import { Injectable } from '@nestjs/common';
import { Test, TestingModule } from '@nestjs/testing';
import { PrismaService } from '../../src/adapters/secondaries/prisma-service';
import { PrismaRepository } from '../../src/adapters/secondaries/prisma-repository.abstract';
import { DatabaseException } from '../../src/exceptions/database.exception';
import { Prisma } from '@prisma/client';

class FakeEntity {
  uuid?: string;
  name: string;
}

let entityId = 2;
const entityUuid = 'uuid-';
const entityName = 'name-';

const createRandomEntity = (): FakeEntity => {
  const entity: FakeEntity = {
    uuid: `${entityUuid}${entityId}`,
    name: `${entityName}${entityId}`,
  };

  entityId++;

  return entity;
};

const fakeEntityToCreate: FakeEntity = {
  name: 'test',
};

const fakeEntityCreated: FakeEntity = {
  ...fakeEntityToCreate,
  uuid: 'some-uuid',
};

const fakeEntities: FakeEntity[] = [];
Array.from({ length: 10 }).forEach(() => {
  fakeEntities.push(createRandomEntity());
});

@Injectable()
class FakePrismaRepository extends PrismaRepository<FakeEntity> {
  protected _model = 'fake';
}

class FakePrismaService extends PrismaService {
  fake: any;
}

const mockPrismaService = {
  $transaction: jest.fn().mockImplementation(async (data: any) => {
    const entities = await data[0];
    if (entities.length == 1) {
      return Promise.resolve([[fakeEntityCreated], 1]);
    }

    return Promise.resolve([fakeEntities, fakeEntities.length]);
  }),
  // eslint-disable-next-line @typescript-eslint/no-unused-vars
  $queryRawUnsafe: jest.fn().mockImplementation((query?: string) => {
    return Promise.resolve(fakeEntities);
  }),
  $executeRawUnsafe: jest
    .fn()
    .mockResolvedValueOnce(fakeEntityCreated)
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    .mockImplementationOnce((fields: object) => {
      throw new Prisma.PrismaClientKnownRequestError('unknown request', {
        code: 'code',
        clientVersion: 'version',
      });
    })
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    .mockImplementationOnce((fields: object) => {
      throw new Error('an unknown error');
    })
    .mockResolvedValueOnce(fakeEntityCreated)
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    .mockImplementationOnce((fields: object) => {
      throw new Prisma.PrismaClientKnownRequestError('unknown request', {
        code: 'code',
        clientVersion: 'version',
      });
    })
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    .mockImplementationOnce((fields: object) => {
      throw new Error('an unknown error');
    }),
  $queryRaw: jest
    .fn()
    .mockImplementationOnce(() => {
      throw new Prisma.PrismaClientKnownRequestError('unknown request', {
        code: 'code',
        clientVersion: 'version',
      });
    })
    .mockImplementationOnce(() => {
      return true;
    })
    .mockImplementation(() => {
      throw new Prisma.PrismaClientKnownRequestError('Database unavailable', {
        code: 'code',
        clientVersion: 'version',
      });
    }),
  fake: {
    create: jest
      .fn()
      .mockResolvedValueOnce(fakeEntityCreated)
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      .mockImplementationOnce((params?: any) => {
        throw new Prisma.PrismaClientKnownRequestError('unknown request', {
          code: 'code',
          clientVersion: 'version',
        });
      })
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      .mockImplementationOnce((params?: any) => {
        throw new Error('an unknown error');
      }),

    findMany: jest.fn().mockImplementation((params?: any) => {
      if (params?.where?.limit == 1) {
        return Promise.resolve([fakeEntityCreated]);
      }

      return Promise.resolve(fakeEntities);
    }),
    count: jest.fn().mockResolvedValue(fakeEntities.length),

    findUnique: jest.fn().mockImplementation(async (params?: any) => {
      let entity;

      if (params?.where?.uuid) {
        entity = fakeEntities.find(
          (entity) => entity.uuid === params?.where?.uuid,
        );
      }

      if (!entity && params?.where?.uuid == 'unknown') {
        throw new Prisma.PrismaClientKnownRequestError('unknown request', {
          code: 'code',
          clientVersion: 'version',
        });
      } else if (!entity) {
        throw new Error('no entity');
      }

      return entity;
    }),

    findFirst: jest
      .fn()
      .mockImplementationOnce((params?: any) => {
        if (params?.where?.name) {
          return Promise.resolve(
            fakeEntities.find((entity) => entity.name === params?.where?.name),
          );
        }
      })
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      .mockImplementationOnce((params?: any) => {
        throw new Prisma.PrismaClientKnownRequestError('unknown request', {
          code: 'code',
          clientVersion: 'version',
        });
      })
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      .mockImplementationOnce((params?: any) => {
        throw new Error('an unknown error');
      }),

    update: jest
      .fn()
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      .mockImplementationOnce((params?: any) => {
        throw new Prisma.PrismaClientKnownRequestError('unknown request', {
          code: 'code',
          clientVersion: 'version',
        });
      })
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      .mockImplementationOnce((params?: any) => {
        throw new Prisma.PrismaClientKnownRequestError('unknown request', {
          code: 'code',
          clientVersion: 'version',
        });
      })
      .mockImplementationOnce((params: any) => {
        const entity = fakeEntities.find(
          (entity) => entity.name === params.where.name,
        );
        Object.entries(params.data).map(([key, value]) => {
          entity[key] = value;
        });

        return Promise.resolve(entity);
      })
      .mockImplementation((params: any) => {
        const entity = fakeEntities.find(
          (entity) => entity.uuid === params.where.uuid,
        );
        Object.entries(params.data).map(([key, value]) => {
          entity[key] = value;
        });

        return Promise.resolve(entity);
      }),

    delete: jest
      .fn()
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      .mockImplementationOnce((params?: any) => {
        throw new Prisma.PrismaClientKnownRequestError('unknown request', {
          code: 'code',
          clientVersion: 'version',
        });
      })
      .mockImplementation((params: any) => {
        let found = false;

        fakeEntities.forEach((entity, index) => {
          if (entity.uuid === params?.where?.uuid) {
            found = true;
            fakeEntities.splice(index, 1);
          }
        });

        if (!found) {
          throw new Error();
        }
      }),

    deleteMany: jest
      .fn()
      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      .mockImplementationOnce((params?: any) => {
        throw new Prisma.PrismaClientKnownRequestError('unknown request', {
          code: 'code',
          clientVersion: 'version',
        });
      })
      .mockImplementation((params: any) => {
        let found = false;

        fakeEntities.forEach((entity, index) => {
          if (entity.uuid === params?.where?.uuid) {
            found = true;
            fakeEntities.splice(index, 1);
          }
        });

        if (!found) {
          throw new Error();
        }
      }),
  },
};

describe('PrismaRepository', () => {
  let fakeRepository: FakePrismaRepository;
  let prisma: FakePrismaService;

  beforeAll(async () => {
    const module: TestingModule = await Test.createTestingModule({
      providers: [
        FakePrismaRepository,
        {
          provide: PrismaService,
          useValue: mockPrismaService,
        },
      ],
    }).compile();

    fakeRepository = module.get<FakePrismaRepository>(FakePrismaRepository);
    prisma = module.get<PrismaService>(PrismaService) as FakePrismaService;
  });

  it('should be defined', () => {
    expect(fakeRepository).toBeDefined();
    expect(prisma).toBeDefined();
  });

  describe('findAll', () => {
    it('should return an array of entities', async () => {
      jest.spyOn(prisma.fake, 'findMany');
      jest.spyOn(prisma.fake, 'count');
      jest.spyOn(prisma, '$transaction');

      const entities = await fakeRepository.findAll();
      expect(entities).toStrictEqual({
        data: fakeEntities,
        total: fakeEntities.length,
      });
    });

    it('should return an array containing only one entity', async () => {
      const entities = await fakeRepository.findAll(1, 10, { limit: 1 });

      expect(prisma.fake.findMany).toHaveBeenCalledWith({
        skip: 0,
        take: 10,
        where: { limit: 1 },
      });
      expect(entities).toEqual({
        data: [fakeEntityCreated],
        total: 1,
      });
    });
  });

  describe('create', () => {
    it('should create an entity', async () => {
      jest.spyOn(prisma.fake, 'create');

      const newEntity = await fakeRepository.create(fakeEntityToCreate);
      expect(newEntity).toBe(fakeEntityCreated);
      expect(prisma.fake.create).toHaveBeenCalledTimes(1);
    });

    it('should throw a DatabaseException for client error', async () => {
      await expect(
        fakeRepository.create(fakeEntityToCreate),
      ).rejects.toBeInstanceOf(DatabaseException);
    });

    it('should throw a DatabaseException if uuid is not found', async () => {
      await expect(
        fakeRepository.create(fakeEntityToCreate),
      ).rejects.toBeInstanceOf(DatabaseException);
    });
  });

  describe('findOneByUuid', () => {
    it('should find an entity by uuid', async () => {
      const entity = await fakeRepository.findOneByUuid(fakeEntities[0].uuid);
      expect(entity).toBe(fakeEntities[0]);
    });

    it('should throw a DatabaseException for client error', async () => {
      await expect(
        fakeRepository.findOneByUuid('unknown'),
      ).rejects.toBeInstanceOf(DatabaseException);
    });

    it('should throw a DatabaseException if uuid is not found', async () => {
      await expect(
        fakeRepository.findOneByUuid('wrong-uuid'),
      ).rejects.toBeInstanceOf(DatabaseException);
    });
  });

  describe('findOne', () => {
    it('should find one entity', async () => {
      const entity = await fakeRepository.findOne({
        name: fakeEntities[0].name,
      });

      expect(entity.name).toBe(fakeEntities[0].name);
    });

    it('should throw a DatabaseException for client error', async () => {
      await expect(
        fakeRepository.findOne({
          name: fakeEntities[0].name,
        }),
      ).rejects.toBeInstanceOf(DatabaseException);
    });

    it('should throw a DatabaseException for unknown error', async () => {
      await expect(
        fakeRepository.findOne({
          name: fakeEntities[0].name,
        }),
      ).rejects.toBeInstanceOf(DatabaseException);
    });
  });

  describe('update', () => {
    it('should throw a DatabaseException for client error', async () => {
      await expect(
        fakeRepository.update('fake-uuid', { name: 'error' }),
      ).rejects.toBeInstanceOf(DatabaseException);
      await expect(
        fakeRepository.updateWhere({ name: 'error' }, { name: 'new error' }),
      ).rejects.toBeInstanceOf(DatabaseException);
    });

    it('should update an entity with name', async () => {
      const newName = 'new-random-name';

      await fakeRepository.updateWhere(
        { name: fakeEntities[0].name },
        {
          name: newName,
        },
      );
      expect(fakeEntities[0].name).toBe(newName);
    });

    it('should update an entity with uuid', async () => {
      const newName = 'random-name';

      await fakeRepository.update(fakeEntities[0].uuid, {
        name: newName,
      });
      expect(fakeEntities[0].name).toBe(newName);
    });

    it("should throw an exception if an entity doesn't exist", async () => {
      await expect(
        fakeRepository.update('fake-uuid', { name: 'error' }),
      ).rejects.toBeInstanceOf(DatabaseException);
      await expect(
        fakeRepository.updateWhere({ name: 'error' }, { name: 'new error' }),
      ).rejects.toBeInstanceOf(DatabaseException);
    });
  });

  describe('delete', () => {
    it('should throw a DatabaseException for client error', async () => {
      await expect(fakeRepository.delete('fake-uuid')).rejects.toBeInstanceOf(
        DatabaseException,
      );
    });

    it('should delete an entity', async () => {
      const savedUuid = fakeEntities[0].uuid;

      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      const res = await fakeRepository.delete(savedUuid);

      const deletedEntity = fakeEntities.find(
        (entity) => entity.uuid === savedUuid,
      );
      expect(deletedEntity).toBeUndefined();
    });

    it("should throw an exception if an entity doesn't exist", async () => {
      await expect(fakeRepository.delete('fake-uuid')).rejects.toBeInstanceOf(
        DatabaseException,
      );
    });
  });

  describe('deleteMany', () => {
    it('should throw a DatabaseException for client error', async () => {
      await expect(
        fakeRepository.deleteMany({ uuid: 'fake-uuid' }),
      ).rejects.toBeInstanceOf(DatabaseException);
    });

    it('should delete entities based on their uuid', async () => {
      const savedUuid = fakeEntities[0].uuid;

      // eslint-disable-next-line @typescript-eslint/no-unused-vars
      const res = await fakeRepository.deleteMany({ uuid: savedUuid });

      const deletedEntity = fakeEntities.find(
        (entity) => entity.uuid === savedUuid,
      );
      expect(deletedEntity).toBeUndefined();
    });

    it("should throw an exception if an entity doesn't exist", async () => {
      await expect(
        fakeRepository.deleteMany({ uuid: 'fake-uuid' }),
      ).rejects.toBeInstanceOf(DatabaseException);
    });
  });

  describe('findAllByquery', () => {
    it('should return an array of entities', async () => {
      const entities = await fakeRepository.findAllByQuery(
        ['uuid', 'name'],
        ['name is not null'],
      );
      expect(entities).toStrictEqual({
        data: fakeEntities,
        total: fakeEntities.length,
      });
    });
  });

  describe('createWithFields', () => {
    it('should create an entity', async () => {
      jest.spyOn(prisma, '$queryRawUnsafe');

      const newEntity = await fakeRepository.createWithFields({
        uuid: '804319b3-a09b-4491-9f82-7976bfce0aff',
        name: 'my-name',
      });
      expect(newEntity).toBe(fakeEntityCreated);
      expect(prisma.$queryRawUnsafe).toHaveBeenCalledTimes(1);
    });

    it('should throw a DatabaseException for client error', async () => {
      await expect(
        fakeRepository.createWithFields({
          uuid: '804319b3-a09b-4491-9f82-7976bfce0aff',
          name: 'my-name',
        }),
      ).rejects.toBeInstanceOf(DatabaseException);
    });

    it('should throw a DatabaseException if uuid is not found', async () => {
      await expect(
        fakeRepository.createWithFields({
          name: 'my-name',
        }),
      ).rejects.toBeInstanceOf(DatabaseException);
    });
  });

  describe('updateWithFields', () => {
    it('should update an entity', async () => {
      jest.spyOn(prisma, '$queryRawUnsafe');

      const updatedEntity = await fakeRepository.updateWithFields(
        '804319b3-a09b-4491-9f82-7976bfce0aff',
        {
          name: 'my-name',
        },
      );
      expect(updatedEntity).toBe(fakeEntityCreated);
      expect(prisma.$queryRawUnsafe).toHaveBeenCalledTimes(1);
    });

    it('should throw a DatabaseException for client error', async () => {
      await expect(
        fakeRepository.updateWithFields(
          '804319b3-a09b-4491-9f82-7976bfce0aff',
          {
            name: 'my-name',
          },
        ),
      ).rejects.toBeInstanceOf(DatabaseException);
    });

    it('should throw a DatabaseException if uuid is not found', async () => {
      await expect(
        fakeRepository.updateWithFields(
          '804319b3-a09b-4491-9f82-7976bfce0aff',
          {
            name: 'my-name',
          },
        ),
      ).rejects.toBeInstanceOf(DatabaseException);
    });
  });

  describe('healthCheck', () => {
    it('should throw a DatabaseException for client error', async () => {
      await expect(fakeRepository.healthCheck()).rejects.toBeInstanceOf(
        DatabaseException,
      );
    });

    it('should return a healthy result', async () => {
      const res = await fakeRepository.healthCheck();
      expect(res).toBeTruthy();
    });

    it('should throw an exception if database is not available', async () => {
      await expect(fakeRepository.healthCheck()).rejects.toBeInstanceOf(
        DatabaseException,
      );
    });
  });
});