Draft of problems section

[vchess.git] / server / models / Problem.js

diff --git a/server/models/Problem.js b/server/models/Problem.js
new file mode 100644 (file)
index 0000000..75c2e14
--- /dev/null
+++ b/server/models/Problem.js
@@ -0,0 +1,106 @@
+var db = require("../utils/database");
+
+/*
+ * Structure:
+ *   id: integer
+ *   added: datetime
+ *   uid: user id (int)
+ *   vid: variant id (int)
+ *   fen: varchar (optional)
+ *   instruction: text
+ *   solution: text
+ */
+
+const ProblemModel =
+{
+  checkProblem: function(p)
+  {
+    if (!p.vid.toString().match(/^[0-9]+$/))
+      return "Wrong variant ID";
+    if (!p.fen.match(/^[a-zA-Z0-9, /-]*$/))
+      return "Bad FEN string";
+    return "";
+  },
+
+  create: function(p, cb)
+  {
+    db.serialize(function() {
+      const query =
+        "INSERT INTO Problems " +
+        "(added, uid, vid, fen, instruction, solution) " +
+          "VALUES " +
+        "(" + Date.now() + "," + p.uid + ",'" + p.fen  + "',?,?)";
+      db.run(query, p.instruction, p.solution, function(err) {
+        return cb(err, {pid: this.lastID});
+      });
+    });
+  },
+
+  getAll: function(cb)
+  {
+    db.serialize(function() {
+      const query =
+        "SELECT * " +
+        "FROM Problems";
+      db.all(query, (err,problems) => {
+        return cb(err, problems);
+      });
+    });
+  },
+
+  getOne: function(id, cb)
+  {
+    db.serialize(function() {
+      const query =
+        "SELECT * " +
+        "FROM Problems " +
+        "WHERE id = " + id;
+      db.get(query, (err,problem) => {
+        return cb(err, problem);
+      });
+    });
+  },
+
+  update: function(id, prob)
+  {
+    db.serialize(function() {
+      let query =
+        "UPDATE Problems " +
+        "SET " +
+          "vid = " + prob.vid + "," +
+          "fen = " + prob.fen + "," +
+          "instruction = " + prob.instruction + "," +
+          "solution = " + prob.solution + " " +
+        "WHERE id = " + id;
+      db.run(query);
+    });
+  },
+
+  remove: function(id)
+  {
+    db.serialize(function() {
+      const query =
+        "DELETE FROM Problems " +
+        "WHERE id = " + id;
+      db.run(query);
+    });
+  },
+
+  safeRemove: function(id, uid, cb)
+  {
+    db.serialize(function() {
+      const query =
+        "SELECT 1 " +
+        "FROM Problems " +
+        "WHERE id = " + id + " AND uid = " + uid;
+      db.get(query, (err,prob) => {
+        if (!prob)
+          return cb({errmsg: "Not your problem"});
+        ProvlemModel.remove(id);
+        cb(null);
+      });
+    });
+  },
+}
+
+module.exports = ProblemModel;