import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { mkdtempSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { init } from '../src/cli/commands/init.js';
import { loadConfig, saveConfig } from '../src/core/config.js';
import {
  DEFAULT_TASK_LIST_LIMIT,
  DEFAULT_WORK_TIMEOUT_SEC,
  boundedTaskList,
  resolveMcpContext,
} from '../src/mcp/server.js';

describe('MCP context resolution', () => {
  let cwd: string;
  const originalEnv = process.env.AGENTHUB_SERVER;

  beforeEach(() => {
    cwd = mkdtempSync(join(tmpdir(), 'ah-mcp-'));
    init(cwd, { projectName: 'mcp-test', yes: true });
    delete process.env.AGENTHUB_SERVER;
  });

  afterEach(() => {
    if (originalEnv === undefined) delete process.env.AGENTHUB_SERVER;
    else process.env.AGENTHUB_SERVER = originalEnv;
    rmSync(cwd, { recursive: true, force: true });
  });

  it('self-heals a stale configured server URL before MCP tools call remote APIs', async () => {
    const config = loadConfig(cwd);
    config.serverUrl = 'http://agenthub.local:3377';
    saveConfig(cwd, config);

    const context = await resolveMcpContext(cwd, {
      probe: async () => false,
      discover: async () => 'http://127.0.0.1:3377',
    });

    expect(context).toEqual({ root: cwd, serverUrl: 'http://127.0.0.1:3377' });
  });
});

describe('MCP bounded defaults', () => {
  it('uses a client-safe work timeout', () => {
    expect(DEFAULT_WORK_TIMEOUT_SEC).toBe(50);
  });

  it('returns task lists newest-first with explicit truncation metadata', () => {
    const tasks = Array.from({ length: 55 }, (_, i) => ({
      id: `TSK-${String(i).padStart(4, '0')}`,
      updatedAt: new Date(Date.UTC(2026, 0, i + 1)).toISOString(),
    }));
    const result = boundedTaskList(tasks);
    expect(result).toMatchObject({ total: 55, returned: DEFAULT_TASK_LIST_LIMIT, omitted: 5 });
    expect(result.tasks[0].id).toBe('TSK-0054');
    expect(result.tasks.at(-1)?.id).toBe('TSK-0005');
  });
});