import type { Metadata } from 'next'
import { notFound } from 'next/navigation'
import { db } from '@/lib/db'
import { requireUser } from '@/lib/auth/current'
import { canEditCase } from '@/lib/access/caseWrite'
import { loadVisibleCase } from '@/lib/cases/service'
import { listDocuments, listTemplatesFor } from '@/lib/documents/service'
import { listAttachments } from '@/lib/files/service'
import { toAttachmentViews } from '@/lib/files/view'
import { de } from '@/lib/i18n/de'
import { DocumentList } from '@/components/documents/DocumentList'
import { NewDocument } from '@/components/documents/NewDocument'
import { Attachments } from '@/components/files/Attachments'

export const metadata: Metadata = { title: de.document.heading }
export const dynamic = 'force-dynamic'

/**
 * Was der Akte beiliegt: erzeugte Dokumente und hochgeladene Dateien.
 */
export default async function CaseDocumentsPage({
  params,
}: {
  params: Promise<{ caseNumber: string }>
}) {
  const user = await requireUser()
  const { caseNumber } = await params

  const akte = await loadVisibleCase(user.permissions, caseNumber)
  if (!akte) notFound()

  const canEdit = canEditCase(user.permissions, akte).ok

  const [documents, anhaenge, templates, levels] = await Promise.all([
    listDocuments(user.permissions, { caseId: akte.id }),
    listAttachments(user.permissions, { caseId: akte.id }),
    canEdit ? listTemplatesFor('CASE_DOCUMENT') : Promise.resolve([]),
    db.clearanceLevelConfig.findMany({ orderBy: { level: 'asc' } }),
  ])

  return (
    <div className="space-y-10">
      <section>
        <h2 className="font-condensed">{de.document.heading}</h2>
        <div className="mt-4 space-y-4">
          <DocumentList
            documents={documents}
            levelName={new Map(levels.map((l) => [l.level, l.name]))}
          />
          {canEdit ? (
            <NewDocument
              templates={templates}
              levels={levels.filter((l) => l.level <= user.permissions.clearanceLevel)}
              defaultLevel={Math.min(akte.classification, user.permissions.clearanceLevel)}
              caseNumber={akte.caseNumber}
            />
          ) : null}
        </div>
      </section>

      <section>
        <h2 className="font-condensed">{de.attachment.heading}</h2>
        <div className="mt-4">
          <Attachments
            target={{ caseNumber: akte.caseNumber }}
            topic={`case:${akte.id}`}
            initial={toAttachmentViews(anhaenge)}
            canUpload={canEdit}
            canRelease={user.permissions.isAdmin}
          />
        </div>
      </section>
    </div>
  )
}