import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import {
  setDebug,
  isDebugEnabled,
  logDebug,
  logError,
} from '../src/utils/logger';

describe('logger', () => {
  beforeEach(() => {
    setDebug(false);
  });

  afterEach(() => {
    vi.restoreAllMocks();
  });

  describe('setDebug', () => {
    it('should enable debug mode', () => {
      expect(isDebugEnabled()).toBe(false);
      setDebug(true);
      expect(isDebugEnabled()).toBe(true);
    });

    it('should disable debug mode', () => {
      setDebug(true);
      expect(isDebugEnabled()).toBe(true);
      setDebug(false);
      expect(isDebugEnabled()).toBe(false);
    });
  });

  describe('isDebugEnabled', () => {
    it('should return current debug state', () => {
      expect(isDebugEnabled()).toBe(false);
      setDebug(true);
      expect(isDebugEnabled()).toBe(true);
    });
  });

  describe('logDebug', () => {
    it('should not log when debug is disabled', () => {
      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
      logDebug('Test', 'This should not appear');
      expect(consoleSpy).not.toHaveBeenCalled();
    });

    it('should log message when debug is enabled', () => {
      setDebug(true);
      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
      logDebug('Test', 'This should appear');
      expect(consoleSpy).toHaveBeenCalled();
    });

    it('should log message with data when debug is enabled', () => {
      setDebug(true);
      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
      logDebug('Test', 'Message with data', { key: 'value', num: 123 });
      expect(consoleSpy).toHaveBeenCalled();
      const loggedMessage = consoleSpy.mock.calls[0].join(' ');
      expect(loggedMessage).toContain('[LightSDK][Test]');
      expect(loggedMessage).toContain('Message with data');
    });

    it('should include timestamp in log message', () => {
      setDebug(true);
      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
      logDebug('Module', 'Test message');
      expect(consoleSpy).toHaveBeenCalled();
      const loggedMessage = consoleSpy.mock.calls[0][0];
      expect(loggedMessage).toMatch(/^\[LightSDK\]\[Module\]/);
    });

    it('should handle message without data', () => {
      setDebug(true);
      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
      logDebug('Module', 'Simple message');
      expect(consoleSpy).toHaveBeenCalled();
    });

    it('should handle undefined data', () => {
      setDebug(true);
      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
      logDebug('Module', 'Message', undefined);
      expect(consoleSpy).toHaveBeenCalled();
    });

    it('should handle null data', () => {
      setDebug(true);
      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
      logDebug('Module', 'Message', null);
      expect(consoleSpy).toHaveBeenCalled();
    });

    it('should handle complex data objects', () => {
      setDebug(true);
      const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
      const complexData = {
        nested: { deeply: { value: 123 } },
        array: [1, 2, 3],
        bool: true,
        null: null,
      };
      logDebug('Module', 'Complex data', complexData);
      expect(consoleSpy).toHaveBeenCalled();
    });
  });

  describe('logError', () => {
    it('should always log errors even when debug is disabled', () => {
      setDebug(false);
      const consoleSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      logError('Test', 'This should always appear');
      expect(consoleSpy).toHaveBeenCalled();
      consoleSpy.mockRestore();
    });

    it('should log error message when debug is enabled', () => {
      setDebug(true);
      const consoleSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      logError('Test', 'This error should appear');
      expect(consoleSpy).toHaveBeenCalled();
      consoleSpy.mockRestore();
    });

    it('should include ERROR tag in log message', () => {
      const consoleSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      logError('Module', 'Error message');
      expect(consoleSpy).toHaveBeenCalled();
      const loggedMessage = consoleSpy.mock.calls[0][0];
      expect(loggedMessage).toContain('[LightSDK][Module][ERROR]');
      consoleSpy.mockRestore();
    });

    it('should log error with error data', () => {
      const consoleSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      const error = new Error('Test error');
      logError('Module', 'Error occurred', error);
      expect(consoleSpy).toHaveBeenCalled();
      consoleSpy.mockRestore();
    });

    it('should handle plain object error', () => {
      const consoleSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      const errorObj = { status: 404, message: 'Not found' };
      logError('Module', 'Request failed', errorObj);
      expect(consoleSpy).toHaveBeenCalled();
      consoleSpy.mockRestore();
    });

    it('should handle error message without data', () => {
      const consoleSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      logError('Module', 'Simple error');
      expect(consoleSpy).toHaveBeenCalled();
      consoleSpy.mockRestore();
    });

    it('should handle string error', () => {
      const consoleSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      logError('Module', 'String error', 'error details');
      expect(consoleSpy).toHaveBeenCalled();
      consoleSpy.mockRestore();
    });

    it('should handle undefined error', () => {
      const consoleSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      logError('Module', 'Error without details', undefined);
      expect(consoleSpy).toHaveBeenCalled();
      consoleSpy.mockRestore();
    });
  });

  describe('debug toggle behavior', () => {
    it('should toggle debug logs between enabled and disabled', () => {
      const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
      const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});

      setDebug(true);
      logDebug('Test', 'Debug on');
      expect(consoleLogSpy).toHaveBeenCalled();

      setDebug(false);
      logDebug('Test', 'Debug off');
      expect(consoleLogSpy).toHaveBeenCalledTimes(1);

      // logError should always work regardless of debug flag
      setDebug(true);
      logError('Test', 'Error on');
      const errorCallCountWhenOn = consoleWarnSpy.mock.calls.length;
      expect(errorCallCountWhenOn).toBeGreaterThan(0);

      setDebug(false);
      logError('Test', 'Error off');
      expect(consoleWarnSpy).toHaveBeenCalledTimes(errorCallCountWhenOn + 1);

      consoleLogSpy.mockRestore();
      consoleWarnSpy.mockRestore();
    });
  });
});