/**
 * MCPManager getPrompt / readResource 测试（v0.8.1 P1-4）
 *
 * prompts/resources 对话内可用化的主进程侧契约：
 * 1. getPrompt：messages 展平为文本（text 块拼接、多消息 \n\n 连接）、
 *    未连接 server 显式抛错；
 * 2. readResource：text 内容返回、二进制（blob）显式拒绝、
 *    空 contents 返回 null。
 *
 * 通过反射注入受控 server 状态（绕开真实 SDK 连接），与 IPC 层解耦。
 */

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

vi.mock('electron-log', () => ({
  default: { info: vi.fn(), warn: vi.fn(), error: vi.fn(), debug: vi.fn() },
}));

import { MCPManager } from '../mcp-manager.service';
import type { ToolRegistry } from '../../harness/tools/registry';

function makeManager(): MCPManager {
  const fakeDB = {
    prepare: () => ({ run: () => ({ changes: 0 }) }),
  } as unknown as ConstructorParameters<typeof MCPManager>[0] extends () => infer D ? D : never;
  const registry = {
    registerMCP: vi.fn(() => true),
    unregisterMCPTools: vi.fn(),
  } as unknown as ToolRegistry;
  return new MCPManager(() => fakeDB, registry);
}

/** 反射注入受控 server 状态（mock client） */
function injectServer(manager: MCPManager, client: Record<string, ReturnType<typeof vi.fn>>): void {
  const states = (
    manager as unknown as {
      servers: Map<
        string,
        {
          config: { name: string };
          status: string;
          client: unknown;
          tools: unknown[];
          resources: unknown[];
          prompts: unknown[];
        }
      >;
    }
  ).servers;
  states.set('test-server', {
    config: { name: 'test-server' } as never,
    status: 'connected',
    client: client as never,
    tools: [],
    resources: [],
    prompts: [],
  });
}

describe('MCPManager — getPrompt（v0.8.1 P1-4）', () => {
  it('messages 展平为文本，多消息以空行连接', async () => {
    const manager = makeManager();
    injectServer(manager, {
      getPrompt: vi.fn().mockResolvedValue({
        description: 'demo prompt',
        messages: [
          { role: 'user', content: { type: 'text', text: 'Line A' } },
          { role: 'user', content: { type: 'text', text: 'Line B' } },
        ],
      }),
    });
    const result = await manager.getPrompt('test-server', 'demo');
    expect(result).not.toBeNull();
    expect(result!.text).toBe('Line A\n\nLine B');
    expect(result!.description).toBe('demo prompt');
  });

  it('server 未连接 → 显式抛错（调用方以 error 返回）', async () => {
    const manager = makeManager();
    await expect(manager.getPrompt('nope', 'demo')).rejects.toThrow(/not connected/);
  });
});

describe('MCPManager — readResource（v0.8.1 P1-4）', () => {
  it('text 内容正常返回', async () => {
    const manager = makeManager();
    injectServer(manager, {
      readResource: vi.fn().mockResolvedValue({
        contents: [{ uri: 'file:///a.txt', text: 'hello resource', mimeType: 'text/plain' }],
      }),
    });
    const result = await manager.readResource('test-server', 'file:///a.txt');
    expect(result).toEqual({ text: 'hello resource', mimeType: 'text/plain' });
  });

  it('二进制（blob）内容显式拒绝', async () => {
    const manager = makeManager();
    injectServer(manager, {
      readResource: vi.fn().mockResolvedValue({
        contents: [{ uri: 'file:///a.png', blob: 'aGVsbG8=' }],
      }),
    });
    await expect(manager.readResource('test-server', 'file:///a.png')).rejects.toThrow(/binary/);
  });

  it('空 contents → null', async () => {
    const manager = makeManager();
    injectServer(manager, {
      readResource: vi.fn().mockResolvedValue({ contents: [] }),
    });
    expect(await manager.readResource('test-server', 'file:///none')).toBeNull();
  });
});