import 'dart:convert';
import 'dart:typed_data';

import 'package:clock/clock.dart';
import 'package:halkyon_base_server/base.dart';
import 'package:serverpod/protocol.dart' show CloudStorageEntry;
import 'package:serverpod/serverpod.dart';
import 'package:serverpod_auth_idp_server/core.dart';
import 'package:test/test.dart';

import '../support/fixtures.dart';
import '../test_tools/serverpod_test_tools.dart';

void main() {
  withServerpod(
    'Public profiles',
    rollbackDatabase: RollbackDatabase.disabled,
    (sessionBuilder, endpoints) {
      late Session session;

      setUp(() {
        useBase(sessionBuilder);
        session = sessionBuilder.build();
      });
      tearDown(() async {
        await PublicProfile.db.deleteWhere(session, where: (t) => t.id > 0);
        await RateLimitedRequestAttempt.db.deleteWhere(
          session,
          where: (t) => t.id.notEquals(null),
        );
      });

      /// A person with an identity, signed in.
      TestSessionBuilder identifiedPerson() => sessionBuilder.copyWith(
        authentication: AuthenticationOverride.authenticationInfo(
          const Uuid().v7(),
          {identified},
        ),
      );

      final alice = identifiedPerson();
      final bob = identifiedPerson();

      Future<Profile> save(
        TestSessionBuilder person,
        String handle, {
        String displayName = '',
        String bio = '',
        List<String> links = const [],
      }) => endpoints.profile.save(person, handle, displayName, bio, links);

      Matcher refused(ProfileRefusal reason) => throwsA(
        isA<ProfileRefusedException>().having(
          (error) => error.reason,
          'reason',
          reason,
        ),
      );

      test('a person with an identity makes a profile, found by its handle '
          'whatever its case, at the account domain', () async {
        final saved = await save(
          alice,
          'Raisondetredev',
          displayName: ' Tizian ',
          bio: 'Learning Japanese.',
          links: [' https://halkyon.app ', ''],
        );

        expect(saved.handle, 'Raisondetredev');
        expect(saved.address, startsWith('Raisondetredev@'));
        expect(saved.displayName, 'Tizian');
        expect(saved.links, ['https://halkyon.app']);
        expect(saved.handleFixed, isFalse);
        // Generated classes compare by identity: their JSON by value.
        expect((await endpoints.profile.mine(alice))!.toJson(), saved.toJson());
        expect(
          (await endpoints.profiles.byHandle(bob, 'raisondetredev')).toJson(),
          saved.toJson(),
        );
      });

      test('an anonymous person has no profile to make or read', () async {
        final anonymous = sessionBuilder.copyWith(
          authentication: AuthenticationOverride.authenticationInfo(
            const Uuid().v7(),
            {},
          ),
        );

        await expectLater(
          save(anonymous, 'nobody'),
          throwsA(isA<ServerpodInsufficientAccessException>()),
        );
        await expectLater(
          endpoints.profile.mine(anonymous),
          throwsA(isA<ServerpodInsufficientAccessException>()),
        );
        await expectLater(
          endpoints.profile.checkHandle(anonymous, 'nobody'),
          throwsA(isA<ServerpodInsufficientAccessException>()),
        );
        expect(await PublicProfile.db.count(session), 0);
      });

      test('a handle is checked as saving would check it: free, or your '
          'own, whatever its case; else why not', () async {
        await save(alice, 'alice');

        Future<ProfileRefusal?> check(String handle) =>
            endpoints.profile.checkHandle(bob, handle);
        expect(await check('bob'), isNull);
        expect(await check('ALICE'), ProfileRefusal.handleTaken);
        expect(await check('a-b'), ProfileRefusal.handleInvalid);
        expect(await check('Admin'), ProfileRefusal.handleReserved);
        expect(
          await endpoints.profile.checkHandle(alice, 'Alice'),
          isNull,
        );
        // Checking makes nothing.
        expect(await endpoints.profile.mine(bob), isNull);
      });

      test('nobody signed in reads profiles', () async {
        await save(alice, 'alice');

        await expectLater(
          endpoints.profiles.byHandle(sessionBuilder, 'alice'),
          throwsA(isA<ServerpodUnauthenticatedException>()),
        );
      });

      test('a handle someone else has is refused, whatever its case; their '
          'profile stays theirs', () async {
        await save(alice, 'alice', displayName: 'Alice');

        await expectLater(
          save(bob, 'ALICE'),
          refused(ProfileRefusal.handleTaken),
        );
        expect((await endpoints.profile.mine(alice))!.displayName, 'Alice');
        expect(await endpoints.profile.mine(bob), isNull);
      });

      test('handles are 1 to 30 letters, digits or underscores, not one '
          'kept for the instance', () async {
        for (final handle in ['', 'with space', 'é', 'a-b', 'a' * 31]) {
          await expectLater(
            save(alice, handle),
            refused(ProfileRefusal.handleInvalid),
            reason: handle,
          );
        }
        await expectLater(
          save(alice, 'Admin'),
          refused(ProfileRefusal.handleReserved),
        );
        expect((await save(alice, 'a_1' * 10)).handle, 'a_1' * 10);
      });

      test('the name, bio and links stay within their bounds', () async {
        await expectLater(
          save(alice, 'alice', displayName: 'x' * 31),
          refused(ProfileRefusal.displayNameTooLong),
        );
        await expectLater(
          save(alice, 'alice', bio: 'x' * 501),
          refused(ProfileRefusal.bioTooLong),
        );
        await expectLater(
          save(alice, 'alice', links: List.filled(5, 'https://a.example')),
          refused(ProfileRefusal.tooManyLinks),
        );
        for (final link in ['halkyon.app', 'ftp://a.example', 'https://']) {
          await expectLater(
            save(alice, 'alice', links: [link]),
            refused(ProfileRefusal.linkInvalid),
            reason: link,
          );
        }
      });

      test('the handle changes until the first publish; then it is fixed, '
          'and the profile stays, though the rest still changes', () async {
        await save(alice, 'alice');
        expect((await save(alice, 'alice_jp')).handle, 'alice_jp');

        final row = (await PublicProfile.db.findFirstRow(
          session,
          where: (t) => t.handleKey.equals('alice_jp'),
        ))!;
        await PublicProfile.db.updateRow(
          session,
          row.copyWith(firstPublishedAt: clock.now().toUtc()),
        );

        await expectLater(
          save(alice, 'alice'),
          refused(ProfileRefusal.published),
        );
        expect(
          await endpoints.profile.checkHandle(alice, 'alice'),
          ProfileRefusal.published,
        );
        expect(
          await endpoints.profile.checkHandle(alice, 'ALICE_jp'),
          isNull,
        );
        await expectLater(
          endpoints.profile.remove(alice),
          refused(ProfileRefusal.published),
        );
        final renamed = await save(alice, 'Alice_JP', displayName: 'Alice');
        expect((renamed.handle, renamed.handleFixed), ('Alice_JP', true));
      });

      test('removing a profile makes it private: its handle stays its '
          "person's, what was filled in goes, and others find it as a handle "
          'nobody has (ADR 0020, D27)', () async {
        await save(
          alice,
          'Alice',
          displayName: 'Alice',
          bio: 'Learning Japanese.',
          links: ['https://halkyon.app'],
        );
        expect(
          (await endpoints.profiles.byHandle(bob, 'alice')).handle,
          'Alice',
        );

        final removed = (await endpoints.profile.remove(alice))!;

        expect(
          (
            removed.handle,
            removed.displayName,
            removed.bio,
            removed.avatarUrl,
            removed.handleFixed,
          ),
          ('Alice', '', '', null, false),
        );
        expect(removed.links, isEmpty);
        expect(removed.verifiedLinks ?? const <String>[], isEmpty);
        expect(
          (await endpoints.profile.mine(alice))!.toJson(),
          removed.toJson(),
        );
        await expectLater(
          endpoints.profiles.byHandle(bob, 'alice'),
          throwsA(isA<ProfileNotFoundException>()),
        );
        await expectLater(
          save(bob, 'alice'),
          refused(ProfileRefusal.handleTaken),
        );
        // Filled in again, it is public again.
        await save(alice, 'Alice', displayName: 'Alice');
        expect(
          (await endpoints.profiles.byHandle(bob, 'alice')).displayName,
          'Alice',
        );
      });

      test('removing nothing gives nothing: without a profile', () async {
        expect(await endpoints.profile.remove(bob), isNull);
        expect(await endpoints.profile.mine(bob), isNull);
      });

      test('a profile is found by its handle only once its person goes '
          'public: with something published, or the profile filled in; '
          'their own they see all along (D5)', () async {
        Future<String?> found() async {
          try {
            return (await endpoints.profiles.byHandle(bob, 'alice')).handle;
          } on ProfileNotFoundException {
            return null;
          }
        }

        await save(alice, 'Alice');
        expect(await found(), isNull);
        expect((await endpoints.profile.mine(alice))!.handle, 'Alice');

        for (final (displayName, bio, links) in [
          ('Alice', '', const <String>[]),
          ('', 'Learning Japanese.', const <String>[]),
          ('', '', ['https://halkyon.app']),
        ]) {
          await save(
            alice,
            'Alice',
            displayName: displayName,
            bio: bio,
            links: links,
          );
          expect(await found(), 'Alice', reason: '$displayName$bio$links');
        }
        await save(alice, 'Alice');
        expect(await found(), isNull);

        final row = (await PublicProfile.db.findFirstRow(
          session,
          where: (t) => t.handleKey.equals('alice'),
        ))!;
        await PublicProfile.db.updateRow(
          session,
          row.copyWith(firstPublishedAt: clock.now().toUtc()),
        );
        expect(await found(), 'Alice');
      });

      group('Answers about handles', () {
        Future<ProfileRefusal?> check(
          TestSessionBuilder person,
          String handle,
        ) => endpoints.profile.checkHandle(person, handle);

        test('are at most 30 an hour for a person: checking a handle and '
            'saving a new one count, a refused one neither', () async {
          await save(alice, 'alice');
          for (var i = 0; i < 29; i++) {
            await check(bob, 'bob$i');
          }
          await save(bob, 'bob');

          await expectLater(
            check(bob, 'alice'),
            refused(ProfileRefusal.tooManyHandleChecks),
          );
          await expectLater(
            save(bob, 'alice'),
            refused(ProfileRefusal.tooManyHandleChecks),
          );
          expect((await endpoints.profile.mine(bob))!.handle, 'bob');
          // Saving their own handle again, whatever its case, answers nothing
          // new, nor does checking it, or a handle that is none.
          expect(
            (await save(bob, 'Bob', displayName: 'Bob')).displayName,
            'Bob',
          );
          expect(await check(bob, 'BOB'), isNull);
          expect(await check(bob, 'a-b'), ProfileRefusal.handleInvalid);
          expect(await check(bob, 'admin'), ProfileRefusal.handleReserved);
          // Others ask on.
          expect(await check(alice, 'carla'), isNull);
        });

        test('are at most 60 an hour from one network, whoever asks', () async {
          for (var i = 0; i < 30; i++) {
            await check(alice, 'carla$i');
          }
          for (var i = 0; i < 30; i++) {
            await check(bob, 'dora$i');
          }

          await expectLater(
            check(identifiedPerson(), 'emil'),
            refused(ProfileRefusal.tooManyHandleChecks),
          );
        });
      });

      test("a handle nobody has isn't found", () async {
        await expectLater(
          endpoints.profiles.byHandle(alice, 'nobody'),
          throwsA(isA<ProfileNotFoundException>()),
        );
      });

      test('deleting a person deletes their profile', () async {
        useBase(sessionBuilder);
        final carol = (await AuthServices.instance.authUsers.create(session))
            .id;
        await endpoints.profile.save(
          sessionBuilder.copyWith(
            authentication: AuthenticationOverride.authenticationInfo(
              carol.uuid,
              {identified},
            ),
          ),
          'carol',
          '',
          '',
          [],
        );

        await deletePerson(session, carol);

        expect(await PublicProfile.db.count(session), 0);
      });

      group('An avatar', () {
        /// A PNG of one pixel, [shade] of grey.
        ByteData png(int shade) {
          final bytes = base64Decode(
            'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==',
          );
          // A byte past the signature, so each shade is another file.
          bytes[bytes.length - 1] = shade;
          return ByteData.sublistView(bytes);
        }

        Future<int> stored() => CloudStorageEntry.db.count(
          session,
          where: (t) => t.storageId.equals('public'),
        );

        tearDown(
          () => CloudStorageEntry.db.deleteWhere(
            session,
            where: (t) => t.storageId.equals('public'),
          ),
        );

        test('is shown from a public URL that names the picture, not the '
            'person', () async {
          await save(alice, 'alice');

          final profile = await endpoints.profile.setAvatar(alice, png(1));

          final url = profile.avatarUrl!;
          expect(url, contains('avatars'));
          final row = (await PublicProfile.db.findFirstRow(
            session,
            where: (t) => t.handleKey.equals('alice'),
          ))!;
          expect(url, isNot(contains(row.authUserId.toString())));
          expect(await stored(), 1);
        });

        test('is a PNG of at most 1 MB, nothing else', () async {
          await save(alice, 'alice');

          await expectLater(
            endpoints.profile.setAvatar(
              alice,
              ByteData.sublistView(Uint8List.fromList(utf8.encode('GIF89a…'))),
            ),
            refused(ProfileRefusal.avatarInvalid),
          );
          final huge = Uint8List(1024 * 1024 + 1)
            ..setRange(0, 8, png(1).buffer.asUint8List(0, 8));
          await expectLater(
            endpoints.profile.setAvatar(alice, ByteData.sublistView(huge)),
            refused(ProfileRefusal.avatarInvalid),
          );
          expect(await stored(), 0);
        });

        test('makes a profile public by itself (D5)', () async {
          await save(alice, 'alice');

          await endpoints.profile.setAvatar(alice, png(1));
          expect(
            (await endpoints.profiles.byHandle(bob, 'alice')).handle,
            'alice',
          );

          await endpoints.profile.removeAvatar(alice);
          await expectLater(
            endpoints.profiles.byHandle(bob, 'alice'),
            throwsA(isA<ProfileNotFoundException>()),
          );
        });

        test('needs a profile to show on', () async {
          await expectLater(
            endpoints.profile.setAvatar(alice, png(1)),
            throwsA(isA<ProfileNotFoundException>()),
          );
        });

        test('a new one replaces the old, whose file goes; one another '
            'profile shows stays', () async {
          await save(alice, 'alice');
          await save(bob, 'bob');
          await endpoints.profile.setAvatar(alice, png(1));
          await endpoints.profile.setAvatar(bob, png(1));

          await endpoints.profile.setAvatar(alice, png(2));
          expect(await stored(), 2);
          await endpoints.profile.setAvatar(bob, png(3));
          expect(await stored(), 2);

          final removed = await endpoints.profile.removeAvatar(alice);
          expect(removed.avatarUrl, isNull);
          expect(await stored(), 1);
        });

        test('goes with its person, and with the profile', () async {
          useBase(sessionBuilder);
          final carol = (await AuthServices.instance.authUsers.create(
            session,
          )).id;
          final asCarol = sessionBuilder.copyWith(
            authentication: AuthenticationOverride.authenticationInfo(
              carol.uuid,
              {identified},
            ),
          );
          await save(asCarol, 'carol');
          await endpoints.profile.setAvatar(asCarol, png(4));
          await save(alice, 'alice');
          await endpoints.profile.setAvatar(alice, png(5));

          await deletePerson(session, carol);
          expect(await stored(), 1);
          await endpoints.profile.remove(alice);
          expect(await stored(), 0);
        });
      });
    },
  );
}