import 'dart:convert';

import 'package:flutter_test/flutter_test.dart';
import 'package:http/http.dart' as http;
import 'package:http/testing.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'package:miler/data/miler_api.dart';
import 'package:miler/providers/pickuplog/pickuplog_provider.dart';

/// ─────────────────────────────────────────────────────────────────────────
/// THE DOOR PHOTOGRAPH REACHES THE HUB
///
/// `POST /miler/bookings/:id/parcel` has accepted `photos` for as long as the
/// route has existed. The server's own note says why it is there: *"Weight
/// without a photograph is a number the customer has no way to check, and this
/// is the only point in the flow where anyone is standing next to the parcel."*
///
/// The app never sent it — and not by oversight in one place, but through three
/// separate defects that each had to be fixed:
///
///  1. `ParcelEntry.toJson()` had no `photos` key at all.
///  2. `uploadProof` kept the public **URL** from the sign response and threw
///     away the **key**, which is what `photos` is specified in.
///  3. The pickup upload passed a **booking** id in the `consignmentid` slot,
///     so every pickup proof this app ever uploaded was filed under a
///     consignment number that did not exist.
///
/// Meanwhile `StopVerificationPage` *compels* the photograph — the rider cannot
/// confirm the stop without one. So the app demanded the single piece of
/// evidence that settles a dispute, uploaded it, and dropped the reference.
/// ─────────────────────────────────────────────────────────────────────────
void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  group('ParcelEntry serialisation', () {
    test('photos are sent when there are any', () {
      final json = const ParcelEntry(
        weight: 2.5,
        photos: ['pickup_proof/pickup_proof-4821-20260916-101402-a1b2.jpg'],
      ).toJson();

      expect(json['photos'], isA<List>());
      expect(
        json['photos'],
        ['pickup_proof/pickup_proof-4821-20260916-101402-a1b2.jpg'],
      );
      expect(json['weight'], 2.5);
    });

    test('the key is a storage key, never a URL', () {
      // The customer is served a short-lived signed link *derived from* the
      // key. A URL stored here either expires or, worse, never does.
      final json = const ParcelEntry(
        weight: 1,
        photos: ['pickup_proof/pickup_proof-4821-20260916-101402-a1b2.jpg'],
      ).toJson();
      final photo = (json['photos'] as List).single.toString();

      expect(photo, isNot(startsWith('http')));
      expect(photo, isNot(contains('://')));
      expect(photo, contains('/'), reason: 'a key is {folder}/{file}');
    });

    test('no photo means the field is OMITTED, not sent empty', () {
      // An empty array is a claim that no photograph was taken. A failed
      // upload is not that claim, and the difference matters to whoever reads
      // the record afterwards.
      final json = const ParcelEntry(weight: 1).toJson();
      expect(json.containsKey('photos'), isFalse);
    });

    test('a local filesystem path is never what gets sent', () {
      // The shape the bug produced: `parcelImage` held `/data/user/0/…/x.jpg`
      // and nothing ever turned it into a reference the server could resolve.
      final json = const ParcelEntry(weight: 1).toJson();
      expect(json.toString(), isNot(contains('/data/user/')));
      expect(json.toString(), isNot(contains('.jpg')));
    });
  });

  group('the parcel request that actually leaves the phone', () {
    late List<http.Request> sent;

    setUp(() {
      SharedPreferences.setMockInitialValues({'userid': 38, 'authtoken': 't'});
      sent = <http.Request>[];
      MilerApi.client = MockClient((req) async {
        sent.add(req);
        return http.Response('{"success":true,"data":{}}', 200);
      });
    });

    tearDown(() => MilerApi.client = http.Client());

    Map<String, dynamic> bodyOf(http.Request r) =>
        jsonDecode(r.body) as Map<String, dynamic>;

    test('photos ride on the wire to /parcel', () async {
      await MilerApi.submitParcels(4821, const [
        ParcelEntry(weight: 2, photos: ['pickup_proof/p-4821-x.jpg']),
        ParcelEntry(weight: 2),
      ]);

      expect(sent, hasLength(1));
      expect(sent.single.url.path, endsWith('/miler/bookings/4821/parcel'));

      final parcels = bodyOf(sent.single)['parcels'] as List;
      expect(parcels, hasLength(2));
      expect((parcels[0] as Map)['photos'], ['pickup_proof/p-4821-x.jpg']);
      expect(
        (parcels[1] as Map).containsKey('photos'),
        isFalse,
        reason: 'one photograph of the load, not one claimed per box',
      );
    });

    test('the sign call keys a PRE-pickup proof on the BOOKING', () async {
      // There is no consignment yet — `pickup-complete` has not run. The server
      // builds the storage key from consignmentid, then bookingid, then the
      // rider; passing a booking id in the consignment slot filed the proof
      // under a consignment number that did not exist.
      await MilerApi.signUpload(
        purpose: MilerApi.proofPickup,
        bookingId: 4821,
      );

      final body = bodyOf(sent.single);
      expect(body['bookingid'], 4821);
      expect(
        body.containsKey('consignmentid'),
        isFalse,
        reason: 'a booking id must never be sent as a consignment id',
      );
      expect(body['purpose'], 'pickup_proof');
    });

    test('a delivery proof still keys on the consignment', () async {
      // The other half of the contract, unchanged — `deliver` takes a URL and
      // its proof belongs to a consignment that exists by then.
      await MilerApi.signUpload(
        purpose: MilerApi.proofDelivery,
        consignmentId: 77,
      );

      final body = bodyOf(sent.single);
      expect(body['consignmentid'], 77);
      expect(body.containsKey('bookingid'), isFalse);
    });
  });

  group('the provider turns a verification map into parcels', () {
    late List<http.Request> sent;

    setUp(() {
      SharedPreferences.setMockInitialValues({'userid': 38, 'authtoken': 't'});
      sent = <http.Request>[];
      MilerApi.client = MockClient((req) async {
        sent.add(req);
        return http.Response('{"success":true,"data":{}}', 200);
      });
    });

    tearDown(() => MilerApi.client = http.Client());

    test('a key on the verification map reaches the first parcel', () async {
      await UpdatePickupProvider().submitParcels(4821, const {
        'pickup': {
          'collected': 3,
          'weight': '6',
          'photos': ['pickup_proof/p-4821-x.jpg'],
        },
      });

      final parcels =
          (jsonDecode(sent.single.body) as Map)['parcels'] as List;
      expect(parcels, hasLength(3), reason: 'three boxes were collected');
      expect((parcels[0] as Map)['photos'], ['pickup_proof/p-4821-x.jpg']);
      expect((parcels[1] as Map).containsKey('photos'), isFalse);
      expect((parcels[2] as Map).containsKey('photos'), isFalse);

      // The weight is still split evenly across the three — unchanged.
      expect((parcels[0] as Map)['weight'], 2.0);
    });

    test('a failed upload still records the parcels', () async {
      // A dead object store must not strand a rider at a door holding parcels
      // he cannot record. The pickup goes through; the gap is logged.
      await UpdatePickupProvider().submitParcels(4821, const {
        'pickup': {'collected': 1, 'weight': '2'},
      });

      expect(sent, hasLength(1), reason: 'the parcels were still submitted');
      final parcels =
          (jsonDecode(sent.single.body) as Map)['parcels'] as List;
      expect((parcels[0] as Map).containsKey('photos'), isFalse);
    });

    test('a blank key is dropped rather than sent', () async {
      await UpdatePickupProvider().submitParcels(4821, const {
        'pickup': {
          'collected': 1,
          'weight': '2',
          'photos': ['', '   '],
        },
      });

      final parcels =
          (jsonDecode(sent.single.body) as Map)['parcels'] as List;
      expect((parcels[0] as Map).containsKey('photos'), isFalse);
    });
  });
}