'use server'

import { revalidatePath } from 'next/cache'
import { z } from 'zod'
import { requireUser } from '@/lib/auth/current'
import { AccessError } from '@/lib/cases/service'
import { ConflictError, saveSection } from '@/lib/cases/sectionService'
import { de } from '@/lib/i18n/de'

const schema = z.object({
  caseNumber: z.string().min(1),
  fieldKey: z.string().min(1),
  value: z.unknown(),
  baseVersion: z.coerce.number().int().min(0),
  minClearance: z.coerce.number().int().min(0).max(5).optional(),
})

export type SaveSectionResult =
  | { ok: true; version: number }
  /** Kein stilles Überschreiben: die fremde Fassung kommt mit zurück. */
  | { ok: false; conflict: true; current: { value: unknown; version: number } }
  | { ok: false; conflict: false; error: string }

export async function saveSectionAction(input: unknown): Promise<SaveSectionResult> {
  const user = await requireUser()
  const parsed = schema.safeParse(input)
  if (!parsed.success) return { ok: false, conflict: false, error: de.case.errors.default! }

  try {
    const { version } = await saveSection(user.permissions, parsed.data)
    revalidatePath(`/faelle/${parsed.data.caseNumber}`)
    return { ok: true, version }
  } catch (error) {
    if (error instanceof ConflictError) {
      return {
        ok: false,
        conflict: true,
        current: { value: error.current.value, version: error.current.version },
      }
    }
    if (error instanceof AccessError) {
      return { ok: false, conflict: false, error: de.case.errors[error.code] ?? de.case.errors.default! }
    }
    console.error('[abschnitt] unerwartet', error)
    return { ok: false, conflict: false, error: de.case.errors.default! }
  }
}