import 'dart:io';
import 'dart:typed_data';

import 'package:http/http.dart' as http;
import 'package:http/testing.dart';
import 'package:swarm/swarm.dart';
import 'package:test/test.dart';

void main() {
  late Directory tmpDir;

  setUp(() async {
    tmpDir = await Directory.systemTemp.createTemp('file_download_test_');
  });

  tearDown(() async {
    await tmpDir.delete(recursive: true);
  });

  FileDownloadActor makeActor(http.Client client) => FileDownloadActor(
        fileActor: FileActor(),
        httpClient: client,
      );

  test('returns FileDownloaded with correct savePath', () async {
    final client = MockClient(
      (_) async => http.Response.bytes([1, 2, 3], 200),
    );
    final path = '${tmpDir.path}/output.bin';
    final result = await makeActor(client).handle(
      DownloadFile(url: 'https://example.com/file', savePath: path),
    );
    expect(result, isA<FileDownloaded>());
    expect((result as FileDownloaded).savePath, equals(path));
  });

  test('saves correct bytes to disk', () async {
    final bytes = Uint8List.fromList([0xDE, 0xAD, 0xBE, 0xEF]);
    final client = MockClient(
      (_) async => http.Response.bytes(bytes, 200),
    );
    final path = '${tmpDir.path}/data.bin';
    await makeActor(client).handle(
      DownloadFile(url: 'https://example.com/file', savePath: path),
    );
    expect(await File(path).readAsBytes(), equals(bytes));
  });

  test('sends GET request to the correct URL', () async {
    http.Request? captured;
    final client = MockClient((request) async {
      captured = request;
      return http.Response.bytes([0], 200);
    });
    await makeActor(client).handle(
      DownloadFile(
        url: 'https://example.com/assets/image.png',
        savePath: '${tmpDir.path}/image.png',
      ),
    );
    expect(captured!.method, equals('GET'));
    expect(
      captured!.url.toString(),
      equals('https://example.com/assets/image.png'),
    );
  });

  test('non-2xx response throws', () async {
    for (final status in [400, 403, 404, 500]) {
      final client = MockClient(
        (_) async => http.Response.bytes([], status),
      );
      await expectLater(
        makeActor(client).handle(
          DownloadFile(
            url: 'https://example.com/file',
            savePath: '${tmpDir.path}/out.bin',
          ),
        ),
        throwsA(isA<Exception>()),
      );
    }
  });
}