/**
 * 记忆固化触发决策测试（v0.7.3 P1-5）
 *
 * 锁定 shouldConsolidate 的四类判定：总开关 / 内容门控（回答长度 ∨ 成功工具调用）/
 * 频率窗口（含首次不限）/ 配置兜底（非法数值回退安全下限）。
 */

import { describe, it, expect } from 'vitest';
import {
  shouldConsolidate,
  MIN_CONSOLIDATION_INTERVAL_MS,
  MIN_CONSOLIDATION_MIN_CHARS,
} from '../consolidation-policy';

const BASE = {
  enabled: true,
  answerChars: 500,
  minChars: 200,
  hadSuccessfulToolCall: false,
  lastConsolidationAt: 0,
  now: 1_000_000,
  intervalMs: 600_000,
};

describe('shouldConsolidate', () => {
  it('总开关显式关闭 → disabled', () => {
    expect(shouldConsolidate({ ...BASE, enabled: false })).toEqual({
      consolidate: false,
      reason: 'disabled',
    });
  });

  it('回答够长且首次固化 → 允许（lastConsolidationAt=0 不受频率限制）', () => {
    expect(shouldConsolidate(BASE)).toEqual({
      consolidate: true,
      reason: 'content-and-frequency-pass',
    });
  });

  it('回答过短且无成功工具调用 → below-threshold（短寒暄不触发固化）', () => {
    expect(shouldConsolidate({ ...BASE, answerChars: 50, hadSuccessfulToolCall: false })).toEqual({
      consolidate: false,
      reason: 'below-threshold',
    });
  });

  it('回答过短但存在成功工具调用 → 允许（事实性上下文可沉淀）', () => {
    expect(shouldConsolidate({ ...BASE, answerChars: 50, hadSuccessfulToolCall: true })).toEqual({
      consolidate: true,
      reason: 'content-and-frequency-pass',
    });
  });

  it('频率窗口内重复触发 → throttled', () => {
    expect(
      shouldConsolidate({
        ...BASE,
        lastConsolidationAt: BASE.now - 60_000, // 1 分钟前刚固化过
      }),
    ).toEqual({ consolidate: false, reason: 'throttled' });
  });

  it('频率窗口已过 → 允许', () => {
    expect(
      shouldConsolidate({
        ...BASE,
        lastConsolidationAt: BASE.now - 600_001,
      }),
    ).toEqual({ consolidate: true, reason: 'content-and-frequency-pass' });
  });

  it('配置兜底：minChars=0 不会让纯寒暄触发（安全下限生效）', () => {
    expect(shouldConsolidate({ ...BASE, minChars: 0, answerChars: 10 })).toEqual({
      consolidate: false,
      reason: 'below-threshold',
    });
    expect(MIN_CONSOLIDATION_MIN_CHARS).toBeGreaterThan(0);
  });

  it('配置兜底：intervalMs=0 不会退化为每条消息固化（安全下限生效）', () => {
    expect(
      shouldConsolidate({
        ...BASE,
        intervalMs: 0,
        lastConsolidationAt: BASE.now - 30_000, // 30 秒前刚固化
      }),
    ).toEqual({ consolidate: false, reason: 'throttled' });
    expect(MIN_CONSOLIDATION_INTERVAL_MS).toBeGreaterThanOrEqual(60_000);
  });

  it('配置兜底：minChars/intervalMs 为 NaN 时按默认值处理', () => {
    expect(shouldConsolidate({ ...BASE, minChars: Number.NaN, intervalMs: Number.NaN })).toEqual({
      consolidate: true,
      reason: 'content-and-frequency-pass',
    });
  });
});