import 'dart:convert';
import 'dart:io';

import 'package:awsparser/awsparser.dart';
import 'package:dio/dio.dart';

Future<void> main(List<String> arguments) async {
  print(">> WELCOME <<");
  print(">> Downloading AWS IP Range list..");
  // First, download the AWS IP Ranges config
  Dio dio = new Dio();
  Response<dynamic> awsResponse =
      await dio.get("https://ip-ranges.amazonaws.com/ip-ranges.json");

  if (awsResponse.statusCode! == 200) {
    // Get body as string
    AWSJson aws = AWSJson.parse(awsResponse.data as Map<String, dynamic>);

    print(">> Generating IP blocklist");

    String blockListv4 = "";
    String blockListv6 = "";

    for (var entry in aws.prefixes) {
      blockListv4 += "${entry.ip_prefix} AWS IPv4\n";
    }
    for (var entry in aws.ipv6_prefixes) {
      blockListv6 += "${entry.ipv6_prefix} AWS IPv6\n";
    }

    print(">> Stripping trailing newline");
    blockListv4 = blockListv4.trim();
    blockListv6 = blockListv6.trim();

    print(">> Report complete");
    print(">> Saving to ipv4_ranges.txt");

    File fi = File("ipv4_ranges.txt");
    await fi.open(mode: FileMode.write);
    await fi.writeAsString(blockListv4);

    print(">> Saving to ipv6_ranges.txt");
    fi = File("ipv6_ranges.txt");
    await fi.open(mode: FileMode.write);
    await fi.writeAsString(blockListv6);

    print(">> Goodbye!");
  } else {
    print("/!\\ FATAL ERROR /!\\ Failed to download the IP Range list");
  }
}