'use strict';
// 環境檢查：start 前確認 AI CLI（codex / claude 至少一個）、pm2、git 等工具是否就緒。
const { execSync } = require('child_process');
const fs = require('fs');
const os = require('os');
const path = require('path');

function tryExec(cmd) {
  try {
    return execSync(cmd, { encoding: 'utf-8', windowsHide: true, stdio: ['ignore', 'pipe', 'ignore'], timeout: 15000 }).trim();
  } catch {
    return null;
  }
}

function codexVersion() {
  return tryExec('codex --version');
}

function claudeVersion() {
  const { resolveClaudeCommand } = require('./engines/claude');
  const { cmd } = resolveClaudeCommand({});
  const out = tryExec(`"${cmd}" --version`) || tryExec('claude --version');
  return out ? out.split('\n')[0] : null;
}

function claudeLoggedIn() {
  if (fs.existsSync(path.join(os.homedir(), '.claude', '.credentials.json'))) return true;
  try {
    const j = JSON.parse(fs.readFileSync(path.join(os.homedir(), '.claude.json'), 'utf-8'));
    return !!j.oauthAccount;
  } catch {
    return false;
  }
}

// 回傳 [{ name, ok, required, message }]
function runChecks() {
  const checks = [];

  const nodeMajor = Number(process.versions.node.split('.')[0]);
  checks.push({
    name: 'Node.js',
    ok: nodeMajor >= 18,
    required: true,
    message: nodeMajor >= 18 ? process.version : `${process.version}（需要 ≥ 18）`,
  });

  const codexVer = codexVersion();
  checks.push({
    name: 'Codex CLI',
    ok: !!codexVer,
    required: false,
    group: 'engine',
    message: codexVer || '找不到 codex（要用 Codex 引擎才需要）：npm install -g @openai/codex',
  });
  if (codexVer) {
    const loggedIn = fs.existsSync(path.join(os.homedir(), '.codex', 'auth.json'));
    checks.push({
      name: 'Codex 登入',
      ok: loggedIn,
      required: false,
      message: loggedIn ? '已登入' : '尚未登入，請先執行：codex login（Codex bot 啟動後才需要）',
    });
  }

  const claudeVer = claudeVersion();
  checks.push({
    name: 'Claude Code CLI',
    ok: !!claudeVer,
    required: false,
    group: 'engine',
    message: claudeVer || '找不到 claude（要用 Claude 引擎才需要）：npm install -g @anthropic-ai/claude-code',
  });
  if (claudeVer) {
    const loggedIn = claudeLoggedIn();
    checks.push({
      name: 'Claude 登入',
      ok: loggedIn,
      required: false,
      message: loggedIn ? '已登入' : '尚未登入，請先執行：claude（首次啟動會引導登入）',
    });
  }

  if (!codexVer && !claudeVer) {
    checks.push({
      name: 'AI 引擎',
      ok: false,
      required: true,
      message: 'codex 與 claude 都找不到，至少要裝一個',
    });
  }

  const pm2Ver = tryExec('pm2 -v');
  checks.push({
    name: 'pm2',
    ok: !!pm2Ver,
    required: true,
    message: pm2Ver ? `v${pm2Ver.split('\n').pop()}` : '找不到 pm2，請安裝：npm install -g pm2',
  });

  const gitVer = tryExec('git --version');
  checks.push({
    name: 'git',
    ok: !!gitVer,
    required: false,
    message: gitVer || '找不到 git（非必要：AI 要做版控操作時會需要）',
  });

  return checks;
}

function printChecks(checks) {
  for (const c of checks) {
    const icon = c.ok ? '✅' : c.required ? '❌' : '⚠️';
    console.log(`${icon} ${c.name}：${c.message}`);
  }
}

function hasBlocker(checks) {
  return checks.some((c) => c.required && !c.ok);
}

module.exports = { runChecks, printChecks, hasBlocker, codexVersion, claudeVersion };