/**
 * Simplified tests for BLE cleanup functionality
 *
 * This test suite verifies that BLE managers implement cleanup correctly
 * without importing complex api modules that cause test issues.
 */

import { RealBLEManager } from '@/services/ble/BLEManager';
import { MockBLEManager } from '@/services/ble/MockBLEManager';
import type { IBLEManager } from '@/services/ble/types';

describe('BLE Manager Cleanup', () => {
  describe('MockBLEManager', () => {
    let bleManager: IBLEManager;

    beforeEach(() => {
      bleManager = new MockBLEManager();
    });

    it('should have cleanup method', () => {
      expect(bleManager.cleanup).toBeDefined();
      expect(typeof bleManager.cleanup).toBe('function');
    });

    it('should disconnect all connected devices on cleanup', async () => {
      // Scan for devices
      const devices = await bleManager.scanDevices();
      expect(devices.length).toBeGreaterThan(0);

      // Connect to first device
      const deviceId = devices[0].id;
      const connected = await bleManager.connectDevice(deviceId);
      expect(connected).toBe(true);

      // Cleanup should not throw
      await expect(bleManager.cleanup()).resolves.not.toThrow();
    });

    it('should handle cleanup with no connected devices', async () => {
      // Cleanup with no connections should not throw
      await expect(bleManager.cleanup()).resolves.not.toThrow();
    });

    it('should handle multiple cleanup calls', async () => {
      // Multiple cleanups should be idempotent
      await bleManager.cleanup();
      await expect(bleManager.cleanup()).resolves.not.toThrow();
    });

    it('should stop scanning before cleanup', async () => {
      // Start a scan (will complete quickly with mock)
      await bleManager.scanDevices();

      // Cleanup should not throw
      await expect(bleManager.cleanup()).resolves.not.toThrow();
    });
  });

  describe('RealBLEManager', () => {
    let bleManager: IBLEManager;

    beforeEach(() => {
      bleManager = new RealBLEManager();
    });

    it('should have cleanup method', () => {
      expect(bleManager.cleanup).toBeDefined();
      expect(typeof bleManager.cleanup).toBe('function');
    });

    it('cleanup should return a Promise', () => {
      const result = bleManager.cleanup();
      expect(result).toBeInstanceOf(Promise);
    });

    it('should handle cleanup with no connected devices', async () => {
      // Cleanup with no connections should not throw
      await expect(bleManager.cleanup()).resolves.not.toThrow();
    });

    it('should handle multiple cleanup calls', async () => {
      // Multiple cleanups should be idempotent
      await bleManager.cleanup();
      await expect(bleManager.cleanup()).resolves.not.toThrow();
    });
  });

  describe('Cleanup Flow', () => {
    it('should demonstrate proper logout cleanup flow', async () => {
      // Simulate the logout flow
      const mockClearBeneficiary = jest.fn().mockResolvedValue(undefined);
      const mockCleanupBLE = jest.fn().mockResolvedValue(undefined);
      const mockLogout = jest.fn().mockResolvedValue(undefined);

      // Simulate the logout handler from profile screen
      const handleLogout = async () => {
        await mockClearBeneficiary();
        await mockCleanupBLE();
        await mockLogout();
      };

      await handleLogout();

      // Verify all steps executed
      expect(mockClearBeneficiary).toHaveBeenCalled();
      expect(mockCleanupBLE).toHaveBeenCalled();
      expect(mockLogout).toHaveBeenCalled();

      // Verify order: clear beneficiary → cleanup BLE → logout
      const clearOrder = mockClearBeneficiary.mock.invocationCallOrder[0];
      const cleanupOrder = mockCleanupBLE.mock.invocationCallOrder[0];
      const logoutOrder = mockLogout.mock.invocationCallOrder[0];

      expect(clearOrder).toBeLessThan(cleanupOrder);
      expect(cleanupOrder).toBeLessThan(logoutOrder);
    });

    it('should handle BLE cleanup errors gracefully', async () => {
      const mockCleanupBLE = jest.fn().mockRejectedValue(new Error('BLE error'));
      const mockLogout = jest.fn().mockResolvedValue(undefined);

      // Simulate error handling
      const handleLogout = async () => {
        try {
          await mockCleanupBLE();
        } catch (error) {
          // Log but continue
          console.log('BLE cleanup failed, continuing with logout');
        }
        await mockLogout();
      };

      // Should not throw
      await expect(handleLogout()).resolves.not.toThrow();

      // Logout should still be called
      expect(mockLogout).toHaveBeenCalled();
    });

    it('should verify cleanup is idempotent', async () => {
      const bleManager = new MockBLEManager();

      // Multiple cleanups should work
      await bleManager.cleanup();
      await bleManager.cleanup();
      await bleManager.cleanup();

      // No errors should occur
      expect(true).toBe(true);
    });
  });

  describe('Callback Pattern', () => {
    it('should support callback registration pattern', () => {
      let registeredCallback: (() => Promise<void>) | null = null;

      // Simulate setOnLogoutBLECleanupCallback
      const setCallback = (callback: (() => Promise<void>) | null) => {
        registeredCallback = callback;
      };

      // Register a cleanup function
      const mockCleanup = jest.fn().mockResolvedValue(undefined);
      setCallback(mockCleanup);

      expect(registeredCallback).toBe(mockCleanup);
    });

    it('should allow clearing the callback', () => {
      let registeredCallback: (() => Promise<void>) | null = null;

      const setCallback = (callback: (() => Promise<void>) | null) => {
        registeredCallback = callback;
      };

      // Set then clear
      const mockCleanup = jest.fn().mockResolvedValue(undefined);
      setCallback(mockCleanup);
      expect(registeredCallback).toBe(mockCleanup);

      setCallback(null);
      expect(registeredCallback).toBeNull();
    });

    it('should maintain stable callback reference with ref pattern', () => {
      // Simulate the ref pattern from _layout.tsx
      const cleanupFn = jest.fn().mockResolvedValue(undefined);
      const cleanupRef = { current: cleanupFn };

      // Create wrapper that uses ref
      const stableCallback = () => cleanupRef.current();

      // Even if cleanupRef.current changes, stableCallback remains the same
      const newCleanupFn = jest.fn().mockResolvedValue(undefined);
      cleanupRef.current = newCleanupFn;

      // Call the stable callback
      stableCallback();

      // Should call the NEW cleanup function
      expect(newCleanupFn).toHaveBeenCalled();
      expect(cleanupFn).not.toHaveBeenCalled();
    });
  });
});