import { useEffect, useMemo, useState } from 'react'
import { X } from 'lucide-react'
import type { Order, OrderTransaction, TransactionStatus, TransactionType } from '../services/orderService'
import { formatIrtPrice } from '../utils/irtPrice'
import modalStyles from './VariationsModal.module.css'
import styles from './OrderTransactionsModal.module.css'

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

const ANIMATION_MS = 220

function transactionTypeLabel(type: TransactionType) {
  switch (type) {
    case 'pos':
      return 'POS'
    case 'cash':
      return 'Cash'
    case 'transfer':
      return 'Transfer'
    case 'e_payment_gate':
      return 'E-payment gateway'
    default:
      return type
  }
}

function statusClass(status: TransactionStatus) {
  switch (status) {
    case 'completed':
      return styles.statusCompleted
    case 'failed':
      return styles.statusFailed
    case 'refunded':
      return styles.statusRefunded
    case 'pending':
    default:
      return styles.statusPending
  }
}

function formatDateTime(value: string) {
  const d = new Date(value)
  if (Number.isNaN(d.getTime())) return value
  return d.toLocaleString('en-US', {
    year: 'numeric',
    month: 'short',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
  })
}

function transactionDetails(transaction: OrderTransaction) {
  const rows: { label: string; value: string }[] = [
    { label: 'Status', value: transaction.status },
    { label: 'Date', value: formatDateTime(transaction.createdAt) },
  ]

  if (transaction.type === 'pos' && transaction.posType) {
    rows.push({ label: 'POS type', value: transaction.posType })
  }
  if (transaction.type === 'transfer') {
    if (transaction.transferAccount) {
      rows.push({ label: 'Account number', value: transaction.transferAccount })
    }
    if (transaction.transferRefNumber) {
      rows.push({ label: 'Ref code', value: transaction.transferRefNumber })
    }
  }
  if (transaction.type === 'e_payment_gate' && transaction.gatewayType) {
    rows.push({ label: 'Gateway', value: transaction.gatewayType })
  }
  if (transaction.notes) {
    rows.push({ label: 'Notes', value: transaction.notes })
  }

  return rows
}

export function OrderTransactionsModal({ open, order, onClose }: OrderTransactionsModalProps) {
  const [mounted, setMounted] = useState(open)
  const [closing, setClosing] = useState(false)

  const transactions = order?.transactions ?? []
  const totalPaid = useMemo(
    () => transactions.reduce((sum, tx) => sum + tx.amount, 0),
    [transactions],
  )

  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

  return (
    <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-transactions-title"
      >
        <div className={modalStyles.header}>
          <div>
            <h2 id="order-transactions-title" className={modalStyles.title}>
              Transaction details
            </h2>
            <p className={modalStyles.subtitle}>{order.orderNumber}</p>
          </div>
          <button type="button" className={modalStyles.closeBtn} onClick={onClose} aria-label="Close">
            <X size={18} />
          </button>
        </div>

        <div className={`${modalStyles.body} ${styles.body}`}>
          {transactions.length === 0 ? (
            <p className={styles.empty}>No payment transactions recorded for this order.</p>
          ) : (
            <ul className={styles.txList}>
              {transactions.map((transaction) => {
                const details = transactionDetails(transaction)
                return (
                  <li key={transaction.id} className={styles.txCard}>
                    <div className={styles.txHeader}>
                      <div className={styles.txType}>{transactionTypeLabel(transaction.type)}</div>
                      <div className={styles.txAmount}>{formatIrtPrice(transaction.amount)}</div>
                    </div>
                    <div className={styles.txMeta}>
                      {details.map((detail) => (
                        <div key={detail.label} className={styles.txMetaItem}>
                          {detail.label}:{' '}
                          {detail.label === 'Status' ? (
                            <span className={`${styles.statusBadge} ${statusClass(transaction.status)}`}>
                              {detail.value}
                            </span>
                          ) : (
                            <strong>{detail.value}</strong>
                          )}
                        </div>
                      ))}
                    </div>
                  </li>
                )
              })}
            </ul>
          )}

          <div className={styles.summary}>
            <span className={styles.summaryLabel}>
              {transactions.length} {transactions.length === 1 ? 'transaction' : 'transactions'}
            </span>
            <span className={styles.summaryValue}>{formatIrtPrice(totalPaid)}</span>
          </div>

          <div className={modalStyles.actions}>
            <button type="button" className={modalStyles.cancelBtn} onClick={onClose}>
              Close
            </button>
          </div>
        </div>
      </div>
    </div>
  )
}