/**
 * ToolRegistry 单元测试（P1-14 测试基线）
 * 覆盖：truncateResult 截断、未知工具错误、工具超时
 */

import { describe, it, expect } from 'vitest';
import { ToolRegistry } from '../registry';
import type { IMetonaTool, ToolExecutionContext } from '../../types/metona-tool';

function createContext(overrides?: Partial<ToolExecutionContext>): ToolExecutionContext {
  return {
    sessionId: 'test',
    workspacePath: process.cwd(),
    iteration: 1,
    requestId: 'req_test',
    ...overrides,
  };
}

describe('ToolRegistry.truncateResult', () => {
  const registry = new ToolRegistry();
  // 访问私有方法
  const truncate = (result: unknown) =>
    (registry as unknown as { truncateResult: (r: unknown) => unknown }).truncateResult(result);

  it('小结果原样返回', () => {
    const small = { data: 'x'.repeat(100) };
    expect(truncate(small)).toBe(small);
  });

  it('大字符串结果被截断并附加 _truncated 标记', () => {
    const big = 'a'.repeat(500_000);
    const truncated = truncate(big) as { _preview: string; _original_size: number; _truncated: boolean };
    expect(truncated._truncated).toBe(true);
    expect(truncated._original_size).toBe(500_000);
    expect(truncated._preview.length).toBeLessThan(big.length);
  });

  it('大对象结果被截断', () => {
    const bigObj = { content: 'a'.repeat(400_000), extra: 'b'.repeat(200_000) };
    const truncated = truncate(bigObj) as { _truncated: boolean };
    expect(truncated._truncated).toBe(true);
  });

  it('view_image 的 dataUrl 白名单不截断（原对象引用返回）', () => {
    const obj = { dataUrl: `data:image/png;base64,${'a'.repeat(200_000)}` };
    expect(truncate(obj)).toBe(obj);
  });

  it('null/undefined/number 安全返回', () => {
    expect(truncate(null)).toBe(null);
    expect(truncate(undefined)).toBe(undefined);
    expect(truncate(42)).toBe(42);
  });
});

describe('ToolRegistry.execute', () => {
  it('未知工具返回错误结果', async () => {
    const registry = new ToolRegistry();
    const result = await registry.execute(
      { id: 'tc_1', name: 'not_exist', args: {}, iteration: 1, timestamp: Date.now() },
      createContext(),
    );
    expect(result.success).toBe(false);
    expect(result.error).toContain('Unknown tool');
  });

  it('工具超时返回错误结果', async () => {
    const registry = new ToolRegistry();
    const slowTool: IMetonaTool = {
      definition: {
        name: 'slow_tool',
        description: 'slows',
        parameters: { type: 'object', properties: {} },
        category: 'CODE_EXECUTION' as never,
        riskLevel: 'SAFE' as never,
        requiresPermission: false,
        timeoutMs: 20,
      },
      execute: async () => {
        await new Promise((r) => setTimeout(r, 200));
        return 'too late';
      },
    };
    registry.registerBuiltin(slowTool);
    const result = await registry.execute(
      { id: 'tc_2', name: 'slow_tool', args: {}, iteration: 1, timestamp: Date.now() },
      createContext(),
    );
    expect(result.success).toBe(false);
    expect(result.error).toContain('timed out');
  });

  it('正常执行返回结果', async () => {
    const registry = new ToolRegistry();
    registry.registerBuiltin({
      definition: {
        name: 'fast_tool',
        description: 'fast',
        parameters: { type: 'object', properties: {} },
        category: 'CODE_EXECUTION' as never,
        riskLevel: 'SAFE' as never,
        requiresPermission: false,
        timeoutMs: 5_000,
      },
      execute: async () => 'done',
    });
    const result = await registry.execute(
      { id: 'tc_3', name: 'fast_tool', args: {}, iteration: 1, timestamp: Date.now() },
      createContext(),
    );
    expect(result.success).toBe(true);
    expect(result.result).toBe('done');
  });
});