'use client'

import { useEffect, useRef } from 'react'
import Button from './Button'
import { formatDistanceToNow } from 'date-fns'
import { de } from 'date-fns/locale'

type Notification = {
  id: string
  text: string
  read: boolean
  actionType?: string
  actionData?: string
  createdAt?: string
}

type Props = {
  notifications: Notification[]
  markAllAsRead: () => void
  onSingleRead: (id: string) => void
  onClose: () => void
  onAction: (action: 'accept' | 'reject', invitationId: string) => void
  onClickNotification?: (notification: Notification) => void
  anchorRef?: React.RefObject<HTMLElement> // Glocke
}

export default function NotificationCenter({
  notifications,
  markAllAsRead,
  onSingleRead,
  onClose,
  onAction,
  onClickNotification,
  anchorRef
}: Props) {
  const panelRef = useRef<HTMLDivElement | null>(null)

  // EIN Outside-Click Listener, der sowohl Panel als auch Anchor ignoriert
  useEffect(() => {
    const onDocPointerDown = (e: PointerEvent) => {
      const t = e.target as Node
      if (panelRef.current?.contains(t)) return
      if (anchorRef?.current?.contains(t)) return
      onClose()
    }
    document.addEventListener('pointerdown', onDocPointerDown, { passive: true })
    return () => document.removeEventListener('pointerdown', onDocPointerDown)
  }, [onClose, anchorRef])

  return (
    <div
      ref={panelRef}
      className="absolute bottom-20 right-0 w-80 bg-white dark:bg-neutral-800 border border-gray-200 dark:border-neutral-700 rounded-lg shadow-xl overflow-hidden z-50"
    >
      {/* Kopfzeile */}
      <div className="p-2 flex justify-between items-center border-b border-gray-200 dark:border-neutral-700">
        <span className="font-semibold text-gray-800 dark:text-white">
          Benachrichtigungen
        </span>
        <Button
          title="Alle als gelesen markieren"
          onClick={markAllAsRead}
          variant="solid"
          color="blue"
          size="sm"
          className="p-2"
        >
          <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" className="w-4 h-4" fill="currentColor">
            <path d="M255.4 48.2c.2-.1.4-.2.6-.2s.4.1.6.2L460.6 194c2.1 1.5 3.4 3.9 3.4 6.5v13.6L291.5 355.7c-20.7 17-50.4 17-71.1 0L48 214.1v-13.6c0-2.6 1.2-5 3.4-6.5L255.4 48.2zM48 276.2L190 392.8c38.4 31.5 93.7 31.5 132 0L464 276.2V456c0 4.4-3.6 8-8 8H56c-4.4 0-8-3.6-8-8V276.2zM256 0c-10.2 0-20.2 3.2-28.5 9.1L23.5 154.9C8.7 165.4 0 182.4 0 200.5V456c0 30.9 25.1 56 56 56h400c30.9 0 56-25.1 56-56V200.5c0-18.1-8.7-35.1-23.4-45.6L284.5 9.1C276.2 3.2 266.2 0 256 0z" />
          </svg>
        </Button>
      </div>

      {/* Liste */}
      <div className="max-h-60 overflow-y-auto">
        {notifications.length === 0 ? (
          <div className="p-4 text-center text-gray-500 dark:text-neutral-400">
            Keine Benachrichtigungen
          </div>
        ) : (
          notifications.map((n) => {
            const needsAction =
              !n.read && (n.actionType === 'team-invite' || n.actionType === 'team-join-request')
            return (
              <div
                key={n.id}
                className="grid grid-cols-[auto_1fr_auto] items-center gap-2 py-3 px-2 border-b border-gray-200 dark:border-neutral-700 text-sm hover:bg-gray-50 dark:hover:bg-neutral-700 cursor-pointer"
                onClick={() => {
                  onClickNotification?.(n)
                  if (!n.read) onSingleRead(n.id)
                }}
              >
                <div className="flex items-center justify-center h-full">
                  <span className={`inline-block w-2 h-2 rounded-full ${n.read ? 'bg-transparent' : 'bg-red-500'}`} />
                </div>

                <div className="flex flex-col gap-1">
                  <span className={n.read ? 'text-gray-600 dark:text-neutral-400' : 'font-semibold text-gray-900 dark:text-white'}>
                    {n.text}
                  </span>
                  <span className="text-xs text-gray-400 dark:text-neutral-500">
                    {n.createdAt && formatDistanceToNow(new Date(n.createdAt), { addSuffix: true, locale: de })}
                  </span>
                </div>

                <div className="flex items-center gap-1">
                  {needsAction ? (
                    <>
                      <Button
                        onClick={(e) => { e.stopPropagation(); onAction('accept', n.actionData ?? n.id); onSingleRead(n.id) }}
                        className="px-2 py-1 text-xs font-medium rounded bg-green-600 text-white hover:bg-green-700"
                        color="green"
                        size="sm"
                      >
                        ✔
                      </Button>
                      <Button
                        onClick={(e) => { e.stopPropagation(); onAction('reject', n.actionData ?? n.id); onSingleRead(n.id) }}
                        className="px-2 py-1 text-xs font-medium rounded bg-red-600 text-white hover:bg-red-700"
                        color="red"
                        size="sm"
                      >
                        ✖
                      </Button>
                    </>
                  ) : (
                    !n.read && (
                      <Button
                        onClick={() => onSingleRead(n.id)}
                        title="Als gelesen markieren"
                        className="p-1 text-gray-400 hover:text-gray-700 dark:hover:text-white"
                        color="gray"
                        size="sm"
                      >
                        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" className="w-4 h-4" fill="currentColor">
                          <path d="M255.4 48.2c.2-.1.4-.2.6-.2s.4.1.6.2L460.6 194c2.1 1.5 3.4 3.9 3.4 6.5v13.6L291.5 355.7c-20.7 17-50.4 17-71.1 0L48 214.1v-13.6c0-2.6 1.2-5 3.4-6.5L255.4 48.2zM48 276.2L190 392.8c38.4 31.5 93.7 31.5 132 0L464 276.2V456c0 4.4-3.6 8-8 8H56c-4.4 0-8-3.6-8-8V276.2zM256 0c-10.2 0-20.2 3.2-28.5 9.1L23.5 154.9C8.7 165.4 0 182.4 0 200.5V456c0 30.9 25.1 56 56 56h400c30.9 0 56-25.1 56-56V200.5c0-18.1-8.7-35.1-23.4-45.6L284.5 9.1C276.2 3.2 266.2 0 256 0z" />
                        </svg>
                      </Button>
                    )
                  )}
                </div>
              </div>
            )
          })
        )}
      </div>
    </div>
  )
}