'use client'

import { useEffect } from 'react'
import { useParams, useRouter } from 'next/navigation'
import dynamic from 'next/dynamic'
import { trpc } from '@/lib/trpc/client'
import { Button } from '@/components/ui/button'
import { Skeleton } from '@/components/ui/skeleton'
import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert'
import {
  ArrowLeft,
  Download,
  ExternalLink,
  AlertCircle,
} from 'lucide-react'

const ResourceRenderer = dynamic(
  () => import('@/components/shared/resource-renderer').then((mod) => mod.ResourceRenderer),
  {
    ssr: false,
    loading: () => (
      <div className="mx-auto max-w-3xl min-h-[200px] rounded-lg border bg-muted/20 animate-pulse" />
    ),
  }
)

export default function MentorResourceDetailPage() {
  const params = useParams()
  const router = useRouter()
  const resourceId = params.id as string

  const { data: resource, isLoading, error } = trpc.learningResource.get.useQuery({ id: resourceId })
  const logAccess = trpc.learningResource.logAccess.useMutation()
  const utils = trpc.useUtils()

  // Log access on mount
  useEffect(() => {
    if (resourceId) {
      logAccess.mutate({ id: resourceId })
    }
  }, [resourceId])

  const handleDownload = async () => {
    try {
      const { url } = await utils.learningResource.getDownloadUrl.fetch({ id: resourceId })
      window.open(url, '_blank')
    } catch {
      // silently fail
    }
  }

  if (isLoading) {
    return (
      <div className="space-y-6">
        <Skeleton className="h-8 w-20" />
        <div className="mx-auto max-w-3xl space-y-4">
          <Skeleton className="h-10 w-2/3" />
          <Skeleton className="h-6 w-1/3" />
          <Skeleton className="h-px w-full" />
          <Skeleton className="h-64 w-full" />
        </div>
      </div>
    )
  }

  if (error || !resource) {
    return (
      <div className="space-y-6">
        <Alert variant="destructive">
          <AlertCircle className="h-4 w-4" />
          <AlertTitle>Resource not found</AlertTitle>
          <AlertDescription>
            This resource may have been removed or you don&apos;t have access.
          </AlertDescription>
        </Alert>
        <Button onClick={() => router.back()}>
          <ArrowLeft className="mr-2 h-4 w-4" />
          Back
        </Button>
      </div>
    )
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <Button variant="ghost" className="-ml-4" onClick={() => router.back()}>
          <ArrowLeft className="mr-2 h-4 w-4" />
          Back
        </Button>
        <div className="flex items-center gap-2">
          {resource.externalUrl && (
            <a href={resource.externalUrl} target="_blank" rel="noopener noreferrer">
              <Button variant="outline" size="sm">
                <ExternalLink className="mr-2 h-4 w-4" />
                Open Link
              </Button>
            </a>
          )}
          {resource.objectKey && (
            <Button variant="outline" size="sm" onClick={handleDownload}>
              <Download className="mr-2 h-4 w-4" />
              Download
            </Button>
          )}
        </div>
      </div>

      {/* Content */}
      <ResourceRenderer
        title={resource.title}
        description={resource.description}
        contentJson={resource.contentJson}
      />
    </div>
  )
}
