//
//  SDLIPAddress.swift
//  Tun
//
//  Created by 安礼成 on 2024/3/4.
//

import Foundation

struct SDLNetAddress {
    let ip: UInt32
    let maskLen: UInt8
    
    // ip地址
    var ipAddress: String {
        return intToIpAddress(self.ip)
    }
    
    // 掩码
    var maskAddress: String {
        let len0 = 32 - maskLen
        let num: UInt32 = (0xFFFFFFFF >> len0) << len0
        
        return intToIpAddress(num)
    }
    
    // 网络地址
    var networkAddress: String {
        let len0 = 32 - maskLen
        let mask: UInt32 = (0xFFFFFFFF >> len0) << len0
        
        return intToIpAddress(self.ip & mask)
    }
    
    init(ip: UInt32, maskLen: UInt8) {
        self.ip = ip
        self.maskLen = maskLen
    }
    
    private func intToIpAddress(_ num: UInt32) -> String {
        let ip0 = (UInt8) (num >> 24 & 0xFF)
        let ip1 = (UInt8) (num >> 16 & 0xFF)
        let ip2 = (UInt8) (num >> 8 & 0xFF)
        let ip3 = (UInt8) (num & 0xFF)
        
        return "\(ip0).\(ip1).\(ip2).\(ip3)"
    }
    
}