import type { Server, VxlanTunnel } from "./data"

/** RouterOS string literals: https://help.mikrotik.com/docs/spaces/ROS/pages/47579229/Scripting */
export function quoteRosString(value: string): string {
  return '"' + value.replace(/[\\"$\x00-\x1f\x7f]/g, char => {
    if (char === "\\" || char === '"' || char === "$") return "\\" + char
    return "\\" + char.charCodeAt(0).toString(16).toUpperCase().padStart(2, "0")
  }) + '"'
}

const commentLine = (value: string) => value.replace(/[\r\n\x00-\x1f\x7f]/g, " ")

/** A configuration fragment, not a full RouterOS export: bridge/FDB are not available in this API. */
export function generateVxlanRsc(t: VxlanTunnel, servers: Record<string, Server>): string {
  const server = servers[t.serverId]
  const lines = [`# VXLAN — ${commentLine(t.name)} · VNI ${t.vni}`]
  if (server) lines.push(`# Сервер: ${commentLine(server.name)} (${commentLine(server.host)})`)
  lines.push("# RouterOS 7.x · интерфейс и статические VTEP; bridge/FDB не включены", "")
  const args = [
    `name=${quoteRosString(t.name)}`, `vni=${t.vni}`, `port=${t.dstPort}`,
    `arp=${quoteRosString(t.arpMode ?? (t.arpProxy ? "proxy-arp" : "enabled"))}`,
    `learning=${t.macLearning ? "yes" : "no"}`, `disabled=${t.enabled ? "no" : "yes"}`,
    `comment=${quoteRosString(t.comment)}`,
  ]
  if (t.vtepIp) args.push(`local-address=${quoteRosString(t.vtepIp)}`)
  lines.push("/interface/vxlan/add " + args.join(" "))
  for (const remote of t.remoteVteps) lines.push(`/interface/vxlan/vteps/add interface=${quoteRosString(t.name)} remote-ip=${quoteRosString(remote)}`)
  return lines.join("\n") + "\n"
}