import 'dart:convert';

import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'package:miler/data/accepted_store.dart';
import 'package:miler/data/service_profile.dart';
import 'package:miler/data/work_scope.dart';

/// ─────────────────────────────────────────────────────────────────────────
/// ONE RIDER, ONE DRAWER
///
/// Miler runs a milk-man round and a logistics day off one app and one login,
/// and it kept finished work under *global* SharedPreferences keys —
/// `completed_bookings` and friends. One phone, one drawer, whoever wrote
/// last: log out and back in as another rider, or move tenant, and the
/// previous scope's history was sitting in the new session's Activity.
///
/// These pin the ownership rule at the data boundary. Nothing here filters on
/// a display string — no kitchen names, no "Milk", no screen titles — only on
/// identity the session can prove: rider and tenant.
///
/// ── The line came OUT of the key, deliberately ──
///
/// It used to be a third part: `completed_bookings::u38.t13.milkMan`. That was
/// right while a rider was one kind of rider for the life of his account. He is
/// not. One Miler carries meal parcels, logistics collections and customer
/// pickups in the same shift, and keying his records by line split one day
/// across two drawers — so work he finished an hour ago vanished when the app
/// resolved him differently. Two tests below used to assert that split and now
/// assert the opposite; they are the record of the rule changing.
/// ─────────────────────────────────────────────────────────────────────────
void main() {
  const riderA = WorkScope(userId: 38, tenantId: 13);
  const riderB = WorkScope(userId: 99, tenantId: 13);
  const otherTenant = WorkScope(userId: 38, tenantId: 77);

  group('the key', () {
    test('rider and tenant each change the drawer', () {
      final keys = {
        riderA.scoped('completed_bookings'),
        riderB.scoped('completed_bookings'),
        otherTenant.scoped('completed_bookings'),
      };
      expect(
        keys.length,
        3,
        reason:
            'both identity parts must be in the key — two scopes sharing a '
            'key is the leak itself',
      );
      expect(
        riderA.scoped('completed_bookings'),
        contains('completed_bookings'),
      );
    });

    test('the line is no longer part of the drawer', () {
      expect(
        riderA.key,
        isNot(contains('milkMan')),
        reason: 'one rider, one day, one drawer — whatever he is carrying',
      );
      for (final legacy in riderA.legacyScopedKeys('completed_bookings')) {
        expect(legacy, isNot(riderA.scoped('completed_bookings')));
        expect(legacy, startsWith('completed_bookings::u38.t13.'));
      }
    });

    test('the same session resolves to the same drawer', () {
      expect(
        riderA.scoped('skipped_bookings'),
        const WorkScope(userId: 38, tenantId: 13).scoped('skipped_bookings'),
      );
    });
  });

  group('ownership', () {
    test('one rider owns his record whatever he was carrying', () {
      // This asserted the opposite once: same rider, same tenant, other line
      // "must not cross". Under one-Miler that rule loses him his own work —
      // a meal drop and a parcel collection in the same shift are both his.
      final row = riderA.stamp({'orderid': 'A1'});
      expect(riderA.owns(row), isTrue);
      expect(riderA.excludes(row), isFalse);
    });

    test('another rider cannot claim it', () {
      final row = riderA.stamp({'orderid': 'A1'});
      expect(riderB.owns(row), isFalse);
      expect(riderB.excludes(row), isTrue);
    });

    test('another tenant cannot claim it', () {
      final row = riderA.stamp({'orderid': 'A1'});
      expect(otherTenant.owns(row), isFalse);
      expect(otherTenant.excludes(row), isTrue);
    });

    test('the API stamps its own identity and it is honoured', () {
      // Rows straight off `/miler/assignments` carry the rider; no scope stamp
      // is involved and it must still be respected.
      expect(riderA.excludes({'orderid': 'A1', 'mileruserid': 99}), isTrue);
      expect(riderA.excludes({'orderid': 'A1', 'mileruserid': 38}), isFalse);
    });

    test('silence is read differently by the two questions', () {
      // A row with no identity: `owns` refuses to adopt it (used on legacy
      // rows, where inventing ownership IS the leak), `excludes` keeps it
      // (used on rows the API just returned for this session).
      final bare = {'orderid': 'A1'};
      expect(riderA.owns(bare), isFalse);
      expect(riderA.excludes(bare), isFalse);
    });
  });

  group('the store, scoped', () {
    setUp(() => ServiceProfile.setActive(ServiceProfile.milkMan));
    tearDown(() => ServiceProfile.setActive(ServiceProfile.parcel));

    String today() {
      final n = DateTime.now();
      return '${n.year}-${n.month.toString().padLeft(2, '0')}-'
          '${n.day.toString().padLeft(2, '0')}';
    }

    test(
      'completed work written as one rider is invisible to the next',
      () async {
        // Rider 38 finishes a stop.
        SharedPreferences.setMockInitialValues({'userid': 38});
        await addCompletedBookings([
          {'orderid': 'MILK-1', 'pickupcustomer': 'Joe'},
        ], terminalStatus: 'delivered');
        final mine = await getCompletedBookings();
        expect(mine.map((r) => r['orderid']), contains('MILK-1'));

        // Rider 99 signs in on the same handset. Same day, same store, same
        // process — a different drawer.
        SharedPreferences.setMockInitialValues({'userid': 99});
        final theirs = await getCompletedBookings();
        expect(
          theirs.where((r) => r['orderid'] == 'MILK-1'),
          isEmpty,
          reason: "logging in must never expose the previous rider's history",
        );
      },
    );

    test('a mixed shift is one history, not two', () async {
      // The inverse of what this asserted before. One Miler collects meals and
      // parcels in the same shift; his Activity is his day, and a label the app
      // resolved him with must not hide half of it.
      SharedPreferences.setMockInitialValues({'userid': 38});
      ServiceProfile.setActive(ServiceProfile.milkMan);
      await addCompletedBookings([
        {'orderid': 'ROUND-1'},
      ], terminalStatus: 'delivered');

      ServiceProfile.setActive(ServiceProfile.parcel);
      await addCompletedBookings([
        {'orderid': 'PARCEL-1'},
      ], terminalStatus: 'picked');

      final ids = (await getCompletedBookings())
          .map((r) => r['orderid'])
          .toList();
      expect(
        ids,
        containsAll(<String>['ROUND-1', 'PARCEL-1']),
        reason: 'both were finished by rider 38 on tenant 13, in one shift',
      );

      // And it still holds from the other side.
      ServiceProfile.setActive(ServiceProfile.milkMan);
      expect(
        (await getCompletedBookings()).map((r) => r['orderid']),
        containsAll(<String>['ROUND-1', 'PARCEL-1']),
      );
    });

    test('a stored record carries the identity that produced it', () async {
      SharedPreferences.setMockInitialValues({'userid': 38});
      await addCompletedBookings([
        {'orderid': 'STAMP-1'},
      ], terminalStatus: 'delivered');
      final row = (await getCompletedBookings()).single;
      expect(row['scopeuserid'], 38);
      expect(
        row.containsKey('scopeline'),
        isFalse,
        reason: 'the line is not part of ownership any more',
      );
    });

    test('logout empties this scope', () async {
      SharedPreferences.setMockInitialValues({'userid': 38});
      await addCompletedBookings([
        {'orderid': 'BYE-1'},
      ], terminalStatus: 'delivered');
      expect(await getCompletedBookings(), isNotEmpty);

      await clearScopedStores();
      expect(
        await getCompletedBookings(),
        isEmpty,
        reason: 'signing out must not leave records for the next rider',
      );
    });

    test('work stored under the old line-suffixed key is not lost', () async {
      // The upgrade a real rider takes mid-shift. His finished stops were
      // written to `completed_bookings::u38.t13.milkMan`; the key no longer has
      // that suffix. Dropping them would lose work he actually did, and unlike
      // a global key these rows are NOT anonymous — the key itself names him.
      final today = DateTime.now();
      final stamp =
          '${today.year}-${today.month.toString().padLeft(2, '0')}-'
          '${today.day.toString().padLeft(2, '0')}';

      SharedPreferences.setMockInitialValues({
        'userid': 38,
        'completed_bookings::u38.t0.milkMan': jsonEncode([
          {'orderid': 'OLD-MILK', 'completedday': stamp},
        ]),
        'completed_bookings::u38.t0.parcel': jsonEncode([
          {'orderid': 'OLD-PARCEL', 'completedday': stamp},
        ]),
      });

      // The migration has to be *run*. It is not lazy — `getCompletedBookings`
      // reads the scoped key and nothing else — and this test called the reader
      // without the migrator, so it was asserting against a drawer nobody had
      // filled yet. `main()` awaits this on startup, before the first frame.
      await migrateLegacyStores();

      final rows = await getCompletedBookings();
      expect(
        rows.map((r) => r['orderid']),
        containsAll(<String>['OLD-MILK', 'OLD-PARCEL']),
        reason: 'both old drawers belong to rider 38 — merge, never drop',
      );

      // And the old keys are gone, so a second run cannot duplicate them.
      final prefs = await SharedPreferences.getInstance();
      expect(prefs.containsKey('completed_bookings::u38.t0.milkMan'), isFalse);
      expect(prefs.containsKey('completed_bookings::u38.t0.parcel'), isFalse);
      expect(
        (await getCompletedBookings())
            .where((r) => r['orderid'] == 'OLD-MILK')
            .length,
        1,
        reason: 'the merge must be idempotent',
      );
    });

    test('unattributable legacy rows are dropped, not adopted', () async {
      // The pre-scoping global key, holding somebody's rows. Nothing on them
      // says whose, so adopting them would be inventing ownership.
      SharedPreferences.setMockInitialValues({
        'userid': 38,
        'completed_bookings': jsonEncode([
          {'orderid': 'LEGACY-1', 'completedday': today()},
        ]),
      });

      await migrateLegacyStores();

      expect(
        (await getCompletedBookings()).where((r) => r['orderid'] == 'LEGACY-1'),
        isEmpty,
        reason: 'a row that cannot prove ownership must not be adopted',
      );
      final prefs = await SharedPreferences.getInstance();
      expect(
        prefs.containsKey('completed_bookings'),
        isFalse,
        reason: 'the global key is drained so it can never be read again',
      );
    });

    test('a legacy row that proves ownership is carried across', () async {
      SharedPreferences.setMockInitialValues({
        'userid': 38,
        'completed_bookings': jsonEncode([
          {
            'orderid': 'LEGACY-MINE',
            'completedday': today(),
            'mileruserid': 38,
            'scopeline': 'milkMan',
          },
        ]),
      });

      await migrateLegacyStores();

      expect(
        (await getCompletedBookings()).map((r) => r['orderid']),
        contains('LEGACY-MINE'),
      );
    });
  });
}