import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import Client from '../src/core/Client';
import { setAnonymousId } from '../src/utils/identity';

describe('SDK Error Safety', () => {
  const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
  const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});

  beforeEach(() => {
    vi.clearAllMocks();
  });

  afterAll(() => {
    consoleWarnSpy.mockRestore();
    consoleLogSpy.mockRestore();
  });

  describe('Client public methods should not throw', () => {
    let client: Client;

    beforeEach(() => {
      client = new Client({
        dsn: 'https://proj_abc123@log.example.com/1001',
      });
    });

    afterEach(() => {
      client.destroy();
    });

    it('captureException should not throw on invalid input', () => {
      expect(() => {
        client.captureException(null as unknown as Error);
      }).not.toThrow();
    });

    it('captureException should not throw on undefined input', () => {
      expect(() => {
        client.captureException(undefined);
      }).not.toThrow();
    });

    it('captureException should not throw when SDK is disabled', () => {
      client.disable();
      expect(() => {
        client.captureException(new Error('test'));
      }).not.toThrow();
    });

    it('captureMessage should not throw on empty message', () => {
      expect(() => {
        client.captureMessage('');
      }).not.toThrow();
    });

    it('captureMessage should not throw when SDK is disabled', () => {
      client.disable();
      expect(() => {
        client.captureMessage('test');
      }).not.toThrow();
    });

    it('captureEvent should not throw on minimal event', () => {
      expect(() => {
        client.captureEvent({ type: 'custom' });
      }).not.toThrow();
    });

    it('captureEvent should not throw when SDK is disabled', () => {
      client.disable();
      expect(() => {
        client.captureEvent({ type: 'custom' });
      }).not.toThrow();
    });

    it('setUser should not throw on null input', () => {
      expect(() => {
        client.setUser(null);
      }).not.toThrow();
    });

    it('setUser should not throw on valid input', () => {
      expect(() => {
        client.setUser({ id: '123', username: 'test' });
      }).not.toThrow();
    });

    it('setTag should not throw', () => {
      expect(() => {
        client.setTag('key', 'value');
      }).not.toThrow();
    });

    it('setTags should not throw', () => {
      expect(() => {
        client.setTags({ key1: 'val1', key2: 'val2' });
      }).not.toThrow();
    });

    it('setExtra should not throw', () => {
      expect(() => {
        client.setExtra('key', { nested: true });
      }).not.toThrow();
    });

    it('addBreadcrumb should not throw', () => {
      expect(() => {
        client.addBreadcrumb({
          type: 'default',
          message: 'test breadcrumb',
          level: 'info',
        });
      }).not.toThrow();
    });

    it('addBreadcrumb should not throw on empty breadcrumb', () => {
      expect(() => {
        client.addBreadcrumb({
          type: 'default',
        });
      }).not.toThrow();
    });

    it('startTransaction should not throw', () => {
      expect(() => {
        client.startTransaction({ name: 'test-tx', op: 'test' });
      }).not.toThrow();
    });

    it('startTransaction should not throw when SDK is disabled', () => {
      client.disable();
      const result = client.startTransaction({ name: 'test-tx', op: 'test' });
      expect(result).toBeNull();
    });

    it('getCurrentTransaction should not throw', () => {
      expect(() => {
        client.getCurrentTransaction();
      }).not.toThrow();
    });

    it('getCurrentSpan should not throw', () => {
      expect(() => {
        client.getCurrentSpan();
      }).not.toThrow();
    });

    it('setSpan should not throw', () => {
      expect(() => {
        client.setSpan(null);
      }).not.toThrow();
    });

    it('startSpan should not throw', () => {
      expect(() => {
        client.startSpan({ name: 'test-span', op: 'test' });
      }).not.toThrow();
    });

    it('startSpan should not throw when SDK is disabled', () => {
      client.disable();
      const result = client.startSpan({ name: 'test-span', op: 'test' });
      expect(result).toBeNull();
    });

    it('disable should not throw', () => {
      expect(() => {
        client.disable();
      }).not.toThrow();
    });

    it('enable should not throw', () => {
      expect(() => {
        client.enable();
      }).not.toThrow();
    });

    it('use should not throw on valid plugin', () => {
      const plugin = {
        name: 'test-plugin',
        setup: vi.fn(),
      };
      expect(() => {
        client.use(plugin);
      }).not.toThrow();
    });

    it('use should not throw when plugin setup throws', () => {
      const plugin = {
        name: 'bad-plugin',
        setup: () => {
          throw new Error('setup failed');
        },
      };
      expect(() => {
        client.use(plugin);
      }).not.toThrow();
    });

    it('flush should not throw', async () => {
      await expect(client.flush()).resolves.not.toThrow();
    });

    it('destroy should not throw', () => {
      expect(() => {
        client.destroy();
      }).not.toThrow();
    });

    it('init should not throw', () => {
      const newClient = new Client({
        dsn: 'https://proj_abc123@log.example.com/1001',
      });
      expect(() => {
        newClient.init();
      }).not.toThrow();
      newClient.destroy();
    });

    it('setAnonymousId should not throw', () => {
      expect(() => {
        client.setAnonymousId('test-anon-id');
      }).not.toThrow();
    });

    it('on/off/emit should not throw', () => {
      const handler = vi.fn();
      expect(() => {
        client.on('test', handler);
      }).not.toThrow();
      expect(() => {
        client.emit('test', 'data');
      }).not.toThrow();
      expect(() => {
        client.off('test', handler);
      }).not.toThrow();
    });

    it('event handler errors should not affect other handlers', () => {
      const handler1 = vi.fn(() => {
        throw new Error('handler1 failed');
      });
      const handler2 = vi.fn();

      client.on('test-event', handler1);
      client.on('test-event', handler2);

      expect(() => {
        client.emit('test-event', 'data');
      }).not.toThrow();

      expect(handler1).toHaveBeenCalled();
      expect(handler2).toHaveBeenCalled();
    });
  });

  describe('Config edge cases', () => {
    it('should throw on missing DSN (config error, not SDK bug)', () => {
      expect(() => {
        new Client({ dsn: '' });
      }).toThrow();
    });

    it('should throw on undefined DSN', () => {
      expect(() => {
        new Client({ dsn: undefined as unknown as string });
      }).toThrow();
    });
  });
});