}</pre>
              </div>
            )}

            {sqlResult && (
              <div className='h-full flex flex-col'>
                {sqlResult.type === 'select' &&
                  sqlResult.columns &&
                  sqlResult.columns.length > 0 && (
                    <div className='border rounded-md overflow-auto max-w-full max-h-full bg-background relative flex-1 min-h-0'>
                      <Table className='text-xs'>
                        <TableHeader className='bg-muted/40 font-semibold sticky top-0 z-10'>
                          <TableRow>
                            {sqlResult.columns.map((col) => (
                              <TableHead
                                key={col}
                                className='font-semibold text-foreground py-2'
                              >
                                {col}
                              </TableHead>
                            ))}
                          </TableRow>
                        </TableHeader>
                        <TableBody>
                          {sqlResult.results && sqlResult.results.length > 0 ? (
                            sqlResult.results.map((row, rIndex) => (
                              <TableRow
                                key={rIndex}
                                className='hover:bg-muted/10'
                              >
                                {sqlResult.columns!.map((col) => (
                                  <TableCell
                                    key={col}
                                    className='font-mono py-1.5'
                                  >
                                    <span
                                      className='truncate max-w-[240px] block'
                                      title={formatCellValue(row[col])}
                                    >
                                      {formatCellValue(row[col])}
                                    </span>
                                  </TableCell>
                                ))}
                              </TableRow>
                            ))
                          ) : (
                            <TableRow>
                              <TableCell
                                colSpan={sqlResult.columns.length}
                                className='text-center py-10 text-muted-foreground'
                              >
                                查询结果为空
                              </TableCell>
                            </TableRow>
                          )}
                        </TableBody>
                      </Table>
                    </div>
                  )}

                {sqlResult.type === 'exec' && (
                  <div className='bg-primary/5 border border-primary/10 text-primary-foreground font-mono text-xs p-6 rounded-lg text-center my-auto'>
                    <p className='text-foreground text-sm font-semibold'>
                      SQL 执行成功
                    </p>
                    <p className='text-muted-foreground mt-2'>
                      受影响行数: {sqlResult.affected_rows} 行，耗时{' '}
                      {sqlResult.execution_time_ms} 毫秒。
                    </p>
                  </div>
                )}
              </div>
            )}

            {!executingSQL && !sqlResult && !sqlError && (
              <div className='flex flex-col items-center justify-center h-full py-10 text-muted-foreground opacity-60'>
                <Terminal className='size-8 mb-2' />
                <span className='text-xs'>
                  编辑器就绪，请在上方编写 SQL 并运行查看结果
                </span>
              </div>
            )}
          </div>
        </div>
      </div>
    </div>
  );
}