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

const router = express.Router();

router.get('/', authenticate, async (req, res) => {
  const { group_name, server_name, sort } = req.query;
  let orderClause = 'ORDER BY fi.created_at DESC';
  if (sort === 'votes') orderClause = 'ORDER BY votes_count DESC, fi.created_at DESC';

  const items = await query(`SELECT fi.*,
    (SELECT COUNT(*) FROM feature_votes WHERE item_id = fi.id) as votes_count,
    (SELECT COUNT(*) FROM feature_votes WHERE item_id = fi.id AND user_id = ?) as my_vote
    FROM feature_items fi
    WHERE (fi.group_name = ? OR ? = '') AND (fi.server_name = ? OR ? = '')
    ${orderClause}`, [req.user.id, group_name||'', group_name||'', server_name||'', server_name||'']);
  res.json(items);
});

router.post('/', authenticate, requireRole('owner'), async (req, res) => {
  const { title, description, group_name, server_name } = req.body;
  if (!title) return res.status(400).json({ error: '标题为必填' });
  await query('INSERT INTO feature_items(title, description, group_name, server_name) VALUES (?,?,?,?)', [title, description||'', group_name||'', server_name||'']);
  res.status(201).json({ id: 0 });
});

router.put('/:id', authenticate, requireRole('owner'), async (req, res) => {
  const fields = {};
  if (req.body.title) fields.title = req.body.title;
  if (req.body.description !== undefined) fields.description = req.body.description;
  if (req.body.status) fields.status = req.body.status;
  if (req.body.group_name) fields.group_name = req.body.group_name;
  if (req.body.server_name) fields.server_name = req.body.server_name;
  if (!Object.keys(fields).length) return res.status(400).json({ error: '无更新内容' });
  const sets = Object.keys(fields).map(k => `${k} = ?`).join(', ');
  await query(`UPDATE feature_items SET ${sets} WHERE id = ?`, [...Object.values(fields), req.params.id]);
  res.json({ message: '更新成功' });
});

router.delete('/:id', authenticate, requireRole('owner'), async (req, res) => {
  await query('DELETE FROM feature_votes WHERE item_id = ?', [req.params.id]);
  await query('DELETE FROM feature_items WHERE id = ?', [req.params.id]);
  res.json({ message: '已删除' });
});

router.post('/:id/vote', authenticate, async (req, res) => {
  const item = await getRow('SELECT id FROM feature_items WHERE id = ?', [req.params.id]);
  if (!item) return res.status(404).json({ error: '不存在' });
  const voted = await getRow('SELECT id FROM feature_votes WHERE item_id = ? AND user_id = ?', [item.id, req.user.id]);
  if (voted) {
    await query('DELETE FROM feature_votes WHERE item_id = ? AND user_id = ?', [item.id, req.user.id]);
    return res.json({ message: '已取消投票' });
  }
  await query('INSERT INTO feature_votes(item_id, user_id) VALUES (?,?)', [item.id, req.user.id]);
  res.json({ message: '投票成功' });
});

module.exports = router;