Add delete problem

models/problem.js

@@ -638,6 +638,36 @@ class Problem extends Model {
     await this.save();
   }
 
+  async delete() {
+    let fs = Promise.promisifyAll(require('fs-extra'));
+    let oldTestdataDir = this.getTestdataPath(), oldTestdataZip = oldTestdataDir + '.zip';
+    await fs.removeAsync(oldTestdataDir);
+    await fs.removeAsync(oldTestdataZip);
+
+    let JudgeState = syzoj.model('judge_state');
+    let submissions = await JudgeState.query(null, { problem_id: this.id }), submitCnt = {}, acUsers = new Set();
+    for (let sm of submissions) {
+      if (sm.status === 'Accepted') acUsers.add(sm.user_id);
+      if (!submitCnt[sm.user_id]) {
+        submitCnt[sm.user_id] = 1;
+      } else {
+        submitCnt[sm.user_id]++;
+      }
+    }
+
+    for (let u in submitCnt) {
+      let user = await User.fromID(u);
+      user.submit_num -= submitCnt[u];
+      if (acUsers.has(parseInt(u))) user.ac_num--;
+      await user.save();
+    }
+
+    await db.query('DELETE FROM `problem`         WHERE `id`         = ' + this.id);
+    await db.query('DELETE FROM `judge_state`     WHERE `problem_id` = ' + this.id);
+    await db.query('DELETE FROM `problem_tag_map` WHERE `problem_id` = ' + this.id);
+    await db.query('DELETE FROM `article`         WHERE `problem_id` = ' + this.id);
+  }
+
   getModel() { return model; }
 }
 

modules/problem.js

@@ -652,6 +652,25 @@ app.post('/problem/:id/submit', app.multer.fields([{ name: 'answer', maxCount: 1
   }
 });
 
+app.post('/problem/:id/delete', async (req, res) => {
+  try {
+    let id = parseInt(req.params.id);
+    let problem = await Problem.fromID(id);
+    if (!problem) throw new ErrorMessage('无此题目。');
+
+    if (!problem.isAllowedManageBy(res.locals.user)) throw new ErrorMessage('您没有权限进行此操作。');
+
+    await problem.delete();
+
+    res.redirect(syzoj.utils.makeUrl(['problem']));
+  } catch (e) {
+    syzoj.log(e);
+    res.render('error', {
+      err: e
+    });
+  }
+});
+
 app.get('/problem/:id/testdata', async (req, res) => {
   try {
     let id = parseInt(req.params.id);

views/problem.ejs

@@ -116,6 +116,28 @@ div[class*=ace_br] {
             <% } else { %>
               <a class="small ui button" id="public" href-post="<%= syzoj.utils.makeUrl(['problem', problem.id, 'public']) %>">公开</a>
             <% } %>
+            <div class="ui basic modal" id="modal-delete">
+              <div class="ui icon header">
+                <i class="trash icon"></i>
+                <p style="margin-top: 15px; ">删除题目</p>
+              </div>
+              <div class="content" style="text-align: center; ">
+                <p>确认删除此题目吗？提交记录、讨论以及测试数据将一并删除。<br>
+                删除题目导致的修改用户提交、通过数量可能会耗费一些时间。</p>
+                <b>警告：删除比赛中的题目会导致系统错乱！请确认没有比赛使用此题目。</b>
+              </div>
+              <div class="actions">
+                <div class="ui red basic cancel inverted button">
+                  <i class="remove icon"></i>
+                  否
+                </div>
+                <a class="ui green ok inverted button" href-post="<%= syzoj.utils.makeUrl(['problem', problem.id, 'delete']) %>">
+                  <i class="checkmark icon"></i>
+                  是
+                </a>
+              </div>
+            </div>
+            <div class="small ui red button" onclick="$('#modal-delete').modal('show')">删除</div>
           <% } %>
         </div>
       <% } %>