package com.sw.platecabinet.utils

import android.content.Context
import android.net.ConnectivityManager
import android.net.NetworkCapabilities
import com.sw.platecabinet.ENVIRONMENTS
import java.net.Inet4Address
import java.net.InetAddress
import java.net.NetworkInterface

/**
 * 网络状态只读提供器：连通性、本机 IP、业务环境名。
 */
object NetStatusProvider {

    /** 连通性摘要（离线/WiFi/蜂窝/以太网/未知） */
    fun connectivitySummary(context: Context): String {
        val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager
            ?: return "未知"
        val network = cm.activeNetwork ?: return "离线"
        val caps = cm.getNetworkCapabilities(network) ?: return "离线"
        return when {
            !caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) -> "离线(无外网)"
            caps.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET) -> "以太网"
            caps.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) -> "WiFi"
            caps.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) -> "蜂窝"
            else -> "已连接"
        }
    }

    /** 本机 IPv4 地址（取首个非回环地址，无则返回"未知"） */
    fun localIpv4(): String {
        return try {
            val addresses = mutableListOf<InetAddress>()
            val interfaces = NetworkInterface.getNetworkInterfaces() ?: return "未知"
            for (nif in interfaces) {
                val addrs = nif.inetAddresses ?: continue
                for (addr in addrs) addresses.add(addr)
            }
            addresses.firstOrNull { it is Inet4Address && !it.isLoopbackAddress }?.hostAddress ?: "未知"
        } catch (e: Exception) {
            "未知"
        }
    }

    /** 由 baseUrl 反查预设环境名，未匹配返回"自定义" */
    fun envName(baseUrl: String): String {
        return ENVIRONMENTS.firstOrNull { it.url == baseUrl }?.name ?: "自定义"
    }
}