const { getConnection } = require('./connection');

// 데이터 조회
async function getAllData(tableName = 'API_DATA') {
  let connection;
  try {
    connection = await getConnection();
    const result = await connection.execute(
      `SELECT * FROM ${tableName} ORDER BY CREATED_AT DESC`
    );
    return result.rows;
  } catch (err) {
    console.error('데이터 조회 실패:', err);
    throw err;
  } finally {
    if (connection) {
      await connection.close();
    }
  }
}

// 데이터 조회 (ID로)
async function getDataById(id, tableName = 'API_DATA') {
  let connection;
  try {
    connection = await getConnection();
    const result = await connection.execute(
      `SELECT * FROM ${tableName} WHERE ID = :id`,
      [id]
    );
    return result.rows[0];
  } catch (err) {
    console.error('데이터 조회 실패:', err);
    throw err;
  } finally {
    if (connection) {
      await connection.close();
    }
  }
}

// 데이터 삽입
async function insertData(data, tableName = 'API_DATA') {
  let connection;
  try {
    connection = await getConnection();
    const result = await connection.execute(
      `INSERT INTO ${tableName} (NAME, DESCRIPTION, DATA_VALUE) 
       VALUES (:name, :description, :dataValue)`,
      {
        name: data.name,
        description: data.description,
        dataValue: data.dataValue
      },
      { autoCommit: true }
    );
    return result.rowsAffected;
  } catch (err) {
    console.error('데이터 삽입 실패:', err);
    throw err;
  } finally {
    if (connection) {
      await connection.close();
    }
  }
}

// 데이터 업데이트
async function updateData(id, data, tableName = 'API_DATA') {
  let connection;
  try {
    connection = await getConnection();
    const result = await connection.execute(
      `UPDATE ${tableName} 
       SET NAME = :name, DESCRIPTION = :description, DATA_VALUE = :dataValue, UPDATED_AT = CURRENT_TIMESTAMP
       WHERE ID = :id`,
      {
        id: id,
        name: data.name,
        description: data.description,
        dataValue: data.dataValue
      },
      { autoCommit: true }
    );
    return result.rowsAffected;
  } catch (err) {
    console.error('데이터 업데이트 실패:', err);
    throw err;
  } finally {
    if (connection) {
      await connection.close();
    }
  }
}

// 데이터 삭제
async function deleteData(id, tableName = 'API_DATA') {
  let connection;
  try {
    connection = await getConnection();
    const result = await connection.execute(
      `DELETE FROM ${tableName} WHERE ID = :id`,
      [id],
      { autoCommit: true }
    );
    return result.rowsAffected;
  } catch (err) {
    console.error('데이터 삭제 실패:', err);
    throw err;
  } finally {
    if (connection) {
      await connection.close();
    }
  }
}

// 테이블 생성
async function createTable(tableName = 'API_DATA') {
  let connection;
  try {
    connection = await getConnection();
    
    // 테이블이 존재하는지 확인
    const checkTable = await connection.execute(
      `SELECT COUNT(*) as count FROM user_tables WHERE table_name = :tableName`,
      [tableName.toUpperCase()]
    );
    
    if (checkTable.rows[0][0] === 0) {
      // 테이블 생성
      await connection.execute(
        `CREATE TABLE ${tableName} (
          ID NUMBER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
          NAME VARCHAR2(100) NOT NULL,
          DESCRIPTION VARCHAR2(500),
          DATA_VALUE CLOB,
          CREATED_AT TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
          UPDATED_AT TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )`,
        [],
        { autoCommit: true }
      );
      console.log(`테이블 ${tableName}이 생성되었습니다.`);
    } else {
      console.log(`테이블 ${tableName}이 이미 존재합니다.`);
    }
  } catch (err) {
    console.error('테이블 생성 실패:', err);
    throw err;
  } finally {
    if (connection) {
      await connection.close();
    }
  }
}

module.exports = {
  getAllData,
  getDataById,
  insertData,
  updateData,
  deleteData,
  createTable
};