const db = require('./db')
const uuid = require('uuid')
const _ = require('lodash/fp')
const pgp = require('pg-promise')()

function getAvailablePromoCodes () {
  const sql = `SELECT * FROM coupons WHERE soft_deleted=false`
  return db.any(sql)
}

function getPromoCode (code) {
  const sql = `SELECT * FROM coupons WHERE code=$1 AND soft_deleted=false`
  return db.oneOrNone(sql, [code])
}

function createPromoCode (code, discount) {
  const sql = `INSERT INTO coupons (id, code, discount) VALUES ($1, $2, $3) RETURNING *`
  return db.one(sql, [uuid.v4(), code, discount])
}

function deletePromoCode (id) {
  const sql = `UPDATE coupons SET soft_deleted=true WHERE id=$1`
  return db.none(sql, [id])
}

function getNumberOfAvailablePromoCodes () {
  const sql = `SELECT COUNT(id) FROM coupons WHERE soft_deleted=false`
  return db.one(sql).then(res => res.count)
}

function getAvailableIndividualDiscounts () {
  const sql = `SELECT * FROM individual_discounts WHERE soft_deleted=false`
  return db.any(sql).then(res => _.map(it => ({
    id: it.id,
    customerId: it.customer_id,
    discount: it.discount
  }), res))
}

function getCustomerActiveIndividualDiscount (customerId) {
  const sql = `SELECT * FROM individual_discounts WHERE customer_id=$1 AND soft_deleted=false LIMIT 1`
  return db.oneOrNone(sql, [customerId]).then(res => {
    if (!_.isNil(res)) {
      return {
        id: res.id,
        customerId: res.customer_id,
        discount: res.discount
      }
    }
    return res
  })
}

function createIndividualDiscount (customerId, discount) {
  const sql = `INSERT INTO individual_discounts (id, customer_id, discount) VALUES ($1, $2, $3)`
  return db.none(sql, [uuid.v4(), customerId, discount])
}

function deleteIndividualDiscount (id) {
  const sql = `UPDATE individual_discounts SET soft_deleted=true WHERE id=$1`
  return db.none(sql, [id])
}

module.exports = {
  getAvailablePromoCodes,
  getPromoCode,
  createPromoCode,
  deletePromoCode,
  getNumberOfAvailablePromoCodes,
  getAvailableIndividualDiscounts,
  getCustomerActiveIndividualDiscount,
  createIndividualDiscount,
  deleteIndividualDiscount
}