/*
 * Copyright 2019,2021-2022 Soren Stoutner <soren@stoutner.com>.
 *
 * This file is part of Privacy Browser Android <https://www.stoutner.com/privacy-browser-android>.
 *
 * Privacy Browser Android is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Privacy Browser Android is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Privacy Browser Android.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.stoutner.privacybrowser.coroutines

import androidx.fragment.app.FragmentManager
import com.stoutner.privacybrowser.helpers.CheckPinnedMismatchHelper
import com.stoutner.privacybrowser.views.NestedScrollWebView

import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext

import java.lang.StringBuilder
import java.net.InetAddress
import java.net.UnknownHostException

object GetHostIpAddressesCoroutine {
    @JvmStatic
    fun getAddresses(domainName: String, nestedScrollWebView: NestedScrollWebView, supportFragmentManager: FragmentManager, pinnedMismatchString: String) {
        // Get the IP addresses using a coroutine.
        CoroutineScope(Dispatchers.Main).launch {
            // Get the IP addresses on the IO thread.
            withContext(Dispatchers.IO) {
                // Get an array with the IP addresses for the host.
                try {
                    // Initialize an IP address string builder.
                    val ipAddresses = StringBuilder()

                    // Get an array with all the IP addresses for the domain.
                    val inetAddressesArray = InetAddress.getAllByName(domainName)

                    // Add each IP address to the string builder.
                    for (inetAddress in inetAddressesArray) {
                        // Add a line break to the string builder if this is not the first IP address.
                        if (ipAddresses.isNotEmpty()) {
                            ipAddresses.append("\n")
                        }

                        // Add the IP address to the string builder.
                        ipAddresses.append(inetAddress.hostAddress)
                    }

                    // Store the IP addresses.
                    nestedScrollWebView.currentIpAddresses = ipAddresses.toString()
                } catch (exception: UnknownHostException) {
                    // Do nothing.
                }
            }
        }

        // Checked for pinned mismatches if there is pinned information and it is not ignored.
        if ((nestedScrollWebView.hasPinnedSslCertificate() || nestedScrollWebView.pinnedIpAddresses != "") && !nestedScrollWebView.ignorePinnedDomainInformation) {
            CheckPinnedMismatchHelper.checkPinnedMismatch(nestedScrollWebView, supportFragmentManager, pinnedMismatchString)
        }
    }
}