Save current state (unmerged, broken, not working...)

[vchess.git] / models / Problem.js

diff --git a/models/Problem.js b/models/Problem.js
new file mode 100644 (file)
index 0000000..0c80090
--- /dev/null
+++ b/models/Problem.js
@@ -0,0 +1,72 @@
+var db = require("../utils/database");
+
+/*
+ * Structure:
+ *   _id: problem number (int)
+ *   uid: user id (int)
+ *   vid: variant id (int)
+ *   added: timestamp
+ *   instructions: text
+ *   solution: text
+ */
+
+exports.create = function(vname, fen, instructions, solution)
+{
+       db.serialize(function() {
+               db.get("SELECT id FROM Variants WHERE name = '" + vname + "'", (err,variant) => {
+                       db.run(
+                               "INSERT INTO Problems (added, vid, fen, instructions, solution) VALUES " +
+                               "(" +
+                                       Date.now() + "," +
+                                       variant._id + "," +
+                                       fen + "," +
+                                       instructions + "," +
+                                       solution +
+                               ")");
+               });
+       });
+}
+
+exports.getById = function(id, callback)
+{
+       db.serialize(function() {
+               db.get(
+                       "SELECT * FROM Problems " +
+                       "WHERE id ='" + id + "'",
+                       callback);
+       });
+}
+
+exports.fetchN = function(vname, directionStr, lastDt, MaxNbProblems, callback)
+{
+       db.serialize(function() {
+               db.all(
+                       "SELECT * FROM Problems " +
+                       "WHERE vid = (SELECT id FROM Variants WHERE name = '" + vname + "') " +
+                       "  AND added " + directionStr + " " + lastDt + " " +
+                       "ORDER BY added " + (directionStr=="<" ? "DESC " : "") +
+                       "LIMIT " + MaxNbProblems,
+                       callback);
+       });
+}
+
+exports.update = function(id, uid, fen, instructions, solution)
+{
+       db.serialize(function() {
+               db.run(
+                       "UPDATE Problems " +
+                               "fen = " + fen + ", " +
+                               "instructions = " + instructions + ", " +
+                               "solution = " + solution + " " +
+                       "WHERE id = " + id + " AND uid = " + uid);
+       });
+}
+
+exports.remove = function(id, uid)
+{
+       db.serialize(function() {
+               db.run(
+                       "DELETE FROM Problems " +
+                       "WHERE id = " + id + " AND uid = " + uid);
+       });
+}