import { describe, it, expect, beforeEach, vi } from 'vitest';

// Mock state
const mockState = {
  generateTextResult: {
    text: '任务完成',
    steps: [{ toolCalls: [] }],
  },
  streamTextResult: {
    textStream: (async function* () {
      yield '流式';
      yield '输出';
    })(),
    response: Promise.resolve({}),
  },
};

// Mock @ai-sdk/anthropic
vi.mock('@ai-sdk/anthropic', () => ({
  createAnthropic: vi.fn(() => vi.fn(() => ({ modelId: 'claude-3' }))),
}));

// Mock @ai-sdk/deepseek
vi.mock('@ai-sdk/deepseek', () => ({
  createDeepSeek: vi.fn(() => vi.fn(() => ({ modelId: 'deepseek' }))),
}));

// Mock ai package
vi.mock('ai', () => ({
  generateText: vi.fn(async () => mockState.generateTextResult),
  streamText: vi.fn(() => mockState.streamTextResult),
  stepCountIs: vi.fn(() => () => false),
}));

// Mock permission-merger
vi.mock('../../../src/agent/permission-merger.js', () => ({
  checkBashPermission: vi.fn(() => 'allow'),
}));

// Mock types
vi.mock('../../../src/types/index.js', () => ({
  buildZodSchema: vi.fn(() => ({})),
}));

import { AgentExecutor } from '../../../src/agent/executor.js';
import { generateText, streamText } from 'ai';
import { checkBashPermission } from '../../../src/agent/permission-merger.js';

describe('AgentExecutor - Agent 执行器', () => {
  let executor: AgentExecutor;
  let mockToolRegistry: any;
  let mockAgentInfo: any;
  let mockBaseConfig: any;

  beforeEach(() => {
    vi.clearAllMocks();

    mockToolRegistry = {
      getAllTools: vi.fn(() => [
        {
          name: 'bash',
          description: '执行命令',
          parameters: { command: { type: 'string', required: true } },
          execute: vi.fn().mockResolvedValue({ success: true, output: 'ok' }),
        },
        {
          name: 'read_file',
          description: '读取文件',
          parameters: { path: { type: 'string', required: true } },
          execute: vi.fn().mockResolvedValue({ success: true, output: 'content' }),
        },
        {
          name: 'task',
          description: '子任务',
          parameters: { prompt: { type: 'string', required: true } },
          execute: vi.fn().mockResolvedValue({ success: true, output: 'done' }),
        },
      ]),
    };

    mockAgentInfo = {
      name: 'test-agent',
      description: '测试 Agent',
      mode: 'subagent',
      prompt: '你是测试助手',
    };

    mockBaseConfig = {
      provider: 'anthropic',
      model: 'claude-3-sonnet',
      apiKey: 'test-api-key',
      maxTokens: 4096,
      systemPrompt: '默认系统提示词',
    };

    // 重置 mock 结果
    mockState.generateTextResult = {
      text: '任务完成',
      steps: [{ toolCalls: [] }],
    };

    executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);
  });

  describe('构造函数', () => {
    it('成功创建 Anthropic provider', () => {
      const exec = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);
      expect(exec).toBeDefined();
    });

    it('成功创建 DeepSeek provider', () => {
      const config = { ...mockBaseConfig, provider: 'deepseek' as const };
      const exec = new AgentExecutor(mockAgentInfo, config, mockToolRegistry);
      expect(exec).toBeDefined();
    });

    it('不支持的 provider 抛出错误', () => {
      const config = { ...mockBaseConfig, provider: 'unknown' as any };
      expect(() => new AgentExecutor(mockAgentInfo, config, mockToolRegistry)).toThrow('不支持的 provider');
    });

    it('使用 Agent 指定的 provider', () => {
      const agentInfo = {
        ...mockAgentInfo,
        model: { provider: 'deepseek' as const, model: 'deepseek-chat' },
      };
      const exec = new AgentExecutor(agentInfo, mockBaseConfig, mockToolRegistry);
      expect(exec).toBeDefined();
    });
  });

  describe('execute - 执行', () => {
    it('非流式模式成功执行', async () => {
      const result = await executor.execute('测试任务', {});

      expect(result.success).toBe(true);
      expect(result.text).toBe('任务完成');
      expect(generateText).toHaveBeenCalled();
    });

    it('流式模式成功执行', async () => {
      const onStream = vi.fn();

      // 重置流式结果
      mockState.streamTextResult = {
        textStream: (async function* () {
          yield '流式';
          yield '输出';
        })(),
        response: Promise.resolve({}),
      };

      const result = await executor.execute('测试任务', { onStream });

      expect(result.success).toBe(true);
      expect(result.text).toBe('流式输出');
      expect(streamText).toHaveBeenCalled();
      expect(onStream).toHaveBeenCalledWith('流式');
      expect(onStream).toHaveBeenCalledWith('输出');
    });

    it('执行失败返回错误', async () => {
      vi.mocked(generateText).mockRejectedValueOnce(new Error('API 错误'));

      const result = await executor.execute('测试任务', {});

      expect(result.success).toBe(false);
      expect(result.error).toContain('API 错误');
    });

    it('传递父会话 ID', async () => {
      const result = await executor.execute('测试任务', {
        parentSessionId: 'parent-123',
      });

      expect(result.sessionId).toBe('parent-123');
    });

    it('无父会话 ID 使用 standalone', async () => {
      const result = await executor.execute('测试任务', {});

      expect(result.sessionId).toBe('standalone');
    });
  });

  describe('工具过滤', () => {
    it('无配置返回所有工具', async () => {
      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      expect(Object.keys(call.tools || {})).toHaveLength(3);
    });

    it('enabled 配置只保留指定工具', async () => {
      mockAgentInfo.tools = { enabled: ['bash'] };
      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);

      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      expect(Object.keys(call.tools || {})).toContain('bash');
      expect(Object.keys(call.tools || {})).not.toContain('read_file');
    });

    it('disabled 配置移除指定工具', async () => {
      mockAgentInfo.tools = { disabled: ['task'] };
      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);

      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      expect(Object.keys(call.tools || {})).not.toContain('task');
    });

    it('noTask 配置移除 task 工具', async () => {
      mockAgentInfo.tools = { noTask: true };
      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);

      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      expect(Object.keys(call.tools || {})).not.toContain('task');
    });
  });

  describe('权限检查', () => {
    it('bash 命令被拒绝', async () => {
      vi.mocked(checkBashPermission).mockReturnValue('deny');
      mockAgentInfo.permission = { bash: { deny: ['rm *'] } };
      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);

      // 获取工具并执行
      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      const bashTool = call.tools?.bash;

      if (bashTool && 'execute' in bashTool) {
        const result = await bashTool.execute({ command: 'rm -rf /' });
        expect(result.success).toBe(false);
        expect(result.error).toContain('权限拒绝');
      }
    });

    it('文件写入被拒绝', async () => {
      mockAgentInfo.permission = { file: { write: 'deny' } };

      // 添加 write_file 工具
      mockToolRegistry.getAllTools.mockReturnValue([
        {
          name: 'write_file',
          description: '写文件',
          parameters: { path: { type: 'string', required: true } },
          execute: vi.fn().mockResolvedValue({ success: true, output: 'ok' }),
        },
      ]);

      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);
      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      const writeTool = call.tools?.write_file;

      if (writeTool && 'execute' in writeTool) {
        const result = await writeTool.execute({ path: '/test.txt', content: 'test' });
        expect(result.success).toBe(false);
        expect(result.error).toContain('权限拒绝');
      }
    });

    it('Git 写操作被拒绝', async () => {
      mockAgentInfo.permission = { git: { write: 'deny' } };

      mockToolRegistry.getAllTools.mockReturnValue([
        {
          name: 'git_push',
          description: 'Git push',
          parameters: {},
          execute: vi.fn().mockResolvedValue({ success: true, output: 'ok' }),
        },
      ]);

      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);
      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      const gitTool = call.tools?.git_push;

      if (gitTool && 'execute' in gitTool) {
        const result = await gitTool.execute({});
        expect(result.success).toBe(false);
        expect(result.error).toContain('Git 写操作被禁止');
      }
    });

    it('无权限配置允许所有操作', async () => {
      // 无 permission 配置
      delete mockAgentInfo.permission;
      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);
      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      const bashTool = call.tools?.bash;

      if (bashTool && 'execute' in bashTool) {
        const result = await bashTool.execute({ command: 'ls' });
        expect(result.success).toBe(true);
      }
    });
  });

  describe('系统提示词', () => {
    it('使用 Agent 自定义提示词', async () => {
      mockAgentInfo.prompt = '自定义提示词';
      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);

      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      expect(call.system).toBe('自定义提示词');
    });

    it('无自定义提示词使用基础配置', async () => {
      delete mockAgentInfo.prompt;
      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);

      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      expect(call.system).toBe('默认系统提示词');
    });
  });

  describe('模型配置', () => {
    it('使用 Agent 指定的模型', async () => {
      mockAgentInfo.model = { model: 'claude-3-opus' };
      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);

      await executor.execute('测试', {});

      expect(generateText).toHaveBeenCalled();
    });

    it('使用 Agent 指定的 maxSteps', async () => {
      mockAgentInfo.maxSteps = 5;
      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);

      await executor.execute('测试', {});

      expect(generateText).toHaveBeenCalled();
    });

    it('使用 Agent 指定的 maxTokens', async () => {
      mockAgentInfo.model = { maxTokens: 8192 };
      executor = new AgentExecutor(mockAgentInfo, mockBaseConfig, mockToolRegistry);

      await executor.execute('测试', {});

      const call = vi.mocked(generateText).mock.calls[0][0];
      expect(call.maxOutputTokens).toBe(8192);
    });
  });
});