Separate client and server codes. Keep everything in one git repo for simplicity

[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..a1f9903
--- /dev/null
+++ b/server/models/Problem.js
@@ -0,0 +1,81 @@
+var db = require("../utils/database");
+
+/*
+ * Structure:
+ *   id: problem number (int)
+ *   uid: user id (int)
+ *   vid: variant id (int)
+ *   added: timestamp
+ *   instructions: text
+ *   solution: text
+ */
+
+const ProblemModel =
+{
+       create: function(uid, vid, fen, instructions, solution, cb)
+       {
+               db.serialize(function() {
+                       const insertQuery =
+                               "INSERT INTO Problems (added, uid, vid, fen, instructions, solution) " +
+                               "VALUES (" + Date.now() + "," + uid + "," + vid + ",'" + fen + "',?,?)";
+                       db.run(insertQuery, [instructions, solution], err => {
+                               if (!!err)
+                                       return cb(err);
+                               db.get("SELECT last_insert_rowid() AS rowid", cb);
+                       });
+               });
+       },
+
+       getOne: function(id, callback)
+       {
+               db.serialize(function() {
+                       const query =
+                               "SELECT * " +
+                               "FROM Problems " +
+                               "WHERE id = " + id;
+                       db.get(query, callback);
+               });
+       },
+
+       fetchN: function(vid, uid, type, directionStr, lastDt, MaxNbProblems, callback)
+       {
+               db.serialize(function() {
+                       let typeLine = "";
+                       if (uid > 0)
+                               typeLine = "AND uid " + (type=="others" ? "!=" : "=") + " " + uid;
+                       const query =
+                               "SELECT * FROM Problems " +
+                               "WHERE vid = " + vid +
+                               "  AND added " + directionStr + " " + lastDt + " " + typeLine + " " +
+                               "ORDER BY added " + (directionStr=="<" ? "DESC " : "") +
+                               "LIMIT " + MaxNbProblems;
+                       db.all(query, callback);
+               });
+       },
+
+       // TODO: update fails (but insert is OK)
+       update: function(id, uid, fen, instructions, solution, cb)
+       {
+               db.serialize(function() {
+                       const query =
+                               "UPDATE Problems SET " +
+                                       "fen = '" + fen + "', " +
+                                       "instructions = ?, " +
+                                       "solution = ? " +
+                               "WHERE id = " + id + " AND uid = " + uid;
+                       db.run(query, [instructions,solution], cb);
+               });
+       },
+
+       remove: function(id, uid)
+       {
+               db.serialize(function() {
+                       const query =
+                               "DELETE FROM Problems " +
+                               "WHERE id = " + id + " AND uid = " + uid;
+                       db.run(query);
+               });
+       },
+}
+
+module.exports = ProblemModel;