const pg = require('../pg')
const joinjs = require('join-js').default;
const debug = require('debug')('sos:db:item')
const mappings = require('../mappings')

const sharp = require('sharp')

const item = module.exports = {}

item.findAll = async () => {
  const query = 'select * from v_item'

  debug(query);

  const {rows} = await pg.query(query)
  return joinjs.map(rows, mappings, 'itemMap', 'item_');
}

item.findById = async (item_uuid) => {
  const query = {
    text: 'select * from v_item where item_uuid = $1',
    values: [
      item_uuid
    ]
  }

  debug(query);

  const {rows} = await pg.query(query)
  return joinjs.map(rows, mappings, 'itemMap', 'item_')[0];
}

item.findBySlug = async (item_slug) => {
  const query = {
    text: 'select * from v_item where item_urlslug = $1',
    values: [
      item_slug
    ]
  }

  debug(query);

  const {rows} = await pg.query(query)
  return joinjs.map(rows, mappings, 'itemMap', 'item_')[0];
}

item.create = async (name, urlslug, description, price_cents, published) => {
  const query = {
    text: 'select * from public.create_item($1::text, $2::citext, $3::text, $4::integer, $5::boolean)',
    values: [
      name,
      urlslug,
      description,
      price_cents,
      published
    ]
  }

  debug(query)

  const {rows} = await pg.query(query)
  return joinjs.map(rows, mappings, 'itemMap', 'item_')[0]
}

item.addImage = async (item_uuid, image_buffer, uploader_uuid) => {

  // Default param chain: output as png
  const source = sharp(image_buffer).png()

  // All output images clone the source param chain, and then
  // resize before creating a buffer
  const [image, thumb] = await Promise.all([
    source.clone().toBuffer(),
    source.clone().resize({width: 300}).toBuffer()
  ])

  const query = {
    text: 'select * from public.add_image_to_item($1, $2, $3, $4, $5)',
    values: [
      item_uuid,
      image,
      thumb,
      'image/png',
      uploader_uuid
    ]
  }

  const {rows} = await pg.query(query)
  return joinjs.map(rows, mappings, 'itemMap', 'item_')[0]
}

const imageSizeQueries = {
  'large': 'select * from get_image_large($1)',
  'thumb': 'select * from get_image_thumb($1)'
}

item.getImage = async (image_uuid, size) => {
  if(!imageSizeQueries[size])
    throw new Error(`Cannot get unknown image size: "${size}"`)

  const query = {
    text: imageSizeQueries[size],
    values: [image_uuid]
  }

  const {rows} = await pg.query(query)
  return joinjs.map(rows, mappings, 'bareImageMap', 'image_')[0];
}