import { BadRequestException } from '@nestjs/common';
import { Test, TestingModule } from '@nestjs/testing';
import { PrismaService } from '../prisma/prisma.service';
import { LogService } from '../log/log.service';
import { ActiveUserPayload } from '../auth/decorator/current-user.decorator';
import { CreateObatDto } from './dto/create-obat-dto';
import { UpdateObatDto } from './dto/update-obat-dto';
import { ObatService } from './obat.service';

type PrismaDelegate<T> = {
  findMany: jest.Mock;
  findUnique: jest.Mock;
  count: jest.Mock;
  create: jest.Mock;
  update: jest.Mock;
};

const createPrismaMock = () => ({
  pemberian_obat: {
    findMany: jest.fn(),
    findUnique: jest.fn(),
    count: jest.fn(),
    create: jest.fn(),
    update: jest.fn(),
  } as PrismaDelegate<any>,
  rekam_medis: {
    findUnique: jest.fn(),
  },
});

const createLogServiceMock = () => ({
  storeLog: jest.fn(),
  getLogById: jest.fn(),
});

const mockUser: ActiveUserPayload = {
  sub: 1,
  username: 'tester',
  role: 'admin' as any,
  csrf: 'token',
};

describe('ObatService', () => {
  let service: ObatService;
  let prisma: ReturnType<typeof createPrismaMock>;
  let logService: ReturnType<typeof createLogServiceMock>;

  beforeEach(async () => {
    prisma = createPrismaMock();
    logService = createLogServiceMock();

    const module: TestingModule = await Test.createTestingModule({
      providers: [
        ObatService,
        { provide: PrismaService, useValue: prisma },
        { provide: LogService, useValue: logService },
      ],
    }).compile();

    service = module.get<ObatService>(ObatService);
  });

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

  describe('getAllObat', () => {
    it('returns paginated data and total count', async () => {
      prisma.pemberian_obat.findMany.mockResolvedValueOnce([
        { id: 1, obat: 'Paracetamol' },
      ]);
      prisma.pemberian_obat.count.mockResolvedValueOnce(10);

      const result = await service.getAllObat({
        take: 10,
        page: 1,
        orderBy: { id: 'asc' },
        order: 'asc',
        obat: 'Para',
      });

      expect(prisma.pemberian_obat.findMany).toHaveBeenCalledWith({
        skip: 0,
        take: 10,
        where: {
          obat: { contains: 'Para' },
        },
        orderBy: { id: 'asc' },
      });
      expect(prisma.pemberian_obat.count).toHaveBeenCalledWith({
        where: {
          obat: { contains: 'Para' },
        },
      });
      expect(result).toEqual({
        0: { id: 1, obat: 'Paracetamol' },
        totalCount: 10,
      });
    });
  });

  describe('createObat', () => {
    const payload: CreateObatDto = {
      id_visit: 'VISIT-1',
      obat: 'Amoxicillin',
      jumlah_obat: 2,
      aturan_pakai: '3x1',
    };

    it('throws when visit not found', async () => {
      prisma.rekam_medis.findUnique.mockResolvedValueOnce(null);

      await expect(service.createObat(payload, mockUser)).rejects.toThrow(
        BadRequestException,
      );
      expect(prisma.pemberian_obat.create).not.toHaveBeenCalled();
    });

    it('creates obat and stores log', async () => {
      prisma.rekam_medis.findUnique.mockResolvedValueOnce({
        id_visit: 'VISIT-1',
      });
      prisma.pemberian_obat.create.mockResolvedValueOnce({
        id: 42,
        ...payload,
      });
      logService.storeLog.mockResolvedValueOnce({ txId: 'abc' });

      const result = await service.createObat(payload, mockUser);

      expect(prisma.pemberian_obat.create).toHaveBeenCalledWith({
        data: {
          id_visit: 'VISIT-1',
          obat: 'Amoxicillin',
          jumlah_obat: 2,
          aturan_pakai: '3x1',
        },
      });

      expect(logService.storeLog).toHaveBeenCalledWith({
        id: 'OBAT_42',
        event: 'obat_created',
        user_id: mockUser.sub,
        payload: expect.any(String),
      });

      expect(result).toEqual({
        id: 42,
        id_visit: 'VISIT-1',
        obat: 'Amoxicillin',
        jumlah_obat: 2,
        aturan_pakai: '3x1',
        txId: 'abc',
      });
    });
  });

  describe('updateObatById', () => {
    const updatePayload: UpdateObatDto = {
      obat: 'Ibuprofen',
      jumlah_obat: 1,
      aturan_pakai: '2x1',
    };

    it('updates obat and stores log', async () => {
      prisma.pemberian_obat.update.mockResolvedValueOnce({
        id: 99,
        id_visit: 'VISIT-1',
        ...updatePayload,
      });
      logService.storeLog.mockResolvedValueOnce({ txId: 'updated' });

      const result = await service.updateObatById(99, updatePayload, mockUser);

      expect(prisma.pemberian_obat.update).toHaveBeenCalledWith({
        where: { id: 99 },
        data: {
          obat: 'Ibuprofen',
          jumlah_obat: 1,
          aturan_pakai: '2x1',
        },
      });

      expect(logService.storeLog).toHaveBeenCalledWith({
        id: 'OBAT_99',
        event: 'obat_updated',
        user_id: mockUser.sub,
        payload: expect.any(String),
      });

      expect(result).toEqual({
        id: 99,
        id_visit: 'VISIT-1',
        obat: 'Ibuprofen',
        jumlah_obat: 1,
        aturan_pakai: '2x1',
        txId: 'updated',
      });
    });
  });

  describe('getLogObatById', () => {
    it('returns processed logs and tamper status', async () => {
      prisma.pemberian_obat.findUnique.mockResolvedValueOnce({
        id: 5,
        obat: 'Paracetamol',
        jumlah_obat: 1,
        aturan_pakai: '3x1',
      });
      const expectedHash = service.createHashingPayload({
        obat: 'Paracetamol',
        jumlah_obat: 1,
        aturan_pakai: '3x1',
      });

      logService.getLogById.mockResolvedValueOnce([
        {
          value: {
            event: 'obat_created',
            payload: expectedHash,
            timestamp: '2024-01-01T00:00:00Z',
            user_id: 1,
          },
          txId: 'abc',
        },
      ]);

      const result = await service.getLogObatById('5');

      expect(logService.getLogById).toHaveBeenCalledWith('OBAT_5');
      expect(result).toEqual({
        logs: [
          {
            event: 'obat_created',
            payload: expectedHash,
            timestamp: '2024-01-01T00:00:00Z',
            user_id: 1,
            txId: 'abc',
            status: 'ORIGINAL',
          },
        ],
        isTampered: false,
        currentDataHash: expectedHash,
      });
    });
  });
});