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

import 'package:flutter_test/flutter_test.dart';

import 'fake_protocol_server.dart';

import 'package:mews/protocols/spartan.dart';

Uri open(String path, FakeSpartanServer server) =>
    Uri.parse('spartan://localhost:${server.port}$path');

void main() {
  late FakeSpartanServer server;
  late StreamSubscription<Socket> answers;
  final client = SpartanClient(timeout: const Duration(seconds: 5));

  tearDown(() async {
    await answers.cancel();
    await server.close();
  });

  test('a success answers with status, meta and body', () async {
    server = FakeSpartanServer();
    await server.start();
    var requested = '';
    answers = server.answer((line, upload, socket) {
      requested = line;
      socket.add(utf8.encode('2 text/gemini\r\nhello'));
    });

    final response = await client.fetch(open('/page', server));

    expect(response.status, 2);
    expect(response.meta, 'text/gemini');
    expect(utf8.decode(response.body!), 'hello');
    expect(requested, 'localhost /page 0');
  });

  test('an upload rides behind the request line', () async {
    server = FakeSpartanServer();
    await server.start();
    var requested = '';
    var uploaded = '';
    answers = server.answer((line, upload, socket) {
      requested = line;
      uploaded = utf8.decode(upload);
      socket.add(utf8.encode('2 text/gemini\r\nok'));
    });

    final response =
        await client.fetch(open('/echo', server), upload: utf8.encode('payload'));

    expect(response.status, 2);
    expect(requested, 'localhost /echo 7');
    expect(uploaded, 'payload');
  });

  test('a query is part of the path', () async {
    server = FakeSpartanServer();
    await server.start();
    var requested = '';
    answers = server.answer((line, upload, socket) {
      requested = line;
      socket.add(utf8.encode('2 text/gemini\r\nok'));
    });

    await client.fetch(open('/search?q=phones', server));

    expect(requested, 'localhost /search?q=phones 0');
  });

  test('a redirect is followed to the final address', () async {
    server = FakeSpartanServer();
    await server.start();
    final requests = <String>[];
    answers = server.answer((line, upload, socket) async {
      requests.add(line);
      if (line.contains('/here')) {
        socket.add(utf8.encode('3 ${open('/there', server)}\r\n'));
      } else {
        socket.add(utf8.encode('2 text/gemini\r\narrived'));
      }
    });

    final response = await client.fetch(open('/here', server));

    expect(response.status, 2);
    expect(utf8.decode(response.body!), 'arrived');
    expect(response.url.path, '/there');
    expect(requests, hasLength(2));
  });

  test('a redirect loop gives up after five hops', () async {
    server = FakeSpartanServer();
    await server.start();
    final requests = <String>[];
    answers = server.answer((line, upload, socket) async {
      requests.add(line);
      socket.add(utf8.encode('3 ${open('/loop', server)}\r\n'));
    });

    await expectLater(
      client.fetch(open('/loop', server)),
      throwsA(isA<SpartanTooManyRedirects>()),
    );
    expect(requests, hasLength(6));
  });

  test('an error status carries its message', () async {
    server = FakeSpartanServer();
    await server.start();
    answers = server.answer((line, upload, socket) =>
        socket.add(utf8.encode('4 Nothing lives here\r\n')));

    final response = await client.fetch(open('/gone', server));

    expect(response.status, 4);
    expect(response.meta, 'Nothing lives here');
    expect(response.body, isNull);
  });

  test('an unreachable host is one failure', () async {
    final nowhere = Uri.parse('spartan://localhost:1/');

    await expectLater(client.fetch(nowhere), throwsA(isA<SpartanException>()));
  });
}