// ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========

import { act, renderHook } from '@testing-library/react';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { useInstallationSetup } from '../../../src/hooks/useInstallationSetup';
import { useAuthStore } from '../../../src/store/authStore';
import { useInstallationStore } from '../../../src/store/installationStore';
import {
  setupElectronMocks,
  TestScenarios,
  type MockedElectronAPI,
} from '../../mocks/electronMocks';

// Mock the stores
vi.mock('../../../src/store/installationStore');
vi.mock('../../../src/store/authStore');

describe('useInstallationSetup Hook', () => {
  let electronAPI: MockedElectronAPI;
  let mockInstallationStore: any;
  let mockAuthStore: any;

  beforeEach(() => {
    // Set up electron mocks
    const mocks = setupElectronMocks();
    electronAPI = mocks.electronAPI;

    // Mock installation store
    mockInstallationStore = {
      startInstallation: vi.fn(),
      addLog: vi.fn(),
      setSuccess: vi.fn(),
      setError: vi.fn(),
    };

    // Mock auth store
    mockAuthStore = {
      initState: 'done',
      setInitState: vi.fn(),
    };

    // Set up mock implementations
    vi.mocked(useInstallationStore).mockImplementation((selector: any) => {
      if (typeof selector === 'function') {
        return selector(mockInstallationStore);
      }
      return mockInstallationStore;
    });

    vi.mocked(useAuthStore).mockReturnValue(mockAuthStore);

    // Mock console.log to avoid noise in tests
    vi.spyOn(console, 'log').mockImplementation(() => {});
    vi.spyOn(console, 'error').mockImplementation(() => {});
  });

  afterEach(() => {
    vi.clearAllMocks();
    electronAPI.reset();
  });

  describe('Initial Setup', () => {
    it('should check tool installation status on mount', async () => {
      // Mock IPC response for tool check
      electronAPI.mockState.toolInstalled = true;

      renderHook(() => useInstallationSetup());

      await vi.waitFor(() => {
        expect(window.ipcRenderer.invoke).toHaveBeenCalledWith(
          'check-tool-installed'
        );
      });
    });

    it('should check backend installation status on mount', async () => {
      renderHook(() => useInstallationSetup());

      await vi.waitFor(() => {
        expect(electronAPI.getInstallationStatus).toHaveBeenCalled();
      });
    });

    it('should start installation if backend installation is in progress', async () => {
      electronAPI.mockState.isInstalling = true;

      renderHook(() => useInstallationSetup());

      await vi.waitFor(() => {
        expect(mockInstallationStore.startInstallation).toHaveBeenCalled();
      });
    });

    it('should set initState to carousel if tool is not installed', async () => {
      // Set initial state to carousel (as would happen on fresh startup)
      mockAuthStore.initState = 'carousel';

      // Mock tool not installed
      window.ipcRenderer.invoke = vi.fn().mockResolvedValue({
        success: true,
        isInstalled: false,
      });

      renderHook(() => useInstallationSetup());

      await vi.waitFor(() => {
        expect(mockAuthStore.setInitState).toHaveBeenCalledWith('carousel');
      });
    });
  });

  describe('Electron IPC Event Handling', () => {
    it('should register all required event listeners', () => {
      renderHook(() => useInstallationSetup());

      expect(electronAPI.onInstallDependenciesStart).toHaveBeenCalled();
      expect(electronAPI.onInstallDependenciesLog).toHaveBeenCalled();
      expect(electronAPI.onInstallDependenciesComplete).toHaveBeenCalled();
    });

    it('should handle install-dependencies-start event', () => {
      renderHook(() => useInstallationSetup());

      // Get the registered callback
      const startCallback =
        electronAPI.onInstallDependenciesStart.mock.calls[0][0];

      act(() => {
        startCallback();
      });

      expect(mockInstallationStore.startInstallation).toHaveBeenCalled();
    });

    it('should handle install-dependencies-log event', () => {
      renderHook(() => useInstallationSetup());

      // Get the registered callback
      const logCallback = electronAPI.onInstallDependenciesLog.mock.calls[0][0];
      const logData = { type: 'stdout', data: 'Installing packages...' };

      act(() => {
        logCallback(logData);
      });

      expect(mockInstallationStore.addLog).toHaveBeenCalledWith({
        type: 'stdout',
        data: 'Installing packages...',
        timestamp: expect.any(Date),
      });
    });

    it('should handle install-dependencies-complete event with success', () => {
      renderHook(() => useInstallationSetup());

      // Get the registered callback
      const completeCallback =
        electronAPI.onInstallDependenciesComplete.mock.calls[0][0];
      const completeData = { success: true };

      act(() => {
        completeCallback(completeData);
      });

      expect(mockInstallationStore.setSuccess).toHaveBeenCalled();
      expect(mockAuthStore.setInitState).toHaveBeenCalledWith('done');
    });

    it('should handle install-dependencies-complete event with failure', () => {
      renderHook(() => useInstallationSetup());

      // Get the registered callback
      const completeCallback =
        electronAPI.onInstallDependenciesComplete.mock.calls[0][0];
      const completeData = { success: false, error: 'Installation failed' };

      act(() => {
        completeCallback(completeData);
      });

      expect(mockInstallationStore.setError).toHaveBeenCalledWith(
        'Installation failed'
      );
      expect(mockAuthStore.setInitState).not.toHaveBeenCalledWith('done');
    });

    it('should handle complete event without error message', () => {
      renderHook(() => useInstallationSetup());

      const completeCallback =
        electronAPI.onInstallDependenciesComplete.mock.calls[0][0];
      const completeData = { success: false };

      act(() => {
        completeCallback(completeData);
      });

      expect(mockInstallationStore.setError).toHaveBeenCalledWith(
        'Installation failed'
      );
    });
  });

  describe('Event Listener Cleanup', () => {
    it('should remove all event listeners on unmount', () => {
      const { unmount } = renderHook(() => useInstallationSetup());

      unmount();

      expect(electronAPI.removeAllListeners).toHaveBeenCalledWith(
        'install-dependencies-start'
      );
      expect(electronAPI.removeAllListeners).toHaveBeenCalledWith(
        'install-dependencies-log'
      );
      expect(electronAPI.removeAllListeners).toHaveBeenCalledWith(
        'install-dependencies-complete'
      );
    });
  });

  describe('Test Scenarios Integration', () => {
    it('should handle fresh installation scenario', async () => {
      TestScenarios.freshInstall(electronAPI);

      // Set initial state to carousel (as would happen on fresh startup)
      mockAuthStore.initState = 'carousel';

      // Mock tool not installed
      window.ipcRenderer.invoke = vi.fn().mockResolvedValue({
        success: true,
        isInstalled: false,
      });

      renderHook(() => useInstallationSetup());

      await vi.waitFor(() => {
        expect(mockAuthStore.setInitState).toHaveBeenCalledWith('carousel');
      });
    });

    it('should handle version update scenario', async () => {
      TestScenarios.versionUpdate(electronAPI);

      renderHook(() => useInstallationSetup());

      // Simulate version update detection and installation start
      electronAPI.simulateInstallationStart();

      await vi.waitFor(() => {
        expect(mockInstallationStore.startInstallation).toHaveBeenCalled();
      });
    });

    it('should handle venv removed scenario', async () => {
      TestScenarios.venvRemoved(electronAPI);
      electronAPI.mockState.isInstalling = true;

      renderHook(() => useInstallationSetup());

      await vi.waitFor(() => {
        expect(mockInstallationStore.startInstallation).toHaveBeenCalled();
      });
    });

    it('should handle installation in progress scenario', async () => {
      TestScenarios.installationInProgress(electronAPI);

      renderHook(() => useInstallationSetup());

      await vi.waitFor(() => {
        expect(mockInstallationStore.startInstallation).toHaveBeenCalled();
      });
    });

    it('should handle uvicorn startup with dependency installation', async () => {
      TestScenarios.uvicornDepsInstall(electronAPI);

      renderHook(() => useInstallationSetup());

      // Simulate uvicorn detecting and installing dependencies
      act(() => {
        electronAPI.simulateUvicornStartup();
      });

      await vi.waitFor(() => {
        expect(mockInstallationStore.startInstallation).toHaveBeenCalled();
      });

      // Should receive logs and completion
      await vi.waitFor(() => {
        expect(mockInstallationStore.addLog).toHaveBeenCalled();
        expect(mockInstallationStore.setSuccess).toHaveBeenCalled();
      });
    });
  });

  describe('Error Handling', () => {
    it('should handle tool installation check failure', async () => {
      const consoleErrorSpy = vi
        .spyOn(console, 'error')
        .mockImplementation(() => {});

      window.ipcRenderer.invoke = vi
        .fn()
        .mockRejectedValue(new Error('IPC failed'));

      renderHook(() => useInstallationSetup());

      await vi.waitFor(() => {
        expect(consoleErrorSpy).toHaveBeenCalledWith(
          '[useInstallationSetup] Tool installation check failed:',
          expect.any(Error)
        );
      });

      consoleErrorSpy.mockRestore();
    });

    it('should handle installation status check failure', async () => {
      // Mock console.error to suppress expected error logs
      const consoleErrorSpy = vi
        .spyOn(console, 'error')
        .mockImplementation(() => {});

      electronAPI.getInstallationStatus.mockRejectedValue(
        new Error('Status check failed')
      );

      renderHook(() => useInstallationSetup());

      // Should not crash, should handle the error gracefully
      await vi.waitFor(() => {
        expect(electronAPI.getInstallationStatus).toHaveBeenCalled();
      });

      // Wait for error to be logged
      await vi.waitFor(() => {
        expect(consoleErrorSpy).toHaveBeenCalled();
      });

      consoleErrorSpy.mockRestore();
    });
  });

  describe('Multiple Hook Instances', () => {
    it('should handle multiple hook instances without conflicts', () => {
      const { result: _hook1 } = renderHook(() => useInstallationSetup());
      const { result: _hook2 } = renderHook(() => useInstallationSetup());

      // Both hooks should register listeners
      expect(electronAPI.onInstallDependenciesStart).toHaveBeenCalledTimes(2);
      expect(electronAPI.onInstallDependenciesLog).toHaveBeenCalledTimes(2);
      expect(electronAPI.onInstallDependenciesComplete).toHaveBeenCalledTimes(
        2
      );
    });
  });

  describe('State Dependencies', () => {
    it('should react to initState changes', async () => {
      mockAuthStore.initState = 'carousel';

      const { rerender } = renderHook(() => useInstallationSetup());

      // Change initState to 'done'
      mockAuthStore.initState = 'done';
      rerender();

      // Should check tool installation again
      await vi.waitFor(() => {
        expect(window.ipcRenderer.invoke).toHaveBeenCalledWith(
          'check-tool-installed'
        );
      });
    });

    it('should not set carousel state if initState is not done', async () => {
      mockAuthStore.initState = 'loading';

      window.ipcRenderer.invoke = vi.fn().mockResolvedValue({
        success: true,
        isInstalled: false,
      });

      renderHook(() => useInstallationSetup());

      await vi.waitFor(() => {
        expect(window.ipcRenderer.invoke).toHaveBeenCalledWith(
          'check-tool-installed'
        );
      });

      // Should not call setInitState because initState is not 'done'
      expect(mockAuthStore.setInitState).not.toHaveBeenCalledWith('carousel');
    });
  });
});