import { describe, expect, it } from 'vitest';
import {
  chatResponseToResponses,
  responsesRequestToChat,
  ResponsesSseTranslator,
  type BridgeSseEvent,
  type ResponsesCreateParams,
} from './chatBridgeTranslate';

function sseLines(events: Array<Record<string, unknown>>): string {
  return events.map((data) => `data: ${JSON.stringify(data)}\n\n`).join('');
}

function types(events: BridgeSseEvent[]): string[] {
  return events.map((item) => item.event);
}

describe('responsesRequestToChat', () => {
  it('instructions 转 developer message，input 字符串转 user message', () => {
    const chat = responsesRequestToChat({ model: 'qwen', instructions: '你是助手', input: '你好' });
    expect(chat.model).toBe('qwen');
    expect(chat.messages).toEqual([
      { role: 'developer', content: '你是助手' },
      { role: 'user', content: '你好' },
    ]);
  });

  it('message item：字符串 content 直传；easy-input-message（无 type）按 message 处理', () => {
    const chat = responsesRequestToChat({
      input: [
        { type: 'message', role: 'user', content: '直接字符串' },
        { role: 'assistant', content: '没有 type 字段' },
      ],
    });
    expect(chat.messages).toEqual([
      { role: 'user', content: '直接字符串' },
      { role: 'assistant', content: '没有 type 字段' },
    ]);
  });

  it('content parts：input_text 合并；单文本压成 string；input_file 丢弃并留诊断', () => {
    const dropped: string[] = [];
    const chat = responsesRequestToChat(
      {
        input: [
          {
            type: 'message',
            role: 'user',
            content: [
              { type: 'input_text', text: '第一段' },
              { type: 'input_file', file_url: 'file:///x.pdf' },
              { type: 'input_text', text: '第二段' },
            ],
          },
          {
            type: 'message',
            role: 'user',
            content: [{ type: 'input_text', text: '唯一文本' }],
          },
        ],
      },
      (line) => dropped.push(line),
    );
    expect(chat.messages[0]).toEqual({
      role: 'user',
      content: [
        { type: 'text', text: '第一段' },
        { type: 'text', text: '第二段' },
      ],
    });
    expect(chat.messages[1]).toEqual({ role: 'user', content: '唯一文本' });
    expect(dropped.some((line) => line.includes('input_file'))).toBe(true);
  });

  it('function_call / function_call_output / reasoning 的映射与丢弃', () => {
    const dropped: string[] = [];
    const chat = responsesRequestToChat(
      {
        input: [
          { type: 'reasoning', summary: [] },
          { type: 'function_call', call_id: 'call_1', name: 'exec', arguments: '{"cmd":"ls"}' },
          { type: 'function_call_output', call_id: 'call_1', output: 'ok' },
        ],
      },
      (line) => dropped.push(line),
    );
    expect(chat.messages).toEqual([
      {
        role: 'assistant',
        content: null,
        tool_calls: [{ id: 'call_1', type: 'function', function: { name: 'exec', arguments: '{"cmd":"ls"}' } }],
      },
      { role: 'tool', tool_call_id: 'call_1', content: 'ok' },
    ]);
    expect(dropped.some((line) => line.includes('reasoning'))).toBe(true);
  });

  it('tools 扁平转嵌套；tool_choice 各形态；max_output_tokens 转 max_tokens', () => {
    const chat = responsesRequestToChat({
      input: 'x',
      tools: [
        { type: 'function', name: 'exec', description: '执行', parameters: { type: 'object' } },
        { type: 'web_search' },
      ],
      tool_choice: { type: 'function', name: 'exec' },
      max_output_tokens: 1024,
      temperature: 0.3,
      top_p: 0.9,
      parallel_tool_calls: false,
    });
    expect(chat.tools).toEqual([
      { type: 'function', function: { name: 'exec', description: '执行', parameters: { type: 'object' } } },
    ]);
    expect(chat.tool_choice).toEqual({ type: 'function', function: { name: 'exec' } });
    expect(chat.max_tokens).toBe(1024);
    expect(chat.temperature).toBe(0.3);
    expect(chat.top_p).toBe(0.9);
    expect(chat.parallel_tool_calls).toBe(false);
  });

  it('tool_choice 字符串直传；无法识别的形态丢弃', () => {
    expect(responsesRequestToChat({ input: 'x', tool_choice: 'required' }).tool_choice).toBe('required');
    expect(
      responsesRequestToChat({ input: 'x', tool_choice: { type: 'allowed_tools', tools: [] } }).tool_choice,
    ).toBeUndefined();
  });

  it('stream 时补 stream_options.include_usage；responses 专有字段不外泄', () => {
    const chat = responsesRequestToChat({
      input: 'x',
      stream: true,
      previous_response_id: 'resp_x',
      store: false,
      metadata: { a: 1 },
      reasoning: { effort: 'high' },
      include: ['reasoning.encrypted_content'],
      truncation: 'auto',
    });
    expect(chat.stream).toBe(true);
    expect(chat.stream_options).toEqual({ include_usage: true });
    const raw = JSON.stringify(chat);
    // 注意要用带冒号的键名匹配：裸 'include' 会误伤 stream_options 的 include_usage
    for (const key of ['previous_response_id', 'store', 'metadata', 'reasoning', 'include', 'truncation']) {
      expect(raw).not.toContain(`"${key}":`);
    }
  });
});

describe('chatResponseToResponses', () => {
  const req: ResponsesCreateParams = { model: 'qwen', input: 'x' };

  it('content / tool_calls / reasoning_content / usage 全量映射', () => {
    const response = chatResponseToResponses(
      {
        id: 'chatcmpl-1',
        created: 1700000000,
        model: 'qwen',
        choices: [
          {
            finish_reason: 'tool_calls',
            message: {
              reasoning_content: '想一想',
              content: '好的',
              tool_calls: [{ id: 'call_1', type: 'function', function: { name: 'exec', arguments: '{}' } }],
            },
          },
        ],
        usage: { prompt_tokens: 10, completion_tokens: 20, total_tokens: 30 },
      },
      req,
    );
    expect(response).toMatchObject({
      id: 'chatcmpl-1',
      object: 'response',
      created_at: 1700000000,
      model: 'qwen',
      status: 'completed',
      usage: { input_tokens: 10, output_tokens: 20, total_tokens: 30 },
    });
    const output = response.output as Array<Record<string, unknown>>;
    expect(output.map((item) => item.type)).toEqual(['reasoning', 'message', 'function_call']);
    expect(output[1]).toMatchObject({
      role: 'assistant',
      status: 'completed',
      content: [{ type: 'output_text', text: '好的' }],
    });
    expect(output[2]).toMatchObject({ call_id: 'call_1', name: 'exec', arguments: '{}' });
  });

  it('finish_reason=length 判 incomplete；无 usage 填全零', () => {
    const response = chatResponseToResponses(
      { choices: [{ finish_reason: 'length', message: { content: '截断' } }] },
      req,
    );
    expect(response.status).toBe('incomplete');
    expect(response.incomplete_details).toEqual({ reason: 'max_output_tokens' });
    expect(response.usage).toEqual({ input_tokens: 0, output_tokens: 0, total_tokens: 0 });
  });
});

describe('ResponsesSseTranslator', () => {
  const req: ResponsesCreateParams = { model: 'qwen', input: 'x', stream: true };

  it('纯文本流：完整 golden 事件序列', () => {
    const translator = new ResponsesSseTranslator(req);
    const events = translator.push(
      sseLines([
        { choices: [{ delta: { role: 'assistant', content: '' }, finish_reason: null }] },
        { choices: [{ delta: { content: '你好' }, finish_reason: null }] },
        { choices: [{ delta: { content: '，世界' }, finish_reason: null }] },
        { choices: [{ delta: {}, finish_reason: 'stop' }], usage: { prompt_tokens: 3, completion_tokens: 2, total_tokens: 5 } },
      ]) + 'data: [DONE]\n\n',
    );
    expect(types(events)).toEqual([
      'response.created',
      'response.in_progress',
      'response.output_item.added',
      'response.content_part.added',
      'response.output_text.delta',
      'response.output_text.delta',
      'response.output_text.done',
      'response.content_part.done',
      'response.output_item.done',
      'response.completed',
    ]);
    const completed = events.at(-1)?.data.response as Record<string, unknown>;
    expect(completed.status).toBe('completed');
    expect(completed.usage).toEqual({ input_tokens: 3, output_tokens: 2, total_tokens: 5 });
    const output = completed.output as Array<Record<string, unknown>>;
    expect(output).toHaveLength(1);
    expect((output[0].content as Array<{ text: string }>)[0].text).toBe('你好，世界');
  });

  it('data: 行跨分包拼接', () => {
    const translator = new ResponsesSseTranslator(req);
    const chunk = `data: ${JSON.stringify({ choices: [{ delta: { content: '整段' } }] })}`;
    const half = Math.floor(chunk.length / 2);
    const first = translator.push(chunk.slice(0, half));
    const second = translator.push(chunk.slice(half) + '\n\ndata: [DONE]\n\n');
    expect(types([...first, ...second])).toEqual([
      'response.created',
      'response.in_progress',
      'response.output_item.added',
      'response.content_part.added',
      'response.output_text.delta',
      'response.output_text.done',
      'response.content_part.done',
      'response.output_item.done',
      'response.completed',
    ]);
  });

  it('两个并行 tool_calls 按 index 交错也能分别归拢', () => {
    const translator = new ResponsesSseTranslator(req);
    const events = translator.push(
      sseLines([
        {
          choices: [
            {
              delta: {
                tool_calls: [
                  { index: 0, id: 'call_a', function: { name: 'exec', arguments: '{"a":' } },
                  { index: 1, id: 'call_b', function: { name: 'read', arguments: '{"b":' } },
                ],
              },
            },
          ],
        },
        {
          choices: [
            {
              delta: {
                tool_calls: [
                  { index: 1, function: { arguments: '1}' } },
                  { index: 0, function: { arguments: '2}' } },
                ],
              },
              finish_reason: 'tool_calls',
            },
          ],
        },
      ]) + 'data: [DONE]\n\n',
    );
    expect(types(events)).toEqual([
      'response.created',
      'response.in_progress',
      'response.output_item.added',
      'response.function_call_arguments.delta',
      'response.output_item.added',
      'response.function_call_arguments.delta',
      'response.function_call_arguments.delta',
      'response.function_call_arguments.delta',
      'response.function_call_arguments.done',
      'response.output_item.done',
      'response.function_call_arguments.done',
      'response.output_item.done',
      'response.completed',
    ]);
    const completed = events.at(-1)?.data.response as Record<string, unknown>;
    const output = completed.output as Array<Record<string, unknown>>;
    expect(output.map((item) => [item.call_id, item.name, item.arguments])).toEqual([
      ['call_a', 'exec', '{"a":2}'],
      ['call_b', 'read', '{"b":1}'],
    ]);
  });

  it('reasoning_content 流转 reasoning item，正文开始前闭合', () => {
    const translator = new ResponsesSseTranslator(req);
    const events = translator.push(
      sseLines([
        { choices: [{ delta: { reasoning_content: '先想' } }] },
        { choices: [{ delta: { reasoning_content: '一下' } }] },
        { choices: [{ delta: { content: '结论' } }] },
        { choices: [{ delta: {}, finish_reason: 'stop' }] },
      ]) + 'data: [DONE]\n\n',
    );
    expect(types(events)).toEqual([
      'response.created',
      'response.in_progress',
      'response.output_item.added',
      'response.reasoning_summary_part.added',
      'response.reasoning_summary_text.delta',
      'response.reasoning_summary_text.delta',
      'response.reasoning_summary_text.done',
      'response.reasoning_summary_part.done',
      'response.output_item.done',
      'response.output_item.added',
      'response.content_part.added',
      'response.output_text.delta',
      'response.output_text.done',
      'response.content_part.done',
      'response.output_item.done',
      'response.completed',
    ]);
    const completed = events.at(-1)?.data.response as Record<string, unknown>;
    const output = completed.output as Array<Record<string, unknown>>;
    expect(output[0]).toMatchObject({ type: 'reasoning', summary: [{ type: 'summary_text', text: '先想一下' }] });
  });

  it('上游没发 [DONE]：finish() 冲刷闭合；无 usage 填全零', () => {
    const translator = new ResponsesSseTranslator(req);
    translator.push(sseLines([{ choices: [{ delta: { content: '半截' } }] }]));
    const events = translator.finish();
    expect(types(events)).toEqual([
      'response.output_text.done',
      'response.content_part.done',
      'response.output_item.done',
      'response.completed',
    ]);
    const completed = events.at(-1)?.data.response as Record<string, unknown>;
    expect(completed.usage).toEqual({ input_tokens: 0, output_tokens: 0, total_tokens: 0 });
    // 再次 finish / push 不再重复发 completed
    expect(translator.finish()).toEqual([]);
  });

  it('坏 JSON 行跳过不杀流；usage-only chunk 不产事件', () => {
    const dropped: string[] = [];
    const translator = new ResponsesSseTranslator(req, (line) => dropped.push(line));
    const events = translator.push(
      'data: {bad json\n\n' +
        sseLines([{ usage: { prompt_tokens: 1, completion_tokens: 1, total_tokens: 2 } }]) +
        sseLines([{ choices: [{ delta: { content: '好' }, finish_reason: 'stop' }] }]) +
        'data: [DONE]\n\n',
    );
    expect(dropped.some((line) => line.includes('无法解析'))).toBe(true);
    const completed = events.at(-1)?.data.response as Record<string, unknown>;
    expect(completed.usage).toEqual({ input_tokens: 1, output_tokens: 1, total_tokens: 2 });
  });

  it('fail() 补 response.failed 并带错误信息', () => {
    const translator = new ResponsesSseTranslator(req);
    translator.push(sseLines([{ choices: [{ delta: { content: '写了一半' } }] }]));
    const events = translator.fail('上游连接中断');
    expect(types(events)).toEqual(['response.failed']);
    const response = events[0].data.response as Record<string, unknown>;
    expect(response.status).toBe('failed');
    expect(response.error).toMatchObject({ code: 'upstream_error', message: '上游连接中断' });
    expect(translator.finish()).toEqual([]);
  });
});