import React, {useMemo} from 'react'
import {DateTime} from 'luxon'
import Link from 'next/link'

import styles from './style.module.css'

export default function OrderSummary({order, isAdmin}) {
  const items = useMemo(() => coalesceItems(order), [order])
  const totalShipping = useMemo(() => sumShippingPrice(order), [order])

  return (
    <>
      <section className={styles.summaryRow}>
        {items.length && (
          <div className={styles.summaryRowSection}>
            <h3>Contents:</h3>
            <section>
              <ul>
                {items.map(({count, item}) => (
                  <li key={item.uuid}>{count}x - {item.name}</li>
                ))}
              </ul>
            </section>
          </div>
        )}

        {order.address && (
          <div className={styles.summaryRowSection}>
            <h3>Address:</h3>
            <section>
              <pre>
                {order.address.name || order.address.company}<br/>
                {order.address.street1}<br/>
                {order.address.street2 && (<>{order.address.street2}<br/></>)}
                {order.address.city}, {order.address.state}, {order.address.zip}<br/>
                {order.address.country !== 'US' && order.address.country}
              </pre>
            </section>
          </div>
        )}

        <div className={styles.summaryRowSection}>
          <h3>Shipping:</h3>
          <section>
            <ShippingStatus order={order} totalShipping={totalShipping} delivery={order.delivery} isAdmin={isAdmin}/>
          </section>
        </div>
      </section>
    </>
  )

}

function coalesceItems(order) {
  const {transactions} = order

  let items = {}

  for(const trans of transactions)
    for(const {count, item} of trans.cart.items) {
      if(!items[item.uuid])
        items[item.uuid] = {
          count, item
        }
      else
        items[item.uuid].count += count
    }

  return Object.values(items)
}

function sumShippingPrice(order) {
  return order.transactions.map(trans => trans.shipping_price).reduce((a,b) => (b+a), 0)
}

const formatMoney = money => {
  if (money === undefined || money === null) return null;

  return '$' + (money / 100).toFixed(2)
}

function formatTime(time){
  return DateTime.fromISO(time).setZone('local').toFormat('LLLL dd')
}

function ShippingStatus({order, totalShipping, delivery, isAdmin}) {
  if(!delivery)
    return (
      <>
        {isAdmin && (<p>{formatMoney(totalShipping)} charged to customer</p>)}
        <p>Not yet shipped</p>
      </>
    )

  switch (delivery.type) {
    case 'easypost':
    case 'hand_shipped':
      return (
        <>
          {isAdmin && (
            <p>
              {formatMoney(totalShipping)} charged to customer<br/>
              {(delivery.price_cents && !delivery.easypost) && (<>{formatMoney(parseInt(delivery.price_cents, 10))} paid to ship<br/></>)}
              {delivery.easypost && (<>{formatMoney(parseFloat(delivery.easypost.selected_rate.rate) * 100)} paid to EasyPost</>)}
            </p>
          )}

          <p>
            Shipped
            {isAdmin && delivery.type === 'hand_shipped' && ' by hand '}
            {' '} on {formatTime(delivery.date_shipped)}
          </p>

          <p>
            Tracking number:<br/>
            <a href={`https://tools.usps.com/go/TrackConfirmAction?tLabels=${delivery.tracking_number}`}>{delivery.tracking_number}</a>
          </p>

          {isAdmin && delivery.type === 'easypost' && (
            <p>
              <Link href={`/admin/orders/${order.uuid}/label`}><a>View/print shipping label</a></Link>
            </p>
          )}
        </>
      )

    case 'hand_delivered':
      return (
        <>
          <p>Delivered {isAdmin && ' in person '} on {formatTime(delivery.date_delivered)}</p>
          {isAdmin && (
            <>
              <h4>Note:</h4>
              <pre>
                {delivery.description}
              </pre>
            </>
          )}
        </>
      )

    default:
      return <p>Error displaying shipment information</p>
  }
}