import React, { useEffect, useCallback, type ReactNode } from 'react'
import { createPortal } from 'react-dom'
import { AlertTriangle, HelpCircle } from 'lucide-react'
import { useTranslation } from '../../i18n'
import { useIsPhone } from '../../mobile/useIsPhone'
import { DialogTile, NEUTRAL_TINT, fs } from './DialogShell'

interface ConfirmDialogProps {
  isOpen: boolean
  onClose: () => void
  onConfirm: () => void
  title?: string
  message?: string
  confirmLabel?: string
  cancelLabel?: string
  danger?: boolean
  /** Extra content under the message, such as a list of what the action takes with it. */
  children?: ReactNode
}

// Callers commonly pass an async handler that reports its own failure and then
// rethrows. The dialog has already closed at that point, so the rejection would
// escape as an unhandled promise — absorb it here.
function runConfirm(onConfirm: () => void): void {
  const result = onConfirm() as unknown
  if (result && typeof (result as PromiseLike<unknown>).then === 'function') {
    void Promise.resolve(result).catch(() => {})
  }
}

export default function ConfirmDialog({
  isOpen,
  onClose,
  onConfirm,
  title,
  message,
  confirmLabel,
  cancelLabel,
  danger = true,
  children,
}: ConfirmDialogProps) {
  const { t } = useTranslation()
  const isPhone = useIsPhone()

  // Captured and stopped here: the question often opens over another dialog
  // (a Modal) that closes on Escape too, and one key press should only take
  // back the question, not the dialog it was asked from.
  const handleEsc = useCallback((e: KeyboardEvent) => {
    if (e.key !== 'Escape') return
    e.stopPropagation()
    onClose()
  }, [onClose])

  useEffect(() => {
    if (!isOpen) return
    document.addEventListener('keydown', handleEsc, true)
    return () => document.removeEventListener('keydown', handleEsc, true)
  }, [isOpen, handleEsc])

  if (!isOpen) return null

  return createPortal(
    <div
      // Backdrop only — Escape (above) and the Cancel button below are the
      // keyboard routes out of the dialog.
      role="presentation"
      className="fixed inset-0 z-[10000] flex items-center justify-center px-4 trek-backdrop-enter bg-[rgba(15,23,42,0.5)]"
      style={{ paddingBottom: 'var(--bottom-nav-h)' }}
      onClick={onClose}
    >
      {isPhone ? (
        <>
        {/* Capped at the viewport: a long list of what goes along scrolls on its
            own, and the two buttons below it always stay in reach. */}
        <div
          role="presentation"
          className={`trek-modal-enter flex max-h-[calc(100dvh-2rem-var(--bottom-nav-h,0px))] flex-col rounded-2xl shadow-2xl w-full ${children ? 'max-w-md' : 'max-w-sm'} p-6 bg-surface-card`}
          onClick={e => e.stopPropagation()}
        >
          <div className="flex min-h-0 items-start gap-4 overflow-y-auto overscroll-contain">
            {danger && (
              <div className="flex-shrink-0 w-10 h-10 rounded-full bg-danger-soft flex items-center justify-center">
                <AlertTriangle className="w-5 h-5 text-danger" />
              </div>
            )}
            <div className="flex-1 min-w-0">
              <h3 className="text-base font-semibold text-content">
                {title || t('common.confirm')}
              </h3>
              <p className="mt-1 text-sm text-content-secondary">
                {message}
              </p>
              {children}
            </div>
          </div>

          <div className="flex flex-none justify-end gap-3 mt-6">
            <button type="button"
              onClick={onClose}
              className="px-4 py-2 text-sm font-medium rounded-lg transition-colors text-content-secondary border border-edge-secondary"
            >
              {cancelLabel || t('common.cancel')}
            </button>
            <button type="button"
              onClick={() => { runConfirm(onConfirm); onClose() }}
              className={`px-4 py-2 text-sm font-medium rounded-lg transition-opacity hover:opacity-90 ${
                danger ? 'bg-danger text-white' : 'bg-accent text-accent-text'
              }`}
            >
              {confirmLabel || t('common.delete')}
            </button>
          </div>
        </div>
        </>
      ) : (
        // The desktop draws the question like the planner's dialogs: a head band
        // with its tile, the message below, the answers in a bar at the foot.
        <div
          role="presentation"
          className={`trek-modal-enter flex max-h-[calc(100dvh-2rem-var(--bottom-nav-h,0px))] w-full flex-col overflow-hidden rounded-[22px] bg-surface-card shadow-2xl ${children ? 'max-w-md' : 'max-w-sm'}`}
          onClick={e => e.stopPropagation()}
        >
          <div className={`flex flex-none items-center gap-3.5 px-6 pb-4 pt-5 ${danger ? 'bg-danger-soft' : ''}`} style={danger ? undefined : { background: NEUTRAL_TINT }}>
            <DialogTile>
              {danger
                ? <AlertTriangle size={20} strokeWidth={1.9} className="text-danger" />
                : <HelpCircle size={20} strokeWidth={1.9} className="text-content-muted" />}
            </DialogTile>
            <h3 className="m-0 min-w-0 flex-1 font-bold tracking-[-0.01em] text-content" style={fs(18, 'subtitle')}>
              {title || t('common.confirm')}
            </h3>
          </div>
          <div className="flex min-h-0 flex-col gap-3 overflow-y-auto overscroll-contain px-6 py-5">
            <p className="m-0 text-content-secondary" style={fs(13.5, 'body')}>{message}</p>
            {children}
          </div>
          <div className="flex flex-none items-center justify-end gap-2 border-t border-edge-faint px-6 py-3.5" style={fs(13, 'body')}>
            <button type="button" onClick={onClose}
              className="inline-flex items-center rounded-[10px] bg-surface-tertiary px-3.5 py-2 font-medium text-content hover:bg-surface-hover">
              {cancelLabel || t('common.cancel')}
            </button>
            <button type="button"
              onClick={() => { runConfirm(onConfirm); onClose() }}
              className={`inline-flex items-center rounded-[10px] px-4 py-2 font-medium hover:opacity-90 ${danger ? 'bg-danger text-white' : 'bg-accent text-accent-text'}`}
            >
              {confirmLabel || t('common.delete')}
            </button>
          </div>
        </div>
      )}
    </div>,
    document.body
  )
}