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

import {
  emptyDirectThreadChatState,
  mergeDirectHistoryItems,
  reduceDirectThreadEvents,
  resolveDirectThreadBootstrap,
  selectDirectChatEntries,
} from '../src/features/project-workspace/directThreadChat';
import type { DirectThreadEvent } from '../src/features/project-workspace/directThreadEvents';
import type { DirectThreadItem } from '../src/features/project-workspace/directThreadItemProjection';

function event(
  partial: Pick<DirectThreadEvent, 'type'> & Partial<DirectThreadEvent>,
): DirectThreadEvent {
  return partial as DirectThreadEvent;
}

/** app-server `item/started`：工具真正开始执行，itemId 就是归一后的唯一身份。 */
function toolStarted(
  overrides: Partial<
    Extract<DirectThreadItem, { itemType: 'function_call' }>
  > = {},
): DirectThreadItem {
  return {
    itemType: 'function_call',
    itemId: 'call_00_Gpd0s0Ytm9YgIbwbEXva1473',
    name: 'exec_command',
    arguments: '{"cmd": "ls"}',
    at: 1000,
    ...overrides,
  };
}

/** 原始 response item 的输出条目：Rust 已经把它归一成同一个 itemId。 */
function toolOutput(): DirectThreadItem {
  return {
    itemType: 'function_call_output',
    itemId: 'call_00_Gpd0s0Ytm9YgIbwbEXva1473',
    output: 'assets\ngame',
    at: 2000,
  };
}

function messageItem(
  overrides: Partial<Extract<DirectThreadItem, { itemType: 'message' }>> = {},
): DirectThreadItem {
  return {
    itemType: 'message',
    itemId: 'msg-1',
    role: 'assistant',
    text: '你好',
    at: 3000,
    ...overrides,
  };
}

describe('DirectProject 聊天 reducer', () => {
  it('生命周期事件只切换"是否还在跑"，不带回合身份', () => {
    const started = reduceDirectThreadEvents(emptyDirectThreadChatState(), [
      event({ type: 'turn.started' }),
    ]);
    expect(started.turnRunning).toBe(true);

    const completed = reduceDirectThreadEvents(started, [
      event({ type: 'turn.completed', status: 'completed' }),
    ]);
    expect(completed.turnRunning).toBe(false);
  });

  it('bootstrap 事件就是要处理的事件：未完成条目直接进运行态', () => {
    const bootstrapped = resolveDirectThreadBootstrap(
      emptyDirectThreadChatState(),
      {
        subscriptionId: 'sub-1',
        lastCompletedItemId: 'msg-9',
        events: [
          event({ type: 'turn.started' }),
          event({ type: 'item.started', item: toolStarted() }),
        ],
      },
    );
    // 订阅身份与首屏锚点由订阅循环自己持有，不写进聊天 reducer 状态。
    expect(bootstrapped).not.toHaveProperty('subscriptionId');
    expect(bootstrapped).not.toHaveProperty('lastCompletedItemId');
    expect(bootstrapped.turnRunning).toBe(true);
    expect(selectDirectChatEntries(bootstrapped)).toHaveLength(1);
  });

  it('增量正文按条目累计，完成快照更长时覆盖同一段', () => {
    const streamed = reduceDirectThreadEvents(emptyDirectThreadChatState(), [
      event({
        type: 'item.delta',
        itemId: 'msg-1',
        kind: 'message',
        delta: '你',
      }),
      event({
        type: 'item.delta',
        itemId: 'msg-1',
        kind: 'message',
        delta: '好',
      }),
    ]);
    expect(selectDirectChatEntries(streamed)).toHaveLength(1);
    expect(selectDirectChatEntries(streamed)[0]?.text).toBe('你好');

    const done = reduceDirectThreadEvents(streamed, [
      event({
        type: 'item.completed',
        item: messageItem({ text: '你好，我是陶泥儿。' }),
      }),
    ]);
    const entries = selectDirectChatEntries(done);
    expect(entries).toHaveLength(1);
    expect(entries[0]?.text).toBe('你好，我是陶泥儿。');
  });

  it('思考增量按 reasoning 条目累计，不混进助手文本', () => {
    const state = reduceDirectThreadEvents(emptyDirectThreadChatState(), [
      event({
        type: 'item.delta',
        itemId: 'reason-1',
        kind: 'reasoning',
        delta: '先看目录',
      }),
    ]);
    const entries = selectDirectChatEntries(state);
    expect(entries).toHaveLength(1);
    expect(entries[0]?.kind).toBe('reasoning');
    expect(entries[0]?.role).toBeNull();
    expect(entries[0]?.text).toBe('先看目录');
  });

  it('工具调用与输出共用唯一 itemId，归并成一张卡片', () => {
    const state = reduceDirectThreadEvents(emptyDirectThreadChatState(), [
      event({ type: 'item.started', item: toolStarted() }),
      event({ type: 'item.completed', item: toolOutput() }),
    ]);
    const entries = selectDirectChatEntries(state);
    expect(entries).toHaveLength(1);
    expect(entries[0]?.itemId).toBe('call_00_Gpd0s0Ytm9YgIbwbEXva1473');
    expect(entries[0]?.toolCall?.kind).toBe('command');
    expect(entries[0]?.toolCall?.title).toBe('执行命令');
    expect(entries[0]?.toolCall?.detail.command).toBe('{"cmd": "ls"}');
    expect(entries[0]?.toolCall?.detail.output).toBe('assets\ngame');
    expect(entries[0]?.toolCall?.status).toBe('completed');
  });

  it('回合结束把运行态并入历史并清空，条目不会消失也不会重复', () => {
    const running = reduceDirectThreadEvents(emptyDirectThreadChatState(), [
      event({ type: 'turn.started' }),
      event({ type: 'item.completed', item: messageItem() }),
      event({ type: 'item.started', item: toolStarted() }),
    ]);
    expect(running.live).toHaveLength(2);

    const done = reduceDirectThreadEvents(running, [
      event({ type: 'turn.completed', status: 'completed' }),
    ]);
    expect(done.live).toHaveLength(0);
    expect(done.history).toHaveLength(2);
    expect(selectDirectChatEntries(done)).toHaveLength(2);
  });

  it('历史切片搬运层不合并，合并发生在前端投影', () => {
    const state = mergeDirectHistoryItems(emptyDirectThreadChatState(), [
      toolStarted(),
      toolOutput(),
      messageItem({ itemId: 'msg-user', role: 'user', text: '做一个拼图游戏' }),
    ]);
    const entries = selectDirectChatEntries(state);
    expect(entries).toHaveLength(2);
    expect(entries[0]?.toolCall?.detail.output).toBe('assets\ngame');
    expect(entries[1]?.role).toBe('user');
  });

  it('系统条目与未识别的 item 类型不进聊天视图', () => {
    const state = reduceDirectThreadEvents(emptyDirectThreadChatState(), [
      event({
        type: 'item.completed',
        item: messageItem({
          itemId: 'sys-1',
          role: 'system',
          text: '内部指令',
        }),
      }),
      event({
        type: 'item.completed',
        item: {
          itemType: 'other',
          itemId: 'plan-1',
          rawType: 'plan',
          at: 0,
        } satisfies DirectThreadItem,
      }),
    ]);
    expect(selectDirectChatEntries(state)).toHaveLength(0);
  });

  it('历史条目与运行态按唯一 id 合并，重复条目只出现一次', () => {
    const historical = mergeDirectHistoryItems(emptyDirectThreadChatState(), [
      toolStarted(),
      messageItem({ itemId: 'msg-user', role: 'user', text: '做一个拼图游戏' }),
    ]);
    const live = reduceDirectThreadEvents(historical, [
      event({ type: 'item.completed', item: toolOutput() }),
    ]);
    const entries = selectDirectChatEntries(live);
    expect(entries).toHaveLength(2);
    expect(entries[0]?.toolCall?.status).toBe('completed');
    expect(entries[0]?.toolCall?.detail.command).toBe('{"cmd": "ls"}');
  });
});