#!/usr/bin/env node
/**
 * 逃生舱状态管理 (Phase 0)
 *
 * 管理 /force, /checks, /reset 用户覆盖。
 *
 * 状态文件: debug/user-overrides.json
 * 自动过期: 1 小时（匹配 session-memory.js MAX_SESSION_AGE）
 * /force: 单次生效（compliance-gate 放行后自动清除）
 * /checks off: 会话级（手动 /checks on 或 /reset 或过期后恢复）
 */

const fs = require('fs');
const path = require('path');

// 路径解析
let overridesPath, debugDir;
try {
  const { PATHS } = require('./paths.config.js');
  overridesPath = PATHS.userOverridesJson;
  debugDir = PATHS.debugDir;
} catch {
  const root = path.resolve(__dirname, '..');
  debugDir = path.join(root, 'debug');
  overridesPath = path.join(debugDir, 'user-overrides.json');
}

const MAX_AGE_MS = 60 * 60 * 1000; // 1 小时

// ─── 内部辅助 ─────────────────────────────────────────

function ensureDir() {
  try {
    if (!fs.existsSync(debugDir)) fs.mkdirSync(debugDir, { recursive: true });
  } catch {}
}

/**
 * 读取覆盖状态（检查过期）
 * @returns {Object} overrides 状态
 */
function readState() {
  try {
    if (!fs.existsSync(overridesPath)) return null;
    const raw = fs.readFileSync(overridesPath, 'utf8');
    const state = JSON.parse(raw);

    // 检查过期
    if (state.expiresAt && new Date(state.expiresAt).getTime() < Date.now()) {
      // 过期 → 清除文件
      try { fs.unlinkSync(overridesPath); } catch {}
      return null;
    }

    return state;
  } catch {
    return null;
  }
}

/**
 * 写入覆盖状态
 * @param {Object} overrides - { force, checksOff, forceSkill }
 */
function writeState(overrides) {
  ensureDir();
  const now = new Date();
  const state = {
    createdAt: now.toISOString(),
    expiresAt: new Date(now.getTime() + MAX_AGE_MS).toISOString(),
    overrides: {
      force: overrides.force || false,
      checksOff: overrides.checksOff || false,
      forceSkill: overrides.forceSkill || null,
    },
  };
  fs.writeFileSync(overridesPath, JSON.stringify(state, null, 2) + '\n');
}

// ─── 公开 API ─────────────────────────────────────────

/**
 * 设置 force 模式（单次生效）
 * @param {string} [skillName] - 可选指定技能
 */
function setForce(skillName) {
  const current = readState();
  const overrides = current ? current.overrides : { force: false, checksOff: false, forceSkill: null };
  overrides.force = true;
  overrides.forceSkill = skillName || null;
  writeState(overrides);
}

/**
 * 设置 checks 开关
 * @param {boolean} enabled - true=开启检查, false=关闭检查
 */
function setChecks(enabled) {
  const current = readState();
  const overrides = current ? current.overrides : { force: false, checksOff: false, forceSkill: null };
  overrides.checksOff = !enabled;
  writeState(overrides);
}

/**
 * 重置所有覆盖
 */
function resetAll() {
  try {
    if (fs.existsSync(overridesPath)) fs.unlinkSync(overridesPath);
  } catch {}
}

/**
 * 检查 force 是否激活
 * @returns {{ active: boolean, skill?: string }}
 */
function isForceActive() {
  const state = readState();
  if (!state || !state.overrides || !state.overrides.force) {
    return { active: false };
  }
  return { active: true, skill: state.overrides.forceSkill || undefined };
}

/**
 * 检查 checks 是否被关闭
 * @returns {boolean}
 */
function isChecksDisabled() {
  const state = readState();
  if (!state || !state.overrides) return false;
  return state.overrides.checksOff === true;
}

/**
 * 清除 force 标志（compliance-gate 放行后调用）
 */
function clearForce() {
  const state = readState();
  if (!state || !state.overrides) return;
  state.overrides.force = false;
  state.overrides.forceSkill = null;
  writeState(state.overrides);
}

// ─── 导出 ─────────────────────────────────────────────
module.exports = {
  setForce,
  setChecks,
  resetAll,
  isForceActive,
  isChecksDisabled,
  clearForce,
};

// CLI: 直接运行时打印当前状态
if (require.main === module) {
  const state = readState();
  console.log('=== User Overrides ===');
  console.log(`Path: ${overridesPath}`);
  if (!state) {
    console.log('Status: No active overrides');
  } else {
    console.log(`Created: ${state.createdAt}`);
    console.log(`Expires: ${state.expiresAt}`);
    console.log(`Force: ${state.overrides.force ? 'ON' + (state.overrides.forceSkill ? ` (${state.overrides.forceSkill})` : '') : 'OFF'}`);
    console.log(`Checks: ${state.overrides.checksOff ? 'DISABLED' : 'ENABLED'}`);
  }
}