letsmess.swift

final class NetworkUsers: URLRepresentable {
    let apiVersion: APIVersion
    let network: String
    
    init(apiVersion: APIVersion, network: String) {
        self.apiVersion = apiVersion
        self.network = network
    }
    
    func makeURL() throws -> URL {
        return try apiVersion.makeURL(forPath: "/networks/\(network)/users")
    }
}

enum APIVersion {
    case v1, v2, v3
    
    func makeURL(forPath path: String) throws -> URL {
        let endpoint: APIEndpoint
        
        switch self {
        case .v1:
            endpoint = .v1(path)
        case .v2:
            endpoint = .v2(path)
        case .v3:
            endpoint = .v3(path)
        }
        
        return try endpoint.makeURL()
    }
}

@dynamicMemberLookup
struct NetworkRoutes {
    let apiVersion: APIVersion
    let network: String
    
    var users: NetworkUsers {
        return NetworkUsers(apiVersion: apiVersion, network: network)
    }
    
    init(apiVersion: APIVersion, network: String) {
        self.apiVersion = apiVersion
        self.network = network
    }
    
    subscript<Route>(dynamicMember keyPath: KeyPath<Self, Route>) -> Route {
        return self[keyPath: keyPath]
    }
}

struct AllNetworkRoutes {
    let apiVersion: APIVersion
    
    subscript(id: String) -> NetworkRoutes {
        NetworkRoutes(apiVersion: apiVersion, network: id)
    }
    
    init(apiVersion: APIVersion) {
        self.apiVersion = apiVersion
    }
}

struct V2 {
    let networks = AllNetworkRoutes(apiVersion: .v2)
    
    init() {}
}

@dynamicMemberLookup
struct APIRoutes {
    subscript<Route>(dynamicMember keyPath: KeyPath<Self, Route>) -> Route {
        return self[keyPath: keyPath]
    }
    
    let v2 = V2()
    
    init() {}
}

let routes = APIRoutes()