import { useState } from 'react'
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
import { useBreadcrumb } from '../../hooks/useBreadcrumb'
import { breadcrumbConfig } from '../../config/breadcrumbConfig'
import {
  Bell,
  BellRing,
  Loader2,
  AlertCircle,
  Video,
  Download,
  RefreshCw,
  CheckCircle,
  XCircle,
  Info,
  Clock,
  Trash2,
} from 'lucide-react'
import { api, getErrorMessage, PaidContentNotification } from '../../lib/api'
import { formatRelativeTime, formatBytes, THUMB_CACHE_V } from '../../lib/utils'
import { notificationManager } from '../../lib/notificationManager'
import BundleLightbox from '../../components/paid-content/BundleLightbox'
import { PaidContentPost, PaidContentAttachment } from '../../lib/api'

interface MediaFile {
  file_path: string
  filename: string
  source?: string
  content_type?: string
  file_size?: number
  width?: number
  height?: number
  file_type?: string
  platform?: string
  post_id?: number | null
  post_content?: string
  post_date?: string
  duration?: number
  attachment_id?: number
  downloaded_at?: string
  file_token?: string
}

// Create a minimal post object from notification data for BundleLightbox
function createMinimalPost(notification: PaidContentNotification, mediaFiles: MediaFile[]): PaidContentPost {
  // Use post_content from the first media file if available (backend includes this)
  const firstMedia = mediaFiles[0]
  const postContent = firstMedia?.post_content || null
  const postDate = firstMedia?.post_date || notification.created_at

  return {
    id: notification.post_id || 0,
    creator_id: notification.creator_id || 0,
    post_id: String(notification.post_id || ''),
    title: null,
    content: postContent,
    published_at: postDate,
    added_at: notification.created_at,
    has_attachments: 1,
    attachment_count: mediaFiles.length,
    downloaded: 1,
    download_date: notification.created_at,
    is_favorited: 0,
    is_viewed: 0,
    is_pinned: 0,
    pinned_at: null,
    username: notification.username || firstMedia?.source || '',
    platform: notification.platform || firstMedia?.platform || '',
    service_id: '',
    display_name: notification.username || firstMedia?.source || null,
    profile_image_url: null,
    identity_id: null,
    attachments: [],
  }
}

// Convert notification media files to attachment format
function mediaFilesToAttachments(mediaFiles: MediaFile[]): PaidContentAttachment[] {
  return mediaFiles.map((mf, index) => ({
    id: mf.attachment_id || index,
    post_id: mf.post_id || 0,
    attachment_index: index,
    name: mf.filename,
    file_type: mf.file_type || (isVideoFile(mf.filename) ? 'video' : 'image'),
    extension: mf.filename.split('.').pop() || null,
    server_path: null,
    download_url: null,
    file_size: mf.file_size || null,
    width: mf.width || null,
    height: mf.height || null,
    duration: mf.duration || null,
    status: 'completed',
    local_path: mf.file_path,
    local_filename: mf.filename,
    file_hash: null,
    error_message: null,
    download_attempts: 0,
    downloaded_at: mf.downloaded_at || mf.post_date || null,
    created_at: mf.post_date || null,
  }))
}

function isVideoFile(filename: string): boolean {
  const ext = filename.split('.').pop()?.toLowerCase()
  return ['mp4', 'mov', 'avi', 'mkv', 'webm', 'm4v'].includes(ext || '')
}

import LazyThumbnail from '../../components/LazyThumbnail'

function NotificationIcon({ type }: { type: string }) {
  switch (type) {
    case 'new_content':
      return (
        <div className="p-2 rounded-lg bg-blue-100 dark:bg-blue-900/30">
          <Download className="w-4 h-4 text-blue-600 dark:text-blue-400" />
        </div>
      )
    case 'download_complete':
      return (
        <div className="p-2 rounded-lg bg-emerald-100 dark:bg-emerald-900/30">
          <CheckCircle className="w-4 h-4 text-emerald-600 dark:text-emerald-400" />
        </div>
      )
    case 'sync_complete':
      return (
        <div className="p-2 rounded-lg bg-violet-100 dark:bg-violet-900/30">
          <RefreshCw className="w-4 h-4 text-violet-600 dark:text-violet-400" />
        </div>
      )
    case 'error':
      return (
        <div className="p-2 rounded-lg bg-red-100 dark:bg-red-900/30">
          <XCircle className="w-4 h-4 text-red-600 dark:text-red-400" />
        </div>
      )
    default:
      return (
        <div className="p-2 rounded-lg bg-slate-100 dark:bg-slate-900/30">
          <Info className="w-4 h-4 text-slate-600 dark:text-slate-400" />
        </div>
      )
  }
}

export default function PaidContentNotifications() {
  useBreadcrumb(breadcrumbConfig['/paid-content/notifications'])

  const queryClient = useQueryClient()
  const [lightboxNotification, setLightboxNotification] = useState<PaidContentNotification | null>(null)
  const [lightboxMediaFiles, setLightboxMediaFiles] = useState<MediaFile[]>([])
  const [lightboxIndex, setLightboxIndex] = useState<number>(0)

  const { data: notifications, isLoading } = useQuery<PaidContentNotification[]>({
    queryKey: ['paid-content-notifications'],
    queryFn: () => api.paidContent.getNotifications({}),
    refetchInterval: 30000,
  })

  const deleteNotificationMutation = useMutation({
    mutationFn: (id: number) => api.paidContent.deleteNotification(id),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['paid-content-notifications'] })
      notificationManager.success('Deleted', 'Notification removed')
    },
    onError: (error: unknown) => {
      notificationManager.error('Error', getErrorMessage(error))
    },
  })

  const totalCount = notifications?.length || 0

  // Calculate stats
  const stats = {
    total: totalCount,
    byType: notifications?.reduce((acc, n) => {
      acc[n.notification_type] = (acc[n.notification_type] || 0) + 1
      return acc
    }, {} as Record<string, number>) || {},
  }

  const getThumbnailUrl = (media: MediaFile) => {
    // Use ID-based endpoint if available (matches Feed), otherwise fall back to file path
    if (media.attachment_id) {
      return `/api/paid-content/files/thumbnail/${media.attachment_id}?size=large&${THUMB_CACHE_V}`
    }
    return media.file_token
      ? `/api/paid-content/thumbnail?t=${encodeURIComponent(media.file_token)}`
      : `/api/paid-content/thumbnail?file_path=${encodeURIComponent(media.file_path)}`
  }

  const openLightbox = (notification: PaidContentNotification, mediaFiles: MediaFile[], index: number) => {
    setLightboxNotification(notification)
    setLightboxMediaFiles(mediaFiles)
    setLightboxIndex(index)
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
        <div>
          <h1 className="text-2xl sm:text-3xl font-bold flex items-center gap-2 sm:gap-3">
            <BellRing className="w-8 h-8 text-violet-500" />
            Notification History
          </h1>
          <p className="text-slate-600 dark:text-slate-400 mt-1">
            {totalCount} notification{totalCount !== 1 ? 's' : ''}
          </p>
        </div>
      </div>

      {/* Stats Cards */}
      <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
        <div className="card-glass-hover rounded-xl p-4 border stat-card-green shadow-green-glow">
          <div className="flex items-center justify-between">
            <div>
              <p className="text-sm text-muted-foreground">Total</p>
              <p className="text-2xl font-bold text-emerald-600 dark:text-emerald-400">{stats.total}</p>
            </div>
            <div className="p-3 rounded-xl bg-emerald-500/20">
              <Bell className="w-6 h-6 text-emerald-600 dark:text-emerald-400" />
            </div>
          </div>
        </div>

        <div className="card-glass-hover rounded-xl p-4 border stat-card-purple shadow-purple-glow">
          <div className="flex items-center justify-between">
            <div>
              <p className="text-sm text-muted-foreground">Sync Complete</p>
              <p className="text-2xl font-bold text-violet-600 dark:text-violet-400">
                {stats.byType['sync_complete'] || 0}
              </p>
            </div>
            <div className="p-3 rounded-xl bg-violet-500/20">
              <RefreshCw className="w-6 h-6 text-violet-600 dark:text-violet-400" />
            </div>
          </div>
        </div>

        <div className="card-glass-hover rounded-xl p-4 border stat-card-red shadow-red-glow">
          <div className="flex items-center justify-between">
            <div>
              <p className="text-sm text-muted-foreground">Errors</p>
              <p className="text-2xl font-bold text-red-600 dark:text-red-400">
                {stats.byType['error'] || 0}
              </p>
            </div>
            <div className="p-3 rounded-xl bg-red-500/20">
              <AlertCircle className="w-6 h-6 text-red-600 dark:text-red-400" />
            </div>
          </div>
        </div>
      </div>

      {/* Notifications List */}
      <div className="space-y-3">
        {isLoading ? (
          <div className="flex items-center justify-center py-12">
            <Loader2 className="w-8 h-8 animate-spin text-primary" />
          </div>
        ) : !notifications || notifications.length === 0 ? (
          <div className="card-glass-hover rounded-xl p-12 text-center">
            <Bell className="w-12 h-12 text-muted-foreground mx-auto mb-4 opacity-50" />
            <h3 className="text-lg font-semibold text-foreground">No notifications</h3>
            <p className="text-muted-foreground mt-1">
              No notifications yet
            </p>
          </div>
        ) : (
          notifications.map((notification) => {
            // Enrich media files with post_id from notification
            const mediaFiles = (notification.metadata?.media_files || []).map(mf => ({
              ...mf,
              post_id: notification.post_id,
              platform: (mf as any).platform || notification.platform,
              source: mf.source || notification.username,
            }))
            const hasMedia = mediaFiles.length > 0

            return (
              <div
                key={notification.id}
                className="card-glass-hover rounded-xl p-4"
              >
                <div className="flex flex-col gap-4">
                  <div className="flex items-start gap-4">
                    <NotificationIcon type={notification.notification_type} />
                    <div className="flex-1 min-w-0">
                      <div className="flex items-start justify-between">
                        <div>
                          <h3 className="font-semibold text-foreground">{notification.title}</h3>
                          <p className="text-sm text-muted-foreground mt-1 whitespace-pre-line">{notification.message}</p>
                        </div>
                        <div className="flex items-center gap-2 flex-shrink-0 ml-2">
                          <button
                            onClick={() => {
                              if (confirm('Delete this notification?')) {
                                deleteNotificationMutation.mutate(notification.id)
                              }
                            }}
                            className="p-1.5 rounded-lg hover:bg-red-100 dark:hover:bg-red-900/20 transition-colors"
                            title="Delete notification"
                          >
                            <Trash2 className="w-4 h-4 text-muted-foreground hover:text-red-500" />
                          </button>
                        </div>
                      </div>
                      <div className="mt-2 flex items-center gap-3 text-xs text-muted-foreground">
                        <span className="flex items-center gap-1">
                          <Clock className="w-3 h-3" />
                          <span>{formatRelativeTime(notification.created_at)}</span>
                        </span>
                        {notification.username && (
                          <span className="px-2 py-0.5 bg-secondary rounded-full">
                            @{notification.username}
                          </span>
                        )}
                        {notification.download_count !== undefined && notification.download_count > 0 && (
                          <span className="text-emerald-600 dark:text-emerald-400">
                            {notification.download_count} posts
                          </span>
                        )}
                        {notification.file_count !== undefined && notification.file_count > 0 && (
                          <span className="text-blue-600 dark:text-blue-400">
                            {notification.file_count} files
                          </span>
                        )}
                      </div>
                    </div>
                  </div>

                  {/* Media Thumbnails Grid */}
                  {hasMedia && (
                    <div className="pt-3 border-t border-border">
                      <div className="grid grid-cols-2 md:grid-cols-3 lg:grid-cols-4 xl:grid-cols-5 gap-4">
                        {mediaFiles.slice(0, 10).map((media: MediaFile, idx: number) => {
                          const isMediaVideo = isVideoFile(media.filename)
                          return (
                            <div
                              key={idx}
                              className={`relative ${isMediaVideo ? 'aspect-video' : 'aspect-square'} cursor-pointer group rounded-lg overflow-hidden border-2 border-border hover:border-primary transition-colors`}
                              onClick={() => openLightbox(notification, mediaFiles, idx)}
                            >
                              <LazyThumbnail
                                src={getThumbnailUrl(media)}
                                alt={media.filename}
                                className="w-full h-full object-cover"
                              />

                              {/* Video badge - top left with icon and duration */}
                              {isMediaVideo && (
                                <div className="absolute top-1 left-1 bg-black/60 text-white rounded px-1.5 py-0.5 text-xs">
                                  <Video className="w-3 h-3 inline mr-1" />
                                  {media.duration ? `${Math.floor(media.duration / 60)}:${(media.duration % 60).toString().padStart(2, '0')}` : 'Video'}
                                </div>
                              )}

                              {/* Hover overlay with file info */}
                              <div className="absolute inset-x-0 bottom-0 bg-gradient-to-t from-black/80 to-transparent p-2 opacity-0 group-hover:opacity-100 transition-opacity">
                                <div className="text-white text-xs truncate">
                                  {media.filename}
                                </div>
                                <div className="text-white/70 text-xs flex items-center space-x-2">
                                  {media.file_size && <span>{formatBytes(media.file_size)}</span>}
                                  {media.width && media.height && <span>{media.width}×{media.height}</span>}
                                </div>
                              </div>
                            </div>
                          )
                        })}
                        {mediaFiles.length > 10 && (
                          <div
                            className="relative aspect-square cursor-pointer rounded-lg overflow-hidden border-2 border-border bg-secondary flex items-center justify-center"
                            onClick={() => openLightbox(notification, mediaFiles, 10)}
                          >
                            <span className="text-2xl font-bold text-muted-foreground">
                              +{mediaFiles.length - 10}
                            </span>
                          </div>
                        )}
                      </div>
                    </div>
                  )}
                </div>
              </div>
            )
          })
        )}
      </div>

      {/* Notification Types Legend */}
      <div className="bg-card rounded-xl border border-border p-4">
        <h3 className="text-sm font-medium text-foreground mb-3">Notification Types</h3>
        <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
          <div className="flex items-center gap-2">
            <NotificationIcon type="new_content" />
            <span className="text-sm text-muted-foreground">New Content</span>
          </div>
          <div className="flex items-center gap-2">
            <NotificationIcon type="download_complete" />
            <span className="text-sm text-muted-foreground">Download Complete</span>
          </div>
          <div className="flex items-center gap-2">
            <NotificationIcon type="sync_complete" />
            <span className="text-sm text-muted-foreground">Sync Complete</span>
          </div>
          <div className="flex items-center gap-2">
            <NotificationIcon type="error" />
            <span className="text-sm text-muted-foreground">Error</span>
          </div>
        </div>
      </div>

      {/* BundleLightbox */}
      {lightboxNotification && lightboxMediaFiles.length > 0 && (
        <BundleLightbox
          post={createMinimalPost(lightboxNotification, lightboxMediaFiles)}
          attachments={mediaFilesToAttachments(lightboxMediaFiles)}
          currentIndex={lightboxIndex}
          autoPlayVideo
          onNavigate={setLightboxIndex}
          onClose={() => {
            setLightboxNotification(null)
            setLightboxMediaFiles([])
          }}
        />
      )}
    </div>
  )
}
