/**
 * Vector Memory Tests - Phase 4.2 Semantic Search
 *
 * Tests for vector-based semantic memory search:
 * - VectorMemoryService initialization
 * - Semantic search with OpenViking
 * - Similar memory finding
 * - Clustering functionality
 */

import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import {
  VectorMemoryService,
  getVectorMemory,
  resetVectorMemory,
  semanticSearch,
  findSimilarMemories,
  isVectorSearchAvailable,
  DEFAULT_VECTOR_CONFIG,
  type VectorSearchOptions,
  type VectorSearchResult,
} from '../../desktop/src/lib/vector-memory';
import { getVikingClient, resetVikingClient } from '../../desktop/src/lib/viking-client';
import { getMemoryManager, resetMemoryManager } from '../../desktop/src/lib/agent-memory';

// === Mock Dependencies ===

const mockVikingClient = {
  isAvailable: vi.fn(async () => true),
  find: vi.fn(async () => [
    { uri: 'memories/agent1/memory1', content: '用户偏好简洁的回答', score: 0.9, metadata: { tags: ['preference'] } },
    { uri: 'memories/agent1/memory2', content: '项目使用 TypeScript', score: 0.7, metadata: { tags: ['fact'] } },
    { uri: 'memories/agent1/memory3', content: '需要完成性能测试', score: 0.5, metadata: { tags: ['task'] } },
  ]),
  addResource: vi.fn(async () => ({ uri: 'test', status: 'ok' })),
  removeResource: vi.fn(async () => undefined),
};

vi.mock('../../desktop/src/lib/viking-client', () => ({
  getVikingClient: vi.fn(() => mockVikingClient),
  resetVikingClient: vi.fn(),
  VikingHttpClient: vi.fn(),
}));

const mockMemoryManager = {
  getByAgent: vi.fn(() => [
    { id: 'memory1', agentId: 'agent1', content: '用户偏好简洁的回答', type: 'preference', importance: 7, createdAt: new Date().toISOString(), source: 'auto', tags: ['style'], lastAccessedAt: new Date().toISOString(), accessCount: 0 },
    { id: 'memory2', agentId: 'agent1', content: '项目使用 TypeScript', type: 'fact', importance: 6, createdAt: new Date().toISOString(), source: 'auto', tags: ['tech'], lastAccessedAt: new Date().toISOString(), accessCount: 0 },
    { id: 'memory3', agentId: 'agent1', content: '需要完成性能测试', type: 'task', importance: 8, createdAt: new Date().toISOString(), source: 'auto', tags: ['todo'], lastAccessedAt: new Date().toISOString(), accessCount: 0 },
  ]),
  getAll: vi.fn(async () => [
    { id: 'memory1', agentId: 'agent1', content: '用户偏好简洁的回答', type: 'preference', importance: 7, createdAt: new Date().toISOString(), source: 'auto', tags: ['style'], lastAccessedAt: new Date().toISOString(), accessCount: 0 },
    { id: 'memory2', agentId: 'agent1', content: '项目使用 TypeScript', type: 'fact', importance: 6, createdAt: new Date().toISOString(), source: 'auto', tags: ['tech'], lastAccessedAt: new Date().toISOString(), accessCount: 0 },
    { id: 'memory3', agentId: 'agent1', content: '需要完成性能测试', type: 'task', importance: 8, createdAt: new Date().toISOString(), source: 'auto', tags: ['todo'], lastAccessedAt: new Date().toISOString(), accessCount: 0 },
  ]),
  save: vi.fn(async () => 'memory-id'),
};

vi.mock('../../desktop/src/lib/agent-memory', () => ({
  getMemoryManager: vi.fn(() => mockMemoryManager),
  resetMemoryManager: vi.fn(),
}));

// === VectorMemoryService Tests ===

describe('VectorMemoryService', () => {
  let service: VectorMemoryService;

  beforeEach(() => {
    vi.clearAllMocks();
    resetVectorMemory();
    resetVikingClient();
    service = new VectorMemoryService();
  });

  afterEach(() => {
    resetVectorMemory();
  });

  describe('Initialization', () => {
    it('should initialize with default config', () => {
      const config = service.getConfig();
      expect(config.enabled).toBe(true);
      expect(config.defaultTopK).toBe(10);
      expect(config.defaultMinScore).toBe(0.3);
      expect(config.defaultLevel).toBe('L1');
    });

    it('should accept custom config', () => {
      const customService = new VectorMemoryService({
        defaultTopK: 20,
        defaultMinScore: 0.5,
      });
      const config = customService.getConfig();
      expect(config.defaultTopK).toBe(20);
      expect(config.defaultMinScore).toBe(0.5);
    });

    it('should update config', () => {
      service.updateConfig({ defaultTopK: 15 });
      const config = service.getConfig();
      expect(config.defaultTopK).toBe(15);
    });
  });

  describe('Semantic Search', () => {
    it('should perform semantic search', async () => {
      const results = await service.semanticSearch('用户偏好');

      expect(mockVikingClient.find).toHaveBeenCalled();
      expect(results.length).toBeGreaterThan(0);
      expect(results[0].score).toBeGreaterThanOrEqual(0);
    });

    it('should respect topK option', async () => {
      await service.semanticSearch('测试', { topK: 5 });

      expect(mockVikingClient.find).toHaveBeenCalledWith(
        '测试',
        expect.objectContaining({ limit: 5 })
      );
    });

    it('should respect minScore option', async () => {
      await service.semanticSearch('测试', { minScore: 0.8 });

      expect(mockVikingClient.find).toHaveBeenCalledWith(
        '测试',
        expect.objectContaining({ minScore: 0.8 })
      );
    });

    it('should respect level option', async () => {
      await service.semanticSearch('测试', { level: 'L2' });

      expect(mockVikingClient.find).toHaveBeenCalledWith(
        '测试',
        expect.objectContaining({ level: 'L2' })
      );
    });

    it('should return empty array when disabled', async () => {
      service.updateConfig({ enabled: false });
      const results = await service.semanticSearch('测试');

      expect(results).toEqual([]);
    });

    it('should filter by types when specified', async () => {
      const results = await service.semanticSearch('用户偏好', { types: ['preference'] });

      // Should only return preference type memories
      for (const result of results) {
        expect(result.memory.type).toBe('preference');
      }
    });
  });

  describe('Find Similar', () => {
    it('should find similar memories', async () => {
      const results = await service.findSimilar('memory1', { agentId: 'agent1' });

      expect(mockMemoryManager.getAll).toHaveBeenCalledWith('agent1');
      expect(mockVikingClient.find).toHaveBeenCalled();
    });

    it('should return empty array for non-existent memory', async () => {
      mockMemoryManager.getAll.mockResolvedValueOnce([]);

      const results = await service.findSimilar('non-existent', { agentId: 'agent1' });

      expect(results).toEqual([]);
    });
  });

  describe('Find By Concept', () => {
    it('should find memories by concept', async () => {
      const results = await service.findByConcept('代码优化');

      expect(mockVikingClient.find).toHaveBeenCalledWith(
        '代码优化',
        expect.any(Object)
      );
      expect(results.length).toBeGreaterThanOrEqual(0);
    });
  });

  describe('Clustering', () => {
    it('should cluster memories', async () => {
      const clusters = await service.clusterMemories('agent1', 3);

      expect(mockMemoryManager.getAll).toHaveBeenCalledWith('agent1');
      expect(Array.isArray(clusters)).toBe(true);
    });

    it('should return empty array for agent with no memories', async () => {
      mockMemoryManager.getAll.mockResolvedValueOnce([]);

      const clusters = await service.clusterMemories('empty-agent');

      expect(clusters).toEqual([]);
    });
  });

  describe('Availability', () => {
    it('should check availability', async () => {
      const available = await service.isAvailable();

      expect(available).toBe(true);
    });

    it('should return false when disabled', async () => {
      service.updateConfig({ enabled: false });
      const available = await service.isAvailable();

      expect(available).toBe(false);
    });
  });

  describe('Cache', () => {
    it('should clear cache', () => {
      service.clearCache();
      // No error means success
      expect(true).toBe(true);
    });
  });
});

// === Helper Function Tests ===

describe('Helper Functions', () => {
  beforeEach(() => {
    vi.clearAllMocks();
    resetVectorMemory();
  });

  afterEach(() => {
    resetVectorMemory();
  });

  describe('getVectorMemory', () => {
    it('should return singleton instance', () => {
      const instance1 = getVectorMemory();
      const instance2 = getVectorMemory();

      expect(instance1).toBe(instance2);
    });
  });

  describe('semanticSearch helper', () => {
    it('should call service.semanticSearch', async () => {
      const results = await semanticSearch('测试查询');

      expect(mockVikingClient.find).toHaveBeenCalled();
      expect(Array.isArray(results)).toBe(true);
    });
  });

  describe('findSimilarMemories helper', () => {
    it('should call service.findSimilar', async () => {
      const results = await findSimilarMemories('memory1', 'agent1');

      expect(mockMemoryManager.getAll).toHaveBeenCalled();
      expect(Array.isArray(results)).toBe(true);
    });
  });

  describe('isVectorSearchAvailable helper', () => {
    it('should call service.isAvailable', async () => {
      const available = await isVectorSearchAvailable();

      expect(typeof available).toBe('boolean');
    });
  });
});

// === Integration Tests ===

describe('VectorMemoryService Integration', () => {
  it('should handle Viking client errors gracefully', async () => {
    mockVikingClient.find.mockRejectedValueOnce(new Error('Connection failed'));

    const service = new VectorMemoryService();
    const results = await service.semanticSearch('测试');

    expect(results).toEqual([]);
  });

  it('should handle missing Viking client gracefully', async () => {
    vi.mocked(getVikingClient).mockImplementation(() => {
      throw new Error('Viking not available');
    });

    const service = new VectorMemoryService();
    const results = await service.semanticSearch('测试');

    expect(results).toEqual([]);
  });
});