import { useEffect, useState } from 'react'
import { createPortal } from 'react-dom'
import { X } from 'lucide-react'
import { useT } from '../i18n/useT'
import type { Order } from '../services/orderService'
import { formatCellForDisplay } from '../lib/cellNumber'
import { formatIrtPrice } from '../utils/irtPrice'
import modalStyles from './VariationsModal.module.css'
import styles from './OrderItemsModal.module.css'

interface OrderItemsModalProps {
  open: boolean
  order: Order | null
  onClose: () => void
}

const ANIMATION_MS = 220

function displayName(order: Order) {
  const name = [order.customer.firstName, order.customer.lastName].filter(Boolean).join(' ').trim()
  return name || '—'
}

function formatVariantLabel(selections: Order['items'][number]['selections']) {
  if (!selections.length) return '—'
  return selections.map((s) => `${s.variationName}: ${s.value}`).join(' · ')
}

function totalQuantity(order: Order) {
  return order.items.reduce((sum, item) => sum + item.quantity, 0)
}

function asRecord(value: unknown): Record<string, unknown> | null {
  return value && typeof value === 'object' && !Array.isArray(value)
    ? (value as Record<string, unknown>)
    : null
}

function parseOrderShipping(shippingAddress: Record<string, unknown>) {
  const root = asRecord(shippingAddress) ?? {}
  const deliveryMode =
    root.deliveryMode === 'pickup' || root.deliveryMode === 'delivery'
      ? root.deliveryMode
      : root.province === 'Pickup'
        ? 'pickup'
        : 'delivery'
  const shipping = asRecord(root.shipping)
  const groupsRaw = Array.isArray(shipping?.groups) ? shipping.groups : []
  const groups = groupsRaw
    .map((entry) => {
      const row = asRecord(entry)
      if (!row) return null
      const groupId = typeof row.groupId === 'string' ? row.groupId : ''
      if (!groupId) return null
      return {
        groupId,
        title: typeof row.title === 'string' ? row.title : '',
        methodLabel: typeof row.methodLabel === 'string' ? row.methodLabel : null,
        amount: typeof row.amount === 'number' && Number.isFinite(row.amount) ? row.amount : 0,
        itemNames: Array.isArray(row.itemNames)
          ? row.itemNames.filter((name): name is string => typeof name === 'string')
          : [],
      }
    })
    .filter((group): group is NonNullable<typeof group> => Boolean(group))

  const addressParts = [
    typeof root.province === 'string' ? root.province : '',
    typeof root.city === 'string' ? root.city : '',
    typeof root.address === 'string' ? root.address : '',
    typeof root.postalCode === 'string' ? root.postalCode : '',
  ].filter((part) => part && part !== 'Pickup' && part !== 'Store' && part !== 'In-store pickup')

  return {
    deliveryMode,
    addressLine: addressParts.join(' · '),
    groups,
  }
}

export function OrderItemsModal({ open, order, onClose }: OrderItemsModalProps) {
  const t = useT()
  const [mounted, setMounted] = useState(open)
  const [closing, setClosing] = useState(false)

  useEffect(() => {
    if (open) {
      setMounted(true)
      setClosing(false)
    } else if (mounted) {
      setClosing(true)
      const timer = setTimeout(() => {
        setMounted(false)
        setClosing(false)
      }, ANIMATION_MS)
      return () => clearTimeout(timer)
    }
  }, [open, mounted])

  useEffect(() => {
    if (!mounted || closing) return
    const onKey = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose()
    }
    document.addEventListener('keydown', onKey)
    return () => document.removeEventListener('keydown', onKey)
  }, [mounted, closing, onClose])

  if (!mounted || !order) return null

  const itemCount = totalQuantity(order)

  return createPortal(
    <div
      className={`${modalStyles.overlay} ${closing ? modalStyles.overlayOut : modalStyles.overlayIn}`}
      onClick={onClose}
    >
      <div
        className={`${modalStyles.modal} ${styles.modalWide} ${closing ? modalStyles.modalOut : modalStyles.modalIn}`}
        onClick={(e) => e.stopPropagation()}
        role="dialog"
        aria-modal="true"
        aria-labelledby="order-items-title"
      >
        <div className={modalStyles.header}>
          <div>
            <h2 id="order-items-title" className={modalStyles.title}>
              {t('orderItems.title')}
            </h2>
            <p className={modalStyles.subtitle}>{order.orderNumber}</p>
          </div>
          <button
            type="button"
            className={modalStyles.closeBtn}
            onClick={onClose}
            aria-label={t('orderItems.close')}
          >
            <X size={18} />
          </button>
        </div>

        <div className={`${modalStyles.body} ${styles.body}`}>
          <div className={styles.metaRow}>
            <span className={styles.metaItem}>
              {t('orderItems.customer')}: <strong>{displayName(order)}</strong>
            </span>
            <span className={styles.metaItem}>
              {t('orderItems.phone')}:{' '}
              <strong>{formatCellForDisplay(order.customer.cellNumber)}</strong>
            </span>
            <span className={styles.metaItem}>
              {t('orderItems.items')}: <strong>{itemCount}</strong>
            </span>
          </div>

          {(() => {
            const shippingInfo = parseOrderShipping(order.shippingAddress)
            return (
              <div className={styles.shippingBlock}>
                <div className={styles.shippingSectionTitle}>{t('orderItems.delivery')}</div>
                {shippingInfo.deliveryMode === 'pickup' ? (
                  <p className={styles.addressText}>{t('orderItems.pickup')}</p>
                ) : shippingInfo.addressLine ? (
                  <p className={styles.addressText}>{shippingInfo.addressLine}</p>
                ) : null}

                {shippingInfo.groups.length > 0 ? (
                  <ul className={styles.shippingGroupList}>
                    {shippingInfo.groups.map((group) => (
                      <li key={group.groupId} className={styles.shippingGroupCard}>
                        <div className={styles.shippingGroupHeader}>
                          <span className={styles.shippingGroupTitle}>{group.title}</span>
                          <span className={styles.shippingGroupAmount}>
                            {group.amount > 0
                              ? formatIrtPrice(group.amount)
                              : t('orderItems.freeShipping')}
                          </span>
                        </div>
                        {group.methodLabel ? (
                          <div className={styles.shippingMethod}>{group.methodLabel}</div>
                        ) : null}
                        {group.itemNames.length > 0 ? (
                          <ul className={styles.shippingItemNames}>
                            {group.itemNames.map((name) => (
                              <li key={`${group.groupId}-${name}`}>{name}</li>
                            ))}
                          </ul>
                        ) : null}
                      </li>
                    ))}
                  </ul>
                ) : null}
              </div>
            )
          })()}

          {order.items.length === 0 ? (
            <p className={styles.empty}>{t('orderItems.empty')}</p>
          ) : (
            <div className={styles.tableBlock}>
              <div className={styles.tableHead}>
                <span aria-hidden="true" />
                <span>{t('orderItems.product')}</span>
                <span>{t('orderItems.qty')}</span>
                <span>{t('orderItems.unitPrice')}</span>
                <span>{t('orderItems.lineTotal')}</span>
              </div>
              <ul className={styles.itemList}>
                {order.items.map((item) => (
                  <li key={item.id} className={styles.itemRow}>
                    <div className={styles.itemThumb}>
                      {item.productImage ? (
                        <img src={item.productImage} alt="" />
                      ) : (
                        <div className={styles.itemThumbPlaceholder} />
                      )}
                    </div>
                    <div>
                      <div className={styles.itemTitle}>{item.productTitle}</div>
                      <div className={styles.itemVariant}>{formatVariantLabel(item.selections)}</div>
                      {item.variantSku && (
                        <div className={styles.itemSku}>
                          {t('orderItems.sku', { sku: item.variantSku })}
                        </div>
                      )}
                    </div>
                    <div className={styles.qtyCell}>{item.quantity}</div>
                    <div className={styles.unitCell}>{formatIrtPrice(item.unitPrice)}</div>
                    <div className={styles.totalCell}>{formatIrtPrice(item.lineTotal)}</div>
                  </li>
                ))}
              </ul>
            </div>
          )}

          <div className={styles.totalsBlock}>
            <div className={styles.totalsRow}>
              <span>{t('orderItems.subtotal')}</span>
              <span className={styles.totalsValue}>{formatIrtPrice(order.subtotal)}</span>
            </div>
            <div className={styles.totalsRow}>
              <span>{t('orderItems.shipping')}</span>
              <span className={styles.totalsValue}>
                {order.shippingTotal > 0
                  ? formatIrtPrice(order.shippingTotal)
                  : t('orderItems.freeShipping')}
              </span>
            </div>
            {order.discountTotal > 0 ? (
              <div className={styles.totalsRow}>
                <span>{t('orderItems.discount')}</span>
                <span className={styles.totalsValue}>{formatIrtPrice(order.discountTotal)}</span>
              </div>
            ) : null}
            <div className={`${styles.totalsRow} ${styles.totalsRowGrand}`}>
              <span>
                {t('orderItems.summary', {
                  count: itemCount,
                  itemsLabel:
                    itemCount === 1 ? t('orderItems.item') : t('orderItems.itemsPlural'),
                })}
              </span>
              <span className={styles.summaryValue}>{formatIrtPrice(order.total)}</span>
            </div>
          </div>

          <div className={modalStyles.actions}>
            <button type="button" className={modalStyles.cancelBtn} onClick={onClose}>
              {t('orderItems.close')}
            </button>
          </div>
        </div>
      </div>
    </div>,
    document.body,
  )
}