// ========= 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 {
  useInstallationStore,
  type InstallationState,
} from '../../../src/store/installationStore';
import {
  setupElectronMocks,
  TestScenarios,
  type MockedElectronAPI,
} from '../../mocks/electronMocks';

// Mock the authStore import since it's imported dynamically
vi.mock('../../../src/store/authStore', () => ({
  useAuthStore: {
    getState: () => ({
      setInitState: vi.fn(),
    }),
  },
}));

describe('Installation Store', () => {
  let electronAPI: MockedElectronAPI;
  let mockSetInitState: ReturnType<typeof vi.fn>;

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

    // Mock the authStore
    const { useAuthStore } = await import('../../../src/store/authStore');
    mockSetInitState = vi.fn();
    useAuthStore.getState = vi.fn().mockReturnValue({
      setInitState: mockSetInitState,
    });

    // Reset the store to initial state
    useInstallationStore.getState().reset();
  });

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

  describe('Initial State', () => {
    it('should have correct initial state', () => {
      const { result } = renderHook(() => useInstallationStore());

      expect(result.current.state).toBe('idle');
      expect(result.current.progress).toBe(20);
      expect(result.current.logs).toEqual([]);
      expect(result.current.error).toBeUndefined();
      expect(result.current.isVisible).toBe(false);
    });
  });

  describe('State Transitions', () => {
    it('should transition from idle to installing when startInstallation is called', () => {
      const { result } = renderHook(() => useInstallationStore());

      act(() => {
        result.current.startInstallation();
      });

      expect(result.current.state).toBe('installing');
      expect(result.current.progress).toBe(20);
      expect(result.current.logs).toEqual([]);
      expect(result.current.error).toBeUndefined();
      expect(result.current.isVisible).toBe(true);
    });

    it('should transition to completed when setSuccess is called', () => {
      const { result } = renderHook(() => useInstallationStore());

      act(() => {
        result.current.startInstallation();
      });

      act(() => {
        result.current.setSuccess();
      });

      expect(result.current.state).toBe('completed');
      expect(result.current.progress).toBe(100);
    });

    it('should transition to error when setError is called', () => {
      const { result } = renderHook(() => useInstallationStore());
      const errorMessage = 'Installation failed';

      act(() => {
        result.current.startInstallation();
      });

      act(() => {
        result.current.setError(errorMessage);
      });

      expect(result.current.state).toBe('error');
      expect(result.current.error).toBe(errorMessage);
      expect(result.current.logs).toHaveLength(1);
      expect(result.current.logs[0].type).toBe('stderr');
      expect(result.current.logs[0].data).toBe(errorMessage);
    });

    it('should reset to installing state when retryInstallation is called', () => {
      const { result } = renderHook(() => useInstallationStore());

      // First, set error state
      act(() => {
        result.current.startInstallation();
      });

      act(() => {
        result.current.setError('Some error');
      });

      expect(result.current.state).toBe('error');

      // Then retry
      act(() => {
        result.current.retryInstallation();
      });

      expect(result.current.state).toBe('installing');
      expect(result.current.logs).toEqual([]);
      expect(result.current.error).toBeUndefined();
      expect(result.current.isVisible).toBe(true);
    });
  });

  describe('Log Management', () => {
    it('should add logs and update progress', () => {
      const { result } = renderHook(() => useInstallationStore());

      act(() => {
        result.current.startInstallation();
      });

      const initialProgress = result.current.progress;

      act(() => {
        result.current.addLog({
          type: 'stdout',
          data: 'Installing package...',
          timestamp: new Date(),
        });
      });

      expect(result.current.logs).toHaveLength(1);
      expect(result.current.logs[0].type).toBe('stdout');
      expect(result.current.logs[0].data).toBe('Installing package...');
      expect(result.current.progress).toBe(initialProgress + 5);
    });

    it('should not exceed 90% progress when adding logs', () => {
      const { result } = renderHook(() => useInstallationStore());

      act(() => {
        result.current.startInstallation();
      });

      // Add many logs to test progress cap
      act(() => {
        for (let i = 0; i < 20; i++) {
          result.current.addLog({
            type: 'stdout',
            data: `Log entry ${i}`,
            timestamp: new Date(),
          });
        }
      });

      expect(result.current.progress).toBe(90);
      expect(result.current.logs).toHaveLength(20);
    });
  });

  describe('Installation Flow Integration', () => {
    it('should handle successful installation flow', async () => {
      TestScenarios.versionUpdate(electronAPI);

      const { result } = renderHook(() => useInstallationStore());

      // Start installation
      await act(async () => {
        await result.current.performInstallation();
      });

      // Wait for the mocked installation to complete
      await vi.waitFor(
        () => {
          expect(result.current.state).toBe('completed');
        },
        { timeout: 1000 }
      );

      expect(electronAPI.checkAndInstallDepsOnUpdate).toHaveBeenCalled();
      expect(mockSetInitState).toHaveBeenCalledWith('done');
    });

    it('should handle installation failure', async () => {
      TestScenarios.installationError(electronAPI);

      const { result } = renderHook(() => useInstallationStore());

      await act(async () => {
        await result.current.performInstallation();
      });

      // Wait for the mocked installation to fail
      await vi.waitFor(
        () => {
          expect(result.current.state).toBe('error');
        },
        { timeout: 1000 }
      );

      expect(result.current.error).toBe('Installation failed');
    });

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

      const { result } = renderHook(() => useInstallationStore());

      await act(async () => {
        await result.current.performInstallation();
      });

      await vi.waitFor(
        () => {
          expect(result.current.state).toBe('completed');
        },
        { timeout: 1000 }
      );

      expect(electronAPI.checkAndInstallDepsOnUpdate).toHaveBeenCalled();
    });
  });

  describe('Log Export', () => {
    it('should export logs successfully', async () => {
      const { result } = renderHook(() => useInstallationStore());

      // Mock window.location.href
      const originalLocation = window.location;
      Object.defineProperty(window, 'location', {
        value: { href: '' },
        writable: true,
      });

      // Mock alert
      const alertSpy = vi.spyOn(window, 'alert').mockImplementation(() => {});

      await act(async () => {
        await result.current.exportLog();
      });

      expect(electronAPI.exportLog).toHaveBeenCalled();
      expect(alertSpy).toHaveBeenCalledWith('Log saved: /mock/path/to/log.txt');
      expect(window.location.href).toBe(
        'https://github.com/eigent-ai/eigent/issues/new/choose'
      );

      // Restore
      Object.defineProperty(window, 'location', {
        value: originalLocation,
        writable: true,
      });
      alertSpy.mockRestore();
    });

    it('should handle export failure', async () => {
      electronAPI.exportLog.mockResolvedValue({
        success: false,
        error: 'Export failed',
      });

      const { result } = renderHook(() => useInstallationStore());
      const alertSpy = vi.spyOn(window, 'alert').mockImplementation(() => {});

      await act(async () => {
        await result.current.exportLog();
      });

      expect(alertSpy).toHaveBeenCalledWith('Export cancelled: Export failed');
      alertSpy.mockRestore();
    });
  });

  describe('Computed Selectors', () => {
    it('useLatestLog should return the most recent log', () => {
      const { result: storeResult } = renderHook(() => useInstallationStore());
      const { result: latestLogResult } = renderHook(() =>
        useInstallationStore((state: any) => state.logs[state.logs.length - 1])
      );

      expect(latestLogResult.current).toBeUndefined();

      act(() => {
        storeResult.current.startInstallation();
        storeResult.current.addLog({
          type: 'stdout',
          data: 'First log',
          timestamp: new Date(),
        });
        storeResult.current.addLog({
          type: 'stderr',
          data: 'Latest log',
          timestamp: new Date(),
        });
      });

      expect(latestLogResult.current.data).toBe('Latest log');
      expect(latestLogResult.current.type).toBe('stderr');
    });

    it('useInstallationStatus should return correct status', () => {
      const { result: storeResult } = renderHook(() => useInstallationStore());
      const { result: statusResult } = renderHook(() => {
        const state = useInstallationStore((state: any) => state.state);
        const isVisible = useInstallationStore((state: any) => state.isVisible);

        return {
          isInstalling: state === 'installing',
          installationState: state,
          shouldShowInstallScreen: isVisible && state !== 'completed',
          isInstallationComplete: state === 'completed',
          canRetry: state === 'error',
        };
      });

      // Initial state
      expect(statusResult.current.isInstalling).toBe(false);
      expect(statusResult.current.installationState).toBe('idle');
      expect(statusResult.current.shouldShowInstallScreen).toBe(false);
      expect(statusResult.current.isInstallationComplete).toBe(false);
      expect(statusResult.current.canRetry).toBe(false);

      // Installing state
      act(() => {
        storeResult.current.startInstallation();
      });

      expect(statusResult.current.isInstalling).toBe(true);
      expect(statusResult.current.shouldShowInstallScreen).toBe(true);
      expect(statusResult.current.canRetry).toBe(false);

      // Error state
      act(() => {
        storeResult.current.setError('Some error');
      });

      expect(statusResult.current.isInstalling).toBe(false);
      expect(statusResult.current.canRetry).toBe(true);

      // Completed state
      act(() => {
        storeResult.current.setSuccess();
      });

      expect(statusResult.current.isInstallationComplete).toBe(true);
      expect(statusResult.current.shouldShowInstallScreen).toBe(false);
    });
  });

  describe('Edge Cases', () => {
    it('should handle multiple rapid state changes', () => {
      const { result } = renderHook(() => useInstallationStore());

      act(() => {
        result.current.startInstallation();
        result.current.setError('Error 1');
        result.current.retryInstallation();
        result.current.setSuccess();
      });

      expect(result.current.state).toBe('completed');
      expect(result.current.progress).toBe(100);
    });

    it('should handle visibility changes correctly', () => {
      const { result } = renderHook(() => useInstallationStore());

      expect(result.current.isVisible).toBe(false);

      act(() => {
        result.current.setVisible(true);
      });

      expect(result.current.isVisible).toBe(true);

      act(() => {
        result.current.completeSetup();
      });

      expect(result.current.state).toBe('completed');
      expect(result.current.isVisible).toBe(false);
    });

    it('should handle manual progress updates', () => {
      const { result } = renderHook(() => useInstallationStore());

      act(() => {
        result.current.updateProgress(75);
      });

      expect(result.current.progress).toBe(75);
    });
  });

  describe('Installation State Sequence', () => {
    it('should follow correct state sequence for normal installation', async () => {
      const { result } = renderHook(() => useInstallationStore());
      const states: InstallationState[] = [];

      // Subscribe to state changes
      useInstallationStore.subscribe((state: any) => {
        states.push(state.state);
      });

      await act(async () => {
        await result.current.performInstallation();
      });

      await vi.waitFor(
        () => {
          expect(result.current.state).toBe('completed');
        },
        { timeout: 1000 }
      );

      // Should have progressed through: idle -> installing -> completed
      expect(states).toContain('installing');
      expect(states).toContain('completed');
    });
  });
});