/*
 *  This file is part of SYZOJ.
 *
 *  Copyright (c) 2016 Menci <huanghaorui301@gmail.com>
 *
 *  SYZOJ is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as
 *  published by the Free Software Foundation, either version 3 of the
 *  License, or (at your option) any later version.
 *
 *  SYZOJ is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public
 *  License along with SYZOJ. If not, see <http://www.gnu.org/licenses/>.
 */

'use strict';

let ProblemTag = syzoj.model('problem_tag');

app.get('/problems/tag/:id/edit', async (req, res) => {
  try {
    if (!res.locals.user && !res.locals.user.is_admin) throw new ErrorMessage('您没有权限进行此操作。');

    let id = parseInt(req.params.id) || 0;
    let tag = await ProblemTag.fromID(id);

    if (!tag) {
      tag = await ProblemTag.create();
      tag.id = id;
    }

    res.render('problem_tag_edit', {
      tag: tag
    });
  } catch (e) {
    syzoj.log(e);
    res.render('error', {
      err: e
    });
  }
});

app.post('/problems/tag/:id/edit', async (req, res) => {
  try {
    if (!res.locals.user || !res.locals.user.is_admin) throw new ErrorMessage('您没有权限进行此操作。');

    let id = parseInt(req.params.id) || 0;
    let tag = await ProblemTag.fromID(id);

    if (!tag) {
      tag = await ProblemTag.create();
      tag.id = id;
    }

    req.body.name = req.body.name.trim();
    if (tag.name !== req.body.name) {
      if (await ProblemTag.findOne({ where: { name: req.body.name } })) {
        throw new ErrorMessage('标签名称已被使用。');
      }
    }

    tag.name = req.body.name;
    tag.color = req.body.color;

    await tag.save();

    res.redirect(syzoj.utils.makeUrl(['problems', 'tag', tag.id]));
  } catch (e) {
    syzoj.log(e);
    res.render('error', {
      err: e
    });
  }
});