import { ChatView } from '../src/chat-view';
import { PluginSettings, OllamaMessage, ChatMessage, OllamaTool, ToolCall } from '../src/types';
import { ErrorHandler } from '../src/error-handler';
import { ChatHistoryManager } from '../src/chat-history';

// Mock Obsidian types
interface MockVault {
  getMarkdownFiles: () => any[];
  read: () => Promise<string>;
  cachedRead: () => Promise<string>;
  getAbstractFileByPath: () => any;
  create: () => Promise<any>;
  modify: () => Promise<void>;
  rename: () => Promise<void>;
  delete: () => Promise<void>;
}
interface MockWorkspace {
  getLeaf: () => any;
  revealLeaf: () => void;
}
interface MockApp {
  vault: MockVault;
  workspace: MockWorkspace;
}

// Mock Obsidian module - ItemView must set this.app from the leaf
jest.mock('obsidian', () => ({
  ItemView: jest.fn().mockImplementation(function (this: any, leaf: any) {
    this.app = leaf.app;
  }),
  WorkspaceLeaf: jest.fn(),
  Notice: jest.fn(),
}));

const mockSettings: PluginSettings = {
  ollamaUrl: 'http://localhost:11434',
  chatModel: 'llama3',
  agentModel: 'llama3',
  model: 'llama3',
  vaultSearchLimit: 3,
  maxMessageHistory: 50,
  maxContextLength: 8000,
  lastIndexTime: 0,
  agentMode: 'ask',
  cacheConfig: {
    enabled: false,
    similarityThreshold: 0.9,
    collectionName: 'test-cache',
    embeddingModel: 'nomic-embed-text',
    chromaURL: 'http://localhost:8000',
  },
  vaultIndexConfig: {
    enabled: false,
    similarityThreshold: 0.75,
    collectionName: 'test-vault-index',
    embeddingModel: 'nomic-embed-text',
    chromaURL: 'http://localhost:8000',
  },
  autoTagConfig: {
    enabled: false,
    maxTagsPerNote: 5,
    minNoteLength: 50,
    maxNoteLength: 8000,
    tagPromptTemplate: 'Tags: {{content}}',
    dryRun: false,
    targetFolder: '',
    normalizeTags: true,
  },
  autoLinkConfig: {
    enabled: false,
    maxLinksPerNote: 3,
    similarityThreshold: 0.6,
    targetFolder: '',
    dryRun: false,
  },
  structuredMemoryConfig: {
    enabled: true,
    maxSummaries: 10,
    maxPreferences: 20,
    maxFacts: 50,
  },
  toolTelemetryConfig: {
    enabled: true,
    maxEntries: 100,
  },
};

describe('ChatView', () => {
  let view: ChatView;
  let mockLeaf: any;
  let mockApp: MockApp;

  beforeEach(() => {
    jest.clearAllMocks();
    mockApp = {
      vault: {
        getMarkdownFiles: jest.fn().mockReturnValue([]),
        read: jest.fn().mockResolvedValue(''),
        cachedRead: jest.fn().mockResolvedValue(''),
        getAbstractFileByPath: jest.fn().mockReturnValue(null),
        create: jest.fn().mockResolvedValue(null),
        modify: jest.fn().mockResolvedValue(undefined),
        rename: jest.fn().mockResolvedValue(undefined),
        delete: jest.fn().mockResolvedValue(undefined),
      },
      workspace: {
        getLeaf: jest.fn(),
        revealLeaf: jest.fn(),
      },
    };

    mockLeaf = {
      view: null,
      setViewState: jest.fn(),
      app: mockApp,
    };

    view = new ChatView(
      mockLeaf as unknown as any,
      mockSettings,
      undefined,
      undefined,
      undefined,
      new ChatHistoryManager()
    );
    // Obsidian's contentEl has a createEl helper that standard DOM lacks
    // Unlike standard DOM, Obsidian elements can create nested elements with createEl
    const contentDiv = document.createElement('div') as any;

    // Create a factory function that captures the parent element
    const createElementWithCreateEl = function (parent: any) {
      return function (tag: string, options?: { cls?: string }) {
        const el = document.createElement(tag);
        if (options?.cls) {
          el.classList.add(...options.cls.split(' '));
        }
        parent.appendChild(el);
        // Add createEl to the new element so it can create nested elements
        (el as any).createEl = createElementWithCreateEl(el);
        return el;
      };
    };

    contentDiv.createEl = createElementWithCreateEl(contentDiv);
    view.contentEl = contentDiv;

    // Mock NoteContextBuilder to avoid needing full Obsidian API mocks
    jest.spyOn(view['noteContextBuilder'], 'buildContext').mockResolvedValue({
      explicitMentions: [],
      openNote: undefined,
      selectedText: undefined,
      backlinks: [],
      outlinks: [],
      relatedNotes: [],
      searchResults: [],
    });
    jest.spyOn(view['noteContextBuilder'], 'formatContext').mockReturnValue('');
  });

  describe('getViewType', () => {
    it('should return the correct view type', () => {
      expect(view.getViewType()).toBe('ollama-chat-view');
    });
  });

  describe('getDisplayText', () => {
    it('should return the correct display text', () => {
      expect(view.getDisplayText()).toBe('Ollama Chat');
    });
  });

  describe('getIcon', () => {
    it('should return the bot icon', () => {
      expect(view.getIcon()).toBe('bot');
    });
  });

  describe('onOpen', () => {
    it('should call render and setup event listeners', async () => {
      const renderSpy = jest.spyOn(view, 'render');
      const setupSpy = jest.spyOn(view, 'setupEventListeners' as any);
      await view.onOpen();
      expect(renderSpy).toHaveBeenCalled();
      expect(setupSpy).toHaveBeenCalled();
    });
  });

  describe('onClose', () => {
    it('should clean up resources and remove event listeners', async () => {
      view['lastMessageEl'] = document.createElement('div');
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      const removeSpy = jest.spyOn(view, 'removeEventListeners' as any);
      await view.onClose();
      expect(view['lastMessageEl']).toBeNull();
      expect(view['sendButton']).toBeNull();
      expect(view['inputEl']).toBeNull();
      expect(removeSpy).toHaveBeenCalled();
    });
  });

  describe('render', () => {
    it('should render the chat interface', async () => {
      await view.render();
      expect(view.contentEl.querySelector('.ollama-chat-container')).not.toBeNull();
      expect(view.contentEl.querySelector('.ollama-input-container')).not.toBeNull();
    });

    it('should not duplicate elements on re-render', async () => {
      // First render
      await view.render();
      const firstRenderCount = view.contentEl.querySelectorAll('.ollama-message').length;

      // Second render with no changes
      await view.render();
      const secondRenderCount = view.contentEl.querySelectorAll('.ollama-message').length;

      expect(secondRenderCount).toBe(firstRenderCount);
    });

    it('should only render non-streaming messages', async () => {
      view['messages'] = [
        { id: '1', role: 'user', content: 'test', timestamp: Date.now() },
        {
          id: '2',
          role: 'assistant',
          content: 'response',
          timestamp: Date.now(),
          isStreaming: true,
        },
      ];
      await view.render();
      const messages = view.contentEl.querySelectorAll('.ollama-message');
      expect(messages.length).toBe(1);
    });
  });

  describe('handleUserInput', () => {
    it('should handle user input and call ollamaClient', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield { role: 'assistant', content: 'test' };
        })()
      );
      await (view as any).handleUserInput('test');
      expect(chatSpy).toHaveBeenCalled();
      // Verify that messages were added to conversation history
      expect((view as any).messages.length).toBeGreaterThan(0);
    });

    it('should handle empty user input gracefully', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = '   ';
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat');
      await (view as any).handleUserInput('   ');
      expect(chatSpy).not.toHaveBeenCalled();
    });

    it('should handle streaming responses and update UI', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield { role: 'assistant', content: 'First ' };
          yield { role: 'assistant', content: 'chunk ' };
          yield { role: 'assistant', content: 'of response' };
        })()
      );
      await (view as any).handleUserInput('test');
      expect(chatSpy).toHaveBeenCalled();
      // Should have processed all chunks
      const messages = (view as any).messages;
      const lastMessage = messages[messages.length - 1];
      expect(lastMessage.isStreaming).toBe(false);
    });

    it('should handle streaming re-attach when existing streaming element is found', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      (view as any).lastMessageEl = document.createElement('div');
      (view as any).lastMessageEl.setAttribute('data-msg-id', 'streaming-123');

      // Mock querySelector to return existing element
      const container = document.createElement('div');
      const existingEl = document.createElement('div');
      existingEl.setAttribute('data-msg-id', 'streaming-123');
      container.appendChild(existingEl);

      // Mock the contentEl to return our container
      const originalContentEl = (view as any).contentEl;
      (view as any).contentEl = container;

      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield { role: 'assistant', content: 'response' };
        })()
      );

      await (view as any).handleUserInput('test');

      expect(chatSpy).toHaveBeenCalled();
      expect(container.contains((view as any).lastMessageEl)).toBe(true);

      // Restore original contentEl
      (view as any).contentEl = originalContentEl;
    });

    it('should append streaming element to container when no existing element found', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';

      // Mock querySelector to return null (no existing element)
      const container = document.createElement('div');
      const originalQuerySelector = container.querySelector;
      container.querySelector = jest.fn().mockReturnValue(null);

      // Mock the contentEl to return our container
      const originalContentEl = (view as any).contentEl;
      (view as any).contentEl = container;

      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield { role: 'assistant', content: 'response' };
        })()
      );

      await (view as any).handleUserInput('test');

      expect(chatSpy).toHaveBeenCalled();
      expect(container.childElementCount).toBeGreaterThan(0);

      // Restore original contentEl and querySelector
      (view as any).contentEl = originalContentEl;
      container.querySelector = originalQuerySelector;
    });

    it('should limit conversation history to maxMessageHistory', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';

      // Mock a stream that returns quickly
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield { role: 'assistant', content: 'response' };
        })()
      );

      // Add enough messages to exceed maxMessageHistory
      for (let i = 0; i < 60; i++) {
        (view as any).messages.push({
          id: `msg-${i}`,
          role: 'user',
          content: `message ${i}`,
          timestamp: Date.now(),
        });
      }

      await (view as any).handleUserInput('test');

      // Should be limited to maxMessageHistory
      expect((view as any).messages.length).toBeLessThanOrEqual(50);
    });

    it('should call noteContextBuilder with user input', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'search query';

      const searchSpy = jest.spyOn(view['noteContextBuilder'], 'buildContext').mockResolvedValue({
        explicitMentions: [],
        openNote: undefined,
        selectedText: undefined,
        backlinks: [],
        outlinks: [],
        relatedNotes: [],
        searchResults: [],
      });
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield { role: 'assistant', content: 'response' };
        })()
      );

      await (view as any).handleUserInput('search query');

      expect(searchSpy).toHaveBeenCalledWith('search query', 3, expect.any(Object)); // Should use DEFAULT_VAULT_SEARCH_LIMIT
      expect(chatSpy).toHaveBeenCalled();
    });

    it('should auto-run read tools when organize mode returns a non-action response', async () => {
      view.setAgentMode('organize');
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value =
        'please implement the suggested structure by creating folders and moving notes';

      const streamSpy = jest.spyOn(view['ollamaClient'], 'streamChat');
      streamSpy
        .mockReturnValueOnce(
          (async function* () {
            yield {
              role: 'assistant',
              content:
                'Let me look at the current note and previous conversation to understand what structure was suggested.',
            };
          })()
        )
        .mockReturnValueOnce(
          (async function* () {
            yield {
              role: 'assistant',
              content:
                'Let me read the current Prompts note and look at the Vault Index for more context.',
            };
          })()
        );

      const handleToolSpy = jest
        .spyOn(view['toolExecutor'], 'handleToolCall')
        .mockResolvedValue({
          success: true,
          message: 'Found vault context',
          data: [{ path: 'Prompts.md', title: 'Prompts' }],
        });
      jest.spyOn(view['ollamaClient'], 'chat').mockResolvedValue({
        role: 'assistant',
        content: 'I found vault context and can now suggest the next organization step.',
      });

      await (view as any).handleUserInput(
        'please implement the suggested structure by creating folders and moving notes'
      );

      expect(handleToolSpy).toHaveBeenCalled();
      expect(
        handleToolSpy.mock.calls.some(
          ([toolCall]) => toolCall.function.name === 'get_vault_stats'
        )
      ).toBe(true);
      expect(
        handleToolSpy.mock.calls.some(
          ([toolCall]) => toolCall.function.name === 'list_vault_tags'
        )
      ).toBe(true);

      const messages = (view as any).messages;
      const lastMessage = messages[messages.length - 1];
      expect(lastMessage.content).toBe(
        'I found vault context and can now suggest the next organization step.'
      );
    });

    it('should handle errors during user input gracefully', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';

      // Mock a stream that throws an error
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          throw new Error('Network error');
        })()
      );

      const consoleSpy = jest.spyOn(console, 'error').mockImplementation(() => {});

      await (view as any).handleUserInput('test');

      expect(chatSpy).toHaveBeenCalled();
      expect(consoleSpy).toHaveBeenCalledWith(
        'Ollama Plugin Error [ChatView.handleUserInput]: Network error'
      );
    });

    it('should handle empty user input gracefully', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = '   ';
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat');
      await (view as any).handleUserInput('   ');
      expect(chatSpy).not.toHaveBeenCalled();
    });

    it('should handle streaming responses and update UI', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield { role: 'assistant', content: 'First ' };
          yield { role: 'assistant', content: 'chunk ' };
          yield { role: 'assistant', content: 'of response' };
        })()
      );
      await (view as any).handleUserInput('test');
      expect(chatSpy).toHaveBeenCalled();
      // Should have processed all chunks
      const messages = (view as any).messages;
      const lastMessage = messages[messages.length - 1];
      expect(lastMessage.isStreaming).toBe(false);
    });

    it('should show preview for write tool calls and defer follow-up', async () => {
      view.setAgentMode('edit');
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield {
            role: 'assistant',
            content: 'test',
            tool_calls: [
              {
                id: 'tool_1',
                type: 'function',
                function: {
                  name: 'create_file',
                  arguments: '{"path":"test/file.md","content":"Test content"}',
                },
              },
            ],
          };
        })()
      );
      const followUpSpy = jest
        .spyOn(view['ollamaClient'], 'chat')
        .mockResolvedValue({ role: 'assistant', content: ' follow-up' });

      // Mock preview builder
      jest.spyOn(view['actionPreviewBuilder'], 'buildPreview').mockResolvedValue({
        id: 'tool_1',
        toolCall: {
          id: 'tool_1',
          type: 'function',
          function: {
            name: 'create_file',
            arguments: '{"path":"test/file.md","content":"Test content"}',
          },
        } as unknown as any,
        operation: 'create',
        path: 'test/file.md',
        description: 'Create note: test/file.md',
        preview: { after: 'Test content' },
        status: 'pending',
      });

      await (view as any).handleUserInput('test');
      expect(chatSpy).toHaveBeenCalled();
      // With write tools, follow-up should be deferred until apply
      expect(followUpSpy).not.toHaveBeenCalled();
      expect((view as any).pendingActions.length).toBe(1);
      expect((view as any).messages.length).toBeGreaterThan(1);
    });

    it('should apply pending actions and trigger follow-up', async () => {
      view.setAgentMode('edit');
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      const assistantMessageId = 'test-assistant-id';
      view['messages'] = [
        {
          id: 'user-id',
          role: 'user',
          content: 'test',
          timestamp: Date.now(),
        },
        {
          id: assistantMessageId,
          role: 'assistant',
          content: 'test',
          timestamp: Date.now(),
          isStreaming: false,
        },
      ];

      view['pendingActions'] = [
        {
          id: 'tool_1',
          toolCall: {
            id: 'tool_1',
            type: 'function',
            function: {
              name: 'create_file',
              arguments: '{"path":"test/file.md","content":"Test content"}',
            },
          } as unknown as any,
          operation: 'create',
          path: 'test/file.md',
          description: 'Create note: test/file.md',
          status: 'pending',
        },
      ];
      view['pendingReadResults'] = [];
      view['pendingFollowUpContext'] = {
        messages: [],
        tools: [],
        assistantMessageId,
      };

      const followUpSpy = jest
        .spyOn(view['ollamaClient'], 'chat')
        .mockResolvedValue({ role: 'assistant', content: ' follow-up' });

      const toolExecutor = view['toolExecutor'];
      jest.spyOn(toolExecutor, 'handleToolCall').mockResolvedValue({
        success: true,
        message: 'Note created successfully',
      });

      await view.applyPendingActions();
      expect(followUpSpy).toHaveBeenCalled();
      expect((view as any).pendingActions.length).toBe(0);
    });

    it('should cancel pending actions', async () => {
      view.setAgentMode('edit');
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      const assistantMessageId = 'test-assistant-id';
      view['messages'] = [
        {
          id: assistantMessageId,
          role: 'assistant',
          content: 'Proposed actions...',
          timestamp: Date.now(),
          isStreaming: false,
        },
      ];
      view['pendingActions'] = [
        {
          id: 'tool_1',
          toolCall: {
            id: 'tool_1',
            type: 'function',
            function: {
              name: 'create_file',
              arguments: '{"path":"test.md","content":"test"}',
            },
          } as unknown as any,
          operation: 'create',
          path: 'test.md',
          description: 'Create note: test.md',
          status: 'pending',
        },
      ];
      view['pendingFollowUpContext'] = {
        messages: [],
        tools: [],
        assistantMessageId,
      };

      view.cancelPendingActions();
      const msg = (view as any).messages.find((m: any) => m.id === assistantMessageId);
      expect(msg.content).toContain('cancelled');
      expect((view as any).pendingActions.length).toBe(0);
    });

    it('should handle tool call errors gracefully and continue with partial results', async () => {
      view.setAgentMode('edit');
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield {
            role: 'assistant',
            content: 'Response with tools',
            tool_calls: [
              {
                id: 'call_1',
                type: 'function',
                function: { name: 'create_file', arguments: '{"path":"test.md","content":"test"}' },
              },
              {
                id: 'call_2',
                type: 'function',
                function: { name: 'nonexistent_tool', arguments: '{}' },
              },
            ],
          };
        })()
      );
      const followUpSpy = jest.spyOn(view['ollamaClient'], 'chat').mockResolvedValue({
        role: 'assistant',
        content: 'Follow-up response',
        tool_calls: [],
      });

      // Mock preview builder for write tool
      jest.spyOn(view['actionPreviewBuilder'], 'buildPreview').mockResolvedValue({
        id: 'call_1',
        toolCall: {
          id: 'call_1',
          type: 'function',
          function: {
            name: 'create_file',
            arguments: '{"path":"test.md","content":"test"}',
          },
        } as unknown as any,
        operation: 'create',
        path: 'test.md',
        description: 'Create note: test.md',
        preview: { after: 'test' },
        status: 'pending',
      });

      // Mock tool executor — read tool fails
      const toolExecutor = view['toolExecutor'];
      jest.spyOn(toolExecutor, 'handleToolCall').mockImplementation(async (call) => {
        if (call.function.name === 'nonexistent_tool') {
          throw new Error('Tool not found');
        }
        return { success: true, message: 'Done' };
      });

      const consoleSpy = jest.spyOn(console, 'error').mockImplementation(() => {});
      const errorHandlerSpy = jest.spyOn(ErrorHandler, 'handleError').mockImplementation(() => {});

      await (view as any).handleUserInput('test');

      expect(chatSpy).toHaveBeenCalled();
      // Write tools trigger preview, not immediate follow-up
      expect(followUpSpy).not.toHaveBeenCalled();
      expect(errorHandlerSpy).toHaveBeenCalledWith(expect.any(Error), 'ChatView.handleUserInput');
      expect((view as any).messages.length).toBeGreaterThan(1);
      consoleSpy.mockRestore();
      errorHandlerSpy.mockRestore();
    });

    it('should continue processing even when all tool calls fail', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield {
            role: 'assistant',
            content: 'Response with tools',
            tool_calls: [
              {
                id: 'call_1',
                type: 'function',
                function: { name: 'nonexistent_tool_1', arguments: '{}' },
              },
              {
                id: 'call_2',
                type: 'function',
                function: { name: 'nonexistent_tool_2', arguments: '{}' },
              },
            ],
          };
        })()
      );
      const followUpSpy = jest.spyOn(view['ollamaClient'], 'chat').mockResolvedValue({
        role: 'assistant',
        content: 'Final response despite tool failures',
        tool_calls: [],
      });

      // Mock tool executor to fail for all calls
      const toolExecutor = view['toolExecutor'];
      jest.spyOn(toolExecutor, 'handleToolCall').mockImplementation(async () => {
        throw new Error('Tool not found');
      });

      const errorHandlerSpy = jest.spyOn(ErrorHandler, 'handleError').mockImplementation(() => {});

      await (view as any).handleUserInput('test');

      expect(chatSpy).toHaveBeenCalled();
      expect(followUpSpy).not.toHaveBeenCalled(); // Should skip follow-up when no tool results
      expect(errorHandlerSpy).toHaveBeenCalledTimes(2); // Should be called for each failed tool call
      expect((view as any).messages.length).toBeGreaterThan(1);
      errorHandlerSpy.mockRestore();
    });

    it('should skip follow-up when tool calls result in no successful results', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield {
            role: 'assistant',
            content: 'Response with tools',
            tool_calls: [
              {
                id: 'call_1',
                type: 'function',
                function: { name: 'nonexistent_tool', arguments: '{}' },
              },
            ],
          };
        })()
      );
      const followUpSpy = jest.spyOn(view['ollamaClient'], 'chat').mockResolvedValue({
        role: 'assistant',
        content: 'Final response',
        tool_calls: [],
      });

      // Mock tool executor to fail for the call
      const toolExecutor = view['toolExecutor'];
      jest.spyOn(toolExecutor, 'handleToolCall').mockImplementation(async () => {
        throw new Error('Tool not found');
      });

      const errorHandlerSpy = jest.spyOn(ErrorHandler, 'handleError').mockImplementation(() => {});

      await (view as any).handleUserInput('test');

      expect(chatSpy).toHaveBeenCalled();
      expect(followUpSpy).not.toHaveBeenCalled(); // Should skip follow-up when no tool results
      expect(errorHandlerSpy).toHaveBeenCalledTimes(1); // Should be called for each failed tool call
      errorHandlerSpy.mockRestore();
    });

    it('should handle /workflow command', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = '/workflow find notes and summarize';

      const workflowSpy = jest
        .spyOn(view['workflowEngine'], 'executeWorkflowFromQuery')
        .mockResolvedValue({
          workflowId: 'wf-1',
          workflowName: 'Test Workflow',
          success: true,
          stepResults: [
            {
              stepId: 's1',
              stepName: 'Search',
              success: true,
              data: ['note1'],
              timestamp: Date.now(),
            },
          ],
          finalOutput: 'Summary result',
        });

      await (view as any).handleUserInput('/workflow find notes and summarize');

      expect(workflowSpy).toHaveBeenCalledWith('find notes and summarize', expect.any(Array));
      const assistantMsg = (view as any).messages.find((m: any) => m.role === 'assistant');
      expect(assistantMsg.content).toContain('Test Workflow');
      expect(assistantMsg.content).toContain('Summary result');
    });

    it('should limit conversation history to maxMessageHistory', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';

      // Mock a stream that returns quickly
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield { role: 'assistant', content: 'response' };
        })()
      );

      // Add enough messages to exceed maxMessageHistory
      for (let i = 0; i < 60; i++) {
        (view as any).messages.push({
          id: `msg-${i}`,
          role: 'user',
          content: `message ${i}`,
          timestamp: Date.now(),
        });
      }

      await (view as any).handleUserInput('test');

      // Should be limited to maxMessageHistory
      expect((view as any).messages.length).toBeLessThanOrEqual(50);
    });

    it('should call noteContextBuilder with user input', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'search query';

      const searchSpy = jest.spyOn(view['noteContextBuilder'], 'buildContext').mockResolvedValue({
        explicitMentions: [],
        openNote: undefined,
        selectedText: undefined,
        backlinks: [],
        outlinks: [],
        relatedNotes: [],
        searchResults: [],
      });
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          yield { role: 'assistant', content: 'response' };
        })()
      );

      await (view as any).handleUserInput('search query');

      expect(searchSpy).toHaveBeenCalledWith('search query', 3, expect.any(Object)); // Should use DEFAULT_VAULT_SEARCH_LIMIT
      expect(chatSpy).toHaveBeenCalled();
    });

    it('should handle errors during user input gracefully', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';

      // Mock a stream that throws an error
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockReturnValue(
        (async function* () {
          throw new Error('Network error');
        })()
      );

      const errorHandlerSpy = jest.spyOn(ErrorHandler, 'handleError').mockImplementation(() => {});

      await (view as any).handleUserInput('test');

      expect(chatSpy).toHaveBeenCalled();
      expect(errorHandlerSpy).toHaveBeenCalledWith(
        expect.objectContaining({ message: 'Network error' }),
        'ChatView.handleUserInput'
      );
      errorHandlerSpy.mockRestore();
    });

    describe('event handlers', () => {
      it('should handle send button click', async () => {
        view['sendButton'] = document.createElement('button');
        view['inputEl'] = document.createElement('textarea');
        (view['inputEl'] as HTMLTextAreaElement).value = 'test';
        (view as any).setupEventListeners();

        const handleSpy = jest.spyOn(view as any, 'handleUserInput');
        const handler = view.getSendButtonClickHandler();
        if (!handler) throw new Error('Handler not available');
        await handler();

        expect(handleSpy).toHaveBeenCalledWith('test');
        expect((view['inputEl'] as HTMLTextAreaElement).value).toBe('');
      });

      it('should handle Enter key press in input', async () => {
        view['sendButton'] = document.createElement('button');
        view['inputEl'] = document.createElement('textarea');
        (view['inputEl'] as HTMLTextAreaElement).value = 'test';
        (view as any).setupEventListeners();

        const handleSpy = jest.spyOn(view as any, 'handleUserInput');
        const event = new KeyboardEvent('keydown', { key: 'Enter' }) as any;
        const handler = view.getInputKeyDownHandler();
        if (!handler) throw new Error('Handler not available');
        await handler(event);

        expect(handleSpy).toHaveBeenCalledWith('test');
        expect((view['inputEl'] as HTMLTextAreaElement).value).toBe('');
      });

      it('should not handle Shift+Enter in input', async () => {
        view['sendButton'] = document.createElement('button');
        view['inputEl'] = document.createElement('textarea');
        (view['inputEl'] as HTMLTextAreaElement).value = 'test';
        (view as any).setupEventListeners();

        const handleSpy = jest.spyOn(view as any, 'handleUserInput');
        const event = new KeyboardEvent('keydown', { key: 'Enter', shiftKey: true }) as any;
        const handler = view.getInputKeyDownHandler();
        if (!handler) throw new Error('Handler not available');
        await handler(event);

        expect(handleSpy).not.toHaveBeenCalled();
      });

      it('should handle new chat button click', async () => {
        view['sendButton'] = document.createElement('button');
        view['inputEl'] = document.createElement('textarea');
        view['newChatButton'] = document.createElement('button');
        (view as any).setupEventListeners();

        const clearSpy = jest.spyOn(view as any, 'clearConversation');
        const handler = view.getNewChatButtonClickHandler();
        if (!handler) throw new Error('Handler not available');
        handler();

        expect(clearSpy).toHaveBeenCalled();
      });
    });

    describe('event listeners', () => {
      it('should setup event listeners on open', async () => {
        view['sendButton'] = document.createElement('button');
        view['inputEl'] = document.createElement('textarea');
        await view.onOpen();
        expect(view['sendButtonClickHandler']).not.toBeNull();
        expect(view['inputKeyDownHandler']).not.toBeNull();
      });

      it('should remove event listeners on close', async () => {
        view['sendButton'] = document.createElement('button');
        view['inputEl'] = document.createElement('textarea');
        await view.onOpen();
        const removeSpy = jest.spyOn(view, 'removeEventListeners' as any);
        await view.onClose();
        expect(removeSpy).toHaveBeenCalled();
      });
    });
  });

  describe('event handlers', () => {
    it('should handle send button click', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      (view as any).setupEventListeners();

      const handleSpy = jest.spyOn(view as any, 'handleUserInput');
      const handler = view.getSendButtonClickHandler();
      if (!handler) throw new Error('Handler not available');
      await handler();

      expect(handleSpy).toHaveBeenCalledWith('test');
      expect((view['inputEl'] as HTMLTextAreaElement).value).toBe('');
    });

    it('should handle Enter key press in input', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      (view as any).setupEventListeners();

      const handleSpy = jest.spyOn(view as any, 'handleUserInput');
      const event = new KeyboardEvent('keydown', { key: 'Enter' }) as any;
      const handler = view.getInputKeyDownHandler();
      if (!handler) throw new Error('Handler not available');
      await handler(event);

      expect(handleSpy).toHaveBeenCalledWith('test');
      expect((view['inputEl'] as HTMLTextAreaElement).value).toBe('');
    });

    it('should not handle Shift+Enter in input', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      (view as any).setupEventListeners();

      const handleSpy = jest.spyOn(view as any, 'handleUserInput');
      const event = new KeyboardEvent('keydown', { key: 'Enter', shiftKey: true }) as any;
      const handler = view.getInputKeyDownHandler();
      if (!handler) throw new Error('Handler not available');
      await handler(event);

      expect(handleSpy).not.toHaveBeenCalled();
    });

    it('should handle new chat button click', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      view['newChatButton'] = document.createElement('button');
      (view as any).setupEventListeners();

      const clearSpy = jest.spyOn(view as any, 'clearConversation');
      const handler = view.getNewChatButtonClickHandler();
      if (!handler) throw new Error('Handler not available');
      handler();

      expect(clearSpy).toHaveBeenCalled();
    });
  });

  describe('event listeners', () => {
    it('should setup event listeners on open', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      await view.onOpen();
      expect(view['sendButtonClickHandler']).not.toBeNull();
      expect(view['inputKeyDownHandler']).not.toBeNull();
    });

    it('should remove event listeners on close', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      await view.onOpen();
      const removeSpy = jest.spyOn(view, 'removeEventListeners' as any);
      await view.onClose();
      expect(removeSpy).toHaveBeenCalled();
    });
  });
});