import { api } from '@/services/api';
import * as SecureStore from 'expo-secure-store';

// Mock dependencies
jest.mock('expo-secure-store');
jest.mock('expo-file-system');

// Mock fetch globally
global.fetch = jest.fn();

describe('API - Sensor Attachment Error Handling', () => {
  const mockBeneficiaryId = '123';
  const mockWellId = 497;
  const mockDeviceMac = '142B2F81A14C';
  const mockDeploymentId = 22;
  // Use 'robster' to match DEMO_LEGACY_USER in api.ts
  const mockUserName = 'robster';

  // Create a mock JWT with expiration far in the future
  const createMockJWT = () => {
    const header = btoa(JSON.stringify({ alg: 'HS256', typ: 'JWT' }));
    const payload = btoa(JSON.stringify({
      sub: mockUserName,
      exp: Math.floor(Date.now() / 1000) + 3600, // expires in 1 hour
    }));
    const signature = 'mock-signature';
    return `${header}.${payload}.${signature}`;
  };

  const mockToken = createMockJWT();

  beforeEach(() => {
    jest.clearAllMocks();

    // Reset SecureStore mock to default implementation
    // legacyAccessToken needs to be a valid JWT format with valid expiration
    (SecureStore.getItemAsync as jest.Mock).mockImplementation((key: string) => {
      if (key === 'accessToken') return Promise.resolve('mock-jwt-token');
      if (key === 'userId') return Promise.resolve('user-123');
      if (key === 'userEmail') return Promise.resolve('test@example.com');
      if (key === 'legacyAccessToken') return Promise.resolve(mockToken);
      if (key === 'legacyUserName') return Promise.resolve(mockUserName);
      if (key === 'legacyUserId') return Promise.resolve('legacy-user-123');
      return Promise.resolve(null);
    });
  });

  describe('attachDeviceToBeneficiary', () => {
    it('should handle deployment not found error', async () => {
      // Mock getDeploymentForBeneficiary to return beneficiary without deployment
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            lastName: 'Garcia',
            // No deploymentId
          })
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('DEPLOYMENT_NOT_FOUND');
      expect(result.error?.message).toContain('Could not find beneficiary deployment');
      expect(result.error?.status).toBe(404);
    });

    it('should handle missing authentication credentials', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        });

      // Mock missing legacy credentials
      (SecureStore.getItemAsync as jest.Mock).mockImplementation((key: string) => {
        if (key === 'accessToken') return Promise.resolve('mock-jwt-token');
        // Return null for legacy credentials
        return Promise.resolve(null);
      });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('UNAUTHORIZED');
      expect(result.error?.message).toContain('Not authenticated');
      expect(result.error?.status).toBe(401);
    });

    it('should handle 401 Unauthorized from Legacy API', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock 401 response from Legacy API
        .mockResolvedValueOnce({
          ok: false,
          status: 401,
          json: async () => ({ message: 'Invalid credentials' })
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('UNAUTHORIZED');
      expect(result.error?.message).toMatch(/Authentication expired|Not authenticated/);
      expect(result.error?.status).toBe(401);
    });

    it('should handle 404 Not Found from Legacy API', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock 404 response from Legacy API
        .mockResolvedValueOnce({
          ok: false,
          status: 404,
          json: async () => ({ message: 'Device not found' })
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('NOT_FOUND');
      expect(result.error?.message).toContain('Sensor or deployment not found');
      expect(result.error?.status).toBe(404);
    });

    it('should handle 500 Server Error from Legacy API', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock 500 response from Legacy API
        .mockResolvedValueOnce({
          ok: false,
          status: 500,
          json: async () => ({ message: 'Internal server error' })
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('SERVER_ERROR');
      expect(result.error?.message).toContain('Server error');
      expect(result.error?.status).toBe(500);
    });

    it('should handle 503 Service Unavailable from Legacy API', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock 503 response from Legacy API
        .mockResolvedValueOnce({
          ok: false,
          status: 503,
          json: async () => ({ message: 'Service unavailable' })
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('SERVICE_UNAVAILABLE');
      expect(result.error?.message).toContain('Service unavailable');
      expect(result.error?.status).toBe(503);
    });

    it('should handle Legacy API error status in response body', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock successful HTTP but error status in body
        .mockResolvedValueOnce({
          ok: true,
          status: 200,
          json: async () => ({
            status: '400 Bad Request',
            message: 'Invalid device MAC address format'
          })
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('LEGACY_API_ERROR');
      expect(result.error?.message).toBe('Invalid device MAC address format');
    });

    it('should handle network errors', async () => {
      // Mock successful beneficiary lookup first
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Then mock network error on Legacy API call
        .mockRejectedValueOnce(
          new Error('fetch failed')
        );

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('NETWORK_ERROR');
      expect(result.error?.message).toContain('No internet connection');
    });

    it('should handle unexpected exceptions', async () => {
      // Mock successful beneficiary lookup first
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Then mock unexpected error
        .mockRejectedValueOnce(
          new Error('Unexpected error occurred')
        );

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('EXCEPTION');
      expect(result.error?.message).toContain('unexpected error');
    });

    it('should successfully attach device when all is well', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock successful device_form response
        .mockResolvedValueOnce({
          ok: true,
          status: 200,
          json: async () => ({
            status: '200 OK',
            message: 'Device attached successfully'
          })
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(true);
      expect(result.data).toEqual({ success: true });
      expect(result.error).toBeUndefined();
    });

    it('should send correct request parameters to Legacy API', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock successful device_form response
        .mockResolvedValueOnce({
          ok: true,
          status: 200,
          json: async () => ({
            status: '200 OK'
          })
        });

      await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      // Verify the second fetch call (device_form)
      const secondCall = (global.fetch as jest.Mock).mock.calls[1];
      expect(secondCall[0]).toBe('https://eluxnetworks.net/function/well-api/api');
      expect(secondCall[1].method).toBe('POST');
      expect(secondCall[1].headers['Content-Type']).toBe('application/x-www-form-urlencoded');

      // Verify request body contains correct parameters
      const bodyString = secondCall[1].body;
      expect(bodyString).toContain('function=device_form');
      expect(bodyString).toContain(`well_id=${mockWellId}`);
      expect(bodyString).toContain(`device_mac=${mockDeviceMac.toUpperCase()}`);
      expect(bodyString).toContain(`deployment_id=${mockDeploymentId}`);
      expect(bodyString).toContain(`user_name=${mockUserName}`);
      // Token will be URL encoded in the body, so just check it contains the token
      expect(bodyString).toContain('token=');
    });

    it('should handle 403 Forbidden from Legacy API', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock 403 response from Legacy API
        .mockResolvedValueOnce({
          ok: false,
          status: 403,
          json: async () => ({ message: 'Access denied' })
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('UNAUTHORIZED');
      expect(result.error?.message).toMatch(/Authentication expired/);
      expect(result.error?.status).toBe(403);
    });

    it('should handle 429 Rate Limit from Legacy API', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock 429 response from Legacy API
        .mockResolvedValueOnce({
          ok: false,
          status: 429,
          json: async () => ({ message: 'Too many requests' })
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('RATE_LIMITED');
      expect(result.error?.message).toContain('Too many requests');
      expect(result.error?.status).toBe(429);
    });

    it('should handle JSON parse errors gracefully', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock response with invalid JSON
        .mockResolvedValueOnce({
          ok: true,
          status: 200,
          json: async () => { throw new SyntaxError('Unexpected token'); }
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('EXCEPTION');
    });

    it('should handle WellNuo API failure when getting beneficiary', async () => {
      // Mock failed beneficiary lookup from WellNuo API
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: false,
          status: 500,
          json: async () => ({ message: 'Internal error' })
        });

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('DEPLOYMENT_NOT_FOUND');
      expect(result.error?.status).toBe(404);
    });

    it('should handle timeout errors', async () => {
      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock timeout error
        .mockRejectedValueOnce(
          new Error('network request failed: timeout')
        );

      const result = await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        mockDeviceMac
      );

      expect(result.ok).toBe(false);
      expect(result.error?.code).toBe('NETWORK_ERROR');
      expect(result.error?.message).toContain('No internet connection');
    });

    it('should uppercase device MAC address in request', async () => {
      const lowercaseMac = '142b2f81a14c';

      // Mock successful beneficiary lookup
      (global.fetch as jest.Mock)
        .mockResolvedValueOnce({
          ok: true,
          json: async () => ({
            id: 123,
            firstName: 'Maria',
            deploymentId: mockDeploymentId
          })
        })
        // Mock successful device_form response
        .mockResolvedValueOnce({
          ok: true,
          status: 200,
          json: async () => ({
            status: '200 OK'
          })
        });

      await api.attachDeviceToBeneficiary(
        mockBeneficiaryId,
        mockWellId,
        lowercaseMac
      );

      // Verify MAC is uppercased
      const secondCall = (global.fetch as jest.Mock).mock.calls[1];
      const bodyString = secondCall[1].body;
      expect(bodyString).toContain(`device_mac=${lowercaseMac.toUpperCase()}`);
      expect(bodyString).not.toContain(`device_mac=${lowercaseMac}`);
    });
  });
});