'use strict';

const express = require('express');
const { ACTIONS } = require('@profile/shared');
const audit = require('./audit');
const db = require('../infra/db');
const rbac = require('../rbac/rbac');
const { requireAuth } = require('../auth/auth');
const { ok, asyncHandler } = require('../common/http');

const router = express.Router();

function sanitizeMcpArgs(value) {
  if (Array.isArray(value)) return value.map(sanitizeMcpArgs);
  if (!value || typeof value !== 'object') return value;
  const out = {};
  for (const [key, item] of Object.entries(value)) {
    // 只过滤凭证类字段,保留业务参数(employeeId/name/year/team 等)供审计追踪
    if (/(password|secret|token|_enc|_hmac)/i.test(key)) continue;
    out[key] = sanitizeMcpArgs(item);
  }
  return out;
}

/**
 * 生成人类可读的 MCP 调用摘要(供审计日志"结果摘要"列显示)
 */
function formatMcpSummary(tool, args) {
  if (!args || typeof args !== 'object') return '';
  const parts = [];
  if (args.keyword) parts.push(`关键词:${args.keyword}`);
  if (args.employeeId) parts.push(`工号:${args.employeeId}`);
  if (args.employeeName) parts.push(`姓名:${args.employeeName}`);
  if (args.year) parts.push(`年份:${args.year}`);
  if (args.month) parts.push(`月份:${args.month}`);
  if (args.team) parts.push(`班组:${args.team}`);
  if (args.modules && Array.isArray(args.modules)) parts.push(`模块:${args.modules.join(',')}`);
  if (args.openUi === false) parts.push('不开窗');
  return parts.join('、') || JSON.stringify(args).slice(0, 200);
}

router.post(
  '/view',
  requireAuth,
  asyncHandler(async (req, res) => {
    const { page, table, filters, rowCount } = req.body || {};
    const safePage = typeof page === 'string' && /^[a-z0-9_-]{1,64}$/.test(page) ? page : null;
    const safeTable = typeof table === 'string' && /^[a-z0-9_]{1,64}$/.test(table) ? table : null;
    if (!safePage && !safeTable) {
      const err = new Error('页面或数据表标识无效');
      err.status = 400;
      throw err;
    }
    await audit.log({
      userId: req.user.id,
      username: req.user.username,
      roleCode: req.user.roles?.[0],
      clientType: 'ui',
      action: safeTable ? 'view_data' : 'view_page',
      module: safePage || safeTable,
      targetType: safeTable ? 'table' : 'page',
      targetId: safeTable || safePage,
      payload: safeTable
        ? { filters: sanitizeMcpArgs(filters || {}), rowCount: Math.max(0, Number(rowCount) || 0) }
        : null,
      ip: req.ip,
      userAgent: req.headers['user-agent'],
    });
    ok(res, { recorded: true });
  }),
);

router.post(
  '/mcp',
  requireAuth,
  asyncHandler(async (req, res) => {
    const { tool, args, success, durationMs, error } = req.body || {};
    if (typeof tool !== 'string' || !/^profile_(query|get|list|health)_[a-z0-9_]+$/.test(tool)) {
      const err = new Error('非法 MCP 工具名');
      err.status = 400;
      throw err;
    }
    await audit.log({
      userId: req.user.id,
      username: req.user.username,
      roleCode: req.user.roles?.[0],
      clientType: 'agent',
      action: 'mcp_call',
      module: 'mcp',
      targetType: 'tool',
      targetId: tool,
      payload: {
        summary: formatMcpSummary(tool, args),
        args: sanitizeMcpArgs(args || {}),
        success: Boolean(success),
        durationMs: Math.max(0, Number(durationMs) || 0),
        error: error ? String(error).slice(0, 500) : null,
      },
      ip: req.ip,
      userAgent: req.headers['user-agent'],
    });
    ok(res, { recorded: true });
  }),
);

router.get(
  '/',
  requireAuth,
  rbac.requirePermission('audit', ACTIONS.READ),
  asyncHandler(async (req, res) => {
    const take = Math.min(Number(req.query.size) || 50, 200);
    const page = Math.max(Number(req.query.page) || 1, 1);
    const offset = (page - 1) * take;

    const conds = [];
    const params = [];
    if (req.query.client_type) {
      conds.push('a.client_type = ?');
      params.push(req.query.client_type);
    }
    if (req.query.action) {
      conds.push('a.action = ?');
      params.push(req.query.action);
    }
    if (req.query.username) {
      const keyword = `%${String(req.query.username).slice(0, 64)}%`;
      conds.push('(a.username LIKE ? OR u.real_name LIKE ? OR u.display_name LIKE ?)');
      params.push(keyword, keyword, keyword);
    }
    if (req.query.module) {
      conds.push('a.module = ?');
      params.push(String(req.query.module).slice(0, 64));
    }
    const where = conds.length ? `WHERE ${conds.join(' AND ')}` : '';

    const rows = await db.query(
      `SELECT a.*, u.display_name, u.real_name
         FROM audit_logs a
         LEFT JOIN users u ON u.id = a.user_id AND u.deleted_at IS NULL
         ${where}
         ORDER BY a.id DESC
         LIMIT ${take} OFFSET ${offset}`,
      params,
    );
    const countRows = await db.query(
      `SELECT COUNT(*) AS total
         FROM audit_logs a
         LEFT JOIN users u ON u.id = a.user_id AND u.deleted_at IS NULL
         ${where}`,
      params,
    );
    ok(res, { rows, total: Number(countRows[0].total), page, size: take });
  }),
);

router.get(
  '/verify',
  requireAuth,
  rbac.requirePermission('audit', ACTIONS.READ),
  asyncHandler(async (req, res) => {
    ok(res, await audit.verifyChain());
  }),
);

module.exports = router;