import 'dart:convert';

import 'package:drift/drift.dart' show driftRuntimeOptions;
import 'package:drift/native.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:http/http.dart' as http;
import 'package:http/testing.dart';
import 'package:rippr/src/data/database.dart';
import 'package:rippr/src/domain/models.dart';
import 'package:rippr/src/telemetry/telemetry_uploader.dart';

/// Ported from `com.rippr.TelemetryUploaderTest`.
///
/// The Kotlin suite used MockWebServer plus an in-memory fake DAO. Here a `MockClient`
/// stands in for the network and a real in-memory Drift database stands in for the DAO —
/// closer to production, and still no device required.
void main() {
  late AppDatabase db;

  setUp(() {
    driftRuntimeOptions.dontWarnAboutMultipleDatabases = true;
    db = AppDatabase(NativeDatabase.memory());
  });

  tearDown(() async => db.close());

  Future<void> seed(int count) async {
    final tripId =
        await db.insertTrip(const Trip(startedAt: 1000, state: TripState.recording));
    final segmentId = await db.insertSegment(tripId, 1000);
    await db.insertPoints([
      for (var i = 0; i < count; i++)
        TrackPoint(
          tripId: tripId,
          segmentId: segmentId,
          timestamp: 1000 + i,
          latitude: 51.0,
          longitude: -114.0,
          speedKmh: 40,
          altitudeM: 1000,
        ),
    ]);
  }

  TelemetryUploader uploader({
    required http.Client client,
    String endpoint = 'https://example.test/ingest',
  }) =>
      TelemetryUploader(
        db: db,
        endpoint: endpoint,
        deviceId: 'device-abc',
        client: client,
      );

  test('an empty endpoint disables upload entirely', () async {
    var called = false;
    final client = MockClient((_) async {
      called = true;
      return http.Response('', 200);
    });

    final result = await uploader(client: client, endpoint: '').uploadPending();

    expect(result, isA<UploadDisabled>());
    expect(called, isFalse, reason: 'recording must work with no server at all');
  });

  test('a successful run marks points synced', () async {
    await seed(5);
    final client = MockClient((_) async => http.Response('{}', 200));

    final result = await uploader(client: client).uploadPending();

    expect(result, isA<UploadSuccess>());
    expect((result as UploadSuccess).uploaded, 5);
    expect(await db.countUnsynced(), 0);
  });

  test('a rejected batch leaves the backlog intact for retry', () async {
    await seed(5);
    final client = MockClient((_) async => http.Response('nope', 500));

    final result = await uploader(client: client).uploadPending();

    expect(result, isA<UploadFailed>());
    expect(await db.countUnsynced(), 5,
        reason: 'nothing may be marked synced when the server refused it');
  });

  test('a network error is swallowed and retried later', () async {
    await seed(3);
    final client = MockClient((_) async => throw http.ClientException('offline'));

    final result = await uploader(client: client).uploadPending();

    expect(result, isA<UploadFailed>());
    expect(await db.countUnsynced(), 3);
  });

  test('the payload carries trip and segment identity per point', () async {
    await seed(2);
    String? captured;
    final client = MockClient((req) async {
      captured = req.body;
      return http.Response('{}', 200);
    });

    await uploader(client: client).uploadPending();

    final json = jsonDecode(captured!) as Map<String, dynamic>;
    expect(json['device_id'], 'device-abc');
    final first = (json['points'] as List).first as Map<String, dynamic>;
    // Batches are drawn by id and can straddle a boundary, so identity travels with the
    // point rather than the batch.
    expect(first.containsKey('trip_id'), isTrue);
    expect(first.containsKey('segment_id'), isTrue);
  });

  test('a backlog larger than one batch is sent across several requests',
      () async {
    // Two full batches plus a remainder.
    await seed(uploadBatchSize * 2 + 7);
    var requests = 0;
    final client = MockClient((_) async {
      requests++;
      return http.Response('{}', 200);
    });

    final result = await uploader(client: client).uploadPending();

    expect(requests, 3);
    expect((result as UploadSuccess).uploaded, uploadBatchSize * 2 + 7);
    expect(await db.countUnsynced(), 0);
  });

  test('a failure partway through reports what did land', () async {
    await seed(uploadBatchSize + 10);
    var requests = 0;
    final client = MockClient((_) async {
      requests++;
      return http.Response('{}', requests == 1 ? 200 : 503);
    });

    final result = await uploader(client: client).uploadPending();

    expect(result, isA<UploadPartial>());
    expect((result as UploadPartial).uploaded, uploadBatchSize);
    expect(await db.countUnsynced(), 10,
        reason: 'the first batch landed; the rest must survive for retry');
  });
}