import { describe, expect, it, vi, beforeEach } from 'vitest';
import { render, screen, waitFor } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import React from 'react';

import AddressInput from '../../src/components/AddressInput';
import * as api from '../../src/api/client';
import type { SessionCandidate } from '../../src/types';

/**
 * 三段式地址补全。
 *
 * 每条断言都对应一个真实存在过或很容易犯的错：
 *   - 问错层（写了 @ 还在问 name 的候选）
 *   - 过滤后 suggestions 与 candidates 错位，标题挂到别的别名上
 *   - 选中 name 后没自动补 `@`，人得自己敲
 *   - session 段选完还开着下拉，挡住下面的输入框
 */

/** 造一个 suggestAddress 的响应。candidates 与 suggestions 必须同序同长。 */
function res(
  kind: 'name' | 'path' | 'session',
  suggestions: string[],
  candidates?: Partial<SessionCandidate>[]
) {
  return {
    kind,
    suggestions,
    candidates: candidates?.map((c, i) => ({
      alias: suggestions[i],
      title: '',
      source: 'mail' as const,
      unread: 0,
      ...c
    }))
  };
}

/** 渲染一个受控的 AddressInput，返回 input 与「当前值」读取器。 */
function setup(initial = '') {
  let current = initial;
  const onChange = vi.fn((v: string) => {
    current = v;
    rerender();
  });
  const { rerender: rr } = render(
    React.createElement(AddressInput, { value: current, onChange })
  );
  function rerender() {
    rr(React.createElement(AddressInput, { value: current, onChange }));
  }
  return {
    onChange,
    value: () => current,
    input: () => screen.getByRole('textbox') as HTMLInputElement
  };
}

describe('AddressInput 三段式补全', () => {
  beforeEach(() => {
    vi.restoreAllMocks();
  });

  it('还没写 @ 时问 name 层', async () => {
    const spy = vi.spyOn(api, 'suggestAddress').mockResolvedValue(res('name', ['dsh', 'opencode']));
    const { input } = setup();

    await userEvent.click(input());
    await userEvent.type(input(), 'ds');

    await waitFor(() => expect(spy).toHaveBeenCalled());
    // 问 name 层时不带任何参数
    expect(spy.mock.calls[spy.mock.calls.length - 1]).toEqual([]);
  });

  it('写了 @ 没写 . 时带 name 去问 path 层', async () => {
    const spy = vi
      .spyOn(api, 'suggestAddress')
      .mockResolvedValue(res('path', ['/home/program/agentmail']));
    const { input } = setup();

    await userEvent.click(input());
    await userEvent.type(input(), 'dsh@/home');

    // 问错层的后果：候选里全是 Agent 名，人以为这个工作区下没有会话
    await waitFor(() => expect(spy).toHaveBeenCalledWith('dsh'));
  });

  it('写了 . 时带 name 与 path 去问 session 层', async () => {
    const spy = vi.spyOn(api, 'suggestAddress').mockResolvedValue(res('session', ['refactor']));
    const { input } = setup();

    await userEvent.click(input());
    await userEvent.type(input(), 'dsh@/home/x.ref');

    await waitFor(() => expect(spy).toHaveBeenCalledWith('dsh', '/home/x'));
  });

  it('path 里的 . 不被当作 session 分隔符（按最后一个 . 切）', async () => {
    const spy = vi.spyOn(api, 'suggestAddress').mockResolvedValue(res('session', ['a']));
    const { input } = setup();

    await userEvent.click(input());
    // path 自身含 .：a.b/proj
    await userEvent.type(input(), 'dsh@/home/a.b/proj.ref');

    await waitFor(() => expect(spy).toHaveBeenCalledWith('dsh', '/home/a.b/proj'));
  });

  it('选中 name 候选后自动补 @', async () => {
    vi.spyOn(api, 'suggestAddress').mockResolvedValue(res('name', ['dsh', 'opencode']));
    const { input, value } = setup();

    await userEvent.click(input());
    await waitFor(() => expect(screen.getByText('dsh')).toBeInTheDocument());
    await userEvent.click(screen.getByText('dsh'));

    // 不补 @ 的话人得自己敲，而这是三段里唯一没有歧义的分隔符
    expect(value()).toBe('dsh@');
  });

  it('选中 path 候选后自动补 .', async () => {
    vi.spyOn(api, 'suggestAddress').mockResolvedValue(res('path', ['/home/program/agentmail']));
    const { input, value } = setup('dsh@');

    await userEvent.click(input());
    await waitFor(() => expect(screen.getByText('/home/program/agentmail')).toBeInTheDocument());
    await userEvent.click(screen.getByText('/home/program/agentmail'));

    expect(value()).toBe('dsh@/home/program/agentmail.');
  });

  it('选中 session 候选后拼出完整地址并关掉下拉', async () => {
    vi.spyOn(api, 'suggestAddress').mockResolvedValue(res('session', ['refactor', 'new']));
    const { input, value } = setup('dsh@/home/x.');

    await userEvent.click(input());
    await waitFor(() => expect(screen.getByText('refactor')).toBeInTheDocument());
    await userEvent.click(screen.getByText('refactor'));

    expect(value()).toBe('dsh@/home/x.refactor');
    // session 是最后一段，选完还开着下拉会挡住下面的输入框
    await waitFor(() => expect(screen.queryByText('会话别名（new 为新建）')).toBeNull());
  });

  it('标题参与过滤，且过滤后标题不错位到别的别名上', async () => {
    // 三条候选，只有第二条的标题含「缓存」
    vi.spyOn(api, 'suggestAddress').mockResolvedValue(
      res(
        'session',
        ['witty-planet', 'brisk-harbor', 'calm-river'],
        [{ title: '重构导入路径' }, { title: '缓存选型讨论' }, { title: '修 CI' }]
      )
    );
    const { input } = setup('dsh@/home/x.');

    await userEvent.click(input());
    await userEvent.type(input(), '缓存');

    await waitFor(() => {
      // 命中的是 brisk-harbor，标题必须还是它自己的
      expect(screen.getByText('brisk-harbor')).toBeInTheDocument();
      expect(screen.getByText('缓存选型讨论')).toBeInTheDocument();
    });
    // 分别过滤两个数组会让 witty-planet 的标题挂到 brisk-harbor 上
    expect(screen.queryByText('重构导入路径')).toBeNull();
    expect(screen.queryByText('witty-planet')).toBeNull();
  });

  it('platform 来源的候选标出「平台」，new 标出「新建会话」', async () => {
    vi.spyOn(api, 'suggestAddress').mockResolvedValue(
      res(
        'session',
        ['ses-mirror', 'new'],
        [
          { title: '平台侧在跑的会话', source: 'platform' },
          { source: 'new' }
        ]
      )
    );
    const { input } = setup('dsh@/home/x.');

    await userEvent.click(input());

    await waitFor(() => {
      // 不标的话人不知道这一封是「接入」一条已在跑的会话
      expect(screen.getByText('平台')).toBeInTheDocument();
      expect(screen.getByText('新建会话')).toBeInTheDocument();
    });
  });

  it('未读数显示在候选上', async () => {
    vi.spyOn(api, 'suggestAddress').mockResolvedValue(
      res('session', ['busy-session'], [{ title: '有新消息', unread: 3 }])
    );
    const { input } = setup('dsh@/home/x.');

    await userEvent.click(input());

    await waitFor(() => expect(screen.getByText('3')).toBeInTheDocument());
  });

  it('键盘上下键移动选中项，Enter 采用', async () => {
    vi.spyOn(api, 'suggestAddress').mockResolvedValue(res('name', ['dsh', 'opencode']));
    const { input, value } = setup();

    await userEvent.click(input());
    await waitFor(() => expect(screen.getByText('opencode')).toBeInTheDocument());

    await userEvent.keyboard('{ArrowDown}{Enter}');

    // 初始 active=0（dsh），下移一格到 opencode
    expect(value()).toBe('opencode@');
  });

  it('Escape 关掉下拉但不清空已输入的内容', async () => {
    vi.spyOn(api, 'suggestAddress').mockResolvedValue(res('name', ['dsh']));
    const { input, value } = setup();

    await userEvent.click(input());
    await userEvent.type(input(), 'ds');
    await waitFor(() => expect(screen.getByText('Agent 名')).toBeInTheDocument());

    await userEvent.keyboard('{Escape}');

    await waitFor(() => expect(screen.queryByText('Agent 名')).toBeNull());
    expect(value()).toBe('ds');
  });

  it('接口失败时静默清空候选，不炸也不弹错', async () => {
    vi.spyOn(api, 'suggestAddress').mockRejectedValue(new Error('network down'));
    const { input, value } = setup();

    await userEvent.click(input());
    await userEvent.type(input(), 'ds');

    // 补全只是便利功能，失败不该阻止人手动输入完整地址
    await waitFor(() => expect(screen.queryByText('Agent 名')).toBeNull());
    expect(value()).toBe('ds');
  });

  it('allowMultiple 时补全只作用于最后一段，前面的地址保留', async () => {
    vi.spyOn(api, 'suggestAddress').mockResolvedValue(res('name', ['opencode']));

    let current = 'dsh@/home/x.a, ';
    const onChange = vi.fn((v: string) => {
      current = v;
    });
    render(
      React.createElement(AddressInput, {
        value: current,
        onChange,
        allowMultiple: true
      })
    );

    await userEvent.click(screen.getByRole('textbox'));
    await waitFor(() => expect(screen.getByText('opencode')).toBeInTheDocument());
    await userEvent.click(screen.getByText('opencode'));

    // 抄送场景：前面已填好的地址不能被补全覆盖
    expect(current).toBe('dsh@/home/x.a, opencode@');
  });
});