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// 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. =========

/**
 * Integration Test: Case 1 - New Project
 *
 * Tests the complete flow of creating a new project and sending the first message.
 *
 * Flow:
 * 1. User creates a new project with initial message
 * 2. System automatically creates initial chatStore
 * 3. Task starts executing
 *
 * This is the most common user journey and serves as the foundation for all other cases.
 */

import { act, renderHook, waitFor } from '@testing-library/react';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { generateUniqueId } from '../../../src/lib';

// Import proxy mock to enable API mocking
import '../../mocks/proxy.mock';
// Also Mock authStore & sse
import '../../mocks/authStore.mock';
import '../../mocks/sse.mock';

// Import chat store to ensure it's available
import '../../../src/store/chatStore';

import { useProjectStore } from '../../../src/store/projectStore';
import { mockFetchEventSource } from '../../mocks/sse.mock';

// Mock electron IPC
(global as any).ipcRenderer = {
  invoke: vi.fn((channel) => {
    if (channel === 'get-system-language') return Promise.resolve('en');
    if (channel === 'get-browser-port') return Promise.resolve(9222);
    if (channel === 'get-env-path') return Promise.resolve('/path/to/env');
    if (channel === 'mcp-list') return Promise.resolve({});
    if (channel === 'get-file-list') return Promise.resolve([]);
    return Promise.resolve();
  }),
};

describe('Integration Test: Case 1 - New Project', () => {
  beforeEach(() => {
    vi.clearAllMocks();
    const { result } = renderHook(() => useProjectStore());
    //Reset projectStore
    result.current.getAllProjects().forEach((project) => {
      result.current.removeProject(project.id);
    });
  });

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

  it('should create project with initial chatStore and task', async () => {
    const { result, rerender } = renderHook(() => useProjectStore());

    await act(async () => {
      // Step 1: Create new project
      const projectId = result.current.createProject(
        'My First Project',
        'A test project'
      );

      // Force a re-render to ensure state is updated
      rerender();

      // Debug: Log the store state immediately after creation
      console.log('Created projectId:', projectId);

      // Try to get project before asserting
      const debugProject = result.current.getProjectById(projectId);
      console.log('Retrieved project:', debugProject);

      // Verify project created
      expect(projectId).toBeDefined();

      // First check: activeProjectId should be set
      expect(debugProject?.id).toBe(projectId);

      const project = result.current.getProjectById(projectId);
      console.log('Retrieved project again:', project);
      expect(project).toBeDefined();
      expect(project?.name).toBe('My First Project');
      expect(project?.description).toBe('A test project');
    });
  });

  it('should automatically create initial chatStore in new project', () => {
    const { result } = renderHook(() => useProjectStore());

    act(() => {
      const projectId = result.current.createProject('Test Project');

      // Step 2: Verify chatStore created automatically
      const chatStore = result.current.getActiveChatStore(projectId);
      expect(chatStore).toBeDefined();

      // Verify initial task exists
      const chatState = chatStore!.getState();
      expect(chatState.activeTaskId).toBeDefined();
      expect(chatState.tasks[chatState.activeTaskId!]).toBeDefined();
    });
  });

  it('should have correct initial task state', () => {
    const { result } = renderHook(() => useProjectStore());

    act(() => {
      const projectId = result.current.createProject('Test Project');
      const chatStore = result.current.getActiveChatStore(projectId)!;
      const chatState = chatStore.getState();
      const taskId = chatState.activeTaskId!;
      const task = chatState.tasks[taskId];

      // Verify task initial state
      expect(task.status).toBe('pending');
      expect(task.messages).toEqual([]);
      expect(task.tokens).toBe(0);
      expect(task.isPending).toBe(false);
      expect(task.hasMessages).toBe(false);
    });
  });

  it('should add user message to task', () => {
    const { result } = renderHook(() => useProjectStore());

    act(() => {
      const projectId = result.current.createProject('Test Project');
      const chatStore = result.current.getActiveChatStore(projectId)!;
      const taskId = chatStore.getState().activeTaskId!;

      // Step 3: User sends message
      const userMessage = {
        id: generateUniqueId(),
        role: 'user' as const,
        content: 'Create a todo app with React',
        attaches: [],
      };

      chatStore.getState().addMessages(taskId, userMessage);
      chatStore.getState().setHasMessages(taskId, true);

      // Verify message added
      const task = chatStore.getState().tasks[taskId];
      expect(task.messages).toHaveLength(1);
      expect(task.messages[0].content).toBe('Create a todo app with React');
      expect(task.hasMessages).toBe(true);
    });
  });

  it('should create historyId after starting task', async () => {
    const { result } = renderHook(() => useProjectStore());

    await act(async () => {
      const projectId = result.current.createProject('Test Project');
      const chatStore = result.current.getActiveChatStore(projectId)!;
      const taskId = chatStore.getState().activeTaskId!;

      // Add message
      chatStore.getState().addMessages(taskId, {
        id: generateUniqueId(),
        role: 'user',
        content: 'Test message',
      });

      // Mock SSE to immediately close (simulating startTask)
      mockFetchEventSource.mockImplementation((url: string, options: any) => {
        // Call onopen
        if (options.onopen) {
          options.onopen({ ok: true, status: 200 });
        }
        return Promise.resolve();
      });

      // Step 4: Start task
      await chatStore.getState().startTask(taskId);

      // Wait for historyId to be set
      await waitFor(
        () => {
          const historyId = result.current.getHistoryId(projectId);
          expect(historyId).toBeDefined();
          expect(historyId).toMatch(/^history-/);
        },
        { timeout: 2000 }
      );
    });
  });

  it('should handle complete user journey from project creation to task start', async () => {
    const { result } = renderHook(() => useProjectStore());

    await act(async () => {
      // Complete Flow Test

      // 1. Create project
      const projectId = result.current.createProject(
        'Complete Journey Test',
        'Testing full flow'
      );
      expect(projectId).toBeDefined();

      // 2. Get chatStore (automatically created)
      const chatStore = result.current.getActiveChatStore(projectId)!;
      expect(chatStore).toBeDefined();

      const initiatorTaskId = chatStore.getState().activeTaskId!;
      expect(initiatorTaskId).toBeDefined();

      // 3. Set user message
      const userMessage = 'Build a calculator app';

      // 4. Verify task ready to start
      const _initialTask = chatStore.getState().tasks[initiatorTaskId];

      // 5. Mock SSE stream with to_sub_tasks event
      mockFetchEventSource.mockImplementation((url: string, options: any) => {
        setTimeout(() => {
          console.log('Sending to_sub_tasks SSE Event');
          // Simulate to_sub_tasks event
          if (options.onmessage) {
            options.onmessage({
              data: JSON.stringify({
                step: 'to_sub_tasks',
                data: {
                  summary_task: 'Calculator App|Build a simple calculator',
                  sub_tasks: [
                    {
                      id: 'task-1',
                      content: 'Create UI components',
                      status: '',
                    },
                    {
                      id: 'task-2',
                      content: 'Implement calculator logic',
                      status: '',
                    },
                  ],
                },
              }),
            });
          }
        }, 200);
      });

      // 6. Start task
      // NOTE: startTask creates a NEW chatStore and switches to it, the old chatStore is no longer active
      await chatStore
        .getState()
        .startTask(
          initiatorTaskId,
          undefined,
          undefined,
          undefined,
          userMessage
        );

      // IMPORTANT: Get the NEW active chatStore after startTask creates it
      const newChatStore = result.current.getActiveChatStore();
      expect(newChatStore).toBeDefined();
      expect(newChatStore).not.toBe(chatStore); // Should be a different instance

      let taskId = newChatStore?.getState().activeTaskId!;
      const task = newChatStore?.getState().tasks[taskId];
      expect(taskId).toBeDefined();
      if (task) {
        expect(task.hasMessages).toBe(true);
        expect(task.messages[0].content).toBe('Build a calculator app');
        expect(task.status).toBe('pending');
      }

      // 7. Wait for task breakdown
      await waitFor(
        () => {
          const updatedTask = newChatStore?.getState().tasks[taskId];
          expect(updatedTask?.summaryTask).toBe(
            'Calculator App|Build a simple calculator'
          );
          //Bcz of newTaskInfo { id: '', content: '', status: '' } we have 3 items
          expect(updatedTask?.taskInfo).toHaveLength(3);
          expect(updatedTask?.taskRunning).toHaveLength(3);
        },
        { timeout: 2000 }
      );
    });
  });

  it('should not create new project if empty project exists (optimization)', () => {
    const { result } = renderHook(() => useProjectStore());

    act(() => {
      // Create first empty project
      const projectId1 = result.current.createProject('First Project');

      // Before adding any messages, create another project
      // Should reuse the empty project
      const projectId2 = result.current.createProject('Second Project');

      // Should reuse the same project ID
      expect(projectId2).toBe(projectId1);

      // Project should be updated with new name
      const project = result.current.getProjectById(projectId2);
      expect(project?.name).toBe('Second Project');
    });
  });

  it('should create new project if existing project has messages', () => {
    const { result } = renderHook(() => useProjectStore());

    act(() => {
      // Create first project
      const projectId1 = result.current.createProject('First Project');

      // Add a message (making it non-empty)
      const chatStore = result.current.getActiveChatStore(projectId1)!;
      const taskId = chatStore.getState().activeTaskId!;
      chatStore.getState().addMessages(taskId, {
        id: generateUniqueId(),
        role: 'user',
        content: 'Test message',
      });

      // Now create second project
      const projectId2 = result.current.createProject('Second Project');

      // Should create new project
      expect(projectId2).not.toBe(projectId1);
      expect(result.current.getAllProjects()).toHaveLength(2);
    });
  });

  describe('Edge Cases', () => {
    it('should handle project creation with minimal data', async () => {
      const { result } = renderHook(() => useProjectStore());

      await act(async () => {
        const projectId = result.current.createProject('Minimal Project');

        // Wait a tick to ensure all state updates are complete
        await new Promise((resolve) => setTimeout(resolve, 0));

        const project = result.current.getProjectById(projectId);
        expect(project?.name).toBe('Minimal Project');
        expect(project?.description).toBeUndefined();
      });
    });

    it('should handle empty message gracefully', async () => {
      const { result } = renderHook(() => useProjectStore());

      await act(async () => {
        const projectId = result.current.createProject('Test Project');

        // Wait a tick for project creation to complete
        await new Promise((resolve) => setTimeout(resolve, 0));

        const chatStore = result.current.getActiveChatStore(projectId)!;
        const taskId = chatStore.getState().activeTaskId!;

        // Add empty message
        chatStore.getState().addMessages(taskId, {
          id: generateUniqueId(),
          role: 'user',
          content: '',
        });

        // Wait for message update to complete
        await new Promise((resolve) => setTimeout(resolve, 0));

        const task = chatStore.getState().tasks[taskId];
        expect(task.messages).toHaveLength(1);
        expect(task.messages[0].content).toBe('');
      });
    });

    it('should handle rapid project creation', async () => {
      const { result } = renderHook(() => useProjectStore());

      await act(async () => {
        const projectIds = [];
        for (let i = 0; i < 5; i++) {
          projectIds.push(result.current.createProject(`Project ${i}`));
          // Add small delay between each creation to ensure proper state updates
          await new Promise((resolve) => setTimeout(resolve, 0));
        }

        // Only first should be created, rest reuse until messages added
        expect(new Set(projectIds).size).toBeLessThanOrEqual(1);
      });
    });
  });
});