/**
 * Tests for VikingAdapter and ContextBuilder
 *
 * Tests the ZCLAW ↔ OpenViking integration layer with mocked HTTP responses.
 */

import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { VikingHttpClient, VikingError } from '../../desktop/src/lib/viking-client';
import {
  VikingAdapter,
  VIKING_NS,
  resetVikingAdapter,
} from '../../desktop/src/lib/viking-adapter';
import {
  ContextBuilder,
  resetContextBuilder,
} from '../../desktop/src/lib/context-builder';

// === Mock fetch globally ===

const mockFetch = vi.fn();
vi.stubGlobal('fetch', mockFetch);

function mockJsonResponse(data: unknown, status = 200) {
  return {
    ok: status >= 200 && status < 300,
    status,
    statusText: status === 200 ? 'OK' : 'Error',
    json: () => Promise.resolve(data),
    text: () => Promise.resolve(JSON.stringify(data)),
  };
}

// === VikingHttpClient Tests ===

describe('VikingHttpClient', () => {
  let client: VikingHttpClient;

  beforeEach(() => {
    client = new VikingHttpClient('http://localhost:1933');
    mockFetch.mockReset();
  });

  describe('status', () => {
    it('returns server status on success', async () => {
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ status: 'ok', version: '0.1.18' })
      );

      const result = await client.status();
      expect(result.status).toBe('ok');
      expect(result.version).toBe('0.1.18');
    });

    it('throws VikingError on server error', async () => {
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ error: 'internal' }, 500)
      );

      await expect(client.status()).rejects.toThrow(VikingError);
    });
  });

  describe('isAvailable', () => {
    it('returns true when server responds ok', async () => {
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ status: 'ok' })
      );

      expect(await client.isAvailable()).toBe(true);
    });

    it('returns false when server is down', async () => {
      mockFetch.mockRejectedValueOnce(new Error('ECONNREFUSED'));

      expect(await client.isAvailable()).toBe(false);
    });
  });

  describe('find', () => {
    it('sends correct find request', async () => {
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({
          results: [
            { uri: 'viking://user/memories/preferences/lang', score: 0.9, content: '中文', level: 'L1' },
          ],
        })
      );

      const results = await client.find('language preference', {
        scope: 'viking://user/memories/',
        level: 'L1',
        limit: 10,
      });

      expect(results).toHaveLength(1);
      expect(results[0].score).toBe(0.9);
      expect(results[0].content).toBe('中文');

      // Verify request body
      const callBody = JSON.parse(mockFetch.mock.calls[0][1].body);
      expect(callBody.query).toBe('language preference');
      expect(callBody.scope).toBe('viking://user/memories/');
      expect(callBody.level).toBe('L1');
    });
  });

  describe('addResource', () => {
    it('sends correct add request', async () => {
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ uri: 'viking://user/memories/preferences/lang', status: 'ok' })
      );

      const result = await client.addResource(
        'viking://user/memories/preferences/lang',
        '用户偏好中文回复',
        { metadata: { type: 'preference' }, wait: true }
      );

      expect(result.status).toBe('ok');

      const callBody = JSON.parse(mockFetch.mock.calls[0][1].body);
      expect(callBody.uri).toBe('viking://user/memories/preferences/lang');
      expect(callBody.content).toBe('用户偏好中文回复');
      expect(callBody.wait).toBe(true);
    });
  });

  describe('extractMemories', () => {
    it('sends session content for extraction', async () => {
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({
          memories: [
            {
              category: 'user_preference',
              content: '用户喜欢简洁回答',
              tags: ['communication'],
              importance: 8,
              suggestedUri: 'viking://user/memories/preferences/communication',
            },
            {
              category: 'agent_lesson',
              content: '使用飞书API前需验证token',
              tags: ['feishu', 'api'],
              importance: 7,
              suggestedUri: 'viking://agent/zclaw/memories/lessons/feishu_token',
            },
          ],
          summary: '讨论了飞书集成和回复风格偏好',
        })
      );

      const result = await client.extractMemories(
        '[user]: 帮我集成飞书API\n[assistant]: 好的，我来...',
        'zclaw-main'
      );

      expect(result.memories).toHaveLength(2);
      expect(result.memories[0].category).toBe('user_preference');
      expect(result.memories[1].category).toBe('agent_lesson');
      expect(result.summary).toContain('飞书');
    });
  });
});

// === VikingAdapter Tests ===

describe('VikingAdapter', () => {
  let adapter: VikingAdapter;

  beforeEach(() => {
    resetVikingAdapter();
    adapter = new VikingAdapter({ serverUrl: 'http://localhost:1933' });
    mockFetch.mockReset();
  });

  describe('saveUserPreference', () => {
    it('saves to correct viking:// URI', async () => {
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ uri: 'viking://user/memories/preferences/language', status: 'ok' })
      );

      await adapter.saveUserPreference('language', '中文优先');

      const callBody = JSON.parse(mockFetch.mock.calls[0][1].body);
      expect(callBody.uri).toBe('viking://user/memories/preferences/language');
      expect(callBody.content).toBe('中文优先');
      expect(callBody.metadata.type).toBe('preference');
    });
  });

  describe('saveAgentLesson', () => {
    it('saves to agent-specific lessons URI', async () => {
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ uri: 'viking://agent/zclaw-main/memories/lessons_learned/123', status: 'ok' })
      );

      await adapter.saveAgentLesson('zclaw-main', '飞书API需要先验证token', ['feishu', 'auth']);

      const callBody = JSON.parse(mockFetch.mock.calls[0][1].body);
      expect(callBody.uri).toContain('viking://agent/zclaw-main/memories/lessons_learned/');
      expect(callBody.content).toBe('飞书API需要先验证token');
      expect(callBody.metadata.tags).toBe('feishu,auth');
    });
  });

  describe('buildEnhancedContext', () => {
    it('performs L0 scan then L1 load', async () => {
      // Mock L0 user memories search
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({
          results: [
            { uri: 'viking://user/memories/preferences/lang', score: 0.85, content: '中文', level: 'L0' },
            { uri: 'viking://user/memories/facts/project', score: 0.7, content: '飞书集成', level: 'L0' },
          ],
        })
      );
      // Mock L0 agent memories search
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({
          results: [
            { uri: 'viking://agent/zclaw/memories/lessons/feishu', score: 0.8, content: 'API认证', level: 'L0' },
          ],
        })
      );
      // Mock L1 reads for relevant items (score >= 0.5)
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ content: '用户偏好中文回复，简洁风格' })
      );
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ content: '飞书API需要先验证app_id和app_secret' })
      );
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ content: '调用飞书API前确保token未过期' })
      );

      const result = await adapter.buildEnhancedContext('帮我处理飞书集成', 'zclaw');

      expect(result.memories.length).toBeGreaterThan(0);
      expect(result.totalTokens).toBeGreaterThan(0);
      expect(result.systemPromptAddition).toContain('记忆');
    });

    it('returns empty context when Viking is unavailable', async () => {
      // Both L0 searches fail
      mockFetch.mockRejectedValue(new Error('ECONNREFUSED'));

      const result = await adapter.buildEnhancedContext('test message', 'zclaw');

      expect(result.memories).toHaveLength(0);
      expect(result.totalTokens).toBe(0);
    });
  });

  describe('extractAndSaveMemories', () => {
    it('extracts and saves memories to correct categories', async () => {
      // Mock extraction call
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({
          memories: [
            {
              category: 'user_preference',
              content: '用户喜欢TypeScript',
              tags: ['coding'],
              importance: 8,
              suggestedUri: 'viking://user/memories/preferences/coding',
            },
            {
              category: 'agent_lesson',
              content: 'Vitest配置需要在tsconfig中设置paths',
              tags: ['testing', 'vitest'],
              importance: 7,
              suggestedUri: 'viking://agent/zclaw/memories/lessons/vitest_config',
            },
          ],
          summary: '讨论了TypeScript测试配置',
        })
      );
      // Mock save calls (2 saves)
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ uri: 'viking://user/memories/preferences/coding', status: 'ok' })
      );
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ uri: 'viking://agent/zclaw/memories/lessons/123', status: 'ok' })
      );

      const result = await adapter.extractAndSaveMemories(
        [
          { role: 'user', content: '帮我配置Vitest' },
          { role: 'assistant', content: '好的，需要在tsconfig中...' },
        ],
        'zclaw'
      );

      expect(result.saved).toBe(2);
      expect(result.userMemories).toBe(1);
      expect(result.agentMemories).toBe(1);
    });

    it('handles extraction failure gracefully', async () => {
      mockFetch.mockRejectedValueOnce(new Error('Server error'));

      const result = await adapter.extractAndSaveMemories(
        [{ role: 'user', content: 'test' }],
        'zclaw'
      );

      expect(result.saved).toBe(0);
    });
  });

  describe('VIKING_NS', () => {
    it('generates correct namespace URIs', () => {
      expect(VIKING_NS.userPreferences).toBe('viking://user/memories/preferences');
      expect(VIKING_NS.agentLessons('zclaw')).toBe('viking://agent/zclaw/memories/lessons_learned');
      expect(VIKING_NS.agentIdentity('zclaw')).toBe('viking://agent/zclaw/identity');
    });
  });
});

// === ContextBuilder Tests ===

describe('ContextBuilder', () => {
  let builder: ContextBuilder;

  beforeEach(() => {
    resetContextBuilder();
    resetVikingAdapter();
    builder = new ContextBuilder({ enabled: true });
    mockFetch.mockReset();
  });

  describe('buildContext', () => {
    it('returns empty prompt when disabled', async () => {
      builder.updateConfig({ enabled: false });

      const result = await builder.buildContext('test', 'zclaw');

      expect(result.systemPrompt).toBe('');
      expect(result.tokensUsed).toBe(0);
    });

    it('returns empty prompt when Viking is unavailable', async () => {
      // isAvailable check fails
      mockFetch.mockRejectedValue(new Error('ECONNREFUSED'));

      const result = await builder.buildContext('test', 'zclaw');

      expect(result.memoriesInjected).toBe(0);
    });
  });

  describe('checkAndCompact', () => {
    it('returns null when under threshold', async () => {
      const messages = [
        { role: 'user' as const, content: '你好' },
        { role: 'assistant' as const, content: '你好！有什么可以帮你？' },
      ];

      const result = await builder.checkAndCompact(messages, 'zclaw');
      expect(result).toBeNull();
    });

    it('compacts and flushes memory when over threshold', async () => {
      // Create messages that exceed the threshold
      const longContent = '这是一段很长的对话内容。'.repeat(500);
      const messages = [
        { role: 'user' as const, content: longContent },
        { role: 'assistant' as const, content: longContent },
        { role: 'user' as const, content: longContent },
        { role: 'assistant' as const, content: longContent },
        { role: 'user' as const, content: '最近的消息1' },
        { role: 'assistant' as const, content: '最近的消息2' },
        { role: 'user' as const, content: '最近的消息3' },
        { role: 'assistant' as const, content: '最近的消息4' },
        { role: 'user' as const, content: '最近的消息5' },
        { role: 'assistant' as const, content: '最近的回复5' },
      ];

      // Mock memory flush extraction call
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({
          memories: [
            {
              category: 'user_fact',
              content: '讨论了长文本处理',
              tags: ['text'],
              importance: 5,
              suggestedUri: 'viking://user/memories/facts/text',
            },
          ],
          summary: '长文本处理讨论',
        })
      );
      // Mock save call for flushed memory
      mockFetch.mockResolvedValueOnce(
        mockJsonResponse({ uri: 'viking://user/memories/facts/text/123', status: 'ok' })
      );

      builder.updateConfig({ compactionThresholdTokens: 100 }); // Low threshold for test
      const result = await builder.checkAndCompact(messages, 'zclaw');

      expect(result).not.toBeNull();
      expect(result!.compactedMessages.length).toBeLessThan(messages.length);
      expect(result!.compactedMessages[0].content).toContain('对话摘要');
      // Recent messages preserved
      expect(result!.compactedMessages.some(m => m.content === '最近的回复5')).toBe(true);
    });
  });

  describe('extractMemoriesFromConversation', () => {
    it('skips extraction when disabled', async () => {
      builder.updateConfig({ autoExtractOnComplete: false });

      const result = await builder.extractMemoriesFromConversation(
        [
          { role: 'user', content: '你好' },
          { role: 'assistant', content: '你好！' },
        ],
        'zclaw'
      );

      expect(result.saved).toBe(0);
    });

    it('skips extraction for short conversations', async () => {
      const result = await builder.extractMemoriesFromConversation(
        [{ role: 'user', content: '你好' }],
        'zclaw'
      );

      expect(result.saved).toBe(0);
    });
  });

  describe('configuration', () => {
    it('can update and read config', () => {
      builder.updateConfig({ maxMemoryTokens: 4000, enabled: false });

      const config = builder.getConfig();
      expect(config.maxMemoryTokens).toBe(4000);
      expect(config.enabled).toBe(false);
      expect(builder.isEnabled()).toBe(false);
    });
  });
});