const Service = require("egg").Service
const {v4: uuid} = require("uuid");

class DbService extends Service {
  async addOrUpdate(table, form) {
    let result
    if (!form.id) {//创建
      form.id = uuid()
      result = await this.app.mysql.insert(table, form)
    } else {//更新
      result = await this.app.mysql.update(table, form)
    }
    return result === 1 ? {code: 0, data: form.id} : {code: 1, data: null}
  }

  async delete(table, id) {
    await this.app.mysql.delete(table, {id})
    return {code: 0, data: null}
  }

  async detail(table, id) {
    const data = await this.app.mysql.get(table, {id})
    return {code: 0, data}
  }

  async list(table, params = {}) {
    let {current = 0, size = 10} = params
    delete params.size
    delete params.current
    delete params.total
    const records = await this.app.mysql.select(table, {
      where: params,
      limit: size || 10, // 返回数据量
      offset: Math.max(--current, 0), // 数据偏移量
    })
    const total = (await this.app.mysql.select(table, {where: params}))?.length || 0
    return {code: 0, data: {records, total}}
  }
}

module.exports = DbService