export const networkMapFilters=["all","online","degraded","offline","unknown","jump-host","exit-node","home-router"] as const
export type NetworkMapFilter=typeof networkMapFilters[number]
export function readNetworkMapUrl(params:URLSearchParams){
 const server=params.get("server"),search=params.get("q")??"",filter=params.get("filter")??"all",dest=params.get("dest")??"services",wan=params.get("wan")
 let error:string|null=null
 if(["server","q","filter","dest","wan"].some(key=>params.getAll(key).length>1))error="В ссылке повторяется контекст карты."
 else if(server!==null&&!/^[a-zA-Z0-9_.:-]{1,64}$/.test(server))error="В ссылке указан некорректный сервер карты."
 else if(search.length>256)error="Поиск карты в ссылке слишком длинный."
 else if(!(networkMapFilters as readonly string[]).includes(filter))error="В ссылке указан неизвестный фильтр карты."
 else if(!["services","countries"].includes(dest))error="В ссылке указан неизвестный режим назначений."
 else if(wan!==null&&(!server||!/^\d{1,4}$/.test(wan)))error="В ссылке указан некорректный аплинк карты."
 return {server,search,filter:filter as NetworkMapFilter,dest:dest as "services"|"countries",wan:wan===null?null:Number(wan),error}
}
export function patchNetworkMapUrl(params:URLSearchParams,values:Record<string,string|null>){
 const next=new URLSearchParams(params)
 for(const[key,value]of Object.entries(values)){if(value===null||value==="")next.delete(key);else next.set(key,value)}
 return "/network-map"+(next.size?"?"+next.toString():"")
}