import { ThemedText } from '@/components/ThemedText';
import { View } from 'react-native';
import { Button, ButtonText } from '@/components/ui/button';
import SQLite from 'react-native-sqlite-storage';
import { useEffect, useRef } from 'react';

SQLite.enablePromise(true);
// 打开数据库
const openDB = () => {
  return SQLite.openDatabase({
    name: 'test.db',
    location: 'default',
  })
};

// 创建表
const createTable = (db: SQLite.SQLiteDatabase) => {
  db.transaction(tx => {
    db.executeSql(
      'CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, age INTEGER)',
      []
    )
      .then(() => {
        console.log('表创建成功');
      })
      .catch(err => {
        console.error('表创建失败:', err);
      });
  });
};

// 插入数据
const insertData = (db: SQLite.SQLiteDatabase) => {
  db.transaction(tx => {
    db.executeSql('INSERT INTO users (name, age) VALUES (?,?)', ['John', 30])
      .then(() => {
        console.log('数据插入成功');
      })
      .catch(error => console.error('数据插入失败:', error));
  });
};

// 查询数据
const queryData = (db: SQLite.SQLiteDatabase) => {
  db.transaction(tx => {
    tx.executeSql('SELECT * FROM users', []).then(([_,result]) => {
      const rows = result.rows;
      for (let i = 0; i < rows.length; i++) {
          console.log('用户信息:', rows.item(i));
      }
  }).catch(error => console.error('数据查询失败:', error));
  });
};

export default function Mine() {
  const dbRef = useRef<SQLite.SQLiteDatabase>();
  // useEffect(() => {
  //   dbRef.current = openDB()
  // },[])
  return (
    <View className='gap-2 px-4'>
      <ThemedText>Database TEST</ThemedText>
      <Button onPress={() => {openDB().then((db)=> {
        console.log('connect success')
        dbRef.current = db
      }).catch((error)=> {
        console.log('connect fail', error)
      })}}>
        <ButtonText>CONNECT</ButtonText>
      </Button>
      <Button onPress={() => createTable(dbRef.current!)}>
        <ButtonText>CREATE TABLE</ButtonText>
      </Button>
      <Button onPress={() => insertData(dbRef.current!)}>
        <ButtonText>INSERT</ButtonText>
      </Button>
      <Button onPress={() => queryData(dbRef.current!)}>
        <ButtonText>QUERY</ButtonText>
      </Button>
    </View>
  );
}