/**
 * DeepSeekAdapter 多模态（vision 模型）请求格式测试（v0.5.4）
 *
 * 背景：DeepSeek 新增 vision 实验模型 deepseek-v4-flash-vision-exp
 * （OpenAI image_url content parts 格式）。适配器行为：
 * - vision 模型：带 images 的消息 content 转换为 [{type:'text'},{type:'image_url'}] parts
 * - 非 vision 模型：images 静默丢弃（共享层行为，防 API 400）
 *
 * 测试策略（契约级）：mock fetch 记录真实请求体断言。
 */

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

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

import { DeepSeekAdapter } from '../deepseek.adapter';
import type { MetonaRequest, MetonaImageContent } from '../../types';

const mockFetch = vi.fn();
vi.stubGlobal('fetch', mockFetch);

beforeEach(() => {
  mockFetch.mockReset();
});
afterEach(() => {
  mockFetch.mockReset();
});

function makeAdapter(model: string): DeepSeekAdapter {
  return new DeepSeekAdapter({
    provider: 'deepseek',
    baseURL: 'https://api.deepseek.com',
    apiKey: 'sk-test',
    defaultModel: model,
  });
}

function makeRequest(images?: MetonaImageContent[]): MetonaRequest {
  return {
    meta: {
      sessionId: 's',
      iteration: 1,
      requestId: 'r',
      timestamp: Date.now(),
      agentVersion: '1',
    },
    systemPrompt: { roleDefinition: 'sys', outputConstraints: '', safetyGuidelines: '' },
    messages: [{ role: 'user', content: '这张图片里有什么？', images, timestamp: Date.now() }],
    params: { temperature: 0, stream: false, thinkingEnabled: false },
  };
}

function okResponse(): Response {
  return {
    ok: true,
    status: 200,
    json: async () => ({ choices: [{ message: { content: 'ok' } }], usage: {} }),
  } as unknown as Response;
}

// toNativeRequest 返回 Record<string, unknown>；这里收敛为「已知字段 + 任意扩展字段」
// 的交叉类型，测试可直接断言 max_tokens/thinking/temperature/stop/stream 等协议字段。
function requestBody(): { model: string; messages: Array<Record<string, unknown>> } & Record<
  string,
  unknown
> {
  const [, init] = mockFetch.mock.calls[0] as [string, RequestInit];
  return JSON.parse(init.body as string);
}

describe('DeepSeek vision 模型多模态请求格式（v0.5.4）', () => {
  it('vision 模型：带图片的消息转换为 image_url content parts', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send(makeRequest([{ url: 'data:image/jpeg;base64,TESTPIC' }]));

    const body = requestBody();
    expect(body.model).toBe('deepseek-v4-flash-vision-exp');
    // system 消息 + user 消息（含 content parts）
    expect(body.messages).toHaveLength(2);
    const userMsg = body.messages[1];
    expect(userMsg.role).toBe('user');
    expect(Array.isArray(userMsg.content)).toBe(true);
    const parts = userMsg.content as Array<Record<string, unknown>>;
    expect(parts[0]).toEqual({ type: 'text', text: '这张图片里有什么？' });
    expect(parts[1]).toEqual({
      type: 'image_url',
      image_url: { url: 'data:image/jpeg;base64,TESTPIC' },
    });
  });

  it('非 vision 模型：images 被静默丢弃（content 保持纯文本）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-pro');

    await adapter.send(makeRequest([{ url: 'data:image/jpeg;base64,TESTPIC' }]));

    const body = requestBody();
    const userMsg = body.messages[1];
    // 非 vision 模型 content 保持字符串（不转 parts，不发图片 → 不会 400）
    expect(userMsg.content).toBe('这张图片里有什么？');
  });

  it('vision 模型 max_tokens 钳制到 8192（MODEL_INFO 上限）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send({
      ...makeRequest(),
      params: { maxTokens: 63_488, temperature: 0, stream: false },
    } as MetonaRequest);

    const body = JSON.parse((mockFetch.mock.calls[0] as [string, RequestInit])[1].body as string);
    expect(body.max_tokens).toBe(8_192);
  });

  it('vision 模型无图片时不转换（content 保持纯文本）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send(makeRequest(undefined));

    const body = requestBody();
    const userMsg = body.messages[1];
    expect(userMsg.content).toBe('这张图片里有什么？');
  });

  it('vision 模型：多张图片全部转为 image_url parts（保持顺序）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send(
      makeRequest([
        { url: 'data:image/png;base64,AAA' },
        { url: 'data:image/png;base64,BBB' },
        { url: 'data:image/jpeg;base64,CCC' },
      ]),
    );

    const body = requestBody();
    const parts = body.messages[1].content as Array<Record<string, unknown>>;
    expect(parts).toHaveLength(4); // 1 text + 3 image
    expect(parts[1]).toMatchObject({
      type: 'image_url',
      image_url: { url: 'data:image/png;base64,AAA' },
    });
    expect(parts[2]).toMatchObject({
      type: 'image_url',
      image_url: { url: 'data:image/png;base64,BBB' },
    });
    expect(parts[3]).toMatchObject({
      type: 'image_url',
      image_url: { url: 'data:image/jpeg;base64,CCC' },
    });
  });

  it('vision 模型：无文本消息时仍生成 image parts（不丢弃图片）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send({
      ...makeRequest([{ url: 'data:image/png;base64,AAA' }]),
      messages: [
        {
          role: 'user',
          content: null,
          images: [{ url: 'data:image/png;base64,AAA' }],
          timestamp: Date.now(),
        },
      ],
    } as MetonaRequest);

    const body = requestBody();
    const parts = body.messages[1].content as Array<Record<string, unknown>>;
    // 无文本 → 只有 image_url part（text part 不生成）
    expect(parts).toHaveLength(1);
    expect(parts[0].type).toBe('image_url');
  });

  it('非 vision 模型：即使 content 为 null 也不转换图片（纯 null content）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-pro');

    await adapter.send({
      ...makeRequest([{ url: 'data:image/png;base64,AAA' }]),
      messages: [
        {
          role: 'user',
          content: null,
          images: [{ url: 'data:image/png;base64,AAA' }],
          timestamp: Date.now(),
        },
      ],
    } as MetonaRequest);

    const body = requestBody();
    const userMsg = body.messages[1];
    expect(userMsg.content).toBeNull();
  });

  it('vision 模型 detail 字段被丢弃（image_url 仅保留 url）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send(makeRequest([{ url: 'data:image/png;base64,AAA', detail: 'high' }]));

    const body = requestBody();
    const parts = body.messages[1].content as Array<Record<string, unknown>>;
    expect(parts[1]).toEqual({
      type: 'image_url',
      image_url: { url: 'data:image/png;base64,AAA' },
    });
  });

  it('vision 模型 max_tokens 未配置 → 默认 8192（MODEL_INFO 上限）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send({
      ...makeRequest(),
      params: { temperature: 0, stream: false },
    } as MetonaRequest);

    const body = requestBody();
    expect(body.max_tokens).toBe(8_192);
  });

  it('vision 模型 thinking 参数显式映射（thinkingEnabled 兼容）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send({
      ...makeRequest([{ url: 'data:image/png;base64,AAA' }]),
      params: { maxTokens: 4096, temperature: 0, stream: false, thinkingEnabled: true },
    } as MetonaRequest);

    const body = requestBody();
    // vision 模型 supportsThinking=false，但参数仍透传 thinking enabled（引擎决定）
    expect(body.thinking).toEqual({ type: 'enabled' });
  });

  it('vision 模型 messages 数组首位始终为 system 消息', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send(makeRequest([{ url: 'data:image/png;base64,AAA' }]));
    const body = requestBody();
    expect(body.messages[0].role).toBe('system');
    expect(body.messages[0].content as string).toContain('sys');
  });

  it('tool 结果消息不被 images 转换影响（role=tool 保留 tool_call_id）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send({
      ...makeRequest([{ url: 'data:image/png;base64,AAA' }]),
      messages: [
        {
          role: 'user',
          content: '请读图',
          images: [{ url: 'data:image/png;base64,AAA' }],
          timestamp: Date.now(),
        },
        {
          role: 'assistant',
          content: null,
          toolCalls: [
            {
              id: 'tc1',
              name: 'view_image',
              args: { path: 'a.png' },
              iteration: 1,
              timestamp: Date.now(),
            },
          ],
          timestamp: Date.now(),
        },
        {
          role: 'tool',
          content: null,
          toolResult: {
            toolCallId: 'tc1',
            toolName: 'view_image',
            result: { path: 'a.png' },
            success: true,
            durationMs: 1,
            timestamp: Date.now(),
          },
          timestamp: Date.now(),
        },
      ],
    } as MetonaRequest);

    const body = requestBody();
    const toolMsg = body.messages[3];
    expect(toolMsg.role).toBe('tool');
    expect(toolMsg.tool_call_id).toBe('tc1');
    expect(toolMsg.content).toBe('{"path":"a.png"}');
  });

  it('孤立 tool 消息被过滤（无前置 tool_calls）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send({
      ...makeRequest(),
      messages: [
        { role: 'user', content: 'hi', timestamp: Date.now() },
        {
          role: 'tool',
          content: null,
          toolResult: {
            toolCallId: 'tc_orphan',
            toolName: 'x',
            result: 'r',
            success: true,
            durationMs: 1,
            timestamp: Date.now(),
          },
          timestamp: Date.now(),
        },
      ],
    } as MetonaRequest);

    const body = requestBody();
    // system + user，孤立 tool 被剔除
    expect(body.messages).toHaveLength(2);
  });

  it('temperature 与 stop 序列透传', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send({
      ...makeRequest(),
      params: { maxTokens: 4096, temperature: 0.4, stream: false, stopSequences: ['<END>'] },
    } as MetonaRequest);

    const body = requestBody();
    expect(body.temperature).toBe(0.4);
    expect(body.stop).toEqual(['<END>']);
  });

  it('send（非流式路径）强制 stream=false 且不附加 stream_options', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send({
      ...makeRequest([{ url: 'data:image/png;base64,AAA' }]),
      params: { maxTokens: 4096, temperature: 0, stream: true },
    } as MetonaRequest);

    const body = requestBody();
    // send() 契约：无论请求参数如何，非流式路径强制 stream=false，stream_options 仅流式路径注入
    expect(body.stream).toBe(false);
    expect(body.stream_options).toBeUndefined();
  });

  it('非 vision 模型带图片不产生 image_url（content 保持字符串）', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash');

    await adapter.send(makeRequest([{ url: 'data:image/png;base64,AAA' }]));
    const body = requestBody();
    const userMsg = body.messages[1];
    expect(typeof userMsg.content).toBe('string');
    expect(userMsg.content).not.toContain('image_url');
  });

  it('vision 模型 base64 data URI 原样保留在 image_url 中', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    const dataUri = 'data:image/png;base64,' + 'Z'.repeat(50);
    await adapter.send(makeRequest([{ url: dataUri }]));
    const body = requestBody();
    const parts = body.messages[1].content as Array<Record<string, unknown>>;
    expect(parts[1]).toMatchObject({ image_url: { url: dataUri } });
  });

  it('vision 模型 reasoning_content 在 assistant 历史中保留', async () => {
    mockFetch.mockResolvedValue(okResponse());
    const adapter = makeAdapter('deepseek-v4-flash-vision-exp');

    await adapter.send({
      ...makeRequest(),
      messages: [
        { role: 'user', content: 'hi', timestamp: Date.now() },
        { role: 'assistant', content: 'answer', reasoningContent: 'trace', timestamp: Date.now() },
      ],
    } as MetonaRequest);

    const body = requestBody();
    const assistantMsg = body.messages[2] as Record<string, unknown>;
    expect(assistantMsg.reasoning_content).toBe('trace');
  });
});