const tariffTemplates = require('../tariffData.json')

module.exports = async function(pg, items) {
  await checkForPreviousItems(pg);

  const {itemCounts, itemImages} = await createItems(pg, items);

  await createShipment(pg, itemCounts);

  return itemImages.map(({uuid, name, images}) => ({
    uuid,
    name,
    images: images.map(image => image.replace(/^thumb\//, ''))
  }))
}

async function checkForPreviousItems(pg) {
  const items = await pg.item.findAll();

  if(items.length)
    throw new Error(`Cannot migrate items - ${items.length} items already exist!`)
}

async function createItems(pg, items) {
  const itemCounts = [];
  const itemImages = [];

  for (const item of items) {
    let tariffData = null;

    if(item.tags.includes('fauxpaws'))
      tariffData = tariffTemplates.sock;

    if(item.tags.includes('tinyequine'))
      tariffData = tariffTemplates.sock;

    if(!tariffData) {
      console.warn(`  Skipping item ${item.name} because of missing tariff data`)
      continue;
    }

    const newItem = await pg.item.create(
      item.name,
      item.urlslug,
      item.description
        .replace(/<(\/|)p>/g, '')
        .replace('&nbsp;', ' ')
        .trim(),
      item.price * 100,
      true,
      tariffData.hs_tariff_number,
      tariffData.customs_description,
      tariffData.origin_country,
      tariffData.weight
    )

    itemCounts.push({
      uuid: newItem.uuid,
      count: item.numberInStock
    })

    itemImages.push({
      uuid: newItem.uuid,
      name: newItem.name,
      images: [
        item.productImage,
        ...item.images
      ]
    })
  }

  return {itemCounts, itemImages};
}

async function createShipment(pg, itemCounts) {
  return await pg.shipment.createShipment(
    "Initial stock from db import",
    itemCounts.filter(({count}) => count > 0)
  );
}