const fs = require('fs');
const path = require('path');
const { latestPath } = require('./output-paths');
const { buildClaudeSessionName } = require('./agent-runtime');

const PACKAGE_ROOT = path.resolve(__dirname, '..', '..', '..');

function sessionCommandPrefix() {
  const pluginsDir = path.dirname(PACKAGE_ROOT);
  const claudeDir = path.dirname(pluginsDir);
  if (path.basename(pluginsDir) === 'plugins' && path.basename(claudeDir) === '.claude') {
    return `npm --prefix ".claude/plugins/${path.basename(PACKAGE_ROOT)}" run`;
  }
  return 'npm run';
}

function safeCustomerArgument(value) {
  return String(value || '企微客户')
    .replace(/[^\p{L}\p{N} _.-]/gu, '')
    .trim()
    .slice(0, 60) || '企微客户';
}

function readSessionState(filePath = latestPath('messages', 'claude-code-sessions.json')) {
  try {
    const parsed = JSON.parse(fs.readFileSync(filePath, 'utf8'));
    parsed.sessions ||= {};
    parsed.project ||= {};
    return parsed;
  } catch {
    return { version: 1, project: {}, sessions: {} };
  }
}

function getCustomerSessionGuide(conversation = {}, options = {}) {
  const conversationId = String(conversation.id || conversation.conversationId || '');
  const customerName = String(conversation.contact_name || conversation.displayName || '企微客户').trim();
  const state = options.state || readSessionState(options.sessionFile);
  const session = state.sessions?.[conversationId] || null;
  const displayName = session?.displayName || buildClaudeSessionName({
    conversation: { contact_name: customerName },
  }, conversationId || customerName);
  const safeName = safeCustomerArgument(customerName);
  return {
    detected: Boolean(session),
    ready: Boolean(session?.initialized),
    status: !session ? 'not_created' : session.initialized ? 'ready' : 'waiting_first_run',
    customerName,
    displayName,
    openLocation: 'Fmode Studio → 当前企微项目 → 终端',
    openCommand: `${sessionCommandPrefix()} agent:session -- --customer "${safeName}"`,
    openMode: 'forked-review',
    productionSessionProtected: true,
    guidance: session?.initialized
      ? '已检测到客户专属 Claude Code Session。运行打开命令后会 fork 审阅副本，可查看完整历史、模型思考和工具记录。'
      : session
        ? '客户专属 Session 已分配，首次生成草稿后即可打开完整 Claude Code 对话。'
        : '该客户尚未创建 Claude Code Session；首次运行 Agent 后系统会自动创建并显示打开方式。',
    updatedAt: session?.updatedAt || session?.createdAt || null,
  };
}

module.exports = {
  safeCustomerArgument,
  sessionCommandPrefix,
  readSessionState,
  getCustomerSessionGuide,
};