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

// Mock Obsidian types
interface MockVault {
  getMarkdownFiles: () => any[];
  read: () => Promise<string>;
  create: () => Promise<any>;
}
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',
  model: 'llama3',
  lastIndexTime: 0,
};

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

  beforeEach(() => {
    mockApp = {
      vault: {
        getMarkdownFiles: jest.fn().mockReturnValue([]),
        read: jest.fn().mockResolvedValue(''),
        create: jest.fn().mockResolvedValue(null),
      },
      workspace: {
        getLeaf: jest.fn(),
        revealLeaf: jest.fn(),
      },
    };

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

    view = new ChatView(mockLeaf as unknown as any, mockSettings);
    // 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;
  });

  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('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 cancelSpy = jest.spyOn(view['ollamaClient'], 'cancelStream');
      const removeSpy = jest.spyOn(view, 'removeEventListeners' as any);
      await view.onClose();
      expect(view['lastMessageEl']).toBeNull();
      expect(view['sendButton']).toBeNull();
      expect(view['inputEl']).toBeNull();
      expect(cancelSpy).toHaveBeenCalled();
      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').mockResolvedValue({
        [Symbol.asyncIterator]: async function* () {
          yield { content: 'test' };
        },
      } as any);
      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 process tool calls with follow-up context', async () => {
      view['sendButton'] = document.createElement('button');
      view['inputEl'] = document.createElement('textarea');
      (view['inputEl'] as HTMLTextAreaElement).value = 'test';
      const chatSpy = jest.spyOn(view['ollamaClient'], 'streamChat').mockResolvedValue({
        [Symbol.asyncIterator]: async function* () {
          yield {
            content: 'test',
            tool_calls: [{ function: { name: 'create_file', arguments: '{}' } }],
          };
        },
      } as any);
      const followUpSpy = jest
        .spyOn(view['ollamaClient'], 'chat')
        .mockResolvedValue({ content: ' follow-up' });
      await (view as any).handleUserInput('test');
      expect(followUpSpy).toHaveBeenCalled();
      // Verify that tool calls resulted in follow-up messages
      expect((view as any).messages.length).toBeGreaterThan(1);
    });
  });

  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();
    });
  });
});