const mysql = require("mysql");
const dbConfig = require("../config/db");
const {v4: uuid} = require("uuid");
const dayjs = require("dayjs");
const chalk = require("chalk");
const query = sql => new Promise((resolve, reject) => {
  this.pool?.getConnection((err, conn) => {
    if (err) {
      reject(err)
    } else {
      conn.query(sql, (err, result) => {
        if (err) {
          reject(err)
        } else {
          conn.release()
          resolve(result)
        }
      })
    }
  })
});
const insert = ({table, form}) => {
  let sql
  if (form.id) {//编辑
    let arr = Object.entries(form).map(([e, v]) => {
      if (v) {
        if (typeof v == "object") {
          v = JSON.stringify(v)
          v = v.replace(/(')/g, "\\$1")
        }
      } else v = ''
      return `${e}='${v}'`
    })
    sql = `update ${table} set ${arr.join(",")} where id='${form.id}'`
  } else {//新增
    let cols = [], arr = []
    Object.entries(form).map(([e, v]) => {
      if (v) {
        cols.push(e)
        if (typeof v == "object") {
          v = JSON.stringify(v)
          v = v.replace(/(')/g, "\\$1")
        }
        arr.push(`'${v}'`)
      }
    })
    sql = `insert into ${table} (id,createTime,${cols.join(",")}) values('${uuid()}','${dayjs().format("YYYY-MM-DD HH:mm:ss")}',${arr.join(",")})`
  }
  return sql
}
module.exports = {
  pool: null,
  init: () => {
    this.pool = mysql.createPool(dbConfig)
    console.log(`${chalk.bgBlue.black(" DATABASE ")} 数据库已连接`)
  },
  query,
  list: ({table, search, con = 'name', sort}) => {
    //列表查询
    let total = 0, records = []
    if (table) {
      const {current, size = 10} = search, params = JSON.parse(JSON.stringify(search))
      const conValue = params[con] || ""
      delete params.current
      delete params.size
      delete params[con]
      const sqlCon = Object.keys(params).map(e => `and ${e}='${params[e]}'`).join(" ")
      return Promise.all([
        query(`select 1 from ${table} where ${con} like '%${conValue}%' ${sqlCon}`).then(res => {
          return total = res.length
        }),
        query(`select * from ${table}  where ${con} like '%${conValue}%' ${sqlCon} order by ${sort||'createTime'} desc limit ${((current-1)||0)*size},${size}`).then(res => {
          return records = res
        })
      ]).then(() => {
        return {records, total}
      })
    }
  },
  batchInsert({table, list}) {
    return query(list.map(form => insert({table, form})).join(";"))
  },
  addOrUpdate: ({table, form}) => {
    //新增和更新
    const sql = insert({table, form})
    return query(sql)
  },
  delete: ({table, ids}) => {
    ids = ids?.split(",")?.map(e => `'${e}'`)?.toString()
    return query(`delete from ${table} where id in (${ids})`)
  },
  detail: ({table, id}) => {
    return query(`select * from ${table} where id='${id}' limit 0,1`).then(res => res?.[0])
  },
  format: args => args.map(e => `${e.prop}`).join(" ")
}