import { z } from "zod"

export type ConfigRevisionSource = "apply" | "rollback" | "observed" | "copy"

export interface ConfigRevisionDto {
  id: string
  serverId: string
  section: "filters" | "recursive-routes" | "firewall" | "wireguard" | "gre" | "ipsec"
  source: ConfigRevisionSource
  fingerprint: string
  createdAt: string
  note: string | null
  itemCount: number
}

const revisionsSchema = z.object({ revisions: z.array(z.object({
  id: z.string().min(1),
  serverId: z.string().min(1),
  section: z.enum(["filters", "recursive-routes", "firewall", "wireguard", "gre", "ipsec"]),
  source: z.enum(["apply", "rollback", "observed", "copy"]),
  fingerprint: z.string(),
  createdAt: z.string().refine(value => Number.isFinite(Date.parse(value))),
  note: z.string().nullable(),
  itemCount: z.number().int().nonnegative(),
})) })

const sectionLabels: Record<ConfigRevisionDto["section"], string> = {
  filters: "Filters", "recursive-routes": "рекурсивных маршрутов", firewall: "Firewall",
  wireguard: "WireGuard", gre: "GRE", ipsec: "IPsec",
}

export function parseConfigRevisions(
  payload: unknown,
  serverId: string,
  section: ConfigRevisionDto["section"],
): ConfigRevisionDto[] {
  const result = revisionsSchema.safeParse(payload)
  if (!result.success || result.data.revisions.some(revision => revision.serverId !== serverId || revision.section !== section)) {
    throw new Error("Некорректный ответ истории " + sectionLabels[section])
  }
  return result.data.revisions
}