const express = require('express');
const { query, getRow } = require('../db');
const { authenticate, requireRole } = require('../middleware/auth');
const { logSystem } = require('../logger');

const router = express.Router();

// ---- 来源列表(公开: 注册页/绑定身份页需要) ----
router.get('/', async (req, res) => {
  try {
    const rows = await query('SELECT code, label, sort_order FROM sources WHERE enabled = 1 ORDER BY sort_order, id');
    res.json(rows);
  } catch (e) { res.status(500).json({ error: e.message }); }
});

// ---- 管理(owner) ----
router.post('/', authenticate, requireRole('owner'), async (req, res) => {
  try {
    const { code, label, sort_order } = req.body;
    if (!code || !label) return res.status(400).json({ error: 'code 和 label 必填' });
    if (!/^[a-z0-9_]{1,20}$/.test(code)) return res.status(400).json({ error: 'code 仅允许小写字母数字下划线(≤20)' });
    const dup = await getRow('SELECT id FROM sources WHERE code = ?', [code]);
    if (dup) return res.status(400).json({ error: '该来源已存在' });
    const r = await query('INSERT INTO sources(code, label, sort_order) VALUES (?,?,?)', [code, label, parseInt(sort_order) || 0]);
    await logSystem('info', 'source', `新增来源: ${code}(${label})`);
    res.status(201).json({ id: r.insertId, message: '已添加' });
  } catch (e) { res.status(500).json({ error: e.message }); }
});

router.put('/:code', authenticate, requireRole('owner'), async (req, res) => {
  try {
    const { label, enabled, sort_order } = req.body;
    const row = await getRow('SELECT id FROM sources WHERE code = ?', [req.params.code]);
    if (!row) return res.status(404).json({ error: '来源不存在' });
    await query('UPDATE sources SET label = ?, enabled = ?, sort_order = ? WHERE code = ?',
      [label || req.params.code, enabled ? 1 : 0, parseInt(sort_order) || 0, req.params.code]);
    await logSystem('info', 'source', `更新来源: ${req.params.code}`, { label, enabled: !!enabled });
    res.json({ message: '已更新' });
  } catch (e) { res.status(500).json({ error: e.message }); }
});

router.delete('/:code', authenticate, requireRole('owner'), async (req, res) => {
  try {
    // 有关联数据时禁止删除(防误删)
    const usedUsers = await getRow('SELECT COUNT(*) as c FROM users WHERE source = ?', [req.params.code]);
    const usedIdent = await getRow('SELECT COUNT(*) as c FROM user_identities WHERE source = ?', [req.params.code]);
    if (usedUsers.c > 0 || usedIdent.c > 0) return res.status(400).json({ error: `该来源已被 ${usedUsers.c + usedIdent.c} 条身份数据使用, 请先停用` });
    await query('DELETE FROM sources WHERE code = ?', [req.params.code]);
    await logSystem('info', 'source', `删除来源: ${req.params.code}`);
    res.json({ message: '已删除' });
  } catch (e) { res.status(500).json({ error: e.message }); }
});

module.exports = router;