/*
 *  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 Article = syzoj.model('article');
let ArticleComment = syzoj.model('article-comment');
let User = syzoj.model('user');

app.get('/discussion', async (req, res) => {
  try {
    let paginate = syzoj.utils.paginate(await Article.count(), req.query.page, syzoj.config.page.discussion);
    let articles = await Article.query(paginate, null, [['public_time', 'desc']]);

    for (let article of articles) await article.loadRelationships();

    res.render('discussion', {
      articles: articles,
      paginate: paginate
    });
  } catch (e) {
    syzoj.log(e);
    res.render('error', {
      err: e
    });
  }
});

app.get('/article/:id', async (req, res) => {
  try {
    let id = parseInt(req.params.id);
    let article = await Article.fromID(id);
    if (!article) throw 'No such article';

    await article.loadRelationships();
    article.allowedEdit = await article.isAllowedEditBy(res.locals.user);
    article.allowedComment = await article.isAllowedCommentBy(res.locals.user);
    article.content = await syzoj.utils.markdown(article.content);

    let where = { article_id: id };

    let paginate = syzoj.utils.paginate(await ArticleComment.count(where), req.query.page, syzoj.config.page.article_comment);

    let comments = await ArticleComment.query(paginate, where, [['public_time', 'asc']]);

    for (let comment of comments) {
      comment.content = await syzoj.utils.markdown(comment.content);
      comment.allowedEdit = await comment.isAllowedEditBy(res.locals.user);
      await comment.loadRelationships();
    }

    res.render('article', {
      article: article,
      comments: comments,
      paginate: paginate
    });
  } catch (e) {
    syzoj.log(e);
    res.render('error', {
      err: e
    });
  }
});

app.get('/article/:id/edit', async (req, res) => {
  try {
    if (!res.locals.user) throw 'Please login.';

    let id = parseInt(req.params.id);
    let article = await Article.fromID(id);

    if (!article) {
      article = await Article.create();
      article.id = 0;
      article.allowedEdit = true;
    } else {
      article.allowedEdit = await article.isAllowedEditBy(res.locals.user);
    }

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

app.post('/article/:id/edit', async (req, res) => {
  try {
    if (!res.locals.user) throw 'Please login.';

    let id = parseInt(req.params.id);
    let article = await Article.fromID(id);

    let time = syzoj.utils.getCurrentDate();
    if (!article) {
      article = await Article.create();
      article.user_id = res.locals.user.id;
      article.public_time = article.sort_time = time;
    } else {
      if (!await article.isAllowedEditBy(res.locals.user)) throw 'Permission denied.';
    }

    article.title = req.body.title;
    article.content = req.body.content;
    article.update_time = time;

    await article.save();

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

app.get('/article/:id/delete', async (req, res) => {
  try {
    if (!res.locals.user) throw 'Please login.';

    let id = parseInt(req.params.id);
    let article = await Article.fromID(id);

    if (!article) {
      throw 'No such article.';
    } else {
      if (!await article.isAllowedEditBy(res.locals.user)) throw 'Permission denied.';
    }

    await article.destroy();

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

app.post('/article/:id/comment', async (req, res) => {
  try {
    if (!res.locals.user) throw 'Please login.';

    let id = parseInt(req.params.id);
    let article = await Article.fromID(id);

    if (!article) {
      throw 'No such article.';
    } else {
      if (!await article.isAllowedCommentBy(res.locals.user)) throw 'Permission denied.';
    }

    let comment = await ArticleComment.create({
      content: req.body.comment,
      article_id: id,
      user_id: res.locals.user.id,
      public_time: syzoj.utils.getCurrentDate()
    });

    await comment.save();

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

app.get('/article/:article_id/comment/:id/delete', async (req, res) => {
  try {
    if (!res.locals.user) throw 'Please login.';

    let id = parseInt(req.params.id);
    let comment = await ArticleComment.fromID(id);

    if (!comment) {
      throw 'No such comment.';
    } else {
      if (!await comment.isAllowedEditBy(res.locals.user)) throw 'Permission denied.';
    }

    await comment.destroy();

    res.redirect(syzoj.utils.makeUrl(['article', comment.article_id]));
  } catch (e) {
    syzoj.log(e);
    res.render('error', {
      err: e
    });
  }
});