const pool = require('./index')

/**
 * 查询全部
 */
async function findAll(table) {
  const [rows] = await pool.query(
    `SELECT * FROM ${table}`
  )
  
  return rows
}

/**
 * 根据ID查询
 */
async function findById(table, id) {
  const [rows] = await pool.query(
    `SELECT * FROM ${table} WHERE id = ?`,
    [id]
  )
  
  return rows[0]
}

/**
 * 新增
 */
async function create(table, data) {
  const keys = Object.keys(data)
  const values = Object.values(data)
  
  const fields = keys.join(',')
  
  const placeholders = keys.map(() => '?').join(',')
  
  const sql = `
    INSERT INTO ${table}
    (${fields})
    VALUES (${placeholders})
  `
  
  const [result] = await pool.query(sql, values)
  
  return result
}

/**
 * 更新
 */
async function update(table, id, data) {
  const keys = Object.keys(data)
  const values = Object.values(data)
  
  const setStr = keys
    .map(key => `${key} = ?`)
    .join(',')
  
  const sql = `
    UPDATE ${table}
    SET ${setStr}
    WHERE id = ?
  `
  
  const [result] = await pool.query(
    sql,
    [...values, id]
  )
  
  return result
}

/**
 * 删除
 */
async function remove(table, id) {
  const [result] = await pool.query(
    `DELETE FROM ${table} WHERE id = ?`,
    [id]
  )
  
  return result
}

module.exports = {
  findAll,
  findById,
  create,
  update,
  remove
}