/**
 * 流式上游错误帧 + 全线截断自愈测试（v0.6.4）
 *
 * 背景（v0.6.3 审计遗留）：
 * 1. 错误帧黑洞 —— OpenAI 兼容网关中途发送的 `{"error":{...}}` 数据帧被解析器
 *    整帧吞掉（零日志），任何上游错误都伪装成"干净的空回复 + 正常 DONE"，
 *    且以普通事件而非异常出现，绕过引擎的重试/故障转移通道。
 * 2. 截断自愈只修了 OpenAI 共享层 —— v0.6.3 的 _truncatedArguments 修复未覆盖：
 *    - Anthropic：content_block_stop 解析失败静默 args={}；断流时未完成块整体蒸发
 *    - Ollama：NDJSON 坏参抛错落入外层 catch，工具调用丢弃且同 chunk USAGE/DONE 被跳过
 *    - 非流式 parseOpenAICompatibleResponse：坏参仍静默 {}
 *    - 引擎兜底缓冲 finalizeToolCallsFromBuffer：坏参静默 {}
 *
 * 本文件锁定以下契约：
 * A. 上游错误帧 → 抛出携带归一化 status 的 SseUpstreamError（可驱动重试判定）
 * B. finish_reason=content_filter → ContentFilterError（终态、不重试）
 * C. data:{无空格} 变体正常解析
 * D. 非流式/Ollama/Anthropic 截断参数统一转 _truncatedArguments 自愈载荷
 * E. Ollama 坏参不再吞掉同 chunk 的 done/USAGE 处理
 * F. Anthropic 断流时未完成 tool_use 块 flush 为自愈调用 + DONE
 */

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 { parseSSEStream, parseOpenAICompatibleResponse, SseUpstreamError } from '../shared/sse-stream';
import { ContentFilterError } from '../base-adapter';
import { OllamaAdapter } from '../ollama.adapter';
import { AnthropicAdapter } from '../anthropic.adapter';
import { MetonaErrorCode, MetonaStreamEventType } from '../../types';
import type { MetonaRequest } from '../../types';

const encoder = new TextEncoder();

function makeStream(lines: string[]): ReadableStream<Uint8Array> {
  const payload = lines.join('\n') + '\n';
  return new ReadableStream<Uint8Array>({
    start(controller) {
      controller.enqueue(encoder.encode(payload));
      controller.close();
    },
  });
}

async function collectExpectingThrow(stream: ReadableStream<Uint8Array>): Promise<unknown> {
  try {
    for await (const _ev of parseSSEStream(stream, 'r_test', 's_test', 1)) {
      void _ev;
    }
  } catch (err) {
    return err;
  }
  throw new Error('expected parseSSEStream to throw but it completed normally');
}

function sseData(json: unknown): string {
  return `data: ${JSON.stringify(json)}`;
}

// ===== A. 上游错误帧 → 抛出结构化异常 =====

describe('parseSSEStream — 上游错误帧（v0.6.4 错误帧黑洞根治）', () => {
  it('顶层 error 帧（含数值 status）→ 抛出携带该 status 的 SseUpstreamError', async () => {
    const err = await collectExpectingThrow(
      makeStream([sseData({ error: { message: 'Gateway timeout', status: 504 } })]),
    );
    expect(err).toBeInstanceOf(SseUpstreamError);
    expect((err as SseUpstreamError).status).toBe(504);
    expect((err as Error).message).toContain('Gateway timeout');
  });

  it('choices[0].error 变体包装也能检出', async () => {
    const err = await collectExpectingThrow(
      makeStream([
        sseData({
          choices: [{ error: { message: 'bad gateway', code: 'upstream_failure', status: 502 } }],
        }),
      ]),
    );
    expect(err).toBeInstanceOf(SseUpstreamError);
    expect((err as SseUpstreamError).status).toBe(502);
  });

  it('字符串型顶层 error 也能检出', async () => {
    const err = await collectExpectingThrow(makeStream(['data: {"error":"service unavailable"}']));
    expect(err).toBeInstanceOf(SseUpstreamError);
    expect((err as Error).message).toContain('service unavailable');
  });

  it('providerCode 归一化：rate_limit_exceeded 无数值 status → 映射 429（可重试）', async () => {
    const err = await collectExpectingThrow(
      makeStream([
        sseData({ error: { code: 'rate_limit_exceeded', message: 'too many requests' } }),
      ]),
    );
    expect(err).toBeInstanceOf(SseUpstreamError);
    expect((err as SseUpstreamError).status).toBe(429);
    expect((err as SseUpstreamError).providerCode).toBe('rate_limit_exceeded');
  });

  it('insufficient_quota → 402；invalid_api_key → 401（不可重试区间）', async () => {
    const e1 = await collectExpectingThrow(
      makeStream([sseData({ error: { code: 'insufficient_quota', message: 'quota exceeded' } })]),
    );
    expect((e1 as SseUpstreamError).status).toBe(402);

    const e2 = await collectExpectingThrow(
      makeStream([
        sseData({ error: { code: 'invalid_api_key', message: 'Incorrect API key provided' } }),
      ]),
    );
    expect((e2 as SseUpstreamError).status).toBe(401);
  });

  it('含 content_filter 码的错误帧 → ContentFilterError（复用专用类型）', async () => {
    const err = await collectExpectingThrow(
      makeStream([
        sseData({ error: { code: 'content_filter', message: 'rejected by safety policy' } }),
      ]),
    );
    expect(err).toBeInstanceOf(ContentFilterError);
  });

  it('isRetryable 契约对齐：错误带 status 时，engine.isRetryableError 的 429/5xx 判定可直接命中', async () => {
    // 用与引擎 isRetryableError 相同的判定逻辑验证字段形态
    const isRetryableShape = (err: unknown): boolean => {
      const e = err as { status?: number; message?: string };
      if (e.status === 429) return true;
      if (e.status && e.status >= 500 && e.status < 600) return true;
      return false;
    };
    const rateLimited = await collectExpectingThrow(
      makeStream([sseData({ error: { code: 'rate_limit_exceeded', message: 'rl' } })]),
    );
    expect(isRetryableShape(rateLimited)).toBe(true);
    const authFail = await collectExpectingThrow(
      makeStream([sseData({ error: { code: 'invalid_api_key', message: 'auth' } })]),
    );
    expect(isRetryableShape(authFail)).toBe(false);
  });

  it('正常数据帧不含 error 字段时不受影响（回归）', async () => {
    // choices[0] 中存在 delta 但无 error → 正常产出文本增量并 DONE 收尾
    const events: string[] = [];
    const stream = makeStream([
      sseData({ choices: [{ delta: { content: 'hello' } }] }),
      'data: [DONE]',
    ]);
    for await (const ev of parseSSEStream(stream, 'r', 's', 1)) {
      events.push(ev.type);
    }
    expect(events).toContain(MetonaStreamEventType.TEXT_DELTA);
    expect(events[events.length - 1]).toBe(MetonaStreamEventType.DONE);
  });
});

// ===== B/C. content_filter 终止映射 + 无空格 data 变体 =====

describe('parseSSEStream — content_filter 与行格式兼容', () => {
  it('finish_reason=content_filter → 抛出 ContentFilterError（不再当普通结束）', async () => {
    const err = await collectExpectingThrow(
      makeStream([sseData({ choices: [{ delta: {}, finish_reason: 'content_filter' }] })]),
    );
    expect(err).toBeInstanceOf(ContentFilterError);
  });

  it('data:{}（无空格）变体被正常解析（此前整帧跳过）', async () => {
    const events: Array<{ type: string }> = [];
    const stream = new ReadableStream<Uint8Array>({
      start(controller) {
        controller.enqueue(encoder.encode('data:{"choices":[{"delta":{"content":"hi"}}]}\n'));
        controller.enqueue(encoder.encode('data:[DONE]\n'));
        controller.close();
      },
    });
    for await (const ev of parseSSEStream(stream, 'r', 's', 1)) {
      events.push({ type: ev.type });
    }
    expect(events.some((e) => e.type === MetonaStreamEventType.TEXT_DELTA)).toBe(true);
    expect(events[events.length - 1].type).toBe(MetonaStreamEventType.DONE);
  });
});

// ===== D. 非流式截断自愈同步 =====

describe('parseOpenAICompatibleResponse — 非流式截断自愈（v0.6.4 同步）', () => {
  it('坏 JSON arguments 不再静默 {}，转为 _truncatedArguments 载荷', () => {
    const result = parseOpenAICompatibleResponse({
      choices: [
        {
          message: {
            role: 'assistant',
            content: null,
            tool_calls: [
              {
                id: 'call_1',
                function: { name: 'write_file', arguments: '{"file_path": "a.html", "con' },
              },
            ],
          },
          finish_reason: 'tool_calls',
        },
      ],
      usage: { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
    });

    expect(result.toolCalls).toHaveLength(1);
    const args = result.toolCalls![0].args as Record<string, unknown>;
    expect(args._truncatedArguments).toBe(true);
    expect(String(args._truncatedReason)).toContain('truncated');
  });

  it('合法对象型 arguments 保持原样（回归）', () => {
    const result = parseOpenAICompatibleResponse({
      choices: [
        {
          message: {
            role: 'assistant',
            tool_calls: [{ id: 'c1', function: { name: 'think', arguments: '{"a":1}' } }],
          },
          finish_reason: 'tool_calls',
        },
      ],
    });
    expect(result.toolCalls![0].args).toEqual({ a: 1 });
  });
});

// ===== E/F. Ollama NDJSON 与 Anthropic 事件机 =====

/** 构造全局 fetch mock：返回给定行的 NDJSON/SSE 流 */
function mockFetchWithLines(lines: string[]): ReturnType<typeof vi.fn> {
  const payload = encoder.encode(lines.join('\n') + '\n');
  const body = new ReadableStream<Uint8Array>({
    start(controller) {
      controller.enqueue(payload);
      controller.close();
    },
  });
  const fetchMock = vi.fn().mockResolvedValue(
    new Response(body, {
      status: 200,
      headers: { 'Content-Type': 'application/x-ndjson' },
    }),
  );
  vi.stubGlobal('fetch', fetchMock);
  return fetchMock;
}

const baseRequest: MetonaRequest = {
  meta: { sessionId: 's1', iteration: 1, requestId: 'r1', timestamp: Date.now(), agentVersion: 'test' },
  systemPrompt: { roleDefinition: 'rd', outputConstraints: '', safetyGuidelines: '' },
  messages: [{ role: 'user', content: 'hi', timestamp: Date.now() }],
  params: { maxTokens: 4096, temperature: 0, stream: true },
};

describe('OllamaAdapter.sendStream — NDJSON 截断自愈（v0.6.4）', () => {
  it('坏 JSON arguments → _truncatedArguments 工具调用，且后续 done chunk 的 USAGE/DONE 不再被吞掉', async () => {
    const adapter = new OllamaAdapter({
      provider: 'ollama',
      baseURL: 'http://localhost:11434',
      defaultModel: 'qwen3',
    });
    mockFetchWithLines([
      JSON.stringify({
        model: 'qwen3',
        message: {
          role: 'assistant',
          content: '',
          tool_calls: [{ function: { name: 'write_file', arguments: '{"path": "a.txt", "cont' } }],
        },
      }),
      // 关键：同一响应流中随后仍有收尾 chunk（原实现外层 catch 会跳过这些处理）
      JSON.stringify({
        model: 'qwen3',
        message: { role: 'assistant', content: '' },
        done: true,
        done_reason: 'stop',
        prompt_eval_count: 11,
        eval_count: 7,
      }),
    ]);

    const events: string[] = [];
    let usageInputTokens = -1;
    for await (const ev of adapter.sendStream(baseRequest)) {
      events.push(ev.type);
      if (ev.type === MetonaStreamEventType.USAGE) usageInputTokens = ev.usage!.inputTokens ?? 0;
    }

    // 流不再被坏参打断：usage 与 done 都到达
    expect(usageInputTokens).toBe(11);
    expect(events[events.length - 1]).toBe(MetonaStreamEventType.DONE);
  });

  it('自愈载荷内容正确（_truncatedArguments=true + reason 含 truncated）', async () => {
    const adapter = new OllamaAdapter({
      provider: 'ollama',
      baseURL: 'http://localhost:11434',
      defaultModel: 'qwen3',
    });
    mockFetchWithLines([
      JSON.stringify({
        model: 'm',
        message: {
          role: 'assistant',
          tool_calls: [{ function: { name: 'read_file', arguments: '{"file_path": "b.t' } }],
        },
        done: false,
      }),
      JSON.stringify({ model: 'm', message: { role: 'assistant', content: '' }, done: true }),
    ]);

    let completeArgs: Record<string, unknown> | undefined;
    for await (const ev of adapter.sendStream(baseRequest)) {
      if (ev.type === MetonaStreamEventType.TOOL_CALL_COMPLETE) {
        completeArgs = ev.toolCall!.args as Record<string, unknown>;
      }
    }
    expect(completeArgs).toBeDefined();
    expect(completeArgs!._truncatedArguments).toBe(true);
    expect(String(completeArgs!._truncatedReason)).toContain('truncated');
  });
});

describe('AnthropicAdapter.sendStream — 事件机截断自愈 + 断流 flush（v0.6.4）', () => {
  it('缺口 A：content_block_stop 时坏 JSON → _truncatedArguments（不再静默 {}）', async () => {
    const adapter = new AnthropicAdapter({
      provider: 'anthropic',
      baseURL: 'http://anthropic.test',
      apiKey: 'sk-test',
      defaultModel: 'claude-sonnet-4-5',
    });
    mockFetchWithLines([
      'event: content_block_start',
      sseData({
        type: 'content_block_start',
        index: 0,
        content_block: { type: 'tool_use', id: 'toolu_1', name: 'write_file' },
      }),
      'event: content_block_delta',
      sseData({
        type: 'content_block_delta',
        index: 0,
        delta: { type: 'input_json_delta', partial_json: '{"file_path": "a.html", "con' },
      }),
      'event: content_block_stop',
      sseData({ type: 'content_block_stop', index: 0 }),
      'event: message_stop',
      sseData({ type: 'message_stop' }),
    ]);

    let completeArgs: Record<string, unknown> | undefined;
    let completeId: string | undefined;
    for await (const ev of adapter.sendStream(baseRequest)) {
      if (ev.type === MetonaStreamEventType.TOOL_CALL_COMPLETE) {
        completeArgs = ev.toolCall!.args as Record<string, unknown>;
        completeId = ev.toolCall!.id;
      }
    }
    expect(completeArgs).toBeDefined();
    expect(completeArgs!._truncatedArguments).toBe(true);
    // 保留上游原始 block id（非 nanoid 重造）
    expect(completeId).toBe('toolu_1');
  });

  it('缺口 B：断流未完成 tool_use 块 → flush 为自愈调用 + 补发 DONE（不再整体蒸发）', async () => {
    const adapter = new AnthropicAdapter({
      provider: 'anthropic',
      baseURL: 'http://anthropic.test',
      apiKey: 'sk-test',
      defaultModel: 'claude-sonnet-4-5',
    });
    // 有 content_block_start，但流在 content_block_stop/message_stop 之前断开
    const payload =
      'event: message_start\ndata: {"type":"message_start","message":{"role":"assistant","usage":{"input_tokens":42}}}\n\n' +
      'event: content_block_start\ndata: {"type":"content_block_start","index":0,"content_block":{"type":"tool_use","id":"toolu_X","name":"edit_file"}}\n\n' +
      'event: content_block_delta\ndata: {"type":"content_block_delta","index":0,"delta":{"type":"input_json_delta","partial_json":"{\\"pa"}}\n\n';
    const body = new ReadableStream<Uint8Array>({
      start(controller) {
        controller.enqueue(encoder.encode(payload));
        controller.close();
      },
    });
    vi.stubGlobal(
      'fetch',
      vi.fn().mockResolvedValue(new Response(body, { status: 200 })),
    );

    const events: Array<{ type: string; toolCallId?: string; toolCallName?: string }> = [];
    for await (const ev of adapter.sendStream(baseRequest)) {
      events.push({
        type: ev.type,
        toolCallId: ev.toolCall?.id,
        toolCallName: ev.toolCall?.name,
      });
    }

    const complete = events.find((e) => e.type === MetonaStreamEventType.TOOL_CALL_COMPLETE);
    // 核心契约：断流前缓冲中的 block 必须以 TOOL_CALL_COMPLETE 产出（引擎才不会误判空回复完成）
    expect(complete).toBeDefined();
    expect(complete!.toolCallId).toBe('toolu_X');
    expect(complete!.toolCallName).toBe('edit_file');
    expect(events[events.length - 1].type).toBe(MetonaStreamEventType.DONE);
  });

  it('error 事件 → 抛出携带归一化 status 的异常（overloaded → 529 可重试语义）', async () => {
    const adapter = new AnthropicAdapter({
      provider: 'anthropic',
      baseURL: 'http://anthropic.test',
      apiKey: 'sk-test',
      defaultModel: 'claude-sonnet-4-5',
    });
    mockFetchWithLines([
      'event: error',
      sseData({ type: 'error', error: { type: 'overloaded_error', message: 'Overloaded' } }),
    ]);

    let caught: unknown;
    try {
      for await (const _ev of adapter.sendStream(baseRequest)) {
        void _ev;
      }
    } catch (err) {
      caught = err;
    }
    expect(caught).toBeDefined();
    expect((caught as Error & { status?: number }).status).toBe(529);
    expect((caught as Error).message).toContain('Overloaded');
  });
});

// ===== G. 引擎侧 ERROR 事件保留结构化码 =====

describe('MetonaErrorCode — CONTENT_FILTERED 枚举契约（finish 映射依赖）', () => {
  it('code 值稳定为 content_filtered', () => {
    expect(MetonaErrorCode.CONTENT_FILTERED).toBe('content_filtered');
  });
});

// ===== H. 引擎集成：错误帧异常进入重试/故障转移通道；ERROR 码映射 CONTENT_FILTERED =====

import { AgentLoopEngine } from '../../agent-loop/engine';
import { TerminationReason } from '../../agent-loop/types';
import type { IMetonaProviderAdapter, MetonaResponse, MetonaStreamEvent } from '../../types';

function textDone(text: string): MetonaStreamEvent[] {
  return [
    { type: MetonaStreamEventType.TEXT_DELTA, requestId: 'r1', sessionId: 's1', iteration: 1, seq: 0, timestamp: Date.now(), delta: text },
    { type: MetonaStreamEventType.DONE, requestId: 'r1', sessionId: 's1', iteration: 1, seq: 1, timestamp: Date.now() },
  ];
}

describe('AgentLoopEngine 集成 — v0.6.4 错误通道单轨化', () => {
  const userMessage = { role: 'user' as const, content: 'hi', timestamp: Date.now() };
  const systemPrompt = { roleDefinition: '', outputConstraints: '', safetyGuidelines: '' };

  function scriptedAdapter(
    behaviors: Array<{ throws?: Error; events?: MetonaStreamEvent[] }>,
  ): { adapter: IMetonaProviderAdapter; calls: () => number } {
    let call = 0;
    const base: IMetonaProviderAdapter = {
      providerId: 'mock',
      supportedModels: ['m'],
      supportsToolCalling: true,
      supportsThinking: false,
      getContextWindow: () => 1_000_000,
      send: async (): Promise<MetonaResponse> => ({
        meta: { requestId: 'r', provider: 'mock', model: 'm', latencyMs: 0, timestamp: Date.now() },
        content: '',
        usage: { inputTokens: 1, outputTokens: 1, totalTokens: 2 },
        finishReason: 'stop' as never,
      }),
      sendStream: async function* (): AsyncIterable<MetonaStreamEvent> {
        const b = behaviors[Math.min(call, behaviors.length - 1)];
        call++;
        if (b.throws) throw b.throws;
        for (const ev of b.events ?? []) yield ev;
      },
      setAbortSignal: vi.fn(),
      healthCheck: async () => true,
    };
    return { adapter: base, calls: () => call };
  }

  it('SseUpstreamError(429) 首次失败 → 引擎指数退避重试后成功（不再落入 UNKNOWN 终态）', async () => {
    vi.useFakeTimers();
    try {
      const { adapter } = scriptedAdapter([
        { throws: new SseUpstreamError('rate limited', { status: 429 }) },
        { events: textDone('recovered answer') },
      ]);
      const engine = new AgentLoopEngine({ retryCount: 3 }, adapter);
      // 推进退避定时器（1s/2s/4s + jitter 上限）
      const runPromise = engine.runStream(userMessage, 's1', [], systemPrompt);
      await vi.advanceTimersByTimeAsync(10_000);
      const output = await runPromise;
      expect(output.terminationReason).toBe(TerminationReason.COMPLETED);
      expect(output.finalAnswer).toBe('recovered answer');
    } finally {
      vi.useRealTimers();
    }
  });

  it('引擎收到的流内 ERROR 带 code=content_filtered → finish 发出 CONTENT_FILTERED 错误事件', async () => {
    const { adapter } = scriptedAdapter([
      {
        events: [
          {
            type: MetonaStreamEventType.ERROR,
            requestId: 'r1',
            sessionId: 's1',
            iteration: 1,
            seq: 0,
            timestamp: Date.now(),
            error: {
              code: MetonaErrorCode.CONTENT_FILTERED,
              message: '内容被安全审核拦截',
              retryable: false,
            },
          },
          { type: MetonaStreamEventType.DONE, requestId: 'r1', sessionId: 's1', iteration: 1, seq: 1, timestamp: Date.now() },
        ],
      },
    ]);
    const engine = new AgentLoopEngine({ retryCount: 0 }, adapter);
    const errorEvents: Array<{ code?: string; message?: string }> = [];
    engine.on('streamEvent', (ev: MetonaStreamEvent) => {
      if (ev.type === MetonaStreamEventType.ERROR) {
        errorEvents.push({ code: ev.error?.code, message: ev.error?.message });
      }
    });
    const output = await engine.runStream(userMessage, 's1', [], systemPrompt);
    expect(output.terminationReason).toBe(TerminationReason.ERROR);
    expect(errorEvents[errorEvents.length - 1]?.code).toBe(MetonaErrorCode.CONTENT_FILTERED);
  });
});