/**
 * AgentLoopEngine 可靠性扩展测试（v0.7.0 覆盖补齐）
 *
 * 覆盖此前完全未测的引擎核心分支：
 * 1. 上下文压缩管线 —— 阈值触发、#30 摘要注入形态（assistant 角色 + 占位 user）、
 *    compressed 事件载荷、负向回归。
 * 2. 重试/退避 —— 503×2 后第三次成功；RETRY 伪 ERROR 不透传前端。
 * 3. abort 竞速 —— 工具执行中 abort → USER_INTERRUPT；迟到工具结果不转发；
 *    waitForAbort 超时 false / 完成 true 双路径（#29）。
 * 4. H-5 引擎层 MEMORY.md 根文件闸门 —— 参数别名矩阵与子目录放行。
 * 5. finalizeToolCallsFromBuffer 兜底缓冲 —— 合法拼接与截断自愈分支。
 */

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 { AgentLoopEngine } from '../engine';
import { TerminationReason } from '../types';
import type {
  IMetonaProviderAdapter,
  MetonaRequest,
  MetonaResponse,
  MetonaStreamEvent,
} from '../../types';
import { MetonaStreamEventType } from '../../types';

const userMessage = { role: 'user' as const, content: 'hello', timestamp: Date.now() };
const systemPrompt = { roleDefinition: '', outputConstraints: '', safetyGuidelines: '' };

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

function toolCallScript(name: string, args: Record<string, unknown>): MetonaStreamEvent[] {
  return [
    { type: MetonaStreamEventType.TOOL_CALL_COMPLETE, requestId: 'r', sessionId: 's1', iteration: 1, seq: 0, timestamp: Date.now(), toolCall: { id: 'tc_1', name, args, iteration: 1, timestamp: Date.now() } },
    { type: MetonaStreamEventType.DONE, requestId: 'r', sessionId: 's1', iteration: 1, seq: 1, timestamp: Date.now() },
  ];
}

function recordingAdapter(): {
  adapter: IMetonaProviderAdapter;
  requests: Array<MetonaRequest['messages']>;
} {
  let call = 0;
  const requests: Array<MetonaRequest['messages']> = [];
  const adapter: IMetonaProviderAdapter = {
    providerId: 'mock',
    supportedModels: ['m'],
    supportsToolCalling: true,
    supportsThinking: false,
    getContextWindow: () => 1_000_000,
    send: async (): Promise<MetonaResponse> => ({
      meta: { requestId: 'r_sum', provider: 'mock', model: 'm', latencyMs: 0, timestamp: Date.now() },
      content: 'SUMMARY-OF-EARLIER-TALK',
      usage: { inputTokens: 1, outputTokens: 1, totalTokens: 2 },
      finishReason: 'stop' as never,
    }),
    async *sendStream(request): AsyncIterable<MetonaStreamEvent> {
      const idx = call++;
      requests.push(request.messages);
      void idx;
      for (const ev of textDone('ok')) yield ev;
    },
    setAbortSignal: vi.fn(),
    healthCheck: async () => true,
  };
  return { adapter, requests };
}

describe('引擎 — 上下文压缩管线', () => {
  it('估算超阈值触发 LLM 摘要：第二轮请求以 [Context Summary] 开头并携带占位 user', async () => {
    // contextWindow=1000, threshold=0.8 ⇒ 触发线 800 tokens
    // 6 条历史各约 300 tokens（1200 ASCII 字符 ≈ 300 tok）+ 本轮 assistant/tool
    const heavy = 'A'.repeat(1200);
    const history: import('../../types').MetonaMessage[] = [
      { role: 'user', content: heavy, timestamp: Date.now() },
      { role: 'assistant', content: heavy, timestamp: Date.now() },
      { role: 'user', content: heavy, timestamp: Date.now() },
      { role: 'assistant', content: heavy, timestamp: Date.now() },
      { role: 'user', content: heavy, timestamp: Date.now() },
      { role: 'assistant', content: heavy, timestamp: Date.now() },
    ];

    const base = recordingAdapter();
    // 迭代 1：发起一次 read_file 工具调用 → 进入压缩检查 → 迭代 2 收到压缩后的消息
    // 注意：#3 修复会让引擎在每次 run 开始时从 adapter 同步 contextWindow，
    // 因此小窗口必须声明在 adapter 上（而非仅引擎配置），才能在真实接线形态下生效。
    const adapter: IMetonaProviderAdapter = {
      ...base.adapter,
      getContextWindow: () => 1_000,
      sendStream: (() => {
        let n = 0;
        return async function* (request: MetonaRequest): AsyncIterable<MetonaStreamEvent> {
          base.requests.push(request.messages); // 记录每轮实际请求（含压缩后的形态）
          if (n === 0) {
            n++;
            for (const ev of toolCallScript('read_file', { path: 'a.txt' })) yield ev;
            return;
          }
          for (const ev of textDone('final answer after compression')) yield ev;
        };
      })(),
    };

    const engine = new AgentLoopEngine(
      { maxIterations: 5, contextWindow: 1_000, compressionThreshold: 0.8 },
      adapter,
    );
    const compressedEvents: Array<{ originalTokens: number; compressedTokens: number }> = [];
    engine.on('compressed', (e) =>
      compressedEvents.push(e as { originalTokens: number; compressedTokens: number }),
    );

    const output = await engine.runStream(userMessage, 's1', history, systemPrompt);
    expect(output.terminationReason).toBe(TerminationReason.COMPLETED);

    expect(compressedEvents).toHaveLength(1);
    expect(compressedEvents[0].originalTokens).toBeGreaterThan(compressedEvents[0].compressedTokens);

    // 第二轮请求首部：#30 assistant 角色 + 占位 user（防连续 assistant 触发部分 Provider 400）
    expect(base.requests.length).toBeGreaterThanOrEqual(2);
    const secondRound = base.requests[1]!;
    const firstMsg = secondRound[0] as { role: string; content?: string };
    expect(firstMsg.role).toBe('assistant');
    expect(String(firstMsg.content)).toContain('[Context Summary]');
    expect(String(firstMsg.content)).toContain('SUMMARY-OF-EARLIER-TALK');
    const secondMsg = secondRound[1] as { role: string; content?: string };
    expect(secondMsg.role).toBe('user');
    expect(String(secondMsg.content)).toContain('[Continue from the summary above.]');
  });

  it('低占用时不触发压缩（负向回归）', async () => {
    const { adapter } = recordingAdapter();
    const engine = new AgentLoopEngine({ contextWindow: 1_000_000 }, adapter);
    const compressedEvents: unknown[] = [];
    engine.on('compressed', (e) => compressedEvents.push(e));
    await engine.runStream(userMessage, 's1', [{ role: 'user' as const, content: 'tiny', timestamp: Date.now() }], systemPrompt);
    expect(compressedEvents).toHaveLength(0);
  });
});

describe('引擎 — 指数退避重试（RETRY 伪事件端到端）', () => {
  it('503 ×2 后第三次成功；RETRY ERROR 与文本增量均正确分离', async () => {
    vi.useFakeTimers();
    try {
      let attempt = 0;
      const adapter: IMetonaProviderAdapter = {
        ...recordingAdapter().adapter,
        sendStream: async function* (): AsyncIterable<MetonaStreamEvent> {
          if (attempt < 2) {
            attempt++;
            throw Object.assign(new Error('upstream unavailable'), { status: 503 });
          }
          for (const ev of textDone('recovered')) yield ev;
        },
      };

      const streamEvents: string[] = [];
      const engine = new AgentLoopEngine({ retryCount: 3 }, adapter);
      engine.on('streamEvent', (ev: MetonaStreamEvent) => {
        if (ev.type === MetonaStreamEventType.ERROR && String(ev.error?.code ?? '').includes('retry')) return;
        streamEvents.push(ev.type);
      });

      const runPromise = engine.runStream(userMessage, 's1', [], systemPrompt);
      await vi.advanceTimersByTimeAsync(10_000); // 1s*2^0 + 2s*2^1 的 ±20% jitter 上限远小于此
      const output = await runPromise;

      expect(attempt).toBe(2);
      expect(output.terminationReason).toBe(TerminationReason.COMPLETED);
      expect(output.finalAnswer).toBe('recovered');
      expect(streamEvents.filter((t) => t === MetonaStreamEventType.TEXT_DELTA)).toHaveLength(1);
    } finally {
      vi.useRealTimers();
    }
  });
});

describe('引擎 — abort 竞速与 waitForAbort（#29 双路径）', () => {
  function hangRegistry(): { registry: unknown; resolveTool: (v: unknown) => void; calledRef: { v: boolean } } {
    let resolver!: (v: unknown) => void;
    const calledRef = { v: false };
    const registry = {
      get: () => ({ definition: { name: 'slow_tool', timeoutMs: 60_000 } }),
      execute: () => {
        calledRef.v = true;
        return new Promise((resolve) => {
          resolver = resolve;
        });
      },
    };
    // 注意：resolveTool 以闭包转发而非按值捕获 —— 调用方拿到时 resolver 可能尚未赋值
    return { registry, resolveTool: (v: unknown) => resolver(v), calledRef };
  }

  it('abort 在工具执行中触发竞速 → USER_INTERRUPT；迟到的工具结果不再转发', async () => {
    const { registry, resolveTool, calledRef } = hangRegistry();
    const hangBase = recordingAdapter();
    const toolAdapter: IMetonaProviderAdapter = {
      ...hangBase.adapter,
      sendStream: async function* (): AsyncIterable<MetonaStreamEvent> {
        for (const ev of toolCallScript('slow_tool', {})) yield ev;
      },
    };
    const engine = new AgentLoopEngine(
      { maxIterations: 3 },
      toolAdapter,
      registry as never,
      [], [],
    );
    const toolResults: unknown[] = [];
    engine.on('streamEvent', (ev: MetonaStreamEvent) => {
      if (ev.type === MetonaStreamEventType.TOOL_RESULT) toolResults.push(ev.toolResult);
    });

    const runPromise = engine.runStream(userMessage, 's1', [], systemPrompt);
    // 确定性等待：registry.execute 已被调用（工具挂起、resolver 已捕获）
    await vi.waitFor(() => expect(calledRef.v).toBe(true));
    engine.abort();
    resolveTool({ ok: true }); // 中止后才 settle —— 结果必须被丢弃而非转发
    const output = await runPromise;

    expect(output.terminationReason).toBe(TerminationReason.USER_INTERRUPT);
    expect(toolResults).toHaveLength(0);
  });

  it('run 正常结束后 waitForAbort 返回 true；挂起中超时返回 false', async () => {
    let release!: (v: void) => void;
    const gate = new Promise<void>((r) => (release = r));
    const { adapter } = recordingAdapter();
    const slowAdapter: IMetonaProviderAdapter = {
      ...adapter,
      sendStream: async function* (): AsyncIterable<MetonaStreamEvent> {
        await gate;
        for (const ev of textDone('late but done')) yield ev;
      },
    };
    const engine = new AgentLoopEngine({}, slowAdapter);

    const runPromise = engine.runStream(userMessage, 's1', [], systemPrompt);
    await new Promise((r) => setTimeout(r, 5));
    await expect(engine.waitForAbort(30)).resolves.toBe(false); // 挂起中：超时 false

    release();
    const output = await runPromise;
    expect(output.terminationReason).toBe(TerminationReason.COMPLETED);
    await expect(engine.waitForAbort(1_000)).resolves.toBe(true);
  });

  it('无进行中 run 时 waitForAbort 直接 true', async () => {
    const { adapter } = recordingAdapter();
    const engine = new AgentLoopEngine({}, adapter);
    await expect(engine.waitForAbort()).resolves.toBe(true);
  });
});

describe('引擎 — H-5 MEMORY.md 根文件闸门（参数别名矩阵 + 子目录放行）', () => {
  const workspacePath = process.platform === 'win32' ? 'C:\\ws\\demo' : '/ws/demo';

  function makeGuardedToolRunner(args: Record<string, unknown>): Promise<{ blockedError: string | null; executed: boolean }> {
    let executed = false;
    const registry = {
      get: () => ({ definition: { name: 'read_file', timeoutMs: 1_000 } }),
      execute: () => {
        executed = true;
        return Promise.resolve({ data: 'should-not-run' });
      },
    };
    const base = recordingAdapter();
    const adapter: IMetonaProviderAdapter = {
      ...base.adapter,
      sendStream: async function* (): AsyncIterable<MetonaStreamEvent> {
        yield { type: MetonaStreamEventType.TOOL_CALL_COMPLETE, requestId: 'r', sessionId: 's1', iteration: 1, seq: 0, timestamp: Date.now(), toolCall: { id: 'tc_g', name: 'read_file', args, iteration: 1, timestamp: Date.now() } } as MetonaStreamEvent;
        yield { type: MetonaStreamEventType.DONE, requestId: 'r', sessionId: 's1', iteration: 1, seq: 1, timestamp: Date.now() } as MetonaStreamEvent;
      },
    };
    const engine = new AgentLoopEngine({ maxIterations: 2 }, adapter, registry as never, [], []);
    engine.setWorkspacePath(workspacePath);

    return engine.runStream(userMessage, 's1', [], systemPrompt).then((output) => {
      const errText = String(output.iterations[0]?.toolResults?.[0]?.error ?? '');
      return {
        blockedError: errText.includes('protected by security policy') ? errText : null,
        executed,
      };
    });
  }

  it.each([
    ['path 别名命中根 MEMORY.md', { path: `${workspacePath}/MEMORY.md` }],
    ['file_path 别名（反斜杠）命中', { file_path: `${workspacePath}\\MEMORY.md` }],
    ['filePath 别名（混合斜杠）命中', { filePath: `${workspacePath}/MEMORY.md` }],
    ['file 别名命中', { file: `${workspacePath}/MEMORY.md` }],
    ['target 别名命中', { target: `${workspacePath}/MEMORY.md` }],
  ])('%s → 拦截且工具未执行', async (_label, args) => {
    const { blockedError, executed } = await makeGuardedToolRunner(args);
    expect(blockedError).toContain('protected by security policy');
    expect(executed).toBe(false);
  });

  it('子目录 MEMORY.md 放行（H-5 的精确保护语义核心）', async () => {
    const { blockedError, executed } = await makeGuardedToolRunner({ path: `${workspacePath}/docs/MEMORY.md` });
    expect(blockedError).toBeNull();
    expect(executed).toBe(true);
  });

  it('普通文件放行', async () => {
    const { blockedError, executed } = await makeGuardedToolRunner({ path: `${workspacePath}/a.txt` });
    expect(blockedError).toBeNull();
    expect(executed).toBe(true);
  });
});

describe('引擎 — finalizeToolCallsFromBuffer 兜底缓冲', () => {
  it('仅 DELTA 无 COMPLETE：合法 JSON 组装出 step.toolCalls', async () => {
    const { adapter } = recordingAdapter();
    const deltaAdapter: IMetonaProviderAdapter = {
      ...adapter,
      sendStream: async function* (): AsyncIterable<MetonaStreamEvent> {
        yield { type: MetonaStreamEventType.TOOL_CALL_DELTA, requestId: 'r', sessionId: 's1', iteration: 1, seq: 0, timestamp: Date.now(), toolCallDelta: { index: 0, name: 'write_file', argsDelta: '{"pa' } } as MetonaStreamEvent;
        yield { type: MetonaStreamEventType.TOOL_CALL_DELTA, requestId: 'r', sessionId: 's1', iteration: 1, seq: 1, timestamp: Date.now(), toolCallDelta: { index: 0, argsDelta: 'th":"a.txt"}' } } as MetonaStreamEvent;
        yield { type: MetonaStreamEventType.DONE, requestId: 'r', sessionId: 's1', iteration: 1, seq: 2, timestamp: Date.now() } as MetonaStreamEvent;
      },
    };
    const engine = new AgentLoopEngine({ maxIterations: 1 }, deltaAdapter);
    const output = await engine.runStream(userMessage, 's1', [], systemPrompt);
    const tcs = output.iterations[0]?.toolCalls ?? [];
    expect(tcs).toHaveLength(1);
    expect(tcs[0].name).toBe('write_file');
    expect(tcs[0].args).toEqual({ path: 'a.txt' });
  });

  it('仅 DELTA 且 JSON 半截：自愈载荷进入兜底解析（引擎侧最后防线）', async () => {
    const { adapter } = recordingAdapter();
    const deltaAdapter: IMetonaProviderAdapter = {
      ...adapter,
      sendStream: async function* (): AsyncIterable<MetonaStreamEvent> {
        yield { type: MetonaStreamEventType.TOOL_CALL_DELTA, requestId: 'r', sessionId: 's1', iteration: 1, seq: 0, timestamp: Date.now(), toolCallDelta: { index: 0, name: 'write_file', argsDelta: '{"content": "AAAA' } } as MetonaStreamEvent;
        yield { type: MetonaStreamEventType.DONE, requestId: 'r', sessionId: 's1', iteration: 1, seq: 1, timestamp: Date.now() } as MetonaStreamEvent;
      },
    };
    const engine = new AgentLoopEngine({ maxIterations: 1 }, deltaAdapter);
    const output = await engine.runStream(userMessage, 's1', [], systemPrompt);
    const args = (output.iterations[0]?.toolCalls?.[0]?.args ?? {}) as Record<string, unknown>;
    expect(args._truncatedArguments).toBe(true);
    expect(String(args._truncatedReason)).toContain('truncated');
  });
});